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 (Lisp_Object ignored
)
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
);
143 /* Clean up when exiting Fcall_process.
144 On MSDOS, delete the temporary file on any kind of termination.
145 On Unix, kill the process and any children on termination by signal. */
148 call_process_cleanup (Lisp_Object arg
)
151 Lisp_Object buffer
= Fcar (arg
);
152 Lisp_Object file
= Fcdr (arg
);
154 Lisp_Object buffer
= arg
;
157 Fset_buffer (buffer
);
160 /* If the process still exists, kill its process group. */
161 if (synch_process_pid
)
163 ptrdiff_t count
= SPECPDL_INDEX ();
164 kill (-synch_process_pid
, SIGINT
);
165 record_unwind_protect (call_process_kill
, make_number (0));
166 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
169 wait_for_termination (synch_process_pid
, 0, 1);
170 synch_process_pid
= 0;
172 specpdl_ptr
= specpdl
+ count
; /* Discard the unwind protect. */
173 message1 ("Waiting for process to die...done");
177 if (synch_process_fd
>= 0)
178 emacs_close (synch_process_fd
);
181 /* FILE is "" when we didn't actually create a temporary file in
183 if (!(strcmp (SDATA (file
), NULL_DEVICE
) == 0 || SREF (file
, 0) == '\0'))
184 unlink (SDATA (file
));
191 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
193 static mode_t
const default_output_mode
= 0666;
196 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
197 doc
: /* Call PROGRAM synchronously in separate process.
198 The remaining arguments are optional.
199 The program's input comes from file INFILE (nil means `/dev/null').
200 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
201 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
202 FILE is a file name string, means that it should be written to that file
203 \(if the file already exists it is overwritten).
204 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
205 REAL-BUFFER says what to do with standard output, as above,
206 while STDERR-FILE says what to do with standard error in the child.
207 STDERR-FILE may be nil (discard standard error output),
208 t (mix it with ordinary output), or a file name string.
210 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
211 Remaining arguments are strings passed as command arguments to PROGRAM.
213 If executable PROGRAM can't be found as an executable, `call-process'
214 signals a Lisp error. `call-process' reports errors in execution of
215 the program only through its return and output.
217 If DESTINATION is 0, `call-process' returns immediately with value nil.
218 Otherwise it waits for PROGRAM to terminate
219 and returns a numeric exit status or a signal description string.
220 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
222 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
223 (ptrdiff_t nargs
, Lisp_Object
*args
)
225 Lisp_Object infile
, buffer
, current_dir
, path
;
227 int fd0
, fd1
, filefd
;
229 ptrdiff_t count
= SPECPDL_INDEX ();
233 /* File to use for stderr in the child.
234 t means use same as standard output. */
235 Lisp_Object error_file
;
236 Lisp_Object output_file
= Qnil
;
237 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
238 char *outf
, *tempfile
= NULL
;
246 struct coding_system process_coding
; /* coding-system of process output */
247 struct coding_system argument_coding
; /* coding-system of arguments */
248 /* Set to the return value of Ffind_operation_coding_system. */
249 Lisp_Object coding_systems
;
250 bool output_to_buffer
= 1;
252 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
255 CHECK_STRING (args
[0]);
260 /* Without asynchronous processes we cannot have BUFFER == 0. */
262 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
263 error ("Operating system cannot handle asynchronous subprocesses");
264 #endif /* subprocesses */
266 /* Decide the coding-system for giving arguments. */
268 Lisp_Object val
, *args2
;
271 /* If arguments are supplied, we may have to encode them. */
274 bool must_encode
= 0;
275 Lisp_Object coding_attrs
;
277 for (i
= 4; i
< nargs
; i
++)
278 CHECK_STRING (args
[i
]);
280 for (i
= 4; i
< nargs
; i
++)
281 if (STRING_MULTIBYTE (args
[i
]))
284 if (!NILP (Vcoding_system_for_write
))
285 val
= Vcoding_system_for_write
;
286 else if (! must_encode
)
290 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
291 args2
[0] = Qcall_process
;
292 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
293 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
294 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
296 val
= complement_process_encoding_system (val
);
297 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
298 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
299 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
301 /* We should not use an ASCII incompatible coding system. */
302 val
= raw_text_coding_system (val
);
303 setup_coding_system (val
, &argument_coding
);
308 if (nargs
>= 2 && ! NILP (args
[1]))
310 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
311 CHECK_STRING (infile
);
314 infile
= build_string (NULL_DEVICE
);
320 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
321 FILE-FOR-STDERR), unless the first element is :file, in which case see
322 the next paragraph. */
324 && (! SYMBOLP (XCAR (buffer
))
325 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file")))
327 if (CONSP (XCDR (buffer
)))
329 Lisp_Object stderr_file
;
330 stderr_file
= XCAR (XCDR (buffer
));
332 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
333 error_file
= stderr_file
;
335 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
338 buffer
= XCAR (buffer
);
341 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
343 && SYMBOLP (XCAR (buffer
))
344 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file"))
346 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
347 BVAR (current_buffer
, directory
));
348 CHECK_STRING (output_file
);
352 if (!(EQ (buffer
, Qnil
)
354 || INTEGERP (buffer
)))
356 Lisp_Object spec_buffer
;
357 spec_buffer
= buffer
;
358 buffer
= Fget_buffer_create (buffer
);
359 /* Mention the buffer name for a better error message. */
361 CHECK_BUFFER (spec_buffer
);
362 CHECK_BUFFER (buffer
);
368 /* Make sure that the child will be able to chdir to the current
369 buffer's current directory, or its unhandled equivalent. We
370 can't just have the child check for an error when it does the
371 chdir, since it's in a vfork.
