1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2013
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/>. */
24 #include <sys/types.h>
34 #include <sys/socket.h> /* for fcntl */
37 #define _P_NOWAIT 1 /* from process.h */
40 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
42 #include <sys/param.h>
46 #include "character.h"
50 #include "composite.h"
53 #include "syssignal.h"
56 #include "blockinput.h"
58 #include "termhooks.h"
68 /* Pattern used by call-process-region to make temp files. */
69 static Lisp_Object Vtemp_file_name_pattern
;
71 /* The next two variables are valid only while record-unwind-protect
72 is in place during call-process for a synchronous subprocess. At
73 other times, their contents are irrelevant. Doing this via static
74 C variables is more convenient than putting them into the arguments
75 of record-unwind-protect, as they need to be updated at randomish
76 times in the code, and Lisp cannot always store these values as
77 Emacs integers. It's safe to use static variables here, as the
78 code is never invoked reentrantly. */
80 /* If nonzero, a process-ID that has not been reaped. */
81 static pid_t synch_process_pid
;
83 /* If nonnegative, a file descriptor that has not been closed. */
84 static int synch_process_fd
;
89 block_child_signal (void)
92 sigemptyset (&blocked
);
93 sigaddset (&blocked
, SIGCHLD
);
94 pthread_sigmask (SIG_BLOCK
, &blocked
, 0);
97 /* Unblock SIGCHLD. */
100 unblock_child_signal (void)
102 pthread_sigmask (SIG_SETMASK
, &empty_mask
, 0);
105 /* If P is reapable, record it as a deleted process and kill it.
106 Do this in a critical section. Unless PID is wedged it will be
107 reaped on receipt of the first SIGCHLD after the critical section. */
110 record_kill_process (struct Lisp_Process
*p
)
112 block_child_signal ();
117 record_deleted_pid (p
->pid
);
118 kill (- p
->pid
, SIGKILL
);
121 unblock_child_signal ();
124 /* Clean up when exiting call_process_cleanup. */
127 call_process_kill (void)
129 if (synch_process_fd
>= 0)
130 emacs_close (synch_process_fd
);
132 if (synch_process_pid
)
134 struct Lisp_Process proc
;
136 proc
.pid
= synch_process_pid
;
137 record_kill_process (&proc
);
141 /* Clean up when exiting Fcall_process.
142 On MSDOS, delete the temporary file on any kind of termination.
143 On Unix, kill the process and any children on termination by signal. */
146 call_process_cleanup (Lisp_Object arg
)
149 Lisp_Object buffer
= Fcar (arg
);
150 Lisp_Object file
= Fcdr (arg
);
152 Lisp_Object buffer
= arg
;
155 Fset_buffer (buffer
);
158 /* If the process still exists, kill its process group. */
159 if (synch_process_pid
)
161 ptrdiff_t count
= SPECPDL_INDEX ();
162 kill (-synch_process_pid
, SIGINT
);
163 record_unwind_protect_void (call_process_kill
);
164 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
167 wait_for_termination (synch_process_pid
, 0, 1);
168 synch_process_pid
= 0;
170 specpdl_ptr
= specpdl
+ count
; /* Discard the unwind protect. */
171 message1 ("Waiting for process to die...done");
175 if (synch_process_fd
>= 0)
176 emacs_close (synch_process_fd
);
179 /* FILE is "" when we didn't actually create a temporary file in
181 if (!(strcmp (SDATA (file
), NULL_DEVICE
) == 0 || SREF (file
, 0) == '\0'))
182 unlink (SDATA (file
));
187 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
189 static mode_t
const default_output_mode
= 0666;
192 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
193 doc
: /* Call PROGRAM synchronously in separate process.
194 The remaining arguments are optional.
195 The program's input comes from file INFILE (nil means `/dev/null').
196 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
197 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
198 FILE is a file name string, means that it should be written to that file
199 \(if the file already exists it is overwritten).
200 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
201 REAL-BUFFER says what to do with standard output, as above,
202 while STDERR-FILE says what to do with standard error in the child.
203 STDERR-FILE may be nil (discard standard error output),
204 t (mix it with ordinary output), or a file name string.
206 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
207 Remaining arguments are strings passed as command arguments to PROGRAM.
209 If executable PROGRAM can't be found as an executable, `call-process'
210 signals a Lisp error. `call-process' reports errors in execution of
211 the program only through its return and output.
213 If DESTINATION is 0, `call-process' returns immediately with value nil.
214 Otherwise it waits for PROGRAM to terminate
215 and returns a numeric exit status or a signal description string.
216 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
218 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
219 (ptrdiff_t nargs
, Lisp_Object
*args
)
221 Lisp_Object infile
, buffer
, current_dir
, path
;
223 int fd0
, fd1
, filefd
;
225 ptrdiff_t count
= SPECPDL_INDEX ();
229 /* File to use for stderr in the child.
