(Fcolor_supported_p): Just one arg is required.
[emacs.git] / src / process.c
blobc12dda174f38531e5f1784351c8f5871f4c839d1
1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 98, 1999,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #define _GNU_SOURCE /* to get strsignal declared with glibc 2 */
24 #include <config.h>
25 #include <signal.h>
27 /* This file is split into two parts by the following preprocessor
28 conditional. The 'then' clause contains all of the support for
29 asynchronous subprocesses. The 'else' clause contains stub
30 versions of some of the asynchronous subprocess routines that are
31 often called elsewhere in Emacs, so we don't have to #ifdef the
32 sections that call them. */
35 #ifdef subprocesses
37 #include <stdio.h>
38 #include <errno.h>
39 #include <setjmp.h>
40 #include <sys/types.h> /* some typedefs are used in sys/file.h */
41 #include <sys/file.h>
42 #include <sys/stat.h>
43 #ifdef HAVE_UNISTD_H
44 #include <unistd.h>
45 #endif
47 #if defined(WINDOWSNT) || defined(UNIX98_PTYS)
48 #include <stdlib.h>
49 #include <fcntl.h>
50 #endif /* not WINDOWSNT */
52 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
53 #include <sys/socket.h>
54 #include <netdb.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
57 #ifdef NEED_NET_ERRNO_H
58 #include <net/errno.h>
59 #endif /* NEED_NET_ERRNO_H */
61 /* Are local (unix) sockets supported? */
62 #if defined (HAVE_SYS_UN_H) && !defined (NO_SOCKETS_IN_FILE_SYSTEM)
63 #if !defined (AF_LOCAL) && defined (AF_UNIX)
64 #define AF_LOCAL AF_UNIX
65 #endif
66 #ifdef AF_LOCAL
67 #define HAVE_LOCAL_SOCKETS
68 #include <sys/un.h>
69 #endif
70 #endif
71 #endif /* HAVE_SOCKETS */
73 /* TERM is a poor-man's SLIP, used on GNU/Linux. */
74 #ifdef TERM
75 #include <client.h>
76 #endif
78 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
79 #ifdef HAVE_BROKEN_INET_ADDR
80 #define IN_ADDR struct in_addr
81 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
82 #else
83 #define IN_ADDR unsigned long
84 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
85 #endif
87 #if defined(BSD_SYSTEM) || defined(STRIDE)
88 #include <sys/ioctl.h>
89 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
90 #include <fcntl.h>
91 #endif /* HAVE_PTYS and no O_NDELAY */
92 #endif /* BSD_SYSTEM || STRIDE */
94 #ifdef BROKEN_O_NONBLOCK
95 #undef O_NONBLOCK
96 #endif /* BROKEN_O_NONBLOCK */
98 #ifdef NEED_BSDTTY
99 #include <bsdtty.h>
100 #endif
102 #ifdef IRIS
103 #include <sys/sysmacros.h> /* for "minor" */
104 #endif /* not IRIS */
106 #include "systime.h"
107 #include "systty.h"
109 #include "lisp.h"
110 #include "window.h"
111 #include "buffer.h"
112 #include "charset.h"
113 #include "coding.h"
114 #include "process.h"
115 #include "termhooks.h"
116 #include "termopts.h"
117 #include "commands.h"
118 #include "keyboard.h"
119 #include "frame.h"
120 #include "blockinput.h"
121 #include "dispextern.h"
122 #include "composite.h"
123 #include "atimer.h"
125 Lisp_Object Qprocessp;
126 Lisp_Object Qrun, Qstop, Qsignal;
127 Lisp_Object Qopen, Qclosed, Qconnect, Qfailed, Qlisten;
128 Lisp_Object Qlocal, Qdatagram;
129 Lisp_Object QCname, QCbuffer, QChost, QCservice, QCtype;
130 Lisp_Object QClocal, QCremote, QCcoding;
131 Lisp_Object QCserver, QCnowait, QCnoquery, QCstop;
132 Lisp_Object QCsentinel, QClog, QCoptions;
133 Lisp_Object Qlast_nonmenu_event;
134 /* QCfamily is declared and initialized in xfaces.c,
135 QCfilter in keyboard.c. */
136 extern Lisp_Object QCfamily, QCfilter;
138 /* Qexit is declared and initialized in eval.c. */
140 /* QCfamily is defined in xfaces.c. */
141 extern Lisp_Object QCfamily;
142 /* QCfilter is defined in keyboard.c. */
143 extern Lisp_Object QCfilter;
145 /* a process object is a network connection when its childp field is neither
146 Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */
148 #ifdef HAVE_SOCKETS
149 #define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
150 #define NETCONN1_P(p) (GC_CONSP ((p)->childp))
151 #else
152 #define NETCONN_P(p) 0
153 #define NETCONN1_P(p) 0
154 #endif /* HAVE_SOCKETS */
156 /* Define first descriptor number available for subprocesses. */
157 #ifdef VMS
158 #define FIRST_PROC_DESC 1
159 #else /* Not VMS */
160 #define FIRST_PROC_DESC 3
161 #endif
163 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
164 testing SIGCHLD. */
166 #if !defined (SIGCHLD) && defined (SIGCLD)
167 #define SIGCHLD SIGCLD
168 #endif /* SIGCLD */
170 #include "syssignal.h"
172 #include "syswait.h"
174 extern void set_waiting_for_input P_ ((EMACS_TIME *));
176 #ifndef USE_CRT_DLL
177 extern int errno;
178 #endif
179 #ifdef VMS
180 extern char *sys_errlist[];
181 #endif
183 #ifndef HAVE_H_ERRNO
184 extern int h_errno;
185 #endif
187 /* t means use pty, nil means use a pipe,
188 maybe other values to come. */
189 static Lisp_Object Vprocess_connection_type;
191 #ifdef SKTPAIR
192 #ifndef HAVE_SOCKETS
193 #include <sys/socket.h>
194 #endif
195 #endif /* SKTPAIR */
197 /* These next two vars are non-static since sysdep.c uses them in the
198 emulation of `select'. */
199 /* Number of events of change of status of a process. */
200 int process_tick;
201 /* Number of events for which the user or sentinel has been notified. */
202 int update_tick;
204 /* Define NON_BLOCKING_CONNECT if we can support non-blocking connects. */
206 #ifdef BROKEN_NON_BLOCKING_CONNECT
207 #undef NON_BLOCKING_CONNECT
208 #else
209 #ifndef NON_BLOCKING_CONNECT
210 #ifdef HAVE_SOCKETS
211 #ifdef HAVE_SELECT
212 #if defined (HAVE_GETPEERNAME) || defined (GNU_LINUX)
213 #if defined (O_NONBLOCK) || defined (O_NDELAY)
214 #if defined (EWOULDBLOCK) || defined (EINPROGRESS)
215 #define NON_BLOCKING_CONNECT
216 #endif /* EWOULDBLOCK || EINPROGRESS */
217 #endif /* O_NONBLOCK || O_NDELAY */
218 #endif /* HAVE_GETPEERNAME || GNU_LINUX */
219 #endif /* HAVE_SELECT */
220 #endif /* HAVE_SOCKETS */
221 #endif /* NON_BLOCKING_CONNECT */
222 #endif /* BROKEN_NON_BLOCKING_CONNECT */
224 /* Define DATAGRAM_SOCKETS if datagrams can be used safely on
225 this system. We need to read full packets, so we need a
226 "non-destructive" select. So we require either native select,
227 or emulation of select using FIONREAD. */
229 #ifdef BROKEN_DATAGRAM_SOCKETS
230 #undef DATAGRAM_SOCKETS
231 #else
232 #ifndef DATAGRAM_SOCKETS
233 #ifdef HAVE_SOCKETS
234 #if defined (HAVE_SELECT) || defined (FIONREAD)
235 #if defined (HAVE_SENDTO) && defined (HAVE_RECVFROM) && defined (EMSGSIZE)
236 #define DATAGRAM_SOCKETS
237 #endif /* HAVE_SENDTO && HAVE_RECVFROM && EMSGSIZE */
238 #endif /* HAVE_SELECT || FIONREAD */
239 #endif /* HAVE_SOCKETS */
240 #endif /* DATAGRAM_SOCKETS */
241 #endif /* BROKEN_DATAGRAM_SOCKETS */
243 #ifdef TERM
244 #undef NON_BLOCKING_CONNECT
245 #undef DATAGRAM_SOCKETS
246 #endif
249 #include "sysselect.h"
251 extern int keyboard_bit_set P_ ((SELECT_TYPE *));
253 /* If we support a window system, turn on the code to poll periodically
254 to detect C-g. It isn't actually used when doing interrupt input. */
255 #ifdef HAVE_WINDOW_SYSTEM
256 #define POLL_FOR_INPUT
257 #endif
259 /* Mask of bits indicating the descriptors that we wait for input on. */
261 static SELECT_TYPE input_wait_mask;
263 /* Mask that excludes keyboard input descriptor (s). */
265 static SELECT_TYPE non_keyboard_wait_mask;
267 /* Mask that excludes process input descriptor (s). */
269 static SELECT_TYPE non_process_wait_mask;
271 /* Mask of bits indicating the descriptors that we wait for connect to
272 complete on. Once they complete, they are removed from this mask
273 and added to the input_wait_mask and non_keyboard_wait_mask. */
275 static SELECT_TYPE connect_wait_mask;
277 /* Number of bits set in connect_wait_mask. */
278 static int num_pending_connects;
280 /* The largest descriptor currently in use for a process object. */
281 static int max_process_desc;
283 /* The largest descriptor currently in use for keyboard input. */
284 static int max_keyboard_desc;
286 /* Nonzero means delete a process right away if it exits. */
287 static int delete_exited_processes;
289 /* Indexed by descriptor, gives the process (if any) for that descriptor */
290 Lisp_Object chan_process[MAXDESC];
292 /* Alist of elements (NAME . PROCESS) */
293 Lisp_Object Vprocess_alist;
295 /* Buffered-ahead input char from process, indexed by channel.
296 -1 means empty (no char is buffered).
297 Used on sys V where the only way to tell if there is any
298 output from the process is to read at least one char.
299 Always -1 on systems that support FIONREAD. */
301 /* Don't make static; need to access externally. */
302 int proc_buffered_char[MAXDESC];
304 /* Table of `struct coding-system' for each process. */
305 static struct coding_system *proc_decode_coding_system[MAXDESC];
306 static struct coding_system *proc_encode_coding_system[MAXDESC];
308 #ifdef DATAGRAM_SOCKETS
309 /* Table of `partner address' for datagram sockets. */
310 struct sockaddr_and_len {
311 struct sockaddr *sa;
312 int len;
313 } datagram_address[MAXDESC];
314 #define DATAGRAM_CHAN_P(chan) (datagram_address[chan].sa != 0)
315 #define DATAGRAM_CONN_P(proc) (PROCESSP (proc) && datagram_address[XINT (XPROCESS (proc)->infd)].sa != 0)
316 #else
317 #define DATAGRAM_CHAN_P(chan) (0)
318 #define DATAGRAM_CONN_P(proc) (0)
319 #endif
321 static Lisp_Object get_process ();
322 static void exec_sentinel ();
324 extern EMACS_TIME timer_check ();
325 extern int timers_run;
327 /* Maximum number of bytes to send to a pty without an eof. */
328 static int pty_max_bytes;
330 extern Lisp_Object Vfile_name_coding_system, Vdefault_file_name_coding_system;
332 #ifdef HAVE_PTYS
333 /* The file name of the pty opened by allocate_pty. */
335 static char pty_name[24];
336 #endif
338 /* Compute the Lisp form of the process status, p->status, from
339 the numeric status that was returned by `wait'. */
341 Lisp_Object status_convert ();
343 void
344 update_status (p)
345 struct Lisp_Process *p;
347 union { int i; WAITTYPE wt; } u;
348 u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16);
349 p->status = status_convert (u.wt);
350 p->raw_status_low = Qnil;
351 p->raw_status_high = Qnil;
354 /* Convert a process status word in Unix format to
355 the list that we use internally. */
357 Lisp_Object
358 status_convert (w)
359 WAITTYPE w;
361 if (WIFSTOPPED (w))
362 return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil));
363 else if (WIFEXITED (w))
364 return Fcons (Qexit, Fcons (make_number (WRETCODE (w)),
365 WCOREDUMP (w) ? Qt : Qnil));
366 else if (WIFSIGNALED (w))
367 return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)),
368 WCOREDUMP (w) ? Qt : Qnil));
369 else
370 return Qrun;
373 /* Given a status-list, extract the three pieces of information
374 and store them individually through the three pointers. */
376 void
377 decode_status (l, symbol, code, coredump)
378 Lisp_Object l;
379 Lisp_Object *symbol;
380 int *code;
381 int *coredump;
383 Lisp_Object tem;
385 if (SYMBOLP (l))
387 *symbol = l;
388 *code = 0;
389 *coredump = 0;
391 else
393 *symbol = XCAR (l);
394 tem = XCDR (l);
395 *code = XFASTINT (XCAR (tem));
396 tem = XCDR (tem);
397 *coredump = !NILP (tem);
401 /* Return a string describing a process status list. */
403 Lisp_Object
404 status_message (status)
405 Lisp_Object status;
407 Lisp_Object symbol;
408 int code, coredump;
409 Lisp_Object string, string2;
411 decode_status (status, &symbol, &code, &coredump);
413 if (EQ (symbol, Qsignal) || EQ (symbol, Qstop))
415 char *signame;
416 synchronize_system_messages_locale ();
417 signame = strsignal (code);
418 if (signame == 0)
419 signame = "unknown";
420 string = build_string (signame);
421 string2 = build_string (coredump ? " (core dumped)\n" : "\n");
422 SSET (string, 0, DOWNCASE (SREF (string, 0)));
423 return concat2 (string, string2);
425 else if (EQ (symbol, Qexit))
427 if (code == 0)
428 return build_string ("finished\n");
429 string = Fnumber_to_string (make_number (code));
430 string2 = build_string (coredump ? " (core dumped)\n" : "\n");
431 return concat3 (build_string ("exited abnormally with code "),
432 string, string2);
434 else if (EQ (symbol, Qfailed))
436 string = Fnumber_to_string (make_number (code));
437 string2 = build_string ("\n");
438 return concat3 (build_string ("failed with code "),
439 string, string2);
441 else
442 return Fcopy_sequence (Fsymbol_name (symbol));
445 #ifdef HAVE_PTYS
447 /* Open an available pty, returning a file descriptor.
448 Return -1 on failure.
449 The file name of the terminal corresponding to the pty
450 is left in the variable pty_name. */
453 allocate_pty ()
455 struct stat stb;
456 register int c, i;
457 int fd;
459 /* Some systems name their pseudoterminals so that there are gaps in
460 the usual sequence - for example, on HP9000/S700 systems, there
461 are no pseudoterminals with names ending in 'f'. So we wait for
462 three failures in a row before deciding that we've reached the
463 end of the ptys. */
464 int failed_count = 0;
466 #ifdef PTY_ITERATION
467 PTY_ITERATION
468 #else
469 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
470 for (i = 0; i < 16; i++)
471 #endif
473 #ifdef PTY_NAME_SPRINTF
474 PTY_NAME_SPRINTF
475 #else
476 sprintf (pty_name, "/dev/pty%c%x", c, i);
477 #endif /* no PTY_NAME_SPRINTF */
479 #ifdef PTY_OPEN
480 PTY_OPEN;
481 #else /* no PTY_OPEN */
482 #ifdef IRIS
483 /* Unusual IRIS code */
484 *ptyv = emacs_open ("/dev/ptc", O_RDWR | O_NDELAY, 0);
485 if (fd < 0)
486 return -1;
487 if (fstat (fd, &stb) < 0)
488 return -1;
489 #else /* not IRIS */
490 if (stat (pty_name, &stb) < 0)
492 failed_count++;
493 if (failed_count >= 3)
494 return -1;
496 else
497 failed_count = 0;
498 #ifdef O_NONBLOCK
499 fd = emacs_open (pty_name, O_RDWR | O_NONBLOCK, 0);
500 #else
501 fd = emacs_open (pty_name, O_RDWR | O_NDELAY, 0);
502 #endif
503 #endif /* not IRIS */
504 #endif /* no PTY_OPEN */
506 if (fd >= 0)
508 /* check to make certain that both sides are available
509 this avoids a nasty yet stupid bug in rlogins */
510 #ifdef PTY_TTY_NAME_SPRINTF
511 PTY_TTY_NAME_SPRINTF
512 #else
513 sprintf (pty_name, "/dev/tty%c%x", c, i);
514 #endif /* no PTY_TTY_NAME_SPRINTF */
515 #ifndef UNIPLUS
516 if (access (pty_name, 6) != 0)
518 emacs_close (fd);
519 #if !defined(IRIS) && !defined(__sgi)
520 continue;
521 #else
522 return -1;
523 #endif /* IRIS */
525 #endif /* not UNIPLUS */
526 setup_pty (fd);
527 return fd;
530 return -1;
532 #endif /* HAVE_PTYS */
534 Lisp_Object
535 make_process (name)
536 Lisp_Object name;
538 register Lisp_Object val, tem, name1;
539 register struct Lisp_Process *p;
540 char suffix[10];
541 register int i;
543 p = allocate_process ();
545 XSETINT (p->infd, -1);
546 XSETINT (p->outfd, -1);
547 XSETFASTINT (p->pid, 0);
548 XSETFASTINT (p->tick, 0);
549 XSETFASTINT (p->update_tick, 0);
550 p->raw_status_low = Qnil;
551 p->raw_status_high = Qnil;
552 p->status = Qrun;
553 p->mark = Fmake_marker ();
555 /* If name is already in use, modify it until it is unused. */
557 name1 = name;
558 for (i = 1; ; i++)
560 tem = Fget_process (name1);
561 if (NILP (tem)) break;
562 sprintf (suffix, "<%d>", i);
563 name1 = concat2 (name, build_string (suffix));
565 name = name1;
566 p->name = name;
567 XSETPROCESS (val, p);
568 Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist);
569 return val;
572 void
573 remove_process (proc)
574 register Lisp_Object proc;
576 register Lisp_Object pair;
578 pair = Frassq (proc, Vprocess_alist);
579 Vprocess_alist = Fdelq (pair, Vprocess_alist);
581 deactivate_process (proc);
584 DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0,
585 doc: /* Return t if OBJECT is a process. */)
586 (object)
587 Lisp_Object object;
589 return PROCESSP (object) ? Qt : Qnil;
592 DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0,
593 doc: /* Return the process named NAME, or nil if there is none. */)
594 (name)
595 register Lisp_Object name;
597 if (PROCESSP (name))
598 return name;
599 CHECK_STRING (name);
600 return Fcdr (Fassoc (name, Vprocess_alist));
603 DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
604 doc: /* Return the (or a) process associated with BUFFER.
605 BUFFER may be a buffer or the name of one. */)
606 (buffer)
607 register Lisp_Object buffer;
609 register Lisp_Object buf, tail, proc;
611 if (NILP (buffer)) return Qnil;
612 buf = Fget_buffer (buffer);
613 if (NILP (buf)) return Qnil;
615 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
617 proc = Fcdr (Fcar (tail));
618 if (PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf))
619 return proc;
621 return Qnil;
624 /* This is how commands for the user decode process arguments. It
625 accepts a process, a process name, a buffer, a buffer name, or nil.
626 Buffers denote the first process in the buffer, and nil denotes the
627 current buffer. */
629 static Lisp_Object
630 get_process (name)
631 register Lisp_Object name;
633 register Lisp_Object proc, obj;
634 if (STRINGP (name))
636 obj = Fget_process (name);
637 if (NILP (obj))
638 obj = Fget_buffer (name);
639 if (NILP (obj))
640 error ("Process %s does not exist", SDATA (name));
642 else if (NILP (name))
643 obj = Fcurrent_buffer ();
644 else
645 obj = name;
647 /* Now obj should be either a buffer object or a process object.
649 if (BUFFERP (obj))
651 proc = Fget_buffer_process (obj);
652 if (NILP (proc))
653 error ("Buffer %s has no process", SDATA (XBUFFER (obj)->name));
655 else
657 CHECK_PROCESS (obj);
658 proc = obj;
660 return proc;
663 DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0,
664 doc: /* Delete PROCESS: kill it and forget about it immediately.
665 PROCESS may be a process, a buffer, the name of a process or buffer, or
666 nil, indicating the current buffer's process. */)
667 (process)
668 register Lisp_Object process;
670 process = get_process (process);
671 XPROCESS (process)->raw_status_low = Qnil;
672 XPROCESS (process)->raw_status_high = Qnil;
673 if (NETCONN_P (process))
675 XPROCESS (process)->status = Fcons (Qexit, Fcons (make_number (0), Qnil));
676 XSETINT (XPROCESS (process)->tick, ++process_tick);
678 else if (XINT (XPROCESS (process)->infd) >= 0)
680 Fkill_process (process, Qnil);
681 /* Do this now, since remove_process will make sigchld_handler do nothing. */
682 XPROCESS (process)->status
683 = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil));
684 XSETINT (XPROCESS (process)->tick, ++process_tick);
685 status_notify ();
687 remove_process (process);
688 return Qnil;
691 DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0,
692 doc: /* Return the status of PROCESS.
693 The returned value is one of the following symbols:
694 run -- for a process that is running.
695 stop -- for a process stopped but continuable.
696 exit -- for a process that has exited.
697 signal -- for a process that has got a fatal signal.
698 open -- for a network stream connection that is open.
699 listen -- for a network stream server that is listening.
700 closed -- for a network stream connection that is closed.
701 connect -- when waiting for a non-blocking connection to complete.
702 failed -- when a non-blocking connection has failed.
703 nil -- if arg is a process name and no such process exists.
704 PROCESS may be a process, a buffer, the name of a process, or
705 nil, indicating the current buffer's process. */)
706 (process)
707 register Lisp_Object process;
709 register struct Lisp_Process *p;
710 register Lisp_Object status;
712 if (STRINGP (process))
713 process = Fget_process (process);
714 else
715 process = get_process (process);
717 if (NILP (process))
718 return process;
720 p = XPROCESS (process);
721 if (!NILP (p->raw_status_low))
722 update_status (p);
723 status = p->status;
724 if (CONSP (status))
725 status = XCAR (status);
726 if (NETCONN1_P (p))
728 if (EQ (status, Qexit))
729 status = Qclosed;
730 else if (EQ (p->command, Qt))
731 status = Qstop;
732 else if (EQ (status, Qrun))
733 status = Qopen;
735 return status;
738 DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status,
739 1, 1, 0,
740 doc: /* Return the exit status of PROCESS or the signal number that killed it.
741 If PROCESS has not yet exited or died, return 0. */)
742 (process)
743 register Lisp_Object process;
745 CHECK_PROCESS (process);
746 if (!NILP (XPROCESS (process)->raw_status_low))
747 update_status (XPROCESS (process));
748 if (CONSP (XPROCESS (process)->status))
749 return XCAR (XCDR (XPROCESS (process)->status));
750 return make_number (0);
753 DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0,
754 doc: /* Return the process id of PROCESS.
755 This is the pid of the Unix process which PROCESS uses or talks to.
756 For a network connection, this value is nil. */)
757 (process)
758 register Lisp_Object process;
760 CHECK_PROCESS (process);
761 return XPROCESS (process)->pid;
764 DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0,
765 doc: /* Return the name of PROCESS, as a string.
766 This is the name of the program invoked in PROCESS,
767 possibly modified to make it unique among process names. */)
768 (process)
769 register Lisp_Object process;
771 CHECK_PROCESS (process);
772 return XPROCESS (process)->name;
775 DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0,
776 doc: /* Return the command that was executed to start PROCESS.
777 This is a list of strings, the first string being the program executed
778 and the rest of the strings being the arguments given to it.
779 For a non-child channel, this is nil. */)
780 (process)
781 register Lisp_Object process;
783 CHECK_PROCESS (process);
784 return XPROCESS (process)->command;
787 DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0,
788 doc: /* Return the name of the terminal PROCESS uses, or nil if none.
789 This is the terminal that the process itself reads and writes on,
790 not the name of the pty that Emacs uses to talk with that terminal. */)
791 (process)
792 register Lisp_Object process;
794 CHECK_PROCESS (process);
795 return XPROCESS (process)->tty_name;
798 DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer,
799 2, 2, 0,
800 doc: /* Set buffer associated with PROCESS to BUFFER (a buffer, or nil). */)
801 (process, buffer)
802 register Lisp_Object process, buffer;
804 struct Lisp_Process *p;
806 CHECK_PROCESS (process);
807 if (!NILP (buffer))
808 CHECK_BUFFER (buffer);
809 p = XPROCESS (process);
810 p->buffer = buffer;
811 if (NETCONN1_P (p))
812 p->childp = Fplist_put (p->childp, QCbuffer, buffer);
813 return buffer;
816 DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer,
817 1, 1, 0,
818 doc: /* Return the buffer PROCESS is associated with.
819 Output from PROCESS is inserted in this buffer unless PROCESS has a filter. */)
820 (process)
821 register Lisp_Object process;
823 CHECK_PROCESS (process);
824 return XPROCESS (process)->buffer;
827 DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
828 1, 1, 0,
829 doc: /* Return the marker for the end of the last output from PROCESS. */)
830 (process)
831 register Lisp_Object process;
833 CHECK_PROCESS (process);
834 return XPROCESS (process)->mark;
837 DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter,
838 2, 2, 0,
839 doc: /* Give PROCESS the filter function FILTER; nil means no filter.
840 t means stop accepting output from the process.
841 When a process has a filter, each time it does output
842 the entire string of output is passed to the filter.
843 The filter gets two arguments: the process and the string of output.
844 If the process has a filter, its buffer is not used for output. */)
845 (process, filter)
846 register Lisp_Object process, filter;
848 struct Lisp_Process *p;
850 CHECK_PROCESS (process);
851 p = XPROCESS (process);
853 /* Don't signal an error if the process' input file descriptor
854 is closed. This could make debugging Lisp more difficult,
855 for example when doing something like
857 (setq process (start-process ...))
858 (debug)
859 (set-process-filter process ...) */
861 if (XINT (p->infd) >= 0)
863 if (EQ (filter, Qt) && !EQ (p->status, Qlisten))
865 FD_CLR (XINT (p->infd), &input_wait_mask);
866 FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
868 else if (EQ (p->filter, Qt)
869 && !EQ (p->command, Qt)) /* Network process not stopped. */
871 FD_SET (XINT (p->infd), &input_wait_mask);
872 FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
876 p->filter = filter;
877 if (NETCONN1_P (p))
878 p->childp = Fplist_put (p->childp, QCfilter, filter);
879 return filter;
882 DEFUN ("process-filter", Fprocess_filter, Sprocess_filter,
883 1, 1, 0,
884 doc: /* Returns the filter function of PROCESS; nil if none.
885 See `set-process-filter' for more info on filter functions. */)
886 (process)
887 register Lisp_Object process;
889 CHECK_PROCESS (process);
890 return XPROCESS (process)->filter;
893 DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel,
894 2, 2, 0,
895 doc: /* Give PROCESS the sentinel SENTINEL; nil for none.
