1 /* Synchronous subprocess invocation for GNU Emacs.
3 Copyright (C) 1985-1988, 1993-1995, 1999-2013 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 used while record-unwind-protect is in place
72 during call-process for a subprocess for which record_deleted_pid has
73 not yet been called. At other times, synch_process_pid is zero and
74 synch_process_tempfile's contents are irrelevant. Doing this via static
75 C variables is more convenient than putting them into the arguments
76 of record-unwind-protect, as they need to be updated at randomish
77 times in the code, and Lisp cannot always store these values as
78 Emacs integers. It's safe to use static variables here, as the
79 code is never invoked reentrantly. */
81 /* If nonzero, a process-ID that has not been reaped. */
82 static pid_t synch_process_pid
;
84 /* If a string, the name of a temp file that has not been removed. */
86 static Lisp_Object synch_process_tempfile
;
88 # define synch_process_tempfile make_number (0)
91 /* Indexes of file descriptors that need closing on call_process_kill. */
94 /* The subsidiary process's stdout and stderr. stdin is handled
95 separately, in either Fcall_process_region or create_temp_file. */
96 CALLPROC_STDOUT
, CALLPROC_STDERR
,
98 /* How to read from a pipe (or substitute) from the subsidiary process. */
101 /* A bound on the number of file descriptors. */
105 static Lisp_Object
call_process (ptrdiff_t, Lisp_Object
*, int, ptrdiff_t);
110 block_child_signal (void)
113 sigemptyset (&blocked
);
114 sigaddset (&blocked
, SIGCHLD
);
115 pthread_sigmask (SIG_BLOCK
, &blocked
, 0);
118 /* Unblock SIGCHLD. */
121 unblock_child_signal (void)
123 pthread_sigmask (SIG_SETMASK
, &empty_mask
, 0);
126 /* Return the current buffer's working directory, or the home
127 directory if it's unreachable, as a string suitable for a system call.
128 Signal an error if the result would not be an accessible directory. */
131 encode_current_directory (void)
136 dir
= BVAR (current_buffer
, directory
);
139 dir
= Funhandled_file_name_directory (dir
);
141 /* If the file name handler says that dir is unreachable, use
142 a sensible default. */
144 dir
= build_string ("~");
146 dir
= expand_and_dir_to_file (dir
, Qnil
);
148 if (STRING_MULTIBYTE (dir
))
149 dir
= ENCODE_FILE (dir
);
150 if (! file_accessible_directory_p (SSDATA (dir
)))
151 report_file_error ("Setting current directory",
152 BVAR (current_buffer
, directory
));
154 RETURN_UNGCPRO (dir
);
157 /* If P is reapable, record it as a deleted process and kill it.
158 Do this in a critical section. Unless PID is wedged it will be
159 reaped on receipt of the first SIGCHLD after the critical section. */
162 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
164 block_child_signal ();
168 record_deleted_pid (p
->pid
, tempfile
);
170 kill (- p
->pid
, SIGKILL
);
173 unblock_child_signal ();
176 /* Clean up files, file descriptors and processes created by Fcall_process. */
179 delete_temp_file (Lisp_Object name
)
181 unlink (SSDATA (name
));
185 call_process_kill (void *ptr
)
187 int *callproc_fd
= ptr
;
189 for (i
= 0; i
< CALLPROC_FDS
; i
++)
190 if (0 <= callproc_fd
[i
])
191 emacs_close (callproc_fd
[i
]);
193 if (synch_process_pid
)
195 struct Lisp_Process proc
;
197 proc
.pid
= synch_process_pid
;
198 record_kill_process (&proc
, synch_process_tempfile
);
199 synch_process_pid
= 0;
201 else if (STRINGP (synch_process_tempfile
))
202 delete_temp_file (synch_process_tempfile
);
205 /* Clean up when exiting Fcall_process: restore the buffer, and
206 kill the subsidiary process group if the process still exists. */
209 call_process_cleanup (Lisp_Object buffer
)
211 Fset_buffer (buffer
);
213 if (synch_process_pid
)
215 kill (-synch_process_pid
, SIGINT
);
216 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
219 wait_for_termination (synch_process_pid
, 0, 1);
220 synch_process_pid
= 0;
222 message1 ("Waiting for process to die...done");
227 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
229 static mode_t
const default_output_mode
= 0666;
232 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
233 doc
: /* Call PROGRAM synchronously in separate process.
234 The remaining arguments are optional.
235 The program's input comes from file INFILE (nil means `/dev/null').
236 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
237 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
238 FILE is a file name string, means that it should be written to that file
239 \(if the file already exists it is overwritten).