230 t means use same as standard output. */
231 Lisp_Object error_file
;
232 Lisp_Object output_file
= Qnil
;
233 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
234 char *outf
, *tempfile
= NULL
;
242 struct coding_system process_coding
; /* coding-system of process output */
243 struct coding_system argument_coding
; /* coding-system of arguments */
244 /* Set to the return value of Ffind_operation_coding_system. */
245 Lisp_Object coding_systems
;
246 bool output_to_buffer
= 1;
248 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
251 CHECK_STRING (args
[0]);
256 /* Without asynchronous processes we cannot have BUFFER == 0. */
258 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
259 error ("Operating system cannot handle asynchronous subprocesses");
260 #endif /* subprocesses */
262 /* Decide the coding-system for giving arguments. */
264 Lisp_Object val
, *args2
;
267 /* If arguments are supplied, we may have to encode them. */
270 bool must_encode
= 0;
271 Lisp_Object coding_attrs
;
273 for (i
= 4; i
< nargs
; i
++)
274 CHECK_STRING (args
[i
]);
276 for (i
= 4; i
< nargs
; i
++)
277 if (STRING_MULTIBYTE (args
[i
]))
280 if (!NILP (Vcoding_system_for_write
))
281 val
= Vcoding_system_for_write
;
282 else if (! must_encode
)
286 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
287 args2
[0] = Qcall_process
;
288 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
289 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
290 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
292 val
= complement_process_encoding_system (val
);
293 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
294 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
295 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
297 /* We should not use an ASCII incompatible coding system. */
298 val
= raw_text_coding_system (val
);
299 setup_coding_system (val
, &argument_coding
);
304 if (nargs
>= 2 && ! NILP (args
[1]))
306 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
307 CHECK_STRING (infile
);
310 infile
= build_string (NULL_DEVICE
);
316 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
317 FILE-FOR-STDERR), unless the first element is :file, in which case see
318 the next paragraph. */
320 && (! SYMBOLP (XCAR (buffer
))
321 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file")))
323 if (CONSP (XCDR (buffer
)))
325 Lisp_Object stderr_file
;
326 stderr_file
= XCAR (XCDR (buffer
));
328 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
329 error_file
= stderr_file
;
331 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
334 buffer
= XCAR (buffer
);
337 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
339 && SYMBOLP (XCAR (buffer
))
340 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file"))
342 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
343 BVAR (current_buffer
, directory
));
344 CHECK_STRING (output_file
);
348 if (!(EQ (buffer
, Qnil
)
350 || INTEGERP (buffer
)))
352 Lisp_Object spec_buffer
;
353 spec_buffer
= buffer
;
354 buffer
= Fget_buffer_create (buffer
);
355 /* Mention the buffer name for a better error message. */
357 CHECK_BUFFER (spec_buffer
);
358 CHECK_BUFFER (buffer
);
364 /* Make sure that the child will be able to chdir to the current
365 buffer's current directory, or its unhandled equivalent. We
366 can't just have the child check for an error when it does the
367 chdir, since it's in a vfork.
369 We have to GCPRO around this because Fexpand_file_name,
370 Funhandled_file_name_directory, and Ffile_accessible_directory_p
371 might call a file name handling function. The argument list is
372 protected by the caller, so all we really have to worry about is
375 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
377 current_dir
= BVAR (current_buffer
, directory
);
379 GCPRO5 (infile
, buffer
, current_dir
, error_file
, output_file
);
381 current_dir
= Funhandled_file_name_directory (current_dir
);
382 if (NILP (current_dir
))
383 /* If the file name handler says that current_dir is unreachable, use
384 a sensible default. */
385 current_dir
= build_string ("~/");
386 current_dir
= expand_and_dir_to_file (current_dir
, Qnil
);
387 current_dir
= Ffile_name_as_directory (current_dir
);
389 if (NILP (Ffile_accessible_directory_p (current_dir
)))
390 report_file_error ("Setting current directory",
391 BVAR (current_buffer
, directory
));
393 if (STRING_MULTIBYTE (infile
))
394 infile
= ENCODE_FILE (infile
);
395 if (STRING_MULTIBYTE (current_dir
))
396 current_dir
= ENCODE_FILE (current_dir
);
397 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
398 error_file
= ENCODE_FILE (error_file
);
399 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
400 output_file
= ENCODE_FILE (output_file
);
404 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
406 filefd
= emacs_open (SSDATA (infile
), O_RDONLY
, 0);
409 int open_errno
= errno
;
410 report_file_errno ("Opening process input file", DECODE_FILE (infile
),
414 if (STRINGP (output_file
