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);
111 block_child_signal (void)
114 sigemptyset (&blocked
);
115 sigaddset (&blocked
, SIGCHLD
);
116 pthread_sigmask (SIG_BLOCK
, &blocked
, 0);
119 /* Unblock SIGCHLD. */
122 unblock_child_signal (void)
124 pthread_sigmask (SIG_SETMASK
, &empty_mask
, 0);
127 /* Return the current buffer's working directory, or the home
128 directory if it's unreachable, as a string suitable for a system call.
129 Signal an error if the result would not be an accessible directory. */
132 encode_current_directory (void)
137 dir
= BVAR (current_buffer
, directory
);
140 dir
= Funhandled_file_name_directory (dir
);
142 /* If the file name handler says that dir is unreachable, use
143 a sensible default. */
145 dir
= build_string ("~");
147 dir
= expand_and_dir_to_file (dir
, Qnil
);
149 if (STRING_MULTIBYTE (dir
))
150 dir
= ENCODE_FILE (dir
);
151 if (! file_accessible_directory_p (SSDATA (dir
)))
152 report_file_error ("Setting current directory",
153 BVAR (current_buffer
, directory
));
155 RETURN_UNGCPRO (dir
);
158 /* If P is reapable, record it as a deleted process and kill it.
159 Do this in a critical section. Unless PID is wedged it will be
160 reaped on receipt of the first SIGCHLD after the critical section. */
163 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
165 block_child_signal ();
169 record_deleted_pid (p
->pid
, tempfile
);
171 kill (- p
->pid
, SIGKILL
);
174 unblock_child_signal ();
177 /* Clean up files, file descriptors and processes created by Fcall_process. */
180 delete_temp_file (Lisp_Object name
)
182 unlink (SSDATA (name
));
186 call_process_kill (void *ptr
)
188 int *callproc_fd
= ptr
;
190 for (i
= 0; i
< CALLPROC_FDS
; i
++)
191 if (0 <= callproc_fd
[i
])
192 emacs_close (callproc_fd
[i
]);
194 if (synch_process_pid
)
196 struct Lisp_Process proc
;
198 proc
.pid
= synch_process_pid
;
199 record_kill_process (&proc
, synch_process_tempfile
);
200 synch_process_pid
= 0;
202 else if (STRINGP (synch_process_tempfile
))
203 delete_temp_file (synch_process_tempfile
);
206 /* Clean up when exiting Fcall_process: restore the buffer, and
207 kill the subsidiary process group if the process still exists. */
210 call_process_cleanup (Lisp_Object buffer
)
212 Fset_buffer (buffer
);
214 if (synch_process_pid
)
216 kill (-synch_process_pid
, SIGINT
);
217 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
220 wait_for_termination (synch_process_pid
, 0, 1);
221 synch_process_pid
= 0;
223 message1 ("Waiting for process to die...done");
228 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
230 static mode_t
const default_output_mode
= 0666;
233 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
234 doc
: /* Call PROGRAM synchronously in separate process.
235 The remaining arguments are optional.
236 The program's input comes from file INFILE (nil means `/dev/null').
237 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
238 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
239 FILE is a file name string, means that it should be written to that file
240 \(if the file already exists it is overwritten).
241 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
242 REAL-BUFFER says what to do with standard output, as above,
243 while STDERR-FILE says what to do with standard error in the child.
244 STDERR-FILE may be nil (discard standard error output),
245 t (mix it with ordinary output), or a file name string.
247 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
248 Remaining arguments are strings passed as command arguments to PROGRAM.
250 If executable PROGRAM can't be found as an executable, `call-process'
251 signals a Lisp error. `call-process' reports errors in execution of
252 the program only through its return and output.
254 If DESTINATION is 0, `call-process' returns immediately with value nil.
255 Otherwise it waits for PROGRAM to terminate
256 and returns a numeric exit status or a signal description string.
257 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
259 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
260 (ptrdiff_t nargs
, Lisp_Object
*args
)
262 Lisp_Object infile
, encoded_infile
;
265 ptrdiff_t count
= SPECPDL_INDEX ();
267 if (nargs
>= 2 && ! NILP (args
[1]))
269 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
270 CHECK_STRING (infile
);
273 infile
= build_string (NULL_DEVICE
);
276 encoded_infile
= STRING_MULTIBYTE (infile
) ? ENCODE_FILE (infile
) : infile
;
278 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
280 report_file_error ("Opening process input file", infile
);
281 record_unwind_protect_int (close_file_unwind
, filefd
);
283 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
286 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
288 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
289 unwinder that is intended to remove the input temporary file; in
290 this case NARGS must be at least 2 and ARGS[1] is the file's name.
