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
,
469 make_number (X_OK
), false);
472 report_file_error ("Searching for program", args
[0]);
475 /* If program file name starts with /: for quoting a magic name,
477 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
478 && SREF (path
, 1) == ':')
479 path
= Fsubstring (path
, make_number (2), Qnil
);
481 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
484 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
486 GCPRO4 (buffer
, current_dir
, path
, error_file
);
491 argument_coding
.dst_multibyte
= 0;
492 for (i
= 4; i
< nargs
; i
++)
494 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
495 if (CODING_REQUIRE_ENCODING (&argument_coding
))
496 /* We must encode this argument. */
497 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
499 for (i
= 4; i
< nargs
; i
++)
500 new_argv
[i
- 3] = SSDATA (args
[i
]);
505 if (STRING_MULTIBYTE (path
))
506 path
= ENCODE_FILE (path
);
507 new_argv
[0] = SSDATA (path
);
511 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
514 if (! discard_output
&& ! STRINGP (output_file
))
516 char const *tmpdir
= egetenv ("TMPDIR");
517 char const *outf
= tmpdir
? tmpdir
: "";
518 tempfile
= alloca (strlen (outf
) + 20);
519 strcpy (tempfile
, outf
);
520 dostounix_filename (tempfile
, 0);
521 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
522 strcat (tempfile
, "/");
523 strcat (tempfile
, "detmp.XXX");
526 report_file_error ("Opening process output file", Qnil
);
527 output_file
= build_string (tempfile
);
528 synch_process_tempfile
= output_file
;
534 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
536 report_file_error ("Opening null device", Qnil
);
538 else if (STRINGP (output_file
))
540 fd_output
= emacs_open (SSDATA (output_file
),
541 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
542 default_output_mode
);
545 int open_errno
= errno
;
546 output_file
= DECODE_FILE (output_file
);
547 report_file_errno ("Opening process output file",
548 output_file
, open_errno
);
554 if (emacs_pipe (fd
) != 0)
555 report_file_error ("Creating process pipe", Qnil
);
556 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
559 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
561 fd_error
= fd_output
;
563 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
565 fd_error
= emacs_open ((STRINGP (error_file
)
566 ? SSDATA (error_file
)
568 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
569 default_output_mode
);
572 int open_errno
= errno
;
573 report_file_errno ("Cannot redirect stderr",
574 (STRINGP (error_file
)
575 ? DECODE_FILE (error_file
)
576 : build_string (NULL_DEVICE
)),
579 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
582 #ifdef MSDOS /* MW, July 1993 */
583 /* Note that on MSDOS `child_setup' actually returns the child process
584 exit status, not its PID, so assign it to status below. */
585 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
590 unbind_to (count
, Qnil
);
591 synchronize_system_messages_locale ();
593 code_convert_string_norecord (build_string (strerror (child_errno
)),
594 Vlocale_coding_system
, 0);
598 for (i
= 0; i
< CALLPROC_FDS
; i
++)
599 if (0 <= callproc_fd
[i
])
601 emacs_close (callproc_fd
[i
]);
604 emacs_close (filefd
);
605 clear_unwind_protect (count
- 1);
609 /* Since CRLF is converted to LF within `decode_coding', we
610 can always open a file with binary mode. */
611 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
612 O_RDONLY
| O_BINARY
, 0);
613 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
615 int open_errno
= errno
;
616 report_file_errno ("Cannot re-open temporary file",
617 build_string (tempfile
), open_errno
);
623 /* Do the unwind-protect now, even though the pid is not known, so
624 that no storage allocation is done in the critical section.