373 We have to GCPRO around this because Fexpand_file_name,
374 Funhandled_file_name_directory, and Ffile_accessible_directory_p
375 might call a file name handling function. The argument list is
376 protected by the caller, so all we really have to worry about is
379 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
381 current_dir
= BVAR (current_buffer
, directory
);
383 GCPRO5 (infile
, buffer
, current_dir
, error_file
, output_file
);
385 current_dir
= Funhandled_file_name_directory (current_dir
);
386 if (NILP (current_dir
))
387 /* If the file name handler says that current_dir is unreachable, use
388 a sensible default. */
389 current_dir
= build_string ("~/");
390 current_dir
= expand_and_dir_to_file (current_dir
, Qnil
);
391 current_dir
= Ffile_name_as_directory (current_dir
);
393 if (NILP (Ffile_accessible_directory_p (current_dir
)))
394 report_file_error ("Setting current directory",
395 Fcons (BVAR (current_buffer
, directory
), Qnil
));
397 if (STRING_MULTIBYTE (infile
))
398 infile
= ENCODE_FILE (infile
);
399 if (STRING_MULTIBYTE (current_dir
))
400 current_dir
= ENCODE_FILE (current_dir
);
401 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
402 error_file
= ENCODE_FILE (error_file
);
403 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
404 output_file
= ENCODE_FILE (output_file
);
408 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
410 filefd
= emacs_open (SSDATA (infile
), O_RDONLY
, 0);
412 report_file_error ("Opening process input file",
413 Fcons (DECODE_FILE (infile
), Qnil
));
415 if (STRINGP (output_file
))
417 fd_output
= emacs_open (SSDATA (output_file
),
418 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
419 default_output_mode
);
422 int open_errno
= errno
;
423 output_file
= DECODE_FILE (output_file
);
424 report_file_errno ("Opening process output file",
425 Fcons (output_file
, Qnil
), open_errno
);
427 if (STRINGP (error_file
) || NILP (error_file
))
428 output_to_buffer
= 0;
431 /* Search for program; barf if not found. */
433 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
436 GCPRO4 (infile
, buffer
, current_dir
, error_file
);
437 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
441 int openp_errno
= errno
;
442 emacs_close (filefd
);
443 report_file_errno ("Searching for program",
444 Fcons (args
[0], Qnil
), openp_errno
);
448 /* If program file name starts with /: for quoting a magic name,
450 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
451 && SREF (path
, 1) == ':')
452 path
= Fsubstring (path
, make_number (2), Qnil
);
454 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
457 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
459 GCPRO5 (infile
, buffer
, current_dir
, path
, error_file
);
464 argument_coding
.dst_multibyte
= 0;
465 for (i
= 4; i
< nargs
; i
++)
467 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
468 if (CODING_REQUIRE_ENCODING (&argument_coding
))
469 /* We must encode this argument. */
470 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
472 for (i
= 4; i
< nargs
; i
++)
473 new_argv
[i
- 3] = SSDATA (args
[i
]);
478 if (STRING_MULTIBYTE (path
))
479 path
= ENCODE_FILE (path
);
480 new_argv
[0] = SSDATA (path
);
484 #ifdef MSDOS /* MW, July 1993 */
486 /* If we're redirecting STDOUT to a file, that file is already open
490 if ((outf
= egetenv ("TMPDIR")))
491 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
494 tempfile
= alloca (20);
497 dostounix_filename (tempfile
, 0);
498 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
499 strcat (tempfile
, "/");
500 strcat (tempfile
, "detmp.XXX");
502 outfilefd
= emacs_open (tempfile
, O_WRONLY
| O_CREAT
| O_TRUNC
,
506 int open_errno
= errno
;
507 emacs_close (filefd
);
508 report_file_errno ("Opening process output file",
509 Fcons (build_string (tempfile
), Qnil
), open_errno
);
513 outfilefd
= fd_output
;
518 if (INTEGERP (buffer
))
521 fd1
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
527 if (pipe2 (fd
, O_CLOEXEC
) != 0)
529 int pipe_errno
= errno
;
530 emacs_close (filefd
);
531 report_file_errno ("Creating process pipe", Qnil
, pipe_errno
);
544 if (NILP (error_file
))
545 fd_error
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
546 else if (STRINGP (error_file
))
547 fd_error
= emacs_open (SSDATA (error_file
),
548 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
549 default_output_mode
);
553 int open_errno
= errno
;
554 emacs_close (filefd
);
562 if (NILP (error_file
))
563 error_file
= build_string (NULL_DEVICE
);
564 else if (STRINGP (error_file
))
565 error_file
= DECODE_FILE (error_file
);
566 report_file_errno ("Cannot redirect stderr",
567 Fcons (error_file
, Qnil
), open_errno
);
570 #ifdef MSDOS /* MW, July 1993 */
571 /* Note that on MSDOS `child_setup' actually returns the child process