292 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
295 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
296 ptrdiff_t tempfile_index
)
298 Lisp_Object buffer
, current_dir
, path
;
301 int callproc_fd
[CALLPROC_FDS
];
304 ptrdiff_t count
= SPECPDL_INDEX ();
308 /* File to use for stderr in the child.
309 t means use same as standard output. */
310 Lisp_Object error_file
;
311 Lisp_Object output_file
= Qnil
;
312 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
313 char *tempfile
= NULL
;
319 int fd_output
, fd_error
;
320 struct coding_system process_coding
; /* coding-system of process output */
321 struct coding_system argument_coding
; /* coding-system of arguments */
322 /* Set to the return value of Ffind_operation_coding_system. */
323 Lisp_Object coding_systems
;
326 if (synch_process_pid
)
327 error ("call-process invoked recursively");
329 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
332 CHECK_STRING (args
[0]);
337 /* Without asynchronous processes we cannot have BUFFER == 0. */
339 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
340 error ("Operating system cannot handle asynchronous subprocesses");
341 #endif /* subprocesses */
343 /* Decide the coding-system for giving arguments. */
345 Lisp_Object val
, *args2
;
347 /* If arguments are supplied, we may have to encode them. */
350 bool must_encode
= 0;
351 Lisp_Object coding_attrs
;
353 for (i
= 4; i
< nargs
; i
++)
354 CHECK_STRING (args
[i
]);
356 for (i
= 4; i
< nargs
; i
++)
357 if (STRING_MULTIBYTE (args
[i
]))
360 if (!NILP (Vcoding_system_for_write
))
361 val
= Vcoding_system_for_write
;
362 else if (! must_encode
)
366 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
367 args2
[0] = Qcall_process
;
368 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
369 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
370 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
372 val
= complement_process_encoding_system (val
);
373 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
374 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
375 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
377 /* We should not use an ASCII incompatible coding system. */
378 val
= raw_text_coding_system (val
);
379 setup_coding_system (val
, &argument_coding
);
390 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
391 FILE-FOR-STDERR), unless the first element is :file, in which case see
392 the next paragraph. */
393 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
395 if (CONSP (XCDR (buffer
)))
397 Lisp_Object stderr_file
;
398 stderr_file
= XCAR (XCDR (buffer
));
400 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
401 error_file
= stderr_file
;
403 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
406 buffer
= XCAR (buffer
);
409 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
410 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
412 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
413 BVAR (current_buffer
, directory
));
414 CHECK_STRING (output_file
);
418 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
420 Lisp_Object spec_buffer
;
421 spec_buffer
= buffer
;
422 buffer
= Fget_buffer_create (buffer
);
423 /* Mention the buffer name for a better error message. */
425 CHECK_BUFFER (spec_buffer
);
426 CHECK_BUFFER (buffer
);
430 /* Make sure that the child will be able to chdir to the current
431 buffer's current directory, or its unhandled equivalent. We
432 can't just have the child check for an error when it does the
433 chdir, since it's in a vfork.
435 We have to GCPRO around this because Fexpand_file_name,
436 Funhandled_file_name_directory, and Ffile_accessible_directory_p
437 might call a file name handling function. The argument list is
438 protected by the caller, so all we really have to worry about is
441 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
443 current_dir
= encode_current_directory ();
445 GCPRO4 (buffer
, current_dir
, error_file
, output_file
);
447 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
448 error_file
= ENCODE_FILE (error_file
);
449 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
450 output_file
= ENCODE_FILE (output_file
);
454 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
456 for (i
= 0; i
< CALLPROC_FDS
; i
++)
459 synch_process_tempfile
= make_number (0);
461 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
463 /* Search for program; barf if not found. */
465 struct gcpro gcpro1
, gcpro2
, gcpro3
;
468 GCPRO3 (buffer
, current_dir
, error_file
);
469 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
,
470 make_number (X_OK
), false);
473 report_file_error ("Searching for program", args
[0]);
476 /* If program file name starts with /: for quoting a magic name,
