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[emacs.git] / src / callproc.c
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1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2011
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 3 of the License, or
10 (at your option) any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
21 #include <config.h>
22 #include <signal.h>
23 #include <errno.h>
24 #include <stdio.h>
25 #include <setjmp.h>
26 #include <sys/types.h>
27 #include <unistd.h>
29 #include <sys/file.h>
30 #include <fcntl.h>
32 #include "lisp.h"
34 #ifdef WINDOWSNT
35 #define NOMINMAX
36 #include <windows.h>
37 #include "w32.h"
38 #define _P_NOWAIT 1 /* from process.h */
39 #endif
41 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
42 #include <sys/stat.h>
43 #include <sys/param.h>
44 #endif /* MSDOS */
46 #include "commands.h"
47 #include "buffer.h"
48 #include "character.h"
49 #include "ccl.h"
50 #include "coding.h"
51 #include "composite.h"
52 #include <epaths.h>
53 #include "process.h"
54 #include "syssignal.h"
55 #include "systty.h"
56 #include "blockinput.h"
57 #include "frame.h"
58 #include "termhooks.h"
60 #ifdef MSDOS
61 #include "msdos.h"
62 #endif
64 #ifndef USE_CRT_DLL
65 extern char **environ;
66 #endif
68 #ifdef HAVE_SETPGID
69 #if !defined (USG)
70 #undef setpgrp
71 #define setpgrp setpgid
72 #endif
73 #endif
75 /* Pattern used by call-process-region to make temp files. */
76 static Lisp_Object Vtemp_file_name_pattern;
78 /* True if we are about to fork off a synchronous process or if we
79 are waiting for it. */
80 int synch_process_alive;
82 /* Nonzero => this is a string explaining death of synchronous subprocess. */
83 const char *synch_process_death;
85 /* Nonzero => this is the signal number that terminated the subprocess. */
86 int synch_process_termsig;
88 /* If synch_process_death is zero,
89 this is exit code of synchronous subprocess. */
90 int synch_process_retcode;
93 /* Clean up when exiting Fcall_process.
94 On MSDOS, delete the temporary file on any kind of termination.
95 On Unix, kill the process and any children on termination by signal. */
97 /* Nonzero if this is termination due to exit. */
98 static int call_process_exited;
100 static Lisp_Object Fgetenv_internal (Lisp_Object, Lisp_Object);
102 static Lisp_Object
103 call_process_kill (Lisp_Object fdpid)
105 emacs_close (XFASTINT (Fcar (fdpid)));
106 EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL);
107 synch_process_alive = 0;
108 return Qnil;
111 static Lisp_Object
112 call_process_cleanup (Lisp_Object arg)
114 Lisp_Object fdpid = Fcdr (arg);
115 #if defined (MSDOS)
116 Lisp_Object file;
117 int fd;
118 #else
119 int pid;
120 #endif
122 Fset_buffer (Fcar (arg));
124 #if defined (MSDOS)
125 /* for MSDOS fdpid is really (fd . tempfile) */
126 fd = XFASTINT (Fcar (fdpid));
127 file = Fcdr (fdpid);
128 /* FD is -1 and FILE is "" when we didn't actually create a
129 temporary file in call-process. */
130 if (fd >= 0)
131 emacs_close (fd);
132 if (!(strcmp (SDATA (file), NULL_DEVICE) == 0 || SREF (file, 0) == '\0'))
133 unlink (SDATA (file));
134 #else /* not MSDOS */
135 pid = XFASTINT (Fcdr (fdpid));
137 if (call_process_exited)
139 emacs_close (XFASTINT (Fcar (fdpid)));
140 return Qnil;
143 if (EMACS_KILLPG (pid, SIGINT) == 0)
145 int count = SPECPDL_INDEX ();
146 record_unwind_protect (call_process_kill, fdpid);
147 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
148 immediate_quit = 1;
149 QUIT;
150 wait_for_termination (pid);
151 immediate_quit = 0;
152 specpdl_ptr = specpdl + count; /* Discard the unwind protect. */
153 message1 ("Waiting for process to die...done");
155 synch_process_alive = 0;
156 emacs_close (XFASTINT (Fcar (fdpid)));
157 #endif /* not MSDOS */
158 return Qnil;
161 DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
162 doc: /* Call PROGRAM synchronously in separate process.
163 The remaining arguments are optional.
164 The program's input comes from file INFILE (nil means `/dev/null').
165 Insert output in BUFFER before point; t means current buffer; nil for BUFFER
166 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
167 FILE is a file name string, means that it should be written to that file.
168 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
169 REAL-BUFFER says what to do with standard output, as above,
170 while STDERR-FILE says what to do with standard error in the child.
171 STDERR-FILE may be nil (discard standard error output),
172 t (mix it with ordinary output), or a file name string.
174 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
175 Remaining arguments are strings passed as command arguments to PROGRAM.
177 If executable PROGRAM can't be found as an executable, `call-process'
178 signals a Lisp error. `call-process' reports errors in execution of
179 the program only through its return and output.
181 If BUFFER is 0, `call-process' returns immediately with value nil.
182 Otherwise it waits for PROGRAM to terminate
183 and returns a numeric exit status or a signal description string.
184 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
186 usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS) */)
187 (ptrdiff_t nargs, Lisp_Object *args)
189 Lisp_Object infile, buffer, current_dir, path;
190 volatile int display_p_volatile;
191 int fd[2];
192 int filefd;
193 register int pid;
194 #define CALLPROC_BUFFER_SIZE_MIN (16 * 1024)
195 #define CALLPROC_BUFFER_SIZE_MAX (4 * CALLPROC_BUFFER_SIZE_MIN)
196 char buf[CALLPROC_BUFFER_SIZE_MAX];
197 int bufsize = CALLPROC_BUFFER_SIZE_MIN;
198 int count = SPECPDL_INDEX ();
199 volatile USE_SAFE_ALLOCA;
201 register const unsigned char **new_argv;
202 /* File to use for stderr in the child.
