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80856e74 | 1 | /* Synchronous subprocess invocation for GNU Emacs. |
91bac16a | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1992 Free Software Foundation, Inc. |
80856e74 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include <signal.h> | |
77d78be1 | 22 | #include <errno.h> |
80856e74 JB |
23 | |
24 | #include "config.h" | |
25 | ||
26 | /* Define SIGCHLD as an alias for SIGCLD. */ | |
27 | ||
28 | #if !defined (SIGCHLD) && defined (SIGCLD) | |
29 | #define SIGCHLD SIGCLD | |
30 | #endif /* SIGCLD */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #define PRIO_PROCESS 0 | |
34 | #include <sys/file.h> | |
35 | #ifdef USG5 | |
36 | #include <fcntl.h> | |
37 | #endif | |
38 | ||
39 | #ifndef O_RDONLY | |
40 | #define O_RDONLY 0 | |
41 | #endif | |
42 | ||
43 | #ifndef O_WRONLY | |
44 | #define O_WRONLY 1 | |
45 | #endif | |
46 | ||
47 | #include "lisp.h" | |
48 | #include "commands.h" | |
49 | #include "buffer.h" | |
50 | #include "paths.h" | |
51 | #include "process.h" | |
52 | ||
53 | #ifdef VMS | |
54 | extern noshare char **environ; | |
55 | #else | |
56 | extern char **environ; | |
57 | #endif | |
58 | ||
59 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
60 | ||
9453ea7b | 61 | Lisp_Object Vexec_path, Vexec_directory, Vdata_directory; |
80856e74 JB |
62 | |
63 | Lisp_Object Vshell_file_name; | |
64 | ||
80856e74 | 65 | Lisp_Object Vprocess_environment; |
80856e74 JB |
66 | |
67 | /* True iff we are about to fork off a synchronous process or if we | |
68 | are waiting for it. */ | |
69 | int synch_process_alive; | |
70 | ||
71 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ | |
72 | char *synch_process_death; | |
73 | ||
74 | /* If synch_process_death is zero, | |
75 | this is exit code of synchronous subprocess. */ | |
76 | int synch_process_retcode; | |
77 | \f | |
78 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
79 | ||
80 | Lisp_Object | |
81 | call_process_cleanup (fdpid) | |
82 | Lisp_Object fdpid; | |
83 | { | |
84 | register Lisp_Object fd, pid; | |
85 | fd = Fcar (fdpid); | |
86 | pid = Fcdr (fdpid); | |
87 | close (XFASTINT (fd)); | |
88 | kill (XFASTINT (pid), SIGKILL); | |
89 | synch_process_alive = 0; | |
90 | return Qnil; | |
91 | } | |
92 | ||
93 | DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0, | |
94 | "Call PROGRAM synchronously in separate process.\n\ | |
95 | The program's input comes from file INFILE (nil means `/dev/null').\n\ | |
96 | Insert output in BUFFER before point; t means current buffer;\n\ | |
97 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
98 | Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
99 | Remaining arguments are strings passed as command arguments to PROGRAM.\n\ | |
100 | If BUFFER is nil or 0, returns immediately with value nil.\n\ | |
101 | Otherwise waits for PROGRAM to terminate\n\ | |
4a095293 | 102 | and returns a numeric exit status or a signal description string.\n\ |
80856e74 JB |
103 | If you quit, the process is killed with SIGKILL.") |
104 | (nargs, args) | |
105 | int nargs; | |
106 | register Lisp_Object *args; | |
107 | { | |
77d78be1 | 108 | Lisp_Object display, infile, buffer, path, current_dir; |
80856e74 JB |
109 | int fd[2]; |
110 | int filefd; | |
111 | register int pid; | |
112 | char buf[1024]; | |
113 | int count = specpdl_ptr - specpdl; | |
114 | register unsigned char **new_argv | |
115 | = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *)); | |
116 | struct buffer *old = current_buffer; | |
