Fix drawing of relief rects on X and W32.
[emacs.git] / src / callproc.c
blob167663a45c6a0c592535840ce1a71c42c1593f3a
1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2012
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
21 #include <config.h>
22 #include <errno.h>
23 #include <stdio.h>
24 #include <sys/types.h>
25 #include <unistd.h>
27 #include <sys/file.h>
28 #include <fcntl.h>
30 #include "lisp.h"
32 #ifdef WINDOWSNT
33 #define NOMINMAX
34 #include <windows.h>
35 #include "w32.h"
36 #define _P_NOWAIT 1 /* from process.h */
37 #endif
39 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
40 #include <sys/stat.h>
41 #include <sys/param.h>
42 #endif /* MSDOS */
44 #include "commands.h"
45 #include "character.h"
46 #include "buffer.h"
47 #include "ccl.h"
48 #include "coding.h"
49 #include "composite.h"
50 #include <epaths.h>
51 #include "process.h"
52 #include "syssignal.h"
53 #include "systty.h"
54 #include "syswait.h"
55 #include "blockinput.h"
56 #include "frame.h"
57 #include "termhooks.h"
59 #ifdef MSDOS
60 #include "msdos.h"
61 #endif
63 #ifdef HAVE_NS
64 #include "nsterm.h"
65 #endif
67 /* Pattern used by call-process-region to make temp files. */
68 static Lisp_Object Vtemp_file_name_pattern;
70 /* True if we are about to fork off a synchronous process or if we
71 are waiting for it. */
72 bool synch_process_alive;
74 /* Nonzero => this is a string explaining death of synchronous subprocess. */
75 const char *synch_process_death;
77 /* Nonzero => this is the signal number that terminated the subprocess. */
78 int synch_process_termsig;
80 /* If synch_process_death is zero,
81 this is exit code of synchronous subprocess. */
82 int synch_process_retcode;
85 /* Clean up when exiting Fcall_process.
86 On MSDOS, delete the temporary file on any kind of termination.
87 On Unix, kill the process and any children on termination by signal. */
89 /* True if this is termination due to exit. */
90 static bool call_process_exited;
92 static Lisp_Object
93 call_process_kill (Lisp_Object fdpid)
95 int fd;
96 pid_t pid;
97 CONS_TO_INTEGER (Fcar (fdpid), int, fd);
98 CONS_TO_INTEGER (Fcdr (fdpid), pid_t, pid);
99 emacs_close (fd);
100 EMACS_KILLPG (pid, SIGKILL);
101 synch_process_alive = 0;
102 return Qnil;
105 static Lisp_Object
106 call_process_cleanup (Lisp_Object arg)
108 Lisp_Object fdpid = Fcdr (arg);
109 int fd;
110 #if defined (MSDOS)
111 Lisp_Object file;
112 #else
113 pid_t pid;
114 #endif
116 Fset_buffer (Fcar (arg));
117 CONS_TO_INTEGER (Fcar (fdpid), int, fd);
119 #if defined (MSDOS)
120 /* for MSDOS fdpid is really (fd . tempfile) */
121 file = Fcdr (fdpid);
122 /* FD is -1 and FILE is "" when we didn't actually create a
123 temporary file in call-process. */
124 if (fd >= 0)
125 emacs_close (fd);
126 if (!(strcmp (SDATA (file), NULL_DEVICE) == 0 || SREF (file, 0) == '\0'))
127 unlink (SDATA (file));
128 #else /* not MSDOS */
129 CONS_TO_INTEGER (Fcdr (fdpid), pid_t, pid);
131 if (call_process_exited)
133 emacs_close (fd);
134 return Qnil;
137 if (EMACS_KILLPG (pid, SIGINT) == 0)
139 ptrdiff_t count = SPECPDL_INDEX ();
140 record_unwind_protect (call_process_kill, fdpid);
141 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
142 immediate_quit = 1;
143 QUIT;
144 wait_for_termination (pid);
145 immediate_quit = 0;
146 specpdl_ptr = specpdl + count; /* Discard the unwind protect. */
147 message1 ("Waiting for process to die...done");
149 synch_process_alive = 0;
150 emacs_close (fd);
151 #endif /* not MSDOS */
152 return Qnil;
155 DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
156 doc: /* Call PROGRAM synchronously in separate process.
157 The remaining arguments are optional.
158 The program's input comes from file INFILE (nil means `/dev/null').
159 Insert output in BUFFER before point; t means current buffer; nil for BUFFER
160 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
161 FILE is a file name string, means that it should be written to that file
162 \(if the file already exists it is overwritten).
163 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
164 REAL-BUFFER says what to do with standard output, as above,
165 while STDERR-FILE says what to do with standard error in the child.
166 STDERR-FILE may be nil (discard standard error output),
167 t (mix it with ordinary output), or a file name string.
169 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
170 Remaining arguments are strings passed as command arguments to PROGRAM.
172 If executable PROGRAM can't be found as an executable, `call-process'
173 signals a Lisp error. `call-process' reports errors in execution of
174 the program only through its return and output.
176 If BUFFER is 0, `call-process' returns immediately with value nil.
177 Otherwise it waits for PROGRAM to terminate
178 and returns a numeric exit status or a signal description string.
179 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
181 usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS) */)
182 (ptrdiff_t nargs, Lisp_Object *args)
184 Lisp_Object infile, buffer, current_dir, path, cleanup_info_tail;
185 bool display_p;
186 int fd0, fd1, filefd;
187 ptrdiff_t count = SPECPDL_INDEX ();
188 USE_SAFE_ALLOCA;
190 char **new_argv;
191 /* File to use for stderr in the child.
