1 /* Asynchronous subprocess control for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 96, 98, 1999
3 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)
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 */
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. */
40 #include <sys/types.h> /* some typedefs are used in sys/file.h */
47 #if defined(WINDOWSNT) || defined(UNIX98_PTYS)
50 #endif /* not WINDOWSNT */
52 #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */
53 #include <sys/socket.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 */
60 #endif /* HAVE_SOCKETS */
62 /* TERM is a poor-man's SLIP, used on GNU/Linux. */
67 /* On some systems, e.g. DGUX, inet_addr returns a 'struct in_addr'. */
68 #ifdef HAVE_BROKEN_INET_ADDR
69 #define IN_ADDR struct in_addr
70 #define NUMERIC_ADDR_ERROR (numeric_addr.s_addr == -1)
72 #define IN_ADDR unsigned long
73 #define NUMERIC_ADDR_ERROR (numeric_addr == -1)
76 #if defined(BSD_SYSTEM) || defined(STRIDE)
77 #include <sys/ioctl.h>
78 #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5)
80 #endif /* HAVE_PTYS and no O_NDELAY */
81 #endif /* BSD_SYSTEM || STRIDE */
83 #ifdef BROKEN_O_NONBLOCK
85 #endif /* BROKEN_O_NONBLOCK */
92 #include <sys/sysmacros.h> /* for "minor" */
104 #include "termhooks.h"
105 #include "termopts.h"
106 #include "commands.h"
107 #include "keyboard.h"
109 #include "blockinput.h"
110 #include "dispextern.h"
111 #include "composite.h"
114 #define max(a, b) ((a) > (b) ? (a) : (b))
116 Lisp_Object Qprocessp
;
117 Lisp_Object Qrun
, Qstop
, Qsignal
, Qopen
, Qclosed
;
118 Lisp_Object Qlast_nonmenu_event
;
119 /* Qexit is declared and initialized in eval.c. */
121 /* a process object is a network connection when its childp field is neither
122 Qt nor Qnil but is instead a cons cell (HOSTNAME PORTNUM). */
125 #define NETCONN_P(p) (GC_CONSP (XPROCESS (p)->childp))
127 #define NETCONN_P(p) 0
128 #endif /* HAVE_SOCKETS */
130 /* Define first descriptor number available for subprocesses. */
132 #define FIRST_PROC_DESC 1
134 #define FIRST_PROC_DESC 3
137 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
140 #if !defined (SIGCHLD) && defined (SIGCLD)
141 #define SIGCHLD SIGCLD
144 #include "syssignal.h"
148 extern void set_waiting_for_input
P_ ((EMACS_TIME
*));
154 extern char *sys_errlist
[];
161 /* t means use pty, nil means use a pipe,
162 maybe other values to come. */
163 static Lisp_Object Vprocess_connection_type
;
167 #include <sys/socket.h>
171 /* These next two vars are non-static since sysdep.c uses them in the
172 emulation of `select'. */
173 /* Number of events of change of status of a process. */
175 /* Number of events for which the user or sentinel has been notified. */
178 #include "sysselect.h"
180 extern int keyboard_bit_set
P_ ((SELECT_TYPE
*));
182 /* If we support a window system, turn on the code to poll periodically
183 to detect C-g. It isn't actually used when doing interrupt input. */
184 #ifdef HAVE_WINDOW_SYSTEM
185 #define POLL_FOR_INPUT
188 /* Mask of bits indicating the descriptors that we wait for input on. */
190 static SELECT_TYPE input_wait_mask
;
192 /* Mask that excludes keyboard input descriptor (s). */
194 static SELECT_TYPE non_keyboard_wait_mask
;
196 /* Mask that excludes process input descriptor (s). */
198 static SELECT_TYPE non_process_wait_mask
;
200 /* The largest descriptor currently in use for a process object. */
201 static int max_process_desc
;
203 /* The largest descriptor currently in use for keyboard input. */
204 static int max_keyboard_desc
;
206 /* Nonzero means delete a process right away if it exits. */
207 static int delete_exited_processes
;
209 /* Indexed by descriptor, gives the process (if any) for that descriptor */
210 Lisp_Object chan_process
[MAXDESC
];
212 /* Alist of elements (NAME . PROCESS) */
213 Lisp_Object Vprocess_alist
;
215 /* Buffered-ahead input char from process, indexed by channel.
216 -1 means empty (no char is buffered).
217 Used on sys V where the only way to tell if there is any
218 output from the process is to read at least one char.
219 Always -1 on systems that support FIONREAD. */
221 /* Don't make static; need to access externally. */
222 int proc_buffered_char
[MAXDESC
];
224 /* Table of `struct coding-system' for each process. */
225 static struct coding_system
*proc_decode_coding_system
[MAXDESC
];
226 static struct coding_system
*proc_encode_coding_system
[MAXDESC
];
228 static Lisp_Object
get_process ();
230 extern EMACS_TIME
timer_check ();
231 extern int timers_run
;
233 /* Maximum number of bytes to send to a pty without an eof. */
234 static int pty_max_bytes
;
236 extern Lisp_Object Vfile_name_coding_system
, Vdefault_file_name_coding_system
;
239 /* The file name of the pty opened by allocate_pty. */
241 static char pty_name
[24];
244 /* Compute the Lisp form of the process status, p->status, from
245 the numeric status that was returned by `wait'. */
247 Lisp_Object
status_convert ();
251 struct Lisp_Process
*p
;
253 union { int i
; WAITTYPE wt
; } u
;
254 u
.i
= XFASTINT (p
->raw_status_low
) + (XFASTINT (p
->raw_status_high
) << 16);
255 p
->status
= status_convert (u
.wt
);
256 p
->raw_status_low
= Qnil
;
257 p
->raw_status_high
= Qnil
;
260 /* Convert a process status word in Unix format to
261 the list that we use internally. */
268 return Fcons (Qstop
, Fcons (make_number (WSTOPSIG (w
)), Qnil
));
269 else if (WIFEXITED (w
))
270 return Fcons (Qexit
, Fcons (make_number (WRETCODE (w
)),
271 WCOREDUMP (w
) ? Qt
: Qnil
));
272 else if (WIFSIGNALED (w
))
273 return Fcons (Qsignal
, Fcons (make_number (WTERMSIG (w
)),
274 WCOREDUMP (w
) ? Qt
: Qnil
));
279 /* Given a status-list, extract the three pieces of information
280 and store them individually through the three pointers. */
283 decode_status (l
, symbol
, code
, coredump
)
301 *code
= XFASTINT (XCAR (tem
));
303 *coredump
= !NILP (tem
);
307 /* Return a string describing a process status list. */
310 status_message (status
)
315 Lisp_Object string
, string2
;
317 decode_status (status
, &symbol
, &code
, &coredump
);
319 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qstop
))
322 synchronize_system_messages_locale ();
323 signame
= strsignal (code
);
326 string
= build_string (signame
);
327 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
328 XSTRING (string
)->data
[0] = DOWNCASE (XSTRING (string
)->data
[0]);
329 return concat2 (string
, string2
);
331 else if (EQ (symbol
, Qexit
))
334 return build_string ("finished\n");
335 string
= Fnumber_to_string (make_number (code
));
336 string2
= build_string (coredump
? " (core dumped)\n" : "\n");
337 return concat2 (build_string ("exited abnormally with code "),
338 concat2 (string
, string2
));
341 return Fcopy_sequence (Fsymbol_name (symbol
));
346 /* Open an available pty, returning a file descriptor.
347 Return -1 on failure.
348 The file name of the terminal corresponding to the pty
349 is left in the variable pty_name. */
358 /* Some systems name their pseudoterminals so that there are gaps in
359 the usual sequence - for example, on HP9000/S700 systems, there
360 are no pseudoterminals with names ending in 'f'. So we wait for
361 three failures in a row before deciding that we've reached the
363 int failed_count
= 0;
368 for (c
= FIRST_PTY_LETTER
; c
<= 'z'; c
++)
369 for (i
= 0; i
< 16; i
++)
372 #ifdef PTY_NAME_SPRINTF
375 sprintf (pty_name
, "/dev/pty%c%x", c
, i
);
376 #endif /* no PTY_NAME_SPRINTF */
380 #else /* no PTY_OPEN */
382 /* Unusual IRIS code */
383 *ptyv
= emacs_open ("/dev/ptc", O_RDWR
| O_NDELAY
, 0);
386 if (fstat (fd
, &stb
) < 0)
389 if (stat (pty_name
, &stb
) < 0)
392 if (failed_count
>= 3)
398 fd
= emacs_open (pty_name
, O_RDWR
| O_NONBLOCK
, 0);
400 fd
= emacs_open (pty_name
, O_RDWR
| O_NDELAY
, 0);
402 #endif /* not IRIS */
403 #endif /* no PTY_OPEN */
407 /* check to make certain that both sides are available
408 this avoids a nasty yet stupid bug in rlogins */
409 #ifdef PTY_TTY_NAME_SPRINTF
412 sprintf (pty_name
, "/dev/tty%c%x", c
, i
);
413 #endif /* no PTY_TTY_NAME_SPRINTF */
415 if (access (pty_name
, 6) != 0)
418 #if !defined(IRIS) && !defined(__sgi)
424 #endif /* not UNIPLUS */
431 #endif /* HAVE_PTYS */
437 struct Lisp_Vector
*vec
;
438 register Lisp_Object val
, tem
, name1
;
439 register struct Lisp_Process
*p
;
443 vec
= allocate_vectorlike ((EMACS_INT
) VECSIZE (struct Lisp_Process
));
444 for (i
= 0; i
< VECSIZE (struct Lisp_Process
); i
++)
445 vec
->contents
[i
] = Qnil
;
446 vec
->size
= VECSIZE (struct Lisp_Process
);
447 p
= (struct Lisp_Process
*)vec
;
449 XSETINT (p
->infd
, -1);
450 XSETINT (p
->outfd
, -1);
451 XSETFASTINT (p
->pid
, 0);
452 XSETFASTINT (p
->tick
, 0);
453 XSETFASTINT (p
->update_tick
, 0);
454 p
->raw_status_low
= Qnil
;
455 p
->raw_status_high
= Qnil
;
457 p
->mark
= Fmake_marker ();
459 /* If name is already in use, modify it until it is unused. */
464 tem
= Fget_process (name1
);
465 if (NILP (tem
)) break;
466 sprintf (suffix
, "<%d>", i
);
467 name1
= concat2 (name
, build_string (suffix
));
471 XSETPROCESS (val
, p
);
472 Vprocess_alist
= Fcons (Fcons (name
, val
), Vprocess_alist
);
477 remove_process (proc
)
478 register Lisp_Object proc
;
480 register Lisp_Object pair
;
482 pair
= Frassq (proc
, Vprocess_alist
);
483 Vprocess_alist
= Fdelq (pair
, Vprocess_alist
);
485 deactivate_process (proc
);
488 DEFUN ("processp", Fprocessp
, Sprocessp
, 1, 1, 0,
489 "Return t if OBJECT is a process.")
493 return PROCESSP (object
) ? Qt
: Qnil
;
496 DEFUN ("get-process", Fget_process
, Sget_process
, 1, 1, 0,
497 "Return the process named NAME, or nil if there is none.")
499 register Lisp_Object name
;
503 CHECK_STRING (name
, 0);
504 return Fcdr (Fassoc (name
, Vprocess_alist
));
507 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
508 "Return the (or a) process associated with BUFFER.\n\
509 BUFFER may be a buffer or the name of one.")
511 register Lisp_Object buffer
;
513 register Lisp_Object buf
, tail
, proc
;
515 if (NILP (buffer
)) return Qnil
;
516 buf
= Fget_buffer (buffer
);
517 if (NILP (buf
)) return Qnil
;
519 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
521 proc
= Fcdr (Fcar (tail
));
522 if (PROCESSP (proc
) && EQ (XPROCESS (proc
)->buffer
, buf
))
528 /* This is how commands for the user decode process arguments. It
529 accepts a process, a process name, a buffer, a buffer name, or nil.
530 Buffers denote the first process in the buffer, and nil denotes the
535 register Lisp_Object name
;
537 register Lisp_Object proc
, obj
;
540 obj
= Fget_process (name
);
542 obj
= Fget_buffer (name
);
544 error ("Process %s does not exist", XSTRING (name
)->data
);
546 else if (NILP (name
))
547 obj
= Fcurrent_buffer ();
551 /* Now obj should be either a buffer object or a process object.
555 proc
= Fget_buffer_process (obj
);
557 error ("Buffer %s has no process", XSTRING (XBUFFER (obj
)->name
)->data
);
561 CHECK_PROCESS (obj
, 0);
567 DEFUN ("delete-process", Fdelete_process
, Sdelete_process
, 1, 1, 0,
568 "Delete PROCESS: kill it and forget about it immediately.\n\
569 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
570 nil, indicating the current buffer's process.")
572 register Lisp_Object process
;
574 process
= get_process (process
);
575 XPROCESS (process
)->raw_status_low
= Qnil
;
576 XPROCESS (process
)->raw_status_high
= Qnil
;
577 if (NETCONN_P (process
))
579 XPROCESS (process
)->status
= Fcons (Qexit
, Fcons (make_number (0), Qnil
));
580 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
582 else if (XINT (XPROCESS (process
)->infd
) >= 0)
584 Fkill_process (process
, Qnil
);
585 /* Do this now, since remove_process will make sigchld_handler do nothing. */
586 XPROCESS (process
)->status
587 = Fcons (Qsignal
, Fcons (make_number (SIGKILL
), Qnil
));
588 XSETINT (XPROCESS (process
)->tick
, ++process_tick
);
591 remove_process (process
);
595 DEFUN ("process-status", Fprocess_status
, Sprocess_status
, 1, 1, 0,
596 "Return the status of PROCESS.\n\
597 The returned value is one of the following symbols:\n\
598 run -- for a process that is running.\n\
599 stop -- for a process stopped but continuable.\n\
600 exit -- for a process that has exited.\n\
601 signal -- for a process that has got a fatal signal.\n\
602 open -- for a network stream connection that is open.\n\
603 closed -- for a network stream connection that is closed.\n\
604 nil -- if arg is a process name and no such process exists.\n\
605 PROCESS may be a process, a buffer, the name of a process, or\n\
606 nil, indicating the current buffer's process.")
608 register Lisp_Object process
;
610 register struct Lisp_Process
*p
;
611 register Lisp_Object status
;
613 if (STRINGP (process
))
614 process
= Fget_process (process
);
616 process
= get_process (process
);
621 p
= XPROCESS (process
);
622 if (!NILP (p
->raw_status_low
))
626 status
= XCAR (status
);
627 if (NETCONN_P (process
))
629 if (EQ (status
, Qrun
))
631 else if (EQ (status
, Qexit
))
637 DEFUN ("process-exit-status", Fprocess_exit_status
, Sprocess_exit_status
,
639 "Return the exit status of PROCESS or the signal number that killed it.\n\
640 If PROCESS has not yet exited or died, return 0.")
642 register Lisp_Object process
;
644 CHECK_PROCESS (process
, 0);
645 if (!NILP (XPROCESS (process
)->raw_status_low
))
646 update_status (XPROCESS (process
));
647 if (CONSP (XPROCESS (process
)->status
))
648 return XCAR (XCDR (XPROCESS (process
)->status
));
649 return make_number (0);
652 DEFUN ("process-id", Fprocess_id
, Sprocess_id
, 1, 1, 0,
653 "Return the process id of PROCESS.\n\
654 This is the pid of the Unix process which PROCESS uses or talks to.\n\
655 For a network connection, this value is nil.")
657 register Lisp_Object process
;
659 CHECK_PROCESS (process
, 0);
660 return XPROCESS (process
)->pid
;
663 DEFUN ("process-name", Fprocess_name
, Sprocess_name
, 1, 1, 0,
664 "Return the name of PROCESS, as a string.\n\
665 This is the name of the program invoked in PROCESS,\n\
666 possibly modified to make it unique among process names.")
668 register Lisp_Object process
;
670 CHECK_PROCESS (process
, 0);
671 return XPROCESS (process
)->name
;
674 DEFUN ("process-command", Fprocess_command
, Sprocess_command
, 1, 1, 0,
675 "Return the command that was executed to start PROCESS.\n\
676 This is a list of strings, the first string being the program executed\n\
677 and the rest of the strings being the arguments given to it.\n\
678 For a non-child channel, this is nil.")
680 register Lisp_Object process
;
682 CHECK_PROCESS (process
, 0);
683 return XPROCESS (process
)->command
;
686 DEFUN ("process-tty-name", Fprocess_tty_name
, Sprocess_tty_name
, 1, 1, 0,
687 "Return the name of the terminal PROCESS uses, or nil if none.\n\
688 This is the terminal that the process itself reads and writes on,\n\
689 not the name of the pty that Emacs uses to talk with that terminal.")
691 register Lisp_Object process
;
693 CHECK_PROCESS (process
, 0);
694 return XPROCESS (process
)->tty_name
;
697 DEFUN ("set-process-buffer", Fset_process_buffer
, Sset_process_buffer
,
699 "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).")
701 register Lisp_Object process
, buffer
;
703 CHECK_PROCESS (process
, 0);
705 CHECK_BUFFER (buffer
, 1);
706 XPROCESS (process
)->buffer
= buffer
;
710 DEFUN ("process-buffer", Fprocess_buffer
, Sprocess_buffer
,
712 "Return the buffer PROCESS is associated with.\n\
713 Output from PROCESS is inserted in this buffer unless PROCESS has a filter.")
715 register Lisp_Object process
;
717 CHECK_PROCESS (process
, 0);
718 return XPROCESS (process
)->buffer
;
721 DEFUN ("process-mark", Fprocess_mark
, Sprocess_mark
,
723 "Return the marker for the end of the last output from PROCESS.")