203 t means use same as standard output. */
204 Lisp_Object error_file;
205 Lisp_Object output_file = Qnil;
206 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
207 char *outf, *tempfile = NULL;
208 int outfilefd;
209 #endif
210 int fd_output = -1;
211 struct coding_system process_coding; /* coding-system of process output */
212 struct coding_system argument_coding; /* coding-system of arguments */
213 /* Set to the return value of Ffind_operation_coding_system. */
214 Lisp_Object coding_systems;
215 int output_to_buffer = 1;
217 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
218 coding_systems = Qt;
220 CHECK_STRING (args[0]);
222 error_file = Qt;
224 #ifndef subprocesses
225 /* Without asynchronous processes we cannot have BUFFER == 0. */
226 if (nargs >= 3
227 && (INTEGERP (CONSP (args[2]) ? XCAR (args[2]) : args[2])))
228 error ("Operating system cannot handle asynchronous subprocesses");
229 #endif /* subprocesses */
231 /* Decide the coding-system for giving arguments. */
233 Lisp_Object val, *args2;
234 ptrdiff_t i;
236 /* If arguments are supplied, we may have to encode them. */
237 if (nargs >= 5)
239 int must_encode = 0;
240 Lisp_Object coding_attrs;
242 for (i = 4; i < nargs; i++)
243 CHECK_STRING (args[i]);
245 for (i = 4; i < nargs; i++)
246 if (STRING_MULTIBYTE (args[i]))
247 must_encode = 1;
249 if (!NILP (Vcoding_system_for_write))
250 val = Vcoding_system_for_write;
251 else if (! must_encode)
252 val = Qraw_text;
253 else
255 SAFE_ALLOCA (args2, Lisp_Object *, (nargs + 1) * sizeof *args2);
256 args2[0] = Qcall_process;
257 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
258 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
259 val = CONSP (coding_systems) ? XCDR (coding_systems) : Qnil;
261 val = complement_process_encoding_system (val);
262 setup_coding_system (Fcheck_coding_system (val), &argument_coding);
263 coding_attrs = CODING_ID_ATTRS (argument_coding.id);
264 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs)))
266 /* We should not use an ASCII incompatible coding system. */
267 val = raw_text_coding_system (val);
268 setup_coding_system (val, &argument_coding);
273 if (nargs >= 2 && ! NILP (args[1]))
275 infile = Fexpand_file_name (args[1], BVAR (current_buffer, directory));
276 CHECK_STRING (infile);
278 else
279 infile = build_string (NULL_DEVICE);
281 if (nargs >= 3)
283 buffer = args[2];
285 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
286 FILE-FOR-STDERR), unless the first element is :file, in which case see
287 the next paragraph. */
288 if (CONSP (buffer)
289 && (! SYMBOLP (XCAR (buffer))
290 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer))), ":file")))
292 if (CONSP (XCDR (buffer)))
294 Lisp_Object stderr_file;
295 stderr_file = XCAR (XCDR (buffer));
297 if (NILP (stderr_file) || EQ (Qt, stderr_file))
298 error_file = stderr_file;
299 else
300 error_file = Fexpand_file_name (stderr_file, Qnil);
303 buffer = XCAR (buffer);
306 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
307 if (CONSP (buffer)
308 && SYMBOLP (XCAR (buffer))
309 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer))), ":file"))
311 output_file = Fexpand_file_name (XCAR (XCDR (buffer)),
312 BVAR (current_buffer, directory));
313 CHECK_STRING (output_file);
314 buffer = Qnil;
317 if (!(EQ (buffer, Qnil)
318 || EQ (buffer, Qt)
319 || INTEGERP (buffer)))
321 Lisp_Object spec_buffer;
322 spec_buffer = buffer;
323 buffer = Fget_buffer_create (buffer);
324 /* Mention the buffer name for a better error message. */
325 if (NILP (buffer))
326 CHECK_BUFFER (spec_buffer);
327 CHECK_BUFFER (buffer);
330 else
331 buffer = Qnil;
333 /* Make sure that the child will be able to chdir to the current
334 buffer's current directory, or its unhandled equivalent. We
335 can't just have the child check for an error when it does the
336 chdir, since it's in a vfork.
338 We have to GCPRO around this because Fexpand_file_name,
339 Funhandled_file_name_directory, and Ffile_accessible_directory_p
340 might call a file name handling function. The argument list is
341 protected by the caller, so all we really have to worry about is
342 buffer. */
344 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
346 current_dir = BVAR (current_buffer, directory);
348 GCPRO5 (infile, buffer, current_dir, error_file, output_file);
350 current_dir = Funhandled_file_name_directory (current_dir);
351 if (NILP (current_dir))
352 /* If the file name handler says that current_dir is unreachable, use
353 a sensible default. */
354 current_dir = build_string ("~/");
355 current_dir = expand_and_dir_to_file (current_dir, Qnil);
356 current_dir = Ffile_name_as_directory (current_dir);
358 if (NILP (Ffile_accessible_directory_p (current_dir)))
359 report_file_error ("Setting current directory",
360 Fcons (BVAR (current_buffer, directory), Qnil));
362 if (STRING_MULTIBYTE (infile))
363 infile = ENCODE_FILE (infile);
364 if (STRING_MULTIBYTE (current_dir))
365 current_dir = ENCODE_FILE (current_dir);
366 if (STRINGP (error_file) && STRING_MULTIBYTE (error_file))
367 error_file = ENCODE_FILE (error_file);
368 if (STRINGP (output_file) && STRING_MULTIBYTE (output_file))
369 output_file = ENCODE_FILE (output_file);
370 UNGCPRO;
373 display_p_volatile = INTERACTIVE && nargs >= 4 && !NILP (args[3]);
375 filefd = emacs_open (SSDATA (infile), O_RDONLY, 0);
376 if (filefd < 0)
378 infile = DECODE_FILE (infile);
379 report_file_error ("Opening process input file", Fcons (infile, Qnil));
382 if (STRINGP (output_file))
384 #ifdef DOS_NT
385 fd_output = emacs_open (SSDATA (output_file),
386 O_WRONLY | O_TRUNC | O_CREAT | O_TEXT,
387 S_IREAD | S_IWRITE);
388 #else /* not DOS_NT */
389 fd_output = creat (SSDATA (output_file), 0666);
390 #endif /* not DOS_NT */
391 if (fd_output < 0)
393 output_file = DECODE_FILE (output_file);
394 report_file_error ("Opening process output file",
395 Fcons (output_file, Qnil));
397 if (STRINGP (error_file) || NILP (error_file))
398 output_to_buffer = 0;
401 /* Search for program; barf if not found. */
403 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
405 GCPRO4 (infile, buffer, current_dir, error_file);
406 openp (Vexec_path, args[0], Vexec_suffixes, &path, make_number (X_OK));
407 UNGCPRO;
409 if (NILP (path))
411 emacs_close (filefd);
412 report_file_error ("Searching for program", Fcons (args[0], Qnil));
415 /* If program file name starts with /: for quoting a magic name,
416 discard that. */
417 if (SBYTES (path) > 2 && SREF (path, 0) == '/'
418 && SREF (path, 1) == ':')
419 path = Fsubstring (path, make_number (2), Qnil);
421 SAFE_ALLOCA (new_argv, const unsigned char **,
422 (nargs > 4 ? nargs - 2 : 2) * sizeof *new_argv);
423 if (nargs > 4)
425 ptrdiff_t i;
426 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
428 GCPRO5 (infile, buffer, current_dir, path, error_file);
429 argument_coding.dst_multibyte = 0;
430 for (i = 4; i < nargs; i++)
432 argument_coding.src_multibyte = STRING_MULTIBYTE (args[i]);
433 if (CODING_REQUIRE_ENCODING (&argument_coding))
434 /* We must encode this argument. */
435 args[i] = encode_coding_string (&argument_coding, args[i], 1);
437 UNGCPRO;
438 for (i = 4; i < nargs; i++)
439 new_argv[i - 3] = SDATA (args[i]);
440 new_argv[i - 3] = 0;
442 else
443 new_argv[1] = 0;
444 new_argv[0] = SDATA (path);
446 #ifdef MSDOS /* MW, July 1993 */
448 /* If we're redirecting STDOUT to a file, that file is already open
449 on fd_output. */
450 if (fd_output < 0)
452 if ((outf = egetenv ("TMPDIR")))
453 strcpy (tempfile = alloca (strlen (outf) + 20), outf);
454 else
456 tempfile = alloca (20);
457 *tempfile = '\0';
459 dostounix_filename (tempfile);
460 if (*tempfile == '\0' || tempfile[strlen (tempfile) - 1] != '/')
461 strcat (tempfile, "/");
462 strcat (tempfile, "detmp.XXX");
463 mktemp (tempfile);
464 outfilefd = creat (tempfile, S_IREAD | S_IWRITE);
465 if (outfilefd < 0) {
466 emacs_close (filefd);
467 report_file_error ("Opening process output file",
468 Fcons (build_string (tempfile), Qnil));
471 else
472 outfilefd = fd_output;
473 fd[0] = filefd;
474 fd[1] = outfilefd;
475 #endif /* MSDOS */
477 if (INTEGERP (buffer))
478 fd[1] = emacs_open (NULL_DEVICE, O_WRONLY, 0), fd[0] = -1;
479 else
481 #ifndef MSDOS
482 errno = 0;
483 if (pipe (fd) == -1)
485 emacs_close (filefd);
486 report_file_error ("Creating process pipe", Qnil);
488 #endif
492 /* child_setup must clobber environ in systems with true vfork.
