Commit | Line | Data |
---|---|---|
80856e74 | 1 | /* Synchronous subprocess invocation for GNU Emacs. |
e576cab4 | 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> | |
e576cab4 | 22 | #include <errno.h> |
80856e74 JB |
23 | |
24 | #include "config.h" | |
25 | ||
426b37ae JB |
26 | extern int errno; |
27 | #ifndef VMS | |
28 | extern char *sys_errlist[]; | |
29 | #endif | |
30 | ||
80856e74 JB |
31 | /* Define SIGCHLD as an alias for SIGCLD. */ |
32 | ||
33 | #if !defined (SIGCHLD) && defined (SIGCLD) | |
34 | #define SIGCHLD SIGCLD | |
35 | #endif /* SIGCLD */ | |
36 | ||
37 | #include <sys/types.h> | |
38 | #define PRIO_PROCESS 0 | |
39 | #include <sys/file.h> | |
40 | #ifdef USG5 | |
41 | #include <fcntl.h> | |
42 | #endif | |
43 | ||
44 | #ifndef O_RDONLY | |
45 | #define O_RDONLY 0 | |
46 | #endif | |
47 | ||
48 | #ifndef O_WRONLY | |
49 | #define O_WRONLY 1 | |
50 | #endif | |
51 | ||
52 | #include "lisp.h" | |
53 | #include "commands.h" | |
54 | #include "buffer.h" | |
55 | #include "paths.h" | |
56 | #include "process.h" | |
d177f194 | 57 | #include "syssignal.h" |
80856e74 JB |
58 | |
59 | #ifdef VMS | |
60 | extern noshare char **environ; | |
61 | #else | |
62 | extern char **environ; | |
63 | #endif | |
64 | ||
65 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
66 | ||
e576cab4 | 67 | Lisp_Object Vexec_path, Vexec_directory, Vdata_directory; |
80856e74 JB |
68 | |
69 | Lisp_Object Vshell_file_name; | |
70 | ||
80856e74 | 71 | Lisp_Object Vprocess_environment; |
80856e74 JB |
72 | |
73 | /* True iff we are about to fork off a synchronous process or if we | |
74 | are waiting for it. */ | |
75 | int synch_process_alive; | |
76 | ||
77 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ | |
78 | char *synch_process_death; | |
79 | ||
80 | /* If synch_process_death is zero, | |
81 | this is exit code of synchronous subprocess. */ | |
82 | int synch_process_retcode; | |
83 | \f | |
84 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
85 | ||
d177f194 JB |
86 | static Lisp_Object |
87 | call_process_kill (fdpid) | |
88 | Lisp_Object fdpid; | |
89 | { | |
90 | close (XFASTINT (Fcar (fdpid))); | |
91 | EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL); | |
92 | synch_process_alive = 0; | |
93 | return Qnil; | |
94 | } | |
95 | ||
80856e74 JB |
96 | Lisp_Object |
97 | call_process_cleanup (fdpid) | |
98 | Lisp_Object fdpid; | |
99 | { | |
d177f194 JB |
100 | register int pid = XFASTINT (Fcdr (fdpid)); |
101 | ||
102 | if (EMACS_KILLPG (pid, SIGINT) == 0) | |
103 | { | |
104 | int count = specpdl_ptr - specpdl; | |
105 | record_unwind_protect (call_process_kill, fdpid); | |
106 | message1 ("Waiting for process to die...(type C-g again to kill it instantly)"); | |
107 | immediate_quit = 1; | |
108 | QUIT; | |
109 | wait_for_termination (pid); | |
110 | immediate_quit = 0; | |
111 | specpdl_ptr = specpdl + count; /* Discard the unwind protect. */ | |
112 | message1 ("Waiting for process to die...done"); | |
113 | } | |
80856e74 | 114 | synch_process_alive = 0; |
d177f194 | 115 | close (XFASTINT (Fcar (fdpid))); |
80856e74 JB |
116 | return Qnil; |
117 | } | |
118 | ||
119 | DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0, | |
120 | "Call PROGRAM synchronously in separate process.\n\ | |
121 | The program's input comes from file INFILE (nil means `/dev/null').\n\ | |
122 | Insert output in BUFFER before point; t means current buffer;\n\ | |