725 register Lisp_Object process
;
727 CHECK_PROCESS (process
, 0);
728 return XPROCESS (process
)->mark
;
731 DEFUN ("set-process-filter", Fset_process_filter
, Sset_process_filter
,
733 "Give PROCESS the filter function FILTER; nil means no filter.\n\
734 t means stop accepting output from the process.\n\
735 When a process has a filter, each time it does output\n\
736 the entire string of output is passed to the filter.\n\
737 The filter gets two arguments: the process and the string of output.\n\
738 If the process has a filter, its buffer is not used for output.")
740 register Lisp_Object process
, filter
;
742 CHECK_PROCESS (process
, 0);
745 FD_CLR (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
746 FD_CLR (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
748 else if (EQ (XPROCESS (process
)->filter
, Qt
))
750 FD_SET (XINT (XPROCESS (process
)->infd
), &input_wait_mask
);
751 FD_SET (XINT (XPROCESS (process
)->infd
), &non_keyboard_wait_mask
);
753 XPROCESS (process
)->filter
= filter
;
757 DEFUN ("process-filter", Fprocess_filter
, Sprocess_filter
,
759 "Returns the filter function of PROCESS; nil if none.\n\
760 See `set-process-filter' for more info on filter functions.")
762 register Lisp_Object process
;
764 CHECK_PROCESS (process
, 0);
765 return XPROCESS (process
)->filter
;
768 DEFUN ("set-process-sentinel", Fset_process_sentinel
, Sset_process_sentinel
,
770 "Give PROCESS the sentinel SENTINEL; nil for none.\n\
771 The sentinel is called as a function when the process changes state.\n\
772 It gets two arguments: the process, and a string describing the change.")
774 register Lisp_Object process
, sentinel
;
776 CHECK_PROCESS (process
, 0);
777 XPROCESS (process
)->sentinel
= sentinel
;
781 DEFUN ("process-sentinel", Fprocess_sentinel
, Sprocess_sentinel
,
783 "Return the sentinel of PROCESS; nil if none.\n\
784 See `set-process-sentinel' for more info on sentinels.")
786 register Lisp_Object process
;
788 CHECK_PROCESS (process
, 0);
789 return XPROCESS (process
)->sentinel
;
792 DEFUN ("set-process-window-size", Fset_process_window_size
,
793 Sset_process_window_size
, 3, 3, 0,
794 "Tell PROCESS that it has logical window size HEIGHT and WIDTH.")
795 (process
, height
, width
)
796 register Lisp_Object process
, height
, width
;
798 CHECK_PROCESS (process
, 0);
799 CHECK_NATNUM (height
, 0);
800 CHECK_NATNUM (width
, 0);
801 if (set_window_size (XINT (XPROCESS (process
)->infd
),
802 XINT (height
), XINT (width
)) <= 0)
808 DEFUN ("set-process-inherit-coding-system-flag",
809 Fset_process_inherit_coding_system_flag
,
810 Sset_process_inherit_coding_system_flag
, 2, 2, 0,
811 "Determine whether buffer of PROCESS will inherit coding-system.\n\
812 If the second argument FLAG is non-nil, then the variable\n\
813 `buffer-file-coding-system' of the buffer associated with PROCESS\n\
814 will be bound to the value of the coding system used to decode\n\
815 the process output.\n\
817 This is useful when the coding system specified for the process buffer\n\
818 leaves either the character code conversion or the end-of-line conversion\n\
819 unspecified, or if the coding system used to decode the process output\n\
820 is more appropriate for saving the process buffer.\n\
822 Binding the variable `inherit-process-coding-system' to non-nil before\n\
823 starting the process is an alternative way of setting the inherit flag\n\
824 for the process which will run.")
826 register Lisp_Object process
, flag
;
828 CHECK_PROCESS (process
, 0);
829 XPROCESS (process
)->inherit_coding_system_flag
= flag
;
833 DEFUN ("process-inherit-coding-system-flag",
834 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
836 "Return the value of inherit-coding-system flag for PROCESS.\n\
837 If this flag is t, `buffer-file-coding-system' of the buffer\n\
838 associated with PROCESS will inherit the coding system used to decode\n\
839 the process output.")
841 register Lisp_Object process
;
843 CHECK_PROCESS (process
, 0);
844 return XPROCESS (process
)->inherit_coding_system_flag
;
847 DEFUN ("process-kill-without-query", Fprocess_kill_without_query
,
848 Sprocess_kill_without_query
, 1, 2, 0,
849 "Say no query needed if PROCESS is running when Emacs is exited.\n\
850 Optional second argument if non-nil says to require a query.\n\
851 Value is t if a query was formerly required.")
853 register Lisp_Object process
, value
;
857 CHECK_PROCESS (process
, 0);
858 tem
= XPROCESS (process
)->kill_without_query
;
859 XPROCESS (process
)->kill_without_query
= Fnull (value
);
864 DEFUN ("process-contact", Fprocess_contact
, Sprocess_contact
,
866 "Return the contact info of PROCESS; t for a real child.\n\
867 For a net connection, the value is a cons cell of the form (HOST SERVICE).")
869 register Lisp_Object process
;
871 CHECK_PROCESS (process
, 0);
872 return XPROCESS (process
)->childp
;
875 #if 0 /* Turned off because we don't currently record this info
876 in the process. Perhaps add it. */
877 DEFUN ("process-connection", Fprocess_connection
, Sprocess_connection
, 1, 1, 0,
878 "Return the connection type of PROCESS.\n\
879 The value is nil for a pipe, t or `pty' for a pty, or `stream' for\n\
880 a socket connection.")
884 return XPROCESS (process
)->type
;
891 register Lisp_Object tail
, tem
;
892 Lisp_Object proc
, minspace
, tem1
;
893 register struct Lisp_Process
*p
;
896 XSETFASTINT (minspace
, 1);
898 set_buffer_internal (XBUFFER (Vstandard_output
));
899 Fbuffer_disable_undo (Vstandard_output
);
901 current_buffer
->truncate_lines
= Qt
;
904 Proc Status Buffer Tty Command\n\
905 ---- ------ ------ --- -------\n", -1);
907 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
911 proc
= Fcdr (Fcar (tail
));
913 if (NILP (p
->childp
))
916 Finsert (1, &p
->name
);
917 Findent_to (make_number (13), minspace
);
919 if (!NILP (p
->raw_status_low
))
922 if (CONSP (p
->status
))
923 symbol
= XCAR (p
->status
);
926 if (EQ (symbol
, Qsignal
))
929 tem
= Fcar (Fcdr (p
->status
));
931 if (XINT (tem
) < NSIG
)
932 write_string (sys_errlist
[XINT (tem
)], -1);
935 Fprinc (symbol
, Qnil
);
937 else if (NETCONN_P (proc
))
939 if (EQ (symbol
, Qrun
))
940 write_string ("open", -1);
941 else if (EQ (symbol
, Qexit
))
942 write_string ("closed", -1);
944 Fprinc (symbol
, Qnil
);
947 Fprinc (symbol
, Qnil
);
949 if (EQ (symbol
, Qexit
))
952 tem
= Fcar (Fcdr (p
->status
));
955 sprintf (tembuf
, " %d", (int) XFASTINT (tem
));
956 write_string (tembuf
, -1);
960 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
))
961 remove_process (proc
);
963 Findent_to (make_number (22), minspace
);
964 if (NILP (p
->buffer
))
965 insert_string ("(none)");
966 else if (NILP (XBUFFER (p
->buffer
)->name
))
967 insert_string ("(Killed)");
969 Finsert (1, &XBUFFER (p
->buffer
)->name
);
971 Findent_to (make_number (37), minspace
);
973 if (STRINGP (p
->tty_name
))
974 Finsert (1, &p
->tty_name
);
976 insert_string ("(none)");
978 Findent_to (make_number (49), minspace
);
980 if (NETCONN_P (proc
))
982 sprintf (tembuf
, "(network stream connection to %s)\n",
983 XSTRING (XCAR (p
->childp
))->data
);
984 insert_string (tembuf
);
998 insert_string ("\n");
1004 DEFUN ("list-processes", Flist_processes
, Slist_processes
, 0, 0, "",
1005 "Display a list of all processes.\n\
1006 Any process listed as exited or signaled is actually eliminated\n\
1007 after the listing is made.")
1010 internal_with_output_to_temp_buffer ("*Process List*",
1011 list_processes_1
, Qnil
);
1015 DEFUN ("process-list", Fprocess_list
, Sprocess_list
, 0, 0, 0,
1016 "Return a list of all processes.")
1019 return Fmapcar (Qcdr
, Vprocess_alist
);
1022 /* Starting asynchronous inferior processes. */
1024 static Lisp_Object
start_process_unwind ();
1026 DEFUN ("start-process", Fstart_process
, Sstart_process
, 3, MANY
, 0,
1027 "Start a program in a subprocess. Return the process object for it.\n\
1028 NAME is name for process. It is modified if necessary to make it unique.\n\
1029 BUFFER is the buffer or (buffer-name) to associate with the process.\n\
1030 Process output goes at end of that buffer, unless you specify\n\
1031 an output stream or filter function to handle the output.\n\
1032 BUFFER may be also nil, meaning that this process is not associated\n\
1034 Third arg is program file name. It is searched for in PATH.\n\
1035 Remaining arguments are strings to give program as arguments.")
1038 register Lisp_Object
*args
;
1040 Lisp_Object buffer
, name
, program
, proc
, current_dir
, tem
;
1042 register unsigned char *new_argv
;
1045 register unsigned char **new_argv
;
1048 int count
= specpdl_ptr
- specpdl
;
1052 buffer
= Fget_buffer_create (buffer
);
1054 /* Make sure that the child will be able to chdir to the current
1055 buffer's current directory, or its unhandled equivalent. We
1056 can't just have the child check for an error when it does the
1057 chdir, since it's in a vfork.
1059 We have to GCPRO around this because Fexpand_file_name and
1060 Funhandled_file_name_directory might call a file name handling
1061 function. The argument list is protected by the caller, so all
1062 we really have to worry about is buffer. */
1064 struct gcpro gcpro1
, gcpro2
;
1066 current_dir
= current_buffer
->directory
;
1068 GCPRO2 (buffer
, current_dir
);
1071 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir
),
1073 if (NILP (Ffile_accessible_directory_p (current_dir
)))
1074 report_file_error ("Setting current directory",
1075 Fcons (current_buffer
->directory
, Qnil
));
1081 CHECK_STRING (name
, 0);
1085 CHECK_STRING (program
, 2);
1087 proc
= make_process (name
);
1088 /* If an error occurs and we can't start the process, we want to
1089 remove it from the process list. This means that each error
1090 check in create_process doesn't need to call remove_process
1091 itself; it's all taken care of here. */
1092 record_unwind_protect (start_process_unwind
, proc
);
1094 XPROCESS (proc
)->childp
= Qt
;
1095 XPROCESS (proc
)->command_channel_p
= Qnil
;
1096 XPROCESS (proc
)->buffer
= buffer
;
1097 XPROCESS (proc
)->sentinel
= Qnil
;
1098 XPROCESS (proc
)->filter
= Qnil
;
1099 XPROCESS (proc
)->command
= Flist (nargs
- 2, args
+ 2);
1101 /* Make the process marker point into the process buffer (if any). */
1103 set_marker_both (XPROCESS (proc
)->mark
, buffer
,
1104 BUF_ZV (XBUFFER (buffer
)),
1105 BUF_ZV_BYTE (XBUFFER (buffer
)));
1108 /* Decide coding systems for communicating with the process. Here
1109 we don't setup the structure coding_system nor pay attention to
1110 unibyte mode. They are done in create_process. */
1112 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
1113 Lisp_Object coding_systems
= Qt
;
1114 Lisp_Object val
, *args2
;
1115 struct gcpro gcpro1
, gcpro2
;
1117 val
= Vcoding_system_for_read
;
1120 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
1121 args2
[0] = Qstart_process
;
1122 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1123 GCPRO2 (proc
, current_dir
);
1124 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1126 if (CONSP (coding_systems
))
1127 val
= XCAR (coding_systems
);
1128 else if (CONSP (Vdefault_process_coding_system
))
1129 val
= XCAR (Vdefault_process_coding_system
);
1131 XPROCESS (proc
)->decode_coding_system
= val
;
1133 val
= Vcoding_system_for_write
;
1136 if (EQ (coding_systems
, Qt
))
1138 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof args2
);
1139 args2
[0] = Qstart_process
;
1140 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1141 GCPRO2 (proc
, current_dir
);
1142 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1145 if (CONSP (coding_systems
))
1146 val
= XCDR (coding_systems
);
1147 else if (CONSP (Vdefault_process_coding_system
))
1148 val
= XCDR (Vdefault_process_coding_system
);
1150 XPROCESS (proc
)->encode_coding_system
= val
;
1154 /* Make a one member argv with all args concatenated
1155 together separated by a blank. */
1156 len
= STRING_BYTES (XSTRING (program
)) + 2;
1157 for (i
= 3; i
< nargs
; i
++)
1160 CHECK_STRING (tem
, i
);
1161 len
+= STRING_BYTES (XSTRING (tem
)) + 1; /* count the blank */
1163 new_argv
= (unsigned char *) alloca (len
);
1164 strcpy (new_argv
, XSTRING (program
)->data
);
1165 for (i
= 3; i
< nargs
; i
++)
1168 CHECK_STRING (tem
, i
);
1169 strcat (new_argv
, " ");
1170 strcat (new_argv
, XSTRING (tem
)->data
);
1172 /* Need to add code here to check for program existence on VMS */
1175 new_argv
= (unsigned char **) alloca ((nargs
- 1) * sizeof (char *));
1177 /* If program file name is not absolute, search our path for it */
1178 if (!IS_DIRECTORY_SEP (XSTRING (program
)->data
[0])
1179 && !(XSTRING (program
)->size
> 1
1180 && IS_DEVICE_SEP (XSTRING (program
)->data
[1])))
1182 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1185 GCPRO4 (name
, program
, buffer
, current_dir
);
1186 openp (Vexec_path
, program
, EXEC_SUFFIXES
, &tem
, 1);
1189 report_file_error ("Searching for program", Fcons (program
, Qnil
));
1190 tem
= Fexpand_file_name (tem
, Qnil
);
1191 tem
= ENCODE_FILE (tem
);
1192 new_argv
[0] = XSTRING (tem
)->data
;
1196 if (!NILP (Ffile_directory_p (program
)))
1197 error ("Specified program for new process is a directory");
1199 tem
= ENCODE_FILE (program
);
1200 new_argv
[0] = XSTRING (tem
)->data
;
1203 /* Here we encode arguments by the coding system used for sending
1204 data to the process. We don't support using different coding
1205 systems for encoding arguments and for encoding data sent to the
1208 for (i
= 3; i
< nargs
; i
++)
1211 CHECK_STRING (tem
, i
);
1212 if (STRING_MULTIBYTE (tem
))
1213 tem
= (code_convert_string_norecord
1214 (tem
, XPROCESS (proc
)->encode_coding_system
, 1));
1215 new_argv
[i
- 2] = XSTRING (tem
)->data
;
1217 new_argv
[i
- 2] = 0;
1218 #endif /* not VMS */
1220 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
1221 XPROCESS (proc
)->decoding_carryover
= make_number (0);
1222 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
1223 XPROCESS (proc
)->encoding_carryover
= make_number (0);
1225 XPROCESS (proc
)->inherit_coding_system_flag
1226 = (NILP (buffer
) || !inherit_process_coding_system
1229 create_process (proc
, (char **) new_argv
, current_dir
);
1231 return unbind_to (count
, proc
);
1234 /* This function is the unwind_protect form for Fstart_process. If
1235 PROC doesn't have its pid set, then we know someone has signaled
1236 an error and the process wasn't started successfully, so we should
1237 remove it from the process list. */
1239 start_process_unwind (proc
)
1242 if (!PROCESSP (proc
))
1245 /* Was PROC started successfully? */
1246 if (XINT (XPROCESS (proc
)->pid
) <= 0)
1247 remove_process (proc
);
1253 create_process_1 (timer
)
1254 struct atimer
*timer
;
1256 /* Nothing to do. */
1260 #if 0 /* This doesn't work; see the note before sigchld_handler. */
1263 /* Mimic blocking of signals on system V, which doesn't really have it. */
1265 /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */
1266 int sigchld_deferred
;
1269 create_process_sigchld ()
1271 signal (SIGCHLD
, create_process_sigchld
);
1273 sigchld_deferred
= 1;
1279 #ifndef VMS /* VMS version of this function is in vmsproc.c. */
1281 create_process (process
, new_argv
, current_dir
)
1282 Lisp_Object process
;
1284 Lisp_Object current_dir
;
1286 int pid
, inchannel
, outchannel
;
1288 #ifdef POSIX_SIGNALS
1291 struct sigaction sigint_action
;
1292 struct sigaction sigquit_action
;
1294 struct sigaction sighup_action
;
1296 #else /* !POSIX_SIGNALS */
1299 SIGTYPE (*sigchld
)();
1302 #endif /* !POSIX_SIGNALS */
1303 /* Use volatile to protect variables from being clobbered by longjmp. */
1304 volatile int forkin
, forkout
;
1305 volatile int pty_flag
= 0;
1307 extern char **environ
;
1309 Lisp_Object buffer
= XPROCESS (process
)->buffer
;
1311 inchannel
= outchannel
= -1;
1314 if (!NILP (Vprocess_connection_type
))
1315 outchannel
= inchannel
= allocate_pty ();
1320 /* On USG systems it does not work to open the pty's tty here
1321 and then close and reopen it in the child. */
1323 /* Don't let this terminal become our controlling terminal
1324 (in case we don't have one). */
1325 forkout
= forkin
= emacs_open (pty_name
, O_RDWR
| O_NOCTTY
, 0);
1327 forkout
= forkin
= emacs_open (pty_name
, O_RDWR
, 0);
1330 report_file_error ("Opening pty", Qnil
);
1332 forkin
= forkout
= -1;
1333 #endif /* not USG */
1337 #endif /* HAVE_PTYS */
1340 if (socketpair (AF_UNIX
, SOCK_STREAM
, 0, sv
) < 0)
1341 report_file_error ("Opening socketpair", Qnil
);
1342 outchannel
= inchannel
= sv
[0];
1343 forkout
= forkin
= sv
[1];
1345 #else /* not SKTPAIR */
1350 report_file_error ("Creating pipe", Qnil
);
1356 emacs_close (inchannel
);
1357 emacs_close (forkout
);
1358 report_file_error ("Creating pipe", Qnil
);
1363 #endif /* not SKTPAIR */
1366 /* Replaced by close_process_descs */
1367 set_exclusive_use (inchannel
);
1368 set_exclusive_use (outchannel
);
1371 /* Stride people say it's a mystery why this is needed
1372 as well as the O_NDELAY, but that it fails without this. */
1373 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS))
1376 ioctl (inchannel
, FIONBIO
, &one
);
1381 fcntl (inchannel
, F_SETFL
, O_NONBLOCK
);
1382 fcntl (outchannel
, F_SETFL
, O_NONBLOCK
);
1385 fcntl (inchannel
, F_SETFL
, O_NDELAY
);
1386 fcntl (outchannel
, F_SETFL
, O_NDELAY
);
1390 /* Record this as an active process, with its channels.
