Commit | Line | Data |
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80856e74 | 1 | /* Synchronous subprocess invocation for GNU Emacs. |
826c56ac | 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994 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 | |
826c56ac | 8 | the Free Software Foundation; either version 2, or (at your option) |
80856e74 JB |
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> |
565620a5 | 25 | #include <stdio.h> |
80856e74 | 26 | |
426b37ae | 27 | extern int errno; |
826c56ac | 28 | extern char *strerror (); |
426b37ae | 29 | |
80856e74 JB |
30 | /* Define SIGCHLD as an alias for SIGCLD. */ |
31 | ||
32 | #if !defined (SIGCHLD) && defined (SIGCLD) | |
33 | #define SIGCHLD SIGCLD | |
34 | #endif /* SIGCLD */ | |
35 | ||
36 | #include <sys/types.h> | |
88a64fef | 37 | |
80856e74 JB |
38 | #include <sys/file.h> |
39 | #ifdef USG5 | |
472e83fe | 40 | #define INCLUDED_FCNTL |
80856e74 JB |
41 | #include <fcntl.h> |
42 | #endif | |
43 | ||
7e6c2178 | 44 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ |
00353d4f | 45 | #include "msdos.h" |
472e83fe | 46 | #define INCLUDED_FCNTL |
7e6c2178 RS |
47 | #include <fcntl.h> |
48 | #include <sys/stat.h> | |
49 | #include <sys/param.h> | |
50 | #include <errno.h> | |
51 | #endif /* MSDOS */ | |
52 | ||
80856e74 JB |
53 | #ifndef O_RDONLY |
54 | #define O_RDONLY 0 | |
55 | #endif | |
56 | ||
57 | #ifndef O_WRONLY | |
58 | #define O_WRONLY 1 | |
59 | #endif | |
60 | ||
61 | #include "lisp.h" | |
62 | #include "commands.h" | |
63 | #include "buffer.h" | |
2a6b3537 | 64 | #include <paths.h> |
80856e74 | 65 | #include "process.h" |
d177f194 | 66 | #include "syssignal.h" |
a129418f | 67 | #include "systty.h" |
80856e74 JB |
68 | |
69 | #ifdef VMS | |
70 | extern noshare char **environ; | |
71 | #else | |
72 | extern char **environ; | |
73 | #endif | |
74 | ||
75 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
76 | ||
7e6c2178 | 77 | #ifdef MSDOS |
093650fe RS |
78 | /* When we are starting external processes we need to know whether they |
79 | take binary input (no conversion) or text input (\n is converted to | |
80 | \r\n). Similar for output: if newlines are written as \r\n then it's | |
81 | text process output, otherwise it's binary. */ | |
82 | Lisp_Object Vbinary_process_input; | |
83 | Lisp_Object Vbinary_process_output; | |
7e6c2178 RS |
84 | #endif |
85 | ||
35a2f4b8 | 86 | Lisp_Object Vexec_path, Vexec_directory, Vdata_directory, Vdoc_directory; |
ed61592a | 87 | Lisp_Object Vconfigure_info_directory; |
80856e74 JB |
88 | |
89 | Lisp_Object Vshell_file_name; | |
90 | ||
80856e74 | 91 | Lisp_Object Vprocess_environment; |
80856e74 | 92 | |
093650fe RS |
93 | #ifdef MSDOS |
94 | Lisp_Object Qbuffer_file_type; | |
95 | #endif | |
96 | ||
80856e74 JB |
97 | /* True iff we are about to fork off a synchronous process or if we |
98 | are waiting for it. */ | |
99 | int synch_process_alive; | |
100 | ||
101 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ | |
102 | char *synch_process_death; | |
103 | ||
104 | /* If synch_process_death is zero, | |
105 | this is exit code of synchronous subprocess. */ | |
106 | int synch_process_retcode; | |
8de15d69 RS |
107 | |
108 | extern Lisp_Object Vdoc_file_name; | |
80856e74 | 109 | \f |
37d54121 RS |
110 | /* Clean up when exiting Fcall_process. |
111 | On MSDOS, delete the temporary file on any kind of termination. | |
112 | On Unix, kill the process and any children on termination by signal. */ | |
113 | ||
114 | /* Nonzero if this is termination due to exit. */ | |
115 | static int call_process_exited; | |
116 | ||
80856e74 JB |
117 | #ifndef VMS /* VMS version is in vmsproc.c. */ |
118 | ||
d177f194 JB |
119 | static Lisp_Object |
120 | call_process_kill (fdpid) | |
121 | Lisp_Object fdpid; | |
122 | { | |
123 | close (XFASTINT (Fcar (fdpid))); | |
124 | EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL); | |
125 | synch_process_alive = 0; | |
126 | return Qnil; | |
127 | } | |
128 | ||
80856e74 JB |
129 | Lisp_Object |
130 | call_process_cleanup (fdpid) | |
131 | Lisp_Object fdpid; | |
132 | { | |
7e6c2178 RS |
133 | #ifdef MSDOS |
134 | /* for MSDOS fdpid is really (fd . tempfile) */ | |
c1350752 KH |
135 | register Lisp_Object file; |
136 | file = Fcdr (fdpid); | |
7e6c2178 RS |
137 | close (XFASTINT (Fcar (fdpid))); |
138 | if (strcmp (XSTRING (file)-> data, NULL_DEVICE) != 0) | |
139 | unlink (XSTRING (file)->data); | |
140 | #else /* not MSDOS */ | |
d177f194 JB |
141 | register int pid = XFASTINT (Fcdr (fdpid)); |
142 | ||
6b6e798b | 143 | |
37d54121 | 144 | if (call_process_exited) |
6b6e798b RS |
145 | { |
146 | close (XFASTINT (Fcar (fdpid))); | |
