1 /* Synchronous subprocess invocation for GNU Emacs.
3 Copyright (C) 1985-1988, 1993-1995, 1999-2014 Free Software Foundation,
6 This file is part of GNU Emacs.
8 GNU Emacs is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 GNU Emacs is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
25 #include <sys/types.h>
35 #include <sys/socket.h> /* for fcntl */
38 #define _P_NOWAIT 1 /* from process.h */
41 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
43 #include <sys/param.h>
47 #include "character.h"
51 #include "composite.h"
54 #include "syssignal.h"
57 #include "blockinput.h"
59 #include "termhooks.h"
69 /* Pattern used by call-process-region to make temp files. */
70 static Lisp_Object Vtemp_file_name_pattern
;
72 /* The next two variables are used while record-unwind-protect is in place
73 during call-process for a subprocess for which record_deleted_pid has
74 not yet been called. At other times, synch_process_pid is zero and
75 synch_process_tempfile's contents are irrelevant. Doing this via static
76 C variables is more convenient than putting them into the arguments
77 of record-unwind-protect, as they need to be updated at randomish
78 times in the code, and Lisp cannot always store these values as
79 Emacs integers. It's safe to use static variables here, as the
80 code is never invoked reentrantly. */
82 /* If nonzero, a process-ID that has not been reaped. */
83 static pid_t synch_process_pid
;
85 /* If a string, the name of a temp file that has not been removed. */
87 static Lisp_Object synch_process_tempfile
;
89 # define synch_process_tempfile make_number (0)
92 /* Indexes of file descriptors that need closing on call_process_kill. */
95 /* The subsidiary process's stdout and stderr. stdin is handled
96 separately, in either Fcall_process_region or create_temp_file. */
97 CALLPROC_STDOUT
, CALLPROC_STDERR
,
99 /* How to read from a pipe (or substitute) from the subsidiary process. */
102 /* A bound on the number of file descriptors. */
106 static Lisp_Object
call_process (ptrdiff_t, Lisp_Object
*, int, ptrdiff_t);
108 /* Return the current buffer's working directory, or the home
109 directory if it's unreachable, as a string suitable for a system call.
110 Signal an error if the result would not be an accessible directory. */
113 encode_current_directory (void)
118 dir
= BVAR (current_buffer
, directory
);
121 dir
= Funhandled_file_name_directory (dir
);
123 /* If the file name handler says that dir is unreachable, use
124 a sensible default. */
126 dir
= build_string ("~");
128 dir
= expand_and_dir_to_file (dir
, Qnil
);
130 if (STRING_MULTIBYTE (dir
))
131 dir
= ENCODE_FILE (dir
);
132 if (! file_accessible_directory_p (SSDATA (dir
)))
133 report_file_error ("Setting current directory",
134 BVAR (current_buffer
, directory
));
136 RETURN_UNGCPRO (dir
);
139 /* If P is reapable, record it as a deleted process and kill it.
140 Do this in a critical section. Unless PID is wedged it will be
141 reaped on receipt of the first SIGCHLD after the critical section. */
144 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
148 block_child_signal (&oldset
);
152 record_deleted_pid (p
->pid
, tempfile
);
154 kill (- p
->pid
, SIGKILL
);
157 unblock_child_signal (&oldset
);
161 /* Clean up files, file descriptors and processes created by Fcall_process. */
164 delete_temp_file (Lisp_Object name
)
166 unlink (SSDATA (name
));
170 call_process_kill (void *ptr
)
172 int *callproc_fd
= ptr
;
174 for (i
= 0; i
< CALLPROC_FDS
; i
++)
175 if (0 <= callproc_fd
[i
])
176 emacs_close (callproc_fd
[i
]);
178 if (synch_process_pid
)
180 struct Lisp_Process proc
;
182 proc
.pid
= synch_process_pid
;
183 record_kill_process (&proc
, synch_process_tempfile
);
184 synch_process_pid
= 0;
186 else if (STRINGP (synch_process_tempfile
))
187 delete_temp_file (synch_process_tempfile
);
190 /* Clean up when exiting Fcall_process: restore the buffer, and
191 kill the subsidiary process group if the process still exists. */
194 call_process_cleanup (Lisp_Object buffer
)
196 Fset_buffer (buffer
);
199 if (synch_process_pid
)
201 kill (-synch_process_pid
, SIGINT
);
202 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
205 wait_for_termination (synch_process_pid
, 0, 1);
206 synch_process_pid
= 0;
208 message1 ("Waiting for process to die...done");
214 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
216 static mode_t
const default_output_mode
= 0666;
219 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
220 doc
: /* Call PROGRAM synchronously in separate process.
221 The remaining arguments are optional.
222 The program's input comes from file INFILE (nil means `/dev/null').
223 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
224 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
225 FILE is a file name string, means that it should be written to that file
226 \(if the file already exists it is overwritten).
227 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
228 REAL-BUFFER says what to do with standard output, as above,
229 while STDERR-FILE says what to do with standard error in the child.