117 | #if 0 | |
118 | int mask; | |
119 | #endif | |
80856e74 JB |
120 | CHECK_STRING (args[0], 0); |
121 | ||
77d78be1 JB |
122 | if (nargs >= 2 && ! NILP (args[1])) |
123 | { | |
124 | infile = Fexpand_file_name (args[1], current_buffer->directory); | |
125 | CHECK_STRING (infile, 1); | |
126 | } | |
80856e74 | 127 | else |
ffd56f97 JB |
128 | #ifdef VMS |
129 | infile = build_string ("NLA0:"); | |
130 | #else | |
77d78be1 | 131 | infile = build_string ("/dev/null"); |
ffd56f97 | 132 | #endif /* not VMS */ |
80856e74 | 133 | |
ffd56f97 JB |
134 | if (nargs >= 3) |
135 | { | |
136 | register Lisp_Object tem; | |
137 | ||
138 | buffer = tem = args[2]; | |
139 | if (!(EQ (tem, Qnil) | |
140 | || EQ (tem, Qt) | |
141 | || XFASTINT (tem) == 0)) | |
142 | { | |
143 | buffer = Fget_buffer (tem); | |
144 | CHECK_BUFFER (buffer, 2); | |
145 | } | |
146 | } | |
147 | else | |
148 | buffer = Qnil; | |
80856e74 | 149 | |
ffd56f97 | 150 | display = nargs >= 4 ? args[3] : Qnil; |
80856e74 JB |
151 | |
152 | { | |
153 | register int i; | |
154 | for (i = 4; i < nargs; i++) | |
155 | { | |
156 | CHECK_STRING (args[i], i); | |
157 | new_argv[i - 3] = XSTRING (args[i])->data; | |
158 | } | |
159 | /* Program name is first command arg */ | |
160 | new_argv[0] = XSTRING (args[0])->data; | |
161 | new_argv[i - 3] = 0; | |
162 | } | |
163 | ||
77d78be1 | 164 | filefd = open (XSTRING (infile)->data, O_RDONLY, 0); |
80856e74 JB |
165 | if (filefd < 0) |
166 | { | |
77d78be1 | 167 | report_file_error ("Opening process input file", Fcons (infile, Qnil)); |
80856e74 JB |
168 | } |
169 | /* Search for program; barf if not found. */ | |
170 | openp (Vexec_path, args[0], "", &path, 1); | |
efb859b4 | 171 | if (NILP (path)) |
80856e74 JB |
172 | { |
173 | close (filefd); | |
174 | report_file_error ("Searching for program", Fcons (args[0], Qnil)); | |
175 | } | |
176 | new_argv[0] = XSTRING (path)->data; | |
177 | ||
178 | if (XTYPE (buffer) == Lisp_Int) | |
179 | fd[1] = open ("/dev/null", O_WRONLY), fd[0] = -1; | |
180 | else | |
181 | { | |
182 | pipe (fd); | |
183 | #if 0 | |
184 | /* Replaced by close_process_descs */ | |
185 | set_exclusive_use (fd[0]); | |
186 | #endif | |
187 | } | |
188 | ||
77d78be1 JB |
189 | /* Make sure that the child will be able to chdir to the current |
190 | buffer's current directory. We can't just have the child check | |
191 | for an error when it does the chdir, since it's in a vfork. */ | |
192 | current_dir = expand_and_dir_to_file (current_buffer->directory, Qnil); | |
193 | if (NILP (Ffile_accessible_directory_p (current_dir))) | |
194 | report_file_error ("Setting current directory", | |
195 | Fcons (current_buffer->directory, Qnil)); | |
196 | ||
80856e74 JB |
197 | { |
198 | /* child_setup must clobber environ in systems with true vfork. | |
199 | Protect it from permanent change. */ | |
200 | register char **save_environ = environ; | |
201 | register int fd1 = fd[1]; | |
80856e74 JB |
202 | |
203 | #if 0 /* Some systems don't have sigblock. */ | |
e065a56e | 204 | mask = sigblock (sigmask (SIGCHLD)); |
80856e74 JB |
205 | #endif |
206 | ||
207 | /* Record that we're about to create a synchronous process. */ | |
208 | synch_process_alive = 1; | |
209 | ||
210 | pid = vfork (); | |
211 | ||
212 | if (pid == 0) | |
213 | { | |
214 | if (fd[0] >= 0) | |
215 | close (fd[0]); | |
216 | #ifdef USG | |
217 | setpgrp (); | |
218 | #else | |
219 | setpgrp (pid, pid); | |
220 | #endif /* USG */ | |
e065a56e | 221 | child_setup (filefd, fd1, fd1, new_argv, 0, current_dir); |