896 The sentinel is called as a function when the process changes state.
897 It gets two arguments: the process, and a string describing the change. */)
898 (process, sentinel)
899 register Lisp_Object process, sentinel;
901 CHECK_PROCESS (process);
902 XPROCESS (process)->sentinel = sentinel;
903 return sentinel;
906 DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel,
907 1, 1, 0,
908 doc: /* Return the sentinel of PROCESS; nil if none.
909 See `set-process-sentinel' for more info on sentinels. */)
910 (process)
911 register Lisp_Object process;
913 CHECK_PROCESS (process);
914 return XPROCESS (process)->sentinel;
917 DEFUN ("set-process-window-size", Fset_process_window_size,
918 Sset_process_window_size, 3, 3, 0,
919 doc: /* Tell PROCESS that it has logical window size HEIGHT and WIDTH. */)
920 (process, height, width)
921 register Lisp_Object process, height, width;
923 CHECK_PROCESS (process);
924 CHECK_NATNUM (height);
925 CHECK_NATNUM (width);
927 if (XINT (XPROCESS (process)->infd) < 0
928 || set_window_size (XINT (XPROCESS (process)->infd),
929 XINT (height), XINT (width)) <= 0)
930 return Qnil;
931 else
932 return Qt;
935 DEFUN ("set-process-inherit-coding-system-flag",
936 Fset_process_inherit_coding_system_flag,
937 Sset_process_inherit_coding_system_flag, 2, 2, 0,
938 doc: /* Determine whether buffer of PROCESS will inherit coding-system.
939 If the second argument FLAG is non-nil, then the variable
940 `buffer-file-coding-system' of the buffer associated with PROCESS
941 will be bound to the value of the coding system used to decode
942 the process output.
944 This is useful when the coding system specified for the process buffer
945 leaves either the character code conversion or the end-of-line conversion
946 unspecified, or if the coding system used to decode the process output
947 is more appropriate for saving the process buffer.
949 Binding the variable `inherit-process-coding-system' to non-nil before
950 starting the process is an alternative way of setting the inherit flag
951 for the process which will run. */)
952 (process, flag)
953 register Lisp_Object process, flag;
955 CHECK_PROCESS (process);
956 XPROCESS (process)->inherit_coding_system_flag = flag;
957 return flag;
960 DEFUN ("process-inherit-coding-system-flag",
961 Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
962 1, 1, 0,
963 doc: /* Return the value of inherit-coding-system flag for PROCESS.
964 If this flag is t, `buffer-file-coding-system' of the buffer
965 associated with PROCESS will inherit the coding system used to decode
966 the process output. */)
967 (process)
968 register Lisp_Object process;
970 CHECK_PROCESS (process);
971 return XPROCESS (process)->inherit_coding_system_flag;
974 DEFUN ("set-process-query-on-exit-flag",
975 Fset_process_query_on_exit_flag, Sset_process_query_on_exit_flag,
976 2, 2, 0,
977 doc: /* Specify if query is needed for PROCESS when Emacs is exited.
978 If the second argument FLAG is non-nil, emacs will query the user before
979 exiting if PROCESS is running. */)
980 (process, flag)
981 register Lisp_Object process, flag;
983 CHECK_PROCESS (process);
984 XPROCESS (process)->kill_without_query = Fnull (flag);
985 return flag;
988 DEFUN ("process-query-on-exit-flag",
989 Fprocess_query_on_exit_flag, Sprocess_query_on_exit_flag,
990 1, 1, 0,
991 doc: /* Return the current value of query on exit flag for PROCESS. */)
992 (process)
993 register Lisp_Object process;
995 CHECK_PROCESS (process);
996 return Fnull (XPROCESS (process)->kill_without_query);
999 #ifdef DATAGRAM_SOCKETS
1000 Lisp_Object Fprocess_datagram_address ();
1001 #endif
1003 DEFUN ("process-contact", Fprocess_contact, Sprocess_contact,
1004 1, 2, 0,
1005 doc: /* Return the contact info of PROCESS; t for a real child.
1006 For a net connection, the value depends on the optional KEY arg.
1007 If KEY is nil, value is a cons cell of the form (HOST SERVICE),
1008 if KEY is t, the complete contact information for the connection is
1009 returned, else the specific value for the keyword KEY is returned.
1010 See `make-network-process' for a list of keywords. */)
1011 (process, key)
1012 register Lisp_Object process, key;
1014 Lisp_Object contact;
1016 CHECK_PROCESS (process);
1017 contact = XPROCESS (process)->childp;
1019 #ifdef DATAGRAM_SOCKETS
1020 if (DATAGRAM_CONN_P (process)
1021 && (EQ (key, Qt) || EQ (key, QCremote)))
1022 contact = Fplist_put (contact, QCremote,
1023 Fprocess_datagram_address (process));
1024 #endif
1026 if (!NETCONN_P (process) || EQ (key, Qt))
1027 return contact;
1028 if (NILP (key))
1029 return Fcons (Fplist_get (contact, QChost),
1030 Fcons (Fplist_get (contact, QCservice), Qnil));
1031 return Fplist_get (contact, key);
1034 #if 0 /* Turned off because we don't currently record this info
1035 in the process. Perhaps add it. */
1036 DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 1, 1, 0,
1037 doc: /* Return the connection type of PROCESS.
1038 The value is nil for a pipe, t or `pty' for a pty, or `stream' for
1039 a socket connection. */)
1040 (process)
1041 Lisp_Object process;
1043 return XPROCESS (process)->type;
1045 #endif
1047 Lisp_Object
1048 list_processes_1 (query_only)
1049 Lisp_Object query_only;
1051 register Lisp_Object tail, tem;
1052 Lisp_Object proc, minspace, tem1;
1053 register struct Lisp_Process *p;
1054 char tembuf[300];
1055 int w_proc, w_buffer, w_tty;
1056 Lisp_Object i_status, i_buffer, i_tty, i_command;
1058 w_proc = 4; /* Proc */
1059 w_buffer = 6; /* Buffer */
1060 w_tty = 0; /* Omit if no ttys */
1062 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
1064 int i;
1066 proc = Fcdr (Fcar (tail));
1067 p = XPROCESS (proc);
1068 if (NILP (p->childp))
1069 continue;
1070 if (!NILP (query_only) && !NILP (p->kill_without_query))
1071 continue;
1072 if (STRINGP (p->name)
1073 && ( i = SCHARS (p->name), (i > w_proc)))
1074 w_proc = i;
1075 if (!NILP (p->buffer))
1077 if (NILP (XBUFFER (p->buffer)->name) && w_buffer < 8)
1078 w_buffer = 8; /* (Killed) */
1079 else if ((i = SCHARS (XBUFFER (p->buffer)->name), (i > w_buffer)))
1080 w_buffer = i;
1082 if (STRINGP (p->tty_name)
1083 && (i = SCHARS (p->tty_name), (i > w_tty)))
1084 w_tty = i;
1087 XSETFASTINT (i_status, w_proc + 1);
1088 XSETFASTINT (i_buffer, XFASTINT (i_status) + 9);
1089 if (w_tty)
1091 XSETFASTINT (i_tty, XFASTINT (i_buffer) + w_buffer + 1);
1092 XSETFASTINT (i_command, XFASTINT (i_buffer) + w_tty + 1);
1093 } else {
1094 i_tty = Qnil;
1095 XSETFASTINT (i_command, XFASTINT (i_buffer) + w_buffer + 1);
1098 XSETFASTINT (minspace, 1);
1100 set_buffer_internal (XBUFFER (Vstandard_output));
1101 Fbuffer_disable_undo (Vstandard_output);
1103 current_buffer->truncate_lines = Qt;
1105 write_string ("Proc", -1);
1106 Findent_to (i_status, minspace); write_string ("Status", -1);
1107 Findent_to (i_buffer, minspace); write_string ("Buffer", -1);
1108 if (!NILP (i_tty))
1110 Findent_to (i_tty, minspace); write_string ("Tty", -1);
1112 Findent_to (i_command, minspace); write_string ("Command", -1);
1113 write_string ("\n", -1);
1115 write_string ("----", -1);
1116 Findent_to (i_status, minspace); write_string ("------", -1);
1117 Findent_to (i_buffer, minspace); write_string ("------", -1);
1118 if (!NILP (i_tty))
1120 Findent_to (i_tty, minspace); write_string ("---", -1);
1122 Findent_to (i_command, minspace); write_string ("-------", -1);
1123 write_string ("\n", -1);
1125 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
1127 Lisp_Object symbol;
1129 proc = Fcdr (Fcar (tail));
1130 p = XPROCESS (proc);
1131 if (NILP (p->childp))
1132 continue;
1133 if (!NILP (query_only) && !NILP (p->kill_without_query))
1134 continue;
1136 Finsert (1, &p->name);
1137 Findent_to (i_status, minspace);
1139 if (!NILP (p->raw_status_low))
1140 update_status (p);
1141 symbol = p->status;
1142 if (CONSP (p->status))
1143 symbol = XCAR (p->status);
1146 if (EQ (symbol, Qsignal))
1148 Lisp_Object tem;
1149 tem = Fcar (Fcdr (p->status));
1150 #ifdef VMS
1151 if (XINT (tem) < NSIG)
1152 write_string (sys_errlist [XINT (tem)], -1);
1153 else
1154 #endif
1155 Fprinc (symbol, Qnil);
1157 else if (NETCONN1_P (p))
1159 if (EQ (symbol, Qexit))
1160 write_string ("closed", -1);
1161 else if (EQ (p->command, Qt))
1162 write_string ("stopped", -1);
1163 else if (EQ (symbol, Qrun))
1164 write_string ("open", -1);
1165 else
1166 Fprinc (symbol, Qnil);
1168 else
1169 Fprinc (symbol, Qnil);
1171 if (EQ (symbol, Qexit))
1173 Lisp_Object tem;
1174 tem = Fcar (Fcdr (p->status));
1175 if (XFASTINT (tem))
1177 sprintf (tembuf, " %d", (int) XFASTINT (tem));
1178 write_string (tembuf, -1);
1182 if (EQ (symbol, Qsignal) || EQ (symbol, Qexit))
1183 remove_process (proc);
1185 Findent_to (i_buffer, minspace);
1186 if (NILP (p->buffer))
1187 insert_string ("(none)");
1188 else if (NILP (XBUFFER (p->buffer)->name))
1189 insert_string ("(Killed)");
1190 else
1191 Finsert (1, &XBUFFER (p->buffer)->name);
1193 if (!NILP (i_tty))
1195 Findent_to (i_tty, minspace);
1196 if (STRINGP (p->tty_name))
1197 Finsert (1, &p->tty_name);
1200 Findent_to (i_command, minspace);
1202 if (EQ (p->status, Qlisten))
1204 Lisp_Object port = Fplist_get (p->childp, QCservice);
1205 if (INTEGERP (port))
1206 port = Fnumber_to_string (port);
1207 sprintf (tembuf, "(network %s server on %s)\n",
1208 (DATAGRAM_CHAN_P (XINT (p->infd)) ? "datagram" : "stream"),
1209 SDATA (port));
1210 insert_string (tembuf);
1212 else if (NETCONN1_P (p))
1214 /* For a local socket, there is no host name,
1215 so display service instead. */
1216 Lisp_Object host = Fplist_get (p->childp, QChost);
1217 if (!STRINGP (host))
1219 host = Fplist_get (p->childp, QCservice);
1220 if (INTEGERP (host))
1221 host = Fnumber_to_string (host);
1223 sprintf (tembuf, "(network %s connection to %s)\n",
1224 (DATAGRAM_CHAN_P (XINT (p->infd)) ? "datagram" : "stream"),
1225 SDATA (host));
1226 insert_string (tembuf);
1228 else
1230 tem = p->command;
1231 while (1)
1233 tem1 = Fcar (tem);
1234 Finsert (1, &tem1);
1235 tem = Fcdr (tem);
1236 if (NILP (tem))
1237 break;
1238 insert_string (" ");
1240 insert_string ("\n");
1243 return Qnil;
1246 DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 1, "P",
1247 doc: /* Display a list of all processes.
1248 If optional argument QUERY-ONLY is non-nil, only processes with
1249 the query-on-exit flag set will be listed.
1250 Any process listed as exited or signaled is actually eliminated
1251 after the listing is made. */)
1252 (query_only)
1253 Lisp_Object query_only;
1255 internal_with_output_to_temp_buffer ("*Process List*",
1256 list_processes_1, query_only);
1257 return Qnil;
1260 DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0,
1261 doc: /* Return a list of all processes. */)
1264 return Fmapcar (Qcdr, Vprocess_alist);
1267 /* Starting asynchronous inferior processes. */
1269 static Lisp_Object start_process_unwind ();
1271 DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0,
1272 doc: /* Start a program in a subprocess. Return the process object for it.
1273 NAME is name for process. It is modified if necessary to make it unique.
1274 BUFFER is the buffer or (buffer-name) to associate with the process.
1275 Process output goes at end of that buffer, unless you specify
1276 an output stream or filter function to handle the output.
1277 BUFFER may be also nil, meaning that this process is not associated
1278 with any buffer.
1279 Third arg is program file name. It is searched for in PATH.
1280 Remaining arguments are strings to give program as arguments.
1282 usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS) */)
1283 (nargs, args)
1284 int nargs;
1285 register Lisp_Object *args;
1287 Lisp_Object buffer, name, program, proc, current_dir, tem;
1288 #ifdef VMS
1289 register unsigned char *new_argv;
1290 int len;
1291 #else
1292 register unsigned char **new_argv;
1293 #endif
1294 register int i;
1295 int count = SPECPDL_INDEX ();
1297 buffer = args[1];
1298 if (!NILP (buffer))
1299 buffer = Fget_buffer_create (buffer);
1301 /* Make sure that the child will be able to chdir to the current
1302 buffer's current directory, or its unhandled equivalent. We
1303 can't just have the child check for an error when it does the
1304 chdir, since it's in a vfork.
1306 We have to GCPRO around this because Fexpand_file_name and
1307 Funhandled_file_name_directory might call a file name handling
1308 function. The argument list is protected by the caller, so all
1309 we really have to worry about is buffer. */
1311 struct gcpro gcpro1, gcpro2;
1313 current_dir = current_buffer->directory;
1315 GCPRO2 (buffer, current_dir);
1317 current_dir
1318 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir),
1319 Qnil);
1320 if (NILP (Ffile_accessible_directory_p (current_dir)))
1321 report_file_error ("Setting current directory",
1322 Fcons (current_buffer->directory, Qnil));
1324 UNGCPRO;
1327 name = args[0];
1328 CHECK_STRING (name);
1330 program = args[2];
1332 CHECK_STRING (program);
1334 proc = make_process (name);
1335 /* If an error occurs and we can't start the process, we want to
1336 remove it from the process list. This means that each error
1337 check in create_process doesn't need to call remove_process
1338 itself; it's all taken care of here. */
1339 record_unwind_protect (start_process_unwind, proc);
1341 XPROCESS (proc)->childp = Qt;
1342 XPROCESS (proc)->command_channel_p = Qnil;
1343 XPROCESS (proc)->buffer = buffer;
1344 XPROCESS (proc)->sentinel = Qnil;
1345 XPROCESS (proc)->filter = Qnil;
1346 XPROCESS (proc)->command = Flist (nargs - 2, args + 2);
1348 /* Make the process marker point into the process buffer (if any). */
1349 if (!NILP (buffer))
1350 set_marker_both (XPROCESS (proc)->mark, buffer,
1351 BUF_ZV (XBUFFER (buffer)),
1352 BUF_ZV_BYTE (XBUFFER (buffer)));
1355 /* Decide coding systems for communicating with the process. Here
1356 we don't setup the structure coding_system nor pay attention to
1357 unibyte mode. They are done in create_process. */
1359 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1360 Lisp_Object coding_systems = Qt;
1361 Lisp_Object val, *args2;
1362 struct gcpro gcpro1, gcpro2;
1364 val = Vcoding_system_for_read;
1365 if (NILP (val))
1367 args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof *args2);
1368 args2[0] = Qstart_process;
1369 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1370 GCPRO2 (proc, current_dir);
1371 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1372 UNGCPRO;
1373 if (CONSP (coding_systems))
1374 val = XCAR (coding_systems);
1375 else if (CONSP (Vdefault_process_coding_system))
1376 val = XCAR (Vdefault_process_coding_system);
1378 XPROCESS (proc)->decode_coding_system = val;
1380 val = Vcoding_system_for_write;
1381 if (NILP (val))
1383 if (EQ (coding_systems, Qt))
1385 args2 = (Lisp_Object *) alloca ((nargs + 1) * sizeof args2);
1386 args2[0] = Qstart_process;
1387 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1388 GCPRO2 (proc, current_dir);
1389 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1390 UNGCPRO;
1392 if (CONSP (coding_systems))
1393 val = XCDR (coding_systems);
1394 else if (CONSP (Vdefault_process_coding_system))
1395 val = XCDR (Vdefault_process_coding_system);
1397 XPROCESS (proc)->encode_coding_system = val;
1400 #ifdef VMS
1401 /* Make a one member argv with all args concatenated
1402 together separated by a blank. */
1403 len = SBYTES (program) + 2;
1404 for (i = 3; i < nargs; i++)
1406 tem = args[i];
1407 CHECK_STRING (tem);
1408 len += SBYTES (tem) + 1; /* count the blank */
1410 new_argv = (unsigned char *) alloca (len);
1411 strcpy (new_argv, SDATA (program));
1412 for (i = 3; i < nargs; i++)
1414 tem = args[i];
1415 CHECK_STRING (tem);
1416 strcat (new_argv, " ");
1417 strcat (new_argv, SDATA (tem));
1419 /* Need to add code here to check for program existence on VMS */
1421 #else /* not VMS */
1422 new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *));
1424 /* If program file name is not absolute, search our path for it.
1425 Put the name we will really use in TEM. */
1426 if (!IS_DIRECTORY_SEP (SREF (program, 0))
1427 && !(SCHARS (program) > 1
1428 && IS_DEVICE_SEP (SREF (program, 1))))
1430 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
1432 tem = Qnil;
1433 GCPRO4 (name, program, buffer, current_dir);
1434 openp (Vexec_path, program, Vexec_suffixes, &tem, make_number (X_OK));
1435 UNGCPRO;
1436 if (NILP (tem))
1437 report_file_error ("Searching for program", Fcons (program, Qnil));
1438 tem = Fexpand_file_name (tem, Qnil);
1440 else
1442 if (!NILP (Ffile_directory_p (program)))
1443 error ("Specified program for new process is a directory");
1444 tem = program;
1447 /* If program file name starts with /: for quoting a magic name,
1448 discard that. */
1449 if (SBYTES (tem) > 2 && SREF (tem, 0) == '/'
1450 && SREF (tem, 1) == ':')
1451 tem = Fsubstring (tem, make_number (2), Qnil);
1453 /* Encode the file name and put it in NEW_ARGV.
1454 That's where the child will use it to execute the program. */
1455 tem = ENCODE_FILE (tem);
1456 new_argv[0] = SDATA (tem);
1458 /* Here we encode arguments by the coding system used for sending
1459 data to the process. We don't support using different coding
1460 systems for encoding arguments and for encoding data sent to the
1461 process. */
1463 for (i = 3; i < nargs; i++)
1465 tem = args[i];
1466 CHECK_STRING (tem);
1467 if (STRING_MULTIBYTE (tem))
1468 tem = (code_convert_string_norecord
1469 (tem, XPROCESS (proc)->encode_coding_system, 1));
1470 new_argv[i - 2] = SDATA (tem);
1472 new_argv[i - 2] = 0;
1473 #endif /* not VMS */
1475 XPROCESS (proc)->decoding_buf = make_uninit_string (0);
1476 XPROCESS (proc)->decoding_carryover = make_number (0);
1477 XPROCESS (proc)->encoding_buf = make_uninit_string (0);
1478 XPROCESS (proc)->encoding_carryover = make_number (0);
1480 XPROCESS (proc)->inherit_coding_system_flag
1481 = (NILP (buffer) || !inherit_process_coding_system
1482 ? Qnil : Qt);
1484 create_process (proc, (char **) new_argv, current_dir);
1486 return unbind_to (count, proc);
1489 /* This function is the unwind_protect form for Fstart_process. If
1490 PROC doesn't have its pid set, then we know someone has signaled
1491 an error and the process wasn't started successfully, so we should
1492 remove it from the process list. */
1493 static Lisp_Object
1494 start_process_unwind (proc)
1495 Lisp_Object proc;
1497 if (!PROCESSP (proc))
1498 abort ();
1500 /* Was PROC started successfully? */
1501 if (XINT (XPROCESS (proc)->pid) <= 0)
1502 remove_process (proc);
1504 return Qnil;
1507 void
1508 create_process_1 (timer)
1509 struct atimer *timer;
1511 /* Nothing to do. */
1515 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1516 #ifdef USG
1517 #ifdef SIGCHLD
1518 /* Mimic blocking of signals on system V, which doesn't really have it. */
1520 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1521 int sigchld_deferred;
1523 SIGTYPE
1524 create_process_sigchld ()
1526 signal (SIGCHLD, create_process_sigchld);
1528 sigchld_deferred = 1;
1530 #endif
1531 #endif
1532 #endif
1534 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1535 void
1536 create_process (process, new_argv, current_dir)
1537 Lisp_Object process;
1538 char **new_argv;
1539 Lisp_Object current_dir;
1541 int pid, inchannel, outchannel;
1542 int sv[2];
1543 #ifdef POSIX_SIGNALS
1544 sigset_t procmask;
1545 sigset_t blocked;
1546 struct sigaction sigint_action;
1547 struct sigaction sigquit_action;
1548 #ifdef AIX
1549 struct sigaction sighup_action;
1550 #endif
1551 #else /* !POSIX_SIGNALS */
1552 #if 0
1553 #ifdef SIGCHLD
1554 SIGTYPE (*sigchld)();
1555 #endif
1556 #endif /* 0 */
1557 #endif /* !POSIX_SIGNALS */
1558 /* Use volatile to protect variables from being clobbered by longjmp. */
1559 volatile int forkin, forkout;
1560 volatile int pty_flag = 0;
1561 #ifndef USE_CRT_DLL
1562 extern char **environ;
1563 #endif
1565 inchannel = outchannel = -1;
1567 #ifdef HAVE_PTYS
1568 if (!NILP (Vprocess_connection_type))
1569 outchannel = inchannel = allocate_pty ();
1571 if (inchannel >= 0)
1573 #if ! defined (USG) || defined (USG_SUBTTY_WORKS)
1574 /* On most USG systems it does not work to open the pty's tty here,
1575 then close it and reopen it in the child. */
1576 #ifdef O_NOCTTY
1577 /* Don't let this terminal become our controlling terminal
1578 (in case we don't have one). */
1579 forkout = forkin = emacs_open (pty_name, O_RDWR | O_NOCTTY, 0);
1580 #else
1581 forkout = forkin = emacs_open (pty_name, O_RDWR, 0);
1582 #endif
1583 if (forkin < 0)
1584 report_file_error ("Opening pty", Qnil);
1585 #else
1586 forkin = forkout = -1;
1587 #endif /* not USG, or USG_SUBTTY_WORKS */
1588 pty_flag = 1;
1590 else
1591 #endif /* HAVE_PTYS */
1592 #ifdef SKTPAIR
1594 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
1595 report_file_error ("Opening socketpair", Qnil);
1596 outchannel = inchannel = sv[0];
1597 forkout = forkin = sv[1];
1599 #else /* not SKTPAIR */
1601 int tem;
1602 tem = pipe (sv);
1603 if (tem < 0)
1604 report_file_error ("Creating pipe", Qnil);
1605 inchannel = sv[0];
1606 forkout = sv[1];
1607 tem = pipe (sv);
1608 if (tem < 0)
1610 emacs_close (inchannel);
1611 emacs_close (forkout);
1612 report_file_error ("Creating pipe", Qnil);
1614 outchannel = sv[1];
1615 forkin = sv[0];
1617 #endif /* not SKTPAIR */
1619 #if 0
1620 /* Replaced by close_process_descs */
1621 set_exclusive_use (inchannel);
1622 set_exclusive_use (outchannel);
1623 #endif
1625 /* Stride people say it's a mystery why this is needed
1626 as well as the O_NDELAY, but that it fails without this. */
1627 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1629 int one = 1;
1630 ioctl (inchannel, FIONBIO, &one);
1632 #endif
1634 #ifdef O_NONBLOCK
1635 fcntl (inchannel, F_SETFL, O_NONBLOCK);
1636 fcntl (outchannel, F_SETFL, O_NONBLOCK);
1637 #else
1638 #ifdef O_NDELAY
1639 fcntl (inchannel, F_SETFL, O_NDELAY);
1640 fcntl (outchannel, F_SETFL, O_NDELAY);
1641 #endif
1642 #endif
1644 /* Record this as an active process, with its channels.
1645 As a result, child_setup will close Emacs's side of the pipes. */
1646 chan_process[inchannel] = process;
1647 XSETINT (XPROCESS (process)->infd, inchannel);
1648 XSETINT (XPROCESS (process)->outfd, outchannel);
1649 /* Record the tty descriptor used in the subprocess. */
1650 if (forkin < 0)
1651 XPROCESS (process)->subtty = Qnil;
1652 else
1653 XSETFASTINT (XPROCESS (process)->subtty, forkin);
1654 XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil);
1655 XPROCESS (process)->status = Qrun;
1656 if (!proc_decode_coding_system[inchannel])
1657 proc_decode_coding_system[inchannel]
1658 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
1659 setup_coding_system (XPROCESS (process)->decode_coding_system,
1660 proc_decode_coding_system[inchannel]);
1661 if (!proc_encode_coding_system[outchannel])
1662 proc_encode_coding_system[outchannel]
1663 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
1664 setup_coding_system (XPROCESS (process)->encode_coding_system,
1665 proc_encode_coding_system[outchannel]);
1667 /* Delay interrupts until we have a chance to store
1668 the new fork's pid in its process structure */
1669 #ifdef POSIX_SIGNALS
1670 sigemptyset (&blocked);
1671 #ifdef SIGCHLD
1672 sigaddset (&blocked, SIGCHLD);
1673 #endif
1674 #ifdef HAVE_WORKING_VFORK
1675 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
1676 this sets the parent's signal handlers as well as the child's.
1677 So delay all interrupts whose handlers the child might munge,
1678 and record the current handlers so they can be restored later. */
1679 sigaddset (&blocked, SIGINT ); sigaction (SIGINT , 0, &sigint_action );
1680 sigaddset (&blocked, SIGQUIT); sigaction (SIGQUIT, 0, &sigquit_action);
1681 #ifdef AIX
1682 sigaddset (&blocked, SIGHUP ); sigaction (SIGHUP , 0, &sighup_action );
1683 #endif
1684 #endif /* HAVE_WORKING_VFORK */
1685 sigprocmask (SIG_BLOCK, &blocked, &procmask);
1686 #else /* !POSIX_SIGNALS */
1687 #ifdef SIGCHLD
1688 #ifdef BSD4_1
1689 sighold (SIGCHLD);
1690 #else /* not BSD4_1 */
1691 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1692 sigsetmask (sigmask (SIGCHLD));
1693 #else /* ordinary USG */
1694 #if 0
1695 sigchld_deferred = 0;
1696 sigchld = signal (SIGCHLD, create_process_sigchld);
1697 #endif
1698 #endif /* ordinary USG */
1699 #endif /* not BSD4_1 */
1700 #endif /* SIGCHLD */
1701 #endif /* !POSIX_SIGNALS */
1703 FD_SET (inchannel, &input_wait_mask);
1704 FD_SET (inchannel, &non_keyboard_wait_mask);
1705 if (inchannel > max_process_desc)
1706 max_process_desc = inchannel;
1708 /* Until we store the proper pid, enable sigchld_handler
1709 to recognize an unknown pid as standing for this process.