572 exit status, not its PID, so assign it to status below. */
573 pid
= child_setup (filefd
, outfilefd
, fd_error
, new_argv
, 0, current_dir
);
576 emacs_close (outfilefd
);
577 if (fd_error
!= outfilefd
)
578 emacs_close (fd_error
);
581 synchronize_system_messages_locale ();
583 code_convert_string_norecord (build_string (strerror (child_errno
)),
584 Vlocale_coding_system
, 0);
587 fd1
= -1; /* No harm in closing that one! */
590 /* Since CRLF is converted to LF within `decode_coding', we
591 can always open a file with binary mode. */
592 fd0
= emacs_open (tempfile
, O_RDONLY
| O_BINARY
, 0);
595 int open_errno
= errno
;
597 emacs_close (filefd
);
598 report_file_errno ("Cannot re-open temporary file",
599 Fcons (build_string (tempfile
), Qnil
),
604 fd0
= -1; /* We are not going to read from tempfile. */
607 /* Do the unwind-protect now, even though the pid is not known, so
608 that no storage allocation is done in the critical section.
609 The actual PID will be filled in during the critical section. */
610 synch_process_pid
= 0;
611 synch_process_fd
= fd0
;
614 /* MSDOS needs different cleanup information. */
615 record_unwind_protect (call_process_cleanup
,
616 Fcons (Fcurrent_buffer (),
617 build_string (tempfile
? tempfile
: "")));
619 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
622 block_child_signal ();
625 pid
= child_setup (filefd
, fd1
, fd_error
, new_argv
, 0, current_dir
);
626 /* We need to record the input file of this child, for when we are
627 called from call-process-region to create an async subprocess.
628 That's because call-process-region's unwind procedure will
629 attempt to delete the temporary input file, which will fail
630 because that file is still in use. Recording it with the child
631 will allow us to delete the file when the subprocess exits.
632 The second part of this is in delete_temp_file, q.v. */
633 if (pid
> 0 && INTEGERP (buffer
) && nargs
>= 2 && !NILP (args
[1]))
634 record_infile (pid
, xstrdup (SSDATA (infile
)));
635 #else /* not WINDOWSNT */
637 /* vfork, and prevent local vars from being clobbered by the vfork. */
639 Lisp_Object
volatile buffer_volatile
= buffer
;
640 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
641 Lisp_Object
volatile current_dir_volatile
= current_dir
;
642 bool volatile display_p_volatile
= display_p
;
643 bool volatile output_to_buffer_volatile
= output_to_buffer
;
644 bool volatile sa_must_free_volatile
= sa_must_free
;
645 int volatile fd1_volatile
= fd1
;
646 int volatile fd_error_volatile
= fd_error
;
647 int volatile fd_output_volatile
= fd_output
;
648 int volatile filefd_volatile
= filefd
;
649 ptrdiff_t volatile count_volatile
= count
;
650 ptrdiff_t volatile sa_count_volatile
= sa_count
;
651 char **volatile new_argv_volatile
= new_argv
;
656 buffer
= buffer_volatile
;
657 coding_systems
= coding_systems_volatile
;
658 current_dir
= current_dir_volatile
;
659 display_p
= display_p_volatile
;
660 output_to_buffer
= output_to_buffer_volatile
;
661 sa_must_free
= sa_must_free_volatile
;
663 fd_error
= fd_error_volatile
;
664 fd_output
= fd_output_volatile
;
665 filefd
= filefd_volatile
;
666 count
= count_volatile
;
667 sa_count
= sa_count_volatile
;
668 new_argv
= new_argv_volatile
;
670 fd0
= synch_process_fd
;
675 unblock_child_signal ();
682 /* Emacs ignores SIGPIPE, but the child should not. */
683 signal (SIGPIPE
, SIG_DFL
);
685 child_setup (filefd
, fd1
, fd_error
, new_argv
, 0, current_dir
);
688 #endif /* not WINDOWSNT */
694 if (INTEGERP (buffer
))
695 record_deleted_pid (pid
);
697 synch_process_pid
= pid
;
700 unblock_child_signal ();
703 /* The MSDOS case did this already. */
705 emacs_close (fd_error
);
706 #endif /* not MSDOS */
708 /* Close most of our file descriptors, but not fd0
709 since we will use that to read input from. */
710 emacs_close (filefd
);
712 emacs_close (fd_output
);
713 if (fd1
>= 0 && fd1
!= fd_error
)
718 report_file_errno ("Doing vfork", Qnil
, child_errno
);
720 if (INTEGERP (buffer
))
721 return unbind_to (count
, Qnil
);
723 if (BUFFERP (buffer
))
724 Fset_buffer (buffer
);
728 /* If BUFFER is nil, we must read process output once and then
729 discard it, so setup coding system but with nil. */
730 setup_coding_system (Qnil
, &process_coding
);
731 process_coding
.dst_multibyte
= 0;
735 Lisp_Object val
, *args2
;
738 if (!NILP (Vcoding_system_for_read
))
739 val
= Vcoding_system_for_read
;
742 if (EQ (coding_systems
, Qt
))
746 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
747 args2
[0] = Qcall_process
;
748 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
750 = Ffind_operation_coding_system (nargs
+ 1, args2
);
752 if (CONSP (coding_systems
))
753 val
= XCAR (coding_systems
);
754 else if (CONSP (Vdefault_process_coding_system
))
755 val
= XCAR (Vdefault_process_coding_system
);