192 t means use same as standard output. */
193 Lisp_Object error_file;
194 Lisp_Object output_file = Qnil;
195 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
196 char *outf, *tempfile = NULL;
197 int outfilefd;
198 int pid;
199 #else
200 pid_t pid;
201 #endif
202 int vfork_errno;
203 int fd_output = -1;
204 struct coding_system process_coding; /* coding-system of process output */
205 struct coding_system argument_coding; /* coding-system of arguments */
206 /* Set to the return value of Ffind_operation_coding_system. */
207 Lisp_Object coding_systems;
208 bool output_to_buffer = 1;
210 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
211 coding_systems = Qt;
213 CHECK_STRING (args[0]);
215 error_file = Qt;
217 #ifndef subprocesses
218 /* Without asynchronous processes we cannot have BUFFER == 0. */
219 if (nargs >= 3
220 && (INTEGERP (CONSP (args[2]) ? XCAR (args[2]) : args[2])))
221 error ("Operating system cannot handle asynchronous subprocesses");
222 #endif /* subprocesses */
224 /* Decide the coding-system for giving arguments. */
226 Lisp_Object val, *args2;
227 ptrdiff_t i;
229 /* If arguments are supplied, we may have to encode them. */
230 if (nargs >= 5)
232 bool must_encode = 0;
233 Lisp_Object coding_attrs;
235 for (i = 4; i < nargs; i++)
236 CHECK_STRING (args[i]);
238 for (i = 4; i < nargs; i++)
239 if (STRING_MULTIBYTE (args[i]))
240 must_encode = 1;
242 if (!NILP (Vcoding_system_for_write))
243 val = Vcoding_system_for_write;
244 else if (! must_encode)
245 val = Qraw_text;
246 else
248 SAFE_NALLOCA (args2, 1, nargs + 1);
249 args2[0] = Qcall_process;
250 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
251 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
252 val = CONSP (coding_systems) ? XCDR (coding_systems) : Qnil;
254 val = complement_process_encoding_system (val);
255 setup_coding_system (Fcheck_coding_system (val), &argument_coding);
256 coding_attrs = CODING_ID_ATTRS (argument_coding.id);
257 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs)))
259 /* We should not use an ASCII incompatible coding system. */
260 val = raw_text_coding_system (val);
261 setup_coding_system (val, &argument_coding);
266 if (nargs >= 2 && ! NILP (args[1]))
268 infile = Fexpand_file_name (args[1], BVAR (current_buffer, directory));
269 CHECK_STRING (infile);
271 else
272 infile = build_string (NULL_DEVICE);
274 if (nargs >= 3)
276 buffer = args[2];
278 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
279 FILE-FOR-STDERR), unless the first element is :file, in which case see
280 the next paragraph. */
281 if (CONSP (buffer)
282 && (! SYMBOLP (XCAR (buffer))
283 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer))), ":file")))
285 if (CONSP (XCDR (buffer)))
287 Lisp_Object stderr_file;
288 stderr_file = XCAR (XCDR (buffer));
290 if (NILP (stderr_file) || EQ (Qt, stderr_file))
291 error_file = stderr_file;
292 else
293 error_file = Fexpand_file_name (stderr_file, Qnil);
296 buffer = XCAR (buffer);
299 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
300 if (CONSP (buffer)
301 && SYMBOLP (XCAR (buffer))
302 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer))), ":file"))
304 output_file = Fexpand_file_name (XCAR (XCDR (buffer)),
305 BVAR (current_buffer, directory));
306 CHECK_STRING (output_file);
307 buffer = Qnil;
310 if (!(EQ (buffer, Qnil)
311 || EQ (buffer, Qt)
312 || INTEGERP (buffer)))
314 Lisp_Object spec_buffer;
315 spec_buffer = buffer;
316 buffer = Fget_buffer_create (buffer);
317 /* Mention the buffer name for a better error message. */
318 if (NILP (buffer))
319 CHECK_BUFFER (spec_buffer);
320 CHECK_BUFFER (buffer);
323 else
324 buffer = Qnil;
326 /* Make sure that the child will be able to chdir to the current
327 buffer's current directory, or its unhandled equivalent. We
328 can't just have the child check for an error when it does the
329 chdir, since it's in a vfork.
331 We have to GCPRO around this because Fexpand_file_name,
332 Funhandled_file_name_directory, and Ffile_accessible_directory_p
333 might call a file name handling function. The argument list is
334 protected by the caller, so all we really have to worry about is
335 buffer. */
337 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
339 current_dir = BVAR (current_buffer, directory);
341 GCPRO5 (infile, buffer, current_dir, error_file, output_file);
343 current_dir = Funhandled_file_name_directory (current_dir);
344 if (NILP (current_dir))
345 /* If the file name handler says that current_dir is unreachable, use
346 a sensible default. */
347 current_dir = build_string ("~/");
348 current_dir = expand_and_dir_to_file (current_dir, Qnil);
349 current_dir = Ffile_name_as_directory (current_dir);
351 if (NILP (Ffile_accessible_directory_p (current_dir)))
352 report_file_error ("Setting current directory",
353 Fcons (BVAR (current_buffer, directory), Qnil));
355 if (STRING_MULTIBYTE (infile))
356 infile = ENCODE_FILE (infile);
357 if (STRING_MULTIBYTE (current_dir))
358 current_dir = ENCODE_FILE (current_dir);
359 if (STRINGP (error_file) && STRING_MULTIBYTE (error_file))
360 error_file = ENCODE_FILE (error_file);
361 if (STRINGP (output_file) && STRING_MULTIBYTE (output_file))
362 output_file = ENCODE_FILE (output_file);
363 UNGCPRO;
366 display_p = INTERACTIVE && nargs >= 4 && !NILP (args[3]);
368 filefd = emacs_open (SSDATA (infile), O_RDONLY, 0);
369 if (filefd < 0)
371 infile = DECODE_FILE (infile);
372 report_file_error ("Opening process input file", Fcons (infile, Qnil));
375 if (STRINGP (output_file))
377 #ifdef DOS_NT
378 fd_output = emacs_open (SSDATA (output_file),
379 O_WRONLY | O_TRUNC | O_CREAT | O_TEXT,
380 S_IREAD | S_IWRITE);
381 #else /* not DOS_NT */
382 fd_output = creat (SSDATA (output_file), 0666);
383 #endif /* not DOS_NT */
384 if (fd_output < 0)
386 output_file = DECODE_FILE (output_file);
387 report_file_error ("Opening process output file",
388 Fcons (output_file, Qnil));
390 if (STRINGP (error_file) || NILP (error_file))
391 output_to_buffer = 0;
394 /* Search for program; barf if not found. */
396 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
398 GCPRO4 (infile, buffer, current_dir, error_file);
399 openp (Vexec_path, args[0], Vexec_suffixes, &path, make_number (X_OK));
400 UNGCPRO;
402 if (NILP (path))
404 emacs_close (filefd);
405 report_file_error ("Searching for program", Fcons (args[0], Qnil));
408 /* If program file name starts with /: for quoting a magic name,
409 discard that. */
410 if (SBYTES (path) > 2 && SREF (path, 0) == '/'
411 && SREF (path, 1) == ':')
412 path = Fsubstring (path, make_number (2), Qnil);
414 new_argv = SAFE_ALLOCA ((nargs > 4 ? nargs - 2 : 2) * sizeof *new_argv);
415 if (nargs > 4)
417 ptrdiff_t i;
418 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
420 GCPRO5 (infile, buffer, current_dir, path, error_file);
421 argument_coding.dst_multibyte = 0;
422 for (i = 4; i < nargs; i++)
424 argument_coding.src_multibyte = STRING_MULTIBYTE (args[i]);
425 if (CODING_REQUIRE_ENCODING (&argument_coding))
426 /* We must encode this argument. */
427 args[i] = encode_coding_string (&argument_coding, args[i], 1);
429 UNGCPRO;
430 for (i = 4; i < nargs; i++)
431 new_argv[i - 3] = SSDATA (args[i]);
432 new_argv[i - 3] = 0;
434 else
435 new_argv[1] = 0;
436 new_argv[0] = SSDATA (path);
438 #ifdef MSDOS /* MW, July 1993 */
440 /* If we're redirecting STDOUT to a file, that file is already open
441 on fd_output. */
442 if (fd_output < 0)
444 if ((outf = egetenv ("TMPDIR")))
445 strcpy (tempfile = alloca (strlen (outf) + 20), outf);
446 else
448 tempfile = alloca (20);
449 *tempfile = '\0';
451 dostounix_filename (tempfile);
452 if (*tempfile == '\0' || tempfile[strlen (tempfile) - 1] != '/')
453 strcat (tempfile, "/");
454 strcat (tempfile, "detmp.XXX");
455 mktemp (tempfile);
456 outfilefd = creat (tempfile, S_IREAD | S_IWRITE);
457 if (outfilefd < 0) {
458 emacs_close (filefd);
459 report_file_error ("Opening process output file",
460 Fcons (build_string (tempfile), Qnil));
463 else
464 outfilefd = fd_output;
465 fd0 = filefd;
466 fd1 = outfilefd;
467 #endif /* MSDOS */
469 if (INTEGERP (buffer))
471 fd0 = -1;
472 fd1 = emacs_open (NULL_DEVICE, O_WRONLY, 0);
474 else
476 #ifndef MSDOS
477 int fd[2];
478 if (pipe (fd) == -1)
480 int pipe_errno = errno;
481 emacs_close (filefd);
482 errno = pipe_errno;
483 report_file_error ("Creating process pipe", Qnil);
485 fd0 = fd[0];
486 fd1 = fd[1];
487 #endif
491 /* child_setup must clobber environ in systems with true vfork.