240 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
241 REAL-BUFFER says what to do with standard output, as above,
242 while STDERR-FILE says what to do with standard error in the child.
243 STDERR-FILE may be nil (discard standard error output),
244 t (mix it with ordinary output), or a file name string.
246 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
247 Remaining arguments are strings passed as command arguments to PROGRAM.
249 If executable PROGRAM can't be found as an executable, `call-process'
250 signals a Lisp error. `call-process' reports errors in execution of
251 the program only through its return and output.
253 If DESTINATION is 0, `call-process' returns immediately with value nil.
254 Otherwise it waits for PROGRAM to terminate
255 and returns a numeric exit status or a signal description string.
256 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
258 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
259 (ptrdiff_t nargs
, Lisp_Object
*args
)
261 Lisp_Object infile
, encoded_infile
;
264 ptrdiff_t count
= SPECPDL_INDEX ();
266 if (nargs
>= 2 && ! NILP (args
[1]))
268 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
269 CHECK_STRING (infile
);
272 infile
= build_string (NULL_DEVICE
);
275 encoded_infile
= STRING_MULTIBYTE (infile
) ? ENCODE_FILE (infile
) : infile
;
277 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
279 report_file_error ("Opening process input file", infile
);
280 record_unwind_protect_int (close_file_unwind
, filefd
);
282 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
285 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
287 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
288 unwinder that is intended to remove the input temporary file; in
289 this case NARGS must be at least 2 and ARGS[1] is the file's name.
291 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
294 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
295 ptrdiff_t tempfile_index
)
297 Lisp_Object buffer
, current_dir
, path
;
300 int callproc_fd
[CALLPROC_FDS
];
303 ptrdiff_t count
= SPECPDL_INDEX ();
307 /* File to use for stderr in the child.
308 t means use same as standard output. */
309 Lisp_Object error_file
;
310 Lisp_Object output_file
= Qnil
;
311 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
312 char *tempfile
= NULL
;
318 int fd_output
, fd_error
;
319 struct coding_system process_coding
; /* coding-system of process output */
320 struct coding_system argument_coding
; /* coding-system of arguments */
321 /* Set to the return value of Ffind_operation_coding_system. */
322 Lisp_Object coding_systems
;
325 if (synch_process_pid
)
326 error ("call-process invoked recursively");
328 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
331 CHECK_STRING (args
[0]);
336 /* Without asynchronous processes we cannot have BUFFER == 0. */
338 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
339 error ("Operating system cannot handle asynchronous subprocesses");
340 #endif /* subprocesses */
342 /* Decide the coding-system for giving arguments. */
344 Lisp_Object val
, *args2
;
346 /* If arguments are supplied, we may have to encode them. */
349 bool must_encode
= 0;
350 Lisp_Object coding_attrs
;
352 for (i
= 4; i
< nargs
; i
++)
353 CHECK_STRING (args
[i
]);
355 for (i
= 4; i
< nargs
; i
++)
356 if (STRING_MULTIBYTE (args
[i
]))
359 if (!NILP (Vcoding_system_for_write
))
360 val
= Vcoding_system_for_write
;
361 else if (! must_encode
)
365 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
366 args2
[0] = Qcall_process
;
367 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
368 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
369 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
371 val
= complement_process_encoding_system (val
);
372 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
373 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
374 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
376 /* We should not use an ASCII incompatible coding system. */
377 val
= raw_text_coding_system (val
);
378 setup_coding_system (val
, &argument_coding
);
389 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
390 FILE-FOR-STDERR), unless the first element is :file, in which case see
391 the next paragraph. */
392 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
394 if (CONSP (XCDR (buffer
)))
396 Lisp_Object stderr_file
;
397 stderr_file
= XCAR (XCDR (buffer
));
399 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
400 error_file
= stderr_file
;
402 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
405 buffer
= XCAR (buffer
);
408 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
409 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
411 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
412 BVAR (current_buffer
, directory
));
413 CHECK_STRING (output_file
);
417 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
419 Lisp_Object spec_buffer
;
420 spec_buffer
= buffer
;
421 buffer
= Fget_buffer_create (buffer
);
422 /* Mention the buffer name for a better error message. */
424 CHECK_BUFFER (spec_buffer
);
425 CHECK_BUFFER (buffer
);
429 /* Make sure that the child will be able to chdir to the current
430 buffer's current directory, or its unhandled equivalent. We
431 can't just have the child check for an error when it does the
432 chdir, since it's in a vfork.