1391 As a result, child_setup will close Emacs's side of the pipes. */
1392 chan_process
[inchannel
] = process
;
1393 XSETINT (XPROCESS (process
)->infd
, inchannel
);
1394 XSETINT (XPROCESS (process
)->outfd
, outchannel
);
1395 /* Record the tty descriptor used in the subprocess. */
1397 XPROCESS (process
)->subtty
= Qnil
;
1399 XSETFASTINT (XPROCESS (process
)->subtty
, forkin
);
1400 XPROCESS (process
)->pty_flag
= (pty_flag
? Qt
: Qnil
);
1401 XPROCESS (process
)->status
= Qrun
;
1402 if (!proc_decode_coding_system
[inchannel
])
1403 proc_decode_coding_system
[inchannel
]
1404 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1405 setup_coding_system (XPROCESS (process
)->decode_coding_system
,
1406 proc_decode_coding_system
[inchannel
]);
1407 if (!proc_encode_coding_system
[outchannel
])
1408 proc_encode_coding_system
[outchannel
]
1409 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
1410 setup_coding_system (XPROCESS (process
)->encode_coding_system
,
1411 proc_encode_coding_system
[outchannel
]);
1413 /* Delay interrupts until we have a chance to store
1414 the new fork's pid in its process structure */
1415 #ifdef POSIX_SIGNALS
1416 sigemptyset (&blocked
);
1418 sigaddset (&blocked
, SIGCHLD
);
1421 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
1422 this sets the parent's signal handlers as well as the child's.
1423 So delay all interrupts whose handlers the child might munge,
1424 and record the current handlers so they can be restored later. */
1425 sigaddset (&blocked
, SIGINT
); sigaction (SIGINT
, 0, &sigint_action
);
1426 sigaddset (&blocked
, SIGQUIT
); sigaction (SIGQUIT
, 0, &sigquit_action
);
1428 sigaddset (&blocked
, SIGHUP
); sigaction (SIGHUP
, 0, &sighup_action
);
1430 #endif /* HAVE_VFORK */
1431 sigprocmask (SIG_BLOCK
, &blocked
, &procmask
);
1432 #else /* !POSIX_SIGNALS */
1436 #else /* not BSD4_1 */
1437 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1438 sigsetmask (sigmask (SIGCHLD
));
1439 #else /* ordinary USG */
1441 sigchld_deferred
= 0;
1442 sigchld
= signal (SIGCHLD
, create_process_sigchld
);
1444 #endif /* ordinary USG */
1445 #endif /* not BSD4_1 */
1446 #endif /* SIGCHLD */
1447 #endif /* !POSIX_SIGNALS */
1449 FD_SET (inchannel
, &input_wait_mask
);
1450 FD_SET (inchannel
, &non_keyboard_wait_mask
);
1451 if (inchannel
> max_process_desc
)
1452 max_process_desc
= inchannel
;
1454 /* Until we store the proper pid, enable sigchld_handler
1455 to recognize an unknown pid as standing for this process.
1456 It is very important not to let this `marker' value stay
1457 in the table after this function has returned; if it does
1458 it might cause call-process to hang and subsequent asynchronous
1459 processes to get their return values scrambled. */
1460 XSETINT (XPROCESS (process
)->pid
, -1);
1465 /* child_setup must clobber environ on systems with true vfork.
1466 Protect it from permanent change. */
1467 char **save_environ
= environ
;
1469 current_dir
= ENCODE_FILE (current_dir
);
1474 #endif /* not WINDOWSNT */
1476 int xforkin
= forkin
;
1477 int xforkout
= forkout
;
1479 #if 0 /* This was probably a mistake--it duplicates code later on,
1480 but fails to handle all the cases. */
1481 /* Make sure SIGCHLD is not blocked in the child. */
1482 sigsetmask (SIGEMPTYMASK
);
1485 /* Make the pty be the controlling terminal of the process. */
1487 /* First, disconnect its current controlling terminal. */
1489 /* We tried doing setsid only if pty_flag, but it caused
1490 process_set_signal to fail on SGI when using a pipe. */
1492 /* Make the pty's terminal the controlling terminal. */
1496 /* We ignore the return value
1497 because faith@cs.unc.edu says that is necessary on Linux. */
1498 ioctl (xforkin
, TIOCSCTTY
, 0);
1501 #else /* not HAVE_SETSID */
1503 /* It's very important to call setpgrp here and no time
1504 afterwards. Otherwise, we lose our controlling tty which
1505 is set when we open the pty. */
1508 #endif /* not HAVE_SETSID */
1509 #if defined (HAVE_TERMIOS) && defined (LDISC1)
1510 if (pty_flag
&& xforkin
>= 0)
1513 tcgetattr (xforkin
, &t
);
1515 if (tcsetattr (xforkin
, TCSANOW
, &t
) < 0)
1516 emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
1519 #if defined (NTTYDISC) && defined (TIOCSETD)
1520 if (pty_flag
&& xforkin
>= 0)
1522 /* Use new line discipline. */
1523 int ldisc
= NTTYDISC
;
1524 ioctl (xforkin
, TIOCSETD
, &ldisc
);
1529 /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
1530 can do TIOCSPGRP only to the process's controlling tty. */
1533 /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
1534 I can't test it since I don't have 4.3. */
1535 int j
= emacs_open ("/dev/tty", O_RDWR
, 0);
1536 ioctl (j
, TIOCNOTTY
, 0);
1539 /* In order to get a controlling terminal on some versions
1540 of BSD, it is necessary to put the process in pgrp 0
1541 before it opens the terminal. */
1549 #endif /* TIOCNOTTY */
1551 #if !defined (RTU) && !defined (UNIPLUS) && !defined (DONT_REOPEN_PTY)
1552 /*** There is a suggestion that this ought to be a
1553 conditional on TIOCSPGRP,
1554 or !(defined (HAVE_SETSID) && defined (TIOCSCTTY)).
1555 Trying the latter gave the wrong results on Debian GNU/Linux 1.1;
1556 that system does seem to need this code, even though
1557 both HAVE_SETSID and TIOCSCTTY are defined. */
1558 /* Now close the pty (if we had it open) and reopen it.
1559 This makes the pty the controlling terminal of the subprocess. */
1562 #ifdef SET_CHILD_PTY_PGRP
1563 int pgrp
= getpid ();
1566 /* I wonder if emacs_close (emacs_open (pty_name, ...))
1569 emacs_close (xforkin
);
1570 xforkout
= xforkin
= emacs_open (pty_name
, O_RDWR
, 0);
1574 emacs_write (1, "Couldn't open the pty terminal ", 31);
1575 emacs_write (1, pty_name
, strlen (pty_name
));
1576 emacs_write (1, "\n", 1);
1580 #ifdef SET_CHILD_PTY_PGRP
1581 ioctl (xforkin
, TIOCSPGRP
, &pgrp
);
1582 ioctl (xforkout
, TIOCSPGRP
, &pgrp
);
1585 #endif /* not UNIPLUS and not RTU and not DONT_REOPEN_PTY */
1587 #ifdef SETUP_SLAVE_PTY
1592 #endif /* SETUP_SLAVE_PTY */
1594 /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
1595 Now reenable it in the child, so it will die when we want it to. */
1597 signal (SIGHUP
, SIG_DFL
);
1599 #endif /* HAVE_PTYS */
1601 signal (SIGINT
, SIG_DFL
);
1602 signal (SIGQUIT
, SIG_DFL
);
1604 /* Stop blocking signals in the child. */
1605 #ifdef POSIX_SIGNALS
1606 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1607 #else /* !POSIX_SIGNALS */
1611 #else /* not BSD4_1 */
1612 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1613 sigsetmask (SIGEMPTYMASK
);
1614 #else /* ordinary USG */
1616 signal (SIGCHLD
, sigchld
);
1618 #endif /* ordinary USG */
1619 #endif /* not BSD4_1 */
1620 #endif /* SIGCHLD */
1621 #endif /* !POSIX_SIGNALS */
1624 child_setup_tty (xforkout
);
1626 pid
= child_setup (xforkin
, xforkout
, xforkout
,
1627 new_argv
, 1, current_dir
);
1628 #else /* not WINDOWSNT */
1629 child_setup (xforkin
, xforkout
, xforkout
,
1630 new_argv
, 1, current_dir
);
1631 #endif /* not WINDOWSNT */
1633 environ
= save_environ
;
1638 /* This runs in the Emacs process. */
1642 emacs_close (forkin
);
1643 if (forkin
!= forkout
&& forkout
>= 0)
1644 emacs_close (forkout
);
1648 /* vfork succeeded. */
1649 XSETFASTINT (XPROCESS (process
)->pid
, pid
);
1652 register_child (pid
, inchannel
);
1653 #endif /* WINDOWSNT */
1655 /* If the subfork execv fails, and it exits,
1656 this close hangs. I don't know why.
1657 So have an interrupt jar it loose. */
1659 struct atimer
*timer
;
1663 EMACS_SET_SECS_USECS (offset
, 1, 0);
1664 timer
= start_atimer (ATIMER_RELATIVE
, offset
, create_process_1
, 0);
1666 XPROCESS (process
)->subtty
= Qnil
;
1668 emacs_close (forkin
);
1670 cancel_atimer (timer
);
1674 if (forkin
!= forkout
&& forkout
>= 0)
1675 emacs_close (forkout
);
1679 XPROCESS (process
)->tty_name
= build_string (pty_name
);
1682 XPROCESS (process
)->tty_name
= Qnil
;
1685 /* Restore the signal state whether vfork succeeded or not.
1686 (We will signal an error, below, if it failed.) */
1687 #ifdef POSIX_SIGNALS
1689 /* Restore the parent's signal handlers. */
1690 sigaction (SIGINT
, &sigint_action
, 0);
1691 sigaction (SIGQUIT
, &sigquit_action
, 0);
1693 sigaction (SIGHUP
, &sighup_action
, 0);
1695 #endif /* HAVE_VFORK */
1696 /* Stop blocking signals in the parent. */
1697 sigprocmask (SIG_SETMASK
, &procmask
, 0);
1698 #else /* !POSIX_SIGNALS */
1702 #else /* not BSD4_1 */
1703 #if defined (BSD_SYSTEM) || defined (UNIPLUS) || defined (HPUX)
1704 sigsetmask (SIGEMPTYMASK
);
1705 #else /* ordinary USG */
1707 signal (SIGCHLD
, sigchld
);
1708 /* Now really handle any of these signals
1709 that came in during this function. */
1710 if (sigchld_deferred
)
1711 kill (getpid (), SIGCHLD
);
1713 #endif /* ordinary USG */
1714 #endif /* not BSD4_1 */
1715 #endif /* SIGCHLD */
1716 #endif /* !POSIX_SIGNALS */
1718 /* Now generate the error if vfork failed. */
1720 report_file_error ("Doing vfork", Qnil
);
1722 #endif /* not VMS */
1726 /* open a TCP network connection to a given HOST/SERVICE. Treated
1727 exactly like a normal process when reading and writing. Only
1728 differences are in status display and process deletion. A network
1729 connection has no PID; you cannot signal it. All you can do is
1730 deactivate and close it via delete-process */
1732 DEFUN ("open-network-stream", Fopen_network_stream
, Sopen_network_stream
,
1734 "Open a TCP connection for a service to a host.\n\
1735 Returns a subprocess-object to represent the connection.\n\
1736 Input and output work as for subprocesses; `delete-process' closes it.\n\
1737 Args are NAME BUFFER HOST SERVICE.\n\
1738 NAME is name for process. It is modified if necessary to make it unique.\n\
1739 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
1740 Process output goes at end of that buffer, unless you specify\n\
1741 an output stream or filter function to handle the output.\n\
1742 BUFFER may be also nil, meaning that this process is not associated\n\
1744 Third arg is name of the host to connect to, or its IP address.\n\
1745 Fourth arg SERVICE is name of the service desired, or an integer\n\
1746 specifying a port number to connect to.")
1747 (name
, buffer
, host
, service
)
1748 Lisp_Object name
, buffer
, host
, service
;
1751 #ifdef HAVE_GETADDRINFO
1752 struct addrinfo hints
, *res
, *lres
;
1755 char *portstring
, portbuf
[128];
1756 #else /* HAVE_GETADDRINFO */
1757 struct sockaddr_in address
;
1758 struct servent
*svc_info
;
1759 struct hostent
*host_info_ptr
, host_info
;
1760 char *(addr_list
[2]);
1761 IN_ADDR numeric_addr
;
1763 #endif /* HAVE_GETADDRINFO */
1764 int s
= -1, outch
, inch
;
1765 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
1767 int count
= specpdl_ptr
- specpdl
;
1771 /* Ensure socket support is loaded if available. */
1772 init_winsock (TRUE
);
1775 GCPRO4 (name
, buffer
, host
, service
);
1776 CHECK_STRING (name
, 0);
1777 CHECK_STRING (host
, 0);
1779 #ifdef HAVE_GETADDRINFO
1780 /* SERVICE can either be a string or int.
1781 Convert to a C string for later use by getaddrinfo. */
1782 if (INTEGERP (service
))
1784 sprintf (portbuf
, "%ld", (long) XINT (service
));
1785 portstring
= portbuf
;
1789 CHECK_STRING (service
, 0);
1790 portstring
= XSTRING (service
)->data
;
1792 #else /* HAVE_GETADDRINFO */
1793 if (INTEGERP (service
))
1794 port
= htons ((unsigned short) XINT (service
));
1797 CHECK_STRING (service
, 0);
1798 svc_info
= getservbyname (XSTRING (service
)->data
, "tcp");
1800 error ("Unknown service \"%s\"", XSTRING (service
)->data
);
1801 port
= svc_info
->s_port
;
1803 #endif /* HAVE_GETADDRINFO */
1806 /* Slow down polling to every ten seconds.
1807 Some kernels have a bug which causes retrying connect to fail
1808 after a connect. Polling can interfere with gethostbyname too. */
1809 #ifdef POLL_FOR_INPUT
1810 record_unwind_protect (unwind_stop_other_atimers
, Qnil
);
1811 bind_polling_period (10);
1815 #ifdef HAVE_GETADDRINFO
1818 memset (&hints
, 0, sizeof (hints
));
1820 hints
.ai_family
= AF_UNSPEC
;
1821 hints
.ai_socktype
= SOCK_STREAM
;
1822 hints
.ai_protocol
= 0;
1823 ret
= getaddrinfo (XSTRING (host
)->data
, portstring
, &hints
, &res
);
1825 #ifdef HAVE_GAI_STRERROR
1826 error ("%s/%s %s", XSTRING (host
)->data
, portstring
, gai_strerror(ret
));
1828 error ("%s/%s getaddrinfo error %d", XSTRING (host
)->data
, portstring
,
1833 /* Do this in case we never enter the for-loop below. */
1834 count1
= specpdl_ptr
- specpdl
;
1837 for (lres
= res
; lres
; lres
= lres
->ai_next
)
1839 s
= socket (lres
->ai_family
, lres
->ai_socktype
, lres
->ai_protocol
);
1846 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1847 when connect is interrupted. So let's not let it get interrupted.
1848 Note we do not turn off polling, because polling is only used
1849 when not interrupt_input, and thus not normally used on the systems
1850 which have this bug. On systems which use polling, there's no way
1851 to quit if polling is turned off. */
1852 if (interrupt_input
)
1855 /* Make us close S if quit. */
1856 count1
= specpdl_ptr
- specpdl
;
1857 record_unwind_protect (close_file_unwind
, make_number (s
));
1864 /* This turns off all alarm-based interrupts; the
1865 bind_polling_period call above doesn't always turn all the
1866 short-interval ones off, especially if interrupt_input is
1869 It'd be nice to be able to control the connect timeout
1870 though. Would non-blocking connect calls be portable? */
1871 turn_on_atimers (0);
1872 ret
= connect (s
, lres
->ai_addr
, lres
->ai_addrlen
);
1874 turn_on_atimers (1);
1876 if (ret
== 0 || xerrno
== EISCONN
)
1877 /* The unwind-protect will be discarded afterwards.
1878 Likewise for immediate_quit. */
1883 if (xerrno
== EINTR
)
1885 if (xerrno
== EADDRINUSE
&& retry
< 20)
1887 /* A delay here is needed on some FreeBSD systems,
1888 and it is harmless, since this retrying takes time anyway
1889 and should be infrequent. */
1890 Fsleep_for (make_number (1), Qnil
);
1895 /* Discard the unwind protect closing S. */
1896 specpdl_ptr
= specpdl
+ count1
;
1897 count1
= specpdl_ptr
- specpdl
;
1906 if (interrupt_input
)
1910 report_file_error ("connection failed",
1911 Fcons (host
, Fcons (name
, Qnil
)));
1914 #else /* not HAVE_GETADDRINFO */
1925 host_info_ptr
= gethostbyname (XSTRING (host
)->data
);
1929 if (! (host_info_ptr
== 0 && h_errno
== TRY_AGAIN
))
1933 Fsleep_for (make_number (1), Qnil
);
1936 if (host_info_ptr
== 0)
1937 /* Attempt to interpret host as numeric inet address */
1939 numeric_addr
= inet_addr ((char *) XSTRING (host
)->data
);
1940 if (NUMERIC_ADDR_ERROR
)
1941 error ("Unknown host \"%s\"", XSTRING (host
)->data
);
1943 host_info_ptr
= &host_info
;
1944 host_info
.h_name
= 0;
1945 host_info
.h_aliases
= 0;
1946 host_info
.h_addrtype
= AF_INET
;
1948 /* Older machines have only one address slot called h_addr.
1949 Newer machines have h_addr_list, but #define h_addr to
1950 be its first element. */
1951 host_info
.h_addr_list
= &(addr_list
[0]);
1953 host_info
.h_addr
= (char*)(&numeric_addr
);
1955 /* numeric_addr isn't null-terminated; it has fixed length. */
1956 host_info
.h_length
= sizeof (numeric_addr
);
1959 bzero (&address
, sizeof address
);
1960 bcopy (host_info_ptr
->h_addr
, (char *) &address
.sin_addr
,
1961 host_info_ptr
->h_length
);
1962 address
.sin_family
= host_info_ptr
->h_addrtype
;
1963 address
.sin_port
= port
;
1965 s
= socket (host_info_ptr
->h_addrtype
, SOCK_STREAM
, 0);
1967 report_file_error ("error creating socket", Fcons (name
, Qnil
));
1969 count1
= specpdl_ptr
- specpdl
;
1970 record_unwind_protect (close_file_unwind
, make_number (s
));
1972 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
1973 when connect is interrupted. So let's not let it get interrupted.