478 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
479 && SREF (path
, 1) == ':')
480 path
= Fsubstring (path
, make_number (2), Qnil
);
482 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
485 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
487 GCPRO4 (buffer
, current_dir
, path
, error_file
);
492 argument_coding
.dst_multibyte
= 0;
493 for (i
= 4; i
< nargs
; i
++)
495 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
496 if (CODING_REQUIRE_ENCODING (&argument_coding
))
497 /* We must encode this argument. */
498 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
500 for (i
= 4; i
< nargs
; i
++)
501 new_argv
[i
- 3] = SSDATA (args
[i
]);
506 if (STRING_MULTIBYTE (path
))
507 path
= ENCODE_FILE (path
);
508 new_argv
[0] = SSDATA (path
);
512 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
515 if (! discard_output
&& ! STRINGP (output_file
))
517 char const *tmpdir
= egetenv ("TMPDIR");
518 char const *outf
= tmpdir
? tmpdir
: "";
519 tempfile
= alloca (strlen (outf
) + 20);
520 strcpy (tempfile
, outf
);
521 dostounix_filename (tempfile
, 0);
522 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
523 strcat (tempfile
, "/");
524 strcat (tempfile
, "detmp.XXX");
527 report_file_error ("Opening process output file", Qnil
);
528 output_file
= build_string (tempfile
);
529 synch_process_tempfile
= output_file
;
535 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
537 report_file_error ("Opening null device", Qnil
);
539 else if (STRINGP (output_file
))
541 fd_output
= emacs_open (SSDATA (output_file
),
542 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
543 default_output_mode
);
546 int open_errno
= errno
;
547 output_file
= DECODE_FILE (output_file
);
548 report_file_errno ("Opening process output file",
549 output_file
, open_errno
);
555 if (emacs_pipe (fd
) != 0)
556 report_file_error ("Creating process pipe", Qnil
);
557 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
560 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
562 fd_error
= fd_output
;
564 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
566 fd_error
= emacs_open ((STRINGP (error_file
)
567 ? SSDATA (error_file
)
569 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
570 default_output_mode
);
573 int open_errno
= errno
;
574 report_file_errno ("Cannot redirect stderr",
575 (STRINGP (error_file
)
576 ? DECODE_FILE (error_file
)
577 : build_string (NULL_DEVICE
)),
580 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
583 #ifdef MSDOS /* MW, July 1993 */
584 /* Note that on MSDOS `child_setup' actually returns the child process
585 exit status, not its PID, so assign it to status below. */
586 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
591 unbind_to (count
, Qnil
);
592 synchronize_system_messages_locale ();
594 code_convert_string_norecord (build_string (strerror (child_errno
)),
595 Vlocale_coding_system
, 0);
599 for (i
= 0; i
< CALLPROC_FDS
; i
++)
600 if (0 <= callproc_fd
[i
])
602 emacs_close (callproc_fd
[i
]);
605 emacs_close (filefd
);
606 clear_unwind_protect (count
- 1);
610 /* Since CRLF is converted to LF within `decode_coding', we
611 can always open a file with binary mode. */
612 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
613 O_RDONLY
| O_BINARY
, 0);
614 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
616 int open_errno
= errno
;
617 report_file_errno ("Cannot re-open temporary file",
618 build_string (tempfile
), open_errno
);
624 /* Do the unwind-protect now, even though the pid is not known, so
625 that no storage allocation is done in the critical section.
626 The actual PID will be filled in during the critical section. */
627 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
632 block_child_signal ();
635 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
636 #else /* not WINDOWSNT */
638 /* vfork, and prevent local vars from being clobbered by the vfork. */
640 Lisp_Object
volatile buffer_volatile
= buffer
;
641 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
642 Lisp_Object
volatile current_dir_volatile
= current_dir
;
643 bool volatile display_p_volatile
= display_p
;
644 bool volatile sa_must_free_volatile
= sa_must_free
;
645 int volatile fd_error_volatile
= fd_error
;
646 int volatile filefd_volatile
= filefd
;
647 ptrdiff_t volatile count_volatile
= count
;
648 ptrdiff_t volatile sa_count_volatile
= sa_count
;
649 char **volatile new_argv_volatile
= new_argv
;
650 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
651 for (i
= 0; i
< CALLPROC_FDS
; i
++)
652 callproc_fd_volatile
[i
] = callproc_fd
[i
];
656 buffer
= buffer_volatile
;
657 coding_systems
= coding_systems_volatile
;
658 current_dir
= current_dir_volatile
;
659 display_p