123 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
124 | Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
125 | Remaining arguments are strings passed as command arguments to PROGRAM.\n\ | |
e576cab4 | 126 | If BUFFER is 0, returns immediately with value nil.\n\ |
80856e74 | 127 | Otherwise waits for PROGRAM to terminate\n\ |
e576cab4 | 128 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 129 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
130 | (nargs, args) |
131 | int nargs; | |
132 | register Lisp_Object *args; | |
133 | { | |
58616e67 | 134 | Lisp_Object infile, buffer, current_dir, display, path; |
80856e74 JB |
135 | int fd[2]; |
136 | int filefd; | |
137 | register int pid; | |
138 | char buf[1024]; | |
139 | int count = specpdl_ptr - specpdl; | |
140 | register unsigned char **new_argv | |
141 | = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *)); | |
142 | struct buffer *old = current_buffer; | |
143 | #if 0 | |
144 | int mask; | |
145 | #endif | |
80856e74 JB |
146 | CHECK_STRING (args[0], 0); |
147 | ||
e576cab4 JB |
148 | if (nargs >= 2 && ! NILP (args[1])) |
149 | { | |
150 | infile = Fexpand_file_name (args[1], current_buffer->directory); | |
151 | CHECK_STRING (infile, 1); | |
152 | } | |
80856e74 | 153 | else |
5437e9f9 | 154 | infile = build_string (NULL_DEVICE); |
80856e74 | 155 | |
e576cab4 JB |
156 | if (nargs >= 3) |
157 | { | |
158 | register Lisp_Object tem; | |
044512ed | 159 | |
e576cab4 JB |
160 | buffer = tem = args[2]; |
161 | if (!(EQ (tem, Qnil) | |
162 | || EQ (tem, Qt) | |
163 | || XFASTINT (tem) == 0)) | |
164 | { | |
165 | buffer = Fget_buffer (tem); | |
166 | CHECK_BUFFER (buffer, 2); | |
167 | } | |
168 | } | |
169 | else | |
170 | buffer = Qnil; | |
80856e74 | 171 | |
58616e67 JB |
172 | /* Make sure that the child will be able to chdir to the current |
173 | buffer's current directory, or its unhandled equivalent. We | |
174 | can't just have the child check for an error when it does the | |
175 | chdir, since it's in a vfork. | |
176 | ||
177 | We have to GCPRO around this because Fexpand_file_name, | |
178 | Funhandled_file_name_directory, and Ffile_accessible_directory_p | |
179 | might call a file name handling function. The argument list is | |
180 | protected by the caller, so all we really have to worry about is | |
181 | buffer. */ | |
182 | { | |
183 | struct gcpro gcpro1, gcpro2, gcpro3; | |
184 | ||
185 | current_dir = current_buffer->directory; | |
186 | ||
187 | GCPRO3 (infile, buffer, current_dir); | |
188 | ||
189 | current_dir = | |
190 | expand_and_dir_to_file | |
82df4891 | 191 | (Funhandled_file_name_directory (current_dir), Qnil); |
58616e67 JB |
192 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
193 | report_file_error ("Setting current directory", | |
194 | Fcons (current_buffer->directory, Qnil)); | |
195 | ||
196 | UNGCPRO; | |
197 | } | |
198 | ||
e576cab4 | 199 | display = nargs >= 4 ? args[3] : Qnil; |
80856e74 JB |
200 | |
201 | { | |
202 | register int i; | |
203 | for (i = 4; i < nargs; i++) | |
204 | { | |
205 | CHECK_STRING (args[i], i); | |
206 | new_argv[i - 3] = XSTRING (args[i])->data; | |
207 | } | |
208 | /* Program name is first command arg */ | |
209 | new_argv[0] = XSTRING (args[0])->data; | |
210 | new_argv[i - 3] = 0; | |
211 | } | |
212 | ||
e576cab4 | 213 | filefd = open (XSTRING (infile)->data, O_RDONLY, 0); |
80856e74 JB |
214 | if (filefd < 0) |
215 | { | |