625 The actual PID will be filled in during the critical section. */
626 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
631 block_child_signal ();
634 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
635 #else /* not WINDOWSNT */
637 /* vfork, and prevent local vars from being clobbered by the vfork. */
639 Lisp_Object
volatile buffer_volatile
= buffer
;
640 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
641 Lisp_Object
volatile current_dir_volatile
= current_dir
;
642 bool volatile display_p_volatile
= display_p
;
643 bool volatile sa_must_free_volatile
= sa_must_free
;
644 int volatile fd_error_volatile
= fd_error
;
645 int volatile filefd_volatile
= filefd
;
646 ptrdiff_t volatile count_volatile
= count
;
647 ptrdiff_t volatile sa_count_volatile
= sa_count
;
648 char **volatile new_argv_volatile
= new_argv
;
649 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
650 for (i
= 0; i
< CALLPROC_FDS
; i
++)
651 callproc_fd_volatile
[i
] = callproc_fd
[i
];
655 buffer
= buffer_volatile
;
656 coding_systems
= coding_systems_volatile
;
657 current_dir
= current_dir_volatile
;
658 display_p
= display_p_volatile
;
659 sa_must_free
= sa_must_free_volatile
;
660 fd_error
= fd_error_volatile
;
661 filefd
= filefd_volatile
;
662 count
= count_volatile
;
663 sa_count
= sa_count_volatile
;
664 new_argv
= new_argv_volatile
;
666 for (i
= 0; i
< CALLPROC_FDS
; i
++)
667 callproc_fd
[i
] = callproc_fd_volatile
[i
];
668 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
673 unblock_child_signal ();
677 /* Emacs ignores SIGPIPE, but the child should not. */
678 signal (SIGPIPE
, SIG_DFL
);
680 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
683 #endif /* not WINDOWSNT */
689 synch_process_pid
= pid
;
691 if (INTEGERP (buffer
))
693 if (tempfile_index
< 0)
694 record_deleted_pid (pid
, Qnil
);
698 record_deleted_pid (pid
, args
[1]);
699 clear_unwind_protect (tempfile_index
);
701 synch_process_pid
= 0;
705 unblock_child_signal ();
708 #endif /* not MSDOS */
711 report_file_errno ("Doing vfork", Qnil
, child_errno
);
713 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
714 since we will use that to read input from. */
715 for (i
= 0; i
< CALLPROC_FDS
; i
++)
716 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
718 emacs_close (callproc_fd
[i
]);
721 emacs_close (filefd
);
722 clear_unwind_protect (count
- 1);
724 if (INTEGERP (buffer
))
725 return unbind_to (count
, Qnil
);
727 if (BUFFERP (buffer
))
728 Fset_buffer (buffer
);
730 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
734 Lisp_Object val
, *args2
;
737 if (!NILP (Vcoding_system_for_read
))
738 val
= Vcoding_system_for_read
;
741 if (EQ (coding_systems
, Qt
))
745 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
746 args2
[0] = Qcall_process
;
747 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
749 = Ffind_operation_coding_system (nargs
+ 1, args2
);
751 if (CONSP (coding_systems
))
752 val
= XCAR (coding_systems
);
753 else if (CONSP (Vdefault_process_coding_system
))
754 val
= XCAR (Vdefault_process_coding_system
);
758 Fcheck_coding_system (val
);
759 /* In unibyte mode, character code conversion should not take
760 place but EOL conversion should. So, setup raw-text or one
761 of the subsidiary according to the information just setup. */
762 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
764 val
= raw_text_coding_system (val
);
765 setup_coding_system (val
, &process_coding
);
766 process_coding
.dst_multibyte
767 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
768 process_coding
.src_multibyte
= 0;
776 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
777 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
778 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
779 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
781 EMACS_INT total_read
= 0;
783 bool display_on_the_fly
= display_p
;
784 struct coding_system saved_coding
= process_coding
;
788 /* Repeatedly read until we've filled as much as possible
789 of the buffer size we have. But don't read
790 less than 1024--save that for the next bufferful. */
792 while (nread
< bufsize
- 1024)
794 int this_read
= emacs_read (fd0
, buf
+ nread
,
802 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
807 total_read
+= this_read
;
809 if (display_on_the_fly
)
813 /* Now NREAD is the total amount of data in the buffer. */
816 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
817 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
818 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
820 { /* We have to decode the input. */
822 ptrdiff_t count1
= SPECPDL_INDEX ();
824 XSETBUFFER (curbuf
, current_buffer
);
825 prepare_to_modify_buffer (PT
, PT
, NULL
);
826 /* We cannot allow after-change-functions be run
827 during decoding, because that might modify the
828 buffer, while we rely on process_coding.produced to
829 faithfully reflect inserted text until we
830 TEMP_SET_PT_BOTH below. */
831 specbind (Qinhibit_modification_hooks
, Qt
);
832 decode_coding_c_string (&process_coding
,
833 (unsigned char *) buf
, nread
, curbuf
);
834 unbind_to (count1
, Qnil
);
835 if (display_on_the_fly
836 && CODING_REQUIRE_DETECTION (&saved_coding
)
837 && ! CODING_REQUIRE_DETECTION (&process_coding
))
839 /* We have detected some coding system, but the
840 detection may have been via insufficient data.