147 | return Qnil; | |
148 | } | |
37d54121 | 149 | |
d177f194 JB |
150 | if (EMACS_KILLPG (pid, SIGINT) == 0) |
151 | { | |
152 | int count = specpdl_ptr - specpdl; | |
153 | record_unwind_protect (call_process_kill, fdpid); | |
154 | message1 ("Waiting for process to die...(type C-g again to kill it instantly)"); | |
155 | immediate_quit = 1; | |
156 | QUIT; | |
157 | wait_for_termination (pid); | |
158 | immediate_quit = 0; | |
159 | specpdl_ptr = specpdl + count; /* Discard the unwind protect. */ | |
160 | message1 ("Waiting for process to die...done"); | |
161 | } | |
80856e74 | 162 | synch_process_alive = 0; |
d177f194 | 163 | close (XFASTINT (Fcar (fdpid))); |
7e6c2178 | 164 | #endif /* not MSDOS */ |
80856e74 JB |
165 | return Qnil; |
166 | } | |
167 | ||
168 | DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0, | |
169 | "Call PROGRAM synchronously in separate process.\n\ | |
170 | The program's input comes from file INFILE (nil means `/dev/null').\n\ | |
171 | Insert output in BUFFER before point; t means current buffer;\n\ | |
172 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
173 | Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
174 | Remaining arguments are strings passed as command arguments to PROGRAM.\n\ | |
e576cab4 | 175 | If BUFFER is 0, returns immediately with value nil.\n\ |
80856e74 | 176 | Otherwise waits for PROGRAM to terminate\n\ |
e576cab4 | 177 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 178 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
179 | (nargs, args) |
180 | int nargs; | |
181 | register Lisp_Object *args; | |
182 | { | |
58616e67 | 183 | Lisp_Object infile, buffer, current_dir, display, path; |
80856e74 JB |
184 | int fd[2]; |
185 | int filefd; | |
186 | register int pid; | |
187 | char buf[1024]; | |
188 | int count = specpdl_ptr - specpdl; | |
189 | register unsigned char **new_argv | |
190 | = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *)); | |
191 | struct buffer *old = current_buffer; | |
7e6c2178 RS |
192 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ |
193 | char *outf, *tempfile; | |
194 | int outfilefd; | |
195 | #endif | |
80856e74 JB |
196 | #if 0 |
197 | int mask; | |
198 | #endif | |
80856e74 JB |
199 | CHECK_STRING (args[0], 0); |
200 | ||
7e6c2178 RS |
201 | #ifndef subprocesses |
202 | /* Without asynchronous processes we cannot have BUFFER == 0. */ | |
203 | if (nargs >= 3 && XTYPE (args[2]) == Lisp_Int) | |
204 | error ("Operating system cannot handle asynchronous subprocesses"); | |
205 | #endif /* subprocesses */ | |
206 | ||
e576cab4 JB |
207 | if (nargs >= 2 && ! NILP (args[1])) |
208 | { | |
209 | infile = Fexpand_file_name (args[1], current_buffer->directory); | |
210 | CHECK_STRING (infile, 1); | |
211 | } | |
80856e74 | 212 | else |
5437e9f9 | 213 | infile = build_string (NULL_DEVICE); |
80856e74 | 214 | |
e576cab4 JB |
215 | if (nargs >= 3) |
216 | { | |
217 | register Lisp_Object tem; | |
044512ed | 218 | |
e576cab4 JB |
219 | buffer = tem = args[2]; |
220 | if (!(EQ (tem, Qnil) | |
221 | || EQ (tem, Qt) | |
222 | || XFASTINT (tem) == 0)) | |
223 | { | |
224 | buffer = Fget_buffer (tem); | |
225 | CHECK_BUFFER (buffer, 2); | |
226 | } | |
227 | } | |
228 | else | |
229 | buffer = Qnil; | |
80856e74 | 230 | |
58616e67 JB |
231 | /* Make sure that the child will be able to chdir to the current |
232 | buffer's current directory, or its unhandled equivalent. We | |
233 | can't just have the child check for an error when it does the | |
234 | chdir, since it's in a vfork. | |
235 | ||
236 | We have to GCPRO around this because Fexpand_file_name, | |
237 | Funhandled_file_name_directory, and Ffile_accessible_directory_p | |
238 | might call a file name handling function. The argument list is | |
239 | protected by the caller, so all we really have to worry about is | |
240 | buffer. */ | |
241 | { | |
242 | struct gcpro gcpro1, gcpro2, gcpro3; | |
243 | ||
244 | current_dir = current_buffer->directory; | |
245 | ||
246 | GCPRO3 (infile, buffer, current_dir); | |
247 | ||
c52b0b34 KH |
248 | current_dir |
249 | = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir), | |
250 | Qnil); | |
58616e67 JB |
251 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
252 | report_file_error ("Setting current directory", | |
253 | Fcons (current_buffer->directory, Qnil)); | |
254 | ||
255 | UNGCPRO; | |
256 | } | |
257 | ||
e576cab4 | 258 | display = nargs >= 4 ? args[3] : Qnil; |
80856e74 | 259 | |
e576cab4 | 260 | filefd = open (XSTRING (infile)->data, O_RDONLY, 0); |
80856e74 JB |
261 | if (filefd < 0) |
262 | { | |
e576cab4 | 263 | report_file_error ("Opening process input file", Fcons (infile, Qnil)); |