759 Fcheck_coding_system (val
);
760 /* In unibyte mode, character code conversion should not take
761 place but EOL conversion should. So, setup raw-text or one
762 of the subsidiary according to the information just setup. */
763 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
765 val
= raw_text_coding_system (val
);
766 setup_coding_system (val
, &process_coding
);
767 process_coding
.dst_multibyte
768 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
770 process_coding
.src_multibyte
= 0;
775 if (output_to_buffer
)
777 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
778 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
779 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
780 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
783 EMACS_INT total_read
= 0;
785 bool display_on_the_fly
= display_p
;
786 struct coding_system saved_coding
;
788 saved_coding
= process_coding
;
791 /* Repeatedly read until we've filled as much as possible
792 of the buffer size we have. But don't read
793 less than 1024--save that for the next bufferful. */
795 while (nread
< bufsize
- 1024)
797 int this_read
= emacs_read (fd0
, buf
+ nread
,
805 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
810 total_read
+= this_read
;
812 if (display_on_the_fly
)
816 /* Now NREAD is the total amount of data in the buffer. */
821 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
822 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
823 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
825 { /* We have to decode the input. */
827 ptrdiff_t count1
= SPECPDL_INDEX ();
829 XSETBUFFER (curbuf
, current_buffer
);
830 /* We cannot allow after-change-functions be run
831 during decoding, because that might modify the
832 buffer, while we rely on process_coding.produced to
833 faithfully reflect inserted text until we
834 TEMP_SET_PT_BOTH below. */
835 specbind (Qinhibit_modification_hooks
, Qt
);
836 decode_coding_c_string (&process_coding
,
837 (unsigned char *) buf
, nread
, curbuf
);
838 unbind_to (count1
, Qnil
);
839 if (display_on_the_fly
840 && CODING_REQUIRE_DETECTION (&saved_coding
)
841 && ! CODING_REQUIRE_DETECTION (&process_coding
))
843 /* We have detected some coding system. But,
844 there's a possibility that the detection was
845 done by insufficient data. So, we give up
846 displaying on the fly. */
847 if (process_coding
.produced
> 0)
848 del_range_2 (process_coding
.dst_pos
,
849 process_coding
.dst_pos_byte
,
850 process_coding
.dst_pos
851 + process_coding
.produced_char
,
852 process_coding
.dst_pos_byte
853 + process_coding
.produced
, 0);
854 display_on_the_fly
= 0;
855 process_coding
= saved_coding
;
857 /* This is to make the above condition always
858 fails in the future. */
859 saved_coding
.common_flags
860 &= ~CODING_REQUIRE_DETECTION_MASK
;
864 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
865 PT_BYTE
+ process_coding
.produced
);
866 carryover
= process_coding
.carryover_bytes
;
868 memcpy (buf
, process_coding
.carryover
,
869 process_coding
.carryover_bytes
);
873 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
876 /* Make the buffer bigger as we continue to read more data,
877 but not past CALLPROC_BUFFER_SIZE_MAX. */
878 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
879 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
880 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
885 prepare_menu_bars ();
887 redisplay_preserve_echo_area (1);
888 /* This variable might have been set to 0 for code
889 detection. In that case, we set it back to 1 because
890 we should have already detected a coding system. */
891 display_on_the_fly
= 1;
898 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
899 /* If the caller required, let the buffer inherit the
900 coding-system used to decode the process output. */
901 if (inherit_process_coding_system
)
902 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
903 make_number (total_read
));
907 /* Wait for it to terminate, unless it already has. */
908 wait_for_termination (pid
, &status
, !output_to_buffer
);
913 /* Don't kill any children that the subprocess may have left behind
915 synch_process_pid
= 0;
918 unbind_to (count
, Qnil
);
920 if (WIFSIGNALED (status
))
924 synchronize_system_messages_locale ();
925 signame
= strsignal (WTERMSIG (status
));
930 return code_convert_string_norecord (build_string (signame
),
931 Vlocale_coding_system
, 0);
934 eassert (WIFEXITED (status
));
935 return make_number (WEXITSTATUS (status
));
939 delete_temp_file (Lisp_Object name
)
941 /* Suppress jka-compr handling, etc. */
942 ptrdiff_t count
= SPECPDL_INDEX ();
943 specbind (intern ("file-name-handler-alist"), Qnil
);
945 /* If this is called when the subprocess didn't exit yet, the
946 attempt to delete its input file will fail. In that case, we