841 So give up displaying on the fly. */
842 if (process_coding
.produced
> 0)
843 del_range_2 (process_coding
.dst_pos
,
844 process_coding
.dst_pos_byte
,
845 (process_coding
.dst_pos
846 + process_coding
.produced_char
),
847 (process_coding
.dst_pos_byte
848 + process_coding
.produced
),
850 display_on_the_fly
= 0;
851 process_coding
= saved_coding
;
853 /* Make the above condition always fail in the future. */
854 saved_coding
.common_flags
855 &= ~CODING_REQUIRE_DETECTION_MASK
;
859 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
860 PT_BYTE
+ process_coding
.produced
);
861 carryover
= process_coding
.carryover_bytes
;
863 memcpy (buf
, process_coding
.carryover
,
864 process_coding
.carryover_bytes
);
867 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
870 /* Make the buffer bigger as we continue to read more data,
871 but not past CALLPROC_BUFFER_SIZE_MAX. */
872 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
873 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
874 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
878 redisplay_preserve_echo_area (1);
879 /* This variable might have been set to 0 for code
880 detection. In that case, set it back to 1 because
881 we should have already detected a coding system. */
882 display_on_the_fly
= 1;
889 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
890 /* If the caller required, let the buffer inherit the
891 coding-system used to decode the process output. */
892 if (inherit_process_coding_system
)
893 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
894 make_number (total_read
));
898 /* Wait for it to terminate, unless it already has. */
899 wait_for_termination (pid
, &status
, fd0
< 0);
904 /* Don't kill any children that the subprocess may have left behind
906 synch_process_pid
= 0;
909 unbind_to (count
, Qnil
);
911 if (WIFSIGNALED (status
))
915 synchronize_system_messages_locale ();
916 signame
= strsignal (WTERMSIG (status
));
921 return code_convert_string_norecord (build_string (signame
),
922 Vlocale_coding_system
, 0);
925 eassert (WIFEXITED (status
));
926 return make_number (WEXITSTATUS (status
));
929 /* Create a temporary file suitable for storing the input data of
930 call-process-region. NARGS and ARGS are the same as for
931 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
932 naming the file, and return a file descriptor for reading.
933 Unwind-protect the file, so that the file descriptor will be closed
934 and the file removed when the caller unwinds the specpdl stack. */
937 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
938 Lisp_Object
*filename_string_ptr
)
942 Lisp_Object filename_string
;
943 Lisp_Object val
, start
, end
;
946 if (STRINGP (Vtemporary_file_directory
))
947 tmpdir
= Vtemporary_file_directory
;
952 outf
= getenv ("TMPDIR");
953 tmpdir
= build_string (outf
? outf
: "/tmp/");
955 if ((outf
= egetenv ("TMPDIR"))
956 || (outf
= egetenv ("TMP"))
957 || (outf
= egetenv ("TEMP")))
958 tmpdir
= build_string (outf
);
960 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
965 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
970 /* Cannot use the result of Fexpand_file_name, because it
971 downcases the XXXXXX part of the pattern, and mktemp then
972 doesn't recognize it. */
973 if (!NILP (Vw32_downcase_file_names
))
975 Lisp_Object dirname
= Ffile_name_directory (pattern
);
978 pattern
= Vtemp_file_name_pattern
;
980 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
984 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
985 GCPRO1 (filename_string
);
986 tempfile
= SSDATA (filename_string
);
988 count
= SPECPDL_INDEX ();
989 record_unwind_protect_nothing ();
990 fd
= mkostemp (tempfile
, O_CLOEXEC
);
992 report_file_error ("Failed to open temporary file using pattern",
994 set_unwind_protect (count
, delete_temp_file
, filename_string
);
995 record_unwind_protect_int (close_file_unwind
, fd
);
1000 /* Decide coding-system of the contents of the temporary file. */
1001 if (!NILP (Vcoding_system_for_write
))
1002 val
= Vcoding_system_for_write
;
1003 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1007 Lisp_Object coding_systems
;
1010 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1011 args2
[0] = Qcall_process_region
;
1012 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1013 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1014 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1017 val
= complement_process_encoding_system (val
);
1020 ptrdiff_t count1
= SPECPDL_INDEX ();
1022 specbind (intern ("coding-system-for-write"), val
);
1023 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1024 happen to get a ".Z" suffix. */
1025 specbind (intern ("file-name-handler-alist"), Qnil
);
1026 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1028 unbind_to (count1
, Qnil
);
1031 if (lseek (fd
, 0, SEEK_SET
) < 0)
1032 report_file_error ("Setting file position", filename_string
);
1034 /* Note that Fcall_process takes care of binding
1035 coding-system-for-read. */
1037 *filename_string_ptr
= filename_string
;
1042 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1044 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1045 The remaining arguments are optional.