493 Protect it from permanent change. */
494 register char **save_environ = environ;
495 register int fd1 = fd[1];
496 int fd_error = fd1;
497 #ifdef HAVE_WORKING_VFORK
498 sigset_t procmask;
499 sigset_t blocked;
500 struct sigaction sigpipe_action;
501 #endif
503 if (fd_output >= 0)
504 fd1 = fd_output;
505 #if 0 /* Some systems don't have sigblock. */
506 mask = sigblock (sigmask (SIGCHLD));
507 #endif
509 /* Record that we're about to create a synchronous process. */
510 synch_process_alive = 1;
512 /* These vars record information from process termination.
513 Clear them now before process can possibly terminate,
514 to avoid timing error if process terminates soon. */
515 synch_process_death = 0;
516 synch_process_retcode = 0;
517 synch_process_termsig = 0;
519 if (NILP (error_file))
520 fd_error = emacs_open (NULL_DEVICE, O_WRONLY, 0);
521 else if (STRINGP (error_file))
523 #ifdef DOS_NT
524 fd_error = emacs_open (SSDATA (error_file),
525 O_WRONLY | O_TRUNC | O_CREAT | O_TEXT,
526 S_IREAD | S_IWRITE);
527 #else /* not DOS_NT */
528 fd_error = creat (SSDATA (error_file), 0666);
529 #endif /* not DOS_NT */
532 if (fd_error < 0)
534 emacs_close (filefd);
535 if (fd[0] != filefd)
536 emacs_close (fd[0]);
537 if (fd1 >= 0)
538 emacs_close (fd1);
539 #ifdef MSDOS
540 unlink (tempfile);
541 #endif
542 if (NILP (error_file))
543 error_file = build_string (NULL_DEVICE);
544 else if (STRINGP (error_file))
545 error_file = DECODE_FILE (error_file);
546 report_file_error ("Cannot redirect stderr", Fcons (error_file, Qnil));
549 #ifdef MSDOS /* MW, July 1993 */
550 /* Note that on MSDOS `child_setup' actually returns the child process
551 exit status, not its PID, so we assign it to `synch_process_retcode'
552 below. */
553 pid = child_setup (filefd, outfilefd, fd_error, (char **) new_argv,
554 0, current_dir);
556 /* Record that the synchronous process exited and note its
557 termination status. */
558 synch_process_alive = 0;
559 synch_process_retcode = pid;
560 if (synch_process_retcode < 0) /* means it couldn't be exec'ed */
562 synchronize_system_messages_locale ();
563 synch_process_death = strerror (errno);
566 emacs_close (outfilefd);
567 if (fd_error != outfilefd)
568 emacs_close (fd_error);
569 fd1 = -1; /* No harm in closing that one! */
570 if (tempfile)
572 /* Since CRLF is converted to LF within `decode_coding', we
573 can always open a file with binary mode. */
574 fd[0] = emacs_open (tempfile, O_RDONLY | O_BINARY, 0);
575 if (fd[0] < 0)
577 unlink (tempfile);
578 emacs_close (filefd);
579 report_file_error ("Cannot re-open temporary file",
580 Fcons (build_string (tempfile), Qnil));
583 else
584 fd[0] = -1; /* We are not going to read from tempfile. */
585 #else /* not MSDOS */
586 #ifdef WINDOWSNT
587 pid = child_setup (filefd, fd1, fd_error, (char **) new_argv,
588 0, current_dir);
589 #else /* not WINDOWSNT */
591 #ifdef HAVE_WORKING_VFORK
592 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
593 this sets the parent's signal handlers as well as the child's.