1710 It is very important not to let this `marker' value stay
1711 in the table after this function has returned; if it does
1712 it might cause call-process to hang and subsequent asynchronous
1713 processes to get their return values scrambled. */
1714 XSETINT (XPROCESS (process)->pid, -1);
1716 BLOCK_INPUT;
1719 /* child_setup must clobber environ on systems with true vfork.
1720 Protect it from permanent change. */
1721 char **save_environ = environ;
1723 current_dir = ENCODE_FILE (current_dir);
1725 #ifndef WINDOWSNT
1726 pid = vfork ();
1727 if (pid == 0)
1728 #endif /* not WINDOWSNT */
1730 int xforkin = forkin;
1731 int xforkout = forkout;
1733 #if 0 /* This was probably a mistake--it duplicates code later on,
1734 but fails to handle all the cases. */
1735 /* Make sure SIGCHLD is not blocked in the child. */
1736 sigsetmask (SIGEMPTYMASK);
1737 #endif
1739 /* Make the pty be the controlling terminal of the process. */
1740 #ifdef HAVE_PTYS
1741 /* First, disconnect its current controlling terminal. */
1742 #ifdef HAVE_SETSID
1743 /* We tried doing setsid only if pty_flag, but it caused
1744 process_set_signal to fail on SGI when using a pipe. */
1745 setsid ();
1746 /* Make the pty's terminal the controlling terminal. */
1747 if (pty_flag)
1749 #ifdef TIOCSCTTY
1750 /* We ignore the return value
1751 because faith@cs.unc.edu says that is necessary on Linux. */
1752 ioctl (xforkin, TIOCSCTTY, 0);
1753 #endif
1755 #else /* not HAVE_SETSID */
1756 #ifdef USG
1757 /* It's very important to call setpgrp here and no time
1758 afterwards. Otherwise, we lose our controlling tty which
1759 is set when we open the pty. */
1760 setpgrp ();
1761 #endif /* USG */
1762 #endif /* not HAVE_SETSID */
1763 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1764 if (pty_flag && xforkin >= 0)
1766 struct termios t;
1767 tcgetattr (xforkin, &t);
1768 t.c_lflag = LDISC1;
1769 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
1770 emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1772 #else
1773 #if defined (NTTYDISC) && defined (TIOCSETD)
1774 if (pty_flag && xforkin >= 0)
1776 /* Use new line discipline. */
1777 int ldisc = NTTYDISC;
1778 ioctl (xforkin, TIOCSETD, &ldisc);
1780 #endif
1781 #endif
1782 #ifdef TIOCNOTTY
1783 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1784 can do TIOCSPGRP only to the process's controlling tty. */
1785 if (pty_flag)
1787 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1788 I can't test it since I don't have 4.3. */
1789 int j = emacs_open ("/dev/tty", O_RDWR, 0);
1790 ioctl (j, TIOCNOTTY, 0);
1791 emacs_close (j);
1792 #ifndef USG
1793 /* In order to get a controlling terminal on some versions
1794 of BSD, it is necessary to put the process in pgrp 0
1795 before it opens the terminal. */
1796 #ifdef HAVE_SETPGID
1797 setpgid (0, 0);
1798 #else
1799 setpgrp (0, 0);
1800 #endif
1801 #endif
1803 #endif /* TIOCNOTTY */
1805 #if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
1806 /*** There is a suggestion that this ought to be a
1807 conditional on TIOCSPGRP,
1808 or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
1809 Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
1810 that system does seem to need this code, even though
1811 both HAVE_SETSID and TIOCSCTTY are defined. */
1812 /* Now close the pty (if we had it open) and reopen it.
1813 This makes the pty the controlling terminal of the subprocess. */
1814 if (pty_flag)
1816 #ifdef SET_CHILD_PTY_PGRP
1817 int pgrp = getpid ();
1818 #endif
1820 /* I wonder if emacs_close (emacs_open (pty_name, ...))
1821 would work? */
1822 if (xforkin >= 0)
1823 emacs_close (xforkin);
1824 xforkout = xforkin = emacs_open (pty_name, O_RDWR, 0);
1826 if (xforkin < 0)
1828 emacs_write (1, "Couldn't open the pty terminal ", 31);
1829 emacs_write (1, pty_name, strlen (pty_name));
1830 emacs_write (1, "\n", 1);
1831 _exit (1);
1834 #ifdef SET_CHILD_PTY_PGRP
1835 ioctl (xforkin, TIOCSPGRP, &pgrp);
1836 ioctl (xforkout, TIOCSPGRP, &pgrp);
1837 #endif
1839 #endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */
1841 #ifdef SETUP_SLAVE_PTY
1842 if (pty_flag)
1844 SETUP_SLAVE_PTY;
1846 #endif /* SETUP_SLAVE_PTY */
1847 #ifdef AIX
1848 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1849 Now reenable it in the child, so it will die when we want it to. */
1850 if (pty_flag)
1851 signal (SIGHUP, SIG_DFL);
1852 #endif
1853 #endif /* HAVE_PTYS */
1855 signal (SIGINT, SIG_DFL);
1856 signal (SIGQUIT, SIG_DFL);
1858 /* Stop blocking signals in the child. */
1859 #ifdef POSIX_SIGNALS
1860 sigprocmask (SIG_SETMASK, &procmask, 0);
1861 #else /* !POSIX_SIGNALS */
1862 #ifdef SIGCHLD
1863 #ifdef BSD4_1
1864 sigrelse (SIGCHLD);
1865 #else /* not BSD4_1 */
1866 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1867 sigsetmask (SIGEMPTYMASK);
1868 #else /* ordinary USG */
1869 #if 0
1870 signal (SIGCHLD, sigchld);
1871 #endif
1872 #endif /* ordinary USG */
1873 #endif /* not BSD4_1 */
1874 #endif /* SIGCHLD */
1875 #endif /* !POSIX_SIGNALS */
1877 if (pty_flag)
1878 child_setup_tty (xforkout);
1879 #ifdef WINDOWSNT
1880 pid = child_setup (xforkin, xforkout, xforkout,
1881 new_argv, 1, current_dir);
1882 #else /* not WINDOWSNT */
1883 child_setup (xforkin, xforkout, xforkout,
1884 new_argv, 1, current_dir);
1885 #endif /* not WINDOWSNT */
1887 environ = save_environ;
1890 UNBLOCK_INPUT;
1892 /* This runs in the Emacs process. */
1893 if (pid < 0)
1895 if (forkin >= 0)
1896 emacs_close (forkin);
1897 if (forkin != forkout && forkout >= 0)
1898 emacs_close (forkout);
1900 else
1902 /* vfork succeeded. */
1903 XSETFASTINT (XPROCESS (process)->pid, pid);
1905 #ifdef WINDOWSNT
1906 register_child (pid, inchannel);
1907 #endif /* WINDOWSNT */
1909 /* If the subfork execv fails, and it exits,
1910 this close hangs. I don't know why.
1911 So have an interrupt jar it loose. */
1913 struct atimer *timer;
1914 EMACS_TIME offset;
1916 stop_polling ();
1917 EMACS_SET_SECS_USECS (offset, 1, 0);
1918 timer = start_atimer (ATIMER_RELATIVE, offset, create_process_1, 0);
1920 XPROCESS (process)->subtty = Qnil;
1921 if (forkin >= 0)
1922 emacs_close (forkin);
1924 cancel_atimer (timer);
1925 start_polling ();
1928 if (forkin != forkout && forkout >= 0)
1929 emacs_close (forkout);
1931 #ifdef HAVE_PTYS
1932 if (pty_flag)
1933 XPROCESS (process)->tty_name = build_string (pty_name);
1934 else
1935 #endif
1936 XPROCESS (process)->tty_name = Qnil;
1939 /* Restore the signal state whether vfork succeeded or not.
1940 (We will signal an error, below, if it failed.) */
1941 #ifdef POSIX_SIGNALS
1942 #ifdef HAVE_WORKING_VFORK
1943 /* Restore the parent's signal handlers. */
1944 sigaction (SIGINT, &sigint_action, 0);
1945 sigaction (SIGQUIT, &sigquit_action, 0);
1946 #ifdef AIX
1947 sigaction (SIGHUP, &sighup_action, 0);
1948 #endif
1949 #endif /* HAVE_WORKING_VFORK */
1950 /* Stop blocking signals in the parent. */
1951 sigprocmask (SIG_SETMASK, &procmask, 0);
1952 #else /* !POSIX_SIGNALS */
1953 #ifdef SIGCHLD
1954 #ifdef BSD4_1
1955 sigrelse (SIGCHLD);
1956 #else /* not BSD4_1 */
1957 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1958 sigsetmask (SIGEMPTYMASK);
1959 #else /* ordinary USG */
1960 #if 0
1961 signal (SIGCHLD, sigchld);
1962 /* Now really handle any of these signals
1963 that came in during this function. */
1964 if (sigchld_deferred)
1965 kill (getpid (), SIGCHLD);
1966 #endif
1967 #endif /* ordinary USG */
1968 #endif /* not BSD4_1 */
1969 #endif /* SIGCHLD */
1970 #endif /* !POSIX_SIGNALS */
1972 /* Now generate the error if vfork failed. */
1973 if (pid < 0)
1974 report_file_error ("Doing vfork", Qnil);
1976 #endif /* not VMS */
1979 #ifdef HAVE_SOCKETS
1981 /* Convert an internal struct sockaddr to a lisp object (vector or string).
1982 The address family of sa is not included in the result. */
1984 static Lisp_Object
1985 conv_sockaddr_to_lisp (sa, len)
1986 struct sockaddr *sa;
1987 int len;
1989 Lisp_Object address;
1990 int i;
1991 unsigned char *cp;
1992 register struct Lisp_Vector *p;
1994 switch (sa->sa_family)
1996 case AF_INET:
1998 struct sockaddr_in *sin = (struct sockaddr_in *) sa;
1999 len = sizeof (sin->sin_addr) + 1;
2000 address = Fmake_vector (make_number (len), Qnil);
2001 p = XVECTOR (address);
2002 p->contents[--len] = make_number (ntohs (sin->sin_port));
2003 cp = (unsigned char *)&sin->sin_addr;
2004 break;
2006 #ifdef HAVE_LOCAL_SOCKETS
2007 case AF_LOCAL:
2009 struct sockaddr_un *sockun = (struct sockaddr_un *) sa;
2010 for (i = 0; i < sizeof (sockun->sun_path); i++)
2011 if (sockun->sun_path[i] == 0)
2012 break;
2013 return make_unibyte_string (sockun->sun_path, i);
2015 #endif
2016 default:
2017 len -= sizeof (sa->sa_family);
2018 address = Fcons (make_number (sa->sa_family),
2019 Fmake_vector (make_number (len), Qnil));
2020 p = XVECTOR (XCDR (address));
2021 cp = (unsigned char *) sa + sizeof (sa->sa_family);
2022 break;
2025 i = 0;
2026 while (i < len)
2027 p->contents[i++] = make_number (*cp++);
2029 return address;
2033 /* Get family and required size for sockaddr structure to hold ADDRESS. */
2035 static int
2036 get_lisp_to_sockaddr_size (address, familyp)
2037 Lisp_Object address;
2038 int *familyp;
2040 register struct Lisp_Vector *p;
2042 if (VECTORP (address))
2044 p = XVECTOR (address);
2045 if (p->size == 5)
2047 *familyp = AF_INET;
2048 return sizeof (struct sockaddr_in);
2051 #ifdef HAVE_LOCAL_SOCKETS
2052 else if (STRINGP (address))
2054 *familyp = AF_LOCAL;
2055 return sizeof (struct sockaddr_un);
2057 #endif
2058 else if (CONSP (address) && INTEGERP (XCAR (address)) && VECTORP (XCDR (address)))
2060 struct sockaddr *sa;
2061 *familyp = XINT (XCAR (address));
2062 p = XVECTOR (XCDR (address));
2063 return p->size + sizeof (sa->sa_family);
2065 return 0;
2068 /* Convert an address object (vector or string) to an internal sockaddr.
2069 Format of address has already been validated by size_lisp_to_sockaddr. */
2071 static void
2072 conv_lisp_to_sockaddr (family, address, sa, len)
2073 int family;
2074 Lisp_Object address;
2075 struct sockaddr *sa;
2076 int len;
2078 register struct Lisp_Vector *p;
2079 register unsigned char *cp;
2080 register int i;
2082 bzero (sa, len);
2083 sa->sa_family = family;
2085 if (VECTORP (address))
2087 p = XVECTOR (address);
2088 if (family == AF_INET)
2090 struct sockaddr_in *sin = (struct sockaddr_in *) sa;
2091 len = sizeof (sin->sin_addr) + 1;
2092 i = XINT (p->contents[--len]);
2093 sin->sin_port = htons (i);
2094 cp = (unsigned char *)&sin->sin_addr;
2097 else if (STRINGP (address))
2099 #ifdef HAVE_LOCAL_SOCKETS
2100 if (family == AF_LOCAL)
2102 struct sockaddr_un *sockun = (struct sockaddr_un *) sa;
2103 cp = SDATA (address);
2104 for (i = 0; i < sizeof (sockun->sun_path) && *cp; i++)
2105 sockun->sun_path[i] = *cp++;
2107 #endif
2108 return;
2110 else
2112 p = XVECTOR (XCDR (address));
2113 cp = (unsigned char *)sa + sizeof (sa->sa_family);
2116 for (i = 0; i < len; i++)
2117 if (INTEGERP (p->contents[i]))
2118 *cp++ = XFASTINT (p->contents[i]) & 0xff;
2121 #ifdef DATAGRAM_SOCKETS
2122 DEFUN ("process-datagram-address", Fprocess_datagram_address, Sprocess_datagram_address,
2123 1, 1, 0,
2124 doc: /* Get the current datagram address associated with PROCESS. */)
2125 (process)
2126 Lisp_Object process;
2128 int channel;
2130 CHECK_PROCESS (process);
2132 if (!DATAGRAM_CONN_P (process))
2133 return Qnil;
2135 channel = XINT (XPROCESS (process)->infd);
2136 return conv_sockaddr_to_lisp (datagram_address[channel].sa,
2137 datagram_address[channel].len);
2140 DEFUN ("set-process-datagram-address", Fset_process_datagram_address, Sset_process_datagram_address,
2141 2, 2, 0,
2142 doc: /* Set the datagram address for PROCESS to ADDRESS.
2143 Returns nil upon error setting address, ADDRESS otherwise. */)
2144 (process, address)
2145 Lisp_Object process, address;
2147 int channel;
2148 int family, len;
2150 CHECK_PROCESS (process);
2152 if (!DATAGRAM_CONN_P (process))
2153 return Qnil;
2155 channel = XINT (XPROCESS (process)->infd);
2157 len = get_lisp_to_sockaddr_size (address, &family);
2158 if (datagram_address[channel].len != len)
2159 return Qnil;
2160 conv_lisp_to_sockaddr (family, address, datagram_address[channel].sa, len);
2161 return address;
2163 #endif
2166 static struct socket_options {
2167 /* The name of this option. Should be lowercase version of option
2168 name without SO_ prefix. */
2169 char *name;
2170 /* Length of name. */
2171 int nlen;
2172 /* Option level SOL_... */
2173 int optlevel;
2174 /* Option number SO_... */
2175 int optnum;
2176 enum { SOPT_UNKNOWN, SOPT_BOOL, SOPT_INT, SOPT_STR, SOPT_LINGER } opttype;
2177 } socket_options[] =
2179 #ifdef SO_BINDTODEVICE
2180 { "bindtodevice", 12, SOL_SOCKET, SO_BINDTODEVICE, SOPT_STR },
2181 #endif
2182 #ifdef SO_BROADCAST
2183 { "broadcast", 9, SOL_SOCKET, SO_BROADCAST, SOPT_BOOL },
2184 #endif
2185 #ifdef SO_DONTROUTE
2186 { "dontroute", 9, SOL_SOCKET, SO_DONTROUTE, SOPT_BOOL },
2187 #endif
2188 #ifdef SO_KEEPALIVE
2189 { "keepalive", 9, SOL_SOCKET, SO_KEEPALIVE, SOPT_BOOL },
2190 #endif
2191 #ifdef SO_LINGER
2192 { "linger", 6, SOL_SOCKET, SO_LINGER, SOPT_LINGER },
2193 #endif
2194 #ifdef SO_OOBINLINE
2195 { "oobinline", 9, SOL_SOCKET, SO_OOBINLINE, SOPT_BOOL },
2196 #endif
2197 #ifdef SO_PRIORITY
2198 { "priority", 8, SOL_SOCKET, SO_PRIORITY, SOPT_INT },
2199 #endif
2200 #ifdef SO_REUSEADDR
2201 { "reuseaddr", 9, SOL_SOCKET, SO_REUSEADDR, SOPT_BOOL },
2202 #endif
2203 { 0, 0, 0, 0, SOPT_UNKNOWN }
2206 /* Process list of socket options OPTS on socket S.
2207 Only check if options are supported is S < 0.
2208 If NO_ERROR is non-zero, continue silently if an option
2209 cannot be set.
2211 Each element specifies one option. An element is either a string
2212 "OPTION=VALUE" or a cons (OPTION . VALUE) where OPTION is a string
2213 or a symbol. */
2215 static int
2216 set_socket_options (s, opts, no_error)
2217 int s;
2218 Lisp_Object opts;
2219 int no_error;
2221 if (!CONSP (opts))
2222 opts = Fcons (opts, Qnil);
2224 while (CONSP (opts))
2226 Lisp_Object opt;
2227 Lisp_Object val;
2228 char *name, *arg;
2229 struct socket_options *sopt;
2230 int ret = 0;
2232 opt = XCAR (opts);
2233 opts = XCDR (opts);
2235 name = 0;
2236 val = Qt;
2237 if (CONSP (opt))
2239 val = XCDR (opt);
2240 opt = XCAR (opt);
2242 if (STRINGP (opt))
2243 name = (char *) SDATA (opt);
2244 else if (SYMBOLP (opt))
2245 name = (char *) SDATA (SYMBOL_NAME (opt));
2246 else {
2247 error ("Mal-formed option list");
2248 return 0;
2251 if (strncmp (name, "no", 2) == 0)
2253 val = Qnil;
2254 name += 2;
2257 arg = 0;
2258 for (sopt = socket_options; sopt->name; sopt++)
2259 if (strncmp (name, sopt->name, sopt->nlen) == 0)
2261 if (name[sopt->nlen] == 0)
2262 break;
2263 if (name[sopt->nlen] == '=')
2265 arg = name + sopt->nlen + 1;
2266 break;
2270 switch (sopt->opttype)
2272 case SOPT_BOOL:
2274 int optval;
2275 if (s < 0)
2276 return 1;
2277 if (arg)
2278 optval = (*arg == '0' || *arg == 'n') ? 0 : 1;
2279 else if (INTEGERP (val))
2280 optval = XINT (val) == 0 ? 0 : 1;
2281 else
2282 optval = NILP (val) ? 0 : 1;
2283 ret = setsockopt (s, sopt->optlevel, sopt->optnum,
2284 &optval, sizeof (optval));
2285 break;
2288 case SOPT_INT:
2290 int optval;
2291 if (arg)
2292 optval = atoi(arg);
2293 else if (INTEGERP (val))
2294 optval = XINT (val);
2295 else
2296 error ("Bad option argument for %s", name);
2297 if (s < 0)
2298 return 1;
2299 ret = setsockopt (s, sopt->optlevel, sopt->optnum,
2300 &optval, sizeof (optval));
2301 break;
2304 case SOPT_STR:
2306 if (!arg)
2308 if (NILP (val))
2309 arg = "";
2310 else if (STRINGP (val))
2311 arg = (char *) SDATA (val);
2312 else if (XSYMBOL (val))
2313 arg = (char *) SDATA (SYMBOL_NAME (val));
2314 else
2315 error ("Invalid argument to %s option", name);
2317 ret = setsockopt (s, sopt->optlevel, sopt->optnum,
2318 arg, strlen (arg));
2321 #ifdef SO_LINGER
2322 case SOPT_LINGER:
2324 struct linger linger;
2326 linger.l_onoff = 1;
2327 linger.l_linger = 0;
2329 if (s < 0)
2330 return 1;
2332 if (arg)
2334 if (*arg == 'n' || *arg == 't' || *arg == 'y')
2335 linger.l_onoff = (*arg == 'n') ? 0 : 1;
2336 else
2337 linger.l_linger = atoi(arg);
2339 else if (INTEGERP (val))
2340 linger.l_linger = XINT (val);
2341 else
2342 linger.l_onoff = NILP (val) ? 0 : 1;
2343 ret = setsockopt (s, sopt->optlevel, sopt->optnum,
2344 &linger, sizeof (linger));
2345 break;
2347 #endif
2348 default:
2349 if (s < 0)
2350 return 0;
2351 if (no_error)
2352 continue;
2353 error ("Unsupported option: %s", name);
2355 if (ret < 0 && ! no_error)
2356 report_file_error ("Cannot set network option: %s", opt);
2358 return 1;
2361 DEFUN ("set-network-process-options",
2362 Fset_network_process_options, Sset_network_process_options,
2363 1, MANY, 0,
2364 doc: /* Set one or more options for network process PROCESS.
2365 Each option is either a string "OPT=VALUE" or a cons (OPT . VALUE).
2366 A boolean value is false if it either zero or nil, true otherwise.
2368 The following options are known. Consult the relevant system manual
2369 pages for more information.
2371 bindtodevice=NAME -- bind to interface NAME, or remove binding if nil.
2372 broadcast=BOOL -- Allow send and receive of datagram broadcasts.
2373 dontroute=BOOL -- Only send to directly connected hosts.
2374 keepalive=BOOL -- Send keep-alive messages on network stream.
2375 linger=BOOL or TIMEOUT -- Send queued messages before closing.
2376 oobinline=BOOL -- Place out-of-band data in receive data stream.
2377 priority=INT -- Set protocol defined priority for sent packets.
2378 reuseaddr=BOOL -- Allow reusing a recently used address.
2380 usage: (set-network-process-options PROCESS &rest OPTIONS) */)
2381 (nargs, args)
2382 int nargs;
2383 Lisp_Object *args;
2385 Lisp_Object process;
2386 Lisp_Object opts;
2388 process = args[0];
2389 CHECK_PROCESS (process);
2390 if (nargs > 1 && XINT (XPROCESS (process)->infd) >= 0)
2392 opts = Flist (nargs, args);
2393 set_socket_options (XINT (XPROCESS (process)->infd), opts, 0);
2395 return process;
2398 /* A version of request_sigio suitable for a record_unwind_protect. */
2400 Lisp_Object
2401 unwind_request_sigio (dummy)
2402 Lisp_Object dummy;
2404 if (interrupt_input)
2405 request_sigio ();
2406 return Qnil;
2409 /* Create a network stream/datagram client/server process. Treated
2410 exactly like a normal process when reading and writing. Primary
2411 differences are in status display and process deletion. A network
2412 connection has no PID; you cannot signal it. All you can do is
2413 stop/continue it and deactivate/close it via delete-process */
2415 DEFUN ("make-network-process", Fmake_network_process, Smake_network_process,
2416 0, MANY, 0,
2417 doc: /* Create and return a network server or client process.
2419 In Emacs, network connections are represented by process objects, so
2420 input and output work as for subprocesses and `delete-process' closes
2421 a network connection. However, a network process has no process id,
2422 it cannot be signalled, and the status codes are different from normal
2423 processes.
2425 Arguments are specified as keyword/argument pairs. The following
2426 arguments are defined:
2428 :name NAME -- NAME is name for process. It is modified if necessary
2429 to make it unique.
2431 :buffer BUFFER -- BUFFER is the buffer (or buffer-name) to associate
2432 with the process. Process output goes at end of that buffer, unless
2433 you specify an output stream or filter function to handle the output.
2434 BUFFER may be also nil, meaning that this process is not associated
2435 with any buffer.
2437 :host HOST -- HOST is name of the host to connect to, or its IP
2438 address. The symbol `local' specifies the local host. If specified
2439 for a server process, it must be a valid name or address for the local
2440 host, and only clients connecting to that address will be accepted.
2442 :service SERVICE -- SERVICE is name of the service desired, or an
2443 integer specifying a port number to connect to. If SERVICE is t,
2444 a random port number is selected for the server.
2446 :type TYPE -- TYPE is the type of connection. The default (nil) is a
2447 stream type connection, `datagram' creates a datagram type connection.
2449 :family FAMILY -- FAMILY is the address (and protocol) family for the
2450 service specified by HOST and SERVICE. The default address family is
2451 Inet (or IPv4) for the host and port number specified by HOST and
2452 SERVICE. Other address families supported are:
2453 local -- for a local (i.e. UNIX) address specified by SERVICE.
2455 :local ADDRESS -- ADDRESS is the local address used for the connection.
2456 This parameter is ignored when opening a client process. When specified
2457 for a server process, the FAMILY, HOST and SERVICE args are ignored.
2459 :remote ADDRESS -- ADDRESS is the remote partner's address for the
2460 connection. This parameter is ignored when opening a stream server
2461 process. For a datagram server process, it specifies the initial
2462 setting of the remote datagram address. When specified for a client
2463 process, the FAMILY, HOST, and SERVICE args are ignored.
2465 The format of ADDRESS depends on the address family:
2466 - An IPv4 address is represented as an vector of integers [A B C D P]
2467 corresponding to numeric IP address A.B.C.D and port number P.
2468 - A local address is represented as a string with the address in the
2469 local address space.
2470 - An "unsupported family" address is represented by a cons (F . AV)
2471 where F is the family number and AV is a vector containing the socket
2472 address data with one element per address data byte. Do not rely on
2473 this format in portable code, as it may depend on implementation
2474 defined constants, data sizes, and data structure alignment.
2476 :coding CODING -- CODING is coding system for this process.
2478 :options OPTIONS -- Set the specified options for the network process.
2479 See `set-network-process-options' for details.
2481 :nowait BOOL -- If BOOL is non-nil for a stream type client process,
2482 return without waiting for the connection to complete; instead, the
2483 sentinel function will be called with second arg matching "open" (if
2484 successful) or "failed" when the connect completes. Default is to use
2485 a blocking connect (i.e. wait) for stream type connections.
2487 :noquery BOOL -- Query the user unless BOOL is non-nil, and process is
2488 running when emacs is exited.
2490 :stop BOOL -- Start process in the `stopped' state if BOOL non-nil.
2491 In the stopped state, a server process does not accept new
2492 connections, and a client process does not handle incoming traffic.
2493 The stopped state is cleared by `continue-process' and set by
2494 `stop-process'.
2496 :filter FILTER -- Install FILTER as the process filter.
2498 :sentinel SENTINEL -- Install SENTINEL as the process sentinel.