e576cab4 | 216 | report_file_error ("Opening process input file", Fcons (infile, Qnil)); |
80856e74 JB |
217 | } |
218 | /* Search for program; barf if not found. */ | |
5437e9f9 | 219 | openp (Vexec_path, args[0], EXEC_SUFFIXES, &path, 1); |
012c6fcb | 220 | if (NILP (path)) |
80856e74 JB |
221 | { |
222 | close (filefd); | |
223 | report_file_error ("Searching for program", Fcons (args[0], Qnil)); | |
224 | } | |
225 | new_argv[0] = XSTRING (path)->data; | |
226 | ||
227 | if (XTYPE (buffer) == Lisp_Int) | |
5437e9f9 | 228 | fd[1] = open (NULL_DEVICE, O_WRONLY), fd[0] = -1; |
80856e74 JB |
229 | else |
230 | { | |
231 | pipe (fd); | |
232 | #if 0 | |
233 | /* Replaced by close_process_descs */ | |
234 | set_exclusive_use (fd[0]); | |
235 | #endif | |
236 | } | |
237 | ||
238 | { | |
239 | /* child_setup must clobber environ in systems with true vfork. | |
240 | Protect it from permanent change. */ | |
241 | register char **save_environ = environ; | |
242 | register int fd1 = fd[1]; | |
80856e74 JB |
243 | |
244 | #if 0 /* Some systems don't have sigblock. */ | |
e065a56e | 245 | mask = sigblock (sigmask (SIGCHLD)); |
80856e74 JB |
246 | #endif |
247 | ||
248 | /* Record that we're about to create a synchronous process. */ | |
249 | synch_process_alive = 1; | |
250 | ||
251 | pid = vfork (); | |
252 | ||
253 | if (pid == 0) | |
254 | { | |
255 | if (fd[0] >= 0) | |
256 | close (fd[0]); | |
257 | #ifdef USG | |
258 | setpgrp (); | |
259 | #else | |
260 | setpgrp (pid, pid); | |
261 | #endif /* USG */ | |
e576cab4 | 262 | child_setup (filefd, fd1, fd1, new_argv, 0, current_dir); |
80856e74 JB |
263 | } |
264 | ||
265 | #if 0 | |
266 | /* Tell SIGCHLD handler to look for this pid. */ | |
267 | synch_process_pid = pid; | |
268 | /* Now let SIGCHLD come through. */ | |
e065a56e | 269 | sigsetmask (mask); |
80856e74 JB |
270 | #endif |
271 | ||
272 | environ = save_environ; | |
273 | ||
274 | close (filefd); | |
275 | close (fd1); | |
276 | } | |
277 | ||
278 | if (pid < 0) | |
279 | { | |
280 | close (fd[0]); | |
281 | report_file_error ("Doing vfork", Qnil); | |
282 | } | |
283 | ||
284 | if (XTYPE (buffer) == Lisp_Int) | |
285 | { | |
286 | #ifndef subprocesses | |
e576cab4 JB |
287 | /* If Emacs has been built with asynchronous subprocess support, |
288 | we don't need to do this, I think because it will then have | |
289 | the facilities for handling SIGCHLD. */ | |
80856e74 JB |
290 | wait_without_blocking (); |
291 | #endif /* subprocesses */ | |
80856e74 JB |
292 | return Qnil; |
293 | } | |
294 | ||
e576cab4 JB |
295 | synch_process_death = 0; |
296 | synch_process_retcode = 0; | |
297 | ||
80856e74 JB |
298 | record_unwind_protect (call_process_cleanup, |
299 | Fcons (make_number (fd[0]), make_number (pid))); | |
300 | ||
301 | ||
302 | if (XTYPE (buffer) == Lisp_Buffer) | |
303 | Fset_buffer (buffer); | |
304 | ||
305 | immediate_quit = 1; | |
306 | QUIT; | |
307 | ||
308 | { | |
309 | register int nread; | |
310 | ||
311 | while ((nread = read (fd[0], buf, sizeof buf)) > 0) | |
312 | { | |
313 | immediate_quit = 0; | |
012c6fcb | 314 | if (!NILP (buffer)) |
80856e74 | 315 | insert (buf, nread); |
012c6fcb | 316 | if (!NILP (display) && INTERACTIVE) |
80856e74 JB |
317 | redisplay_preserve_echo_area (); |
318 | immediate_quit = 1; | |
319 | QUIT; | |
320 | } | |
321 | } | |
322 | ||
323 | /* Wait for it to terminate, unless it already has. */ | |
324 | wait_for_termination (pid); | |
325 | ||