1046 Delete the text if fourth arg DELETE is non-nil.
1048 Insert output in BUFFER before point; t means current buffer; nil for
1049 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1050 FILE)', where FILE is a file name string, means that it should be
1051 written to that file (if the file already exists it is overwritten).
1052 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1053 REAL-BUFFER says what to do with standard output, as above,
1054 while STDERR-FILE says what to do with standard error in the child.
1055 STDERR-FILE may be nil (discard standard error output),
1056 t (mix it with ordinary output), or a file name string.
1058 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1059 Remaining args are passed to PROGRAM at startup as command args.
1061 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1062 Otherwise it waits for PROGRAM to terminate
1063 and returns a numeric exit status or a signal description string.
1064 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1066 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1067 (ptrdiff_t nargs
, Lisp_Object
*args
)
1069 struct gcpro gcpro1
;
1070 Lisp_Object infile
, val
;
1071 ptrdiff_t count
= SPECPDL_INDEX ();
1072 Lisp_Object start
= args
[0];
1073 Lisp_Object end
= args
[1];
1077 if (STRINGP (start
))
1078 empty_input
= SCHARS (start
) == 0;
1079 else if (NILP (start
))
1080 empty_input
= BEG
== Z
;
1083 validate_region (&args
[0], &args
[1]);
1086 empty_input
= XINT (start
) == XINT (end
);
1090 fd
= create_temp_file (nargs
, args
, &infile
);
1094 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1096 report_file_error ("Opening null device", Qnil
);
1097 record_unwind_protect_int (close_file_unwind
, fd
);
1102 if (nargs
> 3 && !NILP (args
[3]))
1103 Fdelete_region (start
, end
);
1117 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1118 RETURN_UNGCPRO (unbind_to (count
, val
));
1122 static int relocate_fd (int fd
, int minfd
);
1126 add_env (char **env
, char **new_env
, char *string
)
1133 /* See if this string duplicates any string already in the env.
1134 If so, don't put it in.
1135 When an env var has multiple definitions,
1136 we keep the definition that comes first in process-environment. */
1137 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1139 char *p
= *ep
, *q
= string
;
1145 /* The string is a lone variable name; keep it for now, we
1146 will remove it later. It is a placeholder for a
1147 variable that is not to be included in the environment. */
1155 *new_env
++ = string
;
1159 /* This is the last thing run in a newly forked inferior
1160 either synchronous or asynchronous.
1161 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1162 Initialize inferior's priority, pgrp, connected dir and environment.
1163 then exec another program based on new_argv.
1165 If SET_PGRP, put the subprocess into a separate process group.
1167 CURRENT_DIR is an elisp string giving the path of the current
1168 directory the subprocess should have. Since we can't really signal
1169 a decent error from within the child, this should be verified as an
1170 executable directory by the parent. */
1173 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1174 Lisp_Object current_dir
)
1184 pid_t pid
= getpid ();
1185 #endif /* WINDOWSNT */
1187 /* Note that use of alloca is always safe here. It's obvious for systems
1188 that do not have true vfork or that have true (stack) alloca.