80856e74 JB |
264 | } |
265 | /* Search for program; barf if not found. */ | |
c52b0b34 KH |
266 | { |
267 | struct gcpro gcpro1; | |
268 | ||
269 | GCPRO1 (current_dir); | |
270 | openp (Vexec_path, args[0], EXEC_SUFFIXES, &path, 1); | |
271 | UNGCPRO; | |
272 | } | |
012c6fcb | 273 | if (NILP (path)) |
80856e74 JB |
274 | { |
275 | close (filefd); | |
276 | report_file_error ("Searching for program", Fcons (args[0], Qnil)); | |
277 | } | |
278 | new_argv[0] = XSTRING (path)->data; | |
c52b0b34 KH |
279 | { |
280 | register int i; | |
281 | for (i = 4; i < nargs; i++) | |
282 | { | |
283 | CHECK_STRING (args[i], i); | |
284 | new_argv[i - 3] = XSTRING (args[i])->data; | |
285 | } | |
286 | new_argv[i - 3] = 0; | |
287 | } | |
80856e74 | 288 | |
7e6c2178 RS |
289 | #ifdef MSDOS /* MW, July 1993 */ |
290 | /* These vars record information from process termination. | |
291 | Clear them now before process can possibly terminate, | |
292 | to avoid timing error if process terminates soon. */ | |
293 | synch_process_death = 0; | |
294 | synch_process_retcode = 0; | |
295 | ||
296 | if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP"))) | |
297 | strcpy (tempfile = alloca (strlen (outf) + 20), outf); | |
298 | else | |
299 | { | |
300 | tempfile = alloca (20); | |
301 | *tempfile = '\0'; | |
302 | } | |
303 | dostounix_filename (tempfile); | |
304 | if (*tempfile == '\0' || tempfile[strlen (tempfile) - 1] != '/') | |
305 | strcat (tempfile, "/"); | |
306 | strcat (tempfile, "detmp.XXX"); | |
307 | mktemp (tempfile); | |
308 | ||
309 | outfilefd = creat (tempfile, S_IREAD | S_IWRITE); | |
310 | if (outfilefd < 0) | |
311 | { | |
312 | close (filefd); | |
313 | report_file_error ("Opening process output file", Fcons (tempfile, Qnil)); | |
314 | } | |
315 | #endif | |
316 | ||
80856e74 | 317 | if (XTYPE (buffer) == Lisp_Int) |
5437e9f9 | 318 | fd[1] = open (NULL_DEVICE, O_WRONLY), fd[0] = -1; |
80856e74 JB |
319 | else |
320 | { | |
7e6c2178 | 321 | #ifndef MSDOS |
80856e74 | 322 | pipe (fd); |
7e6c2178 | 323 | #endif |
80856e74 JB |
324 | #if 0 |
325 | /* Replaced by close_process_descs */ | |
326 | set_exclusive_use (fd[0]); | |
327 | #endif | |
328 | } | |
329 | ||
330 | { | |
331 | /* child_setup must clobber environ in systems with true vfork. | |
332 | Protect it from permanent change. */ | |
333 | register char **save_environ = environ; | |
334 | register int fd1 = fd[1]; | |
80856e74 JB |
335 | |
336 | #if 0 /* Some systems don't have sigblock. */ | |
e065a56e | 337 | mask = sigblock (sigmask (SIGCHLD)); |
80856e74 JB |
338 | #endif |
339 | ||
340 | /* Record that we're about to create a synchronous process. */ | |
341 | synch_process_alive = 1; | |
342 | ||
5c03767e RS |
343 | /* These vars record information from process termination. |
344 | Clear them now before process can possibly terminate, | |
345 | to avoid timing error if process terminates soon. */ | |
346 | synch_process_death = 0; | |
347 | synch_process_retcode = 0; | |
348 | ||
7e6c2178 | 349 | #ifdef MSDOS /* MW, July 1993 */ |
6b6e798b RS |
350 | /* ??? Someone who knows MSDOG needs to check whether this properly |
351 | closes all descriptors that it opens. */ | |
7e6c2178 RS |
352 | pid = run_msdos_command (new_argv, current_dir, filefd, outfilefd); |
353 | close (outfilefd); | |
354 | fd1 = -1; /* No harm in closing that one! */ | |
093650fe | 355 | fd[0] = open (tempfile, NILP (Vbinary_process_output) ? O_TEXT : O_BINARY); |
7e6c2178 RS |
356 | if (fd[0] < 0) |
357 | { | |
358 | unlink (tempfile); | |
6b6e798b | 359 | close (filefd); |
7e6c2178 RS |
360 | report_file_error ("Cannot re-open temporary file", Qnil); |
361 | } | |
362 | #else /* not MSDOS */ | |
80856e74 JB |
363 | pid = vfork (); |
364 | ||
365 | if (pid == 0) | |
366 | { | |
367 | if (fd[0] >= 0) | |
368 | close (fd[0]); | |
5a570e37 | 369 | #ifdef USG |
80856e74 JB |
370 | setpgrp (); |
371 | #else | |
372 | setpgrp (pid, pid); | |
373 | #endif /* USG */ | |
e576cab4 | 374 | child_setup (filefd, fd1, fd1, new_argv, 0, current_dir); |
80856e74 | 375 | } |
7e6c2178 | 376 | #endif /* not MSDOS */ |
80856e74 | 377 | |
80856e74 JB |
378 | environ = save_environ; |
379 | ||
6b6e798b RS |
380 | /* Close most of our fd's, but not fd[0] |
381 | since we will use that to read input from. */ | |
80856e74 | 382 | close (filefd); |
7e6c2178 RS |
383 | if (fd1 >= 0) |
384 | close (fd1); | |
80856e74 JB |
385 | } |
386 | ||
387 | if (pid < 0) | |
388 | { | |
6b6e798b RS |
389 | if (fd[0] >= 0) |
390 | close (fd[0]); | |
80856e74 JB |
391 | report_file_error ("Doing vfork", Qnil); |
392 | } | |
393 | ||