2500 :log LOG -- Install LOG as the server process log function. This
2501 function is called as when the server accepts a network connection from a
2502 client. The arguments are SERVER, CLIENT, and MESSAGE, where SERVER
2503 is the server process, CLIENT is the new process for the connection,
2504 and MESSAGE is a string.
2506 :server BOOL -- if BOOL is non-nil, create a server process for the
2507 specified FAMILY, SERVICE, and connection type (stream or datagram).
2508 Default is a client process.
2510 A server process will listen for and accept connections from
2511 clients. When a client connection is accepted, a new network process
2512 is created for the connection with the following parameters:
2513 - The client's process name is constructed by concatenating the server
2514 process' NAME and a client identification string.
2515 - If the FILTER argument is non-nil, the client process will not get a
2516 separate process buffer; otherwise, the client's process buffer is a newly
2517 created buffer named after the server process' BUFFER name or process
2518 NAME concatenated with the client identification string.
2519 - The connection type and the process filter and sentinel parameters are
2520 inherited from the server process' TYPE, FILTER and SENTINEL.
2521 - The client process' contact info is set according to the client's
2522 addressing information (typically an IP address and a port number).
2524 Notice that the FILTER and SENTINEL args are never used directly by
2525 the server process. Also, the BUFFER argument is not used directly by
2526 the server process, but via `network-server-log-function' hook, a log
2527 of the accepted (and failed) connections may be recorded in the server
2528 process' buffer.
2530 usage: (make-network-process &rest ARGS) */)
2531 (nargs, args)
2532 int nargs;
2533 Lisp_Object *args;
2535 Lisp_Object proc;
2536 Lisp_Object contact;
2537 struct Lisp_Process *p;
2538 #ifdef HAVE_GETADDRINFO
2539 struct addrinfo ai, *res, *lres;
2540 struct addrinfo hints;
2541 char *portstring, portbuf[128];
2542 #else /* HAVE_GETADDRINFO */
2543 struct _emacs_addrinfo
2545 int ai_family;
2546 int ai_socktype;
2547 int ai_protocol;
2548 int ai_addrlen;
2549 struct sockaddr *ai_addr;
2550 struct _emacs_addrinfo *ai_next;
2551 } ai, *res, *lres;
2552 #endif /* HAVE_GETADDRINFO */
2553 struct sockaddr_in address_in;
2554 #ifdef HAVE_LOCAL_SOCKETS
2555 struct sockaddr_un address_un;
2556 #endif
2557 int port;
2558 int ret = 0;
2559 int xerrno = 0;
2560 int s = -1, outch, inch;
2561 struct gcpro gcpro1;
2562 int retry = 0;
2563 int count = SPECPDL_INDEX ();
2564 int count1;
2565 Lisp_Object QCaddress; /* one of QClocal or QCremote */
2566 Lisp_Object tem;
2567 Lisp_Object name, buffer, host, service, address;
2568 Lisp_Object filter, sentinel;
2569 int is_non_blocking_client = 0;
2570 int is_server = 0;
2571 int socktype;
2572 int family = -1;
2574 if (nargs == 0)
2575 return Qnil;
2577 /* Save arguments for process-contact and clone-process. */
2578 contact = Flist (nargs, args);
2579 GCPRO1 (contact);
2581 #ifdef WINDOWSNT
2582 /* Ensure socket support is loaded if available. */
2583 init_winsock (TRUE);
2584 #endif
2586 /* :type TYPE (nil: stream, datagram */
2587 tem = Fplist_get (contact, QCtype);
2588 if (NILP (tem))
2589 socktype = SOCK_STREAM;
2590 #ifdef DATAGRAM_SOCKETS
2591 else if (EQ (tem, Qdatagram))
2592 socktype = SOCK_DGRAM;
2593 #endif
2594 else
2595 error ("Unsupported connection type");
2597 /* :server BOOL */
2598 tem = Fplist_get (contact, QCserver);
2599 if (!NILP (tem))
2601 /* Don't support network sockets when non-blocking mode is
2602 not available, since a blocked Emacs is not useful. */
2603 #if defined(TERM) || (!defined(O_NONBLOCK) && !defined(O_NDELAY))
2604 error ("Network servers not supported");
2605 #else
2606 is_server = 1;
2607 #endif
2610 /* Make QCaddress an alias for :local (server) or :remote (client). */
2611 QCaddress = is_server ? QClocal : QCremote;
2613 /* :wait BOOL */
2614 if (!is_server && socktype == SOCK_STREAM
2615 && (tem = Fplist_get (contact, QCnowait), !NILP (tem)))
2617 #ifndef NON_BLOCKING_CONNECT
2618 error ("Non-blocking connect not supported");
2619 #else
2620 is_non_blocking_client = 1;
2621 #endif
2624 name = Fplist_get (contact, QCname);
2625 buffer = Fplist_get (contact, QCbuffer);
2626 filter = Fplist_get (contact, QCfilter);
2627 sentinel = Fplist_get (contact, QCsentinel);
2629 CHECK_STRING (name);
2631 #ifdef TERM
2632 /* Let's handle TERM before things get complicated ... */
2633 host = Fplist_get (contact, QChost);
2634 CHECK_STRING (host);
2636 service = Fplist_get (contact, QCservice);
2637 if (INTEGERP (service))
2638 port = htons ((unsigned short) XINT (service));
2639 else
2641 struct servent *svc_info;
2642 CHECK_STRING (service);
2643 svc_info = getservbyname (SDATA (service), "tcp");
2644 if (svc_info == 0)
2645 error ("Unknown service: %s", SDATA (service));
2646 port = svc_info->s_port;
2649 s = connect_server (0);
2650 if (s < 0)
2651 report_file_error ("error creating socket", Fcons (name, Qnil));
2652 send_command (s, C_PORT, 0, "%s:%d", SDATA (host), ntohs (port));
2653 send_command (s, C_DUMB, 1, 0);
2655 #else /* not TERM */
2657 /* Initialize addrinfo structure in case we don't use getaddrinfo. */
2658 ai.ai_socktype = socktype;
2659 ai.ai_protocol = 0;
2660 ai.ai_next = NULL;
2661 res = &ai;
2663 /* :local ADDRESS or :remote ADDRESS */
2664 address = Fplist_get (contact, QCaddress);
2665 if (!NILP (address))
2667 host = service = Qnil;
2669 if (!(ai.ai_addrlen = get_lisp_to_sockaddr_size (address, &family)))
2670 error ("Malformed :address");
2671 ai.ai_family = family;
2672 ai.ai_addr = alloca (ai.ai_addrlen);
2673 conv_lisp_to_sockaddr (family, address, ai.ai_addr, ai.ai_addrlen);
2674 goto open_socket;
2677 /* :family FAMILY -- nil (for Inet), local, or integer. */
2678 tem = Fplist_get (contact, QCfamily);
2679 if (INTEGERP (tem))
2680 family = XINT (tem);
2681 else
2683 if (NILP (tem))
2684 family = AF_INET;
2685 #ifdef HAVE_LOCAL_SOCKETS
2686 else if (EQ (tem, Qlocal))
2687 family = AF_LOCAL;
2688 #endif
2690 if (family < 0)
2691 error ("Unknown address family");
2692 ai.ai_family = family;
2694 /* :service SERVICE -- string, integer (port number), or t (random port). */
2695 service = Fplist_get (contact, QCservice);
2697 #ifdef HAVE_LOCAL_SOCKETS
2698 if (family == AF_LOCAL)
2700 /* Host is not used. */
2701 host = Qnil;
2702 CHECK_STRING (service);
2703 bzero (&address_un, sizeof address_un);
2704 address_un.sun_family = AF_LOCAL;
2705 strncpy (address_un.sun_path, SDATA (service), sizeof address_un.sun_path);
2706 ai.ai_addr = (struct sockaddr *) &address_un;
2707 ai.ai_addrlen = sizeof address_un;
2708 goto open_socket;
2710 #endif
2712 /* :host HOST -- hostname, ip address, or 'local for localhost. */
2713 host = Fplist_get (contact, QChost);
2714 if (!NILP (host))
2716 if (EQ (host, Qlocal))
2717 host = build_string ("localhost");
2718 CHECK_STRING (host);
2721 /* Slow down polling to every ten seconds.
2722 Some kernels have a bug which causes retrying connect to fail
2723 after a connect. Polling can interfere with gethostbyname too. */
2724 #ifdef POLL_FOR_INPUT
2725 if (socktype == SOCK_STREAM)
2727 record_unwind_protect (unwind_stop_other_atimers, Qnil);
2728 bind_polling_period (10);
2730 #endif
2732 #ifdef HAVE_GETADDRINFO
2733 /* If we have a host, use getaddrinfo to resolve both host and service.
2734 Otherwise, use getservbyname to lookup the service. */
2735 if (!NILP (host))
2738 /* SERVICE can either be a string or int.
2739 Convert to a C string for later use by getaddrinfo. */
2740 if (EQ (service, Qt))
2741 portstring = "0";
2742 else if (INTEGERP (service))
2744 sprintf (portbuf, "%ld", (long) XINT (service));
2745 portstring = portbuf;
2747 else
2749 CHECK_STRING (service);
2750 portstring = SDATA (service);
2753 immediate_quit = 1;
2754 QUIT;
2755 memset (&hints, 0, sizeof (hints));
2756 hints.ai_flags = 0;
2757 hints.ai_family = NILP (Fplist_member (contact, QCfamily)) ? AF_UNSPEC : family;
2758 hints.ai_socktype = socktype;
2759 hints.ai_protocol = 0;
2760 ret = getaddrinfo (SDATA (host), portstring, &hints, &res);
2761 if (ret)
2762 #ifdef HAVE_GAI_STRERROR
2763 error ("%s/%s %s", SDATA (host), portstring, gai_strerror(ret));
2764 #else
2765 error ("%s/%s getaddrinfo error %d", SDATA (host), portstring, ret);
2766 #endif
2767 immediate_quit = 0;
2769 goto open_socket;
2771 #endif /* HAVE_GETADDRINFO */
2773 /* We end up here if getaddrinfo is not defined, or in case no hostname
2774 has been specified (e.g. for a local server process). */
2776 if (EQ (service, Qt))
2777 port = 0;
2778 else if (INTEGERP (service))
2779 port = htons ((unsigned short) XINT (service));
2780 else
2782 struct servent *svc_info;
2783 CHECK_STRING (service);
2784 svc_info = getservbyname (SDATA (service),
2785 (socktype == SOCK_DGRAM ? "udp" : "tcp"));
2786 if (svc_info == 0)
2787 error ("Unknown service: %s", SDATA (service));
2788 port = svc_info->s_port;
2791 bzero (&address_in, sizeof address_in);
2792 address_in.sin_family = family;
2793 address_in.sin_addr.s_addr = INADDR_ANY;
2794 address_in.sin_port = port;
2796 #ifndef HAVE_GETADDRINFO
2797 if (!NILP (host))
2799 struct hostent *host_info_ptr;
2801 /* gethostbyname may fail with TRY_AGAIN, but we don't honour that,
2802 as it may `hang' emacs for a very long time. */
2803 immediate_quit = 1;
2804 QUIT;
2805 host_info_ptr = gethostbyname (SDATA (host));
2806 immediate_quit = 0;
2808 if (host_info_ptr)
2810 bcopy (host_info_ptr->h_addr, (char *) &address_in.sin_addr,
2811 host_info_ptr->h_length);
2812 family = host_info_ptr->h_addrtype;
2813 address_in.sin_family = family;
2815 else
2816 /* Attempt to interpret host as numeric inet address */
2818 IN_ADDR numeric_addr;
2819 numeric_addr = inet_addr ((char *) SDATA (host));
2820 if (NUMERIC_ADDR_ERROR)
2821 error ("Unknown host \"%s\"", SDATA (host));
2823 bcopy ((char *)&numeric_addr, (char *) &address_in.sin_addr,
2824 sizeof (address_in.sin_addr));
2828 #endif /* not HAVE_GETADDRINFO */
2830 ai.ai_family = family;
2831 ai.ai_addr = (struct sockaddr *) &address_in;
2832 ai.ai_addrlen = sizeof address_in;
2834 open_socket:
2836 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
2837 when connect is interrupted. So let's not let it get interrupted.
2838 Note we do not turn off polling, because polling is only used
2839 when not interrupt_input, and thus not normally used on the systems
2840 which have this bug. On systems which use polling, there's no way
2841 to quit if polling is turned off. */
2842 if (interrupt_input
2843 && !is_server && socktype == SOCK_STREAM)
2845 /* Comment from KFS: The original open-network-stream code
2846 didn't unwind protect this, but it seems like the proper
2847 thing to do. In any case, I don't see how it could harm to
2848 do this -- and it makes cleanup (using unbind_to) easier. */
2849 record_unwind_protect (unwind_request_sigio, Qnil);
2850 unrequest_sigio ();
2853 /* Do this in case we never enter the for-loop below. */
2854 count1 = SPECPDL_INDEX ();
2855 s = -1;
2857 for (lres = res; lres; lres = lres->ai_next)
2859 s = socket (lres->ai_family, lres->ai_socktype, lres->ai_protocol);
2860 if (s < 0)
2862 xerrno = errno;
2863 continue;
2866 #ifdef DATAGRAM_SOCKETS
2867 if (!is_server && socktype == SOCK_DGRAM)
2868 break;
2869 #endif /* DATAGRAM_SOCKETS */
2871 #ifdef NON_BLOCKING_CONNECT
2872 if (is_non_blocking_client)
2874 #ifdef O_NONBLOCK
2875 ret = fcntl (s, F_SETFL, O_NONBLOCK);
2876 #else
2877 ret = fcntl (s, F_SETFL, O_NDELAY);
2878 #endif
2879 if (ret < 0)
2881 xerrno = errno;
2882 emacs_close (s);
2883 s = -1;
2884 continue;
2887 #endif
2889 /* Make us close S if quit. */
2890 record_unwind_protect (close_file_unwind, make_number (s));
2892 if (is_server)
2894 /* Configure as a server socket. */
2895 #ifdef HAVE_LOCAL_SOCKETS
2896 if (family != AF_LOCAL)
2897 #endif
2899 int optval = 1;
2900 if (setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval))
2901 report_file_error ("Cannot set reuse option on server socket.", Qnil);
2904 if (bind (s, lres->ai_addr, lres->ai_addrlen))
2905 report_file_error ("Cannot bind server socket", Qnil);
2907 #ifdef HAVE_GETSOCKNAME
2908 if (EQ (service, Qt))
2910 struct sockaddr_in sa1;
2911 int len1 = sizeof (sa1);
2912 if (getsockname (s, (struct sockaddr *)&sa1, &len1) == 0)
2914 ((struct sockaddr_in *)(lres->ai_addr))->sin_port = sa1.sin_port;
2915 service = make_number (sa1.sin_port);
2916 contact = Fplist_put (contact, QCservice, service);
2919 #endif
2921 if (socktype == SOCK_STREAM && listen (s, 5))
2922 report_file_error ("Cannot listen on server socket", Qnil);
2924 break;
2927 retry_connect:
2929 immediate_quit = 1;
2930 QUIT;
2932 /* This turns off all alarm-based interrupts; the
2933 bind_polling_period call above doesn't always turn all the
2934 short-interval ones off, especially if interrupt_input is
2935 set.
2937 It'd be nice to be able to control the connect timeout
2938 though. Would non-blocking connect calls be portable?
2940 This used to be conditioned by HAVE_GETADDRINFO. Why? */
2942 turn_on_atimers (0);
2944 ret = connect (s, lres->ai_addr, lres->ai_addrlen);
2945 xerrno = errno;
2947 turn_on_atimers (1);
2949 if (ret == 0 || xerrno == EISCONN)
2951 /* The unwind-protect will be discarded afterwards.
2952 Likewise for immediate_quit. */
2953 break;
2956 #ifdef NON_BLOCKING_CONNECT
2957 #ifdef EINPROGRESS
2958 if (is_non_blocking_client && xerrno == EINPROGRESS)
2959 break;
2960 #else
2961 #ifdef EWOULDBLOCK
2962 if (is_non_blocking_client && xerrno == EWOULDBLOCK)
2963 break;
2964 #endif
2965 #endif
2966 #endif
2968 immediate_quit = 0;
2970 if (xerrno == EINTR)
2971 goto retry_connect;
2972 if (xerrno == EADDRINUSE && retry < 20)
2974 /* A delay here is needed on some FreeBSD systems,
2975 and it is harmless, since this retrying takes time anyway
2976 and should be infrequent. */
2977 Fsleep_for (make_number (1), Qnil);
2978 retry++;
2979 goto retry_connect;
2982 /* Discard the unwind protect closing S. */
2983 specpdl_ptr = specpdl + count1;
2984 emacs_close (s);
2985 s = -1;
2988 if (s >= 0)
2990 #ifdef DATAGRAM_SOCKETS
2991 if (socktype == SOCK_DGRAM)
2993 if (datagram_address[s].sa)
2994 abort ();
2995 datagram_address[s].sa = (struct sockaddr *) xmalloc (lres->ai_addrlen);
2996 datagram_address[s].len = lres->ai_addrlen;
2997 if (is_server)
2999 Lisp_Object remote;
3000 bzero (datagram_address[s].sa, lres->ai_addrlen);
3001 if (remote = Fplist_get (contact, QCremote), !NILP (remote))
3003 int rfamily, rlen;
3004 rlen = get_lisp_to_sockaddr_size (remote, &rfamily);
3005 if (rfamily == lres->ai_family && rlen == lres->ai_addrlen)
3006 conv_lisp_to_sockaddr (rfamily, remote,
3007 datagram_address[s].sa, rlen);
3010 else
3011 bcopy (lres->ai_addr, datagram_address[s].sa, lres->ai_addrlen);
3013 #endif
3014 contact = Fplist_put (contact, QCaddress,
3015 conv_sockaddr_to_lisp (lres->ai_addr, lres->ai_addrlen));
3018 #ifdef HAVE_GETADDRINFO
3019 if (res != &ai)
3020 freeaddrinfo (res);
3021 #endif
3023 immediate_quit = 0;
3025 /* Discard the unwind protect for closing S, if any. */
3026 specpdl_ptr = specpdl + count1;
3028 /* Unwind bind_polling_period and request_sigio. */
3029 unbind_to (count, Qnil);
3031 if (s < 0)
3033 /* If non-blocking got this far - and failed - assume non-blocking is
3034 not supported after all. This is probably a wrong assumption, but
3035 the normal blocking calls to open-network-stream handles this error
3036 better. */
3037 if (is_non_blocking_client)
3038 return Qnil;
3040 errno = xerrno;
3041 if (is_server)
3042 report_file_error ("make server process failed", contact);
3043 else
3044 report_file_error ("make client process failed", contact);
3047 tem = Fplist_get (contact, QCoptions);
3048 if (!NILP (tem))
3049 set_socket_options (s, tem, 1);
3051 #endif /* not TERM */
3053 inch = s;
3054 outch = s;
3056 if (!NILP (buffer))
3057 buffer = Fget_buffer_create (buffer);
3058 proc = make_process (name);
3060 chan_process[inch] = proc;
3062 #ifdef O_NONBLOCK
3063 fcntl (inch, F_SETFL, O_NONBLOCK);
3064 #else
3065 #ifdef O_NDELAY
3066 fcntl (inch, F_SETFL, O_NDELAY);
3067 #endif
3068 #endif
3070 p = XPROCESS (proc);
3072 p->childp = contact;
3073 p->buffer = buffer;
3074 p->sentinel = sentinel;
3075 p->filter = filter;
3076 p->log = Fplist_get (contact, QClog);
3077 if (tem = Fplist_get (contact, QCnoquery), !NILP (tem))
3078 p->kill_without_query = Qt;
3079 if ((tem = Fplist_get (contact, QCstop), !NILP (tem)))
3080 p->command = Qt;
3081 p->pid = Qnil;
3082 XSETINT (p->infd, inch);
3083 XSETINT (p->outfd, outch);
3084 if (is_server && socktype == SOCK_STREAM)
3085 p->status = Qlisten;
3087 #ifdef NON_BLOCKING_CONNECT
3088 if (is_non_blocking_client)
3090 /* We may get here if connect did succeed immediately. However,
3091 in that case, we still need to signal this like a non-blocking
3092 connection. */
3093 p->status = Qconnect;
3094 if (!FD_ISSET (inch, &connect_wait_mask))
3096 FD_SET (inch, &connect_wait_mask);
3097 num_pending_connects++;
3100 else
3101 #endif
3102 /* A server may have a client filter setting of Qt, but it must
3103 still listen for incoming connects unless it is stopped. */
3104 if ((!EQ (p->filter, Qt) && !EQ (p->command, Qt))
3105 || (EQ (p->status, Qlisten) && NILP (p->command)))
3107 FD_SET (inch, &input_wait_mask);
3108 FD_SET (inch, &non_keyboard_wait_mask);
3111 if (inch > max_process_desc)
3112 max_process_desc = inch;
3114 tem = Fplist_member (contact, QCcoding);
3115 if (!NILP (tem) && (!CONSP (tem) || !CONSP (XCDR (tem))))
3116 tem = Qnil; /* No error message (too late!). */
3119 /* Setup coding systems for communicating with the network stream. */
3120 struct gcpro gcpro1;
3121 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
3122 Lisp_Object coding_systems = Qt;
3123 Lisp_Object args[5], val;
3125 if (!NILP (tem))
3126 val = XCAR (XCDR (tem));
3127 else if (!NILP (Vcoding_system_for_read))
3128 val = Vcoding_system_for_read;
3129 else if ((!NILP (buffer) && NILP (XBUFFER (buffer)->enable_multibyte_characters))
3130 || (NILP (buffer) && NILP (buffer_defaults.enable_multibyte_characters)))
3131 /* We dare not decode end-of-line format by setting VAL to
3132 Qraw_text, because the existing Emacs Lisp libraries
3133 assume that they receive bare code including a sequene of
3134 CR LF. */
3135 val = Qnil;
3136 else
3138 args[0] = Qopen_network_stream, args[1] = name,
3139 args[2] = buffer, args[3] = host, args[4] = service;
3140 GCPRO1 (proc);
3141 coding_systems = Ffind_operation_coding_system (5, args);
3142 UNGCPRO;
3143 if (CONSP (coding_systems))
3144 val = XCAR (coding_systems);
3145 else if (CONSP (Vdefault_process_coding_system))
3146 val = XCAR (Vdefault_process_coding_system);
3147 else
3148 val = Qnil;
3150 p->decode_coding_system = val;
3152 if (!NILP (tem))
3153 val = XCAR (XCDR (tem));
3154 else if (!NILP (Vcoding_system_for_write))
3155 val = Vcoding_system_for_write;
3156 else if (NILP (current_buffer->enable_multibyte_characters))
3157 val = Qnil;
3158 else
3160 if (EQ (coding_systems, Qt))
3162 args[0] = Qopen_network_stream, args[1] = name,
3163 args[2] = buffer, args[3] = host, args[4] = service;
3164 GCPRO1 (proc);
3165 coding_systems = Ffind_operation_coding_system (5, args);
3166 UNGCPRO;
3168 if (CONSP (coding_systems))
3169 val = XCDR (coding_systems);
3170 else if (CONSP (Vdefault_process_coding_system))
3171 val = XCDR (Vdefault_process_coding_system);
3172 else
3173 val = Qnil;
3175 p->encode_coding_system = val;
3178 if (!proc_decode_coding_system[inch])
3179 proc_decode_coding_system[inch]
3180 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
3181 setup_coding_system (p->decode_coding_system,
3182 proc_decode_coding_system[inch]);
3183 if (!proc_encode_coding_system[outch])
3184 proc_encode_coding_system[outch]
3185 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
3186 setup_coding_system (p->encode_coding_system,
3187 proc_encode_coding_system[outch]);
3189 p->decoding_buf = make_uninit_string (0);
3190 p->decoding_carryover = make_number (0);
3191 p->encoding_buf = make_uninit_string (0);
3192 p->encoding_carryover = make_number (0);
3194 p->inherit_coding_system_flag
3195 = (!NILP (tem) || NILP (buffer) || !inherit_process_coding_system
3196 ? Qnil : Qt);
3198 UNGCPRO;
3199 return proc;
3201 #endif /* HAVE_SOCKETS */
3203 void
3204 deactivate_process (proc)
3205 Lisp_Object proc;
3207 register int inchannel, outchannel;
3208 register struct Lisp_Process *p = XPROCESS (proc);
3210 inchannel = XINT (p->infd);
3211 outchannel = XINT (p->outfd);
3213 if (inchannel >= 0)
3215 /* Beware SIGCHLD hereabouts. */
3216 flush_pending_output (inchannel);
3217 #ifdef VMS
3219 VMS_PROC_STUFF *get_vms_process_pointer (), *vs;
3220 sys$dassgn (outchannel);
3221 vs = get_vms_process_pointer (p->pid);
3222 if (vs)
3223 give_back_vms_process_stuff (vs);
3225 #else
3226 emacs_close (inchannel);
3227 if (outchannel >= 0 && outchannel != inchannel)
3228 emacs_close (outchannel);
3229 #endif
3231 XSETINT (p->infd, -1);
3232 XSETINT (p->outfd, -1);
3233 #ifdef DATAGRAM_SOCKETS
3234 if (DATAGRAM_CHAN_P (inchannel))
3236 xfree (datagram_address[inchannel].sa);
3237 datagram_address[inchannel].sa = 0;
3238 datagram_address[inchannel].len = 0;
3240 #endif
3241 chan_process[inchannel] = Qnil;
3242 FD_CLR (inchannel, &input_wait_mask);
3243 FD_CLR (inchannel, &non_keyboard_wait_mask);
3244 if (FD_ISSET (inchannel, &connect_wait_mask))
3246 FD_CLR (inchannel, &connect_wait_mask);
3247 if (--num_pending_connects < 0)
3248 abort ();
3250 if (inchannel == max_process_desc)
3252 int i;
3253 /* We just closed the highest-numbered process input descriptor,
3254 so recompute the highest-numbered one now. */
3255 max_process_desc = 0;
3256 for (i = 0; i < MAXDESC; i++)
3257 if (!NILP (chan_process[i]))
3258 max_process_desc = i;
3263 /* Close all descriptors currently in use for communication
3264 with subprocess. This is used in a newly-forked subprocess
3265 to get rid of irrelevant descriptors. */
3267 void
3268 close_process_descs ()
3270 #ifndef WINDOWSNT
3271 int i;
3272 for (i = 0; i < MAXDESC; i++)
3274 Lisp_Object process;
3275 process = chan_process[i];
3276 if (!NILP (process))
3278 int in = XINT (XPROCESS (process)->infd);
3279 int out = XINT (XPROCESS (process)->outfd);
3280 if (in >= 0)
3281 emacs_close (in);
3282 if (out >= 0 && in != out)
3283 emacs_close (out);
3286 #endif
3289 DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output,
3290 0, 3, 0,
3291 doc: /* Allow any pending output from subprocesses to be read by Emacs.
3292 It is read into the process' buffers or given to their filter functions.
3293 Non-nil arg PROCESS means do not return until some output has been received
3294 from PROCESS.
3295 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of
3296 seconds and microseconds to wait; return after that much time whether
3297 or not there is input.