230 STDERR-FILE may be nil (discard standard error output),
231 t (mix it with ordinary output), or a file name string.
233 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
234 Remaining arguments are strings passed as command arguments to PROGRAM.
236 If executable PROGRAM can't be found as an executable, `call-process'
237 signals a Lisp error. `call-process' reports errors in execution of
238 the program only through its return and output.
240 If DESTINATION is 0, `call-process' returns immediately with value nil.
241 Otherwise it waits for PROGRAM to terminate
242 and returns a numeric exit status or a signal description string.
243 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
245 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
246 (ptrdiff_t nargs
, Lisp_Object
*args
)
248 Lisp_Object infile
, encoded_infile
;
251 ptrdiff_t count
= SPECPDL_INDEX ();
253 if (nargs
>= 2 && ! NILP (args
[1]))
255 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
256 CHECK_STRING (infile
);
259 infile
= build_string (NULL_DEVICE
);
262 encoded_infile
= STRING_MULTIBYTE (infile
) ? ENCODE_FILE (infile
) : infile
;
264 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
266 report_file_error ("Opening process input file", infile
);
267 record_unwind_protect_int (close_file_unwind
, filefd
);
269 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
272 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
274 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
275 unwinder that is intended to remove the input temporary file; in
276 this case NARGS must be at least 2 and ARGS[1] is the file's name.
278 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
281 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
282 ptrdiff_t tempfile_index
)
284 Lisp_Object buffer
, current_dir
, path
;
287 int callproc_fd
[CALLPROC_FDS
];
290 ptrdiff_t count
= SPECPDL_INDEX ();
294 /* File to use for stderr in the child.
295 t means use same as standard output. */
296 Lisp_Object error_file
;
297 Lisp_Object output_file
= Qnil
;
298 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
299 char *tempfile
= NULL
;
306 int fd_output
, fd_error
;
307 struct coding_system process_coding
; /* coding-system of process output */
308 struct coding_system argument_coding
; /* coding-system of arguments */
309 /* Set to the return value of Ffind_operation_coding_system. */
310 Lisp_Object coding_systems
;
313 if (synch_process_pid
)
314 error ("call-process invoked recursively");
316 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
319 CHECK_STRING (args
[0]);
324 /* Without asynchronous processes we cannot have BUFFER == 0. */
326 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
327 error ("Operating system cannot handle asynchronous subprocesses");
328 #endif /* subprocesses */
330 /* Decide the coding-system for giving arguments. */
332 Lisp_Object val
, *args2
;
334 /* If arguments are supplied, we may have to encode them. */
337 bool must_encode
= 0;
338 Lisp_Object coding_attrs
;
340 for (i
= 4; i
< nargs
; i
++)
341 CHECK_STRING (args
[i
]);
343 for (i
= 4; i
< nargs
; i
++)
344 if (STRING_MULTIBYTE (args
[i
]))
347 if (!NILP (Vcoding_system_for_write
))
348 val
= Vcoding_system_for_write
;
349 else if (! must_encode
)
353 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
354 args2
[0] = Qcall_process
;
355 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
356 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
357 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
359 val
= complement_process_encoding_system (val
);
360 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
361 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
362 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
364 /* We should not use an ASCII incompatible coding system. */
365 val
= raw_text_coding_system (val
);
366 setup_coding_system (val
, &argument_coding
);
377 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
378 FILE-FOR-STDERR), unless the first element is :file, in which case see
379 the next paragraph. */
380 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
382 if (CONSP (XCDR (buffer
)))
384 Lisp_Object stderr_file
;
385 stderr_file
= XCAR (XCDR (buffer
));
387 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
388 error_file
= stderr_file
;
390 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
393 buffer
= XCAR (buffer
);
396 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
397 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
399 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
400 BVAR (current_buffer
, directory
));
401 CHECK_STRING (output_file
);
405 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
407 Lisp_Object spec_buffer
;
408 spec_buffer
= buffer
;
409 buffer
= Fget_buffer_create (buffer
);
410 /* Mention the buffer name for a better error message. */
412 CHECK_BUFFER (spec_buffer
);
413 CHECK_BUFFER (buffer
);
417 /* Make sure that the child will be able to chdir to the current
418 buffer's current directory, or its unhandled equivalent. We
419 can't just have the child check for an error when it does the
420 chdir, since it's in a vfork.