492 Protect it from permanent change. */
493 char **save_environ = environ;
494 int fd_error = fd1;
496 if (fd_output >= 0)
497 fd1 = fd_output;
499 /* Record that we're about to create a synchronous process. */
500 synch_process_alive = 1;
502 /* These vars record information from process termination.
503 Clear them now before process can possibly terminate,
504 to avoid timing error if process terminates soon. */
505 synch_process_death = 0;
506 synch_process_retcode = 0;
507 synch_process_termsig = 0;
509 if (NILP (error_file))
510 fd_error = emacs_open (NULL_DEVICE, O_WRONLY, 0);
511 else if (STRINGP (error_file))
513 #ifdef DOS_NT
514 fd_error = emacs_open (SSDATA (error_file),
515 O_WRONLY | O_TRUNC | O_CREAT | O_TEXT,
516 S_IREAD | S_IWRITE);
517 #else /* not DOS_NT */
518 fd_error = creat (SSDATA (error_file), 0666);
519 #endif /* not DOS_NT */
522 if (fd_error < 0)
524 emacs_close (filefd);
525 if (fd0 != filefd)
526 emacs_close (fd0);
527 if (fd1 >= 0)
528 emacs_close (fd1);
529 #ifdef MSDOS
530 unlink (tempfile);
531 #endif
532 if (NILP (error_file))
533 error_file = build_string (NULL_DEVICE);
534 else if (STRINGP (error_file))
535 error_file = DECODE_FILE (error_file);
536 report_file_error ("Cannot redirect stderr", Fcons (error_file, Qnil));
539 #ifdef MSDOS /* MW, July 1993 */
540 /* Note that on MSDOS `child_setup' actually returns the child process
541 exit status, not its PID, so we assign it to `synch_process_retcode'
542 below. */
543 pid = child_setup (filefd, outfilefd, fd_error, new_argv, 0, current_dir);
545 /* Record that the synchronous process exited and note its
546 termination status. */
547 synch_process_alive = 0;
548 synch_process_retcode = pid;
549 if (synch_process_retcode < 0) /* means it couldn't be exec'ed */
551 synchronize_system_messages_locale ();
552 synch_process_death = strerror (errno);
555 emacs_close (outfilefd);
556 if (fd_error != outfilefd)
557 emacs_close (fd_error);
558 fd1 = -1; /* No harm in closing that one! */
559 if (tempfile)
561 /* Since CRLF is converted to LF within `decode_coding', we
562 can always open a file with binary mode. */
563 fd0 = emacs_open (tempfile, O_RDONLY | O_BINARY, 0);
564 if (fd0 < 0)
566 unlink (tempfile);
567 emacs_close (filefd);
568 report_file_error ("Cannot re-open temporary file",
569 Fcons (build_string (tempfile), Qnil));
572 else
573 fd0 = -1; /* We are not going to read from tempfile. */
574 #else /* not MSDOS */
575 #ifdef WINDOWSNT
576 pid = child_setup (filefd, fd1, fd_error, new_argv, 0, current_dir);
577 #else /* not WINDOWSNT */
579 block_input ();
581 /* vfork, and prevent local vars from being clobbered by the vfork. */
583 Lisp_Object volatile buffer_volatile = buffer;
584 Lisp_Object volatile coding_systems_volatile = coding_systems;
585 Lisp_Object volatile current_dir_volatile = current_dir;
586 bool volatile display_p_volatile = display_p;
587 bool volatile output_to_buffer_volatile = output_to_buffer;
588 bool volatile sa_must_free_volatile = sa_must_free;
589 int volatile fd0_volatile = fd0;
590 int volatile fd1_volatile = fd1;
591 int volatile fd_error_volatile = fd_error;
592 int volatile fd_output_volatile = fd_output;
593 int volatile filefd_volatile = filefd;
594 ptrdiff_t volatile count_volatile = count;
595 ptrdiff_t volatile sa_count_volatile = sa_count;
596 char **volatile new_argv_volatile = new_argv;
597 char **volatile new_save_environ = save_environ;
599 pid = vfork ();
601 buffer = buffer_volatile;
602 coding_systems = coding_systems_volatile;
603 current_dir = current_dir_volatile;
604 display_p = display_p_volatile;
605 output_to_buffer = output_to_buffer_volatile;
606 sa_must_free = sa_must_free_volatile;
607 fd0 = fd0_volatile;
608 fd1 = fd1_volatile;
609 fd_error = fd_error_volatile;
610 fd_output = fd_output_volatile;
611 filefd = filefd_volatile;
612 count = count_volatile;
613 sa_count = sa_count_volatile;
614 new_argv = new_argv_volatile;
615 save_environ = new_save_environ;
618 if (pid == 0)
620 if (fd0 >= 0)
621 emacs_close (fd0);
623 setsid ();
625 /* Emacs ignores SIGPIPE, but the child should not. */
626 signal (SIGPIPE, SIG_DFL);
628 child_setup (filefd, fd1, fd_error, new_argv, 0, current_dir);
631 vfork_errno = errno;
632 unblock_input ();
634 #endif /* not WINDOWSNT */
636 /* The MSDOS case did this already. */
637 if (fd_error >= 0)
638 emacs_close (fd_error);
639 #endif /* not MSDOS */
641 environ = save_environ;
643 /* Close most of our file descriptors, but not fd0
644 since we will use that to read input from. */
645 emacs_close (filefd);
646 if (fd_output >= 0)
647 emacs_close (fd_output);
648 if (fd1 >= 0 && fd1 != fd_error)
649 emacs_close (fd1);
652 if (pid < 0)
654 if (fd0 >= 0)
655 emacs_close (fd0);
656 errno = vfork_errno;
657 report_file_error ("Doing vfork", Qnil);
660 if (INTEGERP (buffer))
662 if (fd0 >= 0)
663 emacs_close (fd0);
664 return Qnil;
667 /* Enable sending signal if user quits below. */
668 call_process_exited = 0;
670 #if defined (MSDOS)
671 /* MSDOS needs different cleanup information. */
672 cleanup_info_tail = build_string (tempfile ? tempfile : "");
673 #else
674 cleanup_info_tail = INTEGER_TO_CONS (pid);
675 #endif /* not MSDOS */
676 record_unwind_protect (call_process_cleanup,
677 Fcons (Fcurrent_buffer (),
678 Fcons (INTEGER_TO_CONS (fd0),
679 cleanup_info_tail)));
681 if (BUFFERP (buffer))
682 Fset_buffer (buffer);
684 if (NILP (buffer))
686 /* If BUFFER is nil, we must read process output once and then
687 discard it, so setup coding system but with nil. */
688 setup_coding_system (Qnil, &process_coding);
689 process_coding.dst_multibyte = 0;
691 else
693 Lisp_Object val, *args2;
695 val = Qnil;
696 if (!NILP (Vcoding_system_for_read))
697 val = Vcoding_system_for_read;
698 else
700 if (EQ (coding_systems, Qt))
702 ptrdiff_t i;
704 SAFE_NALLOCA (args2, 1, nargs + 1);
705 args2[0] = Qcall_process;
706 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
