Commit | Line | Data |
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80856e74 | 1 | /* Synchronous subprocess invocation for GNU Emacs. |
c6c5df7f | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993 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 | 23 | |
18160b98 | 24 | #include <config.h> |
80856e74 | 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> | |
88a64fef | 38 | |
80856e74 JB |
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" | |
2a6b3537 | 55 | #include <paths.h> |
80856e74 | 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; |
ed61592a | 68 | Lisp_Object Vconfigure_info_directory; |
80856e74 JB |
69 | |
70 | Lisp_Object Vshell_file_name; | |
71 | ||
80856e74 | 72 | Lisp_Object Vprocess_environment; |
80856e74 JB |
73 | |
74 | /* True iff we are about to fork off a synchronous process or if we | |
75 | are waiting for it. */ | |
76 | int synch_process_alive; | |
77 | ||
78 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ | |
79 | char *synch_process_death; | |
80 | ||
81 | /* If synch_process_death is zero, | |
82 | this is exit code of synchronous subprocess. */ | |
83 | int synch_process_retcode; | |
84 | \f | |
85 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
86 | ||
d177f194 JB |
87 | static Lisp_Object |
88 | call_process_kill (fdpid) | |
89 | Lisp_Object fdpid; | |
90 | { | |
91 | close (XFASTINT (Fcar (fdpid))); | |
92 | EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL); | |
93 | synch_process_alive = 0; | |
94 | return Qnil; | |
95 | } | |
96 | ||
80856e74 JB |
97 | Lisp_Object |
98 | call_process_cleanup (fdpid) | |
99 | Lisp_Object fdpid; | |
100 | { | |
d177f194 JB |
101 | register int pid = XFASTINT (Fcdr (fdpid)); |
102 | ||
103 | if (EMACS_KILLPG (pid, SIGINT) == 0) | |
104 | { | |
105 | int count = specpdl_ptr - specpdl; | |
106 | record_unwind_protect (call_process_kill, fdpid); | |
107 | message1 ("Waiting for process to die...(type C-g again to kill it instantly)"); | |
108 | immediate_quit = 1; | |
109 | QUIT; | |
110 | wait_for_termination (pid); | |
111 | immediate_quit = 0; | |
112 | specpdl_ptr = specpdl + count; /* Discard the unwind protect. */ | |
113 | message1 ("Waiting for process to die...done"); | |
114 | } | |
80856e74 | 115 | synch_process_alive = 0; |
d177f194 | 116 | close (XFASTINT (Fcar (fdpid))); |
80856e74 JB |
117 | return Qnil; |
118 | } | |
119 | ||
120 | DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0, | |
121 | "Call PROGRAM synchronously in separate process.\n\ | |
122 | The program's input comes from file INFILE (nil means `/dev/null').\n\ | |
123 | Insert output in BUFFER before point; t means current buffer;\n\ | |
124 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
125 | Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
126 | Remaining arguments are strings passed as command arguments to PROGRAM.\n\ | |
e576cab4 | 127 | If BUFFER is 0, returns immediately with value nil.\n\ |
80856e74 | 128 | Otherwise waits for PROGRAM to terminate\n\ |
e576cab4 | 129 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 130 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
131 | (nargs, args) |
132 | int nargs; | |
133 | register Lisp_Object *args; | |
134 | { | |
58616e67 | 135 | Lisp_Object infile, buffer, current_dir, display, path; |
80856e74 JB |
136 | int fd[2]; |
137 | int filefd; | |
138 | register int pid; | |
139 | char buf[1024]; | |
140 | int count = specpdl_ptr - specpdl; | |
141 | register unsigned char **new_argv | |
142 | = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *)); | |