))
416 fd_output
= emacs_open (SSDATA (output_file
),
417 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
418 default_output_mode
);
421 int open_errno
= errno
;
422 output_file
= DECODE_FILE (output_file
);
423 report_file_errno ("Opening process output file",
424 output_file
, open_errno
);
426 if (STRINGP (error_file
) || NILP (error_file
))
427 output_to_buffer
= 0;
430 /* Search for program; barf if not found. */
432 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
435 GCPRO4 (infile
, buffer
, current_dir
, error_file
);
436 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
440 int openp_errno
= errno
;
441 emacs_close (filefd
);
442 report_file_errno ("Searching for program", args
[0], openp_errno
);
446 /* If program file name starts with /: for quoting a magic name,
448 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
449 && SREF (path
, 1) == ':')
450 path
= Fsubstring (path
, make_number (2), Qnil
);
452 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
455 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
457 GCPRO5 (infile
, buffer
, current_dir
, path
, error_file
);
462 argument_coding
.dst_multibyte
= 0;
463 for (i
= 4; i
< nargs
; i
++)
465 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
466 if (CODING_REQUIRE_ENCODING (&argument_coding
))
467 /* We must encode this argument. */
468 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
470 for (i
= 4; i
< nargs
; i
++)
471 new_argv
[i
- 3] = SSDATA (args
[i
]);
476 if (STRING_MULTIBYTE (path
))
477 path
= ENCODE_FILE (path
);
478 new_argv
[0] = SSDATA (path
);
482 #ifdef MSDOS /* MW, July 1993 */
484 /* If we're redirecting STDOUT to a file, that file is already open
488 if ((outf
= egetenv ("TMPDIR")))
489 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
492 tempfile
= alloca (20);
495 dostounix_filename (tempfile
, 0);
496 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
497 strcat (tempfile
, "/");
498 strcat (tempfile
, "detmp.XXX");
500 outfilefd
= emacs_open (tempfile
, O_WRONLY
| O_CREAT
| O_TRUNC
,
504 int open_errno
= errno
;
505 emacs_close (filefd
);
506 report_file_errno ("Opening process output file",
507 build_string (tempfile
), open_errno
);
511 outfilefd
= fd_output
;
516 if (INTEGERP (buffer
))
519 fd1
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
525 if (emacs_pipe (fd
) != 0)
527 int pipe_errno
= errno
;
528 emacs_close (filefd
);
529 report_file_errno ("Creating process pipe", Qnil
, pipe_errno
);
542 if (NILP (error_file
))
543 fd_error
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
544 else if (STRINGP (error_file
))
545 fd_error
= emacs_open (SSDATA (error_file
),
546 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
547 default_output_mode
);
551 int open_errno
= errno
;
552 emacs_close (filefd
);
560 if (NILP (error_file
))
561 error_file
= build_string (NULL_DEVICE
);
562 else if (STRINGP (error_file
))
563 error_file
= DECODE_FILE (error_file
);
564 report_file_errno ("Cannot redirect stderr", error_file
, open_errno
);
567 #ifdef MSDOS /* MW, July 1993 */
568 /* Note that on MSDOS `child_setup' actually returns the child process
569 exit status, not its PID, so assign it to status below. */
570 pid
= child_setup (filefd
, outfilefd
, fd_error
, new_argv
, 0, current_dir
);
573 emacs_close (outfilefd
);
574 if (fd_error
!= outfilefd
)
575 emacs_close (fd_error
);
578 synchronize_system_messages_locale ();
580 code_convert_string_norecord (build_string (strerror (child_errno
)),
581 Vlocale_coding_system
, 0);
584 fd1
= -1; /* No harm in closing that one! */
587 /* Since CRLF is converted to LF within `decode_coding', we
588 can always open a file with binary mode. */
589 fd0
= emacs_open (tempfile
, O_RDONLY
| O_BINARY
, 0);
592 int open_errno
= errno
;
594 emacs_close (filefd
);
595 report_file_errno ("Cannot re-open temporary file",
596 build_string (tempfile
), open_errno
);
600 fd0
= -1; /* We are not going to read from tempfile. */
603 /* Do the unwind-protect now, even though the pid is not known, so
604 that no storage allocation is done in the critical section.
605 The actual PID will be filled in during the critical section. */
606 synch_process_pid
= 0;
607 synch_process_fd
= fd0
;
610 /* MSDOS needs different cleanup information. */
611 record_unwind_protect (call_process_cleanup
,
612 Fcons (Fcurrent_buffer (),
613 build_string (tempfile
? tempfile
: "")));
615 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
618 block_child_signal ();
621 pid
= child_setup (filefd
, fd1
, fd_error
, new_argv
, 0, current_dir
);
622 /* We need to record the input file of this child, for when we are
623 called from call-process-region to create an async subprocess.
624 That's because call-process-region's unwind procedure will
625 attempt to delete the temporary input file, which will fail
626 because that file is still in use. Recording it with the child
627 will allow us to delete the file when the subprocess exits.