707 coding_systems
708 = Ffind_operation_coding_system (nargs + 1, args2);
710 if (CONSP (coding_systems))
711 val = XCAR (coding_systems);
712 else if (CONSP (Vdefault_process_coding_system))
713 val = XCAR (Vdefault_process_coding_system);
714 else
715 val = Qnil;
717 Fcheck_coding_system (val);
718 /* In unibyte mode, character code conversion should not take
719 place but EOL conversion should. So, setup raw-text or one
720 of the subsidiary according to the information just setup. */
721 if (NILP (BVAR (current_buffer, enable_multibyte_characters))
722 && !NILP (val))
723 val = raw_text_coding_system (val);
724 setup_coding_system (val, &process_coding);
725 process_coding.dst_multibyte
726 = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
728 process_coding.src_multibyte = 0;
730 immediate_quit = 1;
731 QUIT;
733 if (output_to_buffer)
735 enum { CALLPROC_BUFFER_SIZE_MIN = 16 * 1024 };
736 enum { CALLPROC_BUFFER_SIZE_MAX = 4 * CALLPROC_BUFFER_SIZE_MIN };
737 char buf[CALLPROC_BUFFER_SIZE_MAX];
738 int bufsize = CALLPROC_BUFFER_SIZE_MIN;
739 int nread;
740 bool first = 1;
741 EMACS_INT total_read = 0;
742 int carryover = 0;
743 bool display_on_the_fly = display_p;
744 struct coding_system saved_coding;
746 saved_coding = process_coding;
747 while (1)
749 /* Repeatedly read until we've filled as much as possible
750 of the buffer size we have. But don't read
751 less than 1024--save that for the next bufferful. */
752 nread = carryover;
753 while (nread < bufsize - 1024)
755 int this_read = emacs_read (fd0, buf + nread,
756 bufsize - nread);
758 if (this_read < 0)
759 goto give_up;
761 if (this_read == 0)
763 process_coding.mode |= CODING_MODE_LAST_BLOCK;
764 break;
767 nread += this_read;
768 total_read += this_read;
770 if (display_on_the_fly)
771 break;
774 /* Now NREAD is the total amount of data in the buffer. */
775 immediate_quit = 0;
777 if (!NILP (buffer))
779 if (NILP (BVAR (current_buffer, enable_multibyte_characters))
780 && ! CODING_MAY_REQUIRE_DECODING (&process_coding))
781 insert_1_both (buf, nread, nread, 0, 1, 0);
782 else
783 { /* We have to decode the input. */
784 Lisp_Object curbuf;
785 ptrdiff_t count1 = SPECPDL_INDEX ();
787 XSETBUFFER (curbuf, current_buffer);
788 /* We cannot allow after-change-functions be run
789 during decoding, because that might modify the
790 buffer, while we rely on process_coding.produced to
791 faithfully reflect inserted text until we
792 TEMP_SET_PT_BOTH below. */
793 specbind (Qinhibit_modification_hooks, Qt);
794 decode_coding_c_string (&process_coding,
795 (unsigned char *) buf, nread, curbuf);
796 unbind_to (count1, Qnil);
797 if (display_on_the_fly
798 && CODING_REQUIRE_DETECTION (&saved_coding)
799 && ! CODING_REQUIRE_DETECTION (&process_coding))
801 /* We have detected some coding system. But,
802 there's a possibility that the detection was
803 done by insufficient data. So, we give up
804 displaying on the fly. */
805 if (process_coding.produced > 0)
806 del_range_2 (process_coding.dst_pos,
807 process_coding.dst_pos_byte,
808 process_coding.dst_pos
809 + process_coding.produced_char,
810 process_coding.dst_pos_byte
811 + process_coding.produced, 0);
812 display_on_the_fly = 0;
813 process_coding = saved_coding;
814 carryover = nread;
815 /* This is to make the above condition always
816 fails in the future. */
817 saved_coding.common_flags
818 &= ~CODING_REQUIRE_DETECTION_MASK;
819 continue;
822 TEMP_SET_PT_BOTH (PT + process_coding.produced_char,
823 PT_BYTE + process_coding.produced);
824 carryover = process_coding.carryover_bytes;
825 if (carryover > 0)
826 memcpy (buf, process_coding.carryover,
827 process_coding.carryover_bytes);
831 if (process_coding.mode & CODING_MODE_LAST_BLOCK)
832 break;
834 /* Make the buffer bigger as we continue to read more data,
835 but not past CALLPROC_BUFFER_SIZE_MAX. */
836 if (bufsize < CALLPROC_BUFFER_SIZE_MAX && total_read > 32 * bufsize)
837 if ((bufsize *= 2) > CALLPROC_BUFFER_SIZE_MAX)
838 bufsize = CALLPROC_BUFFER_SIZE_MAX;
840 if (display_p)
842 if (first)
843 prepare_menu_bars ();
844 first = 0;
845 redisplay_preserve_echo_area (1);
846 /* This variable might have been set to 0 for code
847 detection. In that case, we set it back to 1 because
848 we should have already detected a coding system. */
849 display_on_the_fly = 1;
851 immediate_quit = 1;
852 QUIT;
854 give_up: ;
856 Vlast_coding_system_used = CODING_ID_NAME (process_coding.id);
857 /* If the caller required, let the buffer inherit the
858 coding-system used to decode the process output. */
859 if (inherit_process_coding_system)
860 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
861 make_number (total_read));
864 #ifndef MSDOS
865 /* Wait for it to terminate, unless it already has. */
866 if (output_to_buffer)
867 wait_for_termination (pid);
868 else
869 interruptible_wait_for_termination (pid);
870 #endif
872 immediate_quit = 0;
874 /* Don't kill any children that the subprocess may have left behind
875 when exiting. */
876 call_process_exited = 1;
878 SAFE_FREE ();
879 unbind_to (count, Qnil);
881 if (synch_process_termsig)
883 const char *signame;
885 synchronize_system_messages_locale ();
886 signame = strsignal (synch_process_termsig);
888 if (signame == 0)
889 signame = "unknown";
891 synch_process_death = signame;
894 if (synch_process_death)
895 return code_convert_string_norecord (build_string (synch_process_death),
896 Vlocale_coding_system, 0);
897 return make_number (synch_process_retcode);
900 static Lisp_Object
901 delete_temp_file (Lisp_Object name)
903 /* Suppress jka-compr handling, etc. */
904 ptrdiff_t count = SPECPDL_INDEX ();
905 specbind (intern ("file-name-handler-alist"), Qnil);
906 internal_delete_file (name);
907 unbind_to (count, Qnil);
908 return Qnil;
911 DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
912 3, MANY, 0,
913 doc: /* Send text from START to END to a synchronous process running PROGRAM.