947 schedule the file for deletion when the subprocess exits. This
948 is the 2nd part of handling this situation; see the call to
949 record_infile in call-process above, for the first part. */
950 if (!internal_delete_file (name
))
952 Lisp_Object encoded_file
= ENCODE_FILE (name
);
954 record_pending_deletion (SSDATA (encoded_file
));
957 internal_delete_file (name
);
959 unbind_to (count
, Qnil
);
963 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
965 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
966 The remaining arguments are optional.
967 Delete the text if fourth arg DELETE is non-nil.
969 Insert output in BUFFER before point; t means current buffer; nil for
970 BUFFER means discard it; 0 means discard and don't wait; and `(:file
971 FILE)', where FILE is a file name string, means that it should be
972 written to that file (if the file already exists it is overwritten).
973 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
974 REAL-BUFFER says what to do with standard output, as above,
975 while STDERR-FILE says what to do with standard error in the child.
976 STDERR-FILE may be nil (discard standard error output),
977 t (mix it with ordinary output), or a file name string.
979 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
980 Remaining args are passed to PROGRAM at startup as command args.
982 If BUFFER is 0, `call-process-region' returns immediately with value nil.
983 Otherwise it waits for PROGRAM to terminate
984 and returns a numeric exit status or a signal description string.
985 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
987 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
988 (ptrdiff_t nargs
, Lisp_Object
*args
)
991 Lisp_Object filename_string
;
992 register Lisp_Object start
, end
;
993 ptrdiff_t count
= SPECPDL_INDEX ();
994 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
995 Lisp_Object coding_systems
;
996 Lisp_Object val
, *args2
;
1000 if (STRINGP (Vtemporary_file_directory
))
1001 tmpdir
= Vtemporary_file_directory
;
1006 outf
= getenv ("TMPDIR");
1007 tmpdir
= build_string (outf
? outf
: "/tmp/");
1009 if ((outf
= egetenv ("TMPDIR"))
1010 || (outf
= egetenv ("TMP"))
1011 || (outf
= egetenv ("TEMP")))
1012 tmpdir
= build_string (outf
);
1014 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
1020 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
1021 Lisp_Object encoded_tem
;
1025 /* Cannot use the result of Fexpand_file_name, because it
1026 downcases the XXXXXX part of the pattern, and mktemp then
1027 doesn't recognize it. */
1028 if (!NILP (Vw32_downcase_file_names
))
1030 Lisp_Object dirname
= Ffile_name_directory (pattern
);
1033 pattern
= Vtemp_file_name_pattern
;
1035 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
1039 encoded_tem
= ENCODE_FILE (pattern
);
1040 tempfile
= SAFE_ALLOCA (SBYTES (encoded_tem
) + 1);
1041 memcpy (tempfile
, SDATA (encoded_tem
), SBYTES (encoded_tem
) + 1);
1042 coding_systems
= Qt
;
1044 #if defined HAVE_MKOSTEMP || defined HAVE_MKSTEMP
1049 # ifdef HAVE_MKOSTEMP
1050 fd
= mkostemp (tempfile
, O_CLOEXEC
);
1052 fd
= mkstemp (tempfile
);
1057 report_file_errno ("Failed to open temporary file",
1058 Fcons (build_string (tempfile
), Qnil
), open_errno
);
1065 report_file_error ("Failed to open temporary file using pattern",
1066 Fcons (pattern
, Qnil
));
1069 filename_string
= build_string (tempfile
);
1070 GCPRO1 (filename_string
);
1076 /* Decide coding-system of the contents of the temporary file. */
1077 if (!NILP (Vcoding_system_for_write
))
1078 val
= Vcoding_system_for_write
;
1079 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1084 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1085 args2
[0] = Qcall_process_region
;
1086 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1087 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1088 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1091 val
= complement_process_encoding_system (val
);
1094 ptrdiff_t count1
= SPECPDL_INDEX ();
1096 specbind (intern ("coding-system-for-write"), val
);
1097 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1098 happen to get a ".Z" suffix. */
1099 specbind (intern ("file-name-handler-alist"), Qnil
);
1100 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
1102 unbind_to (count1
, Qnil
);
1105 /* Note that Fcall_process takes care of binding
1106 coding-system-for-read. */
1108 record_unwind_protect (delete_temp_file
, filename_string
);
1110 if (nargs
> 3 && !NILP (args
[3]))
1111 Fdelete_region (start
, end
);
1123 args
[1] = filename_string
;
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
)
1188 #endif /* WINDOWSNT */
1190 pid_t pid
= getpid ();
1192 /* Note that use of alloca is always safe here. It's obvious for systems
1193 that do not have true vfork or that have true (stack) alloca.