3298 Return non-nil iff we received any output before the timeout expired. */)
3299 (process, timeout, timeout_msecs)
3300 register Lisp_Object process, timeout, timeout_msecs;
3302 int seconds;
3303 int useconds;
3305 if (! NILP (process))
3306 CHECK_PROCESS (process);
3308 if (! NILP (timeout_msecs))
3310 CHECK_NUMBER (timeout_msecs);
3311 useconds = XINT (timeout_msecs);
3312 if (!INTEGERP (timeout))
3313 XSETINT (timeout, 0);
3316 int carry = useconds / 1000000;
3318 XSETINT (timeout, XINT (timeout) + carry);
3319 useconds -= carry * 1000000;
3321 /* I think this clause is necessary because C doesn't
3322 guarantee a particular rounding direction for negative
3323 integers. */
3324 if (useconds < 0)
3326 XSETINT (timeout, XINT (timeout) - 1);
3327 useconds += 1000000;
3331 else
3332 useconds = 0;
3334 if (! NILP (timeout))
3336 CHECK_NUMBER (timeout);
3337 seconds = XINT (timeout);
3338 if (seconds < 0 || (seconds == 0 && useconds == 0))
3339 seconds = -1;
3341 else
3343 if (NILP (process))
3344 seconds = -1;
3345 else
3346 seconds = 0;
3349 if (NILP (process))
3350 XSETFASTINT (process, 0);
3352 return
3353 (wait_reading_process_input (seconds, useconds, process, 0)
3354 ? Qt : Qnil);
3357 /* Accept a connection for server process SERVER on CHANNEL. */
3359 static int connect_counter = 0;
3361 static void
3362 server_accept_connection (server, channel)
3363 Lisp_Object server;
3364 int channel;
3366 Lisp_Object proc, caller, name, buffer;
3367 Lisp_Object contact, host, service;
3368 struct Lisp_Process *ps= XPROCESS (server);
3369 struct Lisp_Process *p;
3370 int s;
3371 union u_sockaddr {
3372 struct sockaddr sa;
3373 struct sockaddr_in in;
3374 #ifdef HAVE_LOCAL_SOCKETS
3375 struct sockaddr_un un;
3376 #endif
3377 } saddr;
3378 int len = sizeof saddr;
3380 s = accept (channel, &saddr.sa, &len);
3382 if (s < 0)
3384 int code = errno;
3386 if (code == EAGAIN)
3387 return;
3388 #ifdef EWOULDBLOCK
3389 if (code == EWOULDBLOCK)
3390 return;
3391 #endif
3393 if (!NILP (ps->log))
3394 call3 (ps->log, server, Qnil,
3395 concat3 (build_string ("accept failed with code"),
3396 Fnumber_to_string (make_number (code)),
3397 build_string ("\n")));
3398 return;
3401 connect_counter++;
3403 /* Setup a new process to handle the connection. */
3405 /* Generate a unique identification of the caller, and build contact
3406 information for this process. */
3407 host = Qt;
3408 service = Qnil;
3409 switch (saddr.sa.sa_family)
3411 case AF_INET:
3413 Lisp_Object args[5];
3414 unsigned char *ip = (unsigned char *)&saddr.in.sin_addr.s_addr;
3415 args[0] = build_string ("%d.%d.%d.%d");
3416 args[1] = make_number (*ip++);
3417 args[2] = make_number (*ip++);
3418 args[3] = make_number (*ip++);
3419 args[4] = make_number (*ip++);
3420 host = Fformat (5, args);
3421 service = make_number (ntohs (saddr.in.sin_port));
3423 args[0] = build_string (" <%s:%d>");
3424 args[1] = host;
3425 args[2] = service;
3426 caller = Fformat (3, args);
3428 break;
3430 #ifdef HAVE_LOCAL_SOCKETS
3431 case AF_LOCAL:
3432 #endif
3433 default:
3434 caller = Fnumber_to_string (make_number (connect_counter));
3435 caller = concat3 (build_string (" <*"), caller, build_string ("*>"));
3436 break;
3439 /* Create a new buffer name for this process if it doesn't have a
3440 filter. The new buffer name is based on the buffer name or
3441 process name of the server process concatenated with the caller
3442 identification. */
3444 if (!NILP (ps->filter) && !EQ (ps->filter, Qt))
3445 buffer = Qnil;
3446 else
3448 buffer = ps->buffer;
3449 if (!NILP (buffer))
3450 buffer = Fbuffer_name (buffer);
3451 else
3452 buffer = ps->name;
3453 if (!NILP (buffer))
3455 buffer = concat2 (buffer, caller);
3456 buffer = Fget_buffer_create (buffer);
3460 /* Generate a unique name for the new server process. Combine the
3461 server process name with the caller identification. */
3463 name = concat2 (ps->name, caller);
3464 proc = make_process (name);
3466 chan_process[s] = proc;
3468 #ifdef O_NONBLOCK
3469 fcntl (s, F_SETFL, O_NONBLOCK);
3470 #else
3471 #ifdef O_NDELAY
3472 fcntl (s, F_SETFL, O_NDELAY);
3473 #endif
3474 #endif
3476 p = XPROCESS (proc);
3478 /* Build new contact information for this setup. */
3479 contact = Fcopy_sequence (ps->childp);
3480 contact = Fplist_put (contact, QCserver, Qnil);
3481 contact = Fplist_put (contact, QChost, host);
3482 if (!NILP (service))
3483 contact = Fplist_put (contact, QCservice, service);
3484 contact = Fplist_put (contact, QCremote,
3485 conv_sockaddr_to_lisp (&saddr.sa, len));
3486 #ifdef HAVE_GETSOCKNAME
3487 len = sizeof saddr;
3488 if (getsockname (channel, &saddr.sa, &len) == 0)
3489 contact = Fplist_put (contact, QClocal,
3490 conv_sockaddr_to_lisp (&saddr.sa, len));
3491 #endif
3493 p->childp = contact;
3494 p->buffer = buffer;
3495 p->sentinel = ps->sentinel;
3496 p->filter = ps->filter;
3497 p->command = Qnil;
3498 p->pid = Qnil;
3499 XSETINT (p->infd, s);
3500 XSETINT (p->outfd, s);
3501 p->status = Qrun;
3503 /* Client processes for accepted connections are not stopped initially. */
3504 if (!EQ (p->filter, Qt))
3506 FD_SET (s, &input_wait_mask);
3507 FD_SET (s, &non_keyboard_wait_mask);
3510 if (s > max_process_desc)
3511 max_process_desc = s;
3513 /* Setup coding system for new process based on server process.
3514 This seems to be the proper thing to do, as the coding system
3515 of the new process should reflect the settings at the time the
3516 server socket was opened; not the current settings. */
3518 p->decode_coding_system = ps->decode_coding_system;
3519 p->encode_coding_system = ps->encode_coding_system;
3521 if (!proc_decode_coding_system[s])
3522 proc_decode_coding_system[s]
3523 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
3524 setup_coding_system (p->decode_coding_system,
3525 proc_decode_coding_system[s]);
3526 if (!proc_encode_coding_system[s])
3527 proc_encode_coding_system[s]
3528 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
3529 setup_coding_system (p->encode_coding_system,
3530 proc_encode_coding_system[s]);
3532 p->decoding_buf = make_uninit_string (0);
3533 p->decoding_carryover = make_number (0);
3534 p->encoding_buf = make_uninit_string (0);
3535 p->encoding_carryover = make_number (0);
3537 p->inherit_coding_system_flag
3538 = (NILP (buffer) ? Qnil : ps->inherit_coding_system_flag);
3540 if (!NILP (ps->log))
3541 call3 (ps->log, server, proc,
3542 concat3 (build_string ("accept from "),
3543 (STRINGP (host) ? host : build_string ("-")),
3544 build_string ("\n")));
3546 if (!NILP (p->sentinel))
3547 exec_sentinel (proc,
3548 concat3 (build_string ("open from "),
3549 (STRINGP (host) ? host : build_string ("-")),
3550 build_string ("\n")));
3553 /* This variable is different from waiting_for_input in keyboard.c.
3554 It is used to communicate to a lisp process-filter/sentinel (via the
3555 function Fwaiting_for_user_input_p below) whether emacs was waiting
3556 for user-input when that process-filter was called.
3557 waiting_for_input cannot be used as that is by definition 0 when
3558 lisp code is being evalled.
3559 This is also used in record_asynch_buffer_change.
3560 For that purpose, this must be 0
3561 when not inside wait_reading_process_input. */
3562 static int waiting_for_user_input_p;
3564 /* This is here so breakpoints can be put on it. */
3565 static void
3566 wait_reading_process_input_1 ()
3570 /* Read and dispose of subprocess output while waiting for timeout to
3571 elapse and/or keyboard input to be available.
3573 TIME_LIMIT is:
3574 timeout in seconds, or
3575 zero for no limit, or
3576 -1 means gobble data immediately available but don't wait for any.
3578 MICROSECS is:
3579 an additional duration to wait, measured in microseconds.
3580 If this is nonzero and time_limit is 0, then the timeout
3581 consists of MICROSECS only.
3583 READ_KBD is a lisp value:
3584 0 to ignore keyboard input, or
3585 1 to return when input is available, or
3586 -1 meaning caller will actually read the input, so don't throw to
3587 the quit handler, or
3588 a cons cell, meaning wait until its car is non-nil
3589 (and gobble terminal input into the buffer if any arrives), or
3590 a process object, meaning wait until something arrives from that
3591 process. The return value is true iff we read some input from
3592 that process.
3594 DO_DISPLAY != 0 means redisplay should be done to show subprocess
3595 output that arrives.
3597 If READ_KBD is a pointer to a struct Lisp_Process, then the
3598 function returns true iff we received input from that process
3599 before the timeout elapsed.
3600 Otherwise, return true iff we received input from any process. */
3603 wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
3604 int time_limit, microsecs;
3605 Lisp_Object read_kbd;
3606 int do_display;
3608 register int channel, nfds;
3609 static SELECT_TYPE Available;
3610 static SELECT_TYPE Connecting;
3611 int check_connect, no_avail;
3612 int xerrno;
3613 Lisp_Object proc;
3614 EMACS_TIME timeout, end_time;
3615 int wait_channel = -1;
3616 struct Lisp_Process *wait_proc = 0;
3617 int got_some_input = 0;
3618 /* Either nil or a cons cell, the car of which is of interest and
3619 may be changed outside of this routine. */
3620 Lisp_Object wait_for_cell = Qnil;
3622 FD_ZERO (&Available);
3623 FD_ZERO (&Connecting);
3625 /* If read_kbd is a process to watch, set wait_proc and wait_channel
3626 accordingly. */
3627 if (PROCESSP (read_kbd))
3629 wait_proc = XPROCESS (read_kbd);
3630 wait_channel = XINT (wait_proc->infd);
3631 XSETFASTINT (read_kbd, 0);
3634 /* If waiting for non-nil in a cell, record where. */
3635 if (CONSP (read_kbd))
3637 wait_for_cell = read_kbd;
3638 XSETFASTINT (read_kbd, 0);
3641 waiting_for_user_input_p = XINT (read_kbd);
3643 /* Since we may need to wait several times,
3644 compute the absolute time to return at. */
3645 if (time_limit || microsecs)
3647 EMACS_GET_TIME (end_time);
3648 EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
3649 EMACS_ADD_TIME (end_time, end_time, timeout);
3651 #ifdef hpux
3652 /* AlainF 5-Jul-1996
3653 HP-UX 10.10 seem to have problems with signals coming in
3654 Causes "poll: interrupted system call" messages when Emacs is run
3655 in an X window
3656 Turn off periodic alarms (in case they are in use),
3657 and then turn off any other atimers. */
3658 stop_polling ();
3659 turn_on_atimers (0);
3660 #endif
3662 while (1)
3664 int timeout_reduced_for_timers = 0;
3666 /* If calling from keyboard input, do not quit
3667 since we want to return C-g as an input character.
3668 Otherwise, do pending quit if requested. */
3669 if (XINT (read_kbd) >= 0)
3670 QUIT;
3672 /* Exit now if the cell we're waiting for became non-nil. */
3673 if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
3674 break;
3676 /* Compute time from now till when time limit is up */
3677 /* Exit if already run out */
3678 if (time_limit == -1)
3680 /* -1 specified for timeout means
3681 gobble output available now
3682 but don't wait at all. */
3684 EMACS_SET_SECS_USECS (timeout, 0, 0);
3686 else if (time_limit || microsecs)
3688 EMACS_GET_TIME (timeout);
3689 EMACS_SUB_TIME (timeout, end_time, timeout);
3690 if (EMACS_TIME_NEG_P (timeout))
3691 break;
3693 else
3695 EMACS_SET_SECS_USECS (timeout, 100000, 0);
3698 /* Normally we run timers here.
3699 But not if wait_for_cell; in those cases,
3700 the wait is supposed to be short,
3701 and those callers cannot handle running arbitrary Lisp code here. */
3702 if (NILP (wait_for_cell))
3704 EMACS_TIME timer_delay;
3708 int old_timers_run = timers_run;
3709 struct buffer *old_buffer = current_buffer;
3711 timer_delay = timer_check (1);
3713 /* If a timer has run, this might have changed buffers
3714 an alike. Make read_key_sequence aware of that. */
3715 if (timers_run != old_timers_run
3716 && old_buffer != current_buffer
3717 && waiting_for_user_input_p == -1)
3718 record_asynch_buffer_change ();
3720 if (timers_run != old_timers_run && do_display)
3721 /* We must retry, since a timer may have requeued itself
3722 and that could alter the time_delay. */
3723 redisplay_preserve_echo_area (9);
3724 else
3725 break;
3727 while (!detect_input_pending ());
3729 /* If there is unread keyboard input, also return. */
3730 if (XINT (read_kbd) != 0
3731 && requeued_events_pending_p ())
3732 break;
3734 if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
3736 EMACS_TIME difference;
3737 EMACS_SUB_TIME (difference, timer_delay, timeout);
3738 if (EMACS_TIME_NEG_P (difference))
3740 timeout = timer_delay;
3741 timeout_reduced_for_timers = 1;
3744 /* If time_limit is -1, we are not going to wait at all. */
3745 else if (time_limit != -1)
3747 /* This is so a breakpoint can be put here. */
3748 wait_reading_process_input_1 ();
3752 /* Cause C-g and alarm signals to take immediate action,
3753 and cause input available signals to zero out timeout.
3755 It is important that we do this before checking for process
3756 activity. If we get a SIGCHLD after the explicit checks for
3757 process activity, timeout is the only way we will know. */
3758 if (XINT (read_kbd) < 0)
3759 set_waiting_for_input (&timeout);
3761 /* If status of something has changed, and no input is
3762 available, notify the user of the change right away. After
3763 this explicit check, we'll let the SIGCHLD handler zap
3764 timeout to get our attention. */
3765 if (update_tick != process_tick && do_display)
3767 SELECT_TYPE Atemp, Ctemp;
3769 Atemp = input_wait_mask;
3770 #ifdef MAC_OSX
3771 /* On Mac OS X, the SELECT system call always says input is
3772 present (for reading) at stdin, even when none is. This
3773 causes the call to SELECT below to return 1 and
3774 status_notify not to be called. As a result output of
3775 subprocesses are incorrectly discarded. */
3776 FD_CLR (0, &Atemp);
3777 #endif
3778 Ctemp = connect_wait_mask;
3779 EMACS_SET_SECS_USECS (timeout, 0, 0);
3780 if ((select (max (max_process_desc, max_keyboard_desc) + 1,
3781 &Atemp,
3782 (num_pending_connects > 0 ? &Ctemp : (SELECT_TYPE *)0),
3783 (SELECT_TYPE *)0, &timeout)
3784 <= 0))
3786 /* It's okay for us to do this and then continue with
3787 the loop, since timeout has already been zeroed out. */
3788 clear_waiting_for_input ();
3789 status_notify ();
3793 /* Don't wait for output from a non-running process. Just
3794 read whatever data has already been received. */
3795 if (wait_proc != 0 && !NILP (wait_proc->raw_status_low))
3796 update_status (wait_proc);
3797 if (wait_proc != 0
3798 && ! EQ (wait_proc->status, Qrun)
3799 && ! EQ (wait_proc->status, Qconnect))
3801 int nread, total_nread = 0;
3803 clear_waiting_for_input ();
3804 XSETPROCESS (proc, wait_proc);
3806 /* Read data from the process, until we exhaust it. */
3807 while (XINT (wait_proc->infd) >= 0)
3809 nread = read_process_output (proc, XINT (wait_proc->infd));
3811 if (nread == 0)
3812 break;
3814 if (0 < nread)
3815 total_nread += nread;
3816 #ifdef EIO
3817 else if (nread == -1 && EIO == errno)
3818 break;
3819 #endif
3820 #ifdef EAGAIN
3821 else if (nread == -1 && EAGAIN == errno)
3822 break;
3823 #endif
3824 #ifdef EWOULDBLOCK
3825 else if (nread == -1 && EWOULDBLOCK == errno)
3826 break;
3827 #endif
3829 if (total_nread > 0 && do_display)
3830 redisplay_preserve_echo_area (10);
3832 break;
3835 /* Wait till there is something to do */
3837 if (!NILP (wait_for_cell))
3839 Available = non_process_wait_mask;
3840 check_connect = 0;
3842 else
3844 if (! XINT (read_kbd))
3845 Available = non_keyboard_wait_mask;
3846 else
3847 Available = input_wait_mask;
3848 check_connect = (num_pending_connects > 0);
3851 /* If frame size has changed or the window is newly mapped,
3852 redisplay now, before we start to wait. There is a race
3853 condition here; if a SIGIO arrives between now and the select
3854 and indicates that a frame is trashed, the select may block
3855 displaying a trashed screen. */
3856 if (frame_garbaged && do_display)
3858 clear_waiting_for_input ();
3859 redisplay_preserve_echo_area (11);
3860 if (XINT (read_kbd) < 0)
3861 set_waiting_for_input (&timeout);
3864 no_avail = 0;
3865 if (XINT (read_kbd) && detect_input_pending ())
3867 nfds = 0;
3868 no_avail = 1;
3870 else
3872 if (check_connect)
3873 Connecting = connect_wait_mask;
3874 nfds = select (max (max_process_desc, max_keyboard_desc) + 1,
3875 &Available,
3876 (check_connect ? &Connecting : (SELECT_TYPE *)0),
3877 (SELECT_TYPE *)0, &timeout);
3880 xerrno = errno;
3882 /* Make C-g and alarm signals set flags again */
3883 clear_waiting_for_input ();
3885 /* If we woke up due to SIGWINCH, actually change size now. */
3886 do_pending_window_change (0);
3888 if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
3889 /* We wanted the full specified time, so return now. */
3890 break;
3891 if (nfds < 0)
3893 if (xerrno == EINTR)
3894 no_avail = 1;
3895 #ifdef ultrix
3896 /* Ultrix select seems to return ENOMEM when it is
3897 interrupted. Treat it just like EINTR. Bleah. Note
3898 that we want to test for the "ultrix" CPP symbol, not
3899 "__ultrix__"; the latter is only defined under GCC, but
3900 not by DEC's bundled CC. -JimB */
3901 else if (xerrno == ENOMEM)
3902 no_avail = 1;
3903 #endif
3904 #ifdef ALLIANT
3905 /* This happens for no known reason on ALLIANT.
3906 I am guessing that this is the right response. -- RMS. */
3907 else if (xerrno == EFAULT)
3908 no_avail = 1;
3909 #endif
3910 else if (xerrno == EBADF)
3912 #ifdef AIX
3913 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
3914 the child's closure of the pts gives the parent a SIGHUP, and
3915 the ptc file descriptor is automatically closed,
3916 yielding EBADF here or at select() call above.
3917 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
3918 in m/ibmrt-aix.h), and here we just ignore the select error.
3919 Cleanup occurs c/o status_notify after SIGCLD. */
3920 no_avail = 1; /* Cannot depend on values returned */
3921 #else
3922 abort ();
3923 #endif
3925 else
3926 error ("select error: %s", emacs_strerror (xerrno));
3929 if (no_avail)
3931 FD_ZERO (&Available);
3932 check_connect = 0;
3935 #if defined(sun) && !defined(USG5_4)
3936 if (nfds > 0 && keyboard_bit_set (&Available)
3937 && interrupt_input)
3938 /* System sometimes fails to deliver SIGIO.
3940 David J. Mackenzie says that Emacs doesn't compile under
3941 Solaris if this code is enabled, thus the USG5_4 in the CPP
3942 conditional. "I haven't noticed any ill effects so far.
3943 If you find a Solaris expert somewhere, they might know
3944 better." */
3945 kill (getpid (), SIGIO);
3946 #endif
3948 #if 0 /* When polling is used, interrupt_input is 0,
3949 so get_input_pending should read the input.
3950 So this should not be needed. */
3951 /* If we are using polling for input,
3952 and we see input available, make it get read now.
3953 Otherwise it might not actually get read for a second.
3954 And on hpux, since we turn off polling in wait_reading_process_input,
3955 it might never get read at all if we don't spend much time
3956 outside of wait_reading_process_input. */
3957 if (XINT (read_kbd) && interrupt_input
3958 && keyboard_bit_set (&Available)
3959 && input_polling_used ())
3960 kill (getpid (), SIGALRM);
3961 #endif
3963 /* Check for keyboard input */
3964 /* If there is any, return immediately
3965 to give it higher priority than subprocesses */
3967 if (XINT (read_kbd) != 0)
3969 int old_timers_run = timers_run;
3970 struct buffer *old_buffer = current_buffer;
3971 int leave = 0;
3973 if (detect_input_pending_run_timers (do_display))
3975 swallow_events (do_display);
3976 if (detect_input_pending_run_timers (do_display))
3977 leave = 1;
3980 /* If a timer has run, this might have changed buffers
3981 an alike. Make read_key_sequence aware of that. */
3982 if (timers_run != old_timers_run
3983 && waiting_for_user_input_p == -1
3984 && old_buffer != current_buffer)
3985 record_asynch_buffer_change ();
3987 if (leave)
3988 break;
3991 /* If there is unread keyboard input, also return. */
3992 if (XINT (read_kbd) != 0
3993 && requeued_events_pending_p ())
3994 break;
3996 /* If we are not checking for keyboard input now,
3997 do process events (but don't run any timers).
3998 This is so that X events will be processed.
3999 Otherwise they may have to wait until polling takes place.
4000 That would causes delays in pasting selections, for example.
4002 (We used to do this only if wait_for_cell.) */
4003 if (XINT (read_kbd) == 0 && detect_input_pending ())
4005 swallow_events (do_display);
4006 #if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */
4007 if (detect_input_pending ())
4008 break;
4009 #endif
4012 /* Exit now if the cell we're waiting for became non-nil. */
4013 if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
4014 break;
4016 #ifdef SIGIO
4017 /* If we think we have keyboard input waiting, but didn't get SIGIO,
4018 go read it. This can happen with X on BSD after logging out.
4019 In that case, there really is no input and no SIGIO,
4020 but select says there is input. */
4022 if (XINT (read_kbd) && interrupt_input
4023 && keyboard_bit_set (&Available))
4024 kill (getpid (), SIGIO);
4025 #endif
4027 if (! wait_proc)
4028 got_some_input |= nfds > 0;
4030 /* If checking input just got us a size-change event from X,
4031 obey it now if we should. */
4032 if (XINT (read_kbd) || ! NILP (wait_for_cell))
4033 do_pending_window_change (0);
4035 /* Check for data from a process. */
4036 if (no_avail || nfds == 0)
4037 continue;
4039 /* Really FIRST_PROC_DESC should be 0 on Unix,
4040 but this is safer in the short run. */
4041 for (channel = 0; channel <= max_process_desc; channel++)
4043 if (FD_ISSET (channel, &Available)
4044 && FD_ISSET (channel, &non_keyboard_wait_mask))
4046 int nread;
4048 /* If waiting for this channel, arrange to return as
4049 soon as no more input to be processed. No more
4050 waiting. */
4051 if (wait_channel == channel)
4053 wait_channel = -1;
4054 time_limit = -1;
4055 got_some_input = 1;
4057 proc = chan_process[channel];
4058 if (NILP (proc))
4059 continue;
4061 /* If this is a server stream socket, accept connection. */
4062 if (EQ (XPROCESS (proc)->status, Qlisten))
4064 server_accept_connection (proc, channel);
4065 continue;
4068 /* Read data from the process, starting with our
4069 buffered-ahead character if we have one. */
4071 nread = read_process_output (proc, channel);
4072 if (nread > 0)
4074 /* Since read_process_output can run a filter,
4075 which can call accept-process-output,
4076 don't try to read from any other processes
4077 before doing the select again. */
4078 FD_ZERO (&Available);
4080 if (do_display)
4081 redisplay_preserve_echo_area (12);
4083 #ifdef EWOULDBLOCK
4084 else if (nread == -1 && errno == EWOULDBLOCK)
4086 #endif
4087 /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
4088 and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */
4089 #ifdef O_NONBLOCK
4090 else if (nread == -1 && errno == EAGAIN)
4092 #else
4093 #ifdef O_NDELAY
4094 else if (nread == -1 && errno == EAGAIN)
4096 /* Note that we cannot distinguish between no input
4097 available now and a closed pipe.
4098 With luck, a closed pipe will be accompanied by
4099 subprocess termination and SIGCHLD. */
4100 else if (nread == 0 && !NETCONN_P (proc))
4102 #endif /* O_NDELAY */
4103 #endif /* O_NONBLOCK */
4104 #ifdef HAVE_PTYS
4105 /* On some OSs with ptys, when the process on one end of
4106 a pty exits, the other end gets an error reading with
4107 errno = EIO instead of getting an EOF (0 bytes read).
4108 Therefore, if we get an error reading and errno =
4109 EIO, just continue, because the child process has
4110 exited and should clean itself up soon (e.g. when we
4111 get a SIGCHLD).
4113 However, it has been known to happen that the SIGCHLD
4114 got lost. So raise the signl again just in case.
4115 It can't hurt. */
4116 else if (nread == -1 && errno == EIO)
4117 kill (getpid (), SIGCHLD);
4118 #endif /* HAVE_PTYS */
4119 /* If we can detect process termination, don't consider the process
4120 gone just because its pipe is closed. */
4121 #ifdef SIGCHLD
4122 else if (nread == 0 && !NETCONN_P (proc))
4124 #endif
4125 else
4127 /* Preserve status of processes already terminated. */
4128 XSETINT (XPROCESS (proc)->tick, ++process_tick);
4129 deactivate_process (proc);
4130 if (!NILP (XPROCESS (proc)->raw_status_low))
4131 update_status (XPROCESS (proc));
4132 if (EQ (XPROCESS (proc)->status, Qrun))
4133 XPROCESS (proc)->status
4134 = Fcons (Qexit, Fcons (make_number (256), Qnil));
4137 #ifdef NON_BLOCKING_CONNECT
4138 if (check_connect && FD_ISSET (channel, &Connecting))
4140 struct Lisp_Process *p;
4142 FD_CLR (channel, &connect_wait_mask);
4143 if (--num_pending_connects < 0)
4144 abort ();
4146 proc = chan_process[channel];
4147 if (NILP (proc))
4148 continue;
4150 p = XPROCESS (proc);
4152 #ifdef GNU_LINUX
4153 /* getsockopt(,,SO_ERROR,,) is said to hang on some systems.