1189 If using vfork and C_ALLOCA (when Emacs used to include
1190 src/alloca.c) it is safe because that changes the superior's
1191 static variables as if the superior had done alloca and will be
1192 cleaned up in the usual way. */
1197 i
= SBYTES (current_dir
);
1199 /* MSDOS must have all environment variables malloc'ed, because
1200 low-level libc functions that launch subsidiary processes rely
1202 pwd_var
= xmalloc (i
+ 5);
1204 pwd_var
= alloca (i
+ 5);
1207 memcpy (pwd_var
, "PWD=", 4);
1208 strcpy (temp
, SSDATA (current_dir
));
1211 /* We can't signal an Elisp error here; we're in a vfork. Since
1212 the callers check the current directory before forking, this
1213 should only return an error if the directory's permissions
1214 are changed between the check and this chdir, but we should
1216 if (chdir (temp
) < 0)
1217 _exit (EXIT_CANCELED
);
1219 /* Get past the drive letter, so that d:/ is left alone. */
1220 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1227 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1228 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1232 /* Set `env' to a vector of the strings in the environment. */
1234 register Lisp_Object tem
;
1235 register char **new_env
;
1237 register int new_length
;
1238 Lisp_Object display
= Qnil
;
1242 for (tem
= Vprocess_environment
;
1243 CONSP (tem
) && STRINGP (XCAR (tem
));
1246 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1247 && (SDATA (XCAR (tem
)) [7] == '\0'
1248 || SDATA (XCAR (tem
)) [7] == '='))
1249 /* DISPLAY is specified in process-environment. */
1254 /* If not provided yet, use the frame's DISPLAY. */
1257 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1258 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1259 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1260 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1261 Vinitial_environment
);
1269 /* new_length + 2 to include PWD and terminating 0. */
1270 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1271 /* If we have a PWD envvar, pass one down,
1272 but with corrected value. */
1273 if (egetenv ("PWD"))
1274 *new_env
++ = pwd_var
;
1276 if (STRINGP (display
))
1278 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1279 strcpy (vdata
, "DISPLAY=");
1280 strcat (vdata
, SSDATA (display
));
1281 new_env
= add_env (env
, new_env
, vdata
);
1285 for (tem
= Vprocess_environment
;
1286 CONSP (tem
) && STRINGP (XCAR (tem
));
1288 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1292 /* Remove variable names without values. */
1296 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1306 prepare_standard_handles (in
, out
, err
, handles
);
1307 set_process_dir (SDATA (current_dir
));
1308 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1309 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1310 reset_standard_handles (in
, out
, err
, handles
);
1312 /* An error occurred while trying to spawn the process. */
1313 report_file_error ("Spawning child process", Qnil
);
1316 #else /* not WINDOWSNT */
1317 /* Make sure that in, out, and err are not actually already in
1318 descriptors zero, one, or two; this could happen if Emacs is
1319 started with its standard in, out, or error closed, as might
1322 int oin
= in
, oout
= out
;
1324 /* We have to avoid relocating the same descriptor twice! */
1326 in
= relocate_fd (in
, 3);
1331 out
= relocate_fd (out
, 3);
1335 else if (err
== oout
)
1338 err
= relocate_fd (err
, 3);
1342 /* Redirect file descriptors and clear the close-on-exec flag on the
1343 redirected ones. IN, OUT, and ERR are close-on-exec so they
1344 need not be closed explicitly. */
1352 execve (new_argv
[0], new_argv
, env
);
1355 /* Avoid deadlock if the child's perror writes to a full pipe; the
1356 pipe's reader is the parent, but with vfork the parent can't
1357 run until the child exits. Truncate the diagnostic instead. */
1358 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1361 emacs_perror (new_argv
[0]);
1362 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1365 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1368 /* An error occurred while trying to run the subprocess. */
1369 report_file_error ("Spawning child process", Qnil
);
1372 #endif /* not WINDOWSNT */
1376 /* Move the file descriptor FD so that its number is not less than MINFD.