434 We have to GCPRO around this because Fexpand_file_name,
435 Funhandled_file_name_directory, and Ffile_accessible_directory_p
436 might call a file name handling function. The argument list is
437 protected by the caller, so all we really have to worry about is
440 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
442 current_dir
= encode_current_directory ();
444 GCPRO4 (buffer
, current_dir
, error_file
, output_file
);
446 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
447 error_file
= ENCODE_FILE (error_file
);
448 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
449 output_file
= ENCODE_FILE (output_file
);
453 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
455 for (i
= 0; i
< CALLPROC_FDS
; i
++)
458 synch_process_tempfile
= make_number (0);
460 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
462 /* Search for program; barf if not found. */
464 struct gcpro gcpro1
, gcpro2
, gcpro3
;
467 GCPRO3 (buffer
, current_dir
, error_file
);
468 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
471 report_file_error ("Searching for program", args
[0]);
474 /* If program file name starts with /: for quoting a magic name,
476 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
477 && SREF (path
, 1) == ':')
478 path
= Fsubstring (path
, make_number (2), Qnil
);
480 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
483 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
485 GCPRO4 (buffer
, current_dir
, path
, error_file
);
490 argument_coding
.dst_multibyte
= 0;
491 for (i
= 4; i
< nargs
; i
++)
493 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
494 if (CODING_REQUIRE_ENCODING (&argument_coding
))
495 /* We must encode this argument. */
496 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
498 for (i
= 4; i
< nargs
; i
++)
499 new_argv
[i
- 3] = SSDATA (args
[i
]);
504 if (STRING_MULTIBYTE (path
))
505 path
= ENCODE_FILE (path
);
506 new_argv
[0] = SSDATA (path
);
510 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
513 if (! discard_output
&& ! STRINGP (output_file
))
515 char const *tmpdir
= egetenv ("TMPDIR");
516 char const *outf
= tmpdir
? tmpdir
: "";
517 tempfile
= alloca (strlen (outf
) + 20);
518 strcpy (tempfile
, outf
);
519 dostounix_filename (tempfile
, 0);
520 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
521 strcat (tempfile
, "/");
522 strcat (tempfile
, "detmp.XXX");
525 report_file_error ("Opening process output file", Qnil
);
526 output_file
= build_string (tempfile
);
527 synch_process_tempfile
= output_file
;
533 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
535 report_file_error ("Opening null device", Qnil
);
537 else if (STRINGP (output_file
))
539 fd_output
= emacs_open (SSDATA (output_file
),
540 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
541 default_output_mode
);
544 int open_errno
= errno
;
545 output_file
= DECODE_FILE (output_file
);
546 report_file_errno ("Opening process output file",
547 output_file
, open_errno
);
553 if (emacs_pipe (fd
) != 0)
554 report_file_error ("Creating process pipe", Qnil
);
555 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
558 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
560 fd_error
= fd_output
;
562 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
564 fd_error
= emacs_open ((STRINGP (error_file
)
565 ? SSDATA (error_file
)
567 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
568 default_output_mode
);
571 int open_errno
= errno
;
572 report_file_errno ("Cannot redirect stderr",
573 (STRINGP (error_file
)
574 ? DECODE_FILE (error_file
)
575 : build_string (NULL_DEVICE
)),
578 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
581 #ifdef MSDOS /* MW, July 1993 */
582 /* Note that on MSDOS `child_setup' actually returns the child process
583 exit status, not its PID, so assign it to status below. */
584 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
589 unbind_to (count
, Qnil
);
590 synchronize_system_messages_locale ();
592 code_convert_string_norecord (build_string (strerror (child_errno
)),
593 Vlocale_coding_system
, 0);
597 for (i
= 0; i
< CALLPROC_FDS
; i
++)
598 if (0 <= callproc_fd
[i
])
600 emacs_close (callproc_fd
[i
]);
603 emacs_close (filefd
);
604 clear_unwind_protect (count
- 1);
608 /* Since CRLF is converted to LF within `decode_coding', we
609 can always open a file with binary mode. */
610 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
611 O_RDONLY
| O_BINARY
, 0);
612 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
614 int open_errno
= errno
;
615 report_file_errno ("Cannot re-open temporary file",
616 build_string (tempfile
), open_errno
);
622 /* Do the unwind-protect now, even though the pid is not known, so
623 that no storage allocation is done in the critical section.