594 So delay all interrupts whose handlers the child might munge,
595 and record the current handlers so they can be restored later. */
596 sigemptyset (&blocked);
597 sigaddset (&blocked, SIGPIPE);
598 sigaction (SIGPIPE, 0, &sigpipe_action);
599 pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
600 #endif
602 BLOCK_INPUT;
604 /* vfork, and prevent local vars from being clobbered by the vfork. */
606 int volatile fd_error_volatile = fd_error;
607 int volatile fd_output_volatile = fd_output;
608 int volatile output_to_buffer_volatile = output_to_buffer;
609 unsigned char const **volatile new_argv_volatile = new_argv;
611 pid = vfork ();
613 fd_error = fd_error_volatile;
614 fd_output = fd_output_volatile;
615 output_to_buffer = output_to_buffer_volatile;
616 new_argv = new_argv_volatile;
619 if (pid == 0)
621 if (fd[0] >= 0)
622 emacs_close (fd[0]);
623 #ifdef HAVE_SETSID
624 setsid ();
625 #endif
626 #if defined (USG)
627 setpgrp ();
628 #else
629 setpgrp (pid, pid);
630 #endif /* USG */
632 /* GConf causes us to ignore SIGPIPE, make sure it is restored
633 in the child. */
634 //signal (SIGPIPE, SIG_DFL);
635 #ifdef HAVE_WORKING_VFORK
636 pthread_sigmask (SIG_SETMASK, &procmask, 0);
637 #endif
639 child_setup (filefd, fd1, fd_error, (char **) new_argv,
640 0, current_dir);
643 UNBLOCK_INPUT;
645 #ifdef HAVE_WORKING_VFORK
646 /* Restore the signal state. */
647 sigaction (SIGPIPE, &sigpipe_action, 0);
648 pthread_sigmask (SIG_SETMASK, &procmask, 0);
649 #endif
651 #endif /* not WINDOWSNT */
653 /* The MSDOS case did this already. */
654 if (fd_error >= 0)
655 emacs_close (fd_error);
656 #endif /* not MSDOS */
658 environ = save_environ;
660 /* Close most of our fd's, but not fd[0]
661 since we will use that to read input from. */
662 emacs_close (filefd);
663 if (fd_output >= 0)
664 emacs_close (fd_output);
665 if (fd1 >= 0 && fd1 != fd_error)
666 emacs_close (fd1);
669 if (pid < 0)
671 if (fd[0] >= 0)
672 emacs_close (fd[0]);
673 report_file_error ("Doing vfork", Qnil);
676 if (INTEGERP (buffer))
678 if (fd[0] >= 0)
679 emacs_close (fd[0]);
680 return Qnil;
683 /* Enable sending signal if user quits below. */
684 call_process_exited = 0;
686 #if defined(MSDOS)
687 /* MSDOS needs different cleanup information. */
688 record_unwind_protect (call_process_cleanup,
689 Fcons (Fcurrent_buffer (),
690 Fcons (make_number (fd[0]),
691 build_string (tempfile ? tempfile : ""))));
692 #else
693 record_unwind_protect (call_process_cleanup,
694 Fcons (Fcurrent_buffer (),
695 Fcons (make_number (fd[0]), make_number (pid))));
696 #endif /* not MSDOS */
699 if (BUFFERP (buffer))
700 Fset_buffer (buffer);
702 if (NILP (buffer))
704 /* If BUFFER is nil, we must read process output once and then
705 discard it, so setup coding system but with nil. */
706 setup_coding_system (Qnil, &process_coding);
708 else
710 Lisp_Object val, *args2;
712 val = Qnil;
713 if (!NILP (Vcoding_system_for_read))
714 val = Vcoding_system_for_read;
715 else
717 if (EQ (coding_systems, Qt))
719 ptrdiff_t i;
721 SAFE_ALLOCA (args2, Lisp_Object *, (nargs + 1) * sizeof *args2);
722 args2[0] = Qcall_process;
723 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
724 coding_systems
725 = Ffind_operation_coding_system (nargs + 1, args2);
727 if (CONSP (coding_systems))
728 val = XCAR (coding_systems);
729 else if (CONSP (Vdefault_process_coding_system))
730 val = XCAR (Vdefault_process_coding_system);
731 else
732 val = Qnil;
734 Fcheck_coding_system (val);
735 /* In unibyte mode, character code conversion should not take
736 place but EOL conversion should. So, setup raw-text or one
737 of the subsidiary according to the information just setup. */
738 if (NILP (BVAR (current_buffer, enable_multibyte_characters))
739 && !NILP (val))
740 val = raw_text_coding_system (val);
741 setup_coding_system (val, &process_coding);
744 immediate_quit = 1;
745 QUIT;
747 if (output_to_buffer)
749 register EMACS_INT nread;
750 int first = 1;
751 EMACS_INT total_read = 0;
752 int carryover = 0;
753 int display_p = display_p_volatile;
754 int display_on_the_fly = display_p;
755 struct coding_system saved_coding;
757 saved_coding = process_coding;
758 while (1)
760 /* Repeatedly read until we've filled as much as possible
761 of the buffer size we have. But don't read
762 less than 1024--save that for the next bufferful. */
763 nread = carryover;
764 while (nread < bufsize - 1024)
766 int this_read = emacs_read (fd[0], buf + nread,
767 bufsize - nread);
769 if (this_read < 0)
770 goto give_up;
772 if (this_read == 0)
774 process_coding.mode |= CODING_MODE_LAST_BLOCK;
775 break;
778 nread += this_read;
779 total_read += this_read;
781 if (display_on_the_fly)
782 break;
785 /* Now NREAD is the total amount of data in the buffer. */
786 immediate_quit = 0;
788 if (!NILP (buffer))
790 if (NILP (BVAR (current_buffer, enable_multibyte_characters))
791 && ! CODING_MAY_REQUIRE_DECODING (&process_coding))
792 insert_1_both (buf, nread, nread, 0, 1, 0);
793 else
794 { /* We have to decode the input. */
795 Lisp_Object curbuf;
796 int count1 = SPECPDL_INDEX ();
798 XSETBUFFER (curbuf, current_buffer);
799 /* We cannot allow after-change-functions be run
800 during decoding, because that might modify the
801 buffer, while we rely on process_coding.produced to
802 faithfully reflect inserted text until we
803 TEMP_SET_PT_BOTH below. */
804 specbind (Qinhibit_modification_hooks, Qt);
805 decode_coding_c_string (&process_coding,
806 (unsigned char *) buf, nread, curbuf);
807 unbind_to (count1, Qnil);
808 if (display_on_the_fly
809 && CODING_REQUIRE_DETECTION (&saved_coding)
810 && ! CODING_REQUIRE_DETECTION (&process_coding))
812 /* We have detected some coding system. But,
813 there's a possibility that the detection was
814 done by insufficient data. So, we give up
815 displaying on the fly. */
816 if (process_coding.produced > 0)
817 del_range_2 (process_coding.dst_pos,
818 process_coding.dst_pos_byte,
819 process_coding.dst_pos
820 + process_coding.produced_char,
821 process_coding.dst_pos_byte
822 + process_coding.produced, 0);
823 display_on_the_fly = 0;
824 process_coding = saved_coding;
825 carryover = nread;
826 /* This is to make the above condition always
827 fails in the future. */
828 saved_coding.common_flags
829 &= ~CODING_REQUIRE_DETECTION_MASK;
830 continue;
833 TEMP_SET_PT_BOTH (PT + process_coding.produced_char,
834 PT_BYTE + process_coding.produced);
835 carryover = process_coding.carryover_bytes;
836 if (carryover > 0)
837 memcpy (buf, process_coding.carryover,
838 process_coding.carryover_bytes);
842 if (process_coding.mode & CODING_MODE_LAST_BLOCK)
843 break;
845 /* Make the buffer bigger as we continue to read more data,
846 but not past CALLPROC_BUFFER_SIZE_MAX. */
847 if (bufsize < CALLPROC_BUFFER_SIZE_MAX && total_read > 32 * bufsize)
848 if ((bufsize *= 2) > CALLPROC_BUFFER_SIZE_MAX)
849 bufsize = CALLPROC_BUFFER_SIZE_MAX;
851 if (display_p)
853 if (first)
854 prepare_menu_bars ();
855 first = 0;
856 redisplay_preserve_echo_area (1);
857 /* This variable might have been set to 0 for code
858 detection. In that case, we set it back to 1 because
859 we should have already detected a coding system. */
860 display_on_the_fly = 1;
862 immediate_quit = 1;
863 QUIT;
865 give_up: ;
867 Vlast_coding_system_used = CODING_ID_NAME (process_coding.id);
868 /* If the caller required, let the buffer inherit the
869 coding-system used to decode the process output. */
870 if (inherit_process_coding_system)
871 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
872 make_number (total_read));
875 #ifndef MSDOS
876 /* Wait for it to terminate, unless it already has. */
877 if (output_to_buffer)
878 wait_for_termination (pid);
879 else
880 interruptible_wait_for_termination (pid);
881 #endif
883 immediate_quit = 0;
885 /* Don't kill any children that the subprocess may have left behind
886 when exiting. */
887 call_process_exited = 1;
889 SAFE_FREE ();
890 unbind_to (count, Qnil);
892 if (synch_process_termsig)
894 const char *signame;
896 synchronize_system_messages_locale ();
897 signame = strsignal (synch_process_termsig);
899 if (signame == 0)
900 signame = "unknown";
902 synch_process_death = signame;
905 if (synch_process_death)
906 return code_convert_string_norecord (build_string (synch_process_death),
907 Vlocale_coding_system, 0);
908 return make_number (synch_process_retcode);
911 static Lisp_Object
912 delete_temp_file (Lisp_Object name)
914 /* Suppress jka-compr handling, etc. */
915 int count = SPECPDL_INDEX ();
916 specbind (intern ("file-name-handler-alist"), Qnil);
917 internal_delete_file (name);
918 unbind_to (count, Qnil);
919 return Qnil;
922 DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
923 3, MANY, 0,
924 doc: /* Send text from START to END to a synchronous process running PROGRAM.