326 | immediate_quit = 0; | |
327 | ||
328 | set_buffer_internal (old); | |
329 | ||
330 | unbind_to (count, Qnil); | |
331 | ||
80856e74 JB |
332 | if (synch_process_death) |
333 | return build_string (synch_process_death); | |
334 | return make_number (synch_process_retcode); | |
335 | } | |
336 | #endif | |
337 | \f | |
9fefd2ba | 338 | static Lisp_Object |
80856e74 JB |
339 | delete_temp_file (name) |
340 | Lisp_Object name; | |
341 | { | |
342 | unlink (XSTRING (name)->data); | |
343 | } | |
344 | ||
345 | DEFUN ("call-process-region", Fcall_process_region, Scall_process_region, | |
346 | 3, MANY, 0, | |
347 | "Send text from START to END to a synchronous process running PROGRAM.\n\ | |
348 | Delete the text if fourth arg DELETE is non-nil.\n\ | |
349 | Insert output in BUFFER before point; t means current buffer;\n\ | |
350 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
351 | Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
352 | Remaining args are passed to PROGRAM at startup as command args.\n\ | |
353 | If BUFFER is nil, returns immediately with value nil.\n\ | |
354 | Otherwise waits for PROGRAM to terminate\n\ | |
e576cab4 | 355 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 356 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
357 | (nargs, args) |
358 | int nargs; | |
359 | register Lisp_Object *args; | |
360 | { | |
361 | register Lisp_Object filename_string, start, end; | |
362 | char tempfile[20]; | |
363 | int count = specpdl_ptr - specpdl; | |
80856e74 JB |
364 | |
365 | #ifdef VMS | |
366 | strcpy (tempfile, "tmp:emacsXXXXXX."); | |
367 | #else | |
368 | strcpy (tempfile, "/tmp/emacsXXXXXX"); | |
369 | #endif | |
370 | mktemp (tempfile); | |
371 | ||
372 | filename_string = build_string (tempfile); | |
373 | start = args[0]; | |
374 | end = args[1]; | |
375 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); | |
376 | record_unwind_protect (delete_temp_file, filename_string); | |
377 | ||
012c6fcb | 378 | if (!NILP (args[3])) |
80856e74 JB |
379 | Fdelete_region (start, end); |
380 | ||
381 | args[3] = filename_string; | |
80856e74 | 382 | |
58616e67 | 383 | return unbind_to (count, Fcall_process (nargs - 2, args + 2)); |
80856e74 JB |
384 | } |
385 | \f | |
386 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
387 | ||
388 | /* This is the last thing run in a newly forked inferior | |
389 | either synchronous or asynchronous. | |
390 | Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2. | |
391 | Initialize inferior's priority, pgrp, connected dir and environment. | |
392 | then exec another program based on new_argv. | |
393 | ||
394 | This function may change environ for the superior process. | |
395 | Therefore, the superior process must save and restore the value | |
396 | of environ around the vfork and the call to this function. | |
397 | ||
398 | ENV is the environment for the subprocess. | |
399 | ||
400 | SET_PGRP is nonzero if we should put the subprocess into a separate | |
e576cab4 JB |
401 | process group. |
402 | ||
403 | CURRENT_DIR is an elisp string giving the path of the current | |
404 | directory the subprocess should have. Since we can't really signal | |
405 | a decent error from within the child, this should be verified as an | |
406 | executable directory by the parent. */ | |
80856e74 | 407 | |
e576cab4 | 408 | child_setup (in, out, err, new_argv, set_pgrp, current_dir) |
80856e74 JB |
409 | int in, out, err; |