= display_p_volatile
;
660 sa_must_free
= sa_must_free_volatile
;
661 fd_error
= fd_error_volatile
;
662 filefd
= filefd_volatile
;
663 count
= count_volatile
;
664 sa_count
= sa_count_volatile
;
665 new_argv
= new_argv_volatile
;
667 for (i
= 0; i
< CALLPROC_FDS
; i
++)
668 callproc_fd
[i
] = callproc_fd_volatile
[i
];
669 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
674 unblock_child_signal ();
678 /* Emacs ignores SIGPIPE, but the child should not. */
679 signal (SIGPIPE
, SIG_DFL
);
681 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
684 #endif /* not WINDOWSNT */
690 synch_process_pid
= pid
;
692 if (INTEGERP (buffer
))
694 if (tempfile_index
< 0)
695 record_deleted_pid (pid
, Qnil
);
699 record_deleted_pid (pid
, args
[1]);
700 clear_unwind_protect (tempfile_index
);
702 synch_process_pid
= 0;
706 unblock_child_signal ();
709 #endif /* not MSDOS */
712 report_file_errno ("Doing vfork", Qnil
, child_errno
);
714 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
715 since we will use that to read input from. */
716 for (i
= 0; i
< CALLPROC_FDS
; i
++)
717 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
719 emacs_close (callproc_fd
[i
]);
722 emacs_close (filefd
);
723 clear_unwind_protect (count
- 1);
725 if (INTEGERP (buffer
))
726 return unbind_to (count
, Qnil
);
728 if (BUFFERP (buffer
))
729 Fset_buffer (buffer
);
731 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
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
));
769 process_coding
.src_multibyte
= 0;
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
;
782 EMACS_INT total_read
= 0;
784 bool display_on_the_fly
= display_p
;
785 struct coding_system saved_coding
= process_coding
;
789 /* Repeatedly read until we've filled as much as possible
790 of the buffer size we have. But don't read
791 less than 1024--save that for the next bufferful. */
793 while (nread
< bufsize
- 1024)
795 int this_read
= emacs_read (fd0
, buf
+ nread
,
803 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
808 total_read
+= this_read
;
810 if (display_on_the_fly
)
814 /* 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 prepare_to_modify_buffer (PT
, PT
, NULL
);
827 /* We cannot allow after-change-functions be run
828 during decoding, because that might modify the
829 buffer, while we rely on process_coding.produced to
830 faithfully reflect inserted text until we
831 TEMP_SET_PT_BOTH below. */
832 specbind (Qinhibit_modification_hooks
, Qt
);
833 decode_coding_c_string (&process_coding
,
834 (unsigned char *) buf
, nread
, curbuf
);
835 unbind_to (count1
, Qnil
);
836 if (display_on_the_fly
837 && CODING_REQUIRE_DETECTION (&saved_coding
)
838 && ! CODING_REQUIRE_DETECTION (&process_coding
))
840 /* We have detected some coding system, but the
841 detection may have been via insufficient data.
842 So give up 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
),
851 display_on_the_fly
= 0;
852 process_coding
= saved_coding
;
854 /* Make the above condition always fail 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
);
868 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
871 /* Make the buffer bigger as we continue to read more data,
872 but not past CALLPROC_BUFFER_SIZE_MAX. */
873 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
874 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
875 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
879 redisplay_preserve_echo_area (1);
880 /* This variable might have been set to 0 for code
881 detection. In that case, set it back to 1 because
882 we should have already detected a coding system. */
883 display_on_the_fly
= 1;
890 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
891 /* If the caller required, let the buffer inherit the
892 coding-system used to decode the process output. */
893 if (inherit_process_coding_system
)
894 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
895 make_number (total_read
));
899 /* Wait for it to terminate, unless it already has. */
900 wait_for_termination (pid
, &status
, fd0
< 0);
905 /* Don't kill any children that the subprocess may have left behind
907 synch_process_pid
= 0;
910 unbind_to (count
, Qnil
);
912 if (WIFSIGNALED (status
))
916 synchronize_system_messages_locale ();
917 signame
= strsignal (WTERMSIG (status
));
922 return code_convert_string_norecord (build_string (signame
),
923 Vlocale_coding_system
, 0);
926 eassert (WIFEXITED (status
));
927 return make_number (WEXITSTATUS (status
));
930 /* Create a temporary file suitable for storing the input data of
931 call-process-region. NARGS and ARGS are the same as for
932 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
933 naming the file, and return a file descriptor for reading.