1974 Note we do not turn off polling, because polling is only used
1975 when not interrupt_input, and thus not normally used on the systems
1976 which have this bug. On systems which use polling, there's no way
1977 to quit if polling is turned off. */
1978 if (interrupt_input
)
1986 if (connect (s
, (struct sockaddr
*) &address
, sizeof address
) == -1
1987 && errno
!= EISCONN
)
1995 if (errno
== EADDRINUSE
&& retry
< 20)
1997 /* A delay here is needed on some FreeBSD systems,
1998 and it is harmless, since this retrying takes time anyway
1999 and should be infrequent. */
2000 Fsleep_for (make_number (1), Qnil
);
2005 /* Discard the unwind protect. */
2006 specpdl_ptr
= specpdl
+ count1
;
2010 if (interrupt_input
)
2014 report_file_error ("connection failed",
2015 Fcons (host
, Fcons (name
, Qnil
)));
2018 #endif /* not HAVE_GETADDRINFO */
2022 /* Discard the unwind protect, if any. */
2023 specpdl_ptr
= specpdl
+ count1
;
2025 #ifdef POLL_FOR_INPUT
2026 unbind_to (count
, Qnil
);
2029 if (interrupt_input
)
2033 s
= connect_server (0);
2035 report_file_error ("error creating socket", Fcons (name
, Qnil
));
2036 send_command (s
, C_PORT
, 0, "%s:%d", XSTRING (host
)->data
, ntohs (port
));
2037 send_command (s
, C_DUMB
, 1, 0);
2044 buffer
= Fget_buffer_create (buffer
);
2045 proc
= make_process (name
);
2047 chan_process
[inch
] = proc
;
2050 fcntl (inch
, F_SETFL
, O_NONBLOCK
);
2053 fcntl (inch
, F_SETFL
, O_NDELAY
);
2057 XPROCESS (proc
)->childp
= Fcons (host
, Fcons (service
, Qnil
));
2058 XPROCESS (proc
)->command_channel_p
= Qnil
;
2059 XPROCESS (proc
)->buffer
= buffer
;
2060 XPROCESS (proc
)->sentinel
= Qnil
;
2061 XPROCESS (proc
)->filter
= Qnil
;
2062 XPROCESS (proc
)->command
= Qnil
;
2063 XPROCESS (proc
)->pid
= Qnil
;
2064 XSETINT (XPROCESS (proc
)->infd
, inch
);
2065 XSETINT (XPROCESS (proc
)->outfd
, outch
);
2066 XPROCESS (proc
)->status
= Qrun
;
2067 FD_SET (inch
, &input_wait_mask
);
2068 FD_SET (inch
, &non_keyboard_wait_mask
);
2069 if (inch
> max_process_desc
)
2070 max_process_desc
= inch
;
2073 /* Setup coding systems for communicating with the network stream. */
2074 struct gcpro gcpro1
;
2075 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
2076 Lisp_Object coding_systems
= Qt
;
2077 Lisp_Object args
[5], val
;
2079 if (!NILP (Vcoding_system_for_read
))
2080 val
= Vcoding_system_for_read
;
2081 else if ((!NILP (buffer
) && NILP (XBUFFER (buffer
)->enable_multibyte_characters
))
2082 || (NILP (buffer
) && NILP (buffer_defaults
.enable_multibyte_characters
)))
2083 /* We dare not decode end-of-line format by setting VAL to
2084 Qraw_text, because the existing Emacs Lisp libraries
2085 assume that they receive bare code including a sequene of
2090 args
[0] = Qopen_network_stream
, args
[1] = name
,
2091 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2093 coding_systems
= Ffind_operation_coding_system (5, args
);
2095 if (CONSP (coding_systems
))
2096 val
= XCAR (coding_systems
);
2097 else if (CONSP (Vdefault_process_coding_system
))
2098 val
= XCAR (Vdefault_process_coding_system
);
2102 XPROCESS (proc
)->decode_coding_system
= val
;
2104 if (!NILP (Vcoding_system_for_write
))
2105 val
= Vcoding_system_for_write
;
2106 else if (NILP (current_buffer
->enable_multibyte_characters
))
2110 if (EQ (coding_systems
, Qt
))
2112 args
[0] = Qopen_network_stream
, args
[1] = name
,
2113 args
[2] = buffer
, args
[3] = host
, args
[4] = service
;
2115 coding_systems
= Ffind_operation_coding_system (5, args
);
2118 if (CONSP (coding_systems
))
2119 val
= XCDR (coding_systems
);
2120 else if (CONSP (Vdefault_process_coding_system
))
2121 val
= XCDR (Vdefault_process_coding_system
);
2125 XPROCESS (proc
)->encode_coding_system
= val
;
2128 if (!proc_decode_coding_system
[inch
])
2129 proc_decode_coding_system
[inch
]
2130 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2131 setup_coding_system (XPROCESS (proc
)->decode_coding_system
,
2132 proc_decode_coding_system
[inch
]);
2133 if (!proc_encode_coding_system
[outch
])
2134 proc_encode_coding_system
[outch
]
2135 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
2136 setup_coding_system (XPROCESS (proc
)->encode_coding_system
,
2137 proc_encode_coding_system
[outch
]);
2139 XPROCESS (proc
)->decoding_buf
= make_uninit_string (0);
2140 XPROCESS (proc
)->decoding_carryover
= make_number (0);
2141 XPROCESS (proc
)->encoding_buf
= make_uninit_string (0);
2142 XPROCESS (proc
)->encoding_carryover
= make_number (0);
2144 XPROCESS (proc
)->inherit_coding_system_flag
2145 = (NILP (buffer
) || !inherit_process_coding_system
2151 #endif /* HAVE_SOCKETS */
2154 deactivate_process (proc
)
2157 register int inchannel
, outchannel
;
2158 register struct Lisp_Process
*p
= XPROCESS (proc
);
2160 inchannel
= XINT (p
->infd
);
2161 outchannel
= XINT (p
->outfd
);
2165 /* Beware SIGCHLD hereabouts. */
2166 flush_pending_output (inchannel
);
2169 VMS_PROC_STUFF
*get_vms_process_pointer (), *vs
;
2170 sys$
dassgn (outchannel
);
2171 vs
= get_vms_process_pointer (p
->pid
);
2173 give_back_vms_process_stuff (vs
);
2176 emacs_close (inchannel
);
2177 if (outchannel
>= 0 && outchannel
!= inchannel
)
2178 emacs_close (outchannel
);
2181 XSETINT (p
->infd
, -1);
2182 XSETINT (p
->outfd
, -1);
2183 chan_process
[inchannel
] = Qnil
;
2184 FD_CLR (inchannel
, &input_wait_mask
);
2185 FD_CLR (inchannel
, &non_keyboard_wait_mask
);
2186 if (inchannel
== max_process_desc
)
2189 /* We just closed the highest-numbered process input descriptor,
2190 so recompute the highest-numbered one now. */
2191 max_process_desc
= 0;
2192 for (i
= 0; i
< MAXDESC
; i
++)
2193 if (!NILP (chan_process
[i
]))
2194 max_process_desc
= i
;
2199 /* Close all descriptors currently in use for communication
2200 with subprocess. This is used in a newly-forked subprocess
2201 to get rid of irrelevant descriptors. */
2204 close_process_descs ()
2208 for (i
= 0; i
< MAXDESC
; i
++)
2210 Lisp_Object process
;
2211 process
= chan_process
[i
];
2212 if (!NILP (process
))
2214 int in
= XINT (XPROCESS (process
)->infd
);
2215 int out
= XINT (XPROCESS (process
)->outfd
);
2218 if (out
>= 0 && in
!= out
)
2225 DEFUN ("accept-process-output", Faccept_process_output
, Saccept_process_output
,
2227 "Allow any pending output from subprocesses to be read by Emacs.\n\
2228 It is read into the process' buffers or given to their filter functions.\n\
2229 Non-nil arg PROCESS means do not return until some output has been received\n\
2231 Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\
2232 seconds and microseconds to wait; return after that much time whether\n\
2233 or not there is input.\n\
2234 Return non-nil iff we received any output before the timeout expired.")
2235 (process
, timeout
, timeout_msecs
)
2236 register Lisp_Object process
, timeout
, timeout_msecs
;
2241 if (! NILP (process
))
2242 CHECK_PROCESS (process
, 0);
2244 if (! NILP (timeout_msecs
))
2246 CHECK_NUMBER (timeout_msecs
, 2);
2247 useconds
= XINT (timeout_msecs
);
2248 if (!INTEGERP (timeout
))
2249 XSETINT (timeout
, 0);
2252 int carry
= useconds
/ 1000000;
2254 XSETINT (timeout
, XINT (timeout
) + carry
);
2255 useconds
-= carry
* 1000000;
2257 /* I think this clause is necessary because C doesn't
2258 guarantee a particular rounding direction for negative
2262 XSETINT (timeout
, XINT (timeout
) - 1);
2263 useconds
+= 1000000;
2270 if (! NILP (timeout
))
2272 CHECK_NUMBER (timeout
, 1);
2273 seconds
= XINT (timeout
);
2274 if (seconds
< 0 || (seconds
== 0 && useconds
== 0))
2286 XSETFASTINT (process
, 0);
2289 (wait_reading_process_input (seconds
, useconds
, process
, 0)
2293 /* This variable is different from waiting_for_input in keyboard.c.
2294 It is used to communicate to a lisp process-filter/sentinel (via the
2295 function Fwaiting_for_user_input_p below) whether emacs was waiting
2296 for user-input when that process-filter was called.
2297 waiting_for_input cannot be used as that is by definition 0 when
2298 lisp code is being evalled.
2299 This is also used in record_asynch_buffer_change.
2300 For that purpose, this must be 0
2301 when not inside wait_reading_process_input. */
2302 static int waiting_for_user_input_p
;
2304 /* This is here so breakpoints can be put on it. */
2306 wait_reading_process_input_1 ()
2310 /* Read and dispose of subprocess output while waiting for timeout to
2311 elapse and/or keyboard input to be available.
2314 timeout in seconds, or
2315 zero for no limit, or
2316 -1 means gobble data immediately available but don't wait for any.
2319 an additional duration to wait, measured in microseconds.
2320 If this is nonzero and time_limit is 0, then the timeout
2321 consists of MICROSECS only.
2323 READ_KBD is a lisp value:
2324 0 to ignore keyboard input, or
2325 1 to return when input is available, or
2326 -1 meaning caller will actually read the input, so don't throw to
2327 the quit handler, or
2328 a cons cell, meaning wait until its car is non-nil
2329 (and gobble terminal input into the buffer if any arrives), or
2330 a process object, meaning wait until something arrives from that
2331 process. The return value is true iff we read some input from
2334 DO_DISPLAY != 0 means redisplay should be done to show subprocess
2335 output that arrives.
2337 If READ_KBD is a pointer to a struct Lisp_Process, then the
2338 function returns true iff we received input from that process
2339 before the timeout elapsed.
2340 Otherwise, return true iff we received input from any process. */
2343 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
2344 int time_limit
, microsecs
;
2345 Lisp_Object read_kbd
;
2348 register int channel
, nfds
;
2349 static SELECT_TYPE Available
;
2352 EMACS_TIME timeout
, end_time
;
2354 int wait_channel
= -1;
2355 struct Lisp_Process
*wait_proc
= 0;
2356 int got_some_input
= 0;
2357 Lisp_Object
*wait_for_cell
= 0;
2359 FD_ZERO (&Available
);
2361 /* If read_kbd is a process to watch, set wait_proc and wait_channel
2363 if (PROCESSP (read_kbd
))
2365 wait_proc
= XPROCESS (read_kbd
);
2366 wait_channel
= XINT (wait_proc
->infd
);
2367 XSETFASTINT (read_kbd
, 0);
2370 /* If waiting for non-nil in a cell, record where. */
2371 if (CONSP (read_kbd
))
2373 wait_for_cell
= &XCAR (read_kbd
);
2374 XSETFASTINT (read_kbd
, 0);
2377 waiting_for_user_input_p
= XINT (read_kbd
);
2379 /* Since we may need to wait several times,
2380 compute the absolute time to return at. */
2381 if (time_limit
|| microsecs
)
2383 EMACS_GET_TIME (end_time
);
2384 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
2385 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
2388 /* AlainF 5-Jul-1996
2389 HP-UX 10.10 seem to have problems with signals coming in
2390 Causes "poll: interrupted system call" messages when Emacs is run
2392 Turn off periodic alarms (in case they are in use) */
2393 turn_on_atimers (0);
2398 int timeout_reduced_for_timers
= 0;
2400 /* If calling from keyboard input, do not quit
2401 since we want to return C-g as an input character.
2402 Otherwise, do pending quit if requested. */
2403 if (XINT (read_kbd
) >= 0)
2406 /* Exit now if the cell we're waiting for became non-nil. */
2407 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2410 /* Compute time from now till when time limit is up */
2411 /* Exit if already run out */
2412 if (time_limit
== -1)
2414 /* -1 specified for timeout means
2415 gobble output available now
2416 but don't wait at all. */
2418 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2420 else if (time_limit
|| microsecs
)
2422 EMACS_GET_TIME (timeout
);
2423 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
2424 if (EMACS_TIME_NEG_P (timeout
))
2429 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
2432 /* Normally we run timers here.
2433 But not if wait_for_cell; in those cases,
2434 the wait is supposed to be short,
2435 and those callers cannot handle running arbitrary Lisp code here. */
2436 if (! wait_for_cell
)
2438 EMACS_TIME timer_delay
;
2442 int old_timers_run
= timers_run
;
2443 timer_delay
= timer_check (1);
2444 if (timers_run
!= old_timers_run
&& do_display
)
2445 /* We must retry, since a timer may have requeued itself
2446 and that could alter the time_delay. */
2447 redisplay_preserve_echo_area (9);
2451 while (!detect_input_pending ());
2453 /* If there is unread keyboard input, also return. */
2454 if (XINT (read_kbd
) != 0
2455 && requeued_events_pending_p ())
2458 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
2460 EMACS_TIME difference
;
2461 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
2462 if (EMACS_TIME_NEG_P (difference
))
2464 timeout
= timer_delay
;
2465 timeout_reduced_for_timers
= 1;
2468 /* If time_limit is -1, we are not going to wait at all. */
2469 else if (time_limit
!= -1)
2471 /* This is so a breakpoint can be put here. */
2472 wait_reading_process_input_1 ();
2476 /* Cause C-g and alarm signals to take immediate action,
2477 and cause input available signals to zero out timeout.
2479 It is important that we do this before checking for process
2480 activity. If we get a SIGCHLD after the explicit checks for
2481 process activity, timeout is the only way we will know. */
2482 if (XINT (read_kbd
) < 0)
2483 set_waiting_for_input (&timeout
);
2485 /* If status of something has changed, and no input is
2486 available, notify the user of the change right away. After
2487 this explicit check, we'll let the SIGCHLD handler zap
2488 timeout to get our attention. */
2489 if (update_tick
!= process_tick
&& do_display
)
2491 Atemp
= input_wait_mask
;
2492 EMACS_SET_SECS_USECS (timeout
, 0, 0);
2493 if ((select (max (max_process_desc
, max_keyboard_desc
) + 1,
2494 &Atemp
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2498 /* It's okay for us to do this and then continue with
2499 the loop, since timeout has already been zeroed out. */
2500 clear_waiting_for_input ();
2505 /* Don't wait for output from a non-running process. */
2506 if (wait_proc
!= 0 && !NILP (wait_proc
->raw_status_low
))
2507 update_status (wait_proc
);
2509 && ! EQ (wait_proc
->status
, Qrun
))
2511 int nread
, total_nread
= 0;
2513 clear_waiting_for_input ();
2514 XSETPROCESS (proc
, wait_proc
);
2516 /* Read data from the process, until we exhaust it. */
2517 while (XINT (wait_proc
->infd
) >= 0)
2519 nread
= read_process_output (proc
, XINT (wait_proc
->infd
));
2525 total_nread
+= nread
;
2527 else if (nread
== -1 && EIO
== errno
)
2531 else if (nread
== -1 && EAGAIN
== errno
)
2535 else if (nread
== -1 && EWOULDBLOCK
== errno
)
2539 if (total_nread
> 0 && do_display
)
2540 redisplay_preserve_echo_area (10);
2545 /* Wait till there is something to do */
2548 Available
= non_process_wait_mask
;
2549 else if (! XINT (read_kbd
))
2550 Available
= non_keyboard_wait_mask
;
2552 Available
= input_wait_mask
;
2554 /* If frame size has changed or the window is newly mapped,
2555 redisplay now, before we start to wait. There is a race
2556 condition here; if a SIGIO arrives between now and the select
2557 and indicates that a frame is trashed, the select may block
2558 displaying a trashed screen. */
2559 if (frame_garbaged
&& do_display
)
2561 clear_waiting_for_input ();
2562 redisplay_preserve_echo_area (11);
2563 if (XINT (read_kbd
) < 0)
2564 set_waiting_for_input (&timeout
);
2567 if (XINT (read_kbd
) && detect_input_pending ())
2570 FD_ZERO (&Available
);
2573 nfds
= select (max (max_process_desc
, max_keyboard_desc
) + 1,
2574 &Available
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
2579 /* Make C-g and alarm signals set flags again */
2580 clear_waiting_for_input ();
2582 /* If we woke up due to SIGWINCH, actually change size now. */
2583 do_pending_window_change (0);
2585 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
2586 /* We wanted the full specified time, so return now. */
2590 if (xerrno
== EINTR
)
2591 FD_ZERO (&Available
);
2593 /* Ultrix select seems to return ENOMEM when it is
2594 interrupted. Treat it just like EINTR. Bleah. Note
2595 that we want to test for the "ultrix" CPP symbol, not
2596 "__ultrix__"; the latter is only defined under GCC, but
2597 not by DEC's bundled CC. -JimB */
2598 else if (xerrno
== ENOMEM
)
2599 FD_ZERO (&Available
);
2602 /* This happens for no known reason on ALLIANT.