4154 So only use it on systems where it is known to work. */
4156 int xlen = sizeof(xerrno);
4157 if (getsockopt(channel, SOL_SOCKET, SO_ERROR, &xerrno, &xlen))
4158 xerrno = errno;
4160 #else
4162 struct sockaddr pname;
4163 int pnamelen = sizeof(pname);
4165 /* If connection failed, getpeername will fail. */
4166 xerrno = 0;
4167 if (getpeername(channel, &pname, &pnamelen) < 0)
4169 /* Obtain connect failure code through error slippage. */
4170 char dummy;
4171 xerrno = errno;
4172 if (errno == ENOTCONN && read(channel, &dummy, 1) < 0)
4173 xerrno = errno;
4176 #endif
4177 if (xerrno)
4179 XSETINT (p->tick, ++process_tick);
4180 p->status = Fcons (Qfailed, Fcons (make_number (xerrno), Qnil));
4181 deactivate_process (proc);
4183 else
4185 p->status = Qrun;
4186 /* Execute the sentinel here. If we had relied on
4187 status_notify to do it later, it will read input
4188 from the process before calling the sentinel. */
4189 exec_sentinel (proc, build_string ("open\n"));
4190 if (!EQ (p->filter, Qt) && !EQ (p->command, Qt))
4192 FD_SET (XINT (p->infd), &input_wait_mask);
4193 FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
4197 #endif /* NON_BLOCKING_CONNECT */
4198 } /* end for each file descriptor */
4199 } /* end while exit conditions not met */
4201 waiting_for_user_input_p = 0;
4203 /* If calling from keyboard input, do not quit
4204 since we want to return C-g as an input character.
4205 Otherwise, do pending quit if requested. */
4206 if (XINT (read_kbd) >= 0)
4208 /* Prevent input_pending from remaining set if we quit. */
4209 clear_input_pending ();
4210 QUIT;
4212 #ifdef hpux
4213 /* AlainF 5-Jul-1996
4214 HP-UX 10.10 seems to have problems with signals coming in
4215 Causes "poll: interrupted system call" messages when Emacs is run
4216 in an X window
4217 Turn periodic alarms back on */
4218 start_polling ();
4219 #endif
4221 return got_some_input;
4224 /* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */
4226 static Lisp_Object
4227 read_process_output_call (fun_and_args)
4228 Lisp_Object fun_and_args;
4230 return apply1 (XCAR (fun_and_args), XCDR (fun_and_args));
4233 static Lisp_Object
4234 read_process_output_error_handler (error)
4235 Lisp_Object error;
4237 cmd_error_internal (error, "error in process filter: ");
4238 Vinhibit_quit = Qt;
4239 update_echo_area ();
4240 Fsleep_for (make_number (2), Qnil);
4241 return Qt;
4244 /* Read pending output from the process channel,
4245 starting with our buffered-ahead character if we have one.
4246 Yield number of decoded characters read.
4248 This function reads at most 1024 characters.
4249 If you want to read all available subprocess output,
4250 you must call it repeatedly until it returns zero.
4252 The characters read are decoded according to PROC's coding-system
4253 for decoding. */
4256 read_process_output (proc, channel)
4257 Lisp_Object proc;
4258 register int channel;
4260 register int nchars, nbytes;
4261 char *chars;
4262 register Lisp_Object outstream;
4263 register struct buffer *old = current_buffer;
4264 register struct Lisp_Process *p = XPROCESS (proc);
4265 register int opoint;
4266 struct coding_system *coding = proc_decode_coding_system[channel];
4267 int carryover = XINT (p->decoding_carryover);
4268 int readmax = 1024;
4270 #ifdef VMS
4271 VMS_PROC_STUFF *vs, *get_vms_process_pointer();
4273 vs = get_vms_process_pointer (p->pid);
4274 if (vs)
4276 if (!vs->iosb[0])
4277 return (0); /* Really weird if it does this */
4278 if (!(vs->iosb[0] & 1))
4279 return -1; /* I/O error */
4281 else
4282 error ("Could not get VMS process pointer");
4283 chars = vs->inputBuffer;
4284 nbytes = clean_vms_buffer (chars, vs->iosb[1]);
4285 if (nbytes <= 0)
4287 start_vms_process_read (vs); /* Crank up the next read on the process */
4288 return 1; /* Nothing worth printing, say we got 1 */
4290 if (carryover > 0)
4292 /* The data carried over in the previous decoding (which are at
4293 the tail of decoding buffer) should be prepended to the new
4294 data read to decode all together. */
4295 chars = (char *) alloca (nbytes + carryover);
4296 bcopy (SDATA (p->decoding_buf), buf, carryover);
4297 bcopy (vs->inputBuffer, chars + carryover, nbytes);
4299 #else /* not VMS */
4301 #ifdef DATAGRAM_SOCKETS
4302 /* A datagram is one packet; allow at least 1500+ bytes of data
4303 corresponding to the typical Ethernet frame size. */
4304 if (DATAGRAM_CHAN_P (channel))
4306 /* carryover = 0; */ /* Does carryover make sense for datagrams? */
4307 readmax += 1024;
4309 #endif
4311 chars = (char *) alloca (carryover + readmax);
4312 if (carryover)
4313 /* See the comment above. */
4314 bcopy (SDATA (p->decoding_buf), chars, carryover);
4316 #ifdef DATAGRAM_SOCKETS
4317 /* We have a working select, so proc_buffered_char is always -1. */
4318 if (DATAGRAM_CHAN_P (channel))
4320 int len = datagram_address[channel].len;
4321 nbytes = recvfrom (channel, chars + carryover, readmax - carryover,
4322 0, datagram_address[channel].sa, &len);
4324 else
4325 #endif
4326 if (proc_buffered_char[channel] < 0)
4327 nbytes = emacs_read (channel, chars + carryover, readmax - carryover);
4328 else
4330 chars[carryover] = proc_buffered_char[channel];
4331 proc_buffered_char[channel] = -1;
4332 nbytes = emacs_read (channel, chars + carryover + 1, readmax - 1 - carryover);
4333 if (nbytes < 0)
4334 nbytes = 1;
4335 else
4336 nbytes = nbytes + 1;
4338 #endif /* not VMS */
4340 XSETINT (p->decoding_carryover, 0);
4342 /* At this point, NBYTES holds number of bytes just received
4343 (including the one in proc_buffered_char[channel]). */
4344 if (nbytes <= 0)
4346 if (nbytes < 0 || coding->mode & CODING_MODE_LAST_BLOCK)
4347 return nbytes;
4348 coding->mode |= CODING_MODE_LAST_BLOCK;
4351 /* Now set NBYTES how many bytes we must decode. */
4352 nbytes += carryover;
4354 /* Read and dispose of the process output. */
4355 outstream = p->filter;
4356 if (!NILP (outstream))
4358 /* We inhibit quit here instead of just catching it so that
4359 hitting ^G when a filter happens to be running won't screw
4360 it up. */
4361 int count = SPECPDL_INDEX ();
4362 Lisp_Object odeactivate;
4363 Lisp_Object obuffer, okeymap;
4364 Lisp_Object text;
4365 int outer_running_asynch_code = running_asynch_code;
4366 int waiting = waiting_for_user_input_p;
4368 /* No need to gcpro these, because all we do with them later
4369 is test them for EQness, and none of them should be a string. */
4370 odeactivate = Vdeactivate_mark;
4371 XSETBUFFER (obuffer, current_buffer);
4372 okeymap = current_buffer->keymap;
4374 specbind (Qinhibit_quit, Qt);
4375 specbind (Qlast_nonmenu_event, Qt);
4377 /* In case we get recursively called,
4378 and we already saved the match data nonrecursively,
4379 save the same match data in safely recursive fashion. */
4380 if (outer_running_asynch_code)
4382 Lisp_Object tem;
4383 /* Don't clobber the CURRENT match data, either! */
4384 tem = Fmatch_data (Qnil, Qnil);
4385 restore_match_data ();
4386 record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
4387 Fset_match_data (tem);
4390 /* For speed, if a search happens within this code,
4391 save the match data in a special nonrecursive fashion. */
4392 running_asynch_code = 1;
4394 text = decode_coding_string (make_unibyte_string (chars, nbytes),
4395 coding, 0);
4396 if (NILP (buffer_defaults.enable_multibyte_characters))
4397 /* We had better return unibyte string. */
4398 text = string_make_unibyte (text);
4400 Vlast_coding_system_used = coding->symbol;
4401 /* A new coding system might be found. */
4402 if (!EQ (p->decode_coding_system, coding->symbol))
4404 p->decode_coding_system = coding->symbol;
4406 /* Don't call setup_coding_system for
4407 proc_decode_coding_system[channel] here. It is done in
4408 detect_coding called via decode_coding above. */
4410 /* If a coding system for encoding is not yet decided, we set
4411 it as the same as coding-system for decoding.
4413 But, before doing that we must check if
4414 proc_encode_coding_system[p->outfd] surely points to a
4415 valid memory because p->outfd will be changed once EOF is
4416 sent to the process. */
4417 if (NILP (p->encode_coding_system)
4418 && proc_encode_coding_system[XINT (p->outfd)])
4420 p->encode_coding_system = coding->symbol;
4421 setup_coding_system (coding->symbol,
4422 proc_encode_coding_system[XINT (p->outfd)]);
4426 carryover = nbytes - coding->consumed;
4427 bcopy (chars + coding->consumed, SDATA (p->decoding_buf),
4428 carryover);
4429 XSETINT (p->decoding_carryover, carryover);
4430 nbytes = SBYTES (text);
4431 nchars = SCHARS (text);
4432 if (nbytes > 0)
4433 internal_condition_case_1 (read_process_output_call,
4434 Fcons (outstream,
4435 Fcons (proc, Fcons (text, Qnil))),
4436 !NILP (Vdebug_on_error) ? Qnil : Qerror,
4437 read_process_output_error_handler);
4439 /* If we saved the match data nonrecursively, restore it now. */
4440 restore_match_data ();
4441 running_asynch_code = outer_running_asynch_code;
4443 /* Handling the process output should not deactivate the mark. */
4444 Vdeactivate_mark = odeactivate;
4446 /* Restore waiting_for_user_input_p as it was
4447 when we were called, in case the filter clobbered it. */
4448 waiting_for_user_input_p = waiting;
4450 #if 0 /* Call record_asynch_buffer_change unconditionally,
4451 because we might have changed minor modes or other things
4452 that affect key bindings. */
4453 if (! EQ (Fcurrent_buffer (), obuffer)
4454 || ! EQ (current_buffer->keymap, okeymap))
4455 #endif
4456 /* But do it only if the caller is actually going to read events.
4457 Otherwise there's no need to make him wake up, and it could
4458 cause trouble (for example it would make Fsit_for return). */
4459 if (waiting_for_user_input_p == -1)
4460 record_asynch_buffer_change ();
4462 #ifdef VMS
4463 start_vms_process_read (vs);
4464 #endif
4465 unbind_to (count, Qnil);
4466 return nchars;
4469 /* If no filter, write into buffer if it isn't dead. */
4470 if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name))
4472 Lisp_Object old_read_only;
4473 int old_begv, old_zv;
4474 int old_begv_byte, old_zv_byte;
4475 Lisp_Object odeactivate;
4476 int before, before_byte;
4477 int opoint_byte;
4478 Lisp_Object text;
4479 struct buffer *b;
4481 odeactivate = Vdeactivate_mark;
4483 Fset_buffer (p->buffer);
4484 opoint = PT;
4485 opoint_byte = PT_BYTE;
4486 old_read_only = current_buffer->read_only;
4487 old_begv = BEGV;
4488 old_zv = ZV;
4489 old_begv_byte = BEGV_BYTE;
4490 old_zv_byte = ZV_BYTE;
4492 current_buffer->read_only = Qnil;
4494 /* Insert new output into buffer
4495 at the current end-of-output marker,
4496 thus preserving logical ordering of input and output. */
4497 if (XMARKER (p->mark)->buffer)
4498 SET_PT_BOTH (clip_to_bounds (BEGV, marker_position (p->mark), ZV),
4499 clip_to_bounds (BEGV_BYTE, marker_byte_position (p->mark),
4500 ZV_BYTE));
4501 else
4502 SET_PT_BOTH (ZV, ZV_BYTE);
4503 before = PT;
4504 before_byte = PT_BYTE;
4506 /* If the output marker is outside of the visible region, save
4507 the restriction and widen. */
4508 if (! (BEGV <= PT && PT <= ZV))
4509 Fwiden ();
4511 text = decode_coding_string (make_unibyte_string (chars, nbytes),
4512 coding, 0);
4513 Vlast_coding_system_used = coding->symbol;
4514 /* A new coding system might be found. See the comment in the
4515 similar code in the previous `if' block. */
4516 if (!EQ (p->decode_coding_system, coding->symbol))
4518 p->decode_coding_system = coding->symbol;
4519 if (NILP (p->encode_coding_system)
4520 && proc_encode_coding_system[XINT (p->outfd)])
4522 p->encode_coding_system = coding->symbol;
4523 setup_coding_system (coding->symbol,
4524 proc_encode_coding_system[XINT (p->outfd)]);
4527 carryover = nbytes - coding->consumed;
4528 bcopy (chars + coding->consumed, SDATA (p->decoding_buf),
4529 carryover);
4530 XSETINT (p->decoding_carryover, carryover);
4531 /* Adjust the multibyteness of TEXT to that of the buffer. */
4532 if (NILP (current_buffer->enable_multibyte_characters)
4533 != ! STRING_MULTIBYTE (text))
4534 text = (STRING_MULTIBYTE (text)
4535 ? Fstring_as_unibyte (text)
4536 : Fstring_as_multibyte (text));
4537 nbytes = SBYTES (text);
4538 nchars = SCHARS (text);
4539 /* Insert before markers in case we are inserting where
4540 the buffer's mark is, and the user's next command is Meta-y. */
4541 insert_from_string_before_markers (text, 0, 0, nchars, nbytes, 0);
4543 /* Make sure the process marker's position is valid when the
4544 process buffer is changed in the signal_after_change above.
4545 W3 is known to do that. */
4546 if (BUFFERP (p->buffer)
4547 && (b = XBUFFER (p->buffer), b != current_buffer))
4548 set_marker_both (p->mark, p->buffer, BUF_PT (b), BUF_PT_BYTE (b));
4549 else
4550 set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
4552 update_mode_lines++;
4554 /* Make sure opoint and the old restrictions
4555 float ahead of any new text just as point would. */
4556 if (opoint >= before)
4558 opoint += PT - before;
4559 opoint_byte += PT_BYTE - before_byte;
4561 if (old_begv > before)
4563 old_begv += PT - before;
4564 old_begv_byte += PT_BYTE - before_byte;
4566 if (old_zv >= before)
4568 old_zv += PT - before;
4569 old_zv_byte += PT_BYTE - before_byte;
4572 /* If the restriction isn't what it should be, set it. */
4573 if (old_begv != BEGV || old_zv != ZV)
4574 Fnarrow_to_region (make_number (old_begv), make_number (old_zv));
4576 /* Handling the process output should not deactivate the mark. */
4577 Vdeactivate_mark = odeactivate;
4579 current_buffer->read_only = old_read_only;
4580 SET_PT_BOTH (opoint, opoint_byte);
4581 set_buffer_internal (old);
4583 #ifdef VMS
4584 start_vms_process_read (vs);
4585 #endif
4586 return nbytes;
4589 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p,
4590 0, 0, 0,
4591 doc: /* Returns non-nil if emacs is waiting for input from the user.
4592 This is intended for use by asynchronous process output filters and sentinels. */)
4595 return (waiting_for_user_input_p ? Qt : Qnil);
4598 /* Sending data to subprocess */
4600 jmp_buf send_process_frame;
4601 Lisp_Object process_sent_to;
4603 SIGTYPE
4604 send_process_trap ()
4606 #ifdef BSD4_1
4607 sigrelse (SIGPIPE);
4608 sigrelse (SIGALRM);
4609 #endif /* BSD4_1 */
4610 longjmp (send_process_frame, 1);
4613 /* Send some data to process PROC.
4614 BUF is the beginning of the data; LEN is the number of characters.
4615 OBJECT is the Lisp object that the data comes from. If OBJECT is
4616 nil or t, it means that the data comes from C string.
4618 If OBJECT is not nil, the data is encoded by PROC's coding-system
4619 for encoding before it is sent.
4621 This function can evaluate Lisp code and can garbage collect. */
4623 void
4624 send_process (proc, buf, len, object)
4625 volatile Lisp_Object proc;
4626 unsigned char *volatile buf;
4627 volatile int len;
4628 volatile Lisp_Object object;
4630 /* Use volatile to protect variables from being clobbered by longjmp. */
4631 int rv;
4632 struct coding_system *coding;
4633 struct gcpro gcpro1;
4635 GCPRO1 (object);
4637 #ifdef VMS
4638 struct Lisp_Process *p = XPROCESS (proc);
4639 VMS_PROC_STUFF *vs, *get_vms_process_pointer();
4640 #endif /* VMS */
4642 if (! NILP (XPROCESS (proc)->raw_status_low))
4643 update_status (XPROCESS (proc));
4644 if (! EQ (XPROCESS (proc)->status, Qrun))
4645 error ("Process %s not running",
4646 SDATA (XPROCESS (proc)->name));
4647 if (XINT (XPROCESS (proc)->outfd) < 0)
4648 error ("Output file descriptor of %s is closed",
4649 SDATA (XPROCESS (proc)->name));
4651 coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];
4652 Vlast_coding_system_used = coding->symbol;
4654 if ((STRINGP (object) && STRING_MULTIBYTE (object))
4655 || (BUFFERP (object)
4656 && !NILP (XBUFFER (object)->enable_multibyte_characters))
4657 || EQ (object, Qt))
4659 if (!EQ (coding->symbol, XPROCESS (proc)->encode_coding_system))
4660 /* The coding system for encoding was changed to raw-text
4661 because we sent a unibyte text previously. Now we are
4662 sending a multibyte text, thus we must encode it by the
4663 original coding system specified for the current
4664 process. */
4665 setup_coding_system (XPROCESS (proc)->encode_coding_system, coding);
4666 /* src_multibyte should be set to 1 _after_ a call to
4667 setup_coding_system, since it resets src_multibyte to
4668 zero. */
4669 coding->src_multibyte = 1;
4671 else
4673 /* For sending a unibyte text, character code conversion should
4674 not take place but EOL conversion should. So, setup raw-text
4675 or one of the subsidiary if we have not yet done it. */
4676 if (coding->type != coding_type_raw_text)
4678 if (CODING_REQUIRE_FLUSHING (coding))
4680 /* But, before changing the coding, we must flush out data. */
4681 coding->mode |= CODING_MODE_LAST_BLOCK;
4682 send_process (proc, "", 0, Qt);
4684 coding->src_multibyte = 0;
4685 setup_raw_text_coding_system (coding);
4688 coding->dst_multibyte = 0;
4690 if (CODING_REQUIRE_ENCODING (coding))
4692 int require = encoding_buffer_size (coding, len);
4693 int from_byte = -1, from = -1, to = -1;
4694 unsigned char *temp_buf = NULL;
4696 if (BUFFERP (object))
4698 from_byte = BUF_PTR_BYTE_POS (XBUFFER (object), buf);
4699 from = buf_bytepos_to_charpos (XBUFFER (object), from_byte);
4700 to = buf_bytepos_to_charpos (XBUFFER (object), from_byte + len);
4702 else if (STRINGP (object))
4704 from_byte = buf - SDATA (object);
4705 from = string_byte_to_char (object, from_byte);
4706 to = string_byte_to_char (object, from_byte + len);
4709 if (coding->composing != COMPOSITION_DISABLED)
4711 if (from_byte >= 0)
4712 coding_save_composition (coding, from, to, object);
4713 else
4714 coding->composing = COMPOSITION_DISABLED;
4717 if (SBYTES (XPROCESS (proc)->encoding_buf) < require)
4718 XPROCESS (proc)->encoding_buf = make_uninit_string (require);
4720 if (from_byte >= 0)
4721 buf = (BUFFERP (object)
4722 ? BUF_BYTE_ADDRESS (XBUFFER (object), from_byte)
4723 : SDATA (object) + from_byte);
4725 object = XPROCESS (proc)->encoding_buf;
4726 encode_coding (coding, (char *) buf, SDATA (object),
4727 len, SBYTES (object));
4728 len = coding->produced;
4729 buf = SDATA (object);
4730 if (temp_buf)
4731 xfree (temp_buf);
4734 #ifdef VMS
4735 vs = get_vms_process_pointer (p->pid);
4736 if (vs == 0)
4737 error ("Could not find this process: %x", p->pid);
4738 else if (write_to_vms_process (vs, buf, len))
4740 #else /* not VMS */
4742 if (pty_max_bytes == 0)
4744 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
4745 pty_max_bytes = fpathconf (XFASTINT (XPROCESS (proc)->outfd),
4746 _PC_MAX_CANON);
4747 if (pty_max_bytes < 0)
4748 pty_max_bytes = 250;
4749 #else
4750 pty_max_bytes = 250;
4751 #endif
4752 /* Deduct one, to leave space for the eof. */
4753 pty_max_bytes--;
4756 /* 2000-09-21: Emacs 20.7, sparc-sun-solaris-2.6, GCC 2.95.2,
4757 CFLAGS="-g -O": The value of the parameter `proc' is clobbered
4758 when returning with longjmp despite being declared volatile. */
4759 if (!setjmp (send_process_frame))
4761 process_sent_to = proc;
4762 while (len > 0)
4764 int this = len;
4765 SIGTYPE (*old_sigpipe)();
4767 /* Decide how much data we can send in one batch.
4768 Long lines need to be split into multiple batches. */
4769 if (!NILP (XPROCESS (proc)->pty_flag))
4771 /* Starting this at zero is always correct when not the first
4772 iteration because the previous iteration ended by sending C-d.
4773 It may not be correct for the first iteration
4774 if a partial line was sent in a separate send_process call.
4775 If that proves worth handling, we need to save linepos
4776 in the process object. */
4777 int linepos = 0;
4778 unsigned char *ptr = (unsigned char *) buf;
4779 unsigned char *end = (unsigned char *) buf + len;
4781 /* Scan through this text for a line that is too long. */
4782 while (ptr != end && linepos < pty_max_bytes)
4784 if (*ptr == '\n')
4785 linepos = 0;
4786 else
4787 linepos++;
4788 ptr++;
4790 /* If we found one, break the line there
4791 and put in a C-d to force the buffer through. */
4792 this = ptr - buf;
4795 /* Send this batch, using one or more write calls. */
4796 while (this > 0)
4798 int outfd = XINT (XPROCESS (proc)->outfd);
4799 old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap);
4800 #ifdef DATAGRAM_SOCKETS
4801 if (DATAGRAM_CHAN_P (outfd))
4803 rv = sendto (outfd, (char *) buf, this,
4804 0, datagram_address[outfd].sa,
4805 datagram_address[outfd].len);
4806 if (rv < 0 && errno == EMSGSIZE)
4807 report_file_error ("sending datagram", Fcons (proc, Qnil));
4809 else
4810 #endif
4811 rv = emacs_write (outfd, (char *) buf, this);
4812 signal (SIGPIPE, old_sigpipe);
4814 if (rv < 0)
4816 if (0
4817 #ifdef EWOULDBLOCK
4818 || errno == EWOULDBLOCK
4819 #endif
4820 #ifdef EAGAIN
4821 || errno == EAGAIN
4822 #endif
4824 /* Buffer is full. Wait, accepting input;
4825 that may allow the program
4826 to finish doing output and read more. */
4828 Lisp_Object zero;
4829 int offset = 0;
4831 #ifdef BROKEN_PTY_READ_AFTER_EAGAIN
4832 /* A gross hack to work around a bug in FreeBSD.
4833 In the following sequence, read(2) returns
4834 bogus data:
4836 write(2) 1022 bytes
4837 write(2) 954 bytes, get EAGAIN
4838 read(2) 1024 bytes in process_read_output
4839 read(2) 11 bytes in process_read_output
4841 That is, read(2) returns more bytes than have
4842 ever been written successfully. The 1033 bytes
4843 read are the 1022 bytes written successfully
4844 after processing (for example with CRs added if
4845 the terminal is set up that way which it is
4846 here). The same bytes will be seen again in a
4847 later read(2), without the CRs. */
4849 if (errno == EAGAIN)
4851 int flags = FWRITE;
4852 ioctl (XINT (XPROCESS (proc)->outfd), TIOCFLUSH,
4853 &flags);
4855 #endif /* BROKEN_PTY_READ_AFTER_EAGAIN */
4857 /* Running filters might relocate buffers or strings.
4858 Arrange to relocate BUF. */
4859 if (BUFFERP (object))
4860 offset = BUF_PTR_BYTE_POS (XBUFFER (object), buf);
4861 else if (STRINGP (object))
4862 offset = buf - SDATA (object);
4864 XSETFASTINT (zero, 0);
4865 #ifdef EMACS_HAS_USECS
4866 wait_reading_process_input (0, 20000, zero, 0);
4867 #else
4868 wait_reading_process_input (1, 0, zero, 0);
4869 #endif
4871 if (BUFFERP (object))
4872 buf = BUF_BYTE_ADDRESS (XBUFFER (object), offset);
4873 else if (STRINGP (object))
4874 buf = offset + SDATA (object);
4876 rv = 0;
4878 else
4879 /* This is a real error. */
4880 report_file_error ("writing to process", Fcons (proc, Qnil));
4882 buf += rv;
4883 len -= rv;
4884 this -= rv;
4887 /* If we sent just part of the string, put in an EOF
4888 to force it through, before we send the rest. */
4889 if (len > 0)
4890 Fprocess_send_eof (proc);
4893 #endif /* not VMS */
4894 else
4896 #ifndef VMS
4897 proc = process_sent_to;
4898 #endif
4899 XPROCESS (proc)->raw_status_low = Qnil;
4900 XPROCESS (proc)->raw_status_high = Qnil;
4901 XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil));
4902 XSETINT (XPROCESS (proc)->tick, ++process_tick);
4903 deactivate_process (proc);
4904 #ifdef VMS
4905 error ("Error writing to process %s; closed it",
4906 SDATA (XPROCESS (proc)->name));
4907 #else
4908 error ("SIGPIPE raised on process %s; closed it",
4909 SDATA (XPROCESS (proc)->name));
4910 #endif
4913 UNGCPRO;
4916 DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region,
4917 3, 3, 0,
4918 doc: /* Send current contents of region as input to PROCESS.
4919 PROCESS may be a process, a buffer, the name of a process or buffer, or
4920 nil, indicating the current buffer's process.
4921 Called from program, takes three arguments, PROCESS, START and END.
4922 If the region is more than 500 characters long,
4923 it is sent in several bunches. This may happen even for shorter regions.
4924 Output from processes can arrive in between bunches. */)
4925 (process, start, end)
4926 Lisp_Object process, start, end;
4928 Lisp_Object proc;
4929 int start1, end1;
4931 proc = get_process (process);
4932 validate_region (&start, &end);
4934 if (XINT (start) < GPT && XINT (end) > GPT)
4935 move_gap (XINT (start));
4937 start1 = CHAR_TO_BYTE (XINT (start));
4938 end1 = CHAR_TO_BYTE (XINT (end));
4939 send_process (proc, BYTE_POS_ADDR (start1), end1 - start1,
4940 Fcurrent_buffer ());
4942 return Qnil;
4945 DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string,
4946 2, 2, 0,
4947 doc: /* Send PROCESS the contents of STRING as input.