394 | if (XTYPE (buffer) == Lisp_Int) | |
395 | { | |
6b6e798b RS |
396 | if (fd[0] >= 0) |
397 | close (fd[0]); | |
80856e74 | 398 | #ifndef subprocesses |
e576cab4 JB |
399 | /* If Emacs has been built with asynchronous subprocess support, |
400 | we don't need to do this, I think because it will then have | |
401 | the facilities for handling SIGCHLD. */ | |
80856e74 JB |
402 | wait_without_blocking (); |
403 | #endif /* subprocesses */ | |
80856e74 JB |
404 | return Qnil; |
405 | } | |
406 | ||
6b6e798b | 407 | /* Enable sending signal if user quits below. */ |
37d54121 RS |
408 | call_process_exited = 0; |
409 | ||
7e6c2178 RS |
410 | #ifdef MSDOS |
411 | /* MSDOS needs different cleanup information. */ | |
412 | record_unwind_protect (call_process_cleanup, | |
413 | Fcons (make_number (fd[0]), build_string (tempfile))); | |
414 | #else | |
80856e74 JB |
415 | record_unwind_protect (call_process_cleanup, |
416 | Fcons (make_number (fd[0]), make_number (pid))); | |
7e6c2178 | 417 | #endif /* not MSDOS */ |
80856e74 JB |
418 | |
419 | ||
420 | if (XTYPE (buffer) == Lisp_Buffer) | |
421 | Fset_buffer (buffer); | |
422 | ||
423 | immediate_quit = 1; | |
424 | QUIT; | |
425 | ||
426 | { | |
427 | register int nread; | |
0ad477db | 428 | int first = 1; |
80856e74 | 429 | |
00fb3e95 | 430 | while ((nread = read (fd[0], buf, sizeof buf)) != 0) |
80856e74 | 431 | { |
00fb3e95 RS |
432 | if (nread < 0) |
433 | { | |
434 | #if defined (__osf__) && defined (__alpha) | |
435 | continue; /* Work around bug in DEC OSF/1 V3.0. */ | |
436 | #else | |
437 | break; | |
438 | #endif | |
439 | } | |
80856e74 | 440 | immediate_quit = 0; |
012c6fcb | 441 | if (!NILP (buffer)) |
80856e74 | 442 | insert (buf, nread); |
012c6fcb | 443 | if (!NILP (display) && INTERACTIVE) |
0ad477db RS |
444 | { |
445 | if (first) | |
446 | prepare_menu_bars (); | |
447 | first = 0; | |
448 | redisplay_preserve_echo_area (); | |
449 | } | |
80856e74 JB |
450 | immediate_quit = 1; |
451 | QUIT; | |
452 | } | |
453 | } | |
454 | ||
455 | /* Wait for it to terminate, unless it already has. */ | |
456 | wait_for_termination (pid); | |
457 | ||
458 | immediate_quit = 0; | |
459 | ||
460 | set_buffer_internal (old); | |
461 | ||
37d54121 RS |
462 | /* Don't kill any children that the subprocess may have left behind |
463 | when exiting. */ | |
464 | call_process_exited = 1; | |
465 | ||
80856e74 JB |
466 | unbind_to (count, Qnil); |
467 | ||
80856e74 JB |
468 | if (synch_process_death) |
469 | return build_string (synch_process_death); | |
470 | return make_number (synch_process_retcode); | |
471 | } | |
472 | #endif | |
473 | \f | |
9fefd2ba | 474 | static Lisp_Object |
80856e74 JB |
475 | delete_temp_file (name) |
476 | Lisp_Object name; | |
477 | { | |
59750d69 RS |
478 | /* Use Fdelete_file because that runs a file name handler. |
479 | We did that when writing the file, so we should do so when deleting. */ | |
480 | Fdelete_file (name); | |
80856e74 JB |
481 | } |
482 | ||
483 | DEFUN ("call-process-region", Fcall_process_region, Scall_process_region, | |
484 | 3, MANY, 0, | |
485 | "Send text from START to END to a synchronous process running PROGRAM.\n\ | |
486 | Delete the text if fourth arg DELETE is non-nil.\n\ | |
487 | Insert output in BUFFER before point; t means current buffer;\n\ | |
488 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ | |
489 | Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ | |
490 | Remaining args are passed to PROGRAM at startup as command args.\n\ | |
491 | If BUFFER is nil, returns immediately with value nil.\n\ | |
492 | Otherwise waits for PROGRAM to terminate\n\ | |
e576cab4 | 493 | and returns a numeric exit status or a signal description string.\n\ |
d177f194 | 494 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
80856e74 JB |
495 | (nargs, args) |
496 | int nargs; | |
497 | register Lisp_Object *args; | |
498 | { | |
39323a7e KH |
499 | struct gcpro gcpro1; |
500 | Lisp_Object filename_string; | |
501 | register Lisp_Object start, end; | |
7e6c2178 RS |
502 | #ifdef MSDOS |
503 | char *tempfile; | |
504 | #else | |
80856e74 | 505 | char tempfile[20]; |
7e6c2178 | 506 | #endif |
80856e74 | 507 | int count = specpdl_ptr - specpdl; |
7e6c2178 RS |
508 | #ifdef MSDOS |
509 | char *outf = '\0'; | |
510 | ||
511 | if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP"))) | |
512 | strcpy (tempfile = alloca (strlen (outf) + 20), outf); | |
513 | else | |
514 | { | |
515 | tempfile = alloca (20); | |
516 | *tempfile = '\0'; | |
517 | } | |
518 | dostounix_filename (tempfile); | |
519 | if (tempfile[strlen (tempfile) - 1] != '/') | |
520 | strcat (tempfile, "/"); | |
521 | strcat (tempfile, "detmp.XXX"); | |