628 The second part of this is in delete_temp_file, q.v. */
629 if (pid
> 0 && INTEGERP (buffer
) && nargs
>= 2 && !NILP (args
[1]))
630 record_infile (pid
, xstrdup (SSDATA (infile
)));
631 #else /* not WINDOWSNT */
633 /* vfork, and prevent local vars from being clobbered by the vfork. */
635 Lisp_Object
volatile buffer_volatile
= buffer
;
636 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
637 Lisp_Object
volatile current_dir_volatile
= current_dir
;
638 bool volatile display_p_volatile
= display_p
;
639 bool volatile output_to_buffer_volatile
= output_to_buffer
;
640 bool volatile sa_must_free_volatile
= sa_must_free
;
641 int volatile fd1_volatile
= fd1
;
642 int volatile fd_error_volatile
= fd_error
;
643 int volatile fd_output_volatile
= fd_output
;
644 int volatile filefd_volatile
= filefd
;
645 ptrdiff_t volatile count_volatile
= count
;
646 ptrdiff_t volatile sa_count_volatile
= sa_count
;
647 char **volatile new_argv_volatile
= new_argv
;
652 buffer
= buffer_volatile
;
653 coding_systems
= coding_systems_volatile
;
654 current_dir
= current_dir_volatile
;
655 display_p
= display_p_volatile
;
656 output_to_buffer
= output_to_buffer_volatile
;
657 sa_must_free
= sa_must_free_volatile
;
659 fd_error
= fd_error_volatile
;
660 fd_output
= fd_output_volatile
;
661 filefd
= filefd_volatile
;
662 count
= count_volatile
;
663 sa_count
= sa_count_volatile
;
664 new_argv
= new_argv_volatile
;
666 fd0
= synch_process_fd
;
671 unblock_child_signal ();
678 /* Emacs ignores SIGPIPE, but the child should not. */
679 signal (SIGPIPE
, SIG_DFL
);
681 child_setup (filefd
, fd1
, fd_error
, new_argv
, 0, current_dir
);
684 #endif /* not WINDOWSNT */
690 if (INTEGERP (buffer
))
691 record_deleted_pid (pid
);
693 synch_process_pid
= pid
;
696 unblock_child_signal ();
699 /* The MSDOS case did this already. */
701 emacs_close (fd_error
);
702 #endif /* not MSDOS */
704 /* Close most of our file descriptors, but not fd0
705 since we will use that to read input from. */
706 emacs_close (filefd
);
708 emacs_close (fd_output
);
709 if (fd1
>= 0 && fd1
!= fd_error
)
714 report_file_errno ("Doing vfork", Qnil
, child_errno
);
716 if (INTEGERP (buffer
))
717 return unbind_to (count
, Qnil
);
719 if (BUFFERP (buffer
))
720 Fset_buffer (buffer
);
724 /* If BUFFER is nil, we must read process output once and then
725 discard it, so setup coding system but with nil. */
726 setup_coding_system (Qnil
, &process_coding
);
727 process_coding
.dst_multibyte
= 0;
731 Lisp_Object val
, *args2
;
734 if (!NILP (Vcoding_system_for_read
))
735 val
= Vcoding_system_for_read
;
738 if (EQ (coding_systems
, Qt
))
742 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
743 args2
[0] = Qcall_process
;
744 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
746 = Ffind_operation_coding_system (nargs
+ 1, args2
);
748 if (CONSP (coding_systems
))
749 val
= XCAR (coding_systems
);
750 else if (CONSP (Vdefault_process_coding_system
))
751 val
= XCAR (Vdefault_process_coding_system
);
755 Fcheck_coding_system (val
);
756 /* In unibyte mode, character code conversion should not take
757 place but EOL conversion should. So, setup raw-text or one
758 of the subsidiary according to the information just setup. */
759 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
761 val
= raw_text_coding_system (val
);
762 setup_coding_system (val
, &process_coding
);
763 process_coding
.dst_multibyte
764 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
766 process_coding
.src_multibyte
= 0;
771 if (output_to_buffer
)
773 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
774 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
775 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
776 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
779 EMACS_INT total_read
= 0;
781 bool display_on_the_fly
= display_p
;
782 struct coding_system saved_coding
;
784 saved_coding
= process_coding
;
787 /* Repeatedly read until we've filled as much as possible
788 of the buffer size we have. But don't read
789 less than 1024--save that for the next bufferful. */
791 while (nread
< bufsize
- 1024)
793 int this_read
= emacs_read (fd0
, buf
+ nread
,
801 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
806 total_read
+= this_read
;
808 if (display_on_the_fly
)
812 /* Now NREAD is the total amount of data in the buffer. */
817 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
818 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
819 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
821 { /* We have to decode the input. */
823 ptrdiff_t count1
= SPECPDL_INDEX ();
825 XSETBUFFER (curbuf
, current_buffer
);
826 /* We cannot allow after-change-functions be run
827 during decoding, because that might modify the
828 buffer, while we rely on process_coding.produced to
829 faithfully reflect inserted text until we
830 TEMP_SET_PT_BOTH below. */
831 specbind (Qinhibit_modification_hooks
, Qt
);
832 decode_coding_c_string (&process_coding
,
833 (unsigned char *) buf
, nread
, curbuf
);
834 unbind_to (count1
, Qnil
);
835 if (display_on_the_fly
836 && CODING_REQUIRE_DETECTION (&saved_coding
)
837 && ! CODING_REQUIRE_DETECTION (&process_coding
))
839 /* We have detected some coding system. But,
840 there's a possibility that the detection was
841 done by insufficient data. So, we give up
842 displaying on the fly. */
843 if (process_coding
.produced
> 0)
844 del_range_2 (process_coding
.dst_pos
,
845 process_coding
.dst_pos_byte
,
846 process_coding
.dst_pos
847 + process_coding
.produced_char
,
848 process_coding
.dst_pos_byte
849 + process_coding
.produced
, 0);
850 display_on_the_fly
= 0;
851 process_coding
= saved_coding
;
853 /* This is to make the above condition always
854 fails in the future. */
855 saved_coding
.common_flags