624 The actual PID will be filled in during the critical section. */
625 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
630 block_child_signal ();
633 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
634 #else /* not WINDOWSNT */
636 /* vfork, and prevent local vars from being clobbered by the vfork. */
638 Lisp_Object
volatile buffer_volatile
= buffer
;
639 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
640 Lisp_Object
volatile current_dir_volatile
= current_dir
;
641 bool volatile display_p_volatile
= display_p
;
642 bool volatile sa_must_free_volatile
= sa_must_free
;
643 int volatile fd_error_volatile
= fd_error
;
644 int volatile filefd_volatile
= filefd
;
645 ptrdiff_t volatile count_volatile
= count
;
646 ptrdiff_t volatile sa_count_volatile
= sa_count
;
647 char **volatile new_argv_volatile
= new_argv
;
648 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
649 for (i
= 0; i
< CALLPROC_FDS
; i
++)
650 callproc_fd_volatile
[i
] = callproc_fd
[i
];
654 buffer
= buffer_volatile
;
655 coding_systems
= coding_systems_volatile
;
656 current_dir
= current_dir_volatile
;
657 display_p
= display_p_volatile
;
658 sa_must_free
= sa_must_free_volatile
;
659 fd_error
= fd_error_volatile
;
660 filefd
= filefd_volatile
;
661 count
= count_volatile
;
662 sa_count
= sa_count_volatile
;
663 new_argv
= new_argv_volatile
;
665 for (i
= 0; i
< CALLPROC_FDS
; i
++)
666 callproc_fd
[i
] = callproc_fd_volatile
[i
];
667 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
672 unblock_child_signal ();
676 /* Emacs ignores SIGPIPE, but the child should not. */
677 signal (SIGPIPE
, SIG_DFL
);
679 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
682 #endif /* not WINDOWSNT */
688 synch_process_pid
= pid
;
690 if (INTEGERP (buffer
))
692 if (tempfile_index
< 0)
693 record_deleted_pid (pid
, Qnil
);
697 record_deleted_pid (pid
, args
[1]);
698 clear_unwind_protect (tempfile_index
);
700 synch_process_pid
= 0;
704 unblock_child_signal ();
707 #endif /* not MSDOS */
710 report_file_errno ("Doing vfork", Qnil
, child_errno
);
712 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
713 since we will use that to read input from. */
714 for (i
= 0; i
< CALLPROC_FDS
; i
++)
715 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
717 emacs_close (callproc_fd
[i
]);
720 emacs_close (filefd
);
721 clear_unwind_protect (count
- 1);
723 if (INTEGERP (buffer
))
724 return unbind_to (count
, Qnil
);
726 if (BUFFERP (buffer
))
727 Fset_buffer (buffer
);
729 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
733 Lisp_Object val
, *args2
;
736 if (!NILP (Vcoding_system_for_read
))
737 val
= Vcoding_system_for_read
;
740 if (EQ (coding_systems
, Qt
))
744 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
745 args2
[0] = Qcall_process
;
746 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
748 = Ffind_operation_coding_system (nargs
+ 1, args2
);
750 if (CONSP (coding_systems
))
751 val
= XCAR (coding_systems
);
752 else if (CONSP (Vdefault_process_coding_system
))
753 val
= XCAR (Vdefault_process_coding_system
);
757 Fcheck_coding_system (val
);
758 /* In unibyte mode, character code conversion should not take
759 place but EOL conversion should. So, setup raw-text or one
760 of the subsidiary according to the information just setup. */
761 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
763 val
= raw_text_coding_system (val
);
764 setup_coding_system (val
, &process_coding
);
765 process_coding
.dst_multibyte
766 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
767 process_coding
.src_multibyte
= 0;
775 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
776 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
777 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
778 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
780 EMACS_INT total_read
= 0;
782 bool display_on_the_fly
= display_p
;
783 struct coding_system saved_coding
= process_coding
;
787 /* Repeatedly read until we've filled as much as possible
788 of the buffer size we have. But don't read
789 less than 1024--save that for the next bufferful. */
791 while (nread
< bufsize
- 1024)
793 int this_read
= emacs_read (fd0
, buf
+ nread
,
801 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
806 total_read
+= this_read
;
808 if (display_on_the_fly
)
812 /* Now NREAD is the total amount of data in the buffer. */
815 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
816 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
817 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
819 { /* We have to decode the input. */
821 ptrdiff_t count1
= SPECPDL_INDEX ();
823 XSETBUFFER (curbuf
, current_buffer
);
824 prepare_to_modify_buffer (PT
, PT
, NULL
);
825 /* We cannot allow after-change-functions be run
826 during decoding, because that might modify the
827 buffer, while we rely on process_coding.produced to
828 faithfully reflect inserted text until we
829 TEMP_SET_PT_BOTH below. */
830 specbind (Qinhibit_modification_hooks
, Qt
);
831 decode_coding_c_string (&process_coding
,
832 (unsigned char *) buf
, nread
, curbuf
);
833 unbind_to (count1
, Qnil
);
834 if (display_on_the_fly
835 && CODING_REQUIRE_DETECTION (&saved_coding
)
836 && ! CODING_REQUIRE_DETECTION (&process_coding
))
838 /* We have detected some coding system, but the
839 detection may have been via insufficient data.
