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);
113 block_child_signal (void)
116 sigemptyset (&blocked
);
117 sigaddset (&blocked
, SIGCHLD
);
118 pthread_sigmask (SIG_BLOCK
, &blocked
, 0);
121 /* Unblock SIGCHLD. */
124 unblock_child_signal (void)
126 pthread_sigmask (SIG_SETMASK
, &empty_mask
, 0);
131 /* Return the current buffer's working directory, or the home
132 directory if it's unreachable, as a string suitable for a system call.
133 Signal an error if the result would not be an accessible directory. */
136 encode_current_directory (void)
141 dir
= BVAR (current_buffer
, directory
);
144 dir
= Funhandled_file_name_directory (dir
);
146 /* If the file name handler says that dir is unreachable, use
147 a sensible default. */
149 dir
= build_string ("~");
151 dir
= expand_and_dir_to_file (dir
, Qnil
);
153 if (STRING_MULTIBYTE (dir
))
154 dir
= ENCODE_FILE (dir
);
155 if (NILP (Ffile_accessible_directory_p (dir
)))
156 report_file_error ("Setting current directory",
157 BVAR (current_buffer
, directory
));
159 /* Remove "/:" from dir. */
160 if (Fstring_match (build_string ("^/:"), dir
, Qnil
))
161 dir
= Fsubstring (dir
, make_number (2), Qnil
);
163 RETURN_UNGCPRO (dir
);
166 /* If P is reapable, record it as a deleted process and kill it.
167 Do this in a critical section. Unless PID is wedged it will be
168 reaped on receipt of the first SIGCHLD after the critical section. */
171 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
174 block_child_signal ();
178 record_deleted_pid (p
->pid
, tempfile
);
180 kill (- p
->pid
, SIGKILL
);
183 unblock_child_signal ();
187 /* Clean up files, file descriptors and processes created by Fcall_process. */
190 delete_temp_file (Lisp_Object name
)
192 unlink (SSDATA (name
));
196 call_process_kill (void *ptr
)
198 int *callproc_fd
= ptr
;
200 for (i
= 0; i
< CALLPROC_FDS
; i
++)
201 if (0 <= callproc_fd
[i
])
202 emacs_close (callproc_fd
[i
]);
204 if (synch_process_pid
)
206 struct Lisp_Process proc
;
208 proc
.pid
= synch_process_pid
;
209 record_kill_process (&proc
, synch_process_tempfile
);
210 synch_process_pid
= 0;
212 else if (STRINGP (synch_process_tempfile
))
213 delete_temp_file (synch_process_tempfile
);
216 /* Clean up when exiting Fcall_process: restore the buffer, and
217 kill the subsidiary process group if the process still exists. */
220 call_process_cleanup (Lisp_Object buffer
)
222 Fset_buffer (buffer
);
225 if (synch_process_pid
)
227 kill (-synch_process_pid
, SIGINT
);
228 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
231 wait_for_termination (synch_process_pid
, 0, 1);
232 synch_process_pid
= 0;
234 message1 ("Waiting for process to die...done");
240 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
242 static mode_t
const default_output_mode
= 0666;
245 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
246 doc
: /* Call PROGRAM synchronously in separate process.
247 The remaining arguments are optional.
248 The program's input comes from file INFILE (nil means `/dev/null').
249 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
250 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
251 FILE is a file name string, means that it should be written to that file
252 \(if the file already exists it is overwritten).
253 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
254 REAL-BUFFER says what to do with standard output, as above,
255 while STDERR-FILE says what to do with standard error in the child.
256 STDERR-FILE may be nil (discard standard error output),
257 t (mix it with ordinary output), or a file name string.
259 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
260 Remaining arguments are strings passed as command arguments to PROGRAM.
262 If executable PROGRAM can't be found as an executable, `call-process'
263 signals a Lisp error. `call-process' reports errors in execution of
264 the program only through its return and output.