934 Unwind-protect the file, so that the file descriptor will be closed
935 and the file removed when the caller unwinds the specpdl stack. */
938 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
939 Lisp_Object
*filename_string_ptr
)
943 Lisp_Object filename_string
;
944 Lisp_Object val
, start
, end
;
947 if (STRINGP (Vtemporary_file_directory
))
948 tmpdir
= Vtemporary_file_directory
;
953 outf
= getenv ("TMPDIR");
954 tmpdir
= build_string (outf
? outf
: "/tmp/");
956 if ((outf
= egetenv ("TMPDIR"))
957 || (outf
= egetenv ("TMP"))
958 || (outf
= egetenv ("TEMP")))
959 tmpdir
= build_string (outf
);
961 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
966 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
971 /* Cannot use the result of Fexpand_file_name, because it
972 downcases the XXXXXX part of the pattern, and mktemp then
973 doesn't recognize it. */
974 if (!NILP (Vw32_downcase_file_names
))
976 Lisp_Object dirname
= Ffile_name_directory (pattern
);
979 pattern
= Vtemp_file_name_pattern
;
981 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
985 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
986 GCPRO1 (filename_string
);
987 tempfile
= SSDATA (filename_string
);
989 count
= SPECPDL_INDEX ();
990 record_unwind_protect_nothing ();
991 fd
= mkostemp (tempfile
, O_CLOEXEC
);
993 report_file_error ("Failed to open temporary file using pattern",
995 set_unwind_protect (count
, delete_temp_file
, filename_string
);
996 record_unwind_protect_int (close_file_unwind
, fd
);
1001 /* Decide coding-system of the contents of the temporary file. */
1002 if (!NILP (Vcoding_system_for_write
))
1003 val
= Vcoding_system_for_write
;
1004 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1008 Lisp_Object coding_systems
;
1011 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1012 args2
[0] = Qcall_process_region
;
1013 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1014 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1015 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1018 val
= complement_process_encoding_system (val
);
1021 ptrdiff_t count1
= SPECPDL_INDEX ();
1023 specbind (intern ("coding-system-for-write"), val
);
1024 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1025 happen to get a ".Z" suffix. */
1026 specbind (intern ("file-name-handler-alist"), Qnil
);
1027 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1029 unbind_to (count1
, Qnil
);
1032 if (lseek (fd
, 0, SEEK_SET
) < 0)
1033 report_file_error ("Setting file position", filename_string
);
1035 /* Note that Fcall_process takes care of binding
1036 coding-system-for-read. */
1038 *filename_string_ptr
= filename_string
;
1043 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1045 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1046 The remaining arguments are optional.
1047 Delete the text if fourth arg DELETE is non-nil.
1049 Insert output in BUFFER before point; t means current buffer; nil for
1050 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1051 FILE)', where FILE is a file name string, means that it should be
1052 written to that file (if the file already exists it is overwritten).
1053 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1054 REAL-BUFFER says what to do with standard output, as above,
1055 while STDERR-FILE says what to do with standard error in the child.
1056 STDERR-FILE may be nil (discard standard error output),
1057 t (mix it with ordinary output), or a file name string.
1059 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1060 Remaining args are passed to PROGRAM at startup as command args.
1062 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1063 Otherwise it waits for PROGRAM to terminate
1064 and returns a numeric exit status or a signal description string.
1065 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1067 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1068 (ptrdiff_t nargs
, Lisp_Object
*args
)
1070 struct gcpro gcpro1
;
1071 Lisp_Object infile
, val
;
1072 ptrdiff_t count
= SPECPDL_INDEX ();
1073 Lisp_Object start
= args
[0];
1074 Lisp_Object end
= args
[1];
1078 if (STRINGP (start
))
1079 empty_input
= SCHARS (start
) == 0;
1080 else if (NILP (start
))
1081 empty_input
= BEG
== Z
;
1084 validate_region (&args
[0], &args
[1]);
1087 empty_input
= XINT (start
) == XINT (end
);
1091 fd
= create_temp_file (nargs
, args
, &infile
);
1095 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1097 report_file_error ("Opening null device", Qnil
);
1098 record_unwind_protect_int (close_file_unwind
, fd
);
1103 if (nargs
> 3 && !NILP (args
[3]))
1104 Fdelete_region (start
, end
);
1118 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1119 RETURN_UNGCPRO (unbind_to (count
, val
));
1123 static int relocate_fd (int fd
, int minfd
);
1127 add_env (char **env
, char **new_env
, char *string
)
1134 /* See if this string duplicates any string already in the env.
1135 If so, don't put it in.
1136 When an env var has multiple definitions,
1137 we keep the definition that comes first in process-environment. */
1138 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1140 char *p
= *ep
, *q
= string
;
1146 /* The string is a lone variable name; keep it for now, we
1147 will remove it later. It is a placeholder for a
1148 variable that is not to be included in the environment. */
1156 *new_env
++ = string
;
1160 /* This is the last thing run in a newly forked inferior
1161 either synchronous or asynchronous.