422 We have to GCPRO around this because Fexpand_file_name,
423 Funhandled_file_name_directory, and Ffile_accessible_directory_p
424 might call a file name handling function. The argument list is
425 protected by the caller, so all we really have to worry about is
428 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
430 current_dir
= encode_current_directory ();
432 GCPRO4 (buffer
, current_dir
, error_file
, output_file
);
434 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
435 error_file
= ENCODE_FILE (error_file
);
436 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
437 output_file
= ENCODE_FILE (output_file
);
441 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
443 for (i
= 0; i
< CALLPROC_FDS
; i
++)
446 synch_process_tempfile
= make_number (0);
448 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
450 /* Search for program; barf if not found. */
452 struct gcpro gcpro1
, gcpro2
, gcpro3
;
455 GCPRO3 (buffer
, current_dir
, error_file
);
456 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
,
457 make_number (X_OK
), false);
460 report_file_error ("Searching for program", args
[0]);
463 /* If program file name starts with /: for quoting a magic name,
465 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
466 && SREF (path
, 1) == ':')
467 path
= Fsubstring (path
, make_number (2), Qnil
);
469 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
472 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
474 GCPRO4 (buffer
, current_dir
, path
, error_file
);
479 argument_coding
.dst_multibyte
= 0;
480 for (i
= 4; i
< nargs
; i
++)
482 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
483 if (CODING_REQUIRE_ENCODING (&argument_coding
))
484 /* We must encode this argument. */
485 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
487 for (i
= 4; i
< nargs
; i
++)
488 new_argv
[i
- 3] = SSDATA (args
[i
]);
493 if (STRING_MULTIBYTE (path
))
494 path
= ENCODE_FILE (path
);
495 new_argv
[0] = SSDATA (path
);
499 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
502 if (! discard_output
&& ! STRINGP (output_file
))
504 char const *tmpdir
= egetenv ("TMPDIR");
505 char const *outf
= tmpdir
? tmpdir
: "";
506 tempfile
= alloca (strlen (outf
) + 20);
507 strcpy (tempfile
, outf
);
508 dostounix_filename (tempfile
);
509 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
510 strcat (tempfile
, "/");
511 strcat (tempfile
, "emXXXXXX");
514 report_file_error ("Opening process output file", Qnil
);
515 output_file
= build_string (tempfile
);
516 synch_process_tempfile
= output_file
;
522 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
524 report_file_error ("Opening null device", Qnil
);
526 else if (STRINGP (output_file
))
528 fd_output
= emacs_open (SSDATA (output_file
),
529 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
530 default_output_mode
);
533 int open_errno
= errno
;
534 output_file
= DECODE_FILE (output_file
);
535 report_file_errno ("Opening process output file",
536 output_file
, open_errno
);
542 if (emacs_pipe (fd
) != 0)
543 report_file_error ("Creating process pipe", Qnil
);
544 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
547 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
549 fd_error
= fd_output
;
551 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
553 fd_error
= emacs_open ((STRINGP (error_file
)
554 ? SSDATA (error_file
)
556 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
557 default_output_mode
);
560 int open_errno
= errno
;
561 report_file_errno ("Cannot redirect stderr",
562 (STRINGP (error_file
)
563 ? DECODE_FILE (error_file
)
564 : build_string (NULL_DEVICE
)),
567 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
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
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
578 unbind_to (count
, Qnil
);
579 synchronize_system_messages_locale ();
581 code_convert_string_norecord (build_string (strerror (child_errno
)),
582 Vlocale_coding_system
, 0);
586 for (i
= 0; i
< CALLPROC_FDS
; i
++)
587 if (0 <= callproc_fd
[i
])
589 emacs_close (callproc_fd
[i
]);
592 emacs_close (filefd
);
593 clear_unwind_protect (count
- 1);
597 /* Since CRLF is converted to LF within `decode_coding', we
598 can always open a file with binary mode. */
599 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
600 O_RDONLY
| O_BINARY
, 0);
601 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
603 int open_errno
= errno
;
604 report_file_errno ("Cannot re-open temporary file",
605 build_string (tempfile
), open_errno
);
611 /* Do the unwind-protect now, even though the pid is not known, so
612 that no storage allocation is done in the critical section.