925 The remaining arguments are optional.
926 Delete the text if fourth arg DELETE is non-nil.
928 Insert output in BUFFER before point; t means current buffer; nil for
929 BUFFER means discard it; 0 means discard and don't wait; and `(:file
930 FILE)', where FILE is a file name string, means that it should be
931 written to that file.
932 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
933 REAL-BUFFER says what to do with standard output, as above,
934 while STDERR-FILE says what to do with standard error in the child.
935 STDERR-FILE may be nil (discard standard error output),
936 t (mix it with ordinary output), or a file name string.
938 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
939 Remaining args are passed to PROGRAM at startup as command args.
941 If BUFFER is 0, `call-process-region' returns immediately with value nil.
942 Otherwise it waits for PROGRAM to terminate
943 and returns a numeric exit status or a signal description string.
944 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
946 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
947 (ptrdiff_t nargs, Lisp_Object *args)
949 struct gcpro gcpro1;
950 Lisp_Object filename_string;
951 register Lisp_Object start, end;
952 int count = SPECPDL_INDEX ();
953 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
954 Lisp_Object coding_systems;
955 Lisp_Object val, *args2;
956 ptrdiff_t i;
957 char *tempfile;
958 Lisp_Object tmpdir, pattern;
960 if (STRINGP (Vtemporary_file_directory))
961 tmpdir = Vtemporary_file_directory;
962 else
964 #ifndef DOS_NT
965 if (getenv ("TMPDIR"))
966 tmpdir = build_string (getenv ("TMPDIR"));
967 else
968 tmpdir = build_string ("/tmp/");
969 #else /* DOS_NT */
970 char *outf;
971 if ((outf = egetenv ("TMPDIR"))
972 || (outf = egetenv ("TMP"))
973 || (outf = egetenv ("TEMP")))
974 tmpdir = build_string (outf);
975 else
976 tmpdir = Ffile_name_as_directory (build_string ("c:/temp"));
977 #endif
981 USE_SAFE_ALLOCA;
982 pattern = Fexpand_file_name (Vtemp_file_name_pattern, tmpdir);
983 SAFE_ALLOCA (tempfile, char *, SBYTES (pattern) + 1);
984 memcpy (tempfile, SDATA (pattern), SBYTES (pattern) + 1);
985 coding_systems = Qt;
987 #ifdef HAVE_MKSTEMP
989 int fd;
991 BLOCK_INPUT;
992 fd = mkstemp (tempfile);
993 UNBLOCK_INPUT;
994 if (fd == -1)
995 report_file_error ("Failed to open temporary file",
996 Fcons (Vtemp_file_name_pattern, Qnil));
997 else
998 close (fd);
1000 #else
1001 mktemp (tempfile);
1002 #endif
1004 filename_string = build_string (tempfile);
1005 GCPRO1 (filename_string);
1006 SAFE_FREE ();
1009 start = args[0];
1010 end = args[1];
1011 /* Decide coding-system of the contents of the temporary file. */
1012 if (!NILP (Vcoding_system_for_write))
1013 val = Vcoding_system_for_write;
1014 else if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
1015 val = Qraw_text;
1016 else
1018 USE_SAFE_ALLOCA;
1019 SAFE_ALLOCA (args2, Lisp_Object *, (nargs + 1) * sizeof *args2);
1020 args2[0] = Qcall_process_region;
1021 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1022 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1023 val = CONSP (coding_systems) ? XCDR (coding_systems) : Qnil;
1024 SAFE_FREE ();
1026 val = complement_process_encoding_system (val);
1029 int count1 = SPECPDL_INDEX ();
1031 specbind (intern ("coding-system-for-write"), val);
1032 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1033 happen to get a ".Z" suffix. */
1034 specbind (intern ("file-name-handler-alist"), Qnil);
1035 Fwrite_region (start, end, filename_string, Qnil, Qlambda, Qnil, Qnil);
1037 unbind_to (count1, Qnil);
1040 /* Note that Fcall_process takes care of binding
1041 coding-system-for-read. */
1043 record_unwind_protect (delete_temp_file, filename_string);
1045 if (nargs > 3 && !NILP (args[3]))
1046 Fdelete_region (start, end);
1048 if (nargs > 3)
1050 args += 2;
1051 nargs -= 2;
1053 else
1055 args[0] = args[2];
1056 nargs = 2;
1058 args[1] = filename_string;
1060 RETURN_UNGCPRO (unbind_to (count, Fcall_process (nargs, args)));
1063 #ifndef WINDOWSNT
1064 static int relocate_fd (int fd, int minfd);
1065 #endif
1067 static char **
1068 add_env (char **env, char **new_env, char *string)
1070 char **ep;
1071 int ok = 1;
1072 if (string == NULL)
1073 return new_env;
1075 /* See if this string duplicates any string already in the env.
1076 If so, don't put it in.
1077 When an env var has multiple definitions,
1078 we keep the definition that comes first in process-environment. */
1079 for (ep = env; ok && ep != new_env; ep++)
1081 char *p = *ep, *q = string;
1082 while (ok)
1084 if (*q != *p)
1085 break;
1086 if (*q == 0)
1087 /* The string is a lone variable name; keep it for now, we
1088 will remove it later. It is a placeholder for a
1089 variable that is not to be included in the environment. */
1090 break;
1091 if (*q == '=')
1092 ok = 0;
1093 p++, q++;
1096 if (ok)
1097 *new_env++ = string;
1098 return new_env;
1101 /* This is the last thing run in a newly forked inferior
1102 either synchronous or asynchronous.