1162 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1163 Initialize inferior's priority, pgrp, connected dir and environment.
1164 then exec another program based on new_argv.
1166 If SET_PGRP, put the subprocess into a separate process group.
1168 CURRENT_DIR is an elisp string giving the path of the current
1169 directory the subprocess should have. Since we can't really signal
1170 a decent error from within the child, this should be verified as an
1171 executable directory by the parent. */
1174 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1175 Lisp_Object current_dir
)
1185 pid_t pid
= getpid ();
1186 #endif /* WINDOWSNT */
1188 /* Note that use of alloca is always safe here. It's obvious for systems
1189 that do not have true vfork or that have true (stack) alloca.
1190 If using vfork and C_ALLOCA (when Emacs used to include
1191 src/alloca.c) it is safe because that changes the superior's
1192 static variables as if the superior had done alloca and will be
1193 cleaned up in the usual way. */
1198 i
= SBYTES (current_dir
);
1200 /* MSDOS must have all environment variables malloc'ed, because
1201 low-level libc functions that launch subsidiary processes rely
1203 pwd_var
= xmalloc (i
+ 5);
1205 pwd_var
= alloca (i
+ 5);
1208 memcpy (pwd_var
, "PWD=", 4);
1209 strcpy (temp
, SSDATA (current_dir
));
1212 /* We can't signal an Elisp error here; we're in a vfork. Since
1213 the callers check the current directory before forking, this
1214 should only return an error if the directory's permissions
1215 are changed between the check and this chdir, but we should
1217 if (chdir (temp
) < 0)
1218 _exit (EXIT_CANCELED
);
1220 /* Get past the drive letter, so that d:/ is left alone. */
1221 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1228 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1229 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1233 /* Set `env' to a vector of the strings in the environment. */
1235 register Lisp_Object tem
;
1236 register char **new_env
;
1238 register int new_length
;
1239 Lisp_Object display
= Qnil
;
1243 for (tem
= Vprocess_environment
;
1244 CONSP (tem
) && STRINGP (XCAR (tem
));
1247 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1248 && (SDATA (XCAR (tem
)) [7] == '\0'
1249 || SDATA (XCAR (tem
)) [7] == '='))
1250 /* DISPLAY is specified in process-environment. */
1255 /* If not provided yet, use the frame's DISPLAY. */
1258 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1259 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1260 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1261 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1262 Vinitial_environment
);
1270 /* new_length + 2 to include PWD and terminating 0. */
1271 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1272 /* If we have a PWD envvar, pass one down,
1273 but with corrected value. */
1274 if (egetenv ("PWD"))
1275 *new_env
++ = pwd_var
;
1277 if (STRINGP (display
))
1279 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1280 strcpy (vdata
, "DISPLAY=");
1281 strcat (vdata
, SSDATA (display
));
1282 new_env
= add_env (env
, new_env
, vdata
);
1286 for (tem
= Vprocess_environment
;
1287 CONSP (tem
) && STRINGP (XCAR (tem
));
1289 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1293 /* Remove variable names without values. */
1297 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1307 prepare_standard_handles (in
, out
, err
, handles
);
1308 set_process_dir (SDATA (current_dir
));
1309 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1310 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1311 reset_standard_handles (in
, out
, err
, handles
);
1313 /* An error occurred while trying to spawn the process. */
1314 report_file_error ("Spawning child process", Qnil
);
1317 #else /* not WINDOWSNT */
1318 /* Make sure that in, out, and err are not actually already in
1319 descriptors zero, one, or two; this could happen if Emacs is
1320 started with its standard in, out, or error closed, as might
1323 int oin
= in
, oout
= out
;
1325 /* We have to avoid relocating the same descriptor twice! */
1327 in
= relocate_fd (in
, 3);
1332 out
= relocate_fd (out
, 3);
1336 else if (err
== oout
)
1339 err
= relocate_fd (err
, 3);
1343 /* Redirect file descriptors and clear the close-on-exec flag on the
1344 redirected ones. IN, OUT, and ERR are close-on-exec so they
1345 need not be closed explicitly. */
1353 execve (new_argv
[0], new_argv
, env
);
1356 /* Avoid deadlock if the child's perror writes to a full pipe; the
1357 pipe's reader is the parent, but with vfork the parent can't
1358 run until the child exits. Truncate the diagnostic instead. */
1359 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1362 emacs_perror (new_argv
[0]);
1363 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1366 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1369 /* An error occurred while trying to run the subprocess. */
1370 report_file_error ("Spawning child process", Qnil
);
1373 #endif /* not WINDOWSNT */
1377 /* Move the file descriptor FD so that its number is not less than MINFD.