840 So give up displaying on the fly. */
841 if (process_coding
.produced
> 0)
842 del_range_2 (process_coding
.dst_pos
,
843 process_coding
.dst_pos_byte
,
844 (process_coding
.dst_pos
845 + process_coding
.produced_char
),
846 (process_coding
.dst_pos_byte
847 + process_coding
.produced
),
849 display_on_the_fly
= 0;
850 process_coding
= saved_coding
;
852 /* Make the above condition always fail in the future. */
853 saved_coding
.common_flags
854 &= ~CODING_REQUIRE_DETECTION_MASK
;
858 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
859 PT_BYTE
+ process_coding
.produced
);
860 carryover
= process_coding
.carryover_bytes
;
862 memcpy (buf
, process_coding
.carryover
,
863 process_coding
.carryover_bytes
);
866 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
869 /* Make the buffer bigger as we continue to read more data,
870 but not past CALLPROC_BUFFER_SIZE_MAX. */
871 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
872 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
873 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
877 redisplay_preserve_echo_area (1);
878 /* This variable might have been set to 0 for code
879 detection. In that case, set it back to 1 because
880 we should have already detected a coding system. */
881 display_on_the_fly
= 1;
888 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
889 /* If the caller required, let the buffer inherit the
890 coding-system used to decode the process output. */
891 if (inherit_process_coding_system
)
892 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
893 make_number (total_read
));
897 /* Wait for it to terminate, unless it already has. */
898 wait_for_termination (pid
, &status
, fd0
< 0);
903 /* Don't kill any children that the subprocess may have left behind
905 synch_process_pid
= 0;
908 unbind_to (count
, Qnil
);
910 if (WIFSIGNALED (status
))
914 synchronize_system_messages_locale ();
915 signame
= strsignal (WTERMSIG (status
));
920 return code_convert_string_norecord (build_string (signame
),
921 Vlocale_coding_system
, 0);
924 eassert (WIFEXITED (status
));
925 return make_number (WEXITSTATUS (status
));
928 /* Create a temporary file suitable for storing the input data of
929 call-process-region. NARGS and ARGS are the same as for
930 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
931 naming the file, and return a file descriptor for reading.
932 Unwind-protect the file, so that the file descriptor will be closed
933 and the file removed when the caller unwinds the specpdl stack. */
936 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
937 Lisp_Object
*filename_string_ptr
)
941 Lisp_Object filename_string
;
942 Lisp_Object val
, start
, end
;
945 if (STRINGP (Vtemporary_file_directory
))
946 tmpdir
= Vtemporary_file_directory
;
951 outf
= getenv ("TMPDIR");
952 tmpdir
= build_string (outf
? outf
: "/tmp/");
954 if ((outf
= egetenv ("TMPDIR"))
955 || (outf
= egetenv ("TMP"))
956 || (outf
= egetenv ("TEMP")))
957 tmpdir
= build_string (outf
);
959 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
964 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
969 /* Cannot use the result of Fexpand_file_name, because it
970 downcases the XXXXXX part of the pattern, and mktemp then
971 doesn't recognize it. */
972 if (!NILP (Vw32_downcase_file_names
))
974 Lisp_Object dirname
= Ffile_name_directory (pattern
);
977 pattern
= Vtemp_file_name_pattern
;
979 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
983 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
984 GCPRO1 (filename_string
);
985 tempfile
= SSDATA (filename_string
);
987 count
= SPECPDL_INDEX ();
988 record_unwind_protect_nothing ();
989 fd
= mkostemp (tempfile
, O_CLOEXEC
);
991 report_file_error ("Failed to open temporary file using pattern",
993 set_unwind_protect (count
, delete_temp_file
, filename_string
);
994 record_unwind_protect_int (close_file_unwind
, fd
);
999 /* Decide coding-system of the contents of the temporary file. */
1000 if (!NILP (Vcoding_system_for_write
))
1001 val
= Vcoding_system_for_write
;
1002 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1006 Lisp_Object coding_systems
;
1009 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1010 args2
[0] = Qcall_process_region
;
1011 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1012 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1013 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1016 val
= complement_process_encoding_system (val
);
1019 ptrdiff_t count1
= SPECPDL_INDEX ();
1021 specbind (intern ("coding-system-for-write"), val
);
1022 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1023 happen to get a ".Z" suffix. */
1024 specbind (intern ("file-name-handler-alist"), Qnil
);
1025 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1027 unbind_to (count1
, Qnil
);
1030 if (lseek (fd
, 0, SEEK_SET
) < 0)
1031 report_file_error ("Setting file position", filename_string
);
1033 /* Note that Fcall_process takes care of binding
1034 coding-system-for-read. */
1036 *filename_string_ptr
= filename_string
;
1041 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1043 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1044 The remaining arguments are optional.