2603 I am guessing that this is the right response. -- RMS. */
2604 else if (xerrno
== EFAULT
)
2605 FD_ZERO (&Available
);
2607 else if (xerrno
== EBADF
)
2610 /* AIX doesn't handle PTY closure the same way BSD does. On AIX,
2611 the child's closure of the pts gives the parent a SIGHUP, and
2612 the ptc file descriptor is automatically closed,
2613 yielding EBADF here or at select() call above.
2614 So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF
2615 in m/ibmrt-aix.h), and here we just ignore the select error.
2616 Cleanup occurs c/o status_notify after SIGCLD. */
2617 FD_ZERO (&Available
); /* Cannot depend on values returned */
2623 error ("select error: %s", emacs_strerror (xerrno
));
2625 #if defined(sun) && !defined(USG5_4)
2626 else if (nfds
> 0 && keyboard_bit_set (&Available
)
2628 /* System sometimes fails to deliver SIGIO.
2630 David J. Mackenzie says that Emacs doesn't compile under
2631 Solaris if this code is enabled, thus the USG5_4 in the CPP
2632 conditional. "I haven't noticed any ill effects so far.
2633 If you find a Solaris expert somewhere, they might know
2635 kill (getpid (), SIGIO
);
2638 #if 0 /* When polling is used, interrupt_input is 0,
2639 so get_input_pending should read the input.
2640 So this should not be needed. */
2641 /* If we are using polling for input,
2642 and we see input available, make it get read now.
2643 Otherwise it might not actually get read for a second.
2644 And on hpux, since we turn off polling in wait_reading_process_input,
2645 it might never get read at all if we don't spend much time
2646 outside of wait_reading_process_input. */
2647 if (XINT (read_kbd
) && interrupt_input
2648 && keyboard_bit_set (&Available
)
2649 && input_polling_used ())
2650 kill (getpid (), SIGALRM
);
2653 /* Check for keyboard input */
2654 /* If there is any, return immediately
2655 to give it higher priority than subprocesses */
2657 if (XINT (read_kbd
) != 0
2658 && detect_input_pending_run_timers (do_display
))
2660 swallow_events (do_display
);
2661 if (detect_input_pending_run_timers (do_display
))
2665 /* If there is unread keyboard input, also return. */
2666 if (XINT (read_kbd
) != 0
2667 && requeued_events_pending_p ())
2670 /* If we are not checking for keyboard input now,
2671 do process events (but don't run any timers).
2672 This is so that X events will be processed.
2673 Otherwise they may have to wait until polling takes place.
2674 That would causes delays in pasting selections, for example.
2676 (We used to do this only if wait_for_cell.) */
2677 if (XINT (read_kbd
) == 0 && detect_input_pending ())
2679 swallow_events (do_display
);
2680 #if 0 /* Exiting when read_kbd doesn't request that seems wrong, though. */
2681 if (detect_input_pending ())
2686 /* Exit now if the cell we're waiting for became non-nil. */
2687 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
2691 /* If we think we have keyboard input waiting, but didn't get SIGIO,
2692 go read it. This can happen with X on BSD after logging out.
2693 In that case, there really is no input and no SIGIO,
2694 but select says there is input. */
2696 if (XINT (read_kbd
) && interrupt_input
2697 && keyboard_bit_set (&Available
))
2698 kill (getpid (), SIGIO
);
2702 got_some_input
|= nfds
> 0;
2704 /* If checking input just got us a size-change event from X,
2705 obey it now if we should. */
2706 if (XINT (read_kbd
) || wait_for_cell
)
2707 do_pending_window_change (0);
2709 /* Check for data from a process. */
2710 /* Really FIRST_PROC_DESC should be 0 on Unix,
2711 but this is safer in the short run. */
2712 for (channel
= 0; channel
<= max_process_desc
; channel
++)
2714 if (FD_ISSET (channel
, &Available
)
2715 && FD_ISSET (channel
, &non_keyboard_wait_mask
))
2719 /* If waiting for this channel, arrange to return as
2720 soon as no more input to be processed. No more
2722 if (wait_channel
== channel
)
2728 proc
= chan_process
[channel
];
2732 /* Read data from the process, starting with our
2733 buffered-ahead character if we have one. */
2735 nread
= read_process_output (proc
, channel
);
2738 /* Since read_process_output can run a filter,
2739 which can call accept-process-output,
2740 don't try to read from any other processes
2741 before doing the select again. */
2742 FD_ZERO (&Available
);
2745 redisplay_preserve_echo_area (12);
2748 else if (nread
== -1 && errno
== EWOULDBLOCK
)
2751 /* ISC 4.1 defines both EWOULDBLOCK and O_NONBLOCK,
2752 and Emacs uses O_NONBLOCK, so what we get is EAGAIN. */
2754 else if (nread
== -1 && errno
== EAGAIN
)
2758 else if (nread
== -1 && errno
== EAGAIN
)
2760 /* Note that we cannot distinguish between no input
2761 available now and a closed pipe.
2762 With luck, a closed pipe will be accompanied by
2763 subprocess termination and SIGCHLD. */
2764 else if (nread
== 0 && !NETCONN_P (proc
))
2766 #endif /* O_NDELAY */
2767 #endif /* O_NONBLOCK */
2769 /* On some OSs with ptys, when the process on one end of
2770 a pty exits, the other end gets an error reading with
2771 errno = EIO instead of getting an EOF (0 bytes read).
2772 Therefore, if we get an error reading and errno =
2773 EIO, just continue, because the child process has
2774 exited and should clean itself up soon (e.g. when we
2777 However, it has been known to happen that the SIGCHLD
2778 got lost. So raise the signl again just in case.
2780 else if (nread
== -1 && errno
== EIO
)
2781 kill (getpid (), SIGCHLD
);
2782 #endif /* HAVE_PTYS */
2783 /* If we can detect process termination, don't consider the process
2784 gone just because its pipe is closed. */
2786 else if (nread
== 0 && !NETCONN_P (proc
))
2791 /* Preserve status of processes already terminated. */
2792 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
2793 deactivate_process (proc
);
2794 if (!NILP (XPROCESS (proc
)->raw_status_low
))
2795 update_status (XPROCESS (proc
));
2796 if (EQ (XPROCESS (proc
)->status
, Qrun
))
2797 XPROCESS (proc
)->status
2798 = Fcons (Qexit
, Fcons (make_number (256), Qnil
));
2801 } /* end for each file descriptor */
2802 } /* end while exit conditions not met */
2804 waiting_for_user_input_p
= 0;
2806 /* If calling from keyboard input, do not quit
2807 since we want to return C-g as an input character.
2808 Otherwise, do pending quit if requested. */
2809 if (XINT (read_kbd
) >= 0)
2811 /* Prevent input_pending from remaining set if we quit. */
2812 clear_input_pending ();
2816 /* AlainF 5-Jul-1996
2817 HP-UX 10.10 seems to have problems with signals coming in
2818 Causes "poll: interrupted system call" messages when Emacs is run
2820 Turn periodic alarms back on */
2824 return got_some_input
;
2827 /* Given a list (FUNCTION ARGS...), apply FUNCTION to the ARGS. */
2830 read_process_output_call (fun_and_args
)
2831 Lisp_Object fun_and_args
;
2833 return apply1 (XCAR (fun_and_args
), XCDR (fun_and_args
));
2837 read_process_output_error_handler (error
)
2840 cmd_error_internal (error
, "error in process filter: ");
2842 update_echo_area ();
2843 Fsleep_for (make_number (2), Qnil
);
2847 /* Read pending output from the process channel,
2848 starting with our buffered-ahead character if we have one.
2849 Yield number of decoded characters read.
2851 This function reads at most 1024 characters.
2852 If you want to read all available subprocess output,
2853 you must call it repeatedly until it returns zero.
2855 The characters read are decoded according to PROC's coding-system
2859 read_process_output (proc
, channel
)
2861 register int channel
;
2863 register int nchars
, nbytes
;
2865 register Lisp_Object outstream
;
2866 register struct buffer
*old
= current_buffer
;
2867 register struct Lisp_Process
*p
= XPROCESS (proc
);
2868 register int opoint
;
2869 struct coding_system
*coding
= proc_decode_coding_system
[channel
];
2870 int carryover
= XINT (p
->decoding_carryover
);
2873 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
2875 vs
= get_vms_process_pointer (p
->pid
);
2879 return (0); /* Really weird if it does this */
2880 if (!(vs
->iosb
[0] & 1))
2881 return -1; /* I/O error */
2884 error ("Could not get VMS process pointer");
2885 chars
= vs
->inputBuffer
;
2886 nbytes
= clean_vms_buffer (chars
, vs
->iosb
[1]);
2889 start_vms_process_read (vs
); /* Crank up the next read on the process */
2890 return 1; /* Nothing worth printing, say we got 1 */
2894 /* The data carried over in the previous decoding (which are at
2895 the tail of decoding buffer) should be prepended to the new
2896 data read to decode all together. */
2897 chars
= (char *) alloca (nbytes
+ carryover
);
2898 bcopy (XSTRING (p
->decoding_buf
)->data
, buf
, carryover
);
2899 bcopy (vs
->inputBuffer
, chars
+ carryover
, nbytes
);
2902 chars
= (char *) alloca (carryover
+ 1024);
2904 /* See the comment above. */
2905 bcopy (XSTRING (p
->decoding_buf
)->data
, chars
, carryover
);
2907 if (proc_buffered_char
[channel
] < 0)
2908 nbytes
= emacs_read (channel
, chars
+ carryover
, 1024 - carryover
);
2911 chars
[carryover
] = proc_buffered_char
[channel
];
2912 proc_buffered_char
[channel
] = -1;
2913 nbytes
= emacs_read (channel
, chars
+ carryover
+ 1, 1023 - carryover
);
2917 nbytes
= nbytes
+ 1;
2919 #endif /* not VMS */
2921 XSETINT (p
->decoding_carryover
, 0);
2923 /* At this point, NBYTES holds number of bytes just received
2924 (including the one in proc_buffered_char[channel]). */
2927 if (nbytes
< 0 || coding
->mode
& CODING_MODE_LAST_BLOCK
)
2929 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
2932 /* Now set NBYTES how many bytes we must decode. */
2933 nbytes
+= carryover
;
2935 /* Read and dispose of the process output. */
2936 outstream
= p
->filter
;
2937 if (!NILP (outstream
))
2939 /* We inhibit quit here instead of just catching it so that
2940 hitting ^G when a filter happens to be running won't screw
2942 int count
= specpdl_ptr
- specpdl
;
2943 Lisp_Object odeactivate
;
2944 Lisp_Object obuffer
, okeymap
;
2946 int outer_running_asynch_code
= running_asynch_code
;
2947 int waiting
= waiting_for_user_input_p
;
2949 /* No need to gcpro these, because all we do with them later
2950 is test them for EQness, and none of them should be a string. */
2951 odeactivate
= Vdeactivate_mark
;
2952 XSETBUFFER (obuffer
, current_buffer
);
2953 okeymap
= current_buffer
->keymap
;
2955 specbind (Qinhibit_quit
, Qt
);
2956 specbind (Qlast_nonmenu_event
, Qt
);
2958 /* In case we get recursively called,
2959 and we already saved the match data nonrecursively,
2960 save the same match data in safely recursive fashion. */
2961 if (outer_running_asynch_code
)
2964 /* Don't clobber the CURRENT match data, either! */
2965 tem
= Fmatch_data (Qnil
, Qnil
);
2966 restore_match_data ();
2967 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
2968 Fset_match_data (tem
);
2971 /* For speed, if a search happens within this code,
2972 save the match data in a special nonrecursive fashion. */
2973 running_asynch_code
= 1;
2975 text
= decode_coding_string (make_unibyte_string (chars
, nbytes
),
2977 if (NILP (buffer_defaults
.enable_multibyte_characters
))
2978 /* We had better return unibyte string. */
2979 text
= string_make_unibyte (text
);
2981 Vlast_coding_system_used
= coding
->symbol
;
2982 /* A new coding system might be found. */
2983 if (!EQ (p
->decode_coding_system
, coding
->symbol
))
2985 p
->decode_coding_system
= coding
->symbol
;
2987 /* Don't call setup_coding_system for
2988 proc_decode_coding_system[channel] here. It is done in
2989 detect_coding called via decode_coding above. */
2991 /* If a coding system for encoding is not yet decided, we set
2992 it as the same as coding-system for decoding.
2994 But, before doing that we must check if
2995 proc_encode_coding_system[p->outfd] surely points to a
2996 valid memory because p->outfd will be changed once EOF is
2997 sent to the process. */
2998 if (NILP (p
->encode_coding_system
)
2999 && proc_encode_coding_system
[XINT (p
->outfd
)])
3001 p
->encode_coding_system
= coding
->symbol
;
3002 setup_coding_system (coding
->symbol
,
3003 proc_encode_coding_system
[XINT (p
->outfd
)]);
3007 carryover
= nbytes
- coding
->consumed
;
3008 bcopy (chars
+ coding
->consumed
, XSTRING (p
->decoding_buf
)->data
,
3010 XSETINT (p
->decoding_carryover
, carryover
);
3011 nbytes
= STRING_BYTES (XSTRING (text
));
3012 nchars
= XSTRING (text
)->size
;
3014 internal_condition_case_1 (read_process_output_call
,
3016 Fcons (proc
, Fcons (text
, Qnil
))),
3017 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
3018 read_process_output_error_handler
);
3020 /* If we saved the match data nonrecursively, restore it now. */
3021 restore_match_data ();
3022 running_asynch_code
= outer_running_asynch_code
;
3024 /* Handling the process output should not deactivate the mark. */
3025 Vdeactivate_mark
= odeactivate
;
3027 /* Restore waiting_for_user_input_p as it was
3028 when we were called, in case the filter clobbered it. */
3029 waiting_for_user_input_p
= waiting
;
3031 #if 0 /* Call record_asynch_buffer_change unconditionally,
3032 because we might have changed minor modes or other things
3033 that affect key bindings. */
3034 if (! EQ (Fcurrent_buffer (), obuffer
)
3035 || ! EQ (current_buffer
->keymap
, okeymap
))
3037 /* But do it only if the caller is actually going to read events.
3038 Otherwise there's no need to make him wake up, and it could
3039 cause trouble (for example it would make Fsit_for return). */
3040 if (waiting_for_user_input_p
== -1)
3041 record_asynch_buffer_change ();
3044 start_vms_process_read (vs
);
3046 unbind_to (count
, Qnil
);
3050 /* If no filter, write into buffer if it isn't dead. */
3051 if (!NILP (p
->buffer
) && !NILP (XBUFFER (p
->buffer
)->name
))
3053 Lisp_Object old_read_only
;
3054 int old_begv
, old_zv
;
3055 int old_begv_byte
, old_zv_byte
;
3056 Lisp_Object odeactivate
;
3057 int before
, before_byte
;
3062 odeactivate
= Vdeactivate_mark
;
3064 Fset_buffer (p
->buffer
);
3066 opoint_byte
= PT_BYTE
;
3067 old_read_only
= current_buffer
->read_only
;
3070 old_begv_byte
= BEGV_BYTE
;
3071 old_zv_byte
= ZV_BYTE
;
3073 current_buffer
->read_only
= Qnil
;
3075 /* Insert new output into buffer
3076 at the current end-of-output marker,
3077 thus preserving logical ordering of input and output. */
3078 if (XMARKER (p
->mark
)->buffer
)
3079 SET_PT_BOTH (clip_to_bounds (BEGV
, marker_position (p
->mark
), ZV
),
3080 clip_to_bounds (BEGV_BYTE
, marker_byte_position (p
->mark
),
3083 SET_PT_BOTH (ZV
, ZV_BYTE
);
3085 before_byte
= PT_BYTE
;
3087 /* If the output marker is outside of the visible region, save
3088 the restriction and widen. */
3089 if (! (BEGV
<= PT
&& PT
<= ZV
))
3092 text
= decode_coding_string (make_unibyte_string (chars
, nbytes
),
3094 Vlast_coding_system_used
= coding
->symbol
;
3095 /* A new coding system might be found. See the comment in the
3096 similar code in the previous `if' block. */
3097 if (!EQ (p
->decode_coding_system
, coding
->symbol
))
3099 p
->decode_coding_system
= coding
->symbol
;
3100 if (NILP (p
->encode_coding_system
)
3101 && proc_encode_coding_system
[XINT (p
->outfd
)])
3103 p
->encode_coding_system
= coding
->symbol
;
3104 setup_coding_system (coding
->symbol
,
3105 proc_encode_coding_system
[XINT (p
->outfd
)]);
3108 carryover
= nbytes
- coding
->consumed
;
3109 bcopy (chars
+ coding
->consumed
, XSTRING (p
->decoding_buf
)->data
,
3111 XSETINT (p
->decoding_carryover
, carryover
);
3112 /* Adjust the multibyteness of TEXT to that of the buffer. */
3113 if (NILP (current_buffer
->enable_multibyte_characters
)
3114 != ! STRING_MULTIBYTE (text
))
3115 text
= (STRING_MULTIBYTE (text
)
3116 ? Fstring_as_unibyte (text
)
3117 : Fstring_as_multibyte (text
));
3118 nbytes
= STRING_BYTES (XSTRING (text
));
3119 nchars
= XSTRING (text
)->size
;
3120 /* Insert before markers in case we are inserting where
3121 the buffer's mark is, and the user's next command is Meta-y. */
3122 insert_from_string_before_markers (text
, 0, 0, nchars
, nbytes
, 0);
3123 signal_after_change (before
, 0, PT
- before
);
3124 update_compositions (before
, PT
, CHECK_BORDER
);
3126 /* Make sure the process marker's position is valid when the
3127 process buffer is changed in the signal_after_change above.