1378 If the file descriptor is moved at all, the original is closed on MSDOS,
1379 but not elsewhere as the caller will close it anyway. */
1381 relocate_fd (int fd
, int minfd
)
1387 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1390 emacs_perror ("while setting up child");
1391 _exit (EXIT_CANCELED
);
1399 #endif /* not WINDOWSNT */
1402 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1403 ptrdiff_t *valuelen
, Lisp_Object env
)
1405 for (; CONSP (env
); env
= XCDR (env
))
1407 Lisp_Object entry
= XCAR (env
);
1409 && SBYTES (entry
) >= varlen
1411 /* NT environment variables are case insensitive. */
1412 && ! strnicmp (SDATA (entry
), var
, varlen
)
1413 #else /* not WINDOWSNT */
1414 && ! memcmp (SDATA (entry
), var
, varlen
)
1415 #endif /* not WINDOWSNT */
1418 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1420 *value
= SSDATA (entry
) + (varlen
+ 1);
1421 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1424 else if (SBYTES (entry
) == varlen
)
1426 /* Lone variable names in Vprocess_environment mean that
1427 variable should be removed from the environment. */
1437 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1438 ptrdiff_t *valuelen
, Lisp_Object frame
)
1440 /* Try to find VAR in Vprocess_environment first. */
1441 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1442 Vprocess_environment
))
1443 return *value
? 1 : 0;
1445 /* For DISPLAY try to get the values from the frame or the initial env. */
1446 if (strcmp (var
, "DISPLAY") == 0)
1449 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1450 if (STRINGP (display
))
1452 *value
= SSDATA (display
);
1453 *valuelen
= SBYTES (display
);
1456 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1457 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1458 Vinitial_environment
))
1459 return *value
? 1 : 0;
1465 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1466 doc
: /* Get the value of environment variable VARIABLE.
1467 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1468 the environment. Otherwise, value is a string.
1470 This function searches `process-environment' for VARIABLE.
1472 If optional parameter ENV is a list, then search this list instead of
1473 `process-environment', and return t when encountering a negative entry
1474 \(an entry for a variable with no value). */)
1475 (Lisp_Object variable
, Lisp_Object env
)
1480 CHECK_STRING (variable
);
1483 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1484 &value
, &valuelen
, env
))
1485 return value
? make_string (value
, valuelen
) : Qt
;
1489 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1490 &value
, &valuelen
, env
))
1491 return make_string (value
, valuelen
);
1496 /* A version of getenv that consults the Lisp environment lists,
1497 easily callable from C. */
1499 egetenv (const char *var
)
1504 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1511 /* This is run before init_cmdargs. */
1514 init_callproc_1 (void)
1517 const char *etc_dir
= ns_etc_directory ();
1518 const char *path_exec
= ns_exec_path ();
1521 Vdata_directory
= decode_env_path ("EMACSDATA",
1526 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1528 Vdoc_directory
= decode_env_path ("EMACSDOC",
1533 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1535 /* Check the EMACSPATH environment variable, defaulting to the
1536 PATH_EXEC path from epaths.h. */
1537 Vexec_path
= decode_env_path ("EMACSPATH",
1539 path_exec
? path_exec
:
1542 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1543 /* FIXME? For ns, path_exec should go at the front? */
1544 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1547 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1550 init_callproc (void)
1552 char *data_dir
= egetenv ("EMACSDATA");
1555 Lisp_Object tempdir
;
1559 const char *etc_dir
= ns_etc_directory ();
1562 data_dir
= alloca (strlen (etc_dir
) + 1);
1563 strcpy (data_dir
, etc_dir
);
1568 if (!NILP (Vinstallation_directory
))
1570 /* Add to the path the lib-src subdir of the installation dir. */
1572 tem
= Fexpand_file_name (build_string ("lib-src"),
1573 Vinstallation_directory
);
1575 /* MSDOS uses wrapped binaries, so don't do this. */
1576 if (NILP (Fmember (tem
, Vexec_path
)))
1579 const char *path_exec
= ns_exec_path ();
1581 Vexec_path
= decode_env_path ("EMACSPATH",
1583 path_exec
? path_exec
:
1586 Vexec_path
= Fcons (tem
, Vexec_path
);
1587 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1590 Vexec_directory
= Ffile_name_as_directory (tem
);
1591 #endif /* not MSDOS */
1593 /* Maybe use ../etc as well as ../lib-src. */
1596 tem
= Fexpand_file_name (build_string ("etc"),
1597 Vinstallation_directory
);
1598 Vdoc_directory
= Ffile_name_as_directory (tem
);
1602 /* Look for the files that should be in etc. We don't use
1603 Vinstallation_directory, because these files are never installed
1604 near the executable, and they are never in the build
1605 directory when that's different from the source directory.