410 | register char **new_argv; | |
80856e74 | 411 | int set_pgrp; |
e576cab4 | 412 | Lisp_Object current_dir; |
80856e74 | 413 | { |
e576cab4 JB |
414 | char **env; |
415 | ||
80856e74 JB |
416 | register int pid = getpid(); |
417 | ||
4f0b9d49 JB |
418 | { |
419 | extern int emacs_priority; | |
420 | ||
421 | nice (- emacs_priority); | |
422 | } | |
80856e74 JB |
423 | |
424 | #ifdef subprocesses | |
425 | /* Close Emacs's descriptors that this process should not have. */ | |
426 | close_process_descs (); | |
427 | #endif | |
428 | ||
429 | /* Note that use of alloca is always safe here. It's obvious for systems | |
430 | that do not have true vfork or that have true (stack) alloca. | |
431 | If using vfork and C_ALLOCA it is safe because that changes | |
432 | the superior's static variables as if the superior had done alloca | |
433 | and will be cleaned up in the usual way. */ | |
e576cab4 JB |
434 | { |
435 | register unsigned char *temp; | |
436 | register int i; | |
77d78be1 | 437 | |
e576cab4 JB |
438 | i = XSTRING (current_dir)->size; |
439 | temp = (unsigned char *) alloca (i + 2); | |
440 | bcopy (XSTRING (current_dir)->data, temp, i); | |
441 | if (temp[i - 1] != '/') temp[i++] = '/'; | |
442 | temp[i] = 0; | |
443 | ||
444 | /* We can't signal an Elisp error here; we're in a vfork. Since | |
445 | the callers check the current directory before forking, this | |
446 | should only return an error if the directory's permissions | |
447 | are changed between the check and this chdir, but we should | |
448 | at least check. */ | |
449 | if (chdir (temp) < 0) | |
450 | exit (errno); | |
451 | } | |
80856e74 | 452 | |
80856e74 JB |
453 | /* Set `env' to a vector of the strings in Vprocess_environment. */ |
454 | { | |
455 | register Lisp_Object tem; | |
456 | register char **new_env; | |
457 | register int new_length; | |
458 | ||
459 | new_length = 0; | |
460 | for (tem = Vprocess_environment; | |
461 | (XTYPE (tem) == Lisp_Cons | |
462 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
463 | tem = XCONS (tem)->cdr) | |
464 | new_length++; | |
465 | ||
466 | /* new_length + 1 to include terminating 0 */ | |
467 | env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *)); | |
468 | ||
e576cab4 | 469 | /* Copy the Vprocess_alist strings into new_env. */ |
80856e74 JB |
470 | for (tem = Vprocess_environment; |
471 | (XTYPE (tem) == Lisp_Cons | |
472 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
473 | tem = XCONS (tem)->cdr) | |
474 | *new_env++ = (char *) XSTRING (XCONS (tem)->car)->data; | |
475 | *new_env = 0; | |
476 | } | |
80856e74 | 477 | |
426b37ae JB |
478 | /* Make sure that in, out, and err are not actually already in |
479 | descriptors zero, one, or two; this could happen if Emacs is | |
480 | started with its standard in, our, or error closed, as might | |
481 | happen under X. */ | |
482 | in = relocate_fd (in, 3); | |
483 | out = relocate_fd (out, 3); | |
484 | err = relocate_fd (err, 3); | |
485 | ||
80856e74 JB |
486 | close (0); |
487 | close (1); | |
488 | close (2); | |
489 | ||
490 | dup2 (in, 0); | |
491 | dup2 (out, 1); | |
492 | dup2 (err, 2); | |
493 | close (in); | |
494 | close (out); | |
495 | close (err); | |
496 | ||
e576cab4 JB |
497 | #ifdef USG |
498 | setpgrp (); /* No arguments but equivalent in this case */ | |
499 | #else | |
500 | setpgrp (pid, pid); | |
501 | #endif /* USG */ | |
80856e74 JB |
502 | setpgrp_of_tty (pid); |