914 The remaining arguments are optional.
915 Delete the text if fourth arg DELETE is non-nil.
917 Insert output in BUFFER before point; t means current buffer; nil for
918 BUFFER means discard it; 0 means discard and don't wait; and `(:file
919 FILE)', where FILE is a file name string, means that it should be
920 written to that file (if the file already exists it is overwritten).
921 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
922 REAL-BUFFER says what to do with standard output, as above,
923 while STDERR-FILE says what to do with standard error in the child.
924 STDERR-FILE may be nil (discard standard error output),
925 t (mix it with ordinary output), or a file name string.
927 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
928 Remaining args are passed to PROGRAM at startup as command args.
930 If BUFFER is 0, `call-process-region' returns immediately with value nil.
931 Otherwise it waits for PROGRAM to terminate
932 and returns a numeric exit status or a signal description string.
933 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
935 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
936 (ptrdiff_t nargs, Lisp_Object *args)
938 struct gcpro gcpro1;
939 Lisp_Object filename_string;
940 register Lisp_Object start, end;
941 ptrdiff_t count = SPECPDL_INDEX ();
942 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
943 Lisp_Object coding_systems;
944 Lisp_Object val, *args2;
945 ptrdiff_t i;
946 Lisp_Object tmpdir;
948 if (STRINGP (Vtemporary_file_directory))
949 tmpdir = Vtemporary_file_directory;
950 else
952 #ifndef DOS_NT
953 if (getenv ("TMPDIR"))
954 tmpdir = build_string (getenv ("TMPDIR"));
955 else
956 tmpdir = build_string ("/tmp/");
957 #else /* DOS_NT */
958 char *outf;
959 if ((outf = egetenv ("TMPDIR"))
960 || (outf = egetenv ("TMP"))
961 || (outf = egetenv ("TEMP")))
962 tmpdir = build_string (outf);
963 else
964 tmpdir = Ffile_name_as_directory (build_string ("c:/temp"));
965 #endif
969 USE_SAFE_ALLOCA;
970 Lisp_Object pattern = Fexpand_file_name (Vtemp_file_name_pattern, tmpdir);
971 char *tempfile = SAFE_ALLOCA (SBYTES (pattern) + 1);
972 memcpy (tempfile, SDATA (pattern), SBYTES (pattern) + 1);
973 coding_systems = Qt;
975 #ifdef HAVE_MKSTEMP
977 int fd;
979 block_input ();
980 fd = mkstemp (tempfile);
981 unblock_input ();
982 if (fd == -1)
983 report_file_error ("Failed to open temporary file",
984 Fcons (build_string (tempfile), Qnil));
985 else
986 close (fd);
988 #else
989 mktemp (tempfile);
990 #endif
992 filename_string = build_string (tempfile);
993 GCPRO1 (filename_string);
994 SAFE_FREE ();
997 start = args[0];
998 end = args[1];
999 /* Decide coding-system of the contents of the temporary file. */
1000 if (!NILP (Vcoding_system_for_write))
1001 val = Vcoding_system_for_write;
1002 else if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
1003 val = Qraw_text;
1004 else
1006 USE_SAFE_ALLOCA;
1007 SAFE_NALLOCA (args2, 1, nargs + 1);
1008 args2[0] = Qcall_process_region;
1009 for (i = 0; i < nargs; i++) args2[i + 1] = args[i];
1010 coding_systems = Ffind_operation_coding_system (nargs + 1, args2);
1011 val = CONSP (coding_systems) ? XCDR (coding_systems) : Qnil;
1012 SAFE_FREE ();
1014 val = complement_process_encoding_system (val);
1017 ptrdiff_t count1 = SPECPDL_INDEX ();
1019 specbind (intern ("coding-system-for-write"), val);
1020 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1021 happen to get a ".Z" suffix. */
1022 specbind (intern ("file-name-handler-alist"), Qnil);
1023 Fwrite_region (start, end, filename_string, Qnil, Qlambda, Qnil, Qnil);
1025 unbind_to (count1, Qnil);
1028 /* Note that Fcall_process takes care of binding
1029 coding-system-for-read. */
1031 record_unwind_protect (delete_temp_file, filename_string);
1033 if (nargs > 3 && !NILP (args[3]))
1034 Fdelete_region (start, end);
1036 if (nargs > 3)
1038 args += 2;
1039 nargs -= 2;
1041 else
1043 args[0] = args[2];
1044 nargs = 2;
1046 args[1] = filename_string;
1048 RETURN_UNGCPRO (unbind_to (count, Fcall_process (nargs, args)));
1051 #ifndef WINDOWSNT
1052 static int relocate_fd (int fd, int minfd);
1053 #endif
1055 static char **
1056 add_env (char **env, char **new_env, char *string)
1058 char **ep;
1059 bool ok = 1;
1060 if (string == NULL)
1061 return new_env;
1063 /* See if this string duplicates any string already in the env.
1064 If so, don't put it in.
1065 When an env var has multiple definitions,
1066 we keep the definition that comes first in process-environment. */
1067 for (ep = env; ok && ep != new_env; ep++)
1069 char *p = *ep, *q = string;
1070 while (ok)
1072 if (*q != *p)
1073 break;
1074 if (*q == 0)
1075 /* The string is a lone variable name; keep it for now, we
1076 will remove it later. It is a placeholder for a
1077 variable that is not to be included in the environment. */
1078 break;
1079 if (*q == '=')
1080 ok = 0;
1081 p++, q++;
1084 if (ok)
1085 *new_env++ = string;
1086 return new_env;
1089 /* This is the last thing run in a newly forked inferior
1090 either synchronous or asynchronous.
1091 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1092 Initialize inferior's priority, pgrp, connected dir and environment.
1093 then exec another program based on new_argv.
1095 This function may change environ for the superior process.
1096 Therefore, the superior process must save and restore the value
1097 of environ around the vfork and the call to this function.