143 | struct buffer *old = current_buffer; | |
144 | #if 0 | |
145 | int mask; | |
146 | #endif | |
80856e74 JB |
147 | CHECK_STRING (args[0], 0); |
148 | ||
e576cab4 JB |
149 | if (nargs >= 2 && ! NILP (args[1])) |
150 | { | |
151 | infile = Fexpand_file_name (args[1], current_buffer->directory); | |
152 | CHECK_STRING (infile, 1); | |
153 | } | |
80856e74 | 154 | else |
5437e9f9 | 155 | infile = build_string (NULL_DEVICE); |
80856e74 | 156 | |
e576cab4 JB |
157 | if (nargs >= 3) |
158 | { | |
159 | register Lisp_Object tem; | |
044512ed | 160 | |
e576cab4 JB |
161 | buffer = tem = args[2]; |
162 | if (!(EQ (tem, Qnil) | |
163 | || EQ (tem, Qt) | |
164 | || XFASTINT (tem) == 0)) | |
165 | { | |
166 | buffer = Fget_buffer (tem); | |
167 | CHECK_BUFFER (buffer, 2); | |
168 | } | |
169 | } | |
170 | else | |
171 | buffer = Qnil; | |
80856e74 | 172 | |
58616e67 JB |
173 | /* Make sure that the child will be able to chdir to the current |
174 | buffer's current directory, or its unhandled equivalent. We | |
175 | can't just have the child check for an error when it does the | |
176 | chdir, since it's in a vfork. | |
177 | ||
178 | We have to GCPRO around this because Fexpand_file_name, | |
179 | Funhandled_file_name_directory, and Ffile_accessible_directory_p | |
180 | might call a file name handling function. The argument list is | |
181 | protected by the caller, so all we really have to worry about is | |
182 | buffer. */ | |
183 | { | |
184 | struct gcpro gcpro1, gcpro2, gcpro3; | |
185 | ||
186 | current_dir = current_buffer->directory; | |
187 | ||
188 | GCPRO3 (infile, buffer, current_dir); | |
189 | ||
190 | current_dir = | |
191 | expand_and_dir_to_file | |
82df4891 | 192 | (Funhandled_file_name_directory (current_dir), Qnil); |
58616e67 JB |
193 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
194 | report_file_error ("Setting current directory", | |
195 | Fcons (current_buffer->directory, Qnil)); | |
196 | ||
197 | UNGCPRO; | |
198 | } | |
199 | ||
e576cab4 | 200 | display = nargs >= 4 ? args[3] : Qnil; |
80856e74 JB |
201 | |
202 | { | |
203 | register int i; | |
204 | for (i = 4; i < nargs; i++) | |
205 | { | |
206 | CHECK_STRING (args[i], i); | |
207 | new_argv[i - 3] = XSTRING (args[i])->data; | |
208 | } | |
209 | /* Program name is first command arg */ | |
210 | new_argv[0] = XSTRING (args[0])->data; | |
211 | new_argv[i - 3] = 0; | |
212 | } | |
213 | ||
e576cab4 | 214 | filefd = open (XSTRING (infile)->data, O_RDONLY, 0); |
80856e74 JB |
215 | if (filefd < 0) |
216 | { | |
e576cab4 | 217 | report_file_error ("Opening process input file", Fcons (infile, Qnil)); |
80856e74 JB |
218 | } |
219 | /* Search for program; barf if not found. */ | |
5437e9f9 | 220 | openp (Vexec_path, args[0], EXEC_SUFFIXES, &path, 1); |
012c6fcb | 221 | if (NILP (path)) |
80856e74 JB |
222 | { |
223 | close (filefd); | |
224 | report_file_error ("Searching for program", Fcons (args[0], Qnil)); | |
225 | } | |
226 | new_argv[0] = XSTRING (path)->data; | |
227 | ||
228 | if (XTYPE (buffer) == Lisp_Int) | |
5437e9f9 | 229 | fd[1] = open (NULL_DEVICE, O_WRONLY), fd[0] = -1; |
80856e74 JB |
230 | else |
231 | { | |
232 | pipe (fd); | |
233 | #if 0 | |
234 | /* Replaced by close_process_descs */ | |
235 | set_exclusive_use (fd[0]); | |
236 | #endif | |
237 | } | |
238 | ||
239 | { | |
240 | /* child_setup must clobber environ in systems with true vfork. | |
241 | Protect it from permanent change. */ | |
242 | register char **save_environ = environ; | |