613 The actual PID will be filled in during the critical section. */
614 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
619 block_child_signal (&oldset
);
622 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
623 #else /* not WINDOWSNT */
625 /* vfork, and prevent local vars from being clobbered by the vfork. */
627 Lisp_Object
volatile buffer_volatile
= buffer
;
628 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
629 Lisp_Object
volatile current_dir_volatile
= current_dir
;
630 bool volatile display_p_volatile
= display_p
;
631 bool volatile sa_must_free_volatile
= sa_must_free
;
632 int volatile fd_error_volatile
= fd_error
;
633 int volatile filefd_volatile
= filefd
;
634 ptrdiff_t volatile count_volatile
= count
;
635 ptrdiff_t volatile sa_count_volatile
= sa_count
;
636 char **volatile new_argv_volatile
= new_argv
;
637 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
638 for (i
= 0; i
< CALLPROC_FDS
; i
++)
639 callproc_fd_volatile
[i
] = callproc_fd
[i
];
643 buffer
= buffer_volatile
;
644 coding_systems
= coding_systems_volatile
;
645 current_dir
= current_dir_volatile
;
646 display_p
= display_p_volatile
;
647 sa_must_free
= sa_must_free_volatile
;
648 fd_error
= fd_error_volatile
;
649 filefd
= filefd_volatile
;
650 count
= count_volatile
;
651 sa_count
= sa_count_volatile
;
652 new_argv
= new_argv_volatile
;
654 for (i
= 0; i
< CALLPROC_FDS
; i
++)
655 callproc_fd
[i
] = callproc_fd_volatile
[i
];
656 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
661 unblock_child_signal (&oldset
);
665 /* Emacs ignores SIGPIPE, but the child should not. */
666 signal (SIGPIPE
, SIG_DFL
);
667 /* Likewise for SIGPROF. */
669 signal (SIGPROF
, SIG_DFL
);
672 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
675 #endif /* not WINDOWSNT */
681 synch_process_pid
= pid
;
683 if (INTEGERP (buffer
))
685 if (tempfile_index
< 0)
686 record_deleted_pid (pid
, Qnil
);
690 record_deleted_pid (pid
, args
[1]);
691 clear_unwind_protect (tempfile_index
);
693 synch_process_pid
= 0;
697 unblock_child_signal (&oldset
);
701 report_file_errno ("Doing vfork", Qnil
, child_errno
);
703 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
704 since we will use that to read input from. */
705 for (i
= 0; i
< CALLPROC_FDS
; i
++)
706 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
708 emacs_close (callproc_fd
[i
]);
711 emacs_close (filefd
);
712 clear_unwind_protect (count
- 1);
714 #endif /* not MSDOS */
716 if (INTEGERP (buffer
))
717 return unbind_to (count
, Qnil
);
719 if (BUFFERP (buffer
))
720 Fset_buffer (buffer
);
722 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
726 Lisp_Object val
, *args2
;
729 if (!NILP (Vcoding_system_for_read
))
730 val
= Vcoding_system_for_read
;
733 if (EQ (coding_systems
, Qt
))
737 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
738 args2
[0] = Qcall_process
;
739 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
741 = Ffind_operation_coding_system (nargs
+ 1, args2
);
743 if (CONSP (coding_systems
))
744 val
= XCAR (coding_systems
);
745 else if (CONSP (Vdefault_process_coding_system
))
746 val
= XCAR (Vdefault_process_coding_system
);
750 Fcheck_coding_system (val
);
751 /* In unibyte mode, character code conversion should not take
752 place but EOL conversion should. So, setup raw-text or one
753 of the subsidiary according to the information just setup. */
754 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
756 val
= raw_text_coding_system (val
);
757 setup_coding_system (val
, &process_coding
);
758 process_coding
.dst_multibyte
759 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
760 process_coding
.src_multibyte
= 0;
768 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
769 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
770 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
771 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
773 EMACS_INT total_read
= 0;
775 bool display_on_the_fly
= display_p
;
776 struct coding_system saved_coding
= process_coding
;
780 /* Repeatedly read until we've filled as much as possible
781 of the buffer size we have. But don't read
782 less than 1024--save that for the next bufferful. */
784 while (nread
< bufsize
- 1024)
786 int this_read
= emacs_read (fd0
, buf
+ nread
,
794 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
799 total_read
+= this_read
;
801 if (display_on_the_fly
)
805 /* Now NREAD is the total amount of data in the buffer. */
808 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
809 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
810 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
812 { /* We have to decode the input. */
814 ptrdiff_t count1
= SPECPDL_INDEX ();
816 XSETBUFFER (curbuf
, current_buffer
);
817 prepare_to_modify_buffer (PT
, PT
, NULL
);
818 /* We cannot allow after-change-functions be run
819 during decoding, because that might modify the
820 buffer, while we rely on process_coding.produced to
821 faithfully reflect inserted text until we
822 TEMP_SET_PT_BOTH below. */
823 specbind (Qinhibit_modification_hooks
, Qt
);
824 decode_coding_c_string (&process_coding
,
825 (unsigned char *) buf
, nread
, curbuf
);
826 unbind_to (count1
, Qnil
);
827 if (display_on_the_fly
828 && CODING_REQUIRE_DETECTION (&saved_coding
)
829 && ! CODING_REQUIRE_DETECTION (&process_coding
))
831 /* We have detected some coding system, but the
832 detection may have been via insufficient data.