80856e74 JB |
222 | } |
223 | ||
224 | #if 0 | |
225 | /* Tell SIGCHLD handler to look for this pid. */ | |
226 | synch_process_pid = pid; | |
227 | /* Now let SIGCHLD come through. */ | |
e065a56e | 228 | sigsetmask (mask); |
80856e74 JB |
229 | #endif |
230 | ||
231 | environ = save_environ; | |
232 | ||
233 | close (filefd); | |
234 | close (fd1); | |
235 | } | |
236 | ||
237 | if (pid < 0) | |
238 | { | |
239 | close (fd[0]); | |
240 | report_file_error ("Doing vfork", Qnil); | |
241 | } | |
242 | ||
243 | if (XTYPE (buffer) == Lisp_Int) | |
244 | { | |
245 | #ifndef subprocesses | |
8cf9a8c6 JB |
246 | /* If Emacs has been built with asynchronous subprocess support, |
247 | we don't need to do this, I think because it will then have | |
248 | the facilities for handling SIGCHLD. */ | |
80856e74 JB |
249 | wait_without_blocking (); |
250 | #endif /* subprocesses */ | |
80856e74 JB |
251 | return Qnil; |
252 | } | |
253 | ||
b5752bd1 JB |
254 | synch_process_death = 0; |
255 | synch_process_retcode = 0; | |
256 | ||
80856e74 JB |
257 | record_unwind_protect (call_process_cleanup, |
258 | Fcons (make_number (fd[0]), make_number (pid))); | |
259 | ||
260 | ||
261 | if (XTYPE (buffer) == Lisp_Buffer) | |
262 | Fset_buffer (buffer); | |
263 | ||
264 | immediate_quit = 1; | |
265 | QUIT; | |
266 | ||
267 | { | |
268 | register int nread; | |
269 | ||
270 | while ((nread = read (fd[0], buf, sizeof buf)) > 0) | |
271 | { | |
272 | immediate_quit = 0; | |
efb859b4 | 273 | if (!NILP (buffer)) |
80856e74 | 274 | insert (buf, nread); |
efb859b4 | 275 | if (!NILP (display) && INTERACTIVE) |
80856e74 JB |
276 | redisplay_preserve_echo_area (); |
277 | immediate_quit = 1; | |
278 | QUIT; | |
279 | } | |
280 | } | |
281 | ||
282 | /* Wait for it to terminate, unless it already has. */ | |
283 | wait_for_termination (pid); | |
284 | ||
285 | immediate_quit = 0; | |
286 | ||
287 | set_buffer_internal (old); | |
288 | ||
289 | unbind_to (count, Qnil); | |
290 | ||
80856e74 JB |
291 | if (synch_process_death) |
292 | return build_string (synch_process_death); | |
293 | return make_number (synch_process_retcode); | |
294 | } | |
295 | #endif | |
296 | \f | |
297 | static void | |
298 | delete_temp_file (name) | |
299 | Lisp_Object name; | |
300 | { | |
301 | unlink (XSTRING (name)->data); | |
302 | } | |
303 | ||
304 | DEFUN ("call-process-region", Fcall_process_region, Scall_process_region, | |
305 | 3, MANY, 0, | |
306 | "Send text from START to END to a synchronous process running PROGRAM.\n\ | |
307 | Delete the text if fourth arg DELETE is non-nil.\n\ | |
308 | Insert output in BUFFER before point; t means current buffer;\n\ | |
309 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
310 | Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
311 | Remaining args are passed to PROGRAM at startup as command args.\n\ | |
312 | If BUFFER is nil, returns immediately with value nil.\n\ | |
313 | Otherwise waits for PROGRAM to terminate\n\ | |
4a095293 | 314 | and returns a numeric exit status or a signal description string.\n\ |
80856e74 JB |
315 | If you quit, the process is killed with SIGKILL.") |
316 | (nargs, args) | |
317 | int nargs; | |
318 | register Lisp_Object *args; | |
319 | { | |
320 | register Lisp_Object filename_string, start, end; | |
321 | char tempfile[20]; | |
322 | int count = specpdl_ptr - specpdl; | |
80856e74 JB |
323 | |
324 | #ifdef VMS | |
325 | strcpy (tempfile, "tmp:emacsXXXXXX."); | |
326 | #else | |