1045 Delete the text if fourth arg DELETE is non-nil.
1047 Insert output in BUFFER before point; t means current buffer; nil for
1048 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1049 FILE)', where FILE is a file name string, means that it should be
1050 written to that file (if the file already exists it is overwritten).
1051 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1052 REAL-BUFFER says what to do with standard output, as above,
1053 while STDERR-FILE says what to do with standard error in the child.
1054 STDERR-FILE may be nil (discard standard error output),
1055 t (mix it with ordinary output), or a file name string.
1057 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1058 Remaining args are passed to PROGRAM at startup as command args.
1060 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1061 Otherwise it waits for PROGRAM to terminate
1062 and returns a numeric exit status or a signal description string.
1063 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1065 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1066 (ptrdiff_t nargs
, Lisp_Object
*args
)
1068 struct gcpro gcpro1
;
1069 Lisp_Object infile
, val
;
1070 ptrdiff_t count
= SPECPDL_INDEX ();
1071 Lisp_Object start
= args
[0];
1072 Lisp_Object end
= args
[1];
1076 if (STRINGP (start
))
1077 empty_input
= SCHARS (start
) == 0;
1078 else if (NILP (start
))
1079 empty_input
= BEG
== Z
;
1082 validate_region (&args
[0], &args
[1]);
1085 empty_input
= XINT (start
) == XINT (end
);
1089 fd
= create_temp_file (nargs
, args
, &infile
);
1093 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1095 report_file_error ("Opening null device", Qnil
);
1096 record_unwind_protect_int (close_file_unwind
, fd
);
1101 if (nargs
> 3 && !NILP (args
[3]))
1102 Fdelete_region (start
, end
);
1116 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1117 RETURN_UNGCPRO (unbind_to (count
, val
));
1121 static int relocate_fd (int fd
, int minfd
);
1125 add_env (char **env
, char **new_env
, char *string
)
1132 /* See if this string duplicates any string already in the env.
1133 If so, don't put it in.
1134 When an env var has multiple definitions,
1135 we keep the definition that comes first in process-environment. */
1136 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1138 char *p
= *ep
, *q
= string
;
1144 /* The string is a lone variable name; keep it for now, we
1145 will remove it later. It is a placeholder for a
1146 variable that is not to be included in the environment. */
1154 *new_env
++ = string
;
1158 /* This is the last thing run in a newly forked inferior
1159 either synchronous or asynchronous.
1160 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1161 Initialize inferior's priority, pgrp, connected dir and environment.
1162 then exec another program based on new_argv.
1164 If SET_PGRP, put the subprocess into a separate process group.
1166 CURRENT_DIR is an elisp string giving the path of the current
1167 directory the subprocess should have. Since we can't really signal
1168 a decent error from within the child, this should be verified as an
1169 executable directory by the parent. */
1172 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1173 Lisp_Object current_dir
)
1183 pid_t pid
= getpid ();
1184 #endif /* WINDOWSNT */
1186 /* Note that use of alloca is always safe here. It's obvious for systems
1187 that do not have true vfork or that have true (stack) alloca.