1194 If using vfork and C_ALLOCA (when Emacs used to include
1195 src/alloca.c) it is safe because that changes the superior's
1196 static variables as if the superior had done alloca and will be
1197 cleaned up in the usual way. */
1199 register char *temp
;
1200 size_t i
; /* size_t, because ptrdiff_t might overflow here! */
1202 i
= SBYTES (current_dir
);
1204 /* MSDOS must have all environment variables malloc'ed, because
1205 low-level libc functions that launch subsidiary processes rely
1207 pwd_var
= xmalloc (i
+ 6);
1209 pwd_var
= alloca (i
+ 6);
1212 memcpy (pwd_var
, "PWD=", 4);
1213 memcpy (temp
, SDATA (current_dir
), i
);
1214 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
1218 /* We can't signal an Elisp error here; we're in a vfork. Since
1219 the callers check the current directory before forking, this
1220 should only return an error if the directory's permissions
1221 are changed between the check and this chdir, but we should
1223 if (chdir (temp
) < 0)
1224 _exit (EXIT_CANCELED
);
1226 /* Get past the drive letter, so that d:/ is left alone. */
1227 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1234 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1235 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1239 /* Set `env' to a vector of the strings in the environment. */
1241 register Lisp_Object tem
;
1242 register char **new_env
;
1244 register int new_length
;
1245 Lisp_Object display
= Qnil
;
1249 for (tem
= Vprocess_environment
;
1250 CONSP (tem
) && STRINGP (XCAR (tem
));
1253 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1254 && (SDATA (XCAR (tem
)) [7] == '\0'
1255 || SDATA (XCAR (tem
)) [7] == '='))
1256 /* DISPLAY is specified in process-environment. */
1261 /* If not provided yet, use the frame's DISPLAY. */
1264 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1265 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1266 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1267 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1268 Vinitial_environment
);
1276 /* new_length + 2 to include PWD and terminating 0. */
1277 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1278 /* If we have a PWD envvar, pass one down,
1279 but with corrected value. */
1280 if (egetenv ("PWD"))
1281 *new_env
++ = pwd_var
;
1283 if (STRINGP (display
))
1285 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1286 strcpy (vdata
, "DISPLAY=");
1287 strcat (vdata
, SSDATA (display
));
1288 new_env
= add_env (env
, new_env
, vdata
);
1292 for (tem
= Vprocess_environment
;
1293 CONSP (tem
) && STRINGP (XCAR (tem
));
1295 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1299 /* Remove variable names without values. */
1303 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1313 prepare_standard_handles (in
, out
, err
, handles
);
1314 set_process_dir (SDATA (current_dir
));
1315 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1316 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1317 reset_standard_handles (in
, out
, err
, handles
);
1319 /* An error occurred while trying to spawn the process. */
1320 report_file_error ("Spawning child process", Qnil
);
1323 #else /* not WINDOWSNT */
1324 /* Make sure that in, out, and err are not actually already in
1325 descriptors zero, one, or two; this could happen if Emacs is
1326 started with its standard in, out, or error closed, as might
1329 int oin
= in
, oout
= out
;
1331 /* We have to avoid relocating the same descriptor twice! */
1333 in
= relocate_fd (in
, 3);
1338 out
= relocate_fd (out
, 3);
1342 else if (err
== oout
)
1345 err
= relocate_fd (err
, 3);
1349 /* Redirect file descriptors and clear the close-on-exec flag on the
1350 redirected ones. IN, OUT, and ERR are close-on-exec so they
1351 need not be closed explicitly. */
1359 execve (new_argv
[0], new_argv
, env
);
1361 /* Don't output the program name here, as it can be arbitrarily long,
1362 and a long write from a vforked child to its parent can cause a
1364 emacs_perror ("child process");
1366 _exit (errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1369 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1372 /* An error occurred while trying to run the subprocess. */
1373 report_file_error ("Spawning child process", Qnil
);
1376 #endif /* not WINDOWSNT */
1380 /* Move the file descriptor FD so that its number is not less than MINFD.