243 | register int fd1 = fd[1]; | |
80856e74 JB |
244 | |
245 | #if 0 /* Some systems don't have sigblock. */ | |
e065a56e | 246 | mask = sigblock (sigmask (SIGCHLD)); |
80856e74 JB |
247 | #endif |
248 | ||
249 | /* Record that we're about to create a synchronous process. */ | |
250 | synch_process_alive = 1; | |
251 | ||
5c03767e RS |
252 | /* These vars record information from process termination. |
253 | Clear them now before process can possibly terminate, | |
254 | to avoid timing error if process terminates soon. */ | |
255 | synch_process_death = 0; | |
256 | synch_process_retcode = 0; | |
257 | ||
80856e74 JB |
258 | pid = vfork (); |
259 | ||
260 | if (pid == 0) | |
261 | { | |
262 | if (fd[0] >= 0) | |
263 | close (fd[0]); | |
5a570e37 | 264 | #ifdef USG |
80856e74 JB |
265 | setpgrp (); |
266 | #else | |
267 | setpgrp (pid, pid); | |
268 | #endif /* USG */ | |
e576cab4 | 269 | child_setup (filefd, fd1, fd1, new_argv, 0, current_dir); |
80856e74 JB |
270 | } |
271 | ||
272 | #if 0 | |
273 | /* Tell SIGCHLD handler to look for this pid. */ | |
274 | synch_process_pid = pid; | |
275 | /* Now let SIGCHLD come through. */ | |
e065a56e | 276 | sigsetmask (mask); |
80856e74 JB |
277 | #endif |
278 | ||
279 | environ = save_environ; | |
280 | ||
281 | close (filefd); | |
282 | close (fd1); | |
283 | } | |
284 | ||
285 | if (pid < 0) | |
286 | { | |
287 | close (fd[0]); | |
288 | report_file_error ("Doing vfork", Qnil); | |
289 | } | |
290 | ||
291 | if (XTYPE (buffer) == Lisp_Int) | |
292 | { | |
293 | #ifndef subprocesses | |
e576cab4 JB |
294 | /* If Emacs has been built with asynchronous subprocess support, |
295 | we don't need to do this, I think because it will then have | |
296 | the facilities for handling SIGCHLD. */ | |
80856e74 JB |
297 | wait_without_blocking (); |
298 | #endif /* subprocesses */ | |
80856e74 JB |
299 | return Qnil; |
300 | } | |
301 | ||
302 | record_unwind_protect (call_process_cleanup, | |
303 | Fcons (make_number (fd[0]), make_number (pid))); | |
304 | ||
305 | ||
306 | if (XTYPE (buffer) == Lisp_Buffer) | |
307 | Fset_buffer (buffer); | |
308 | ||
309 | immediate_quit = 1; | |
310 | QUIT; | |
311 | ||
312 | { | |
313 | register int nread; | |
314 | ||
315 | while ((nread = read (fd[0], buf, sizeof buf)) > 0) | |
316 | { | |
317 | immediate_quit = 0; | |
012c6fcb | 318 | if (!NILP (buffer)) |
80856e74 | 319 | insert (buf, nread); |
012c6fcb | 320 | if (!NILP (display) && INTERACTIVE) |
80856e74 JB |
321 | redisplay_preserve_echo_area (); |
322 | immediate_quit = 1; | |
323 | QUIT; | |
324 | } | |
325 | } | |
326 | ||
327 | /* Wait for it to terminate, unless it already has. */ | |
328 | wait_for_termination (pid); | |
329 | ||
330 | immediate_quit = 0; | |
331 | ||
332 | set_buffer_internal (old); | |
333 | ||
334 | unbind_to (count, Qnil); | |
335 | ||
80856e74 JB |
336 | if (synch_process_death) |
337 | return build_string (synch_process_death); | |
338 | return make_number (synch_process_retcode); | |
339 | } | |
340 | #endif | |
341 | \f | |
9fefd2ba | 342 | static Lisp_Object |
80856e74 JB |
343 | delete_temp_file (name) |
344 | Lisp_Object name; | |
345 | { | |
346 | unlink (XSTRING (name)->data); | |
347 | } | |
348 | ||
349 | DEFUN ("call-process-region", Fcall_process_region, Scall_process_region, | |
350 | 3, MANY, 0, | |
351 | "Send text from START to END to a synchronous process running PROGRAM.\n\ | |
352 | Delete the text if fourth arg DELETE is non-nil.\n\ | |
353 | Insert output in BUFFER before point; t means current buffer;\n\ | |