327 | strcpy (tempfile, "/tmp/emacsXXXXXX"); | |
328 | #endif | |
329 | mktemp (tempfile); | |
330 | ||
331 | filename_string = build_string (tempfile); | |
332 | start = args[0]; | |
333 | end = args[1]; | |
334 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); | |
335 | record_unwind_protect (delete_temp_file, filename_string); | |
336 | ||
efb859b4 | 337 | if (!NILP (args[3])) |
80856e74 JB |
338 | Fdelete_region (start, end); |
339 | ||
340 | args[3] = filename_string; | |
341 | Fcall_process (nargs - 2, args + 2); | |
342 | ||
80856e74 JB |
343 | return unbind_to (count, Qnil); |
344 | } | |
345 | \f | |
346 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
347 | ||
348 | /* This is the last thing run in a newly forked inferior | |
349 | either synchronous or asynchronous. | |
350 | Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2. | |
351 | Initialize inferior's priority, pgrp, connected dir and environment. | |
352 | then exec another program based on new_argv. | |
353 | ||
354 | This function may change environ for the superior process. | |
355 | Therefore, the superior process must save and restore the value | |
356 | of environ around the vfork and the call to this function. | |
357 | ||
358 | ENV is the environment for the subprocess. | |
359 | ||
360 | SET_PGRP is nonzero if we should put the subprocess into a separate | |
77d78be1 JB |
361 | process group. |
362 | ||
363 | CURRENT_DIR is an elisp string giving the path of the current | |
364 | directory the subprocess should have. Since we can't really signal | |
365 | a decent error from within the child, this should be verified as an | |
366 | executable directory by the parent. */ | |
80856e74 | 367 | |
e065a56e | 368 | child_setup (in, out, err, new_argv, set_pgrp, current_dir) |
80856e74 JB |
369 | int in, out, err; |
370 | register char **new_argv; | |
80856e74 | 371 | int set_pgrp; |
77d78be1 | 372 | Lisp_Object current_dir; |
80856e74 | 373 | { |
e065a56e JB |
374 | char **env; |
375 | ||
80856e74 JB |
376 | register int pid = getpid(); |
377 | ||
378 | setpriority (PRIO_PROCESS, pid, 0); | |
379 | ||
380 | #ifdef subprocesses | |
381 | /* Close Emacs's descriptors that this process should not have. */ | |
382 | close_process_descs (); | |
383 | #endif | |
384 | ||
385 | /* Note that use of alloca is always safe here. It's obvious for systems | |
386 | that do not have true vfork or that have true (stack) alloca. | |
387 | If using vfork and C_ALLOCA it is safe because that changes | |
388 | the superior's static variables as if the superior had done alloca | |
389 | and will be cleaned up in the usual way. */ | |
77d78be1 JB |
390 | { |
391 | register unsigned char *temp; | |
392 | register int i; | |
393 | ||
394 | i = XSTRING (current_dir)->size; | |
395 | temp = (unsigned char *) alloca (i + 2); | |
396 | bcopy (XSTRING (current_dir)->data, temp, i); | |
397 | if (temp[i - 1] != '/') temp[i++] = '/'; | |
398 | temp[i] = 0; | |
399 | ||
400 | /* We can't signal an Elisp error here; we're in a vfork. Since | |
401 | the callers check the current directory before forking, this | |
402 | should only return an error if the directory's permissions | |
403 | are changed between the check and this chdir, but we should | |
404 | at least check. */ | |
405 | if (chdir (temp) < 0) | |
406 | exit (errno); | |
407 | } | |
80856e74 | 408 | |
80856e74 JB |
409 | /* Set `env' to a vector of the strings in Vprocess_environment. */ |
410 | { | |
411 | register Lisp_Object tem; | |
412 | register char **new_env; | |