856 &= ~CODING_REQUIRE_DETECTION_MASK
;
860 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
861 PT_BYTE
+ process_coding
.produced
);
862 carryover
= process_coding
.carryover_bytes
;
864 memcpy (buf
, process_coding
.carryover
,
865 process_coding
.carryover_bytes
);
869 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
872 /* Make the buffer bigger as we continue to read more data,
873 but not past CALLPROC_BUFFER_SIZE_MAX. */
874 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
875 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
876 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
881 prepare_menu_bars ();
883 redisplay_preserve_echo_area (1);
884 /* This variable might have been set to 0 for code
885 detection. In that case, we set it back to 1 because
886 we should have already detected a coding system. */
887 display_on_the_fly
= 1;
894 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
895 /* If the caller required, let the buffer inherit the
896 coding-system used to decode the process output. */
897 if (inherit_process_coding_system
)
898 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
899 make_number (total_read
));
903 /* Wait for it to terminate, unless it already has. */
904 wait_for_termination (pid
, &status
, !output_to_buffer
);
909 /* Don't kill any children that the subprocess may have left behind
911 synch_process_pid
= 0;
914 unbind_to (count
, Qnil
);
916 if (WIFSIGNALED (status
))
920 synchronize_system_messages_locale ();
921 signame
= strsignal (WTERMSIG (status
));
926 return code_convert_string_norecord (build_string (signame
),
927 Vlocale_coding_system
, 0);
930 eassert (WIFEXITED (status
));
931 return make_number (WEXITSTATUS (status
));
935 delete_temp_file (Lisp_Object name
)
937 /* Suppress jka-compr handling, etc. */
938 ptrdiff_t count
= SPECPDL_INDEX ();
939 specbind (intern ("file-name-handler-alist"), Qnil
);
941 /* If this is called when the subprocess didn't exit yet, the
942 attempt to delete its input file will fail. In that case, we
943 schedule the file for deletion when the subprocess exits. This
944 is the 2nd part of handling this situation; see the call to
945 record_infile in call-process above, for the first part. */
946 if (!internal_delete_file (name
))
948 Lisp_Object encoded_file
= ENCODE_FILE (name
);
950 record_pending_deletion (SSDATA (encoded_file
));
953 internal_delete_file (name
);
955 unbind_to (count
, Qnil
);
958 /* Create a temporary file suitable for storing the input data of
959 call-process-region. NARGS and ARGS are the same as for
960 call-process-region. */
963 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
)
966 Lisp_Object filename_string
;
967 Lisp_Object val
, start
, end
;
970 if (STRINGP (Vtemporary_file_directory
))
971 tmpdir
= Vtemporary_file_directory
;
976 outf
= getenv ("TMPDIR");
977 tmpdir
= build_string (outf
? outf
: "/tmp/");
979 if ((outf
= egetenv ("TMPDIR"))
980 || (outf
= egetenv ("TMP"))
981 || (outf
= egetenv ("TEMP")))
982 tmpdir
= build_string (outf
);
984 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
989 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
993 /* Cannot use the result of Fexpand_file_name, because it
994 downcases the XXXXXX part of the pattern, and mktemp then
995 doesn't recognize it. */
996 if (!NILP (Vw32_downcase_file_names
))
998 Lisp_Object dirname
= Ffile_name_directory (pattern
);
1001 pattern
= Vtemp_file_name_pattern
;
1003 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
1007 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
1008 GCPRO1 (filename_string
);
1009 tempfile
= SSDATA (filename_string
);
1012 int fd
= mkostemp (tempfile
, O_CLOEXEC
);
1014 report_file_error ("Failed to open temporary file using pattern",
1019 record_unwind_protect (delete_temp_file
, filename_string
);
1024 /* Decide coding-system of the contents of the temporary file. */
1025 if (!NILP (Vcoding_system_for_write
))
1026 val
= Vcoding_system_for_write
;
1027 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1031 Lisp_Object coding_systems
;
1034 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1035 args2
[0] = Qcall_process_region
;
1036 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1037 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1038 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1041 val
= complement_process_encoding_system (val
);
1044 ptrdiff_t count1
= SPECPDL_INDEX ();
1046 specbind (intern ("coding-system-for-write"), val
);
1047 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1048 happen to get a ".Z" suffix. */
1049 specbind (intern ("file-name-handler-alist"), Qnil
);
1050 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
1052 unbind_to (count1
, Qnil
);
1055 /* Note that Fcall_process takes care of binding
1056 coding-system-for-read. */
1058 RETURN_UNGCPRO (filename_string
);
1061 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1063 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1064 The remaining arguments are optional.
1065 Delete the text if fourth arg DELETE is non-nil.
1067 Insert output in BUFFER before point; t means current buffer; nil for
1068 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1069 FILE)', where FILE is a file name string, means that it should be
1070 written to that file (if the file already exists it is overwritten).
1071 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1072 REAL-BUFFER says what to do with standard output, as above,
1073 while STDERR-FILE says what to do with standard error in the child.
1074 STDERR-FILE may be nil (discard standard error output),
1075 t (mix it with ordinary output), or a file name string.
1077 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1078 Remaining args are passed to PROGRAM at startup as command args.