503 | ||
504 | #ifdef vipc | |
505 | something missing here; | |
506 | #endif /* vipc */ | |
507 | ||
508 | /* execvp does not accept an environment arg so the only way | |
509 | to pass this environment is to set environ. Our caller | |
510 | is responsible for restoring the ambient value of environ. */ | |
511 | environ = env; | |
512 | execvp (new_argv[0], new_argv); | |
513 | ||
514 | write (1, "Couldn't exec the program ", 26); | |
515 | write (1, new_argv[0], strlen (new_argv[0])); | |
516 | _exit (1); | |
517 | } | |
518 | ||
426b37ae JB |
519 | /* Move the file descriptor FD so that its number is not less than MIN. |
520 | If the file descriptor is moved at all, the original is freed. */ | |
521 | int | |
522 | relocate_fd (fd, min) | |
523 | int fd, min; | |
524 | { | |
525 | if (fd >= min) | |
526 | return fd; | |
527 | else | |
528 | { | |
529 | int new = dup (fd); | |
530 | if (new == -1) | |
531 | { | |
532 | char message1[] = | |
533 | "Error while setting up child: "; | |
534 | char message2[] = "\n"; | |
535 | write (2, message1, sizeof (message1) - 1); | |
536 | write (2, sys_errlist[errno], strlen (sys_errlist[errno])); | |
537 | write (2, message2, sizeof (message2) - 1); | |
538 | _exit (1); | |
539 | } | |
540 | /* Note that we hold the original FD open while we recurse, | |
541 | to guarantee we'll get a new FD if we need it. */ | |
542 | new = relocate_fd (new, min); | |
543 | close (fd); | |
544 | return new; | |
545 | } | |
546 | } | |
547 | ||
012c6fcb JA |
548 | static int |
549 | getenv_internal (var, varlen, value, valuelen) | |
550 | char *var; | |
551 | int varlen; | |
552 | char **value; | |
553 | int *valuelen; | |
554 | { | |
555 | Lisp_Object scan; | |
556 | ||
557 | for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr) | |
558 | { | |
559 | Lisp_Object entry = XCONS (scan)->car; | |
e576cab4 | 560 | |
012c6fcb JA |
561 | if (XTYPE (entry) == Lisp_String |
562 | && XSTRING (entry)->size > varlen | |
563 | && XSTRING (entry)->data[varlen] == '=' | |
564 | && ! bcmp (XSTRING (entry)->data, var, varlen)) | |
565 | { | |
566 | *value = (char *) XSTRING (entry)->data + (varlen + 1); | |
567 | *valuelen = XSTRING (entry)->size - (varlen + 1); | |
568 | return 1; | |
569 | } | |
570 | } | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, 0, | |
576 | "Return the value of environment variable VAR, as a string.\n\ | |
577 | VAR should be a string. Value is nil if VAR is undefined in the environment.\n\ | |
578 | This function consults the variable ``process-environment'' for its value.") | |
579 | (var) | |
580 | Lisp_Object var; | |
581 | { | |
582 | char *value; | |
583 | int valuelen; | |
584 | ||
585 | CHECK_STRING (var, 0); | |
586 | if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size, | |
587 | &value, &valuelen)) | |
588 | return make_string (value, valuelen); | |
589 | else | |
590 | return Qnil; | |
591 | } | |
592 | ||
593 | /* A version of getenv that consults process_environment, easily | |
e576cab4 | 594 | callable from C. */ |
012c6fcb JA |
595 | char * |
596 | egetenv (var) | |
e576cab4 | 597 | char *var; |
012c6fcb JA |
598 | { |
599 | char *value; | |
600 | int valuelen; | |
601 | ||
602 | if (getenv_internal (var, strlen (var), &value, &valuelen)) | |
603 | return value; | |
604 | else | |
605 | return 0; | |
606 | } | |
607 | ||
80856e74 JB |
608 | #endif /* not VMS */ |
609 | \f | |
610 | init_callproc () | |