413 | register int new_length; | |
414 | ||
415 | new_length = 0; | |
416 | for (tem = Vprocess_environment; | |
417 | (XTYPE (tem) == Lisp_Cons | |
418 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
419 | tem = XCONS (tem)->cdr) | |
420 | new_length++; | |
421 | ||
422 | /* new_length + 1 to include terminating 0 */ | |
423 | env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *)); | |
424 | ||
e065a56e | 425 | /* Copy the Vprocess_alist strings into new_env. */ |
80856e74 JB |
426 | for (tem = Vprocess_environment; |
427 | (XTYPE (tem) == Lisp_Cons | |
428 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
429 | tem = XCONS (tem)->cdr) | |
430 | *new_env++ = (char *) XSTRING (XCONS (tem)->car)->data; | |
431 | *new_env = 0; | |
432 | } | |
80856e74 JB |
433 | |
434 | close (0); | |
435 | close (1); | |
436 | close (2); | |
437 | ||
438 | dup2 (in, 0); | |
439 | dup2 (out, 1); | |
440 | dup2 (err, 2); | |
441 | close (in); | |
442 | close (out); | |
443 | close (err); | |
444 | ||
91bac16a JB |
445 | #ifdef USG |
446 | setpgrp (); /* No arguments but equivalent in this case */ | |
447 | #else | |
448 | setpgrp (pid, pid); | |
449 | #endif /* USG */ | |
80856e74 JB |
450 | setpgrp_of_tty (pid); |
451 | ||
452 | #ifdef vipc | |
453 | something missing here; | |
454 | #endif /* vipc */ | |
455 | ||
456 | /* execvp does not accept an environment arg so the only way | |
457 | to pass this environment is to set environ. Our caller | |
458 | is responsible for restoring the ambient value of environ. */ | |
459 | environ = env; | |
460 | execvp (new_argv[0], new_argv); | |
461 | ||
462 | write (1, "Couldn't exec the program ", 26); | |
463 | write (1, new_argv[0], strlen (new_argv[0])); | |
464 | _exit (1); | |
465 | } | |
466 | ||
efb859b4 JB |
467 | static int |
468 | getenv_internal (var, varlen, value, valuelen) | |
469 | char *var; | |
470 | int varlen; | |
471 | char **value; | |
77d78be1 | 472 | int *valuelen; |
efb859b4 JB |
473 | { |
474 | Lisp_Object scan; | |
475 | ||
476 | for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr) | |
477 | { | |
478 | Lisp_Object entry = XCONS (scan)->car; | |
479 | ||
480 | if (XTYPE (entry) == Lisp_String | |
481 | && XSTRING (entry)->size > varlen | |
482 | && XSTRING (entry)->data[varlen] == '=' | |
483 | && ! bcmp (XSTRING (entry)->data, var, varlen)) | |
484 | { | |
77d78be1 | 485 | *value = (char *) XSTRING (entry)->data + (varlen + 1); |
efb859b4 JB |
486 | *valuelen = XSTRING (entry)->size - (varlen + 1); |
487 | return 1; | |
488 | } | |
489 | } | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, 0, | |
495 | "Return the value of environment variable VAR, as a string.\n\ | |
496 | VAR should be a string. Value is nil if VAR is undefined in the environment.\n\ | |
497 | This function consults the variable ``process-environment'' for its value.") | |
498 | (var) | |
499 | Lisp_Object var; | |
500 | { | |
501 | char *value; | |
502 | int valuelen; | |
503 | ||
504 | CHECK_STRING (var, 0); | |
505 | if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size, | |
506 | &value, &valuelen)) | |
507 | return make_string (value, valuelen); | |
508 | else | |
509 | return Qnil; | |
510 | } | |
511 | ||
512 | /* A version of getenv that consults process_environment, easily | |
513 | callable from C. */ | |
514 | char * | |
515 | egetenv (var) | |
4746118a | 516 | char *var; |
efb859b4 JB |
517 | { |
518 | char *value; | |
519 | int valuelen; | |
520 | ||
521 | if (getenv_internal (var, strlen (var), &value, &valuelen)) | |