522 | #else /* not MSDOS */ | |
80856e74 JB |
523 | |
524 | #ifdef VMS | |
525 | strcpy (tempfile, "tmp:emacsXXXXXX."); | |
526 | #else | |
527 | strcpy (tempfile, "/tmp/emacsXXXXXX"); | |
528 | #endif | |
7e6c2178 RS |
529 | #endif /* not MSDOS */ |
530 | ||
80856e74 JB |
531 | mktemp (tempfile); |
532 | ||
533 | filename_string = build_string (tempfile); | |
39323a7e | 534 | GCPRO1 (filename_string); |
80856e74 JB |
535 | start = args[0]; |
536 | end = args[1]; | |
093650fe RS |
537 | #ifdef MSDOS |
538 | specbind (Qbuffer_file_type, Vbinary_process_input); | |
539 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); | |
540 | unbind_to (count, Qnil); | |
541 | #else | |
80856e74 | 542 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); |
093650fe RS |
543 | #endif |
544 | ||
80856e74 JB |
545 | record_unwind_protect (delete_temp_file, filename_string); |
546 | ||
012c6fcb | 547 | if (!NILP (args[3])) |
80856e74 JB |
548 | Fdelete_region (start, end); |
549 | ||
550 | args[3] = filename_string; | |
80856e74 | 551 | |
39323a7e | 552 | RETURN_UNGCPRO (unbind_to (count, Fcall_process (nargs - 2, args + 2))); |
80856e74 JB |
553 | } |
554 | \f | |
555 | #ifndef VMS /* VMS version is in vmsproc.c. */ | |
556 | ||
557 | /* This is the last thing run in a newly forked inferior | |
558 | either synchronous or asynchronous. | |
559 | Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2. | |
560 | Initialize inferior's priority, pgrp, connected dir and environment. | |
561 | then exec another program based on new_argv. | |
562 | ||
563 | This function may change environ for the superior process. | |
564 | Therefore, the superior process must save and restore the value | |
565 | of environ around the vfork and the call to this function. | |
566 | ||
567 | ENV is the environment for the subprocess. | |
568 | ||
569 | SET_PGRP is nonzero if we should put the subprocess into a separate | |
e576cab4 JB |
570 | process group. |
571 | ||
572 | CURRENT_DIR is an elisp string giving the path of the current | |
573 | directory the subprocess should have. Since we can't really signal | |
574 | a decent error from within the child, this should be verified as an | |
575 | executable directory by the parent. */ | |
80856e74 | 576 | |
e576cab4 | 577 | child_setup (in, out, err, new_argv, set_pgrp, current_dir) |
80856e74 JB |
578 | int in, out, err; |
579 | register char **new_argv; | |
80856e74 | 580 | int set_pgrp; |
e576cab4 | 581 | Lisp_Object current_dir; |
80856e74 | 582 | { |
7e6c2178 RS |
583 | #ifdef MSDOS |
584 | /* The MSDOS port of gcc cannot fork, vfork, ... so we must call system | |
585 | instead. */ | |
586 | #else /* not MSDOS */ | |
e576cab4 | 587 | char **env; |
7fcf7f05 | 588 | char *pwd_var; |
e576cab4 | 589 | |
33abe2d9 | 590 | int pid = getpid (); |
80856e74 | 591 | |
68d10241 | 592 | #ifdef SET_EMACS_PRIORITY |
4f0b9d49 JB |
593 | { |
594 | extern int emacs_priority; | |
595 | ||
68d10241 RS |
596 | if (emacs_priority < 0) |
597 | nice (- emacs_priority); | |
4f0b9d49 | 598 | } |
5b633aeb | 599 | #endif |
80856e74 JB |
600 | |
601 | #ifdef subprocesses | |
602 | /* Close Emacs's descriptors that this process should not have. */ | |
603 | close_process_descs (); | |
604 | #endif | |
4458cebe | 605 | close_load_descs (); |
80856e74 JB |
606 | |
607 | /* Note that use of alloca is always safe here. It's obvious for systems | |
608 | that do not have true vfork or that have true (stack) alloca. | |
609 | If using vfork and C_ALLOCA it is safe because that changes | |
610 | the superior's static variables as if the superior had done alloca | |
611 | and will be cleaned up in the usual way. */ | |
e576cab4 | 612 | { |
7fcf7f05 | 613 | register char *temp; |
e576cab4 | 614 | register int i; |
77d78be1 | 615 | |
e576cab4 | 616 | i = XSTRING (current_dir)->size; |
7fcf7f05 RS |
617 | pwd_var = (char *) alloca (i + 6); |
618 | temp = pwd_var + 4; | |
619 | bcopy ("PWD=", pwd_var, 4); | |
e576cab4 JB |
620 | bcopy (XSTRING (current_dir)->data, temp, i); |
621 | if (temp[i - 1] != '/') temp[i++] = '/'; | |
622 | temp[i] = 0; | |
623 | ||
624 | /* We can't signal an Elisp error here; we're in a vfork. Since | |
625 | the callers check the current directory before forking, this | |
626 | should only return an error if the directory's permissions | |
627 | are changed between the check and this chdir, but we should | |
628 | at least check. */ | |
629 | if (chdir (temp) < 0) | |
630 | exit (errno); | |
7fcf7f05 RS |
631 | |
632 | /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */ | |
633 | while (i > 2 && temp[i - 1] == '/') | |
634 | temp[--i] = 0; | |
e576cab4 | 635 | } |