833 So give up displaying on the fly. */
834 if (process_coding
.produced
> 0)
835 del_range_2 (process_coding
.dst_pos
,
836 process_coding
.dst_pos_byte
,
837 (process_coding
.dst_pos
838 + process_coding
.produced_char
),
839 (process_coding
.dst_pos_byte
840 + process_coding
.produced
),
842 display_on_the_fly
= 0;
843 process_coding
= saved_coding
;
845 /* Make the above condition always fail in the future. */
846 saved_coding
.common_flags
847 &= ~CODING_REQUIRE_DETECTION_MASK
;
851 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
852 PT_BYTE
+ process_coding
.produced
);
853 carryover
= process_coding
.carryover_bytes
;
855 memcpy (buf
, process_coding
.carryover
,
856 process_coding
.carryover_bytes
);
859 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
862 /* Make the buffer bigger as we continue to read more data,
863 but not past CALLPROC_BUFFER_SIZE_MAX. */
864 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
865 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
866 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
870 redisplay_preserve_echo_area (1);
871 /* This variable might have been set to 0 for code
872 detection. In that case, set it back to 1 because
873 we should have already detected a coding system. */
874 display_on_the_fly
= 1;
881 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
882 /* If the caller required, let the buffer inherit the
883 coding-system used to decode the process output. */
884 if (inherit_process_coding_system
)
885 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
886 make_number (total_read
));
890 /* Wait for it to terminate, unless it already has. */
891 wait_for_termination (pid
, &status
, fd0
< 0);
896 /* Don't kill any children that the subprocess may have left behind
898 synch_process_pid
= 0;
901 unbind_to (count
, Qnil
);
903 if (WIFSIGNALED (status
))
907 synchronize_system_messages_locale ();
908 signame
= strsignal (WTERMSIG (status
));
913 return code_convert_string_norecord (build_string (signame
),
914 Vlocale_coding_system
, 0);
917 eassert (WIFEXITED (status
));
918 return make_number (WEXITSTATUS (status
));
921 /* Create a temporary file suitable for storing the input data of
922 call-process-region. NARGS and ARGS are the same as for
923 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
924 naming the file, and return a file descriptor for reading.
925 Unwind-protect the file, so that the file descriptor will be closed
926 and the file removed when the caller unwinds the specpdl stack. */
929 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
930 Lisp_Object
*filename_string_ptr
)
934 Lisp_Object filename_string
;
935 Lisp_Object val
, start
, end
;
938 if (STRINGP (Vtemporary_file_directory
))
939 tmpdir
= Vtemporary_file_directory
;
944 outf
= getenv ("TMPDIR");
945 tmpdir
= build_string (outf
? outf
: "/tmp/");
947 if ((outf
= egetenv ("TMPDIR"))
948 || (outf
= egetenv ("TMP"))
949 || (outf
= egetenv ("TEMP")))
950 tmpdir
= build_string (outf
);
952 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
957 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
962 /* Cannot use the result of Fexpand_file_name, because it
963 downcases the XXXXXX part of the pattern, and mktemp then
964 doesn't recognize it. */
965 if (!NILP (Vw32_downcase_file_names
))
967 Lisp_Object dirname
= Ffile_name_directory (pattern
);
970 pattern
= Vtemp_file_name_pattern
;
972 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
976 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
977 GCPRO1 (filename_string
);
978 tempfile
= SSDATA (filename_string
);
980 count
= SPECPDL_INDEX ();
981 record_unwind_protect_nothing ();
982 fd
= mkostemp (tempfile
, O_CLOEXEC
);
984 report_file_error ("Failed to open temporary file using pattern",
986 set_unwind_protect (count
, delete_temp_file
, filename_string
);
987 record_unwind_protect_int (close_file_unwind
, fd
);
992 /* Decide coding-system of the contents of the temporary file. */
993 if (!NILP (Vcoding_system_for_write
))
994 val
= Vcoding_system_for_write
;
995 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
999 Lisp_Object coding_systems
;
1002 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1003 args2
[0] = Qcall_process_region
;
1004 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1005 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1006 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1009 val
= complement_process_encoding_system (val
);
1012 ptrdiff_t count1
= SPECPDL_INDEX ();
1014 specbind (intern ("coding-system-for-write"), val
);
1015 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1016 happen to get a ".Z" suffix. */
1017 specbind (intern ("file-name-handler-alist"), Qnil
);
1018 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1020 unbind_to (count1
, Qnil
);
1023 if (lseek (fd
, 0, SEEK_SET
) < 0)
1024 report_file_error ("Setting file position", filename_string
);
1026 /* Note that Fcall_process takes care of binding
1027 coding-system-for-read. */
1029 *filename_string_ptr
= filename_string
;
1034 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1036 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1037 The remaining arguments are optional.
1038 Delete the text if fourth arg DELETE is non-nil.
1040 Insert output in BUFFER before point; t means current buffer; nil for
1041 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1042 FILE)', where FILE is a file name string, means that it should be
1043 written to that file (if the file already exists it is overwritten).
1044 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1045 REAL-BUFFER says what to do with standard output, as above,
1046 while STDERR-FILE says what to do with standard error in the child.
1047 STDERR-FILE may be nil (discard standard error output),
1048 t (mix it with ordinary output), or a file name string.
1050 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1051 Remaining args are passed to PROGRAM at startup as command args.
1053 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1054 Otherwise it waits for PROGRAM to terminate
1055 and returns a numeric exit status or a signal description string.