3128 W3 is known to do that. */
3129 if (BUFFERP (p
->buffer
)
3130 && (b
= XBUFFER (p
->buffer
), b
!= current_buffer
))
3131 set_marker_both (p
->mark
, p
->buffer
, BUF_PT (b
), BUF_PT_BYTE (b
));
3133 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
3135 update_mode_lines
++;
3137 /* Make sure opoint and the old restrictions
3138 float ahead of any new text just as point would. */
3139 if (opoint
>= before
)
3141 opoint
+= PT
- before
;
3142 opoint_byte
+= PT_BYTE
- before_byte
;
3144 if (old_begv
> before
)
3146 old_begv
+= PT
- before
;
3147 old_begv_byte
+= PT_BYTE
- before_byte
;
3149 if (old_zv
>= before
)
3151 old_zv
+= PT
- before
;
3152 old_zv_byte
+= PT_BYTE
- before_byte
;
3155 /* If the restriction isn't what it should be, set it. */
3156 if (old_begv
!= BEGV
|| old_zv
!= ZV
)
3157 Fnarrow_to_region (make_number (old_begv
), make_number (old_zv
));
3159 /* Handling the process output should not deactivate the mark. */
3160 Vdeactivate_mark
= odeactivate
;
3162 current_buffer
->read_only
= old_read_only
;
3163 SET_PT_BOTH (opoint
, opoint_byte
);
3164 set_buffer_internal (old
);
3167 start_vms_process_read (vs
);
3172 DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p
, Swaiting_for_user_input_p
,
3174 "Returns non-nil if emacs is waiting for input from the user.\n\
3175 This is intended for use by asynchronous process output filters and sentinels.")
3178 return (waiting_for_user_input_p
? Qt
: Qnil
);
3181 /* Sending data to subprocess */
3183 jmp_buf send_process_frame
;
3184 Lisp_Object process_sent_to
;
3187 send_process_trap ()
3193 longjmp (send_process_frame
, 1);
3196 /* Send some data to process PROC.
3197 BUF is the beginning of the data; LEN is the number of characters.
3198 OBJECT is the Lisp object that the data comes from. If OBJECT is
3199 nil or t, it means that the data comes from C string.
3201 If OBJECT is not nil, the data is encoded by PROC's coding-system
3202 for encoding before it is sent.
3204 This function can evaluate Lisp code and can garbage collect. */
3207 send_process (proc
, buf
, len
, object
)
3208 volatile Lisp_Object proc
;
3209 unsigned char *volatile buf
;
3211 volatile Lisp_Object object
;
3213 /* Use volatile to protect variables from being clobbered by longjmp. */
3215 struct coding_system
*coding
;
3216 struct gcpro gcpro1
;
3221 struct Lisp_Process
*p
= XPROCESS (proc
);
3222 VMS_PROC_STUFF
*vs
, *get_vms_process_pointer();
3225 if (! NILP (XPROCESS (proc
)->raw_status_low
))
3226 update_status (XPROCESS (proc
));
3227 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
3228 error ("Process %s not running",
3229 XSTRING (XPROCESS (proc
)->name
)->data
);
3230 if (XINT (XPROCESS (proc
)->outfd
) < 0)
3231 error ("Output file descriptor of %s is closed",
3232 XSTRING (XPROCESS (proc
)->name
)->data
);
3234 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3235 Vlast_coding_system_used
= coding
->symbol
;
3237 if ((STRINGP (object
) && STRING_MULTIBYTE (object
))
3238 || (BUFFERP (object
)
3239 && !NILP (XBUFFER (object
)->enable_multibyte_characters
))
3242 coding
->src_multibyte
= 1;
3243 if (!EQ (coding
->symbol
, XPROCESS (proc
)->encode_coding_system
))
3244 /* The coding system for encoding was changed to raw-text
3245 because we sent a unibyte text previously. Now we are
3246 sending a multibyte text, thus we must encode it by the
3247 original coding system specified for the current
3249 setup_coding_system (XPROCESS (proc
)->encode_coding_system
,
3254 /* For sending a unibyte text, character code conversion should
3255 not take place but EOL conversion should. So, setup raw-text
3256 or one of the subsidiary if we have not yet done it. */
3257 if (coding
->type
!= coding_type_raw_text
)
3259 if (CODING_REQUIRE_FLUSHING (coding
))
3261 /* But, before changing the coding, we must flush out data. */
3262 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
3263 send_process (proc
, "", 0, Qt
);
3265 coding
->src_multibyte
= 0;
3266 setup_raw_text_coding_system (coding
);
3269 coding
->dst_multibyte
= 0;
3271 if (CODING_REQUIRE_ENCODING (coding
))
3273 int require
= encoding_buffer_size (coding
, len
);
3274 int from_byte
= -1, from
= -1, to
= -1;
3275 unsigned char *temp_buf
= NULL
;
3277 if (BUFFERP (object
))
3279 from_byte
= BUF_PTR_BYTE_POS (XBUFFER (object
), buf
);
3280 from
= buf_bytepos_to_charpos (XBUFFER (object
), from_byte
);
3281 to
= buf_bytepos_to_charpos (XBUFFER (object
), from_byte
+ len
);
3283 else if (STRINGP (object
))
3285 from_byte
= buf
- XSTRING (object
)->data
;
3286 from
= string_byte_to_char (object
, from_byte
);
3287 to
= string_byte_to_char (object
, from_byte
+ len
);
3290 if (from_byte
>= 0 && coding
->composing
!= COMPOSITION_DISABLED
)
3291 coding_save_composition (coding
, from
, to
, object
);
3293 if (STRING_BYTES (XSTRING (XPROCESS (proc
)->encoding_buf
)) < require
)
3294 XPROCESS (proc
)->encoding_buf
= make_uninit_string (require
);
3297 buf
= (BUFFERP (object
)
3298 ? BUF_BYTE_ADDRESS (XBUFFER (object
), from_byte
)
3299 : XSTRING (object
)->data
+ from_byte
);
3301 object
= XPROCESS (proc
)->encoding_buf
;
3302 encode_coding (coding
, (char *) buf
, XSTRING (object
)->data
,
3303 len
, STRING_BYTES (XSTRING (object
)));
3304 len
= coding
->produced
;
3305 buf
= XSTRING (object
)->data
;
3311 vs
= get_vms_process_pointer (p
->pid
);
3313 error ("Could not find this process: %x", p
->pid
);
3314 else if (write_to_vms_process (vs
, buf
, len
))
3318 if (pty_max_bytes
== 0)
3320 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
3321 pty_max_bytes
= fpathconf (XFASTINT (XPROCESS (proc
)->outfd
),
3323 if (pty_max_bytes
< 0)
3324 pty_max_bytes
= 250;
3326 pty_max_bytes
= 250;
3328 /* Deduct one, to leave space for the eof. */
3332 /* 2000-09-21: Emacs 20.7, sparc-sun-solaris-2.6, GCC 2.95.2,
3333 CFLAGS="-g -O": The value of the parameter `proc' is clobbered
3334 when returning with longjmp despite being declared volatile. */
3335 if (!setjmp (send_process_frame
))
3337 process_sent_to
= proc
;
3341 SIGTYPE (*old_sigpipe
)();
3343 /* Decide how much data we can send in one batch.
3344 Long lines need to be split into multiple batches. */
3345 if (!NILP (XPROCESS (proc
)->pty_flag
))
3347 /* Starting this at zero is always correct when not the first iteration
3348 because the previous iteration ended by sending C-d.
3349 It may not be correct for the first iteration
3350 if a partial line was sent in a separate send_process call.
3351 If that proves worth handling, we need to save linepos
3352 in the process object. */
3354 unsigned char *ptr
= (unsigned char *) buf
;
3355 unsigned char *end
= (unsigned char *) buf
+ len
;
3357 /* Scan through this text for a line that is too long. */
3358 while (ptr
!= end
&& linepos
< pty_max_bytes
)
3366 /* If we found one, break the line there
3367 and put in a C-d to force the buffer through. */
3371 /* Send this batch, using one or more write calls. */
3374 old_sigpipe
= (SIGTYPE (*) ()) signal (SIGPIPE
, send_process_trap
);
3375 rv
= emacs_write (XINT (XPROCESS (proc
)->outfd
),
3376 (char *) buf
, this);
3377 signal (SIGPIPE
, old_sigpipe
);
3383 || errno
== EWOULDBLOCK
3389 /* Buffer is full. Wait, accepting input;
3390 that may allow the program
3391 to finish doing output and read more. */
3396 #ifdef BROKEN_PTY_READ_AFTER_EAGAIN
3397 /* A gross hack to work around a bug in FreeBSD.
3398 In the following sequence, read(2) returns
3402 write(2) 954 bytes, get EAGAIN
3403 read(2) 1024 bytes in process_read_output
3404 read(2) 11 bytes in process_read_output
3406 That is, read(2) returns more bytes than have
3407 ever been written successfully. The 1033 bytes
3408 read are the 1022 bytes written successfully
3409 after processing (for example with CRs added if
3410 the terminal is set up that way which it is
3411 here). The same bytes will be seen again in a
3412 later read(2), without the CRs. */
3414 if (errno
== EAGAIN
)
3417 ioctl (XINT (XPROCESS (proc
)->outfd
), TIOCFLUSH
,
3420 #endif /* BROKEN_PTY_READ_AFTER_EAGAIN */
3422 /* Running filters might relocate buffers or strings.
3423 Arrange to relocate BUF. */
3424 if (BUFFERP (object
))
3425 offset
= BUF_PTR_BYTE_POS (XBUFFER (object
), buf
);
3426 else if (STRINGP (object
))
3427 offset
= buf
- XSTRING (object
)->data
;
3429 XSETFASTINT (zero
, 0);
3430 #ifdef EMACS_HAS_USECS
3431 wait_reading_process_input (0, 20000, zero
, 0);
3433 wait_reading_process_input (1, 0, zero
, 0);
3436 if (BUFFERP (object
))
3437 buf
= BUF_BYTE_ADDRESS (XBUFFER (object
), offset
);
3438 else if (STRINGP (object
))
3439 buf
= offset
+ XSTRING (object
)->data
;
3444 /* This is a real error. */
3445 report_file_error ("writing to process", Fcons (proc
, Qnil
));
3452 /* If we sent just part of the string, put in an EOF
3453 to force it through, before we send the rest. */
3455 Fprocess_send_eof (proc
);
3458 #endif /* not VMS */
3462 proc
= process_sent_to
;
3464 XPROCESS (proc
)->raw_status_low
= Qnil
;
3465 XPROCESS (proc
)->raw_status_high
= Qnil
;
3466 XPROCESS (proc
)->status
= Fcons (Qexit
, Fcons (make_number (256), Qnil
));
3467 XSETINT (XPROCESS (proc
)->tick
, ++process_tick
);
3468 deactivate_process (proc
);
3470 error ("Error writing to process %s; closed it",
3471 XSTRING (XPROCESS (proc
)->name
)->data
);
3473 error ("SIGPIPE raised on process %s; closed it",
3474 XSTRING (XPROCESS (proc
)->name
)->data
);
3481 DEFUN ("process-send-region", Fprocess_send_region
, Sprocess_send_region
,
3483 "Send current contents of region as input to PROCESS.\n\
3484 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3485 nil, indicating the current buffer's process.\n\
3486 Called from program, takes three arguments, PROCESS, START and END.\n\
3487 If the region is more than 500 characters long,\n\
3488 it is sent in several bunches. This may happen even for shorter regions.\n\
3489 Output from processes can arrive in between bunches.")
3490 (process
, start
, end
)
3491 Lisp_Object process
, start
, end
;
3496 proc
= get_process (process
);
3497 validate_region (&start
, &end
);
3499 if (XINT (start
) < GPT
&& XINT (end
) > GPT
)
3500 move_gap (XINT (start
));
3502 start1
= CHAR_TO_BYTE (XINT (start
));
3503 end1
= CHAR_TO_BYTE (XINT (end
));
3504 send_process (proc
, BYTE_POS_ADDR (start1
), end1
- start1
,
3505 Fcurrent_buffer ());
3510 DEFUN ("process-send-string", Fprocess_send_string
, Sprocess_send_string
,
3512 "Send PROCESS the contents of STRING as input.\n\
3513 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3514 nil, indicating the current buffer's process.\n\
3515 If STRING is more than 500 characters long,\n\
3516 it is sent in several bunches. This may happen even for shorter strings.\n\
3517 Output from processes can arrive in between bunches.")
3519 Lisp_Object process
, string
;
3522 CHECK_STRING (string
, 1);
3523 proc
= get_process (process
);
3524 send_process (proc
, XSTRING (string
)->data
,
3525 STRING_BYTES (XSTRING (string
)), string
);
3529 DEFUN ("process-running-child-p", Fprocess_running_child_p
,
3530 Sprocess_running_child_p
, 0, 1, 0,
3531 "Return t if PROCESS has given the terminal to a child.\n\
3532 If the operating system does not make it possible to find out,\n\
3533 return t unconditionally.")
3535 Lisp_Object process
;
3537 /* Initialize in case ioctl doesn't exist or gives an error,
3538 in a way that will cause returning t. */
3541 struct Lisp_Process
*p
;
3543 proc
= get_process (process
);
3544 p
= XPROCESS (proc
);
3546 if (!EQ (p
->childp
, Qt
))
3547 error ("Process %s is not a subprocess",
3548 XSTRING (p
->name
)->data
);
3549 if (XINT (p
->infd
) < 0)
3550 error ("Process %s is not active",
3551 XSTRING (p
->name
)->data
);
3554 if (!NILP (p
->subtty
))
3555 ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3557 ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3558 #endif /* defined (TIOCGPGRP ) */
3560 if (gid
== XFASTINT (p
->pid
))
3565 /* send a signal number SIGNO to PROCESS.
3566 If CURRENT_GROUP is t, that means send to the process group
3567 that currently owns the terminal being used to communicate with PROCESS.
3568 This is used for various commands in shell mode.
3569 If CURRENT_GROUP is lambda, that means send to the process group
3570 that currently owns the terminal, but only if it is NOT the shell itself.
3572 If NOMSG is zero, insert signal-announcements into process's buffers
3575 If we can, we try to signal PROCESS by sending control characters
3576 down the pty. This allows us to signal inferiors who have changed
3577 their uid, for which killpg would return an EPERM error. */
3580 process_send_signal (process
, signo
, current_group
, nomsg
)
3581 Lisp_Object process
;
3583 Lisp_Object current_group
;
3587 register struct Lisp_Process
*p
;
3591 proc
= get_process (process
);
3592 p
= XPROCESS (proc
);
3594 if (!EQ (p
->childp
, Qt
))
3595 error ("Process %s is not a subprocess",
3596 XSTRING (p
->name
)->data
);
3597 if (XINT (p
->infd
) < 0)
3598 error ("Process %s is not active",
3599 XSTRING (p
->name
)->data
);
3601 if (NILP (p
->pty_flag
))
3602 current_group
= Qnil
;
3604 /* If we are using pgrps, get a pgrp number and make it negative. */
3605 if (!NILP (current_group
))
3607 #ifdef SIGNALS_VIA_CHARACTERS
3608 /* If possible, send signals to the entire pgrp
3609 by sending an input character to it. */
3611 /* TERMIOS is the latest and bestest, and seems most likely to
3612 work. If the system has it, use it. */
3619 tcgetattr (XINT (p
->infd
), &t
);
3620 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3624 tcgetattr (XINT (p
->infd
), &t
);
3625 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3629 tcgetattr (XINT (p
->infd
), &t
);
3630 #if defined (VSWTCH) && !defined (PREFER_VSUSP)
3631 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3633 send_process (proc
, &t
.c_cc
[VSUSP
], 1, Qnil
);
3638 #else /* ! HAVE_TERMIOS */
3640 /* On Berkeley descendants, the following IOCTL's retrieve the
3641 current control characters. */
3642 #if defined (TIOCGLTC) && defined (TIOCGETC)
3650 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3651 send_process (proc
, &c
.t_intrc
, 1, Qnil
);
3654 ioctl (XINT (p
->infd
), TIOCGETC
, &c
);
3655 send_process (proc
, &c
.t_quitc
, 1, Qnil
);
3659 ioctl (XINT (p
->infd
), TIOCGLTC
, &lc
);
3660 send_process (proc
, &lc
.t_suspc
, 1, Qnil
);
3662 #endif /* ! defined (SIGTSTP) */
3665 #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3667 /* On SYSV descendants, the TCGETA ioctl retrieves the current control
3674 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3675 send_process (proc
, &t
.c_cc
[VINTR
], 1, Qnil
);
3678 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3679 send_process (proc
, &t
.c_cc
[VQUIT
], 1, Qnil
);
3683 ioctl (XINT (p
->infd
), TCGETA
, &t
);
3684 send_process (proc
, &t
.c_cc
[VSWTCH
], 1, Qnil
);
3686 #endif /* ! defined (SIGTSTP) */
3688 #else /* ! defined (TCGETA) */
3689 Your configuration files are messed up
.
3690 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
3691 you'd better be using one of the alternatives above! */
3692 #endif /* ! defined (TCGETA) */
3693 #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
3694 #endif /* ! defined HAVE_TERMIOS */
3695 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
3698 /* Get the pgrp using the tty itself, if we have that.
3699 Otherwise, use the pty to get the pgrp.
3700 On pfa systems, saka@pfu.fujitsu.co.JP writes:
3701 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
3702 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
3703 His patch indicates that if TIOCGPGRP returns an error, then
3704 we should just assume that p->pid is also the process group id. */
3708 if (!NILP (p
->subtty
))
3709 err
= ioctl (XFASTINT (p
->subtty
), TIOCGPGRP
, &gid
);
3711 err
= ioctl (XINT (p
->infd
), TIOCGPGRP
, &gid
);
3715 gid
= - XFASTINT (p
->pid
);
3716 #endif /* ! defined (pfa) */
3722 #else /* ! defined (TIOCGPGRP ) */
3723 /* Can't select pgrps on this system, so we know that
3724 the child itself heads the pgrp. */
3725 gid
= - XFASTINT (p
->pid
);
3726 #endif /* ! defined (TIOCGPGRP ) */
3728 /* If current_group is lambda, and the shell owns the terminal,
3729 don't send any signal. */
3730 if (EQ (current_group
, Qlambda
) && gid
== - XFASTINT (p
->pid
))
3734 gid
= - XFASTINT (p
->pid
);
3740 p
->raw_status_low
= Qnil
;
3741 p
->raw_status_high
= Qnil
;
3743 XSETINT (p
->tick
, ++process_tick
);
3747 #endif /* ! defined (SIGCONT) */
3750 send_process (proc
, "\003", 1, Qnil
); /* ^C */
3755 send_process (proc
, "\031", 1, Qnil
); /* ^Y */
3760 sys$
forcex (&(XFASTINT (p
->pid
)), 0, 1);
3763 flush_pending_output (XINT (p
->infd
));
3767 /* If we don't have process groups, send the signal to the immediate
3768 subprocess. That isn't really right, but it's better than any
3769 obvious alternative. */
3772 kill (XFASTINT (p
->pid
), signo
);
3776 /* gid may be a pid, or minus a pgrp's number */
3778 if (!NILP (current_group
))
3779 ioctl (XINT (p
->infd
), TIOCSIGSEND
, signo
);
3782 gid
= - XFASTINT (p
->pid
);
3785 #else /* ! defined (TIOCSIGSEND) */
3786 EMACS_KILLPG (-gid
, signo
);
3787 #endif /* ! defined (TIOCSIGSEND) */
3790 DEFUN ("interrupt-process", Finterrupt_process
, Sinterrupt_process
, 0, 2, 0,
3791 "Interrupt process PROCESS.\n\
3792 PROCESS may be a process, a buffer, or the name of a process or buffer.\n\
3793 nil or no arg means current buffer's process.\n\
3794 Second arg CURRENT-GROUP non-nil means send signal to\n\
3795 the current process-group of the process's controlling terminal\n\
3796 rather than to the process's own process group.\n\
3797 If the process is a shell, this means interrupt current subjob\n\
3798 rather than the shell.\n\
3800 If CURRENT-GROUP is `lambda', and if the shell owns the terminal,\n\
3801 don't send the signal.")