80856e74 | 636 | |
80856e74 JB |
637 | /* Set `env' to a vector of the strings in Vprocess_environment. */ |
638 | { | |
639 | register Lisp_Object tem; | |
640 | register char **new_env; | |
641 | register int new_length; | |
642 | ||
643 | new_length = 0; | |
644 | for (tem = Vprocess_environment; | |
645 | (XTYPE (tem) == Lisp_Cons | |
646 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
647 | tem = XCONS (tem)->cdr) | |
648 | new_length++; | |
649 | ||
7fcf7f05 RS |
650 | /* new_length + 2 to include PWD and terminating 0. */ |
651 | env = new_env = (char **) alloca ((new_length + 2) * sizeof (char *)); | |
652 | ||
653 | /* If we have a PWD envvar, pass one down, | |
654 | but with corrected value. */ | |
655 | if (getenv ("PWD")) | |
656 | *new_env++ = pwd_var; | |
80856e74 | 657 | |
cd9565ba | 658 | /* Copy the Vprocess_environment strings into new_env. */ |
80856e74 JB |
659 | for (tem = Vprocess_environment; |
660 | (XTYPE (tem) == Lisp_Cons | |
661 | && XTYPE (XCONS (tem)->car) == Lisp_String); | |
662 | tem = XCONS (tem)->cdr) | |
cd9565ba RS |
663 | { |
664 | char **ep = env; | |
665 | char *string = (char *) XSTRING (XCONS (tem)->car)->data; | |
666 | /* See if this string duplicates any string already in the env. | |
667 | If so, don't put it in. | |
668 | When an env var has multiple definitions, | |
669 | we keep the definition that comes first in process-environment. */ | |
670 | for (; ep != new_env; ep++) | |
671 | { | |
672 | char *p = *ep, *q = string; | |
673 | while (1) | |
674 | { | |
675 | if (*q == 0) | |
676 | /* The string is malformed; might as well drop it. */ | |
677 | goto duplicate; | |
678 | if (*q != *p) | |
679 | break; | |
680 | if (*q == '=') | |
681 | goto duplicate; | |
682 | p++, q++; | |
683 | } | |
684 | } | |
685 | *new_env++ = string; | |
686 | duplicate: ; | |
687 | } | |
80856e74 JB |
688 | *new_env = 0; |
689 | } | |
80856e74 | 690 | |
426b37ae JB |
691 | /* Make sure that in, out, and err are not actually already in |
692 | descriptors zero, one, or two; this could happen if Emacs is | |
7e6c2178 | 693 | started with its standard in, out, or error closed, as might |
426b37ae JB |
694 | happen under X. */ |
695 | in = relocate_fd (in, 3); | |
3e9367e7 KH |
696 | if (out == err) |
697 | err = out = relocate_fd (out, 3); | |
698 | else | |
699 | { | |
700 | out = relocate_fd (out, 3); | |
701 | err = relocate_fd (err, 3); | |
702 | } | |
426b37ae | 703 | |
80856e74 JB |
704 | close (0); |
705 | close (1); | |
706 | close (2); | |
707 | ||
708 | dup2 (in, 0); | |
709 | dup2 (out, 1); | |
710 | dup2 (err, 2); | |
711 | close (in); | |
712 | close (out); | |
713 | close (err); | |
714 | ||
fdba8590 RS |
715 | #ifdef USG |
716 | #ifndef SETPGRP_RELEASES_CTTY | |
e576cab4 | 717 | setpgrp (); /* No arguments but equivalent in this case */ |
fdba8590 | 718 | #endif |
e576cab4 JB |
719 | #else |
720 | setpgrp (pid, pid); | |
721 | #endif /* USG */ | |
a129418f RS |
722 | /* setpgrp_of_tty is incorrect here; it uses input_fd. */ |
723 | EMACS_SET_TTY_PGRP (0, &pid); | |
80856e74 JB |
724 | |
725 | #ifdef vipc | |
726 | something missing here; | |
727 | #endif /* vipc */ | |
728 | ||
729 | /* execvp does not accept an environment arg so the only way | |
730 | to pass this environment is to set environ. Our caller | |
731 | is responsible for restoring the ambient value of environ. */ | |
732 | environ = env; | |
733 | execvp (new_argv[0], new_argv); | |
734 | ||
735 | write (1, "Couldn't exec the program ", 26); | |
736 | write (1, new_argv[0], strlen (new_argv[0])); | |
737 | _exit (1); | |
7e6c2178 | 738 | #endif /* not MSDOS */ |
80856e74 JB |
739 | } |
740 | ||
426b37ae JB |
741 | /* Move the file descriptor FD so that its number is not less than MIN. |
742 | If the file descriptor is moved at all, the original is freed. */ | |
743 | int | |
744 | relocate_fd (fd, min) | |
745 | int fd, min; | |
746 | { | |
747 | if (fd >= min) | |
748 | return fd; | |
749 | else | |
750 | { | |
751 | int new = dup (fd); | |
752 | if (new == -1) | |
753 | { | |
20c018a0 | 754 | char *message1 = "Error while setting up child: "; |
826c56ac | 755 | char *errmessage = strerror (errno); |
20c018a0 JB |
756 | char *message2 = "\n"; |
757 | write (2, message1, strlen (message1)); | |
826c56ac | 758 | write (2, errmessage, strlen (errmessage)); |
20c018a0 | 759 | write (2, message2, strlen (message2)); |
426b37ae JB |
760 | _exit (1); |
761 | } | |
762 | /* Note that we hold the original FD open while we recurse, | |
763 | to guarantee we'll get a new FD if we need it. */ | |
764 | new = relocate_fd (new, min); | |
765 | close (fd); | |
766 | return new; | |