354 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
355 | Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
356 | Remaining args are passed to PROGRAM at startup as command args.\n\ | |
357 | If BUFFER is nil, returns immediately with value nil.\n\ | |
358 | Otherwise waits for PROGRAM to terminate\n\ | |
e576cab4 | 359 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 360 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
361 | (nargs, args) |
362 | int nargs; | |
363 | register Lisp_Object *args; | |
364 | { | |
365 | register Lisp_Object filename_string, start, end; | |
366 | char tempfile[20]; | |
367 | int count = specpdl_ptr - specpdl; | |
80856e74 JB |
368 | |
369 | #ifdef VMS | |
370 | strcpy (tempfile, "tmp:emacsXXXXXX."); | |
371 | #else | |
372 | strcpy (tempfile, "/tmp/emacsXXXXXX"); | |
373 | #endif | |
374 | mktemp (tempfile); | |
375 | ||
376 | filename_string = build_string (tempfile); | |
377 | start = args[0]; | |
378 | end = args[1]; | |
379 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); | |
380 | record_unwind_protect (delete_temp_file, filename_string); | |
381 | ||
012c6fcb | 382 | if (!NILP (args[3])) |
80856e74 JB |
383 | Fdelete_region (start, end); |
384 | ||
385 | args[3] = filename_string; | |
80856e74 | 386 | |
58616e67 | 387 | return unbind_to (count, Fcall_process (nargs - 2, args + 2)); |
80856e74 JB |
388 | } |
389 | \f | |
390 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
391 | ||
392 | /* This is the last thing run in a newly forked inferior | |
393 | either synchronous or asynchronous. | |
394 | Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2. | |
395 | Initialize inferior's priority, pgrp, connected dir and environment. | |
396 | then exec another program based on new_argv. | |
397 | ||
398 | This function may change environ for the superior process. | |
399 | Therefore, the superior process must save and restore the value | |
400 | of environ around the vfork and the call to this function. | |
401 | ||
402 | ENV is the environment for the subprocess. | |
403 | ||
404 | SET_PGRP is nonzero if we should put the subprocess into a separate | |
e576cab4 JB |
405 | process group. |
406 | ||
407 | CURRENT_DIR is an elisp string giving the path of the current | |
408 | directory the subprocess should have. Since we can't really signal | |
409 | a decent error from within the child, this should be verified as an | |
410 | executable directory by the parent. */ | |
80856e74 | 411 | |
e576cab4 | 412 | child_setup (in, out, err, new_argv, set_pgrp, current_dir) |
80856e74 JB |
413 | int in, out, err; |
414 | register char **new_argv; | |
80856e74 | 415 | int set_pgrp; |
e576cab4 | 416 | Lisp_Object current_dir; |
80856e74 | 417 | { |
e576cab4 JB |
418 | char **env; |
419 | ||
80856e74 JB |
420 | register int pid = getpid(); |
421 | ||
4f0b9d49 JB |
422 | { |
423 | extern int emacs_priority; | |
424 | ||
425 | nice (- emacs_priority); | |
426 | } | |
80856e74 JB |
427 | |
428 | #ifdef subprocesses | |
429 | /* Close Emacs's descriptors that this process should not have. */ | |
430 | close_process_descs (); | |
431 | #endif | |
432 | ||
433 | /* Note that use of alloca is always safe here. It's obvious for systems | |
434 | that do not have true vfork or that have true (stack) alloca. | |
435 | If using vfork and C_ALLOCA it is safe because that changes | |
436 | the superior's static variables as if the superior had done alloca | |
437 | and will be cleaned up in the usual way. */ | |
e576cab4 JB |
438 | { |
439 | register unsigned char *temp; | |