1099 If SET_PGRP, put the subprocess into a separate process group.
1101 CURRENT_DIR is an elisp string giving the path of the current
1102 directory the subprocess should have. Since we can't really signal
1103 a decent error from within the child, this should be verified as an
1104 executable directory by the parent. */
1107 child_setup (int in, int out, int err, char **new_argv, bool set_pgrp,
1108 Lisp_Object current_dir)
1110 char **env;
1111 char *pwd_var;
1112 #ifdef WINDOWSNT
1113 int cpid;
1114 HANDLE handles[3];
1115 #endif /* WINDOWSNT */
1117 pid_t pid = getpid ();
1119 /* Close Emacs's descriptors that this process should not have. */
1120 close_process_descs ();
1122 /* DOS_NT isn't in a vfork, so if we are in the middle of load-file,
1123 we will lose if we call close_load_descs here. */
1124 #ifndef DOS_NT
1125 close_load_descs ();
1126 #endif
1128 /* Note that use of alloca is always safe here. It's obvious for systems
1129 that do not have true vfork or that have true (stack) alloca.
1130 If using vfork and C_ALLOCA (when Emacs used to include
1131 src/alloca.c) it is safe because that changes the superior's
1132 static variables as if the superior had done alloca and will be
1133 cleaned up in the usual way. */
1135 register char *temp;
1136 size_t i; /* size_t, because ptrdiff_t might overflow here! */
1138 i = SBYTES (current_dir);
1139 #ifdef MSDOS
1140 /* MSDOS must have all environment variables malloc'ed, because
1141 low-level libc functions that launch subsidiary processes rely
1142 on that. */
1143 pwd_var = xmalloc (i + 6);
1144 #else
1145 pwd_var = alloca (i + 6);
1146 #endif
1147 temp = pwd_var + 4;
1148 memcpy (pwd_var, "PWD=", 4);
1149 memcpy (temp, SDATA (current_dir), i);
1150 if (!IS_DIRECTORY_SEP (temp[i - 1])) temp[i++] = DIRECTORY_SEP;
1151 temp[i] = 0;
1153 #ifndef DOS_NT
1154 /* We can't signal an Elisp error here; we're in a vfork. Since
1155 the callers check the current directory before forking, this
1156 should only return an error if the directory's permissions
1157 are changed between the check and this chdir, but we should
1158 at least check. */
1159 if (chdir (temp) < 0)
1160 _exit (errno);
1161 #else /* DOS_NT */
1162 /* Get past the drive letter, so that d:/ is left alone. */
1163 if (i > 2 && IS_DEVICE_SEP (temp[1]) && IS_DIRECTORY_SEP (temp[2]))
1165 temp += 2;
1166 i -= 2;
1168 #endif /* DOS_NT */
1170 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1171 while (i > 2 && IS_DIRECTORY_SEP (temp[i - 1]))
1172 temp[--i] = 0;
1175 /* Set `env' to a vector of the strings in the environment. */
1177 register Lisp_Object tem;
1178 register char **new_env;
1179 char **p, **q;
1180 register int new_length;
1181 Lisp_Object display = Qnil;
1183 new_length = 0;
1185 for (tem = Vprocess_environment;
1186 CONSP (tem) && STRINGP (XCAR (tem));
1187 tem = XCDR (tem))
1189 if (strncmp (SSDATA (XCAR (tem)), "DISPLAY", 7) == 0
1190 && (SDATA (XCAR (tem)) [7] == '\0'
1191 || SDATA (XCAR (tem)) [7] == '='))
1192 /* DISPLAY is specified in process-environment. */
1193 display = Qt;
1194 new_length++;
1197 /* If not provided yet, use the frame's DISPLAY. */
1198 if (NILP (display))
1200 Lisp_Object tmp = Fframe_parameter (selected_frame, Qdisplay);
1201 if (!STRINGP (tmp) && CONSP (Vinitial_environment))
1202 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1203 tmp = Fgetenv_internal (build_string ("DISPLAY"),
1204 Vinitial_environment);
1205 if (STRINGP (tmp))
1207 display = tmp;
1208 new_length++;
1212 /* new_length + 2 to include PWD and terminating 0. */
1213 env = new_env = alloca ((new_length + 2) * sizeof *env);
1214 /* If we have a PWD envvar, pass one down,
1215 but with corrected value. */
1216 if (egetenv ("PWD"))
1217 *new_env++ = pwd_var;
1219 if (STRINGP (display))
1221 char *vdata = alloca (sizeof "DISPLAY=" + SBYTES (display));
1222 strcpy (vdata, "DISPLAY=");
1223 strcat (vdata, SSDATA (display));
1224 new_env = add_env (env, new_env, vdata);
1227 /* Overrides. */
1228 for (tem = Vprocess_environment;
1229 CONSP (tem) && STRINGP (XCAR (tem));
1230 tem = XCDR (tem))
1231 new_env = add_env (env, new_env, SSDATA (XCAR (tem)));
1233 *new_env = 0;
1235 /* Remove variable names without values. */
1236 p = q = env;
1237 while (*p != 0)
1239 while (*q != 0 && strchr (*q, '=') == NULL)
1240 q++;
1241 *p = *q++;
1242 if (*p != 0)
1243 p++;
1248 #ifdef WINDOWSNT
1249 prepare_standard_handles (in, out, err, handles);
1250 set_process_dir (SDATA (current_dir));
1251 /* Spawn the child. (See ntproc.c:Spawnve). */
1252 cpid = spawnve (_P_NOWAIT, new_argv[0], new_argv, env);
1253 reset_standard_handles (in, out, err, handles);
1254 if (cpid == -1)
1255 /* An error occurred while trying to spawn the process. */
1256 report_file_error ("Spawning child process", Qnil);
1257 return cpid;
1259 #else /* not WINDOWSNT */
1260 /* Make sure that in, out, and err are not actually already in
1261 descriptors zero, one, or two; this could happen if Emacs is
1262 started with its standard in, out, or error closed, as might
1263 happen under X. */
1265 int oin = in, oout = out;
1267 /* We have to avoid relocating the same descriptor twice! */
1269 in = relocate_fd (in, 3);
1271 if (out == oin)
1272 out = in;
1273 else
1274 out = relocate_fd (out, 3);
1276 if (err == oin)
1277 err = in;
1278 else if (err == oout)
1279 err = out;
1280 else
1281 err = relocate_fd (err, 3);
1284 #ifndef MSDOS
1285 emacs_close (0);
1286 emacs_close (1);
1287 emacs_close (2);
1289 dup2 (in, 0);
1290 dup2 (out, 1);
1291 dup2 (err, 2);
1292 emacs_close (in);
1293 if (out != in)
1294 emacs_close (out);
1295 if (err != in && err != out)
1296 emacs_close (err);
1298 setpgid (0, 0);
1299 tcsetpgrp (0, pid);
1301 /* execvp does not accept an environment arg so the only way
1302 to pass this environment is to set environ. Our caller
1303 is responsible for restoring the ambient value of environ. */
1304 environ = env;
1305 execvp (new_argv[0], new_argv);
1307 emacs_write (1, "Can't exec program: ", 20);
1308 emacs_write (1, new_argv[0], strlen (new_argv[0]));
1309 emacs_write (1, "\n", 1);
1310 _exit (1);
1312 #else /* MSDOS */
1313 pid = run_msdos_command (new_argv, pwd_var + 4, in, out, err, env);
1314 xfree (pwd_var);
1315 if (pid == -1)
1316 /* An error occurred while trying to run the subprocess. */
1317 report_file_error ("Spawning child process", Qnil);
1318 return pid;
1319 #endif /* MSDOS */
1320 #endif /* not WINDOWSNT */
1323 #ifndef WINDOWSNT
1324 /* Move the file descriptor FD so that its number is not less than MINFD.