1377 If the file descriptor is moved at all, the original is closed on MSDOS,
1378 but not elsewhere as the caller will close it anyway. */
1380 relocate_fd (int fd
, int minfd
)
1386 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1389 emacs_perror ("while setting up child");
1390 _exit (EXIT_CANCELED
);
1398 #endif /* not WINDOWSNT */
1401 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1402 ptrdiff_t *valuelen
, Lisp_Object env
)
1404 for (; CONSP (env
); env
= XCDR (env
))
1406 Lisp_Object entry
= XCAR (env
);
1408 && SBYTES (entry
) >= varlen
1410 /* NT environment variables are case insensitive. */
1411 && ! strnicmp (SDATA (entry
), var
, varlen
)
1412 #else /* not WINDOWSNT */
1413 && ! memcmp (SDATA (entry
), var
, varlen
)
1414 #endif /* not WINDOWSNT */
1417 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1419 *value
= SSDATA (entry
) + (varlen
+ 1);
1420 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1423 else if (SBYTES (entry
) == varlen
)
1425 /* Lone variable names in Vprocess_environment mean that
1426 variable should be removed from the environment. */
1436 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1437 ptrdiff_t *valuelen
, Lisp_Object frame
)
1439 /* Try to find VAR in Vprocess_environment first. */
1440 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1441 Vprocess_environment
))
1442 return *value
? 1 : 0;
1444 /* For DISPLAY try to get the values from the frame or the initial env. */
1445 if (strcmp (var
, "DISPLAY") == 0)
1448 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1449 if (STRINGP (display
))
1451 *value
= SSDATA (display
);
1452 *valuelen
= SBYTES (display
);
1455 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1456 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1457 Vinitial_environment
))
1458 return *value
? 1 : 0;
1464 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1465 doc
: /* Get the value of environment variable VARIABLE.
1466 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1467 the environment. Otherwise, value is a string.
1469 This function searches `process-environment' for VARIABLE.
1471 If optional parameter ENV is a list, then search this list instead of
1472 `process-environment', and return t when encountering a negative entry
1473 \(an entry for a variable with no value). */)
1474 (Lisp_Object variable
, Lisp_Object env
)
1479 CHECK_STRING (variable
);
1482 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1483 &value
, &valuelen
, env
))
1484 return value
? make_string (value
, valuelen
) : Qt
;
1488 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1489 &value
, &valuelen
, env
))
1490 return make_string (value
, valuelen
);
1495 /* A version of getenv that consults the Lisp environment lists,
1496 easily callable from C. */
1498 egetenv (const char *var
)
1503 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1510 /* This is run before init_cmdargs. */
1513 init_callproc_1 (void)
1516 const char *etc_dir
= ns_etc_directory ();
1517 const char *path_exec
= ns_exec_path ();
1520 Vdata_directory
= decode_env_path ("EMACSDATA",
1525 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1527 Vdoc_directory
= decode_env_path ("EMACSDOC",
1532 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1534 /* Check the EMACSPATH environment variable, defaulting to the
1535 PATH_EXEC path from epaths.h. */
1536 Vexec_path
= decode_env_path ("EMACSPATH",
1538 path_exec
? path_exec
:
1541 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1542 /* FIXME? For ns, path_exec should go at the front? */
1543 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1546 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1549 init_callproc (void)
1551 char *data_dir
= egetenv ("EMACSDATA");
1554 Lisp_Object tempdir
;
1558 const char *etc_dir
= ns_etc_directory ();
1561 data_dir
= alloca (strlen (etc_dir
) + 1);
1562 strcpy (data_dir
, etc_dir
);
1567 if (!NILP (Vinstallation_directory
))
1569 /* Add to the path the lib-src subdir of the installation dir. */
1571 tem
= Fexpand_file_name (build_string ("lib-src"),
1572 Vinstallation_directory
);
1574 /* MSDOS uses wrapped binaries, so don't do this. */
1575 if (NILP (Fmember (tem
, Vexec_path
)))
1578 const char *path_exec
= ns_exec_path ();
1580 Vexec_path
= decode_env_path ("EMACSPATH",
1582 path_exec
? path_exec
:
1585 Vexec_path
= Fcons (tem
, Vexec_path
);
1586 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1589 Vexec_directory
= Ffile_name_as_directory (tem
);
1590 #endif /* not MSDOS */
1592 /* Maybe use ../etc as well as ../lib-src. */
1595 tem
= Fexpand_file_name (build_string ("etc"),
1596 Vinstallation_directory
);
1597 Vdoc_directory
= Ffile_name_as_directory (tem
);
1601 /* Look for the files that should be in etc. We don't use
1602 Vinstallation_directory, because these files are never installed
1603 near the executable, and they are never in the build
1604 directory when that's different from the source directory.