522 | return value; | |
523 | else | |
524 | return 0; | |
525 | } | |
526 | ||
80856e74 JB |
527 | #endif /* not VMS */ |
528 | \f | |
529 | init_callproc () | |
530 | { | |
531 | register char * sh; | |
532 | register char **envp; | |
9453ea7b JB |
533 | Lisp_Object tempdir; |
534 | ||
32676c08 JB |
535 | { |
536 | char *data_dir = egetenv ("EMACSDATA"); | |
537 | ||
538 | Vdata_directory = | |
539 | Ffile_name_as_directory | |
540 | (build_string (data_dir ? data_dir : PATH_DATA)); | |
541 | } | |
80856e74 | 542 | |
32676c08 JB |
543 | /* Check the EMACSPATH environment variable, defaulting to the |
544 | PATH_EXEC path from paths.h. */ | |
545 | Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC); | |
80856e74 JB |
546 | Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path)); |
547 | Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path); | |
548 | ||
9453ea7b JB |
549 | tempdir = Fdirectory_file_name (Vexec_directory); |
550 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
80856e74 | 551 | { |
9453ea7b | 552 | printf ("Warning: arch-dependent data dir (%s) does not exist.\n", |
80856e74 JB |
553 | XSTRING (Vexec_directory)->data); |
554 | sleep (2); | |
555 | } | |
556 | ||
9453ea7b JB |
557 | tempdir = Fdirectory_file_name (Vdata_directory); |
558 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
559 | { | |
560 | printf ("Warning: arch-independent data dir (%s) does not exist.\n", | |
561 | XSTRING (Vdata_directory)->data); | |
562 | sleep (2); | |
563 | } | |
564 | ||
80856e74 JB |
565 | #ifdef VMS |
566 | Vshell_file_name = build_string ("*dcl*"); | |
567 | #else | |
efb859b4 | 568 | sh = (char *) getenv ("SHELL"); |
80856e74 JB |
569 | Vshell_file_name = build_string (sh ? sh : "/bin/sh"); |
570 | #endif | |
571 | ||
80856e74 JB |
572 | Vprocess_environment = Qnil; |
573 | #ifndef CANNOT_DUMP | |
574 | if (initialized) | |
575 | #endif | |
576 | for (envp = environ; *envp; envp++) | |
577 | Vprocess_environment = Fcons (build_string (*envp), | |
578 | Vprocess_environment); | |
80856e74 JB |
579 | } |
580 | ||
581 | syms_of_callproc () | |
582 | { | |
583 | DEFVAR_LISP ("shell-file-name", &Vshell_file_name, | |
584 | "*File name to load inferior shells from.\n\ | |
585 | Initialized from the SHELL environment variable."); | |
586 | ||
587 | DEFVAR_LISP ("exec-path", &Vexec_path, | |
588 | "*List of directories to search programs to run in subprocesses.\n\ | |
589 | Each element is a string (directory name) or nil (try default directory)."); | |
590 | ||
591 | DEFVAR_LISP ("exec-directory", &Vexec_directory, | |
9453ea7b JB |
592 | "Directory of architecture-dependent files that come with GNU Emacs,\n\ |
593 | especially executable programs intended for Emacs to invoke."); | |
594 | ||
595 | DEFVAR_LISP ("data-directory", &Vdata_directory, | |
596 | "Directory of architecture-independent files that come with GNU Emacs,\n\ | |
597 | intended for Emacs to use."); | |
80856e74 | 598 | |
80856e74 | 599 | DEFVAR_LISP ("process-environment", &Vprocess_environment, |
efb859b4 JB |
600 | "List of environment variables for subprocesses to inherit.\n\ |
601 | Each element should be a string of the form ENVVARNAME=VALUE.\n\ | |
602 | The environment which Emacs inherits is placed in this variable\n\ | |
603 | when Emacs starts."); | |
80856e74 JB |
604 | |
605 | #ifndef VMS | |
606 | defsubr (&Scall_process); | |
607 | #endif | |
efb859b4 | 608 | defsubr (&Sgetenv); |
80856e74 JB |
609 | defsubr (&Scall_process_region); |
610 | } |