767 | } | |
768 | } | |
769 | ||
012c6fcb JA |
770 | static int |
771 | getenv_internal (var, varlen, value, valuelen) | |
772 | char *var; | |
773 | int varlen; | |
774 | char **value; | |
775 | int *valuelen; | |
776 | { | |
777 | Lisp_Object scan; | |
778 | ||
779 | for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr) | |
780 | { | |
c1350752 KH |
781 | Lisp_Object entry; |
782 | ||
783 | entry = XCONS (scan)->car; | |
012c6fcb JA |
784 | if (XTYPE (entry) == Lisp_String |
785 | && XSTRING (entry)->size > varlen | |
786 | && XSTRING (entry)->data[varlen] == '=' | |
787 | && ! bcmp (XSTRING (entry)->data, var, varlen)) | |
788 | { | |
789 | *value = (char *) XSTRING (entry)->data + (varlen + 1); | |
790 | *valuelen = XSTRING (entry)->size - (varlen + 1); | |
791 | return 1; | |
792 | } | |
793 | } | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
0ad477db | 798 | DEFUN ("getenv", Fgetenv, Sgetenv, 1, 1, 0, |
012c6fcb JA |
799 | "Return the value of environment variable VAR, as a string.\n\ |
800 | VAR should be a string. Value is nil if VAR is undefined in the environment.\n\ | |
801 | This function consults the variable ``process-environment'' for its value.") | |
802 | (var) | |
803 | Lisp_Object var; | |
804 | { | |
805 | char *value; | |
806 | int valuelen; | |
807 | ||
808 | CHECK_STRING (var, 0); | |
809 | if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size, | |
810 | &value, &valuelen)) | |
811 | return make_string (value, valuelen); | |
812 | else | |
813 | return Qnil; | |
814 | } | |
815 | ||
816 | /* A version of getenv that consults process_environment, easily | |
e576cab4 | 817 | callable from C. */ |
012c6fcb JA |
818 | char * |
819 | egetenv (var) | |
e576cab4 | 820 | char *var; |
012c6fcb JA |
821 | { |
822 | char *value; | |
823 | int valuelen; | |
824 | ||
825 | if (getenv_internal (var, strlen (var), &value, &valuelen)) | |
826 | return value; | |
827 | else | |
828 | return 0; | |
829 | } | |
830 | ||
80856e74 JB |
831 | #endif /* not VMS */ |
832 | \f | |
8de15d69 | 833 | /* This is run before init_cmdargs. */ |
7e6c2178 | 834 | |
8de15d69 RS |
835 | init_callproc_1 () |
836 | { | |
837 | char *data_dir = egetenv ("EMACSDATA"); | |
35a2f4b8 KH |
838 | char *doc_dir = egetenv ("EMACSDOC"); |
839 | ||
8de15d69 | 840 | Vdata_directory |
7e6c2178 | 841 | = Ffile_name_as_directory (build_string (data_dir ? data_dir |
8de15d69 | 842 | : PATH_DATA)); |
35a2f4b8 KH |
843 | Vdoc_directory |
844 | = Ffile_name_as_directory (build_string (doc_dir ? doc_dir | |
845 | : PATH_DOC)); | |
9453ea7b | 846 | |
e576cab4 JB |
847 | /* Check the EMACSPATH environment variable, defaulting to the |
848 | PATH_EXEC path from paths.h. */ | |
849 | Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC); | |
80856e74 JB |
850 | Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path)); |
851 | Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path); | |
8de15d69 RS |
852 | } |
853 | ||
854 | /* This is run after init_cmdargs, so that Vinvocation_directory is valid. */ | |
855 | ||
856 | init_callproc () | |
857 | { | |
858 | char *data_dir = egetenv ("EMACSDATA"); | |
859 | ||
860 | register char * sh; | |
861 | Lisp_Object tempdir; | |
862 | ||
05630743 | 863 | if (initialized && !NILP (Vinstallation_directory)) |
8de15d69 | 864 | { |
05630743 RS |
865 | /* Add to the path the lib-src subdir of the installation dir. */ |
866 | Lisp_Object tem; | |
867 | tem = Fexpand_file_name (build_string ("lib-src"), | |
868 | Vinstallation_directory); | |
869 | if (NILP (Fmember (tem, Vexec_path))) | |
8de15d69 | 870 | { |
1a6640ec RS |
871 | #ifndef MSDOS |
872 | /* MSDOS uses wrapped binaries, so don't do this. */ | |
8de15d69 RS |
873 | Vexec_path = nconc2 (Vexec_path, Fcons (tem, Qnil)); |
874 | Vexec_directory = Ffile_name_as_directory (tem); | |
1a6640ec | 875 | #endif |
8de15d69 RS |
876 | |
877 | /* If we use ../lib-src, maybe use ../etc as well. | |
878 | Do so if ../etc exists and has our DOC-... file in it. */ | |
879 | if (data_dir == 0) | |
880 | { | |
05630743 RS |
881 | tem = Fexpand_file_name (build_string ("etc"), |
882 | Vinstallation_directory); | |
7e933683 | 883 | Vdoc_directory = Ffile_name_as_directory (tem); |
8de15d69 RS |
884 | } |
885 | } | |
886 | } | |
7e933683 RS |
887 | |
888 | /* Look for the files that should be in etc. We don't use | |
889 | Vinstallation_directory, because these files are never installed | |
890 | in /bin near the executable, and they are never in the build | |
891 | directory when that's different from the source directory. | |
892 | ||
893 | Instead, if these files are not in the nominal place, we try the | |