1325 If the file descriptor is moved at all, the original is freed. */
1326 static int
1327 relocate_fd (int fd, int minfd)
1329 if (fd >= minfd)
1330 return fd;
1331 else
1333 int new = fcntl (fd, F_DUPFD, minfd);
1334 if (new == -1)
1336 const char *message_1 = "Error while setting up child: ";
1337 const char *errmessage = strerror (errno);
1338 const char *message_2 = "\n";
1339 emacs_write (2, message_1, strlen (message_1));
1340 emacs_write (2, errmessage, strlen (errmessage));
1341 emacs_write (2, message_2, strlen (message_2));
1342 _exit (1);
1344 emacs_close (fd);
1345 return new;
1348 #endif /* not WINDOWSNT */
1350 static bool
1351 getenv_internal_1 (const char *var, ptrdiff_t varlen, char **value,
1352 ptrdiff_t *valuelen, Lisp_Object env)
1354 for (; CONSP (env); env = XCDR (env))
1356 Lisp_Object entry = XCAR (env);
1357 if (STRINGP (entry)
1358 && SBYTES (entry) >= varlen
1359 #ifdef WINDOWSNT
1360 /* NT environment variables are case insensitive. */
1361 && ! strnicmp (SDATA (entry), var, varlen)
1362 #else /* not WINDOWSNT */
1363 && ! memcmp (SDATA (entry), var, varlen)
1364 #endif /* not WINDOWSNT */
1367 if (SBYTES (entry) > varlen && SREF (entry, varlen) == '=')
1369 *value = SSDATA (entry) + (varlen + 1);
1370 *valuelen = SBYTES (entry) - (varlen + 1);
1371 return 1;
1373 else if (SBYTES (entry) == varlen)
1375 /* Lone variable names in Vprocess_environment mean that
1376 variable should be removed from the environment. */
1377 *value = NULL;
1378 return 1;
1382 return 0;
1385 static bool
1386 getenv_internal (const char *var, ptrdiff_t varlen, char **value,
1387 ptrdiff_t *valuelen, Lisp_Object frame)
1389 /* Try to find VAR in Vprocess_environment first. */
1390 if (getenv_internal_1 (var, varlen, value, valuelen,
1391 Vprocess_environment))
1392 return *value ? 1 : 0;
1394 /* For DISPLAY try to get the values from the frame or the initial env. */
1395 if (strcmp (var, "DISPLAY") == 0)
1397 Lisp_Object display
1398 = Fframe_parameter (NILP (frame) ? selected_frame : frame, Qdisplay);
1399 if (STRINGP (display))
1401 *value = SSDATA (display);
1402 *valuelen = SBYTES (display);
1403 return 1;
1405 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1406 if (getenv_internal_1 (var, varlen, value, valuelen,
1407 Vinitial_environment))
1408 return *value ? 1 : 0;
1411 return 0;
1414 DEFUN ("getenv-internal", Fgetenv_internal, Sgetenv_internal, 1, 2, 0,
1415 doc: /* Get the value of environment variable VARIABLE.
1416 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1417 the environment. Otherwise, value is a string.
1419 This function searches `process-environment' for VARIABLE.
1421 If optional parameter ENV is a list, then search this list instead of
1422 `process-environment', and return t when encountering a negative entry
1423 \(an entry for a variable with no value). */)
1424 (Lisp_Object variable, Lisp_Object env)
1426 char *value;
1427 ptrdiff_t valuelen;
1429 CHECK_STRING (variable);
1430 if (CONSP (env))
1432 if (getenv_internal_1 (SSDATA (variable), SBYTES (variable),
1433 &value, &valuelen, env))
1434 return value ? make_string (value, valuelen) : Qt;
1435 else
1436 return Qnil;
1438 else if (getenv_internal (SSDATA (variable), SBYTES (variable),
1439 &value, &valuelen, env))
1440 return make_string (value, valuelen);
1441 else
1442 return Qnil;
1445 /* A version of getenv that consults the Lisp environment lists,
1446 easily callable from C. */
1447 char *
1448 egetenv (const char *var)
1450 char *value;
1451 ptrdiff_t valuelen;
1453 if (getenv_internal (var, strlen (var), &value, &valuelen, Qnil))
1454 return value;
1455 else
1456 return 0;
1460 /* This is run before init_cmdargs. */
1462 void
1463 init_callproc_1 (void)
1465 #ifdef HAVE_NS
1466 const char *etc_dir = ns_etc_directory ();
1467 const char *path_exec = ns_exec_path ();
1468 #endif
1470 Vdata_directory = decode_env_path ("EMACSDATA",
1471 #ifdef HAVE_NS
1472 etc_dir ? etc_dir :
1473 #endif
1474 PATH_DATA);
1475 Vdata_directory = Ffile_name_as_directory (Fcar (Vdata_directory));
1477 Vdoc_directory = decode_env_path ("EMACSDOC",
1478 #ifdef HAVE_NS
1479 etc_dir ? etc_dir :
1480 #endif
1481 PATH_DOC);
1482 Vdoc_directory = Ffile_name_as_directory (Fcar (Vdoc_directory));
1484 /* Check the EMACSPATH environment variable, defaulting to the
1485 PATH_EXEC path from epaths.h. */
1486 Vexec_path = decode_env_path ("EMACSPATH",
1487 #ifdef HAVE_NS
1488 path_exec ? path_exec :
1489 #endif
1490 PATH_EXEC);
1491 Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path));
1492 /* FIXME? For ns, path_exec should go at the front? */
1493 Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
1496 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1498 void
1499 init_callproc (void)
1501 char *data_dir = egetenv ("EMACSDATA");
1503 register char * sh;
1504 Lisp_Object tempdir;
1505 #ifdef HAVE_NS
1506 if (data_dir == 0)
1508 const char *etc_dir = ns_etc_directory ();
1509 if (etc_dir)
1511 data_dir = alloca (strlen (etc_dir) + 1);
1512 strcpy (data_dir, etc_dir);
1515 #endif
1517 if (!NILP (Vinstallation_directory))
1519 /* Add to the path the lib-src subdir of the installation dir. */
1520 Lisp_Object tem;
1521 tem = Fexpand_file_name (build_string ("lib-src"),
1522 Vinstallation_directory);
1523 #ifndef MSDOS
1524 /* MSDOS uses wrapped binaries, so don't do this. */
1525 if (NILP (Fmember (tem, Vexec_path)))
1527 #ifdef HAVE_NS
1528 const char *path_exec = ns_exec_path ();
1529 #endif
1530 Vexec_path = decode_env_path ("EMACSPATH",
1531 #ifdef HAVE_NS
1532 path_exec ? path_exec :
1533 #endif
1534 PATH_EXEC);
1535 Vexec_path = Fcons (tem, Vexec_path);
1536 Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
1539 Vexec_directory = Ffile_name_as_directory (tem);
1540 #endif /* not MSDOS */
1542 /* Maybe use ../etc as well as ../lib-src. */
1543 if (data_dir == 0)
1545 tem = Fexpand_file_name (build_string ("etc"),
1546 Vinstallation_directory);
1547 Vdoc_directory = Ffile_name_as_directory (tem);
1551 /* Look for the files that should be in etc. We don't use
1552 Vinstallation_directory, because these files are never installed
1553 near the executable, and they are never in the build
1554 directory when that's different from the source directory.