1188 If using vfork and C_ALLOCA (when Emacs used to include
1189 src/alloca.c) it is safe because that changes the superior's
1190 static variables as if the superior had done alloca and will be
1191 cleaned up in the usual way. */
1196 i
= SBYTES (current_dir
);
1198 /* MSDOS must have all environment variables malloc'ed, because
1199 low-level libc functions that launch subsidiary processes rely
1201 pwd_var
= xmalloc (i
+ 5);
1203 pwd_var
= alloca (i
+ 5);
1206 memcpy (pwd_var
, "PWD=", 4);
1207 strcpy (temp
, SSDATA (current_dir
));
1210 /* We can't signal an Elisp error here; we're in a vfork. Since
1211 the callers check the current directory before forking, this
1212 should only return an error if the directory's permissions
1213 are changed between the check and this chdir, but we should
1215 if (chdir (temp
) < 0)
1216 _exit (EXIT_CANCELED
);
1218 /* Get past the drive letter, so that d:/ is left alone. */
1219 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1226 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1227 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1231 /* Set `env' to a vector of the strings in the environment. */
1233 register Lisp_Object tem
;
1234 register char **new_env
;
1236 register int new_length
;
1237 Lisp_Object display
= Qnil
;
1241 for (tem
= Vprocess_environment
;
1242 CONSP (tem
) && STRINGP (XCAR (tem
));
1245 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1246 && (SDATA (XCAR (tem
)) [7] == '\0'
1247 || SDATA (XCAR (tem
)) [7] == '='))
1248 /* DISPLAY is specified in process-environment. */
1253 /* If not provided yet, use the frame's DISPLAY. */
1256 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1257 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1258 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1259 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1260 Vinitial_environment
);
1268 /* new_length + 2 to include PWD and terminating 0. */
1269 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1270 /* If we have a PWD envvar, pass one down,
1271 but with corrected value. */
1272 if (egetenv ("PWD"))
1273 *new_env
++ = pwd_var
;
1275 if (STRINGP (display
))
1277 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1278 strcpy (vdata
, "DISPLAY=");
1279 strcat (vdata
, SSDATA (display
));
1280 new_env
= add_env (env
, new_env
, vdata
);
1284 for (tem
= Vprocess_environment
;
1285 CONSP (tem
) && STRINGP (XCAR (tem
));
1287 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1291 /* Remove variable names without values. */
1295 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1305 prepare_standard_handles (in
, out
, err
, handles
);
1306 set_process_dir (SDATA (current_dir
));
1307 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1308 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1309 reset_standard_handles (in
, out
, err
, handles
);
1311 /* An error occurred while trying to spawn the process. */
1312 report_file_error ("Spawning child process", Qnil
);
1315 #else /* not WINDOWSNT */
1316 /* Make sure that in, out, and err are not actually already in
1317 descriptors zero, one, or two; this could happen if Emacs is
1318 started with its standard in, out, or error closed, as might
1321 int oin
= in
, oout
= out
;
1323 /* We have to avoid relocating the same descriptor twice! */
1325 in
= relocate_fd (in
, 3);
1330 out
= relocate_fd (out
, 3);
1334 else if (err
== oout
)
1337 err
= relocate_fd (err
, 3);
1341 /* Redirect file descriptors and clear the close-on-exec flag on the
1342 redirected ones. IN, OUT, and ERR are close-on-exec so they
1343 need not be closed explicitly. */
1351 execve (new_argv
[0], new_argv
, env
);
1354 /* Avoid deadlock if the child's perror writes to a full pipe; the
1355 pipe's reader is the parent, but with vfork the parent can't
1356 run until the child exits. Truncate the diagnostic instead. */
1357 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1360 emacs_perror (new_argv
[0]);
1361 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1364 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1367 /* An error occurred while trying to run the subprocess. */
1368 report_file_error ("Spawning child process", Qnil
);
1371 #endif /* not WINDOWSNT */
1375 /* Move the file descriptor FD so that its number is not less than MINFD.
1376 If the file descriptor is moved at all, the original is closed on MSDOS,
1377 but not elsewhere as the caller will close it anyway. */
1379 relocate_fd (int fd
, int minfd
)
1385 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1388 emacs_perror ("while setting up child");
1389 _exit (EXIT_CANCELED
);
1397 #endif /* not WINDOWSNT */
1400 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1401 ptrdiff_t *valuelen
, Lisp_Object env
)
1403 for (; CONSP (env
); env
= XCDR (env
))
1405 Lisp_Object entry
= XCAR (env
);
1407 && SBYTES (entry
) >= varlen
1409 /* NT environment variables are case insensitive. */
1410 && ! strnicmp (SDATA (entry
), var
, varlen
)
1411 #else /* not WINDOWSNT */
1412 && ! memcmp (SDATA (entry
), var
, varlen
)
1413 #endif /* not WINDOWSNT */
1416 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1418 *value
= SSDATA (entry
) + (varlen
+ 1);
1419 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1422 else if (SBYTES (entry
) == varlen
)
1424 /* Lone variable names in Vprocess_environment mean that
1425 variable should be removed from the environment. */
1435 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1436 ptrdiff_t *valuelen
, Lisp_Object frame
)
1438 /* Try to find VAR in Vprocess_environment first. */
1439 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1440 Vprocess_environment
))
1441 return *value
? 1 : 0;
1443 /* For DISPLAY try to get the values from the frame or the initial env. */
1444 if (strcmp (var
, "DISPLAY") == 0)
1447 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1448 if (STRINGP (display
))
1450 *value
= SSDATA (display
);
1451 *valuelen
= SBYTES (display
);
1454 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1455 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1456 Vinitial_environment
))
1457 return *value
? 1 : 0;
1463 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1464 doc
: /* Get the value of environment variable VARIABLE.
1465 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1466 the environment. Otherwise, value is a string.