3802 (process
, current_group
)
3803 Lisp_Object process
, current_group
;
3805 process_send_signal (process
, SIGINT
, current_group
, 0);
3809 DEFUN ("kill-process", Fkill_process
, Skill_process
, 0, 2, 0,
3810 "Kill process PROCESS. May be process or name of one.\n\
3811 See function `interrupt-process' for more details on usage.")
3812 (process
, current_group
)
3813 Lisp_Object process
, current_group
;
3815 process_send_signal (process
, SIGKILL
, current_group
, 0);
3819 DEFUN ("quit-process", Fquit_process
, Squit_process
, 0, 2, 0,
3820 "Send QUIT signal to process PROCESS. May be process or name of one.\n\
3821 See function `interrupt-process' for more details on usage.")
3822 (process
, current_group
)
3823 Lisp_Object process
, current_group
;
3825 process_send_signal (process
, SIGQUIT
, current_group
, 0);
3829 DEFUN ("stop-process", Fstop_process
, Sstop_process
, 0, 2, 0,
3830 "Stop process PROCESS. May be process or name of one.\n\
3831 See function `interrupt-process' for more details on usage.")
3832 (process
, current_group
)
3833 Lisp_Object process
, current_group
;
3836 error ("no SIGTSTP support");
3838 process_send_signal (process
, SIGTSTP
, current_group
, 0);
3843 DEFUN ("continue-process", Fcontinue_process
, Scontinue_process
, 0, 2, 0,
3844 "Continue process PROCESS. May be process or name of one.\n\
3845 See function `interrupt-process' for more details on usage.")
3846 (process
, current_group
)
3847 Lisp_Object process
, current_group
;
3850 process_send_signal (process
, SIGCONT
, current_group
, 0);
3852 error ("no SIGCONT support");
3857 DEFUN ("signal-process", Fsignal_process
, Ssignal_process
,
3858 2, 2, "nProcess number: \nnSignal code: ",
3859 "Send the process with process id PID the signal with code SIGCODE.\n\
3860 PID must be an integer. The process need not be a child of this Emacs.\n\
3861 SIGCODE may be an integer, or a symbol whose name is a signal name.")
3863 Lisp_Object pid
, sigcode
;
3865 CHECK_NUMBER (pid
, 0);
3867 #define handle_signal(NAME, VALUE) \
3868 else if (!strcmp (name, NAME)) \
3869 XSETINT (sigcode, VALUE)
3871 if (INTEGERP (sigcode
))
3875 unsigned char *name
;
3877 CHECK_SYMBOL (sigcode
, 1);
3878 name
= XSYMBOL (sigcode
)->name
->data
;
3883 handle_signal ("SIGHUP", SIGHUP
);
3886 handle_signal ("SIGINT", SIGINT
);
3889 handle_signal ("SIGQUIT", SIGQUIT
);
3892 handle_signal ("SIGILL", SIGILL
);
3895 handle_signal ("SIGABRT", SIGABRT
);
3898 handle_signal ("SIGEMT", SIGEMT
);
3901 handle_signal ("SIGKILL", SIGKILL
);
3904 handle_signal ("SIGFPE", SIGFPE
);
3907 handle_signal ("SIGBUS", SIGBUS
);
3910 handle_signal ("SIGSEGV", SIGSEGV
);
3913 handle_signal ("SIGSYS", SIGSYS
);
3916 handle_signal ("SIGPIPE", SIGPIPE
);
3919 handle_signal ("SIGALRM", SIGALRM
);
3922 handle_signal ("SIGTERM", SIGTERM
);
3925 handle_signal ("SIGURG", SIGURG
);
3928 handle_signal ("SIGSTOP", SIGSTOP
);
3931 handle_signal ("SIGTSTP", SIGTSTP
);
3934 handle_signal ("SIGCONT", SIGCONT
);
3937 handle_signal ("SIGCHLD", SIGCHLD
);
3940 handle_signal ("SIGTTIN", SIGTTIN
);
3943 handle_signal ("SIGTTOU", SIGTTOU
);
3946 handle_signal ("SIGIO", SIGIO
);
3949 handle_signal ("SIGXCPU", SIGXCPU
);
3952 handle_signal ("SIGXFSZ", SIGXFSZ
);
3955 handle_signal ("SIGVTALRM", SIGVTALRM
);
3958 handle_signal ("SIGPROF", SIGPROF
);
3961 handle_signal ("SIGWINCH", SIGWINCH
);
3964 handle_signal ("SIGINFO", SIGINFO
);
3967 handle_signal ("SIGUSR1", SIGUSR1
);
3970 handle_signal ("SIGUSR2", SIGUSR2
);
3973 error ("Undefined signal name %s", name
);
3976 #undef handle_signal
3978 return make_number (kill (XINT (pid
), XINT (sigcode
)));
3981 DEFUN ("process-send-eof", Fprocess_send_eof
, Sprocess_send_eof
, 0, 1, 0,
3982 "Make PROCESS see end-of-file in its input.\n\
3983 EOF comes after any text already sent to it.\n\
3984 PROCESS may be a process, a buffer, the name of a process or buffer, or\n\
3985 nil, indicating the current buffer's process.\n\
3986 If PROCESS is a network connection, or is a process communicating\n\
3987 through a pipe (as opposed to a pty), then you cannot send any more\n\
3988 text to PROCESS after you call this function.")
3990 Lisp_Object process
;
3993 struct coding_system
*coding
;
3995 proc
= get_process (process
);
3996 coding
= proc_encode_coding_system
[XINT (XPROCESS (proc
)->outfd
)];
3998 /* Make sure the process is really alive. */
3999 if (! NILP (XPROCESS (proc
)->raw_status_low
))
4000 update_status (XPROCESS (proc
));
4001 if (! EQ (XPROCESS (proc
)->status
, Qrun
))
4002 error ("Process %s not running", XSTRING (XPROCESS (proc
)->name
)->data
);
4004 if (CODING_REQUIRE_FLUSHING (coding
))
4006 coding
->mode
|= CODING_MODE_LAST_BLOCK
;
4007 send_process (proc
, "", 0, Qnil
);
4011 send_process (proc
, "\032", 1, Qnil
); /* ^z */
4013 if (!NILP (XPROCESS (proc
)->pty_flag
))
4014 send_process (proc
, "\004", 1, Qnil
);
4017 int old_outfd
, new_outfd
;
4019 #ifdef HAVE_SHUTDOWN
4020 /* If this is a network connection, or socketpair is used
4021 for communication with the subprocess, call shutdown to cause EOF.
4022 (In some old system, shutdown to socketpair doesn't work.
4023 Then we just can't win.) */
4024 if (NILP (XPROCESS (proc
)->pid
)
4025 || XINT (XPROCESS (proc
)->outfd
) == XINT (XPROCESS (proc
)->infd
))
4026 shutdown (XINT (XPROCESS (proc
)->outfd
), 1);
4027 /* In case of socketpair, outfd == infd, so don't close it. */
4028 if (XINT (XPROCESS (proc
)->outfd
) != XINT (XPROCESS (proc
)->infd
))
4029 emacs_close (XINT (XPROCESS (proc
)->outfd
));
4030 #else /* not HAVE_SHUTDOWN */
4031 emacs_close (XINT (XPROCESS (proc
)->outfd
));
4032 #endif /* not HAVE_SHUTDOWN */
4033 new_outfd
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
4034 old_outfd
= XINT (XPROCESS (proc
)->outfd
);
4036 if (!proc_encode_coding_system
[new_outfd
])
4037 proc_encode_coding_system
[new_outfd
]
4038 = (struct coding_system
*) xmalloc (sizeof (struct coding_system
));
4039 bcopy (proc_encode_coding_system
[old_outfd
],
4040 proc_encode_coding_system
[new_outfd
],
4041 sizeof (struct coding_system
));
4042 bzero (proc_encode_coding_system
[old_outfd
],
4043 sizeof (struct coding_system
));
4045 XSETINT (XPROCESS (proc
)->outfd
, new_outfd
);
4051 /* Kill all processes associated with `buffer'.
4052 If `buffer' is nil, kill all processes */
4055 kill_buffer_processes (buffer
)
4058 Lisp_Object tail
, proc
;
4060 for (tail
= Vprocess_alist
; GC_CONSP (tail
); tail
= XCDR (tail
))
4062 proc
= XCDR (XCAR (tail
));
4063 if (GC_PROCESSP (proc
)
4064 && (NILP (buffer
) || EQ (XPROCESS (proc
)->buffer
, buffer
)))
4066 if (NETCONN_P (proc
))
4067 Fdelete_process (proc
);
4068 else if (XINT (XPROCESS (proc
)->infd
) >= 0)
4069 process_send_signal (proc
, SIGHUP
, Qnil
, 1);
4074 /* On receipt of a signal that a child status has changed,
4075 loop asking about children with changed statuses until
4076 the system says there are no more.
4077 All we do is change the status;
4078 we do not run sentinels or print notifications.
4079 That is saved for the next time keyboard input is done,
4080 in order to avoid timing errors. */
4082 /** WARNING: this can be called during garbage collection.
4083 Therefore, it must not be fooled by the presence of mark bits in
4086 /** USG WARNING: Although it is not obvious from the documentation
4087 in signal(2), on a USG system the SIGCLD handler MUST NOT call
4088 signal() before executing at least one wait(), otherwise the handler
4089 will be called again, resulting in an infinite loop. The relevant
4090 portion of the documentation reads "SIGCLD signals will be queued
4091 and the signal-catching function will be continually reentered until
4092 the queue is empty". Invoking signal() causes the kernel to reexamine
4093 the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */
4096 sigchld_handler (signo
)
4099 int old_errno
= errno
;
4101 register struct Lisp_Process
*p
;
4102 extern EMACS_TIME
*input_available_clear_time
;
4106 sigheld
|= sigbit (SIGCHLD
);
4118 #endif /* no WUNTRACED */
4119 /* Keep trying to get a status until we get a definitive result. */
4123 pid
= wait3 (&w
, WNOHANG
| WUNTRACED
, 0);
4125 while (pid
<= 0 && errno
== EINTR
);
4129 /* A real failure. We have done all our job, so return. */
4131 /* USG systems forget handlers when they are used;
4132 must reestablish each time */
4133 #if defined (USG) && !defined (POSIX_SIGNALS)
4134 signal (signo
, sigchld_handler
); /* WARNING - must come after wait3() */
4137 sigheld
&= ~sigbit (SIGCHLD
);
4145 #endif /* no WNOHANG */
4147 /* Find the process that signaled us, and record its status. */
4150 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCDR (tail
))
4152 proc
= XCDR (XCAR (tail
));
4153 p
= XPROCESS (proc
);
4154 if (EQ (p
->childp
, Qt
) && XFASTINT (p
->pid
) == pid
)
4159 /* Look for an asynchronous process whose pid hasn't been filled
4162 for (tail
= Vprocess_alist
; CONSP (tail
); tail
= XCDR (tail
))
4164 proc
= XCDR (XCAR (tail
));
4165 p
= XPROCESS (proc
);
4166 if (INTEGERP (p
->pid
) && XINT (p
->pid
) == -1)
4171 /* Change the status of the process that was found. */
4174 union { int i
; WAITTYPE wt
; } u
;
4175 int clear_desc_flag
= 0;
4177 XSETINT (p
->tick
, ++process_tick
);
4179 XSETINT (p
->raw_status_low
, u
.i
& 0xffff);
4180 XSETINT (p
->raw_status_high
, u
.i
>> 16);
4182 /* If process has terminated, stop waiting for its output. */
4183 if ((WIFSIGNALED (w
) || WIFEXITED (w
))
4184 && XINT (p
->infd
) >= 0)
4185 clear_desc_flag
= 1;
4187 /* We use clear_desc_flag to avoid a compiler bug in Microsoft C. */
4188 if (clear_desc_flag
)
4190 FD_CLR (XINT (p
->infd
), &input_wait_mask
);
4191 FD_CLR (XINT (p
->infd
), &non_keyboard_wait_mask
);
4194 /* Tell wait_reading_process_input that it needs to wake up and
4196 if (input_available_clear_time
)
4197 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4200 /* There was no asynchronous process found for that id. Check
4201 if we have a synchronous process. */
4204 synch_process_alive
= 0;
4206 /* Report the status of the synchronous process. */
4208 synch_process_retcode
= WRETCODE (w
);
4209 else if (WIFSIGNALED (w
))
4211 int code
= WTERMSIG (w
);
4214 synchronize_system_messages_locale ();
4215 signame
= strsignal (code
);
4218 signame
= "unknown";
4220 synch_process_death
= signame
;
4223 /* Tell wait_reading_process_input that it needs to wake up and
4225 if (input_available_clear_time
)
4226 EMACS_SET_SECS_USECS (*input_available_clear_time
, 0, 0);
4229 /* On some systems, we must return right away.
4230 If any more processes want to signal us, we will
4232 Otherwise (on systems that have WNOHANG), loop around
4233 to use up all the processes that have something to tell us. */
4234 #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) || defined (WINDOWSNT)
4235 #if defined (USG) && ! defined (POSIX_SIGNALS)
4236 signal (signo
, sigchld_handler
);
4240 #endif /* USG, but not HPUX with WNOHANG */
4246 exec_sentinel_unwind (data
)
4249 XPROCESS (XCAR (data
))->sentinel
= XCDR (data
);
4254 exec_sentinel_error_handler (error
)
4257 cmd_error_internal (error
, "error in process sentinel: ");
4259 update_echo_area ();
4260 Fsleep_for (make_number (2), Qnil
);
4265 exec_sentinel (proc
, reason
)
4266 Lisp_Object proc
, reason
;
4268 Lisp_Object sentinel
, obuffer
, odeactivate
, okeymap
;
4269 register struct Lisp_Process
*p
= XPROCESS (proc
);
4270 int count
= specpdl_ptr
- specpdl
;
4271 int outer_running_asynch_code
= running_asynch_code
;
4272 int waiting
= waiting_for_user_input_p
;
4274 /* No need to gcpro these, because all we do with them later
4275 is test them for EQness, and none of them should be a string. */
4276 odeactivate
= Vdeactivate_mark
;
4277 XSETBUFFER (obuffer
, current_buffer
);
4278 okeymap
= current_buffer
->keymap
;
4280 sentinel
= p
->sentinel
;
4281 if (NILP (sentinel
))
4284 /* Zilch the sentinel while it's running, to avoid recursive invocations;
4285 assure that it gets restored no matter how the sentinel exits. */
4287 record_unwind_protect (exec_sentinel_unwind
, Fcons (proc
, sentinel
));
4288 /* Inhibit quit so that random quits don't screw up a running filter. */
4289 specbind (Qinhibit_quit
, Qt
);
4290 specbind (Qlast_nonmenu_event
, Qt
);
4292 /* In case we get recursively called,
4293 and we already saved the match data nonrecursively,
4294 save the same match data in safely recursive fashion. */
4295 if (outer_running_asynch_code
)
4298 tem
= Fmatch_data (Qnil
, Qnil
);
4299 restore_match_data ();
4300 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
4301 Fset_match_data (tem
);
4304 /* For speed, if a search happens within this code,
4305 save the match data in a special nonrecursive fashion. */
4306 running_asynch_code
= 1;
4308 internal_condition_case_1 (read_process_output_call
,
4310 Fcons (proc
, Fcons (reason
, Qnil
))),
4311 !NILP (Vdebug_on_error
) ? Qnil
: Qerror
,
4312 exec_sentinel_error_handler
);
4314 /* If we saved the match data nonrecursively, restore it now. */
4315 restore_match_data ();
4316 running_asynch_code
= outer_running_asynch_code
;
4318 Vdeactivate_mark
= odeactivate
;
4320 /* Restore waiting_for_user_input_p as it was
4321 when we were called, in case the filter clobbered it. */
4322 waiting_for_user_input_p
= waiting
;
4325 if (! EQ (Fcurrent_buffer (), obuffer
)
4326 || ! EQ (current_buffer
->keymap
, okeymap
))
4328 /* But do it only if the caller is actually going to read events.
4329 Otherwise there's no need to make him wake up, and it could
4330 cause trouble (for example it would make Fsit_for return). */
4331 if (waiting_for_user_input_p
== -1)
4332 record_asynch_buffer_change ();
4334 unbind_to (count
, Qnil
);
4337 /* Report all recent events of a change in process status
4338 (either run the sentinel or output a message).
4339 This is done while Emacs is waiting for keyboard input. */
4344 register Lisp_Object proc
, buffer
;
4345 Lisp_Object tail
, msg
;
4346 struct gcpro gcpro1
, gcpro2
;
4350 /* We need to gcpro tail; if read_process_output calls a filter
4351 which deletes a process and removes the cons to which tail points
4352 from Vprocess_alist, and then causes a GC, tail is an unprotected
4356 /* Set this now, so that if new processes are created by sentinels
4357 that we run, we get called again to handle their status changes. */
4358 update_tick
= process_tick
;
4360 for (tail
= Vprocess_alist
; !NILP (tail
); tail
= Fcdr (tail
))
4363 register struct Lisp_Process
*p
;
4365 proc
= Fcdr (Fcar (tail
));
4366 p
= XPROCESS (proc
);
4368 if (XINT (p
->tick
) != XINT (p
->update_tick
))
4370 XSETINT (p
->update_tick
, XINT (p
->tick
));
4372 /* If process is still active, read any output that remains. */
4373 while (! EQ (p
->filter
, Qt
)
4374 && XINT (p
->infd
) >= 0
4375 && read_process_output (proc
, XINT (p
->infd
)) > 0);
4379 /* Get the text to use for the message. */
4380 if (!NILP (p
->raw_status_low
))
4382 msg
= status_message (p
->status
);
4384 /* If process is terminated, deactivate it or delete it. */
4386 if (CONSP (p
->status
))
4387 symbol
= XCAR (p
->status
);
4389 if (EQ (symbol
, Qsignal
) || EQ (symbol
, Qexit
)
4390 || EQ (symbol
, Qclosed
))
4392 if (delete_exited_processes
)
4393 remove_process (proc
);
4395 deactivate_process (proc
);
4398 /* The actions above may have further incremented p->tick.