1556 Instead, if these files are not in the nominal place, we try the
1557 source directory. */
1558 if (data_dir == 0)
1560 Lisp_Object tem, tem1, srcdir;
1562 srcdir = Fexpand_file_name (build_string ("../src/"),
1563 build_string (PATH_DUMPLOADSEARCH));
1564 tem = Fexpand_file_name (build_string ("GNU"), Vdata_directory);
1565 tem1 = Ffile_exists_p (tem);
1566 if (!NILP (Fequal (srcdir, Vinvocation_directory)) || NILP (tem1))
1568 Lisp_Object newdir;
1569 newdir = Fexpand_file_name (build_string ("../etc/"),
1570 build_string (PATH_DUMPLOADSEARCH));
1571 tem = Fexpand_file_name (build_string ("GNU"), newdir);
1572 tem1 = Ffile_exists_p (tem);
1573 if (!NILP (tem1))
1574 Vdata_directory = newdir;
1578 #ifndef CANNOT_DUMP
1579 if (initialized)
1580 #endif
1582 tempdir = Fdirectory_file_name (Vexec_directory);
1583 if (! file_accessible_directory_p (SSDATA (tempdir)))
1584 dir_warning ("arch-dependent data dir", Vexec_directory);
1587 tempdir = Fdirectory_file_name (Vdata_directory);
1588 if (! file_accessible_directory_p (SSDATA (tempdir)))
1589 dir_warning ("arch-independent data dir", Vdata_directory);
1591 sh = (char *) getenv ("SHELL");
1592 Vshell_file_name = build_string (sh ? sh : "/bin/sh");
1594 #ifdef DOS_NT
1595 Vshared_game_score_directory = Qnil;
1596 #else
1597 Vshared_game_score_directory = build_string (PATH_GAME);
1598 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory)))
1599 Vshared_game_score_directory = Qnil;
1600 #endif
1603 void
1604 set_initial_environment (void)
1606 char **envp;
1607 for (envp = environ; *envp; envp++)
1608 Vprocess_environment = Fcons (build_string (*envp),
1609 Vprocess_environment);
1610 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1611 to use `delete' and friends on process-environment. */
1612 Vinitial_environment = Fcopy_sequence (Vprocess_environment);
1615 void
1616 syms_of_callproc (void)
1618 #ifndef DOS_NT
1619 Vtemp_file_name_pattern = build_string ("emacsXXXXXX");
1620 #elif defined (WINDOWSNT)
1621 Vtemp_file_name_pattern = build_string ("emXXXXXX");
1622 #else
1623 Vtemp_file_name_pattern = build_string ("detmp.XXX");
1624 #endif
1625 staticpro (&Vtemp_file_name_pattern);
1627 DEFVAR_LISP ("shell-file-name", Vshell_file_name,
1628 doc: /* File name to load inferior shells from.
1629 Initialized from the SHELL environment variable, or to a system-dependent
1630 default if SHELL is not set. */);
1632 DEFVAR_LISP ("exec-path", Vexec_path,
1633 doc: /* List of directories to search programs to run in subprocesses.
1634 Each element is a string (directory name) or nil (try default directory). */);
1636 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes,
1637 doc: /* List of suffixes to try to find executable file names.
1638 Each element is a string. */);
1639 Vexec_suffixes = Qnil;
1641 DEFVAR_LISP ("exec-directory", Vexec_directory,
1642 doc: /* Directory for executables for Emacs to invoke.
1643 More generally, this includes any architecture-dependent files
1644 that are built and installed from the Emacs distribution. */);
1646 DEFVAR_LISP ("data-directory", Vdata_directory,
1647 doc: /* Directory of machine-independent files that come with GNU Emacs.
1648 These are files intended for Emacs to use while it runs. */);
1650 DEFVAR_LISP ("doc-directory", Vdoc_directory,
1651 doc: /* Directory containing the DOC file that comes with GNU Emacs.
1652 This is usually the same as `data-directory'. */);
1654 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory,
1655 doc: /* For internal use by the build procedure only.
1656 This is the name of the directory in which the build procedure installed
1657 Emacs's info files; the default value for `Info-default-directory-list'
1658 includes this. */);
1659 Vconfigure_info_directory = build_string (PATH_INFO);
1661 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory,
1662 doc: /* Directory of score files for games which come with GNU Emacs.
1663 If this variable is nil, then Emacs is unable to use a shared directory. */);
1664 #ifdef DOS_NT
1665 Vshared_game_score_directory = Qnil;
1666 #else
1667 Vshared_game_score_directory = build_string (PATH_GAME);
1668 #endif
1670 DEFVAR_LISP ("initial-environment", Vinitial_environment,
1671 doc: /* List of environment variables inherited from the parent process.
1672 Each element should be a string of the form ENVVARNAME=VALUE.
1673 The elements must normally be decoded (using `locale-coding-system') for use. */);
1674 Vinitial_environment = Qnil;
1676 DEFVAR_LISP ("process-environment", Vprocess_environment,
1677 doc: /* List of overridden environment variables for subprocesses to inherit.
1678 Each element should be a string of the form ENVVARNAME=VALUE.
1680 Entries in this list take precedence to those in the frame-local
1681 environments. Therefore, let-binding `process-environment' is an easy
1682 way to temporarily change the value of an environment variable,
1683 irrespective of where it comes from. To use `process-environment' to
1684 remove an environment variable, include only its name in the list,
1685 without "=VALUE".
1687 This variable is set to nil when Emacs starts.
1689 If multiple entries define the same variable, the first one always
1690 takes precedence.
1692 Non-ASCII characters are encoded according to the initial value of
1693 `locale-coding-system', i.e. the elements must normally be decoded for
1694 use.
1696 See `setenv' and `getenv'. */);
1697 Vprocess_environment = Qnil;
1699 defsubr (&Scall_process);
1700 defsubr (&Sgetenv_internal);
1701 defsubr (&Scall_process_region);