4948 PROCESS may be a process, a buffer, the name of a process or buffer, or
4949 nil, indicating the current buffer's process.
4950 If STRING is more than 500 characters long,
4951 it is sent in several bunches. This may happen even for shorter strings.
4952 Output from processes can arrive in between bunches. */)
4953 (process, string)
4954 Lisp_Object process, string;
4956 Lisp_Object proc;
4957 CHECK_STRING (string);
4958 proc = get_process (process);
4959 send_process (proc, SDATA (string),
4960 SBYTES (string), string);
4961 return Qnil;
4964 DEFUN ("process-running-child-p", Fprocess_running_child_p,
4965 Sprocess_running_child_p, 0, 1, 0,
4966 doc: /* Return t if PROCESS has given the terminal to a child.
4967 If the operating system does not make it possible to find out,
4968 return t unconditionally. */)
4969 (process)
4970 Lisp_Object process;
4972 /* Initialize in case ioctl doesn't exist or gives an error,
4973 in a way that will cause returning t. */
4974 int gid = 0;
4975 Lisp_Object proc;
4976 struct Lisp_Process *p;
4978 proc = get_process (process);
4979 p = XPROCESS (proc);
4981 if (!EQ (p->childp, Qt))
4982 error ("Process %s is not a subprocess",
4983 SDATA (p->name));
4984 if (XINT (p->infd) < 0)
4985 error ("Process %s is not active",
4986 SDATA (p->name));
4988 #ifdef TIOCGPGRP
4989 if (!NILP (p->subtty))
4990 ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid);
4991 else
4992 ioctl (XINT (p->infd), TIOCGPGRP, &gid);
4993 #endif /* defined (TIOCGPGRP ) */
4995 if (gid == XFASTINT (p->pid))
4996 return Qnil;
4997 return Qt;
5000 /* send a signal number SIGNO to PROCESS.
5001 If CURRENT_GROUP is t, that means send to the process group
5002 that currently owns the terminal being used to communicate with PROCESS.
5003 This is used for various commands in shell mode.
5004 If CURRENT_GROUP is lambda, that means send to the process group
5005 that currently owns the terminal, but only if it is NOT the shell itself.
5007 If NOMSG is zero, insert signal-announcements into process's buffers
5008 right away.
5010 If we can, we try to signal PROCESS by sending control characters
5011 down the pty. This allows us to signal inferiors who have changed
5012 their uid, for which killpg would return an EPERM error. */
5014 static void
5015 process_send_signal (process, signo, current_group, nomsg)
5016 Lisp_Object process;
5017 int signo;
5018 Lisp_Object current_group;
5019 int nomsg;
5021 Lisp_Object proc;
5022 register struct Lisp_Process *p;
5023 int gid;
5024 int no_pgrp = 0;
5026 proc = get_process (process);
5027 p = XPROCESS (proc);
5029 if (!EQ (p->childp, Qt))
5030 error ("Process %s is not a subprocess",
5031 SDATA (p->name));
5032 if (XINT (p->infd) < 0)
5033 error ("Process %s is not active",
5034 SDATA (p->name));
5036 if (NILP (p->pty_flag))
5037 current_group = Qnil;
5039 /* If we are using pgrps, get a pgrp number and make it negative. */
5040 if (NILP (current_group))
5041 /* Send the signal to the shell's process group. */
5042 gid = XFASTINT (p->pid);
5043 else
5045 #ifdef SIGNALS_VIA_CHARACTERS
5046 /* If possible, send signals to the entire pgrp
5047 by sending an input character to it. */
5049 /* TERMIOS is the latest and bestest, and seems most likely to
5050 work. If the system has it, use it. */
5051 #ifdef HAVE_TERMIOS
5052 struct termios t;
5054 switch (signo)
5056 case SIGINT:
5057 tcgetattr (XINT (p->infd), &t);
5058 send_process (proc, &t.c_cc[VINTR], 1, Qnil);
5059 return;
5061 case SIGQUIT:
5062 tcgetattr (XINT (p->infd), &t);
5063 send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
5064 return;
5066 case SIGTSTP:
5067 tcgetattr (XINT (p->infd), &t);
5068 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
5069 send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
5070 #else
5071 send_process (proc, &t.c_cc[VSUSP], 1, Qnil);
5072 #endif
5073 return;
5076 #else /* ! HAVE_TERMIOS */
5078 /* On Berkeley descendants, the following IOCTL's retrieve the
5079 current control characters. */
5080 #if defined (TIOCGLTC) && defined (TIOCGETC)
5082 struct tchars c;
5083 struct ltchars lc;
5085 switch (signo)
5087 case SIGINT:
5088 ioctl (XINT (p->infd), TIOCGETC, &c);
5089 send_process (proc, &c.t_intrc, 1, Qnil);
5090 return;
5091 case SIGQUIT:
5092 ioctl (XINT (p->infd), TIOCGETC, &c);
5093 send_process (proc, &c.t_quitc, 1, Qnil);
5094 return;
5095 #ifdef SIGTSTP
5096 case SIGTSTP:
5097 ioctl (XINT (p->infd), TIOCGLTC, &lc);
5098 send_process (proc, &lc.t_suspc, 1, Qnil);
5099 return;
5100 #endif /* ! defined (SIGTSTP) */
5103 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
5105 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
5106 characters. */
5107 #ifdef TCGETA
5108 struct termio t;
5109 switch (signo)
5111 case SIGINT:
5112 ioctl (XINT (p->infd), TCGETA, &t);
5113 send_process (proc, &t.c_cc[VINTR], 1, Qnil);
5114 return;
5115 case SIGQUIT:
5116 ioctl (XINT (p->infd), TCGETA, &t);
5117 send_process (proc, &t.c_cc[VQUIT], 1, Qnil);
5118 return;
5119 #ifdef SIGTSTP
5120 case SIGTSTP:
5121 ioctl (XINT (p->infd), TCGETA, &t);
5122 send_process (proc, &t.c_cc[VSWTCH], 1, Qnil);
5123 return;
5124 #endif /* ! defined (SIGTSTP) */
5126 #else /* ! defined (TCGETA) */
5127 Your configuration files are messed up.
5128 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
5129 you'd better be using one of the alternatives above! */
5130 #endif /* ! defined (TCGETA) */
5131 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
5132 #endif /* ! defined HAVE_TERMIOS */
5133 abort ();
5134 /* The code above always returns from the function. */
5135 #endif /* defined (SIGNALS_VIA_CHARACTERS) */
5137 #ifdef TIOCGPGRP
5138 /* Get the current pgrp using the tty itself, if we have that.
5139 Otherwise, use the pty to get the pgrp.
5140 On pfa systems, saka@pfu.fujitsu.co.JP writes:
5141 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
5142 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
5143 His patch indicates that if TIOCGPGRP returns an error, then
5144 we should just assume that p->pid is also the process group id. */
5146 int err;
5148 if (!NILP (p->subtty))
5149 err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid);
5150 else
5151 err = ioctl (XINT (p->infd), TIOCGPGRP, &gid);
5153 if (err == -1)
5154 /* If we can't get the information, assume
5155 the shell owns the tty. */
5156 gid = XFASTINT (p->pid);
5159 /* It is not clear whether anything really can set GID to -1.
5160 Perhaps on some system one of those ioctls can or could do so.
5161 Or perhaps this is vestigial. */
5162 if (gid == -1)
5163 no_pgrp = 1;
5164 #else /* ! defined (TIOCGPGRP ) */
5165 /* Can't select pgrps on this system, so we know that
5166 the child itself heads the pgrp. */
5167 gid = XFASTINT (p->pid);
5168 #endif /* ! defined (TIOCGPGRP ) */
5170 /* If current_group is lambda, and the shell owns the terminal,
5171 don't send any signal. */
5172 if (EQ (current_group, Qlambda) && gid == XFASTINT (p->pid))
5173 return;
5176 switch (signo)
5178 #ifdef SIGCONT
5179 case SIGCONT:
5180 p->raw_status_low = Qnil;
5181 p->raw_status_high = Qnil;
5182 p->status = Qrun;
5183 XSETINT (p->tick, ++process_tick);
5184 if (!nomsg)
5185 status_notify ();
5186 break;
5187 #endif /* ! defined (SIGCONT) */
5188 case SIGINT:
5189 #ifdef VMS
5190 send_process (proc, "\003", 1, Qnil); /* ^C */
5191 goto whoosh;
5192 #endif
5193 case SIGQUIT:
5194 #ifdef VMS
5195 send_process (proc, "\031", 1, Qnil); /* ^Y */
5196 goto whoosh;
5197 #endif
5198 case SIGKILL:
5199 #ifdef VMS
5200 sys$forcex (&(XFASTINT (p->pid)), 0, 1);
5201 whoosh:
5202 #endif
5203 flush_pending_output (XINT (p->infd));
5204 break;
5207 /* If we don't have process groups, send the signal to the immediate
5208 subprocess. That isn't really right, but it's better than any
5209 obvious alternative. */
5210 if (no_pgrp)
5212 kill (XFASTINT (p->pid), signo);
5213 return;
5216 /* gid may be a pid, or minus a pgrp's number */
5217 #ifdef TIOCSIGSEND
5218 if (!NILP (current_group))
5219 ioctl (XINT (p->infd), TIOCSIGSEND, signo);
5220 else
5222 gid = - XFASTINT (p->pid);
5223 kill (gid, signo);
5225 #else /* ! defined (TIOCSIGSEND) */
5226 EMACS_KILLPG (gid, signo);
5227 #endif /* ! defined (TIOCSIGSEND) */
5230 DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0,
5231 doc: /* Interrupt process PROCESS.
5232 PROCESS may be a process, a buffer, or the name of a process or buffer.
5233 nil or no arg means current buffer's process.
5234 Second arg CURRENT-GROUP non-nil means send signal to
5235 the current process-group of the process's controlling terminal
5236 rather than to the process's own process group.
5237 If the process is a shell, this means interrupt current subjob
5238 rather than the shell.
5240 If CURRENT-GROUP is `lambda', and if the shell owns the terminal,
5241 don't send the signal. */)
5242 (process, current_group)
5243 Lisp_Object process, current_group;
5245 process_send_signal (process, SIGINT, current_group, 0);
5246 return process;
5249 DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0,
5250 doc: /* Kill process PROCESS. May be process or name of one.
5251 See function `interrupt-process' for more details on usage. */)
5252 (process, current_group)
5253 Lisp_Object process, current_group;
5255 process_send_signal (process, SIGKILL, current_group, 0);
5256 return process;
5259 DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0,
5260 doc: /* Send QUIT signal to process PROCESS. May be process or name of one.
5261 See function `interrupt-process' for more details on usage. */)
5262 (process, current_group)
5263 Lisp_Object process, current_group;
5265 process_send_signal (process, SIGQUIT, current_group, 0);
5266 return process;
5269 DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0,
5270 doc: /* Stop process PROCESS. May be process or name of one.
5271 See function `interrupt-process' for more details on usage.
5272 If PROCESS is a network process, inhibit handling of incoming traffic. */)
5273 (process, current_group)
5274 Lisp_Object process, current_group;
5276 #ifdef HAVE_SOCKETS
5277 if (PROCESSP (process) && NETCONN_P (process))
5279 struct Lisp_Process *p;
5281 p = XPROCESS (process);
5282 if (NILP (p->command)
5283 && XINT (p->infd) >= 0)
5285 FD_CLR (XINT (p->infd), &input_wait_mask);
5286 FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
5288 p->command = Qt;
5289 return process;
5291 #endif
5292 #ifndef SIGTSTP
5293 error ("no SIGTSTP support");
5294 #else
5295 process_send_signal (process, SIGTSTP, current_group, 0);
5296 #endif
5297 return process;
5300 DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0,
5301 doc: /* Continue process PROCESS. May be process or name of one.
5302 See function `interrupt-process' for more details on usage.
5303 If PROCESS is a network process, resume handling of incoming traffic. */)
5304 (process, current_group)
5305 Lisp_Object process, current_group;
5307 #ifdef HAVE_SOCKETS
5308 if (PROCESSP (process) && NETCONN_P (process))
5310 struct Lisp_Process *p;
5312 p = XPROCESS (process);
5313 if (EQ (p->command, Qt)
5314 && XINT (p->infd) >= 0
5315 && (!EQ (p->filter, Qt) || EQ (p->status, Qlisten)))
5317 FD_SET (XINT (p->infd), &input_wait_mask);
5318 FD_SET (XINT (p->infd), &non_keyboard_wait_mask);
5320 p->command = Qnil;
5321 return process;
5323 #endif
5324 #ifdef SIGCONT
5325 process_send_signal (process, SIGCONT, current_group, 0);
5326 #else
5327 error ("no SIGCONT support");
5328 #endif
5329 return process;
5332 DEFUN ("signal-process", Fsignal_process, Ssignal_process,
5333 2, 2, "nProcess number: \nnSignal code: ",
5334 doc: /* Send the process with process id PID the signal with code SIGCODE.
5335 PID must be an integer. The process need not be a child of this Emacs.
5336 SIGCODE may be an integer, or a symbol whose name is a signal name. */)
5337 (pid, sigcode)
5338 Lisp_Object pid, sigcode;
5340 CHECK_NUMBER (pid);
5342 #define handle_signal(NAME, VALUE) \
5343 else if (!strcmp (name, NAME)) \
5344 XSETINT (sigcode, VALUE)
5346 if (INTEGERP (sigcode))
5348 else
5350 unsigned char *name;
5352 CHECK_SYMBOL (sigcode);
5353 name = SDATA (SYMBOL_NAME (sigcode));
5355 if (0)
5357 #ifdef SIGHUP
5358 handle_signal ("SIGHUP", SIGHUP);
5359 #endif
5360 #ifdef SIGINT
5361 handle_signal ("SIGINT", SIGINT);
5362 #endif
5363 #ifdef SIGQUIT
5364 handle_signal ("SIGQUIT", SIGQUIT);
5365 #endif
5366 #ifdef SIGILL
5367 handle_signal ("SIGILL", SIGILL);
5368 #endif
5369 #ifdef SIGABRT
5370 handle_signal ("SIGABRT", SIGABRT);
5371 #endif
5372 #ifdef SIGEMT
5373 handle_signal ("SIGEMT", SIGEMT);
5374 #endif
5375 #ifdef SIGKILL
5376 handle_signal ("SIGKILL", SIGKILL);
5377 #endif
5378 #ifdef SIGFPE
5379 handle_signal ("SIGFPE", SIGFPE);
5380 #endif
5381 #ifdef SIGBUS
5382 handle_signal ("SIGBUS", SIGBUS);
5383 #endif
5384 #ifdef SIGSEGV
5385 handle_signal ("SIGSEGV", SIGSEGV);
5386 #endif
5387 #ifdef SIGSYS
5388 handle_signal ("SIGSYS", SIGSYS);
5389 #endif
5390 #ifdef SIGPIPE
5391 handle_signal ("SIGPIPE", SIGPIPE);
5392 #endif
5393 #ifdef SIGALRM
5394 handle_signal ("SIGALRM", SIGALRM);
5395 #endif
5396 #ifdef SIGTERM
5397 handle_signal ("SIGTERM", SIGTERM);
5398 #endif
5399 #ifdef SIGURG
5400 handle_signal ("SIGURG", SIGURG);
5401 #endif
5402 #ifdef SIGSTOP
5403 handle_signal ("SIGSTOP", SIGSTOP);
5404 #endif
5405 #ifdef SIGTSTP
5406 handle_signal ("SIGTSTP", SIGTSTP);
5407 #endif
5408 #ifdef SIGCONT
5409 handle_signal ("SIGCONT", SIGCONT);
5410 #endif
5411 #ifdef SIGCHLD
5412 handle_signal ("SIGCHLD", SIGCHLD);
5413 #endif
5414 #ifdef SIGTTIN
5415 handle_signal ("SIGTTIN", SIGTTIN);
5416 #endif
5417 #ifdef SIGTTOU
5418 handle_signal ("SIGTTOU", SIGTTOU);
5419 #endif
5420 #ifdef SIGIO
5421 handle_signal ("SIGIO", SIGIO);
5422 #endif
5423 #ifdef SIGXCPU
5424 handle_signal ("SIGXCPU", SIGXCPU);
5425 #endif
5426 #ifdef SIGXFSZ
5427 handle_signal ("SIGXFSZ", SIGXFSZ);
5428 #endif
5429 #ifdef SIGVTALRM
5430 handle_signal ("SIGVTALRM", SIGVTALRM);
5431 #endif
5432 #ifdef SIGPROF
5433 handle_signal ("SIGPROF", SIGPROF);
5434 #endif
5435 #ifdef SIGWINCH
5436 handle_signal ("SIGWINCH", SIGWINCH);
5437 #endif
5438 #ifdef SIGINFO
5439 handle_signal ("SIGINFO", SIGINFO);
5440 #endif
5441 #ifdef SIGUSR1
5442 handle_signal ("SIGUSR1", SIGUSR1);
5443 #endif
5444 #ifdef SIGUSR2
5445 handle_signal ("SIGUSR2", SIGUSR2);
5446 #endif
5447 else
5448 error ("Undefined signal name %s", name);
5451 #undef handle_signal
5453 return make_number (kill (XINT (pid), XINT (sigcode)));
5456 DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0,
5457 doc: /* Make PROCESS see end-of-file in its input.
5458 EOF comes after any text already sent to it.
5459 PROCESS may be a process, a buffer, the name of a process or buffer, or
5460 nil, indicating the current buffer's process.
5461 If PROCESS is a network connection, or is a process communicating
5462 through a pipe (as opposed to a pty), then you cannot send any more
5463 text to PROCESS after you call this function. */)
5464 (process)
5465 Lisp_Object process;
5467 Lisp_Object proc;
5468 struct coding_system *coding;
5470 if (DATAGRAM_CONN_P (process))
5471 return process;
5473 proc = get_process (process);
5474 coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];
5476 /* Make sure the process is really alive. */
5477 if (! NILP (XPROCESS (proc)->raw_status_low))
5478 update_status (XPROCESS (proc));
5479 if (! EQ (XPROCESS (proc)->status, Qrun))
5480 error ("Process %s not running", SDATA (XPROCESS (proc)->name));
5482 if (CODING_REQUIRE_FLUSHING (coding))
5484 coding->mode |= CODING_MODE_LAST_BLOCK;
5485 send_process (proc, "", 0, Qnil);
5488 #ifdef VMS
5489 send_process (proc, "\032", 1, Qnil); /* ^z */
5490 #else
5491 if (!NILP (XPROCESS (proc)->pty_flag))
5492 send_process (proc, "\004", 1, Qnil);
5493 else
5495 int old_outfd, new_outfd;
5497 #ifdef HAVE_SHUTDOWN
5498 /* If this is a network connection, or socketpair is used
5499 for communication with the subprocess, call shutdown to cause EOF.
5500 (In some old system, shutdown to socketpair doesn't work.
5501 Then we just can't win.) */
5502 if (NILP (XPROCESS (proc)->pid)
5503 || XINT (XPROCESS (proc)->outfd) == XINT (XPROCESS (proc)->infd))
5504 shutdown (XINT (XPROCESS (proc)->outfd), 1);
5505 /* In case of socketpair, outfd == infd, so don't close it. */
5506 if (XINT (XPROCESS (proc)->outfd) != XINT (XPROCESS (proc)->infd))
5507 emacs_close (XINT (XPROCESS (proc)->outfd));
5508 #else /* not HAVE_SHUTDOWN */
5509 emacs_close (XINT (XPROCESS (proc)->outfd));
5510 #endif /* not HAVE_SHUTDOWN */
5511 new_outfd = emacs_open (NULL_DEVICE, O_WRONLY, 0);
5512 old_outfd = XINT (XPROCESS (proc)->outfd);
5514 if (!proc_encode_coding_system[new_outfd])
5515 proc_encode_coding_system[new_outfd]
5516 = (struct coding_system *) xmalloc (sizeof (struct coding_system));
5517 bcopy (proc_encode_coding_system[old_outfd],
5518 proc_encode_coding_system[new_outfd],
5519 sizeof (struct coding_system));
5520 bzero (proc_encode_coding_system[old_outfd],
5521 sizeof (struct coding_system));
5523 XSETINT (XPROCESS (proc)->outfd, new_outfd);
5525 #endif /* VMS */
5526 return process;
5529 /* Kill all processes associated with `buffer'.
5530 If `buffer' is nil, kill all processes */
5532 void
5533 kill_buffer_processes (buffer)
5534 Lisp_Object buffer;
5536 Lisp_Object tail, proc;
5538 for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
5540 proc = XCDR (XCAR (tail));
5541 if (GC_PROCESSP (proc)
5542 && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer)))
5544 if (NETCONN_P (proc))
5545 Fdelete_process (proc);
5546 else if (XINT (XPROCESS (proc)->infd) >= 0)
5547 process_send_signal (proc, SIGHUP, Qnil, 1);
5552 /* On receipt of a signal that a child status has changed, loop asking
5553 about children with changed statuses until the system says there
5554 are no more.
5556 All we do is change the status; we do not run sentinels or print
5557 notifications. That is saved for the next time keyboard input is
5558 done, in order to avoid timing errors.
5560 ** WARNING: this can be called during garbage collection.
5561 Therefore, it must not be fooled by the presence of mark bits in
5562 Lisp objects.
5564 ** USG WARNING: Although it is not obvious from the documentation
5565 in signal(2), on a USG system the SIGCLD handler MUST NOT call
5566 signal() before executing at least one wait(), otherwise the
5567 handler will be called again, resulting in an infinite loop. The
5568 relevant portion of the documentation reads "SIGCLD signals will be
5569 queued and the signal-catching function will be continually
5570 reentered until the queue is empty". Invoking signal() causes the
5571 kernel to reexamine the SIGCLD queue. Fred Fish, UniSoft Systems
5572 Inc. */
5574 SIGTYPE
5575 sigchld_handler (signo)
5576 int signo;
5578 int old_errno = errno;
5579 Lisp_Object proc;
5580 register struct Lisp_Process *p;
5581 extern EMACS_TIME *input_available_clear_time;
5583 #ifdef BSD4_1
5584 extern int sigheld;
5585 sigheld |= sigbit (SIGCHLD);
5586 #endif
5588 while (1)
5590 register int pid;
5591 WAITTYPE w;
5592 Lisp_Object tail;
5594 #ifdef WNOHANG
5595 #ifndef WUNTRACED
5596 #define WUNTRACED 0
5597 #endif /* no WUNTRACED */
5598 /* Keep trying to get a status until we get a definitive result. */
5601 errno = 0;
5602 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
5604 while (pid < 0 && errno == EINTR);
5606 if (pid <= 0)
5608 /* PID == 0 means no processes found, PID == -1 means a real
5609 failure. We have done all our job, so return. */
5611 /* USG systems forget handlers when they are used;
5612 must reestablish each time */
5613 #if defined (USG) && !defined (POSIX_SIGNALS)
5614 signal (signo, sigchld_handler); /* WARNING - must come after wait3() */
5615 #endif
5616 #ifdef BSD4_1
5617 sigheld &= ~sigbit (SIGCHLD);
5618 sigrelse (SIGCHLD);
5619 #endif
5620 errno = old_errno;
5621 return;
5623 #else
5624 pid = wait (&w);
5625 #endif /* no WNOHANG */
5627 /* Find the process that signaled us, and record its status. */
5629 p = 0;
5630 for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
5632 proc = XCDR (XCAR (tail));
5633 p = XPROCESS (proc);
5634 if (GC_EQ (p->childp, Qt) && XINT (p->pid) == pid)
5635 break;
5636 p = 0;
5639 /* Look for an asynchronous process whose pid hasn't been filled
5640 in yet. */
5641 if (p == 0)
5642 for (tail = Vprocess_alist; GC_CONSP (tail); tail = XCDR (tail))
5644 proc = XCDR (XCAR (tail));
5645 p = XPROCESS (proc);
5646 if (GC_INTEGERP (p->pid) && XINT (p->pid) == -1)
5647 break;
5648 p = 0;
5651 /* Change the status of the process that was found. */
5652 if (p != 0)
5654 union { int i; WAITTYPE wt; } u;
5655 int clear_desc_flag = 0;
5657 XSETINT (p->tick, ++process_tick);
5658 u.wt = w;
5659 XSETINT (p->raw_status_low, u.i & 0xffff);
5660 XSETINT (p->raw_status_high, u.i >> 16);
5662 /* If process has terminated, stop waiting for its output. */
5663 if ((WIFSIGNALED (w) || WIFEXITED (w))
5664 && XINT (p->infd) >= 0)
5665 clear_desc_flag = 1;
5667 /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */
5668 if (clear_desc_flag)
5670 FD_CLR (XINT (p->infd), &input_wait_mask);
5671 FD_CLR (XINT (p->infd), &non_keyboard_wait_mask);
5674 /* Tell wait_reading_process_input that it needs to wake up and
5675 look around. */
5676 if (input_available_clear_time)
5677 EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
5680 /* There was no asynchronous process found for that id. Check
5681 if we have a synchronous process. */
5682 else
5684 synch_process_alive = 0;
5686 /* Report the status of the synchronous process. */
5687 if (WIFEXITED (w))
5688 synch_process_retcode = WRETCODE (w);
5689 else if (WIFSIGNALED (w))
5691 int code = WTERMSIG (w);
5692 char *signame;
5694 synchronize_system_messages_locale ();
5695 signame = strsignal (code);
5697 if (signame == 0)
5698 signame = "unknown";
5700 synch_process_death = signame;
5703 /* Tell wait_reading_process_input that it needs to wake up and
5704 look around. */
5705 if (input_available_clear_time)
5706 EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
5709 /* On some systems, we must return right away.
5710 If any more processes want to signal us, we will
5711 get another signal.