1606 Instead, if these files are not in the nominal place, we try the
1607 source directory. */
1610 Lisp_Object tem
, tem1
, srcdir
;
1611 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1613 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1615 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1616 tem1
= Ffile_exists_p (tem
);
1617 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1620 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1621 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1622 tem1
= Ffile_exists_p (tem
);
1624 Vdata_directory
= newdir
;
1632 tempdir
= Fdirectory_file_name (Vexec_directory
);
1633 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1634 dir_warning ("arch-dependent data dir", Vexec_directory
);
1637 tempdir
= Fdirectory_file_name (Vdata_directory
);
1638 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1639 dir_warning ("arch-independent data dir", Vdata_directory
);
1641 sh
= getenv ("SHELL");
1642 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1645 Vshared_game_score_directory
= Qnil
;
1647 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1648 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1649 Vshared_game_score_directory
= Qnil
;
1654 set_initial_environment (void)
1657 for (envp
= environ
; *envp
; envp
++)
1658 Vprocess_environment
= Fcons (build_string (*envp
),
1659 Vprocess_environment
);
1660 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1661 to use `delete' and friends on process-environment. */
1662 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1666 syms_of_callproc (void)
1669 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1670 #elif defined (WINDOWSNT)
1671 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1673 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1675 staticpro (&Vtemp_file_name_pattern
);
1678 synch_process_tempfile
= make_number (0);
1679 staticpro (&synch_process_tempfile
);
1682 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1683 doc
: /* File name to load inferior shells from.
1684 Initialized from the SHELL environment variable, or to a system-dependent
1685 default if SHELL is not set. */);
1687 DEFVAR_LISP ("exec-path", Vexec_path
,
1688 doc
: /* List of directories to search programs to run in subprocesses.
1689 Each element is a string (directory name) or nil (try default directory). */);
1691 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1692 doc
: /* List of suffixes to try to find executable file names.
1693 Each element is a string. */);
1694 Vexec_suffixes
= Qnil
;
1696 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1697 doc
: /* Directory for executables for Emacs to invoke.
1698 More generally, this includes any architecture-dependent files
1699 that are built and installed from the Emacs distribution. */);
1701 DEFVAR_LISP ("data-directory", Vdata_directory
,
1702 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1703 These are files intended for Emacs to use while it runs. */);
1705 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1706 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1707 This is usually the same as `data-directory'. */);
1709 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1710 doc
: /* For internal use by the build procedure only.
1711 This is the name of the directory in which the build procedure installed
1712 Emacs's info files; the default value for `Info-default-directory-list'
1714 Vconfigure_info_directory
= build_string (PATH_INFO
);
1716 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1717 doc
: /* Directory of score files for games which come with GNU Emacs.
1718 If this variable is nil, then Emacs is unable to use a shared directory. */);
1720 Vshared_game_score_directory
= Qnil
;
1722 Vshared_game_score_directory
= build_string (PATH_GAME
);
1725 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1726 doc
: /* List of environment variables inherited from the parent process.
1727 Each element should be a string of the form ENVVARNAME=VALUE.
1728 The elements must normally be decoded (using `locale-coding-system') for use. */);
1729 Vinitial_environment
= Qnil
;
1731 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1732 doc
: /* List of overridden environment variables for subprocesses to inherit.
1733 Each element should be a string of the form ENVVARNAME=VALUE.
1735 Entries in this list take precedence to those in the frame-local
1736 environments. Therefore, let-binding `process-environment' is an easy
1737 way to temporarily change the value of an environment variable,
1738 irrespective of where it comes from. To use `process-environment' to
1739 remove an environment variable, include only its name in the list,
1742 This variable is set to nil when Emacs starts.
1744 If multiple entries define the same variable, the first one always
1747 Non-ASCII characters are encoded according to the initial value of
1748 `locale-coding-system', i.e. the elements must normally be decoded for
1751 See `setenv' and `getenv'. */);
1752 Vprocess_environment
= Qnil
;
1754 defsubr (&Scall_process
);
1755 defsubr (&Sgetenv_internal
);
1756 defsubr (&Scall_process_region
);