1381 If the file descriptor is moved at all, the original is closed on MSDOS,
1382 but not elsewhere as the caller will close it anyway. */
1384 relocate_fd (int fd
, int minfd
)
1390 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1393 emacs_perror ("while setting up child");
1394 _exit (EXIT_CANCELED
);
1402 #endif /* not WINDOWSNT */
1405 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1406 ptrdiff_t *valuelen
, Lisp_Object env
)
1408 for (; CONSP (env
); env
= XCDR (env
))
1410 Lisp_Object entry
= XCAR (env
);
1412 && SBYTES (entry
) >= varlen
1414 /* NT environment variables are case insensitive. */
1415 && ! strnicmp (SDATA (entry
), var
, varlen
)
1416 #else /* not WINDOWSNT */
1417 && ! memcmp (SDATA (entry
), var
, varlen
)
1418 #endif /* not WINDOWSNT */
1421 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1423 *value
= SSDATA (entry
) + (varlen
+ 1);
1424 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1427 else if (SBYTES (entry
) == varlen
)
1429 /* Lone variable names in Vprocess_environment mean that
1430 variable should be removed from the environment. */
1440 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1441 ptrdiff_t *valuelen
, Lisp_Object frame
)
1443 /* Try to find VAR in Vprocess_environment first. */
1444 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1445 Vprocess_environment
))
1446 return *value
? 1 : 0;
1448 /* For DISPLAY try to get the values from the frame or the initial env. */
1449 if (strcmp (var
, "DISPLAY") == 0)
1452 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1453 if (STRINGP (display
))
1455 *value
= SSDATA (display
);
1456 *valuelen
= SBYTES (display
);
1459 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1460 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1461 Vinitial_environment
))
1462 return *value
? 1 : 0;
1468 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1469 doc
: /* Get the value of environment variable VARIABLE.
1470 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1471 the environment. Otherwise, value is a string.
1473 This function searches `process-environment' for VARIABLE.
1475 If optional parameter ENV is a list, then search this list instead of
1476 `process-environment', and return t when encountering a negative entry
1477 \(an entry for a variable with no value). */)
1478 (Lisp_Object variable
, Lisp_Object env
)
1483 CHECK_STRING (variable
);
1486 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1487 &value
, &valuelen
, env
))
1488 return value
? make_string (value
, valuelen
) : Qt
;
1492 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1493 &value
, &valuelen
, env
))
1494 return make_string (value
, valuelen
);
1499 /* A version of getenv that consults the Lisp environment lists,
1500 easily callable from C. */
1502 egetenv (const char *var
)
1507 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1514 /* This is run before init_cmdargs. */
1517 init_callproc_1 (void)
1520 const char *etc_dir
= ns_etc_directory ();
1521 const char *path_exec
= ns_exec_path ();
1524 Vdata_directory
= decode_env_path ("EMACSDATA",
1529 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1531 Vdoc_directory
= decode_env_path ("EMACSDOC",
1536 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1538 /* Check the EMACSPATH environment variable, defaulting to the
1539 PATH_EXEC path from epaths.h. */
1540 Vexec_path
= decode_env_path ("EMACSPATH",
1542 path_exec
? path_exec
:
1545 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1546 /* FIXME? For ns, path_exec should go at the front? */
1547 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1550 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1553 init_callproc (void)
1555 char *data_dir
= egetenv ("EMACSDATA");
1558 Lisp_Object tempdir
;
1562 const char *etc_dir
= ns_etc_directory ();
1565 data_dir
= alloca (strlen (etc_dir
) + 1);
1566 strcpy (data_dir
, etc_dir
);
1571 if (!NILP (Vinstallation_directory
))
1573 /* Add to the path the lib-src subdir of the installation dir. */
1575 tem
= Fexpand_file_name (build_string ("lib-src"),
1576 Vinstallation_directory
);
1578 /* MSDOS uses wrapped binaries, so don't do this. */
1579 if (NILP (Fmember (tem
, Vexec_path
)))
1582 const char *path_exec
= ns_exec_path ();
1584 Vexec_path
= decode_env_path ("EMACSPATH",
1586 path_exec
? path_exec
:
1589 Vexec_path
= Fcons (tem
, Vexec_path
);
1590 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1593 Vexec_directory
= Ffile_name_as_directory (tem
);
1594 #endif /* not MSDOS */
1596 /* Maybe use ../etc as well as ../lib-src. */
1599 tem
= Fexpand_file_name (build_string ("etc"),
1600 Vinstallation_directory
);
1601 Vdoc_directory
= Ffile_name_as_directory (tem
);
1605 /* Look for the files that should be in etc. We don't use
1606 Vinstallation_directory, because these files are never installed
1607 near the executable, and they are never in the build
1608 directory when that's different from the source directory.