1080 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1081 Otherwise it waits for PROGRAM to terminate
1082 and returns a numeric exit status or a signal description string.
1083 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1085 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1086 (ptrdiff_t nargs
, Lisp_Object
*args
)
1088 struct gcpro gcpro1
;
1090 ptrdiff_t count
= SPECPDL_INDEX ();
1091 Lisp_Object start
= args
[0];
1092 Lisp_Object end
= args
[1];
1095 if (STRINGP (start
))
1096 empty_input
= SCHARS (start
) == 0;
1097 else if (NILP (start
))
1098 empty_input
= BEG
== Z
;
1101 validate_region (&args
[0], &args
[1]);
1104 empty_input
= XINT (start
) == XINT (end
);
1107 infile
= empty_input
? Qnil
: create_temp_file (nargs
, args
);
1110 if (nargs
> 3 && !NILP (args
[3]))
1111 Fdelete_region (start
, end
);
1125 RETURN_UNGCPRO (unbind_to (count
, Fcall_process (nargs
, args
)));
1129 static int relocate_fd (int fd
, int minfd
);
1133 add_env (char **env
, char **new_env
, char *string
)
1140 /* See if this string duplicates any string already in the env.
1141 If so, don't put it in.
1142 When an env var has multiple definitions,
1143 we keep the definition that comes first in process-environment. */
1144 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1146 char *p
= *ep
, *q
= string
;
1152 /* The string is a lone variable name; keep it for now, we
1153 will remove it later. It is a placeholder for a
1154 variable that is not to be included in the environment. */
1162 *new_env
++ = string
;
1166 /* This is the last thing run in a newly forked inferior
1167 either synchronous or asynchronous.
1168 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1169 Initialize inferior's priority, pgrp, connected dir and environment.
1170 then exec another program based on new_argv.
1172 If SET_PGRP, put the subprocess into a separate process group.
1174 CURRENT_DIR is an elisp string giving the path of the current
1175 directory the subprocess should have. Since we can't really signal
1176 a decent error from within the child, this should be verified as an
1177 executable directory by the parent. */
1180 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1181 Lisp_Object current_dir
)
1191 pid_t pid
= getpid ();
1192 #endif /* WINDOWSNT */
1194 /* Note that use of alloca is always safe here. It's obvious for systems
1195 that do not have true vfork or that have true (stack) alloca.
1196 If using vfork and C_ALLOCA (when Emacs used to include
1197 src/alloca.c) it is safe because that changes the superior's
1198 static variables as if the superior had done alloca and will be
1199 cleaned up in the usual way. */
1201 register char *temp
;
1202 size_t i
; /* size_t, because ptrdiff_t might overflow here! */
1204 i
= SBYTES (current_dir
);
1206 /* MSDOS must have all environment variables malloc'ed, because
1207 low-level libc functions that launch subsidiary processes rely
1209 pwd_var
= xmalloc (i
+ 6);
1211 pwd_var
= alloca (i
+ 6);
1214 memcpy (pwd_var
, "PWD=", 4);
1215 memcpy (temp
, SDATA (current_dir
), i
);
1216 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
1220 /* We can't signal an Elisp error here; we're in a vfork. Since
1221 the callers check the current directory before forking, this
1222 should only return an error if the directory's permissions
1223 are changed between the check and this chdir, but we should
1225 if (chdir (temp
) < 0)
1226 _exit (EXIT_CANCELED
);
1228 /* Get past the drive letter, so that d:/ is left alone. */
1229 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1236 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1237 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1241 /* Set `env' to a vector of the strings in the environment. */
1243 register Lisp_Object tem
;
1244 register char **new_env
;
1246 register int new_length
;
1247 Lisp_Object display
= Qnil
;
1251 for (tem
= Vprocess_environment
;
1252 CONSP (tem
) && STRINGP (XCAR (tem
));
1255 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1256 && (SDATA (XCAR (tem
)) [7] == '\0'
1257 || SDATA (XCAR (tem
)) [7] == '='))
1258 /* DISPLAY is specified in process-environment. */
1263 /* If not provided yet, use the frame's DISPLAY. */
1266 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1267 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1268 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1269 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1270 Vinitial_environment
);
1278 /* new_length + 2 to include PWD and terminating 0. */
1279 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1280 /* If we have a PWD envvar, pass one down,
1281 but with corrected value. */
1282 if (egetenv ("PWD"))
1283 *new_env
++ = pwd_var
;
1285 if (STRINGP (display
))
1287 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1288 strcpy (vdata
, "DISPLAY=");
1289 strcat (vdata
, SSDATA (display
));
1290 new_env
= add_env (env
, new_env
, vdata
);
1294 for (tem
= Vprocess_environment
;
1295 CONSP (tem
) && STRINGP (XCAR (tem
));
1297 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1301 /* Remove variable names without values. */
1305 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1315 prepare_standard_handles (in
, out
, err
, handles
);
1316 set_process_dir (SDATA (current_dir
));
1317 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1318 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1319 reset_standard_handles (in
, out
, err
, handles
);
1321 /* An error occurred while trying to spawn the process. */
1322 report_file_error ("Spawning child process", Qnil
);
1325 #else /* not WINDOWSNT */
1326 /* Make sure that in, out, and err are not actually already in
1327 descriptors zero, one, or two; this could happen if Emacs is
1328 started with its standard in, out, or error closed, as might
1331 int oin
= in
, oout
= out
;
1333 /* We have to avoid relocating the same descriptor twice! */
1335 in
= relocate_fd (in
, 3);
1340 out
= relocate_fd (out
, 3);
1344 else if (err
== oout
)
1347 err
= relocate_fd (err
, 3);
1351 /* Redirect file descriptors and clear the close-on-exec flag on the
1352 redirected ones. IN, OUT, and ERR are close-on-exec so they
1353 need not be closed explicitly. */
1361 execve (new_argv
[0], new_argv
, env
);
1364 /* Avoid deadlock if the child's perror writes to a full pipe; the
1365 pipe's reader is the parent, but with vfork the parent can't
1366 run until the child exits. Truncate the diagnostic instead. */
1367 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1370 emacs_perror (new_argv
[0]);
1371 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1374 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1377 /* An error occurred while trying to run the subprocess. */
1378 report_file_error ("Spawning child process", Qnil
);
1381 #endif /* not WINDOWSNT */
1385 /* Move the file descriptor FD so that its number is not less than MINFD.