440 | register int i; | |
77d78be1 | 441 | |
e576cab4 JB |
442 | i = XSTRING (current_dir)->size; |
443 | temp = (unsigned char *) alloca (i + 2); | |
444 | bcopy (XSTRING (current_dir)->data, temp, i); | |
445 | if (temp[i - 1] != '/') temp[i++] = '/'; | |
446 | temp[i] = 0; | |
447 | ||
448 | /* We can't signal an Elisp error here; we're in a vfork. Since | |
449 | the callers check the current directory before forking, this | |
450 | should only return an error if the directory's permissions | |
451 | are changed between the check and this chdir, but we should | |
452 | at least check. */ | |
453 | if (chdir (temp) < 0) | |
454 | exit (errno); | |
455 | } | |
80856e74 | 456 | |
80856e74 JB |
457 | /* Set `env' to a vector of the strings in Vprocess_environment. */ |
458 | { | |
459 | register Lisp_Object tem; | |
460 | register char **new_env; | |
461 | register int new_length; | |
462 | ||
463 | new_length = 0; | |
464 | for (tem = Vprocess_environment; | |
465 | (XTYPE (tem) == Lisp_Cons | |
466 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
467 | tem = XCONS (tem)->cdr) | |
468 | new_length++; | |
469 | ||
cd9565ba | 470 | /* new_length + 1 to include terminating 0. */ |
80856e74 JB |
471 | env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *)); |
472 | ||
cd9565ba | 473 | /* Copy the Vprocess_environment strings into new_env. */ |
80856e74 JB |
474 | for (tem = Vprocess_environment; |
475 | (XTYPE (tem) == Lisp_Cons | |
476 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
477 | tem = XCONS (tem)->cdr) | |
cd9565ba RS |
478 | { |
479 | char **ep = env; | |
480 | char *string = (char *) XSTRING (XCONS (tem)->car)->data; | |
481 | /* See if this string duplicates any string already in the env. | |
482 | If so, don't put it in. | |
483 | When an env var has multiple definitions, | |
484 | we keep the definition that comes first in process-environment. */ | |
485 | for (; ep != new_env; ep++) | |
486 | { | |
487 | char *p = *ep, *q = string; | |
488 | while (1) | |
489 | { | |
490 | if (*q == 0) | |
491 | /* The string is malformed; might as well drop it. */ | |
492 | goto duplicate; | |
493 | if (*q != *p) | |
494 | break; | |
495 | if (*q == '=') | |
496 | goto duplicate; | |
497 | p++, q++; | |
498 | } | |
499 | } | |
500 | *new_env++ = string; | |
501 | duplicate: ; | |
502 | } | |
80856e74 JB |
503 | *new_env = 0; |
504 | } | |
80856e74 | 505 | |
426b37ae JB |
506 | /* Make sure that in, out, and err are not actually already in |
507 | descriptors zero, one, or two; this could happen if Emacs is | |
508 | started with its standard in, our, or error closed, as might | |
509 | happen under X. */ | |
510 | in = relocate_fd (in, 3); | |
511 | out = relocate_fd (out, 3); | |
512 | err = relocate_fd (err, 3); | |
513 | ||
80856e74 JB |
514 | close (0); |
515 | close (1); | |
516 | close (2); | |
517 | ||
518 | dup2 (in, 0); | |
519 | dup2 (out, 1); | |
520 | dup2 (err, 2); | |
521 | close (in); | |
522 | close (out); | |
523 | close (err); | |
524 | ||
1319549a JB |
525 | #if !defined (IRIX) |
526 | #if defined (USG) | |
e576cab4 JB |
527 | setpgrp (); /* No arguments but equivalent in this case */ |
528 | #else | |
529 | setpgrp (pid, pid); | |
530 | #endif /* USG */ | |
1319549a | 531 | #endif /* IRIX */ |
80856e74 JB |
532 | setpgrp_of_tty (pid); |
533 | ||
534 | #ifdef vipc | |
535 | something missing here; | |
536 | #endif /* vipc */ | |
537 | ||
538 | /* execvp does not accept an environment arg so the only way | |
539 | to pass this environment is to set environ. Our caller | |