611 | { | |
612 | register char * sh; | |
e576cab4 JB |
613 | Lisp_Object tempdir; |
614 | ||
615 | { | |
616 | char *data_dir = egetenv ("EMACSDATA"); | |
617 | ||
618 | Vdata_directory = | |
619 | Ffile_name_as_directory | |
620 | (build_string (data_dir ? data_dir : PATH_DATA)); | |
621 | } | |
9453ea7b | 622 | |
e576cab4 JB |
623 | /* Check the EMACSPATH environment variable, defaulting to the |
624 | PATH_EXEC path from paths.h. */ | |
625 | Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC); | |
80856e74 JB |
626 | Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path)); |
627 | Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path); | |
628 | ||
e576cab4 JB |
629 | tempdir = Fdirectory_file_name (Vexec_directory); |
630 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
80856e74 | 631 | { |
e576cab4 | 632 | printf ("Warning: arch-dependent data dir (%s) does not exist.\n", |
80856e74 JB |
633 | XSTRING (Vexec_directory)->data); |
634 | sleep (2); | |
635 | } | |
636 | ||
e576cab4 JB |
637 | tempdir = Fdirectory_file_name (Vdata_directory); |
638 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
639 | { | |
640 | printf ("Warning: arch-independent data dir (%s) does not exist.\n", | |
641 | XSTRING (Vdata_directory)->data); | |
642 | sleep (2); | |
643 | } | |
644 | ||
80856e74 JB |
645 | #ifdef VMS |
646 | Vshell_file_name = build_string ("*dcl*"); | |
647 | #else | |
e576cab4 | 648 | sh = (char *) getenv ("SHELL"); |
80856e74 JB |
649 | Vshell_file_name = build_string (sh ? sh : "/bin/sh"); |
650 | #endif | |
9fefd2ba JB |
651 | } |
652 | ||
653 | set_process_environment () | |
654 | { | |
655 | register char **envp; | |
80856e74 | 656 | |
80856e74 JB |
657 | Vprocess_environment = Qnil; |
658 | #ifndef CANNOT_DUMP | |
659 | if (initialized) | |
660 | #endif | |
661 | for (envp = environ; *envp; envp++) | |
662 | Vprocess_environment = Fcons (build_string (*envp), | |
663 | Vprocess_environment); | |
80856e74 JB |
664 | } |
665 | ||
666 | syms_of_callproc () | |
667 | { | |
668 | DEFVAR_LISP ("shell-file-name", &Vshell_file_name, | |
669 | "*File name to load inferior shells from.\n\ | |
670 | Initialized from the SHELL environment variable."); | |
671 | ||
672 | DEFVAR_LISP ("exec-path", &Vexec_path, | |
673 | "*List of directories to search programs to run in subprocesses.\n\ | |
674 | Each element is a string (directory name) or nil (try default directory)."); | |
675 | ||
676 | DEFVAR_LISP ("exec-directory", &Vexec_directory, | |
e576cab4 JB |
677 | "Directory of architecture-dependent files that come with GNU Emacs,\n\ |
678 | especially executable programs intended for Emacs to invoke."); | |
679 | ||
680 | DEFVAR_LISP ("data-directory", &Vdata_directory, | |
681 | "Directory of architecture-independent files that come with GNU Emacs,\n\ | |
682 | intended for Emacs to use."); | |
80856e74 | 683 | |
80856e74 | 684 | DEFVAR_LISP ("process-environment", &Vprocess_environment, |
e576cab4 JB |
685 | "List of environment variables for subprocesses to inherit.\n\ |
686 | Each element should be a string of the form ENVVARNAME=VALUE.\n\ | |
687 | The environment which Emacs inherits is placed in this variable\n\ | |
688 | when Emacs starts."); | |
80856e74 JB |
689 | |
690 | #ifndef VMS | |
691 | defsubr (&Scall_process); | |
012c6fcb | 692 | defsubr (&Sgetenv); |
986ffb24 | 693 | #endif |
e576cab4 | 694 | defsubr (&Scall_process_region); |
80856e74 | 695 | } |