1607 Instead, if these files are not in the nominal place, we try the
1608 source directory. */
1611 Lisp_Object tem
, tem1
, srcdir
;
1612 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1614 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1616 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1617 tem1
= Ffile_exists_p (tem
);
1618 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1621 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1622 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1623 tem1
= Ffile_exists_p (tem
);
1625 Vdata_directory
= newdir
;
1633 tempdir
= Fdirectory_file_name (Vexec_directory
);
1634 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1635 dir_warning ("arch-dependent data dir", Vexec_directory
);
1638 tempdir
= Fdirectory_file_name (Vdata_directory
);
1639 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1640 dir_warning ("arch-independent data dir", Vdata_directory
);
1642 sh
= getenv ("SHELL");
1643 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1646 Vshared_game_score_directory
= Qnil
;
1648 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1649 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1650 Vshared_game_score_directory
= Qnil
;
1655 set_initial_environment (void)
1658 for (envp
= environ
; *envp
; envp
++)
1659 Vprocess_environment
= Fcons (build_string (*envp
),
1660 Vprocess_environment
);
1661 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1662 to use `delete' and friends on process-environment. */
1663 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1667 syms_of_callproc (void)
1670 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1671 #elif defined (WINDOWSNT)
1672 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1674 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1676 staticpro (&Vtemp_file_name_pattern
);
1679 synch_process_tempfile
= make_number (0);
1680 staticpro (&synch_process_tempfile
);
1683 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1684 doc
: /* File name to load inferior shells from.
1685 Initialized from the SHELL environment variable, or to a system-dependent
1686 default if SHELL is not set. */);
1688 DEFVAR_LISP ("exec-path", Vexec_path
,
1689 doc
: /* List of directories to search programs to run in subprocesses.
1690 Each element is a string (directory name) or nil (try default directory).
1692 By default the last element of this list is `exec-directory'. The
1693 last element is not always used, for example in shell completion
1694 (`shell-dynamic-complete-command'). */);
1696 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1697 doc
: /* List of suffixes to try to find executable file names.
1698 Each element is a string. */);
1699 Vexec_suffixes
= Qnil
;
1701 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1702 doc
: /* Directory for executables for Emacs to invoke.
1703 More generally, this includes any architecture-dependent files
1704 that are built and installed from the Emacs distribution. */);
1706 DEFVAR_LISP ("data-directory", Vdata_directory
,
1707 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1708 These are files intended for Emacs to use while it runs. */);
1710 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1711 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1712 This is usually the same as `data-directory'. */);
1714 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1715 doc
: /* For internal use by the build procedure only.
1716 This is the name of the directory in which the build procedure installed
1717 Emacs's info files; the default value for `Info-default-directory-list'
1719 Vconfigure_info_directory
= build_string (PATH_INFO
);
1721 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1722 doc
: /* Directory of score files for games which come with GNU Emacs.
1723 If this variable is nil, then Emacs is unable to use a shared directory. */);
1725 Vshared_game_score_directory
= Qnil
;
1727 Vshared_game_score_directory
= build_string (PATH_GAME
);
1730 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1731 doc
: /* List of environment variables inherited from the parent process.
1732 Each element should be a string of the form ENVVARNAME=VALUE.
1733 The elements must normally be decoded (using `locale-coding-system') for use. */);
1734 Vinitial_environment
= Qnil
;
1736 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1737 doc
: /* List of overridden environment variables for subprocesses to inherit.
1738 Each element should be a string of the form ENVVARNAME=VALUE.
1740 Entries in this list take precedence to those in the frame-local
1741 environments. Therefore, let-binding `process-environment' is an easy
1742 way to temporarily change the value of an environment variable,
1743 irrespective of where it comes from. To use `process-environment' to
1744 remove an environment variable, include only its name in the list,
1747 This variable is set to nil when Emacs starts.
1749 If multiple entries define the same variable, the first one always
1752 Non-ASCII characters are encoded according to the initial value of
1753 `locale-coding-system', i.e. the elements must normally be decoded for
1756 See `setenv' and `getenv'. */);
1757 Vprocess_environment
= Qnil
;
1759 defsubr (&Scall_process
);
1760 defsubr (&Sgetenv_internal
);
1761 defsubr (&Scall_process_region
);