540 | is responsible for restoring the ambient value of environ. */ | |
541 | environ = env; | |
542 | execvp (new_argv[0], new_argv); | |
543 | ||
544 | write (1, "Couldn't exec the program ", 26); | |
545 | write (1, new_argv[0], strlen (new_argv[0])); | |
546 | _exit (1); | |
547 | } | |
548 | ||
426b37ae JB |
549 | /* Move the file descriptor FD so that its number is not less than MIN. |
550 | If the file descriptor is moved at all, the original is freed. */ | |
551 | int | |
552 | relocate_fd (fd, min) | |
553 | int fd, min; | |
554 | { | |
555 | if (fd >= min) | |
556 | return fd; | |
557 | else | |
558 | { | |
559 | int new = dup (fd); | |
560 | if (new == -1) | |
561 | { | |
20c018a0 JB |
562 | char *message1 = "Error while setting up child: "; |
563 | char *message2 = "\n"; | |
564 | write (2, message1, strlen (message1)); | |
426b37ae | 565 | write (2, sys_errlist[errno], strlen (sys_errlist[errno])); |
20c018a0 | 566 | write (2, message2, strlen (message2)); |
426b37ae JB |
567 | _exit (1); |
568 | } | |
569 | /* Note that we hold the original FD open while we recurse, | |
570 | to guarantee we'll get a new FD if we need it. */ | |
571 | new = relocate_fd (new, min); | |
572 | close (fd); | |
573 | return new; | |
574 | } | |
575 | } | |
576 | ||
012c6fcb JA |
577 | static int |
578 | getenv_internal (var, varlen, value, valuelen) | |
579 | char *var; | |
580 | int varlen; | |
581 | char **value; | |
582 | int *valuelen; | |
583 | { | |
584 | Lisp_Object scan; | |
585 | ||
586 | for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr) | |
587 | { | |
588 | Lisp_Object entry = XCONS (scan)->car; | |
e576cab4 | 589 | |
012c6fcb JA |
590 | if (XTYPE (entry) == Lisp_String |
591 | && XSTRING (entry)->size > varlen | |
592 | && XSTRING (entry)->data[varlen] == '=' | |
593 | && ! bcmp (XSTRING (entry)->data, var, varlen)) | |
594 | { | |
595 | *value = (char *) XSTRING (entry)->data + (varlen + 1); | |
596 | *valuelen = XSTRING (entry)->size - (varlen + 1); | |
597 | return 1; | |
598 | } | |
599 | } | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, 0, | |
605 | "Return the value of environment variable VAR, as a string.\n\ | |
606 | VAR should be a string. Value is nil if VAR is undefined in the environment.\n\ | |
607 | This function consults the variable ``process-environment'' for its value.") | |
608 | (var) | |
609 | Lisp_Object var; | |
610 | { | |
611 | char *value; | |
612 | int valuelen; | |
613 | ||
614 | CHECK_STRING (var, 0); | |
615 | if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size, | |
616 | &value, &valuelen)) | |
617 | return make_string (value, valuelen); | |
618 | else | |
619 | return Qnil; | |
620 | } | |
621 | ||
622 | /* A version of getenv that consults process_environment, easily | |
e576cab4 | 623 | callable from C. */ |
012c6fcb JA |
624 | char * |
625 | egetenv (var) | |
e576cab4 | 626 | char *var; |
012c6fcb JA |
627 | { |
628 | char *value; | |
629 | int valuelen; | |
630 | ||
631 | if (getenv_internal (var, strlen (var), &value, &valuelen)) | |
632 | return value; | |
633 | else | |
634 | return 0; | |
635 | } | |
636 | ||
80856e74 JB |
637 | #endif /* not VMS */ |
638 | \f | |
639 | init_callproc () | |
640 | { | |
641 | register char * sh; | |
e576cab4 JB |
642 | Lisp_Object tempdir; |
643 | ||
644 | { | |
645 | char *data_dir = egetenv ("EMACSDATA"); | |
646 | ||
647 | Vdata_directory = | |
648 | Ffile_name_as_directory | |
649 | (build_string (data_dir ? data_dir : PATH_DATA)); | |
650 | } | |