1056 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1058 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1059 (ptrdiff_t nargs
, Lisp_Object
*args
)
1061 struct gcpro gcpro1
;
1062 Lisp_Object infile
, val
;
1063 ptrdiff_t count
= SPECPDL_INDEX ();
1064 Lisp_Object start
= args
[0];
1065 Lisp_Object end
= args
[1];
1069 if (STRINGP (start
))
1070 empty_input
= SCHARS (start
) == 0;
1071 else if (NILP (start
))
1072 empty_input
= BEG
== Z
;
1075 validate_region (&args
[0], &args
[1]);
1078 empty_input
= XINT (start
) == XINT (end
);
1082 fd
= create_temp_file (nargs
, args
, &infile
);
1086 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1088 report_file_error ("Opening null device", Qnil
);
1089 record_unwind_protect_int (close_file_unwind
, fd
);
1094 if (nargs
> 3 && !NILP (args
[3]))
1095 Fdelete_region (start
, end
);
1109 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1110 RETURN_UNGCPRO (unbind_to (count
, val
));
1114 static int relocate_fd (int fd
, int minfd
);
1118 add_env (char **env
, char **new_env
, char *string
)
1125 /* See if this string duplicates any string already in the env.
1126 If so, don't put it in.
1127 When an env var has multiple definitions,
1128 we keep the definition that comes first in process-environment. */
1129 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1131 char *p
= *ep
, *q
= string
;
1137 /* The string is a lone variable name; keep it for now, we
1138 will remove it later. It is a placeholder for a
1139 variable that is not to be included in the environment. */
1147 *new_env
++ = string
;
1151 /* This is the last thing run in a newly forked inferior
1152 either synchronous or asynchronous.
1153 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1154 Initialize inferior's priority, pgrp, connected dir and environment.
1155 then exec another program based on new_argv.
1157 If SET_PGRP, put the subprocess into a separate process group.
1159 CURRENT_DIR is an elisp string giving the path of the current
1160 directory the subprocess should have. Since we can't really signal
1161 a decent error from within the child, this should be verified as an
1162 executable directory by the parent. */
1165 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1166 Lisp_Object current_dir
)
1176 pid_t pid
= getpid ();
1177 #endif /* WINDOWSNT */
1179 /* Note that use of alloca is always safe here. It's obvious for systems
1180 that do not have true vfork or that have true (stack) alloca.
1181 If using vfork and C_ALLOCA (when Emacs used to include
1182 src/alloca.c) it is safe because that changes the superior's
1183 static variables as if the superior had done alloca and will be
1184 cleaned up in the usual way. */
1189 i
= SBYTES (current_dir
);
1191 /* MSDOS must have all environment variables malloc'ed, because
1192 low-level libc functions that launch subsidiary processes rely
1194 pwd_var
= xmalloc (i
+ 5);
1196 pwd_var
= alloca (i
+ 5);
1199 memcpy (pwd_var
, "PWD=", 4);
1200 strcpy (temp
, SSDATA (current_dir
));
1203 /* We can't signal an Elisp error here; we're in a vfork. Since
1204 the callers check the current directory before forking, this
1205 should only return an error if the directory's permissions
1206 are changed between the check and this chdir, but we should
1208 if (chdir (temp
) < 0)
1209 _exit (EXIT_CANCELED
);
1211 /* Get past the drive letter, so that d:/ is left alone. */
1212 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1219 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1220 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1224 /* Set `env' to a vector of the strings in the environment. */
1226 register Lisp_Object tem
;
1227 register char **new_env
;
1229 register int new_length
;
1230 Lisp_Object display
= Qnil
;
1234 for (tem
= Vprocess_environment
;
1235 CONSP (tem
) && STRINGP (XCAR (tem
));
1238 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1239 && (SDATA (XCAR (tem
)) [7] == '\0'
1240 || SDATA (XCAR (tem
)) [7] == '='))
1241 /* DISPLAY is specified in process-environment. */
1246 /* If not provided yet, use the frame's DISPLAY. */
1249 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1250 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1251 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1252 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1253 Vinitial_environment
);
1261 /* new_length + 2 to include PWD and terminating 0. */
1262 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1263 /* If we have a PWD envvar, pass one down,
1264 but with corrected value. */
1265 if (egetenv ("PWD"))
1266 *new_env
++ = pwd_var
;
1268 if (STRINGP (display
))
1270 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1271 strcpy (vdata
, "DISPLAY=");
1272 strcat (vdata
, SSDATA (display
));
1273 new_env
= add_env (env
, new_env
, vdata
);
1277 for (tem
= Vprocess_environment
;
1278 CONSP (tem
) && STRINGP (XCAR (tem
));
1280 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1284 /* Remove variable names without values. */
1288 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1298 prepare_standard_handles (in
, out
, err
, handles
);
1299 set_process_dir (SDATA (current_dir
));
1300 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1301 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1302 reset_standard_handles (in
, out
, err
, handles
);
1304 /* An error occurred while trying to spawn the process. */
1305 report_file_error ("Spawning child process", Qnil
);
1308 #else /* not WINDOWSNT */
1309 /* Make sure that in, out, and err are not actually already in
1310 descriptors zero, one, or two; this could happen if Emacs is
1311 started with its standard in, out, or error closed, as might
1314 int oin
= in
, oout
= out
;
1316 /* We have to avoid relocating the same descriptor twice! */
1318 in
= relocate_fd (in
, 3);
1323 out
= relocate_fd (out
, 3);
1327 else if (err
== oout
)
1330 err
= relocate_fd (err
, 3);
1334 /* Redirect file descriptors and clear the close-on-exec flag on the
1335 redirected ones. IN, OUT, and ERR are close-on-exec so they
1336 need not be closed explicitly. */
1344 execve (new_argv
[0], new_argv
, env
);
1347 /* Avoid deadlock if the child's perror writes to a full pipe; the
1348 pipe's reader is the parent, but with vfork the parent can't
1349 run until the child exits. Truncate the diagnostic instead. */
1350 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1353 emacs_perror (new_argv
[0]);
1354 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1357 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1360 /* An error occurred while trying to run the subprocess. */
1361 report_file_error ("Spawning child process", Qnil
);
1364 #endif /* not WINDOWSNT */
1368 /* Move the file descriptor FD so that its number is not less than MINFD.