1610 Instead, if these files are not in the nominal place, we try the
1611 source directory. */
1614 Lisp_Object tem
, tem1
, srcdir
;
1616 srcdir
= Fexpand_file_name (build_string ("../src/"),
1617 build_string (PATH_DUMPLOADSEARCH
));
1618 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1619 tem1
= Ffile_exists_p (tem
);
1620 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1623 newdir
= Fexpand_file_name (build_string ("../etc/"),
1624 build_string (PATH_DUMPLOADSEARCH
));
1625 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1626 tem1
= Ffile_exists_p (tem
);
1628 Vdata_directory
= newdir
;
1636 tempdir
= Fdirectory_file_name (Vexec_directory
);
1637 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1638 dir_warning ("arch-dependent data dir", Vexec_directory
);
1641 tempdir
= Fdirectory_file_name (Vdata_directory
);
1642 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1643 dir_warning ("arch-independent data dir", Vdata_directory
);
1645 sh
= getenv ("SHELL");
1646 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1649 Vshared_game_score_directory
= Qnil
;
1651 Vshared_game_score_directory
= build_string (PATH_GAME
);
1652 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1653 Vshared_game_score_directory
= Qnil
;
1658 set_initial_environment (void)
1661 for (envp
= environ
; *envp
; envp
++)
1662 Vprocess_environment
= Fcons (build_string (*envp
),
1663 Vprocess_environment
);
1664 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1665 to use `delete' and friends on process-environment. */
1666 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1670 syms_of_callproc (void)
1673 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1674 #elif defined (WINDOWSNT)
1675 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1677 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1679 staticpro (&Vtemp_file_name_pattern
);
1681 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1682 doc
: /* File name to load inferior shells from.
1683 Initialized from the SHELL environment variable, or to a system-dependent
1684 default if SHELL is not set. */);
1686 DEFVAR_LISP ("exec-path", Vexec_path
,
1687 doc
: /* List of directories to search programs to run in subprocesses.
1688 Each element is a string (directory name) or nil (try default directory). */);
1690 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1691 doc
: /* List of suffixes to try to find executable file names.
1692 Each element is a string. */);
1693 Vexec_suffixes
= Qnil
;
1695 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1696 doc
: /* Directory for executables for Emacs to invoke.
1697 More generally, this includes any architecture-dependent files
1698 that are built and installed from the Emacs distribution. */);
1700 DEFVAR_LISP ("data-directory", Vdata_directory
,
1701 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1702 These are files intended for Emacs to use while it runs. */);
1704 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1705 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1706 This is usually the same as `data-directory'. */);
1708 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1709 doc
: /* For internal use by the build procedure only.
1710 This is the name of the directory in which the build procedure installed
1711 Emacs's info files; the default value for `Info-default-directory-list'
1713 Vconfigure_info_directory
= build_string (PATH_INFO
);
1715 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1716 doc
: /* Directory of score files for games which come with GNU Emacs.
1717 If this variable is nil, then Emacs is unable to use a shared directory. */);
1719 Vshared_game_score_directory
= Qnil
;
1721 Vshared_game_score_directory
= build_string (PATH_GAME
);
1724 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1725 doc
: /* List of environment variables inherited from the parent process.
1726 Each element should be a string of the form ENVVARNAME=VALUE.
1727 The elements must normally be decoded (using `locale-coding-system') for use. */);
1728 Vinitial_environment
= Qnil
;
1730 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1731 doc
: /* List of overridden environment variables for subprocesses to inherit.
1732 Each element should be a string of the form ENVVARNAME=VALUE.
1734 Entries in this list take precedence to those in the frame-local
1735 environments. Therefore, let-binding `process-environment' is an easy
1736 way to temporarily change the value of an environment variable,
1737 irrespective of where it comes from. To use `process-environment' to
1738 remove an environment variable, include only its name in the list,
1741 This variable is set to nil when Emacs starts.
1743 If multiple entries define the same variable, the first one always
1746 Non-ASCII characters are encoded according to the initial value of
1747 `locale-coding-system', i.e. the elements must normally be decoded for
1750 See `setenv' and `getenv'. */);
1751 Vprocess_environment
= Qnil
;
1753 defsubr (&Scall_process
);
1754 defsubr (&Sgetenv_internal
);
1755 defsubr (&Scall_process_region
);