1103 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1104 Initialize inferior's priority, pgrp, connected dir and environment.
1105 then exec another program based on new_argv.
1107 This function may change environ for the superior process.
1108 Therefore, the superior process must save and restore the value
1109 of environ around the vfork and the call to this function.
1111 SET_PGRP is nonzero if we should put the subprocess into a separate
1112 process group.
1114 CURRENT_DIR is an elisp string giving the path of the current
1115 directory the subprocess should have. Since we can't really signal
1116 a decent error from within the child, this should be verified as an
1117 executable directory by the parent. */
1120 child_setup (int in, int out, int err, register char **new_argv, int set_pgrp, Lisp_Object current_dir)
1122 char **env;
1123 char *pwd_var;
1124 #ifdef WINDOWSNT
1125 int cpid;
1126 HANDLE handles[3];
1127 #endif /* WINDOWSNT */
1129 int pid = getpid ();
1131 /* Close Emacs's descriptors that this process should not have. */
1132 close_process_descs ();
1134 /* DOS_NT isn't in a vfork, so if we are in the middle of load-file,
1135 we will lose if we call close_load_descs here. */
1136 #ifndef DOS_NT
1137 close_load_descs ();
1138 #endif
1140 /* Note that use of alloca is always safe here. It's obvious for systems
1141 that do not have true vfork or that have true (stack) alloca.
1142 If using vfork and C_ALLOCA (when Emacs used to include
1143 src/alloca.c) it is safe because that changes the superior's
1144 static variables as if the superior had done alloca and will be
1145 cleaned up in the usual way. */
1147 register char *temp;
1148 register int i;
1150 i = SBYTES (current_dir);
1151 #ifdef MSDOS
1152 /* MSDOS must have all environment variables malloc'ed, because
1153 low-level libc functions that launch subsidiary processes rely
1154 on that. */
1155 pwd_var = (char *) xmalloc (i + 6);
1156 #else
1157 pwd_var = (char *) alloca (i + 6);
1158 #endif
1159 temp = pwd_var + 4;
1160 memcpy (pwd_var, "PWD=", 4);
1161 memcpy (temp, SDATA (current_dir), i);
1162 if (!IS_DIRECTORY_SEP (temp[i - 1])) temp[i++] = DIRECTORY_SEP;
1163 temp[i] = 0;
1165 #ifndef DOS_NT
1166 /* We can't signal an Elisp error here; we're in a vfork. Since
1167 the callers check the current directory before forking, this
1168 should only return an error if the directory's permissions
1169 are changed between the check and this chdir, but we should
1170 at least check. */
1171 if (chdir (temp) < 0)
1172 _exit (errno);
1173 #else /* DOS_NT */
1174 /* Get past the drive letter, so that d:/ is left alone. */
1175 if (i > 2 && IS_DEVICE_SEP (temp[1]) && IS_DIRECTORY_SEP (temp[2]))
1177 temp += 2;
1178 i -= 2;
1180 #endif /* DOS_NT */
1182 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1183 while (i > 2 && IS_DIRECTORY_SEP (temp[i - 1]))
1184 temp[--i] = 0;
1187 /* Set `env' to a vector of the strings in the environment. */
1189 register Lisp_Object tem;
1190 register char **new_env;
1191 char **p, **q;
1192 register int new_length;
1193 Lisp_Object display = Qnil;
1195 new_length = 0;
1197 for (tem = Vprocess_environment;
1198 CONSP (tem) && STRINGP (XCAR (tem));
1199 tem = XCDR (tem))
1201 if (strncmp (SSDATA (XCAR (tem)), "DISPLAY", 7) == 0
1202 && (SDATA (XCAR (tem)) [7] == '\0'
1203 || SDATA (XCAR (tem)) [7] == '='))
1204 /* DISPLAY is specified in process-environment. */
1205 display = Qt;
1206 new_length++;
1209 /* If not provided yet, use the frame's DISPLAY. */
1210 if (NILP (display))
1212 Lisp_Object tmp = Fframe_parameter (selected_frame, Qdisplay);
1213 if (!STRINGP (tmp) && CONSP (Vinitial_environment))
1214 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1215 tmp = Fgetenv_internal (build_string ("DISPLAY"),
1216 Vinitial_environment);
1217 if (STRINGP (tmp))
1219 display = tmp;
1220 new_length++;
1224 /* new_length + 2 to include PWD and terminating 0. */
1225 env = new_env = (char **) alloca ((new_length + 2) * sizeof (char *));
1226 /* If we have a PWD envvar, pass one down,
1227 but with corrected value. */
1228 if (egetenv ("PWD"))
1229 *new_env++ = pwd_var;
1231 if (STRINGP (display))
1233 char *vdata = (char *) alloca (sizeof "DISPLAY=" + SBYTES (display));
1234 strcpy (vdata, "DISPLAY=");
1235 strcat (vdata, SSDATA (display));
1236 new_env = add_env (env, new_env, vdata);
1239 /* Overrides. */
1240 for (tem = Vprocess_environment;
1241 CONSP (tem) && STRINGP (XCAR (tem));
1242 tem = XCDR (tem))
1243 new_env = add_env (env, new_env, SSDATA (XCAR (tem)));
1245 *new_env = 0;
1247 /* Remove variable names without values. */
1248 p = q = env;
1249 while (*p != 0)
1251 while (*q != 0 && strchr (*q, '=') == NULL)
1252 q++;
1253 *p = *q++;
1254 if (*p != 0)
1255 p++;
1260 #ifdef WINDOWSNT
1261 prepare_standard_handles (in, out, err, handles);
1262 set_process_dir (SDATA (current_dir));
1263 /* Spawn the child. (See ntproc.c:Spawnve). */
1264 cpid = spawnve (_P_NOWAIT, new_argv[0], new_argv, env);
1265 reset_standard_handles (in, out, err, handles);
1266 if (cpid == -1)
1267 /* An error occurred while trying to spawn the process. */
1268 report_file_error ("Spawning child process", Qnil);
1269 return cpid;
1271 #else /* not WINDOWSNT */
1272 /* Make sure that in, out, and err are not actually already in
1273 descriptors zero, one, or two; this could happen if Emacs is
1274 started with its standard in, out, or error closed, as might
1275 happen under X. */
1277 int oin = in, oout = out;
1279 /* We have to avoid relocating the same descriptor twice! */
1281 in = relocate_fd (in, 3);
1283 if (out == oin)
1284 out = in;
1285 else
1286 out = relocate_fd (out, 3);
1288 if (err == oin)
1289 err = in;
1290 else if (err == oout)
1291 err = out;
1292 else
1293 err = relocate_fd (err, 3);
1296 #ifndef MSDOS
1297 emacs_close (0);
1298 emacs_close (1);
1299 emacs_close (2);
1301 dup2 (in, 0);
1302 dup2 (out, 1);
1303 dup2 (err, 2);
1304 emacs_close (in);
1305 if (out != in)
1306 emacs_close (out);
1307 if (err != in && err != out)
1308 emacs_close (err);
1310 #if defined(USG)
1311 #ifndef SETPGRP_RELEASES_CTTY
1312 setpgrp (); /* No arguments but equivalent in this case */
1313 #endif
1314 #else /* not USG */
1315 setpgrp (pid, pid);
1316 #endif /* not USG */
1318 /* setpgrp_of_tty is incorrect here; it uses input_fd. */
1319 tcsetpgrp (0, pid);
1321 /* execvp does not accept an environment arg so the only way
1322 to pass this environment is to set environ. Our caller
1323 is responsible for restoring the ambient value of environ. */
1324 environ = env;
1325 execvp (new_argv[0], new_argv);
1327 emacs_write (1, "Can't exec program: ", 20);
1328 emacs_write (1, new_argv[0], strlen (new_argv[0]));
1329 emacs_write (1, "\n", 1);
1330 _exit (1);
1332 #else /* MSDOS */
1333 pid = run_msdos_command (new_argv, pwd_var + 4, in, out, err, env);
1334 xfree (pwd_var);
1335 if (pid == -1)
1336 /* An error occurred while trying to run the subprocess. */
1337 report_file_error ("Spawning child process", Qnil);
1338 return pid;
1339 #endif /* MSDOS */
1340 #endif /* not WINDOWSNT */
1343 #ifndef WINDOWSNT
1344 /* Move the file descriptor FD so that its number is not less than MINFD.