1369 If the file descriptor is moved at all, the original is closed on MSDOS,
1370 but not elsewhere as the caller will close it anyway. */
1372 relocate_fd (int fd
, int minfd
)
1378 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1381 emacs_perror ("while setting up child");
1382 _exit (EXIT_CANCELED
);
1390 #endif /* not WINDOWSNT */
1393 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1394 ptrdiff_t *valuelen
, Lisp_Object env
)
1396 for (; CONSP (env
); env
= XCDR (env
))
1398 Lisp_Object entry
= XCAR (env
);
1400 && SBYTES (entry
) >= varlen
1402 /* NT environment variables are case insensitive. */
1403 && ! strnicmp (SDATA (entry
), var
, varlen
)
1404 #else /* not WINDOWSNT */
1405 && ! memcmp (SDATA (entry
), var
, varlen
)
1406 #endif /* not WINDOWSNT */
1409 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1411 *value
= SSDATA (entry
) + (varlen
+ 1);
1412 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1415 else if (SBYTES (entry
) == varlen
)
1417 /* Lone variable names in Vprocess_environment mean that
1418 variable should be removed from the environment. */
1428 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1429 ptrdiff_t *valuelen
, Lisp_Object frame
)
1431 /* Try to find VAR in Vprocess_environment first. */
1432 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1433 Vprocess_environment
))
1434 return *value
? 1 : 0;
1436 /* For DISPLAY try to get the values from the frame or the initial env. */
1437 if (strcmp (var
, "DISPLAY") == 0)
1440 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1441 if (STRINGP (display
))
1443 *value
= SSDATA (display
);
1444 *valuelen
= SBYTES (display
);
1447 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1448 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1449 Vinitial_environment
))
1450 return *value
? 1 : 0;
1456 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1457 doc
: /* Get the value of environment variable VARIABLE.
1458 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1459 the environment. Otherwise, value is a string.
1461 This function searches `process-environment' for VARIABLE.
1463 If optional parameter ENV is a list, then search this list instead of
1464 `process-environment', and return t when encountering a negative entry
1465 \(an entry for a variable with no value). */)
1466 (Lisp_Object variable
, Lisp_Object env
)
1471 CHECK_STRING (variable
);
1474 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1475 &value
, &valuelen
, env
))
1476 return value
? make_string (value
, valuelen
) : Qt
;
1480 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1481 &value
, &valuelen
, env
))
1482 return make_string (value
, valuelen
);
1487 /* A version of getenv that consults the Lisp environment lists,
1488 easily callable from C. */
1490 egetenv (const char *var
)
1495 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1502 /* This is run before init_cmdargs. */
1505 init_callproc_1 (void)
1508 const char *etc_dir
= ns_etc_directory ();
1509 const char *path_exec
= ns_exec_path ();
1512 Vdata_directory
= decode_env_path ("EMACSDATA",
1517 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1519 Vdoc_directory
= decode_env_path ("EMACSDOC",
1524 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1526 /* Check the EMACSPATH environment variable, defaulting to the
1527 PATH_EXEC path from epaths.h. */
1528 Vexec_path
= decode_env_path ("EMACSPATH",
1530 path_exec
? path_exec
:
1533 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1534 /* FIXME? For ns, path_exec should go at the front? */
1535 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1538 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1541 init_callproc (void)
1543 char *data_dir
= egetenv ("EMACSDATA");
1546 Lisp_Object tempdir
;
1550 const char *etc_dir
= ns_etc_directory ();
1553 data_dir
= alloca (strlen (etc_dir
) + 1);
1554 strcpy (data_dir
, etc_dir
);
1559 if (!NILP (Vinstallation_directory
))
1561 /* Add to the path the lib-src subdir of the installation dir. */
1563 tem
= Fexpand_file_name (build_string ("lib-src"),
1564 Vinstallation_directory
);
1566 /* MSDOS uses wrapped binaries, so don't do this. */
1567 if (NILP (Fmember (tem
, Vexec_path
)))
1570 const char *path_exec
= ns_exec_path ();
1572 Vexec_path
= decode_env_path ("EMACSPATH",
1574 path_exec
? path_exec
:
1577 Vexec_path
= Fcons (tem
, Vexec_path
);
1578 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1581 Vexec_directory
= Ffile_name_as_directory (tem
);
1582 #endif /* not MSDOS */
1584 /* Maybe use ../etc as well as ../lib-src. */
1587 tem
= Fexpand_file_name (build_string ("etc"),
1588 Vinstallation_directory
);
1589 Vdoc_directory
= Ffile_name_as_directory (tem
);
1593 /* Look for the files that should be in etc. We don't use
1594 Vinstallation_directory, because these files are never installed
1595 near the executable, and they are never in the build
1596 directory when that's different from the source directory.