894 | source directory. */ | |
895 | if (data_dir == 0) | |
896 | { | |
897 | Lisp_Object tem, tem1, newdir; | |
898 | ||
899 | tem = Fexpand_file_name (build_string ("GNU"), Vdata_directory); | |
900 | tem1 = Ffile_exists_p (tem); | |
901 | if (NILP (tem1)) | |
902 | { | |
903 | newdir = Fexpand_file_name (build_string ("../etc/"), | |
904 | build_string (PATH_DUMPLOADSEARCH)); | |
905 | tem = Fexpand_file_name (build_string ("GNU"), newdir); | |
906 | tem1 = Ffile_exists_p (tem); | |
907 | if (!NILP (tem1)) | |
908 | Vdata_directory = newdir; | |
909 | } | |
910 | } | |
80856e74 | 911 | |
e576cab4 JB |
912 | tempdir = Fdirectory_file_name (Vexec_directory); |
913 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
80856e74 | 914 | { |
0af6a831 RS |
915 | fprintf (stderr, |
916 | "Warning: arch-dependent data dir (%s) does not exist.\n", | |
917 | XSTRING (Vexec_directory)->data); | |
80856e74 JB |
918 | sleep (2); |
919 | } | |
920 | ||
e576cab4 JB |
921 | tempdir = Fdirectory_file_name (Vdata_directory); |
922 | if (access (XSTRING (tempdir)->data, 0) < 0) | |
923 | { | |
0af6a831 RS |
924 | fprintf (stderr, |
925 | "Warning: arch-independent data dir (%s) does not exist.\n", | |
926 | XSTRING (Vdata_directory)->data); | |
e576cab4 JB |
927 | sleep (2); |
928 | } | |
929 | ||
80856e74 JB |
930 | #ifdef VMS |
931 | Vshell_file_name = build_string ("*dcl*"); | |
932 | #else | |
e576cab4 | 933 | sh = (char *) getenv ("SHELL"); |
80856e74 JB |
934 | Vshell_file_name = build_string (sh ? sh : "/bin/sh"); |
935 | #endif | |
9fefd2ba JB |
936 | } |
937 | ||
938 | set_process_environment () | |
939 | { | |
940 | register char **envp; | |
80856e74 | 941 | |
80856e74 JB |
942 | Vprocess_environment = Qnil; |
943 | #ifndef CANNOT_DUMP | |
944 | if (initialized) | |
945 | #endif | |
946 | for (envp = environ; *envp; envp++) | |
947 | Vprocess_environment = Fcons (build_string (*envp), | |
948 | Vprocess_environment); | |
80856e74 JB |
949 | } |
950 | ||
951 | syms_of_callproc () | |
952 | { | |
7e6c2178 | 953 | #ifdef MSDOS |
093650fe RS |
954 | Qbuffer_file_type = intern ("buffer-file-type"); |
955 | staticpro (&Qbuffer_file_type); | |
956 | ||
957 | DEFVAR_LISP ("binary-process-input", &Vbinary_process_input, | |
958 | "*If non-nil then new subprocesses are assumed to take binary input."); | |
959 | Vbinary_process_input = Qnil; | |
960 | ||
961 | DEFVAR_LISP ("binary-process-output", &Vbinary_process_output, | |
7e6c2178 | 962 | "*If non-nil then new subprocesses are assumed to produce binary output."); |
093650fe | 963 | Vbinary_process_output = Qnil; |
7e6c2178 RS |
964 | #endif |
965 | ||
80856e74 JB |
966 | DEFVAR_LISP ("shell-file-name", &Vshell_file_name, |
967 | "*File name to load inferior shells from.\n\ | |
968 | Initialized from the SHELL environment variable."); | |
969 | ||
970 | DEFVAR_LISP ("exec-path", &Vexec_path, | |
971 | "*List of directories to search programs to run in subprocesses.\n\ | |
972 | Each element is a string (directory name) or nil (try default directory)."); | |
973 | ||
974 | DEFVAR_LISP ("exec-directory", &Vexec_directory, | |
e576cab4 JB |
975 | "Directory of architecture-dependent files that come with GNU Emacs,\n\ |
976 | especially executable programs intended for Emacs to invoke."); | |
977 | ||
978 | DEFVAR_LISP ("data-directory", &Vdata_directory, | |
979 | "Directory of architecture-independent files that come with GNU Emacs,\n\ | |
980 | intended for Emacs to use."); | |
80856e74 | 981 | |
35a2f4b8 KH |
982 | DEFVAR_LISP ("doc-directory", &Vdoc_directory, |
983 | "Directory containing the DOC file that comes with GNU Emacs.\n\ | |
984 | This is usually the same as data-directory."); | |
985 | ||
ed61592a JB |
986 | DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory, |
987 | "For internal use by the build procedure only.\n\ | |
988 | This is the name of the directory in which the build procedure installed\n\ | |
989 | Emacs's info files; the default value for Info-default-directory-list\n\ | |
990 | includes this."); | |
991 | Vconfigure_info_directory = build_string (PATH_INFO); | |
992 | ||
80856e74 | 993 | DEFVAR_LISP ("process-environment", &Vprocess_environment, |
e576cab4 JB |
994 | "List of environment variables for subprocesses to inherit.\n\ |
995 | Each element should be a string of the form ENVVARNAME=VALUE.\n\ | |
996 | The environment which Emacs inherits is placed in this variable\n\ | |
997 | when Emacs starts."); | |
80856e74 JB |
998 | |
999 | #ifndef VMS | |
1000 | defsubr (&Scall_process); | |
012c6fcb | 1001 | defsubr (&Sgetenv); |
986ffb24 | 1002 | #endif |
e576cab4 | 1003 | defsubr (&Scall_process_region); |
80856e74 | 1004 | } |