5712 Otherwise (on systems that have WNOHANG), loop around
5713 to use up all the processes that have something to tell us. */
5714 #if (defined WINDOWSNT \
5715 || (defined USG && !defined GNU_LINUX \
5716 && !(defined HPUX && defined WNOHANG)))
5717 #if defined (USG) && ! defined (POSIX_SIGNALS)
5718 signal (signo, sigchld_handler);
5719 #endif
5720 errno = old_errno;
5721 return;
5722 #endif /* USG, but not HPUX with WNOHANG */
5727 static Lisp_Object
5728 exec_sentinel_unwind (data)
5729 Lisp_Object data;
5731 XPROCESS (XCAR (data))->sentinel = XCDR (data);
5732 return Qnil;
5735 static Lisp_Object
5736 exec_sentinel_error_handler (error)
5737 Lisp_Object error;
5739 cmd_error_internal (error, "error in process sentinel: ");
5740 Vinhibit_quit = Qt;
5741 update_echo_area ();
5742 Fsleep_for (make_number (2), Qnil);
5743 return Qt;
5746 static void
5747 exec_sentinel (proc, reason)
5748 Lisp_Object proc, reason;
5750 Lisp_Object sentinel, obuffer, odeactivate, okeymap;
5751 register struct Lisp_Process *p = XPROCESS (proc);
5752 int count = SPECPDL_INDEX ();
5753 int outer_running_asynch_code = running_asynch_code;
5754 int waiting = waiting_for_user_input_p;
5756 /* No need to gcpro these, because all we do with them later
5757 is test them for EQness, and none of them should be a string. */
5758 odeactivate = Vdeactivate_mark;
5759 XSETBUFFER (obuffer, current_buffer);
5760 okeymap = current_buffer->keymap;
5762 sentinel = p->sentinel;
5763 if (NILP (sentinel))
5764 return;
5766 /* Zilch the sentinel while it's running, to avoid recursive invocations;
5767 assure that it gets restored no matter how the sentinel exits. */
5768 p->sentinel = Qnil;
5769 record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel));
5770 /* Inhibit quit so that random quits don't screw up a running filter. */
5771 specbind (Qinhibit_quit, Qt);
5772 specbind (Qlast_nonmenu_event, Qt);
5774 /* In case we get recursively called,
5775 and we already saved the match data nonrecursively,
5776 save the same match data in safely recursive fashion. */
5777 if (outer_running_asynch_code)
5779 Lisp_Object tem;
5780 tem = Fmatch_data (Qnil, Qnil);
5781 restore_match_data ();
5782 record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
5783 Fset_match_data (tem);
5786 /* For speed, if a search happens within this code,
5787 save the match data in a special nonrecursive fashion. */
5788 running_asynch_code = 1;
5790 internal_condition_case_1 (read_process_output_call,
5791 Fcons (sentinel,
5792 Fcons (proc, Fcons (reason, Qnil))),
5793 !NILP (Vdebug_on_error) ? Qnil : Qerror,
5794 exec_sentinel_error_handler);
5796 /* If we saved the match data nonrecursively, restore it now. */
5797 restore_match_data ();
5798 running_asynch_code = outer_running_asynch_code;
5800 Vdeactivate_mark = odeactivate;
5802 /* Restore waiting_for_user_input_p as it was
5803 when we were called, in case the filter clobbered it. */
5804 waiting_for_user_input_p = waiting;
5806 #if 0
5807 if (! EQ (Fcurrent_buffer (), obuffer)
5808 || ! EQ (current_buffer->keymap, okeymap))
5809 #endif
5810 /* But do it only if the caller is actually going to read events.
5811 Otherwise there's no need to make him wake up, and it could
5812 cause trouble (for example it would make Fsit_for return). */
5813 if (waiting_for_user_input_p == -1)
5814 record_asynch_buffer_change ();
5816 unbind_to (count, Qnil);
5819 /* Report all recent events of a change in process status
5820 (either run the sentinel or output a message).
5821 This is usually done while Emacs is waiting for keyboard input
5822 but can be done at other times. */
5824 void
5825 status_notify ()
5827 register Lisp_Object proc, buffer;
5828 Lisp_Object tail, msg;
5829 struct gcpro gcpro1, gcpro2;
5831 tail = Qnil;
5832 msg = Qnil;
5833 /* We need to gcpro tail; if read_process_output calls a filter
5834 which deletes a process and removes the cons to which tail points
5835 from Vprocess_alist, and then causes a GC, tail is an unprotected
5836 reference. */
5837 GCPRO2 (tail, msg);
5839 /* Set this now, so that if new processes are created by sentinels
5840 that we run, we get called again to handle their status changes. */
5841 update_tick = process_tick;
5843 for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail))
5845 Lisp_Object symbol;
5846 register struct Lisp_Process *p;
5848 proc = Fcdr (Fcar (tail));
5849 p = XPROCESS (proc);
5851 if (XINT (p->tick) != XINT (p->update_tick))
5853 XSETINT (p->update_tick, XINT (p->tick));
5855 /* If process is still active, read any output that remains. */
5856 while (! EQ (p->filter, Qt)
5857 && ! EQ (p->status, Qconnect)
5858 && ! EQ (p->status, Qlisten)
5859 && ! EQ (p->command, Qt) /* Network process not stopped. */
5860 && XINT (p->infd) >= 0
5861 && read_process_output (proc, XINT (p->infd)) > 0);
5863 buffer = p->buffer;
5865 /* Get the text to use for the message. */
5866 if (!NILP (p->raw_status_low))
5867 update_status (p);
5868 msg = status_message (p->status);
5870 /* If process is terminated, deactivate it or delete it. */
5871 symbol = p->status;
5872 if (CONSP (p->status))
5873 symbol = XCAR (p->status);
5875 if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)
5876 || EQ (symbol, Qclosed))
5878 if (delete_exited_processes)
5879 remove_process (proc);
5880 else
5881 deactivate_process (proc);
5884 /* The actions above may have further incremented p->tick.
5885 So set p->update_tick again
5886 so that an error in the sentinel will not cause
5887 this code to be run again. */
5888 XSETINT (p->update_tick, XINT (p->tick));
5889 /* Now output the message suitably. */
5890 if (!NILP (p->sentinel))
5891 exec_sentinel (proc, msg);
5892 /* Don't bother with a message in the buffer
5893 when a process becomes runnable. */
5894 else if (!EQ (symbol, Qrun) && !NILP (buffer))
5896 Lisp_Object ro, tem;
5897 struct buffer *old = current_buffer;
5898 int opoint, opoint_byte;
5899 int before, before_byte;
5901 ro = XBUFFER (buffer)->read_only;
5903 /* Avoid error if buffer is deleted
5904 (probably that's why the process is dead, too) */
5905 if (NILP (XBUFFER (buffer)->name))
5906 continue;
5907 Fset_buffer (buffer);
5909 opoint = PT;
5910 opoint_byte = PT_BYTE;
5911 /* Insert new output into buffer
5912 at the current end-of-output marker,
5913 thus preserving logical ordering of input and output. */
5914 if (XMARKER (p->mark)->buffer)
5915 Fgoto_char (p->mark);
5916 else
5917 SET_PT_BOTH (ZV, ZV_BYTE);
5919 before = PT;
5920 before_byte = PT_BYTE;
5922 tem = current_buffer->read_only;
5923 current_buffer->read_only = Qnil;
5924 insert_string ("\nProcess ");
5925 Finsert (1, &p->name);
5926 insert_string (" ");
5927 Finsert (1, &msg);
5928 current_buffer->read_only = tem;
5929 set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
5931 if (opoint >= before)
5932 SET_PT_BOTH (opoint + (PT - before),
5933 opoint_byte + (PT_BYTE - before_byte));
5934 else
5935 SET_PT_BOTH (opoint, opoint_byte);
5937 set_buffer_internal (old);
5940 } /* end for */
5942 update_mode_lines++; /* in case buffers use %s in mode-line-format */
5943 redisplay_preserve_echo_area (13);
5945 UNGCPRO;
5949 DEFUN ("set-process-coding-system", Fset_process_coding_system,
5950 Sset_process_coding_system, 1, 3, 0,
5951 doc: /* Set coding systems of PROCESS to DECODING and ENCODING.
5952 DECODING will be used to decode subprocess output and ENCODING to
5953 encode subprocess input. */)
5954 (proc, decoding, encoding)
5955 register Lisp_Object proc, decoding, encoding;
5957 register struct Lisp_Process *p;
5959 CHECK_PROCESS (proc);
5960 p = XPROCESS (proc);
5961 if (XINT (p->infd) < 0)
5962 error ("Input file descriptor of %s closed", SDATA (p->name));
5963 if (XINT (p->outfd) < 0)
5964 error ("Output file descriptor of %s closed", SDATA (p->name));
5966 p->decode_coding_system = Fcheck_coding_system (decoding);
5967 p->encode_coding_system = Fcheck_coding_system (encoding);
5968 setup_coding_system (decoding,
5969 proc_decode_coding_system[XINT (p->infd)]);
5970 setup_coding_system (encoding,
5971 proc_encode_coding_system[XINT (p->outfd)]);
5973 return Qnil;
5976 DEFUN ("process-coding-system",
5977 Fprocess_coding_system, Sprocess_coding_system, 1, 1, 0,
5978 doc: /* Return a cons of coding systems for decoding and encoding of PROCESS. */)
5979 (proc)
5980 register Lisp_Object proc;
5982 CHECK_PROCESS (proc);
5983 return Fcons (XPROCESS (proc)->decode_coding_system,
5984 XPROCESS (proc)->encode_coding_system);
5987 /* The first time this is called, assume keyboard input comes from DESC
5988 instead of from where we used to expect it.
5989 Subsequent calls mean assume input keyboard can come from DESC
5990 in addition to other places. */
5992 static int add_keyboard_wait_descriptor_called_flag;
5994 void
5995 add_keyboard_wait_descriptor (desc)
5996 int desc;
5998 if (! add_keyboard_wait_descriptor_called_flag)
5999 FD_CLR (0, &input_wait_mask);
6000 add_keyboard_wait_descriptor_called_flag = 1;
6001 FD_SET (desc, &input_wait_mask);
6002 FD_SET (desc, &non_process_wait_mask);
6003 if (desc > max_keyboard_desc)
6004 max_keyboard_desc = desc;
6007 /* From now on, do not expect DESC to give keyboard input. */
6009 void
6010 delete_keyboard_wait_descriptor (desc)
6011 int desc;
6013 int fd;
6014 int lim = max_keyboard_desc;
6016 FD_CLR (desc, &input_wait_mask);
6017 FD_CLR (desc, &non_process_wait_mask);
6019 if (desc == max_keyboard_desc)
6020 for (fd = 0; fd < lim; fd++)
6021 if (FD_ISSET (fd, &input_wait_mask)
6022 && !FD_ISSET (fd, &non_keyboard_wait_mask))
6023 max_keyboard_desc = fd;
6026 /* Return nonzero if *MASK has a bit set
6027 that corresponds to one of the keyboard input descriptors. */
6030 keyboard_bit_set (mask)
6031 SELECT_TYPE *mask;
6033 int fd;
6035 for (fd = 0; fd <= max_keyboard_desc; fd++)
6036 if (FD_ISSET (fd, mask) && FD_ISSET (fd, &input_wait_mask)
6037 && !FD_ISSET (fd, &non_keyboard_wait_mask))
6038 return 1;
6040 return 0;
6043 void
6044 init_process ()
6046 register int i;
6048 #ifdef SIGCHLD
6049 #ifndef CANNOT_DUMP
6050 if (! noninteractive || initialized)
6051 #endif
6052 signal (SIGCHLD, sigchld_handler);
6053 #endif
6055 FD_ZERO (&input_wait_mask);
6056 FD_ZERO (&non_keyboard_wait_mask);
6057 FD_ZERO (&non_process_wait_mask);
6058 max_process_desc = 0;
6060 FD_SET (0, &input_wait_mask);
6062 Vprocess_alist = Qnil;
6063 for (i = 0; i < MAXDESC; i++)
6065 chan_process[i] = Qnil;
6066 proc_buffered_char[i] = -1;
6068 bzero (proc_decode_coding_system, sizeof proc_decode_coding_system);
6069 bzero (proc_encode_coding_system, sizeof proc_encode_coding_system);
6070 #ifdef DATAGRAM_SOCKETS
6071 bzero (datagram_address, sizeof datagram_address);
6072 #endif
6074 #ifdef HAVE_SOCKETS
6076 Lisp_Object subfeatures = Qnil;
6077 #define ADD_SUBFEATURE(key, val) \
6078 subfeatures = Fcons (Fcons (key, Fcons (val, Qnil)), subfeatures)
6080 #ifdef NON_BLOCKING_CONNECT
6081 ADD_SUBFEATURE (QCnowait, Qt);
6082 #endif
6083 #ifdef DATAGRAM_SOCKETS
6084 ADD_SUBFEATURE (QCtype, Qdatagram);
6085 #endif
6086 #ifdef HAVE_LOCAL_SOCKETS
6087 ADD_SUBFEATURE (QCfamily, Qlocal);
6088 #endif
6089 #ifdef HAVE_GETSOCKNAME
6090 ADD_SUBFEATURE (QCservice, Qt);
6091 #endif
6092 #if !defined(TERM) && (defined(O_NONBLOCK) || defined(O_NDELAY))
6093 ADD_SUBFEATURE (QCserver, Qt);
6094 #endif
6095 #ifdef SO_BINDTODEVICE
6096 ADD_SUBFEATURE (QCoptions, intern ("bindtodevice"));
6097 #endif
6098 #ifdef SO_BROADCAST
6099 ADD_SUBFEATURE (QCoptions, intern ("broadcast"));
6100 #endif
6101 #ifdef SO_DONTROUTE
6102 ADD_SUBFEATURE (QCoptions, intern ("dontroute"));
6103 #endif
6104 #ifdef SO_KEEPALIVE
6105 ADD_SUBFEATURE (QCoptions, intern ("keepalive"));
6106 #endif
6107 #ifdef SO_LINGER
6108 ADD_SUBFEATURE (QCoptions, intern ("linger"));
6109 #endif
6110 #ifdef SO_OOBINLINE
6111 ADD_SUBFEATURE (QCoptions, intern ("oobinline"));
6112 #endif
6113 #ifdef SO_PRIORITY
6114 ADD_SUBFEATURE (QCoptions, intern ("priority"));
6115 #endif
6116 #ifdef SO_REUSEADDR
6117 ADD_SUBFEATURE (QCoptions, intern ("reuseaddr"));
6118 #endif
6119 Fprovide (intern ("make-network-process"), subfeatures);
6121 #endif /* HAVE_SOCKETS */
6124 void
6125 syms_of_process ()
6127 Qprocessp = intern ("processp");
6128 staticpro (&Qprocessp);
6129 Qrun = intern ("run");
6130 staticpro (&Qrun);
6131 Qstop = intern ("stop");
6132 staticpro (&Qstop);
6133 Qsignal = intern ("signal");
6134 staticpro (&Qsignal);
6136 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
6137 here again.
6139 Qexit = intern ("exit");
6140 staticpro (&Qexit); */
6142 Qopen = intern ("open");
6143 staticpro (&Qopen);
6144 Qclosed = intern ("closed");
6145 staticpro (&Qclosed);
6146 Qconnect = intern ("connect");
6147 staticpro (&Qconnect);
6148 Qfailed = intern ("failed");
6149 staticpro (&Qfailed);
6150 Qlisten = intern ("listen");
6151 staticpro (&Qlisten);
6152 Qlocal = intern ("local");
6153 staticpro (&Qlocal);
6154 Qdatagram = intern ("datagram");
6155 staticpro (&Qdatagram);
6157 QCname = intern (":name");
6158 staticpro (&QCname);
6159 QCbuffer = intern (":buffer");
6160 staticpro (&QCbuffer);
6161 QChost = intern (":host");
6162 staticpro (&QChost);
6163 QCservice = intern (":service");
6164 staticpro (&QCservice);
6165 QCtype = intern (":type");
6166 staticpro (&QCtype);
6167 QClocal = intern (":local");
6168 staticpro (&QClocal);
6169 QCremote = intern (":remote");
6170 staticpro (&QCremote);
6171 QCcoding = intern (":coding");
6172 staticpro (&QCcoding);
6173 QCserver = intern (":server");
6174 staticpro (&QCserver);
6175 QCnowait = intern (":nowait");
6176 staticpro (&QCnowait);
6177 QCsentinel = intern (":sentinel");
6178 staticpro (&QCsentinel);
6179 QClog = intern (":log");
6180 staticpro (&QClog);
6181 QCnoquery = intern (":noquery");
6182 staticpro (&QCnoquery);
6183 QCstop = intern (":stop");
6184 staticpro (&QCstop);
6185 QCoptions = intern (":options");
6186 staticpro (&QCoptions);
6188 Qlast_nonmenu_event = intern ("last-nonmenu-event");
6189 staticpro (&Qlast_nonmenu_event);
6191 staticpro (&Vprocess_alist);
6193 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes,
6194 doc: /* *Non-nil means delete processes immediately when they exit.
6195 nil means don't delete them until `list-processes' is run. */);
6197 delete_exited_processes = 1;
6199 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type,
6200 doc: /* Control type of device used to communicate with subprocesses.
6201 Values are nil to use a pipe, or t or `pty' to use a pty.
6202 The value has no effect if the system has no ptys or if all ptys are busy:
6203 then a pipe is used in any case.
6204 The value takes effect when `start-process' is called. */);
6205 Vprocess_connection_type = Qt;
6207 defsubr (&Sprocessp);
6208 defsubr (&Sget_process);
6209 defsubr (&Sget_buffer_process);
6210 defsubr (&Sdelete_process);
6211 defsubr (&Sprocess_status);
6212 defsubr (&Sprocess_exit_status);
6213 defsubr (&Sprocess_id);
6214 defsubr (&Sprocess_name);
6215 defsubr (&Sprocess_tty_name);
6216 defsubr (&Sprocess_command);
6217 defsubr (&Sset_process_buffer);
6218 defsubr (&Sprocess_buffer);
6219 defsubr (&Sprocess_mark);
6220 defsubr (&Sset_process_filter);
6221 defsubr (&Sprocess_filter);
6222 defsubr (&Sset_process_sentinel);
6223 defsubr (&Sprocess_sentinel);
6224 defsubr (&Sset_process_window_size);
6225 defsubr (&Sset_process_inherit_coding_system_flag);
6226 defsubr (&Sprocess_inherit_coding_system_flag);
6227 defsubr (&Sset_process_query_on_exit_flag);
6228 defsubr (&Sprocess_query_on_exit_flag);
6229 defsubr (&Sprocess_contact);
6230 defsubr (&Slist_processes);
6231 defsubr (&Sprocess_list);
6232 defsubr (&Sstart_process);
6233 #ifdef HAVE_SOCKETS
6234 defsubr (&Sset_network_process_options);
6235 defsubr (&Smake_network_process);
6236 #endif /* HAVE_SOCKETS */
6237 #ifdef DATAGRAM_SOCKETS
6238 defsubr (&Sprocess_datagram_address);
6239 defsubr (&Sset_process_datagram_address);
6240 #endif
6241 defsubr (&Saccept_process_output);
6242 defsubr (&Sprocess_send_region);
6243 defsubr (&Sprocess_send_string);
6244 defsubr (&Sinterrupt_process);
6245 defsubr (&Skill_process);
6246 defsubr (&Squit_process);
6247 defsubr (&Sstop_process);
6248 defsubr (&Scontinue_process);
6249 defsubr (&Sprocess_running_child_p);
6250 defsubr (&Sprocess_send_eof);
6251 defsubr (&Ssignal_process);
6252 defsubr (&Swaiting_for_user_input_p);
6253 /* defsubr (&Sprocess_connection); */
6254 defsubr (&Sset_process_coding_system);
6255 defsubr (&Sprocess_coding_system);
6259 #else /* not subprocesses */
6261 #include <sys/types.h>
6262 #include <errno.h>
6264 #include "lisp.h"
6265 #include "systime.h"
6266 #include "charset.h"
6267 #include "coding.h"
6268 #include "termopts.h"
6269 #include "sysselect.h"
6271 extern int frame_garbaged;
6273 extern EMACS_TIME timer_check ();
6274 extern int timers_run;
6276 Lisp_Object QCtype;
6278 /* As described above, except assuming that there are no subprocesses:
6280 Wait for timeout to elapse and/or keyboard input to be available.
6282 time_limit is:
6283 timeout in seconds, or
6284 zero for no limit, or
6285 -1 means gobble data immediately available but don't wait for any.
6287 read_kbd is a Lisp_Object:
6288 0 to ignore keyboard input, or
6289 1 to return when input is available, or
6290 -1 means caller will actually read the input, so don't throw to
6291 the quit handler.
6292 a cons cell, meaning wait until its car is non-nil
6293 (and gobble terminal input into the buffer if any arrives), or
6294 We know that read_kbd will never be a Lisp_Process, since
6295 `subprocesses' isn't defined.
6297 do_display != 0 means redisplay should be done to show subprocess
6298 output that arrives.
6300 Return true iff we received input from any process. */
6303 wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
6304 int time_limit, microsecs;
6305 Lisp_Object read_kbd;
6306 int do_display;
6308 register int nfds;
6309 EMACS_TIME end_time, timeout;
6310 SELECT_TYPE waitchannels;
6311 int xerrno;
6312 /* Either nil or a cons cell, the car of which is of interest and
6313 may be changed outside of this routine. */
6314 Lisp_Object wait_for_cell = Qnil;
6316 /* If waiting for non-nil in a cell, record where. */
6317 if (CONSP (read_kbd))
6319 wait_for_cell = read_kbd;
6320 XSETFASTINT (read_kbd, 0);
6323 /* What does time_limit really mean? */
6324 if (time_limit || microsecs)
6326 EMACS_GET_TIME (end_time);
6327 EMACS_SET_SECS_USECS (timeout, time_limit, microsecs);
6328 EMACS_ADD_TIME (end_time, end_time, timeout);
6331 /* Turn off periodic alarms (in case they are in use)
6332 and then turn off any other atimers,
6333 because the select emulator uses alarms. */
6334 stop_polling ();
6335 turn_on_atimers (0);
6337 while (1)
6339 int timeout_reduced_for_timers = 0;
6341 /* If calling from keyboard input, do not quit
6342 since we want to return C-g as an input character.
6343 Otherwise, do pending quit if requested. */
6344 if (XINT (read_kbd) >= 0)
6345 QUIT;
6347 /* Exit now if the cell we're waiting for became non-nil. */
6348 if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
6349 break;
6351 /* Compute time from now till when time limit is up */
6352 /* Exit if already run out */
6353 if (time_limit == -1)
6355 /* -1 specified for timeout means
6356 gobble output available now
6357 but don't wait at all. */
6359 EMACS_SET_SECS_USECS (timeout, 0, 0);
6361 else if (time_limit || microsecs)
6363 EMACS_GET_TIME (timeout);
6364 EMACS_SUB_TIME (timeout, end_time, timeout);
6365 if (EMACS_TIME_NEG_P (timeout))
6366 break;
6368 else
6370 EMACS_SET_SECS_USECS (timeout, 100000, 0);
6373 /* If our caller will not immediately handle keyboard events,
6374 run timer events directly.
6375 (Callers that will immediately read keyboard events
6376 call timer_delay on their own.) */
6377 if (NILP (wait_for_cell))
6379 EMACS_TIME timer_delay;
6383 int old_timers_run = timers_run;
6384 timer_delay = timer_check (1);
6385 if (timers_run != old_timers_run && do_display)
6386 /* We must retry, since a timer may have requeued itself
6387 and that could alter the time delay. */
6388 redisplay_preserve_echo_area (14);
6389 else
6390 break;
6392 while (!detect_input_pending ());
6394 /* If there is unread keyboard input, also return. */
6395 if (XINT (read_kbd) != 0
6396 && requeued_events_pending_p ())
6397 break;
6399 if (! EMACS_TIME_NEG_P (timer_delay) && time_limit != -1)
6401 EMACS_TIME difference;
6402 EMACS_SUB_TIME (difference, timer_delay, timeout);
6403 if (EMACS_TIME_NEG_P (difference))
6405 timeout = timer_delay;
6406 timeout_reduced_for_timers = 1;
6411 /* Cause C-g and alarm signals to take immediate action,
6412 and cause input available signals to zero out timeout. */
6413 if (XINT (read_kbd) < 0)
6414 set_waiting_for_input (&timeout);
6416 /* Wait till there is something to do. */
6418 if (! XINT (read_kbd) && NILP (wait_for_cell))
6419 FD_ZERO (&waitchannels);
6420 else
6421 FD_SET (0, &waitchannels);
6423 /* If a frame has been newly mapped and needs updating,
6424 reprocess its display stuff. */
6425 if (frame_garbaged && do_display)
6427 clear_waiting_for_input ();
6428 redisplay_preserve_echo_area (15);
6429 if (XINT (read_kbd) < 0)
6430 set_waiting_for_input (&timeout);
6433 if (XINT (read_kbd) && detect_input_pending ())
6435 nfds = 0;
6436 FD_ZERO (&waitchannels);
6438 else
6439 nfds = select (1, &waitchannels, (SELECT_TYPE *)0, (SELECT_TYPE *)0,
6440 &timeout);
6442 xerrno = errno;
6444 /* Make C-g and alarm signals set flags again */
6445 clear_waiting_for_input ();
6447 /* If we woke up due to SIGWINCH, actually change size now. */
6448 do_pending_window_change (0);
6450 if (time_limit && nfds == 0 && ! timeout_reduced_for_timers)
6451 /* We waited the full specified time, so return now. */
6452 break;
6454 if (nfds == -1)
6456 /* If the system call was interrupted, then go around the
6457 loop again. */
6458 if (xerrno == EINTR)
6459 FD_ZERO (&waitchannels);
6460 else
6461 error ("select error: %s", emacs_strerror (xerrno));
6463 #ifdef sun
6464 else if (nfds > 0 && (waitchannels & 1) && interrupt_input)
6465 /* System sometimes fails to deliver SIGIO. */
6466 kill (getpid (), SIGIO);
6467 #endif
6468 #ifdef SIGIO
6469 if (XINT (read_kbd) && interrupt_input && (waitchannels & 1))
6470 kill (getpid (), SIGIO);
6471 #endif
6473 /* Check for keyboard input */
6475 if ((XINT (read_kbd) != 0)
6476 && detect_input_pending_run_timers (do_display))
6478 swallow_events (do_display);
6479 if (detect_input_pending_run_timers (do_display))
6480 break;
6483 /* If there is unread keyboard input, also return. */
6484 if (XINT (read_kbd) != 0
6485 && requeued_events_pending_p ())
6486 break;
6488 /* If wait_for_cell. check for keyboard input
6489 but don't run any timers.
6490 ??? (It seems wrong to me to check for keyboard
6491 input at all when wait_for_cell, but the code
6492 has been this way since July 1994.
6493 Try changing this after version 19.31.) */
6494 if (! NILP (wait_for_cell)
6495 && detect_input_pending ())
6497 swallow_events (do_display);
6498 if (detect_input_pending ())
6499 break;
6502 /* Exit now if the cell we're waiting for became non-nil. */
6503 if (! NILP (wait_for_cell) && ! NILP (XCAR (wait_for_cell)))
6504 break;
6507 start_polling ();
6509 return 0;
6513 /* Don't confuse make-docfile by having two doc strings for this function.
6514 make-docfile does not pay attention to #if, for good reason! */
6515 DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0,
6517 (name)
6518 register Lisp_Object name;
6520 return Qnil;
6523 /* Don't confuse make-docfile by having two doc strings for this function.
6524 make-docfile does not pay attention to #if, for good reason! */
6525 DEFUN ("process-inherit-coding-system-flag",
6526 Fprocess_inherit_coding_system_flag, Sprocess_inherit_coding_system_flag,
6527 1, 1, 0,
6529 (process)
6530 register Lisp_Object process;
6532 /* Ignore the argument and return the value of
6533 inherit-process-coding-system. */
6534 return inherit_process_coding_system ? Qt : Qnil;
6537 /* Kill all processes associated with `buffer'.
6538 If `buffer' is nil, kill all processes.
6539 Since we have no subprocesses, this does nothing. */
6541 void
6542 kill_buffer_processes (buffer)
6543 Lisp_Object buffer;
6547 void
6548 init_process ()
6552 void
6553 syms_of_process ()
6555 QCtype = intern (":type");
6556 staticpro (&QCtype);
6558 defsubr (&Sget_buffer_process);
6559 defsubr (&Sprocess_inherit_coding_system_flag);
6563 #endif /* not subprocesses */