1386 If the file descriptor is moved at all, the original is closed on MSDOS,
1387 but not elsewhere as the caller will close it anyway. */
1389 relocate_fd (int fd
, int minfd
)
1395 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1398 emacs_perror ("while setting up child");
1399 _exit (EXIT_CANCELED
);
1407 #endif /* not WINDOWSNT */
1410 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1411 ptrdiff_t *valuelen
, Lisp_Object env
)
1413 for (; CONSP (env
); env
= XCDR (env
))
1415 Lisp_Object entry
= XCAR (env
);
1417 && SBYTES (entry
) >= varlen
1419 /* NT environment variables are case insensitive. */
1420 && ! strnicmp (SDATA (entry
), var
, varlen
)
1421 #else /* not WINDOWSNT */
1422 && ! memcmp (SDATA (entry
), var
, varlen
)
1423 #endif /* not WINDOWSNT */
1426 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1428 *value
= SSDATA (entry
) + (varlen
+ 1);
1429 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1432 else if (SBYTES (entry
) == varlen
)
1434 /* Lone variable names in Vprocess_environment mean that
1435 variable should be removed from the environment. */
1445 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1446 ptrdiff_t *valuelen
, Lisp_Object frame
)
1448 /* Try to find VAR in Vprocess_environment first. */
1449 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1450 Vprocess_environment
))
1451 return *value
? 1 : 0;
1453 /* For DISPLAY try to get the values from the frame or the initial env. */
1454 if (strcmp (var
, "DISPLAY") == 0)
1457 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1458 if (STRINGP (display
))
1460 *value
= SSDATA (display
);
1461 *valuelen
= SBYTES (display
);
1464 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1465 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1466 Vinitial_environment
))
1467 return *value
? 1 : 0;
1473 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1474 doc
: /* Get the value of environment variable VARIABLE.
1475 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1476 the environment. Otherwise, value is a string.
1478 This function searches `process-environment' for VARIABLE.
1480 If optional parameter ENV is a list, then search this list instead of
1481 `process-environment', and return t when encountering a negative entry
1482 \(an entry for a variable with no value). */)
1483 (Lisp_Object variable
, Lisp_Object env
)
1488 CHECK_STRING (variable
);
1491 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1492 &value
, &valuelen
, env
))
1493 return value
? make_string (value
, valuelen
) : Qt
;
1497 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1498 &value
, &valuelen
, env
))
1499 return make_string (value
, valuelen
);
1504 /* A version of getenv that consults the Lisp environment lists,
1505 easily callable from C. */
1507 egetenv (const char *var
)
1512 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1519 /* This is run before init_cmdargs. */
1522 init_callproc_1 (void)
1525 const char *etc_dir
= ns_etc_directory ();
1526 const char *path_exec
= ns_exec_path ();
1529 Vdata_directory
= decode_env_path ("EMACSDATA",
1534 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1536 Vdoc_directory
= decode_env_path ("EMACSDOC",
1541 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1543 /* Check the EMACSPATH environment variable, defaulting to the
1544 PATH_EXEC path from epaths.h. */
1545 Vexec_path
= decode_env_path ("EMACSPATH",
1547 path_exec
? path_exec
:
1550 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1551 /* FIXME? For ns, path_exec should go at the front? */
1552 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1555 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1558 init_callproc (void)
1560 char *data_dir
= egetenv ("EMACSDATA");
1563 Lisp_Object tempdir
;
1567 const char *etc_dir
= ns_etc_directory ();
1570 data_dir
= alloca (strlen (etc_dir
) + 1);
1571 strcpy (data_dir
, etc_dir
);
1576 if (!NILP (Vinstallation_directory
))
1578 /* Add to the path the lib-src subdir of the installation dir. */
1580 tem
= Fexpand_file_name (build_string ("lib-src"),
1581 Vinstallation_directory
);
1583 /* MSDOS uses wrapped binaries, so don't do this. */
1584 if (NILP (Fmember (tem
, Vexec_path
)))
1587 const char *path_exec
= ns_exec_path ();
1589 Vexec_path
= decode_env_path ("EMACSPATH",
1591 path_exec
? path_exec
:
1594 Vexec_path
= Fcons (tem
, Vexec_path
);
1595 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1598 Vexec_directory
= Ffile_name_as_directory (tem
);
1599 #endif /* not MSDOS */
1601 /* Maybe use ../etc as well as ../lib-src. */
1604 tem
= Fexpand_file_name (build_string ("etc"),
1605 Vinstallation_directory
);
1606 Vdoc_directory
= Ffile_name_as_directory (tem
);
1610 /* Look for the files that should be in etc. We don't use
1611 Vinstallation_directory, because these files are never installed
1612 near the executable, and they are never in the build
1613 directory when that's different from the source directory.