9453ea7b | 651 | |
e576cab4 JB |
652 | /* Check the EMACSPATH environment variable, defaulting to the |
653 | PATH_EXEC path from paths.h. */ | |
654 | Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC); | |
80856e74 JB |
655 | Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path)); |
656 | Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path); | |
657 | ||
e576cab4 JB |
658 | tempdir = Fdirectory_file_name (Vexec_directory); |
659 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
80856e74 | 660 | { |
e576cab4 | 661 | printf ("Warning: arch-dependent data dir (%s) does not exist.\n", |
80856e74 JB |
662 | XSTRING (Vexec_directory)->data); |
663 | sleep (2); | |
664 | } | |
665 | ||
e576cab4 JB |
666 | tempdir = Fdirectory_file_name (Vdata_directory); |
667 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
668 | { | |
669 | printf ("Warning: arch-independent data dir (%s) does not exist.\n", | |
670 | XSTRING (Vdata_directory)->data); | |
671 | sleep (2); | |
672 | } | |
673 | ||
80856e74 JB |
674 | #ifdef VMS |
675 | Vshell_file_name = build_string ("*dcl*"); | |
676 | #else | |
e576cab4 | 677 | sh = (char *) getenv ("SHELL"); |
80856e74 JB |
678 | Vshell_file_name = build_string (sh ? sh : "/bin/sh"); |
679 | #endif | |
9fefd2ba JB |
680 | } |
681 | ||
682 | set_process_environment () | |
683 | { | |
684 | register char **envp; | |
80856e74 | 685 | |
80856e74 JB |
686 | Vprocess_environment = Qnil; |
687 | #ifndef CANNOT_DUMP | |
688 | if (initialized) | |
689 | #endif | |
690 | for (envp = environ; *envp; envp++) | |
691 | Vprocess_environment = Fcons (build_string (*envp), | |
692 | Vprocess_environment); | |
80856e74 JB |
693 | } |
694 | ||
695 | syms_of_callproc () | |
696 | { | |
697 | DEFVAR_LISP ("shell-file-name", &Vshell_file_name, | |
698 | "*File name to load inferior shells from.\n\ | |
699 | Initialized from the SHELL environment variable."); | |
700 | ||
701 | DEFVAR_LISP ("exec-path", &Vexec_path, | |
702 | "*List of directories to search programs to run in subprocesses.\n\ | |
703 | Each element is a string (directory name) or nil (try default directory)."); | |
704 | ||
705 | DEFVAR_LISP ("exec-directory", &Vexec_directory, | |
e576cab4 JB |
706 | "Directory of architecture-dependent files that come with GNU Emacs,\n\ |
707 | especially executable programs intended for Emacs to invoke."); | |
708 | ||
709 | DEFVAR_LISP ("data-directory", &Vdata_directory, | |
710 | "Directory of architecture-independent files that come with GNU Emacs,\n\ | |
711 | intended for Emacs to use."); | |
80856e74 | 712 | |
ed61592a JB |
713 | DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory, |
714 | "For internal use by the build procedure only.\n\ | |
715 | This is the name of the directory in which the build procedure installed\n\ | |
716 | Emacs's info files; the default value for Info-default-directory-list\n\ | |
717 | includes this."); | |
718 | Vconfigure_info_directory = build_string (PATH_INFO); | |
719 | ||
80856e74 | 720 | DEFVAR_LISP ("process-environment", &Vprocess_environment, |
e576cab4 JB |
721 | "List of environment variables for subprocesses to inherit.\n\ |
722 | Each element should be a string of the form ENVVARNAME=VALUE.\n\ | |
723 | The environment which Emacs inherits is placed in this variable\n\ | |
724 | when Emacs starts."); | |
80856e74 JB |
725 | |
726 | #ifndef VMS | |
727 | defsubr (&Scall_process); | |
012c6fcb | 728 | defsubr (&Sgetenv); |
986ffb24 | 729 | #endif |
e576cab4 | 730 | defsubr (&Scall_process_region); |
80856e74 | 731 | } |