1468 This function searches `process-environment' for VARIABLE.
1470 If optional parameter ENV is a list, then search this list instead of
1471 `process-environment', and return t when encountering a negative entry
1472 \(an entry for a variable with no value). */)
1473 (Lisp_Object variable
, Lisp_Object env
)
1478 CHECK_STRING (variable
);
1481 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1482 &value
, &valuelen
, env
))
1483 return value
? make_string (value
, valuelen
) : Qt
;
1487 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1488 &value
, &valuelen
, env
))
1489 return make_string (value
, valuelen
);
1494 /* A version of getenv that consults the Lisp environment lists,
1495 easily callable from C. */
1497 egetenv (const char *var
)
1502 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1509 /* This is run before init_cmdargs. */
1512 init_callproc_1 (void)
1515 const char *etc_dir
= ns_etc_directory ();
1516 const char *path_exec
= ns_exec_path ();
1519 Vdata_directory
= decode_env_path ("EMACSDATA",
1524 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1526 Vdoc_directory
= decode_env_path ("EMACSDOC",
1531 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1533 /* Check the EMACSPATH environment variable, defaulting to the
1534 PATH_EXEC path from epaths.h. */
1535 Vexec_path
= decode_env_path ("EMACSPATH",
1537 path_exec
? path_exec
:
1540 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1541 /* FIXME? For ns, path_exec should go at the front? */
1542 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1545 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1548 init_callproc (void)
1550 char *data_dir
= egetenv ("EMACSDATA");
1553 Lisp_Object tempdir
;
1557 const char *etc_dir
= ns_etc_directory ();
1560 data_dir
= alloca (strlen (etc_dir
) + 1);
1561 strcpy (data_dir
, etc_dir
);
1566 if (!NILP (Vinstallation_directory
))
1568 /* Add to the path the lib-src subdir of the installation dir. */
1570 tem
= Fexpand_file_name (build_string ("lib-src"),
1571 Vinstallation_directory
);
1573 /* MSDOS uses wrapped binaries, so don't do this. */
1574 if (NILP (Fmember (tem
, Vexec_path
)))
1577 const char *path_exec
= ns_exec_path ();
1579 Vexec_path
= decode_env_path ("EMACSPATH",
1581 path_exec
? path_exec
:
1584 Vexec_path
= Fcons (tem
, Vexec_path
);
1585 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1588 Vexec_directory
= Ffile_name_as_directory (tem
);
1589 #endif /* not MSDOS */
1591 /* Maybe use ../etc as well as ../lib-src. */
1594 tem
= Fexpand_file_name (build_string ("etc"),
1595 Vinstallation_directory
);
1596 Vdoc_directory
= Ffile_name_as_directory (tem
);
1600 /* Look for the files that should be in etc. We don't use
1601 Vinstallation_directory, because these files are never installed
1602 near the executable, and they are never in the build
1603 directory when that's different from the source directory.
1605 Instead, if these files are not in the nominal place, we try the
1606 source directory. */
1609 Lisp_Object tem
, tem1
, srcdir
;
1611 srcdir
= Fexpand_file_name (build_string ("../src/"),
1612 build_unibyte_string (PATH_DUMPLOADSEARCH
));
1613 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1614 tem1
= Ffile_exists_p (tem
);
1615 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1618 newdir
= Fexpand_file_name (build_string ("../etc/"),
1619 build_unibyte_string (PATH_DUMPLOADSEARCH
));
1620 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1621 tem1
= Ffile_exists_p (tem
);
1623 Vdata_directory
= newdir
;
1631 tempdir
= Fdirectory_file_name (Vexec_directory
);
1632 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1633 dir_warning ("arch-dependent data dir", Vexec_directory
);
1636 tempdir
= Fdirectory_file_name (Vdata_directory
);
1637 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1638 dir_warning ("arch-independent data dir", Vdata_directory
);
1640 sh
= getenv ("SHELL");
1641 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1644 Vshared_game_score_directory
= Qnil
;
1646 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1647 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1648 Vshared_game_score_directory
= Qnil
;
1653 set_initial_environment (void)
1656 for (envp
= environ
; *envp
; envp
++)
1657 Vprocess_environment
= Fcons (build_string (*envp
),
1658 Vprocess_environment
);
1659 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1660 to use `delete' and friends on process-environment. */
1661 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1665 syms_of_callproc (void)
1668 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1669 #elif defined (WINDOWSNT)
1670 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1672 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1674 staticpro (&Vtemp_file_name_pattern
);
1677 synch_process_tempfile
= make_number (0);
1678 staticpro (&synch_process_tempfile
);
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
);