1345 If the file descriptor is moved at all, the original is freed. */
1346 static int
1347 relocate_fd (int fd, int minfd)
1349 if (fd >= minfd)
1350 return fd;
1351 else
1353 int new;
1354 #ifdef F_DUPFD
1355 new = fcntl (fd, F_DUPFD, minfd);
1356 #else
1357 new = dup (fd);
1358 if (new != -1)
1359 /* Note that we hold the original FD open while we recurse,
1360 to guarantee we'll get a new FD if we need it. */
1361 new = relocate_fd (new, minfd);
1362 #endif
1363 if (new == -1)
1365 const char *message_1 = "Error while setting up child: ";
1366 const char *errmessage = strerror (errno);
1367 const char *message_2 = "\n";
1368 emacs_write (2, message_1, strlen (message_1));
1369 emacs_write (2, errmessage, strlen (errmessage));
1370 emacs_write (2, message_2, strlen (message_2));
1371 _exit (1);
1373 emacs_close (fd);
1374 return new;
1377 #endif /* not WINDOWSNT */
1379 static int
1380 getenv_internal_1 (const char *var, ptrdiff_t varlen, char **value,
1381 ptrdiff_t *valuelen, Lisp_Object env)
1383 for (; CONSP (env); env = XCDR (env))
1385 Lisp_Object entry = XCAR (env);
1386 if (STRINGP (entry)
1387 && SBYTES (entry) >= varlen
1388 #ifdef WINDOWSNT
1389 /* NT environment variables are case insensitive. */
1390 && ! strnicmp (SDATA (entry), var, varlen)
1391 #else /* not WINDOWSNT */
1392 && ! memcmp (SDATA (entry), var, varlen)
1393 #endif /* not WINDOWSNT */
1396 if (SBYTES (entry) > varlen && SREF (entry, varlen) == '=')
1398 *value = SSDATA (entry) + (varlen + 1);
1399 *valuelen = SBYTES (entry) - (varlen + 1);
1400 return 1;
1402 else if (SBYTES (entry) == varlen)
1404 /* Lone variable names in Vprocess_environment mean that
1405 variable should be removed from the environment. */
1406 *value = NULL;
1407 return 1;
1411 return 0;
1414 static int
1415 getenv_internal (const char *var, ptrdiff_t varlen, char **value,
1416 ptrdiff_t *valuelen, Lisp_Object frame)
1418 /* Try to find VAR in Vprocess_environment first. */
1419 if (getenv_internal_1 (var, varlen, value, valuelen,
1420 Vprocess_environment))
1421 return *value ? 1 : 0;
1423 /* For DISPLAY try to get the values from the frame or the initial env. */
1424 if (strcmp (var, "DISPLAY") == 0)
1426 Lisp_Object display
1427 = Fframe_parameter (NILP (frame) ? selected_frame : frame, Qdisplay);
1428 if (STRINGP (display))
1430 *value = SSDATA (display);
1431 *valuelen = SBYTES (display);
1432 return 1;
1434 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1435 if (getenv_internal_1 (var, varlen, value, valuelen,
1436 Vinitial_environment))
1437 return *value ? 1 : 0;
1440 return 0;
1443 DEFUN ("getenv-internal", Fgetenv_internal, Sgetenv_internal, 1, 2, 0,
1444 doc: /* Get the value of environment variable VARIABLE.
1445 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1446 the environment. Otherwise, value is a string.
1448 This function searches `process-environment' for VARIABLE.
1450 If optional parameter ENV is a list, then search this list instead of
1451 `process-environment', and return t when encountering a negative entry
1452 \(an entry for a variable with no value). */)
1453 (Lisp_Object variable, Lisp_Object env)
1455 char *value;
1456 ptrdiff_t valuelen;
1458 CHECK_STRING (variable);
1459 if (CONSP (env))
1461 if (getenv_internal_1 (SSDATA (variable), SBYTES (variable),
1462 &value, &valuelen, env))
1463 return value ? make_string (value, valuelen) : Qt;
1464 else
1465 return Qnil;
1467 else if (getenv_internal (SSDATA (variable), SBYTES (variable),
1468 &value, &valuelen, env))
1469 return make_string (value, valuelen);
1470 else
1471 return Qnil;
1474 /* A version of getenv that consults the Lisp environment lists,
1475 easily callable from C. */
1476 char *
1477 egetenv (const char *var)
1479 char *value;
1480 ptrdiff_t valuelen;
1482 if (getenv_internal (var, strlen (var), &value, &valuelen, Qnil))
1483 return value;
1484 else
1485 return 0;
1489 /* This is run before init_cmdargs. */
1491 void
1492 init_callproc_1 (void)
1494 char *data_dir = egetenv ("EMACSDATA");
1495 char *doc_dir = egetenv ("EMACSDOC");
1497 Vdata_directory
1498 = Ffile_name_as_directory (build_string (data_dir ? data_dir
1499 : PATH_DATA));
1500 Vdoc_directory
1501 = Ffile_name_as_directory (build_string (doc_dir ? doc_dir
1502 : PATH_DOC));
1504 /* Check the EMACSPATH environment variable, defaulting to the
1505 PATH_EXEC path from epaths.h. */
1506 Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC);
1507 Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path));
1508 Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
1511 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1513 void
1514 init_callproc (void)
1516 char *data_dir = egetenv ("EMACSDATA");
1518 register char * sh;
1519 Lisp_Object tempdir;
1521 if (!NILP (Vinstallation_directory))
1523 /* Add to the path the lib-src subdir of the installation dir. */
1524 Lisp_Object tem;
1525 tem = Fexpand_file_name (build_string ("lib-src"),
1526 Vinstallation_directory);
1527 #ifndef DOS_NT
1528 /* MSDOS uses wrapped binaries, so don't do this. */
1529 if (NILP (Fmember (tem, Vexec_path)))
1531 Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC);
1532 Vexec_path = Fcons (tem, Vexec_path);
1533 Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
1536 Vexec_directory = Ffile_name_as_directory (tem);
1537 #endif /* not DOS_NT */
1539 /* Maybe use ../etc as well as ../lib-src. */
1540 if (data_dir == 0)
1542 tem = Fexpand_file_name (build_string ("etc"),
1543 Vinstallation_directory);
1544 Vdoc_directory = Ffile_name_as_directory (tem);
1548 /* Look for the files that should be in etc. We don't use
1549 Vinstallation_directory, because these files are never installed
1550 near the executable, and they are never in the build
1551 directory when that's different from the source directory.