1598 Instead, if these files are not in the nominal place, we try the
1599 source directory. */
1602 Lisp_Object tem
, tem1
, srcdir
;
1603 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1605 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1607 tem
= Fexpand_file_name (build_string ("NEWS"), Vdata_directory
);
1608 tem1
= Ffile_exists_p (tem
);
1609 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1612 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1613 tem
= Fexpand_file_name (build_string ("NEWS"), newdir
);
1614 tem1
= Ffile_exists_p (tem
);
1616 Vdata_directory
= newdir
;
1624 tempdir
= Fdirectory_file_name (Vexec_directory
);
1625 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1626 dir_warning ("arch-dependent data dir", Vexec_directory
);
1629 tempdir
= Fdirectory_file_name (Vdata_directory
);
1630 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1631 dir_warning ("arch-independent data dir", Vdata_directory
);
1633 sh
= getenv ("SHELL");
1634 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1637 Vshared_game_score_directory
= Qnil
;
1639 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1640 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1641 Vshared_game_score_directory
= Qnil
;
1646 set_initial_environment (void)
1649 for (envp
= environ
; *envp
; envp
++)
1650 Vprocess_environment
= Fcons (build_string (*envp
),
1651 Vprocess_environment
);
1652 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1653 to use `delete' and friends on process-environment. */
1654 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1658 syms_of_callproc (void)
1661 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1663 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1665 staticpro (&Vtemp_file_name_pattern
);
1668 synch_process_tempfile
= make_number (0);
1669 staticpro (&synch_process_tempfile
);
1672 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1673 doc
: /* File name to load inferior shells from.
1674 Initialized from the SHELL environment variable, or to a system-dependent
1675 default if SHELL is not set. */);
1677 DEFVAR_LISP ("exec-path", Vexec_path
,
1678 doc
: /* List of directories to search programs to run in subprocesses.
1679 Each element is a string (directory name) or nil (try default directory).
1681 By default the last element of this list is `exec-directory'. The
1682 last element is not always used, for example in shell completion
1683 (`shell-dynamic-complete-command'). */);
1685 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1686 doc
: /* List of suffixes to try to find executable file names.
1687 Each element is a string. */);
1688 Vexec_suffixes
= Qnil
;
1690 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1691 doc
: /* Directory for executables for Emacs to invoke.
1692 More generally, this includes any architecture-dependent files
1693 that are built and installed from the Emacs distribution. */);
1695 DEFVAR_LISP ("data-directory", Vdata_directory
,
1696 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1697 These are files intended for Emacs to use while it runs. */);
1699 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1700 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1701 This is usually the same as `data-directory'. */);
1703 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1704 doc
: /* For internal use by the build procedure only.
1705 This is the name of the directory in which the build procedure installed
1706 Emacs's info files; the default value for `Info-default-directory-list'
1708 Vconfigure_info_directory
= build_string (PATH_INFO
);
1710 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1711 doc
: /* Directory of score files for games which come with GNU Emacs.
1712 If this variable is nil, then Emacs is unable to use a shared directory. */);
1714 Vshared_game_score_directory
= Qnil
;
1716 Vshared_game_score_directory
= build_string (PATH_GAME
);
1719 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1720 doc
: /* List of environment variables inherited from the parent process.
1721 Each element should be a string of the form ENVVARNAME=VALUE.
1722 The elements must normally be decoded (using `locale-coding-system') for use. */);
1723 Vinitial_environment
= Qnil
;
1725 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1726 doc
: /* List of overridden environment variables for subprocesses to inherit.
1727 Each element should be a string of the form ENVVARNAME=VALUE.
1729 Entries in this list take precedence to those in the frame-local
1730 environments. Therefore, let-binding `process-environment' is an easy
1731 way to temporarily change the value of an environment variable,
1732 irrespective of where it comes from. To use `process-environment' to
1733 remove an environment variable, include only its name in the list,
1736 This variable is set to nil when Emacs starts.
1738 If multiple entries define the same variable, the first one always
1741 Non-ASCII characters are encoded according to the initial value of
1742 `locale-coding-system', i.e. the elements must normally be decoded for
1745 See `setenv' and `getenv'. */);
1746 Vprocess_environment
= Qnil
;
1748 defsubr (&Scall_process
);
1749 defsubr (&Sgetenv_internal
);
1750 defsubr (&Scall_process_region
);