4399 So set p->update_tick again
4400 so that an error in the sentinel will not cause
4401 this code to be run again. */
4402 XSETINT (p
->update_tick
, XINT (p
->tick
));
4403 /* Now output the message suitably. */
4404 if (!NILP (p
->sentinel
))
4405 exec_sentinel (proc
, msg
);
4406 /* Don't bother with a message in the buffer
4407 when a process becomes runnable. */
4408 else if (!EQ (symbol
, Qrun
) && !NILP (buffer
))
4410 Lisp_Object ro
, tem
;
4411 struct buffer
*old
= current_buffer
;
4412 int opoint
, opoint_byte
;
4413 int before
, before_byte
;
4415 ro
= XBUFFER (buffer
)->read_only
;
4417 /* Avoid error if buffer is deleted
4418 (probably that's why the process is dead, too) */
4419 if (NILP (XBUFFER (buffer
)->name
))
4421 Fset_buffer (buffer
);
4424 opoint_byte
= PT_BYTE
;
4425 /* Insert new output into buffer
4426 at the current end-of-output marker,
4427 thus preserving logical ordering of input and output. */
4428 if (XMARKER (p
->mark
)->buffer
)
4429 Fgoto_char (p
->mark
);
4431 SET_PT_BOTH (ZV
, ZV_BYTE
);
4434 before_byte
= PT_BYTE
;
4436 tem
= current_buffer
->read_only
;
4437 current_buffer
->read_only
= Qnil
;
4438 insert_string ("\nProcess ");
4439 Finsert (1, &p
->name
);
4440 insert_string (" ");
4442 current_buffer
->read_only
= tem
;
4443 set_marker_both (p
->mark
, p
->buffer
, PT
, PT_BYTE
);
4445 if (opoint
>= before
)
4446 SET_PT_BOTH (opoint
+ (PT
- before
),
4447 opoint_byte
+ (PT_BYTE
- before_byte
));
4449 SET_PT_BOTH (opoint
, opoint_byte
);
4451 set_buffer_internal (old
);
4456 update_mode_lines
++; /* in case buffers use %s in mode-line-format */
4457 redisplay_preserve_echo_area (13);
4463 DEFUN ("set-process-coding-system", Fset_process_coding_system
,
4464 Sset_process_coding_system
, 1, 3, 0,
4465 "Set coding systems of PROCESS to DECODING and ENCODING.\n\
4466 DECODING will be used to decode subprocess output and ENCODING to\n\
4467 encode subprocess input.")
4468 (proc
, decoding
, encoding
)
4469 register Lisp_Object proc
, decoding
, encoding
;
4471 register struct Lisp_Process
*p
;
4473 CHECK_PROCESS (proc
, 0);
4474 p
= XPROCESS (proc
);
4475 if (XINT (p
->infd
) < 0)
4476 error ("Input file descriptor of %s closed", XSTRING (p
->name
)->data
);
4477 if (XINT (p
->outfd
) < 0)
4478 error ("Output file descriptor of %s closed", XSTRING (p
->name
)->data
);
4480 p
->decode_coding_system
= Fcheck_coding_system (decoding
);
4481 p
->encode_coding_system
= Fcheck_coding_system (encoding
);
4482 setup_coding_system (decoding
,
4483 proc_decode_coding_system
[XINT (p
->infd
)]);
4484 setup_coding_system (encoding
,
4485 proc_encode_coding_system
[XINT (p
->outfd
)]);
4490 DEFUN ("process-coding-system",
4491 Fprocess_coding_system
, Sprocess_coding_system
, 1, 1, 0,
4492 "Return a cons of coding systems for decoding and encoding of PROCESS.")
4494 register Lisp_Object proc
;
4496 CHECK_PROCESS (proc
, 0);
4497 return Fcons (XPROCESS (proc
)->decode_coding_system
,
4498 XPROCESS (proc
)->encode_coding_system
);
4501 /* The first time this is called, assume keyboard input comes from DESC
4502 instead of from where we used to expect it.
4503 Subsequent calls mean assume input keyboard can come from DESC
4504 in addition to other places. */
4506 static int add_keyboard_wait_descriptor_called_flag
;
4509 add_keyboard_wait_descriptor (desc
)
4512 if (! add_keyboard_wait_descriptor_called_flag
)
4513 FD_CLR (0, &input_wait_mask
);
4514 add_keyboard_wait_descriptor_called_flag
= 1;
4515 FD_SET (desc
, &input_wait_mask
);
4516 FD_SET (desc
, &non_process_wait_mask
);
4517 if (desc
> max_keyboard_desc
)
4518 max_keyboard_desc
= desc
;
4521 /* From now on, do not expect DESC to give keyboard input. */
4524 delete_keyboard_wait_descriptor (desc
)
4528 int lim
= max_keyboard_desc
;
4530 FD_CLR (desc
, &input_wait_mask
);
4531 FD_CLR (desc
, &non_process_wait_mask
);
4533 if (desc
== max_keyboard_desc
)
4534 for (fd
= 0; fd
< lim
; fd
++)
4535 if (FD_ISSET (fd
, &input_wait_mask
)
4536 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4537 max_keyboard_desc
= fd
;
4540 /* Return nonzero if *MASK has a bit set
4541 that corresponds to one of the keyboard input descriptors. */
4544 keyboard_bit_set (mask
)
4549 for (fd
= 0; fd
<= max_keyboard_desc
; fd
++)
4550 if (FD_ISSET (fd
, mask
) && FD_ISSET (fd
, &input_wait_mask
)
4551 && !FD_ISSET (fd
, &non_keyboard_wait_mask
))
4564 if (! noninteractive
|| initialized
)
4566 signal (SIGCHLD
, sigchld_handler
);
4569 FD_ZERO (&input_wait_mask
);
4570 FD_ZERO (&non_keyboard_wait_mask
);
4571 FD_ZERO (&non_process_wait_mask
);
4572 max_process_desc
= 0;
4574 FD_SET (0, &input_wait_mask
);
4576 Vprocess_alist
= Qnil
;
4577 for (i
= 0; i
< MAXDESC
; i
++)
4579 chan_process
[i
] = Qnil
;
4580 proc_buffered_char
[i
] = -1;
4582 bzero (proc_decode_coding_system
, sizeof proc_decode_coding_system
);
4583 bzero (proc_encode_coding_system
, sizeof proc_encode_coding_system
);
4589 Qprocessp
= intern ("processp");
4590 staticpro (&Qprocessp
);
4591 Qrun
= intern ("run");
4593 Qstop
= intern ("stop");
4595 Qsignal
= intern ("signal");
4596 staticpro (&Qsignal
);
4598 /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it
4601 Qexit = intern ("exit");
4602 staticpro (&Qexit); */
4604 Qopen
= intern ("open");
4606 Qclosed
= intern ("closed");
4607 staticpro (&Qclosed
);
4609 Qlast_nonmenu_event
= intern ("last-nonmenu-event");
4610 staticpro (&Qlast_nonmenu_event
);
4612 staticpro (&Vprocess_alist
);
4614 DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes
,
4615 "*Non-nil means delete processes immediately when they exit.\n\
4616 nil means don't delete them until `list-processes' is run.");
4618 delete_exited_processes
= 1;
4620 DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type
,
4621 "Control type of device used to communicate with subprocesses.\n\
4622 Values are nil to use a pipe, or t or `pty' to use a pty.\n\
4623 The value has no effect if the system has no ptys or if all ptys are busy:\n\
4624 then a pipe is used in any case.\n\
4625 The value takes effect when `start-process' is called.");
4626 Vprocess_connection_type
= Qt
;
4628 defsubr (&Sprocessp
);
4629 defsubr (&Sget_process
);
4630 defsubr (&Sget_buffer_process
);
4631 defsubr (&Sdelete_process
);
4632 defsubr (&Sprocess_status
);
4633 defsubr (&Sprocess_exit_status
);
4634 defsubr (&Sprocess_id
);
4635 defsubr (&Sprocess_name
);
4636 defsubr (&Sprocess_tty_name
);
4637 defsubr (&Sprocess_command
);
4638 defsubr (&Sset_process_buffer
);
4639 defsubr (&Sprocess_buffer
);
4640 defsubr (&Sprocess_mark
);
4641 defsubr (&Sset_process_filter
);
4642 defsubr (&Sprocess_filter
);
4643 defsubr (&Sset_process_sentinel
);
4644 defsubr (&Sprocess_sentinel
);
4645 defsubr (&Sset_process_window_size
);
4646 defsubr (&Sset_process_inherit_coding_system_flag
);
4647 defsubr (&Sprocess_inherit_coding_system_flag
);
4648 defsubr (&Sprocess_kill_without_query
);
4649 defsubr (&Sprocess_contact
);
4650 defsubr (&Slist_processes
);
4651 defsubr (&Sprocess_list
);
4652 defsubr (&Sstart_process
);
4654 defsubr (&Sopen_network_stream
);
4655 #endif /* HAVE_SOCKETS */
4656 defsubr (&Saccept_process_output
);
4657 defsubr (&Sprocess_send_region
);
4658 defsubr (&Sprocess_send_string
);
4659 defsubr (&Sinterrupt_process
);
4660 defsubr (&Skill_process
);
4661 defsubr (&Squit_process
);
4662 defsubr (&Sstop_process
);
4663 defsubr (&Scontinue_process
);
4664 defsubr (&Sprocess_running_child_p
);
4665 defsubr (&Sprocess_send_eof
);
4666 defsubr (&Ssignal_process
);
4667 defsubr (&Swaiting_for_user_input_p
);
4668 /* defsubr (&Sprocess_connection); */
4669 defsubr (&Sset_process_coding_system
);
4670 defsubr (&Sprocess_coding_system
);
4674 #else /* not subprocesses */
4676 #include <sys/types.h>
4680 #include "systime.h"
4681 #include "charset.h"
4683 #include "termopts.h"
4684 #include "sysselect.h"
4686 extern int frame_garbaged
;
4688 extern EMACS_TIME
timer_check ();
4689 extern int timers_run
;
4691 /* As described above, except assuming that there are no subprocesses:
4693 Wait for timeout to elapse and/or keyboard input to be available.
4696 timeout in seconds, or
4697 zero for no limit, or
4698 -1 means gobble data immediately available but don't wait for any.
4700 read_kbd is a Lisp_Object:
4701 0 to ignore keyboard input, or
4702 1 to return when input is available, or
4703 -1 means caller will actually read the input, so don't throw to
4705 a cons cell, meaning wait until its car is non-nil
4706 (and gobble terminal input into the buffer if any arrives), or
4707 We know that read_kbd will never be a Lisp_Process, since
4708 `subprocesses' isn't defined.
4710 do_display != 0 means redisplay should be done to show subprocess
4711 output that arrives.
4713 Return true iff we received input from any process. */
4716 wait_reading_process_input (time_limit
, microsecs
, read_kbd
, do_display
)
4717 int time_limit
, microsecs
;
4718 Lisp_Object read_kbd
;
4722 EMACS_TIME end_time
, timeout
;
4723 SELECT_TYPE waitchannels
;
4725 Lisp_Object
*wait_for_cell
= 0;
4727 /* If waiting for non-nil in a cell, record where. */
4728 if (CONSP (read_kbd
))
4730 wait_for_cell
= &XCAR (read_kbd
);
4731 XSETFASTINT (read_kbd
, 0);
4734 /* What does time_limit really mean? */
4735 if (time_limit
|| microsecs
)
4737 EMACS_GET_TIME (end_time
);
4738 EMACS_SET_SECS_USECS (timeout
, time_limit
, microsecs
);
4739 EMACS_ADD_TIME (end_time
, end_time
, timeout
);
4742 /* Turn off periodic alarms (in case they are in use)
4743 because the select emulator uses alarms. */
4744 turn_on_atimers (0);
4748 int timeout_reduced_for_timers
= 0;
4750 /* If calling from keyboard input, do not quit
4751 since we want to return C-g as an input character.
4752 Otherwise, do pending quit if requested. */
4753 if (XINT (read_kbd
) >= 0)
4756 /* Exit now if the cell we're waiting for became non-nil. */
4757 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4760 /* Compute time from now till when time limit is up */
4761 /* Exit if already run out */
4762 if (time_limit
== -1)
4764 /* -1 specified for timeout means
4765 gobble output available now
4766 but don't wait at all. */
4768 EMACS_SET_SECS_USECS (timeout
, 0, 0);
4770 else if (time_limit
|| microsecs
)
4772 EMACS_GET_TIME (timeout
);
4773 EMACS_SUB_TIME (timeout
, end_time
, timeout
);
4774 if (EMACS_TIME_NEG_P (timeout
))
4779 EMACS_SET_SECS_USECS (timeout
, 100000, 0);
4782 /* If our caller will not immediately handle keyboard events,
4783 run timer events directly.
4784 (Callers that will immediately read keyboard events
4785 call timer_delay on their own.) */
4786 if (! wait_for_cell
)
4788 EMACS_TIME timer_delay
;
4792 int old_timers_run
= timers_run
;
4793 timer_delay
= timer_check (1);
4794 if (timers_run
!= old_timers_run
&& do_display
)
4795 /* We must retry, since a timer may have requeued itself
4796 and that could alter the time delay. */
4797 redisplay_preserve_echo_area (14);
4801 while (!detect_input_pending ());
4803 /* If there is unread keyboard input, also return. */
4804 if (XINT (read_kbd
) != 0
4805 && requeued_events_pending_p ())
4808 if (! EMACS_TIME_NEG_P (timer_delay
) && time_limit
!= -1)
4810 EMACS_TIME difference
;
4811 EMACS_SUB_TIME (difference
, timer_delay
, timeout
);
4812 if (EMACS_TIME_NEG_P (difference
))
4814 timeout
= timer_delay
;
4815 timeout_reduced_for_timers
= 1;
4820 /* Cause C-g and alarm signals to take immediate action,
4821 and cause input available signals to zero out timeout. */
4822 if (XINT (read_kbd
) < 0)
4823 set_waiting_for_input (&timeout
);
4825 /* Wait till there is something to do. */
4827 if (! XINT (read_kbd
) && wait_for_cell
== 0)
4828 FD_ZERO (&waitchannels
);
4830 FD_SET (0, &waitchannels
);
4832 /* If a frame has been newly mapped and needs updating,
4833 reprocess its display stuff. */
4834 if (frame_garbaged
&& do_display
)
4836 clear_waiting_for_input ();
4837 redisplay_preserve_echo_area (15);
4838 if (XINT (read_kbd
) < 0)
4839 set_waiting_for_input (&timeout
);
4842 if (XINT (read_kbd
) && detect_input_pending ())
4845 FD_ZERO (&waitchannels
);
4848 nfds
= select (1, &waitchannels
, (SELECT_TYPE
*)0, (SELECT_TYPE
*)0,
4853 /* Make C-g and alarm signals set flags again */
4854 clear_waiting_for_input ();
4856 /* If we woke up due to SIGWINCH, actually change size now. */
4857 do_pending_window_change (0);
4859 if (time_limit
&& nfds
== 0 && ! timeout_reduced_for_timers
)
4860 /* We waited the full specified time, so return now. */
4865 /* If the system call was interrupted, then go around the
4867 if (xerrno
== EINTR
)
4868 FD_ZERO (&waitchannels
);
4870 error ("select error: %s", emacs_strerror (xerrno
));
4873 else if (nfds
> 0 && (waitchannels
& 1) && interrupt_input
)
4874 /* System sometimes fails to deliver SIGIO. */
4875 kill (getpid (), SIGIO
);
4878 if (XINT (read_kbd
) && interrupt_input
&& (waitchannels
& 1))
4879 kill (getpid (), SIGIO
);
4882 /* Check for keyboard input */
4884 if ((XINT (read_kbd
) != 0)
4885 && detect_input_pending_run_timers (do_display
))
4887 swallow_events (do_display
);
4888 if (detect_input_pending_run_timers (do_display
))
4892 /* If there is unread keyboard input, also return. */
4893 if (XINT (read_kbd
) != 0
4894 && requeued_events_pending_p ())
4897 /* If wait_for_cell. check for keyboard input
4898 but don't run any timers.
4899 ??? (It seems wrong to me to check for keyboard
4900 input at all when wait_for_cell, but the code
4901 has been this way since July 1994.
4902 Try changing this after version 19.31.) */
4904 && detect_input_pending ())
4906 swallow_events (do_display
);
4907 if (detect_input_pending ())
4911 /* Exit now if the cell we're waiting for became non-nil. */
4912 if (wait_for_cell
&& ! NILP (*wait_for_cell
))
4922 DEFUN ("get-buffer-process", Fget_buffer_process
, Sget_buffer_process
, 1, 1, 0,
4923 /* Don't confuse make-docfile by having two doc strings for this function.
4924 make-docfile does not pay attention to #if, for good reason! */
4927 register Lisp_Object name
;
4932 DEFUN ("process-inherit-coding-system-flag",
4933 Fprocess_inherit_coding_system_flag
, Sprocess_inherit_coding_system_flag
,
4935 /* Don't confuse make-docfile by having two doc strings for this function.
4936 make-docfile does not pay attention to #if, for good reason! */
4939 register Lisp_Object process
;
4941 /* Ignore the argument and return the value of
4942 inherit-process-coding-system. */
4943 return inherit_process_coding_system
? Qt
: Qnil
;
4946 /* Kill all processes associated with `buffer'.
4947 If `buffer' is nil, kill all processes.
4948 Since we have no subprocesses, this does nothing. */
4951 kill_buffer_processes (buffer
)
4964 defsubr (&Sget_buffer_process
);
4965 defsubr (&Sprocess_inherit_coding_system_flag
);
4969 #endif /* not subprocesses */