1553 Instead, if these files are not in the nominal place, we try the
1554 source directory. */
1555 if (data_dir == 0)
1557 Lisp_Object tem, tem1, srcdir;
1559 srcdir = Fexpand_file_name (build_string ("../src/"),
1560 build_string (PATH_DUMPLOADSEARCH));
1561 tem = Fexpand_file_name (build_string ("GNU"), Vdata_directory);
1562 tem1 = Ffile_exists_p (tem);
1563 if (!NILP (Fequal (srcdir, Vinvocation_directory)) || NILP (tem1))
1565 Lisp_Object newdir;
1566 newdir = Fexpand_file_name (build_string ("../etc/"),
1567 build_string (PATH_DUMPLOADSEARCH));
1568 tem = Fexpand_file_name (build_string ("GNU"), newdir);
1569 tem1 = Ffile_exists_p (tem);
1570 if (!NILP (tem1))
1571 Vdata_directory = newdir;
1575 #ifndef CANNOT_DUMP
1576 if (initialized)
1577 #endif
1579 tempdir = Fdirectory_file_name (Vexec_directory);
1580 if (access (SSDATA (tempdir), 0) < 0)
1581 dir_warning ("Warning: arch-dependent data dir (%s) does not exist.\n",
1582 Vexec_directory);
1585 tempdir = Fdirectory_file_name (Vdata_directory);
1586 if (access (SSDATA (tempdir), 0) < 0)
1587 dir_warning ("Warning: arch-independent data dir (%s) does not exist.\n",
1588 Vdata_directory);
1590 sh = (char *) getenv ("SHELL");
1591 Vshell_file_name = build_string (sh ? sh : "/bin/sh");
1593 #ifdef DOS_NT
1594 Vshared_game_score_directory = Qnil;
1595 #else
1596 Vshared_game_score_directory = build_string (PATH_GAME);
1597 if (NILP (Ffile_directory_p (Vshared_game_score_directory)))
1598 Vshared_game_score_directory = Qnil;
1599 #endif
1602 void
1603 set_initial_environment (void)
1605 char **envp;
1606 for (envp = environ; *envp; envp++)
1607 Vprocess_environment = Fcons (build_string (*envp),
1608 Vprocess_environment);
1609 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1610 to use `delete' and friends on process-environment. */
1611 Vinitial_environment = Fcopy_sequence (Vprocess_environment);
1614 void
1615 syms_of_callproc (void)
1617 #ifndef DOS_NT
1618 Vtemp_file_name_pattern = build_string ("emacsXXXXXX");
1619 #elif defined (WINDOWSNT)
1620 Vtemp_file_name_pattern = build_string ("emXXXXXX");
1621 #else
1622 Vtemp_file_name_pattern = build_string ("detmp.XXX");
1623 #endif
1624 staticpro (&Vtemp_file_name_pattern);
1626 DEFVAR_LISP ("shell-file-name", Vshell_file_name,
1627 doc: /* *File name to load inferior shells from.
1628 Initialized from the SHELL environment variable, or to a system-dependent
1629 default if SHELL is not set. */);
1631 DEFVAR_LISP ("exec-path", Vexec_path,
1632 doc: /* *List of directories to search programs to run in subprocesses.
1633 Each element is a string (directory name) or nil (try default directory). */);
1635 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes,
1636 doc: /* *List of suffixes to try to find executable file names.
1637 Each element is a string. */);
1638 Vexec_suffixes = Qnil;
1640 DEFVAR_LISP ("exec-directory", Vexec_directory,
1641 doc: /* Directory for executables for Emacs to invoke.
1642 More generally, this includes any architecture-dependent files
1643 that are built and installed from the Emacs distribution. */);
1645 DEFVAR_LISP ("data-directory", Vdata_directory,
1646 doc: /* Directory of machine-independent files that come with GNU Emacs.
1647 These are files intended for Emacs to use while it runs. */);
1649 DEFVAR_LISP ("doc-directory", Vdoc_directory,
1650 doc: /* Directory containing the DOC file that comes with GNU Emacs.
1651 This is usually the same as `data-directory'. */);
1653 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory,
1654 doc: /* For internal use by the build procedure only.
1655 This is the name of the directory in which the build procedure installed
1656 Emacs's info files; the default value for `Info-default-directory-list'
1657 includes this. */);
1658 Vconfigure_info_directory = build_string (PATH_INFO);
1660 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory,
1661 doc: /* Directory of score files for games which come with GNU Emacs.
1662 If this variable is nil, then Emacs is unable to use a shared directory. */);
1663 #ifdef DOS_NT
1664 Vshared_game_score_directory = Qnil;
1665 #else
1666 Vshared_game_score_directory = build_string (PATH_GAME);
1667 #endif
1669 DEFVAR_LISP ("initial-environment", Vinitial_environment,
1670 doc: /* List of environment variables inherited from the parent process.
1671 Each element should be a string of the form ENVVARNAME=VALUE.
1672 The elements must normally be decoded (using `locale-coding-system') for use. */);
1673 Vinitial_environment = Qnil;
1675 DEFVAR_LISP ("process-environment", Vprocess_environment,
1676 doc: /* List of overridden environment variables for subprocesses to inherit.
1677 Each element should be a string of the form ENVVARNAME=VALUE.
1679 Entries in this list take precedence to those in the frame-local
1680 environments. Therefore, let-binding `process-environment' is an easy
1681 way to temporarily change the value of an environment variable,
1682 irrespective of where it comes from. To use `process-environment' to
1683 remove an environment variable, include only its name in the list,
1684 without "=VALUE".
1686 This variable is set to nil when Emacs starts.
1688 If multiple entries define the same variable, the first one always
1689 takes precedence.
1691 Non-ASCII characters are encoded according to the initial value of
1692 `locale-coding-system', i.e. the elements must normally be decoded for
1693 use.
1695 See `setenv' and `getenv'. */);
1696 Vprocess_environment = Qnil;
1698 defsubr (&Scall_process);
1699 defsubr (&Sgetenv_internal);
1700 defsubr (&Scall_process_region);