1615 Instead, if these files are not in the nominal place, we try the
1616 source directory. */
1619 Lisp_Object tem
, tem1
, srcdir
;
1621 srcdir
= Fexpand_file_name (build_string ("../src/"),
1622 build_string (PATH_DUMPLOADSEARCH
));
1623 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1624 tem1
= Ffile_exists_p (tem
);
1625 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1628 newdir
= Fexpand_file_name (build_string ("../etc/"),
1629 build_string (PATH_DUMPLOADSEARCH
));
1630 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1631 tem1
= Ffile_exists_p (tem
);
1633 Vdata_directory
= newdir
;
1641 tempdir
= Fdirectory_file_name (Vexec_directory
);
1642 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1643 dir_warning ("arch-dependent data dir", Vexec_directory
);
1646 tempdir
= Fdirectory_file_name (Vdata_directory
);
1647 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1648 dir_warning ("arch-independent data dir", Vdata_directory
);
1650 sh
= getenv ("SHELL");
1651 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1654 Vshared_game_score_directory
= Qnil
;
1656 Vshared_game_score_directory
= build_string (PATH_GAME
);
1657 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1658 Vshared_game_score_directory
= Qnil
;
1663 set_initial_environment (void)
1666 for (envp
= environ
; *envp
; envp
++)
1667 Vprocess_environment
= Fcons (build_string (*envp
),
1668 Vprocess_environment
);
1669 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1670 to use `delete' and friends on process-environment. */
1671 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1675 syms_of_callproc (void)
1678 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1679 #elif defined (WINDOWSNT)
1680 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1682 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1684 staticpro (&Vtemp_file_name_pattern
);
1686 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1687 doc
: /* File name to load inferior shells from.
1688 Initialized from the SHELL environment variable, or to a system-dependent
1689 default if SHELL is not set. */);
1691 DEFVAR_LISP ("exec-path", Vexec_path
,
1692 doc
: /* List of directories to search programs to run in subprocesses.
1693 Each element is a string (directory name) or nil (try default directory). */);
1695 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1696 doc
: /* List of suffixes to try to find executable file names.
1697 Each element is a string. */);
1698 Vexec_suffixes
= Qnil
;
1700 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1701 doc
: /* Directory for executables for Emacs to invoke.
1702 More generally, this includes any architecture-dependent files
1703 that are built and installed from the Emacs distribution. */);
1705 DEFVAR_LISP ("data-directory", Vdata_directory
,
1706 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1707 These are files intended for Emacs to use while it runs. */);
1709 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1710 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1711 This is usually the same as `data-directory'. */);
1713 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1714 doc
: /* For internal use by the build procedure only.
1715 This is the name of the directory in which the build procedure installed
1716 Emacs's info files; the default value for `Info-default-directory-list'
1718 Vconfigure_info_directory
= build_string (PATH_INFO
);
1720 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1721 doc
: /* Directory of score files for games which come with GNU Emacs.
1722 If this variable is nil, then Emacs is unable to use a shared directory. */);
1724 Vshared_game_score_directory
= Qnil
;
1726 Vshared_game_score_directory
= build_string (PATH_GAME
);
1729 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1730 doc
: /* List of environment variables inherited from the parent process.
1731 Each element should be a string of the form ENVVARNAME=VALUE.
1732 The elements must normally be decoded (using `locale-coding-system') for use. */);
1733 Vinitial_environment
= Qnil
;
1735 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1736 doc
: /* List of overridden environment variables for subprocesses to inherit.
1737 Each element should be a string of the form ENVVARNAME=VALUE.
1739 Entries in this list take precedence to those in the frame-local
1740 environments. Therefore, let-binding `process-environment' is an easy
1741 way to temporarily change the value of an environment variable,
1742 irrespective of where it comes from. To use `process-environment' to
1743 remove an environment variable, include only its name in the list,
1746 This variable is set to nil when Emacs starts.
1748 If multiple entries define the same variable, the first one always
1751 Non-ASCII characters are encoded according to the initial value of
1752 `locale-coding-system', i.e. the elements must normally be decoded for
1755 See `setenv' and `getenv'. */);
1756 Vprocess_environment
= Qnil
;
1758 defsubr (&Scall_process
);
1759 defsubr (&Sgetenv_internal
);
1760 defsubr (&Scall_process_region
);