266 If DESTINATION is 0, `call-process' returns immediately with value nil.
267 Otherwise it waits for PROGRAM to terminate
268 and returns a numeric exit status or a signal description string.
269 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
271 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
272 (ptrdiff_t nargs
, Lisp_Object
*args
)
274 Lisp_Object infile
, encoded_infile
;
277 ptrdiff_t count
= SPECPDL_INDEX ();
279 if (nargs
>= 2 && ! NILP (args
[1]))
281 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
282 CHECK_STRING (infile
);
285 infile
= build_string (NULL_DEVICE
);
288 encoded_infile
= STRING_MULTIBYTE (infile
) ? ENCODE_FILE (infile
) : infile
;
290 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
292 report_file_error ("Opening process input file", infile
);
293 record_unwind_protect_int (close_file_unwind
, filefd
);
295 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
298 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
300 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
301 unwinder that is intended to remove the input temporary file; in
302 this case NARGS must be at least 2 and ARGS[1] is the file's name.
304 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
307 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
308 ptrdiff_t tempfile_index
)
310 Lisp_Object buffer
, current_dir
, path
;
313 int callproc_fd
[CALLPROC_FDS
];
316 ptrdiff_t count
= SPECPDL_INDEX ();
320 /* File to use for stderr in the child.
321 t means use same as standard output. */
322 Lisp_Object error_file
;
323 Lisp_Object output_file
= Qnil
;
324 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
325 char *tempfile
= NULL
;
331 int fd_output
, fd_error
;
332 struct coding_system process_coding
; /* coding-system of process output */
333 struct coding_system argument_coding
; /* coding-system of arguments */
334 /* Set to the return value of Ffind_operation_coding_system. */
335 Lisp_Object coding_systems
;
338 if (synch_process_pid
)
339 error ("call-process invoked recursively");
341 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
344 CHECK_STRING (args
[0]);
349 /* Without asynchronous processes we cannot have BUFFER == 0. */
351 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
352 error ("Operating system cannot handle asynchronous subprocesses");
353 #endif /* subprocesses */
355 /* Decide the coding-system for giving arguments. */
357 Lisp_Object val
, *args2
;
359 /* If arguments are supplied, we may have to encode them. */
362 bool must_encode
= 0;
363 Lisp_Object coding_attrs
;
365 for (i
= 4; i
< nargs
; i
++)
366 CHECK_STRING (args
[i
]);
368 for (i
= 4; i
< nargs
; i
++)
369 if (STRING_MULTIBYTE (args
[i
]))
372 if (!NILP (Vcoding_system_for_write
))
373 val
= Vcoding_system_for_write
;
374 else if (! must_encode
)
378 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
379 args2
[0] = Qcall_process
;
380 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
381 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
382 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
384 val
= complement_process_encoding_system (val
);
385 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
386 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
387 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
389 /* We should not use an ASCII incompatible coding system. */
390 val
= raw_text_coding_system (val
);
391 setup_coding_system (val
, &argument_coding
);
402 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
403 FILE-FOR-STDERR), unless the first element is :file, in which case see
404 the next paragraph. */
405 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
407 if (CONSP (XCDR (buffer
)))
409 Lisp_Object stderr_file
;
410 stderr_file
= XCAR (XCDR (buffer
));
412 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
413 error_file
= stderr_file
;
415 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
418 buffer
= XCAR (buffer
);
421 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
422 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
424 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
425 BVAR (current_buffer
, directory
));
426 CHECK_STRING (output_file
);
430 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
432 Lisp_Object spec_buffer
;
433 spec_buffer
= buffer
;
434 buffer
= Fget_buffer_create (buffer
);
435 /* Mention the buffer name for a better error message. */
437 CHECK_BUFFER (spec_buffer
);
438 CHECK_BUFFER (buffer
);
442 /* Make sure that the child will be able to chdir to the current
443 buffer's current directory, or its unhandled equivalent. We
444 can't just have the child check for an error when it does the
445 chdir, since it's in a vfork.
447 We have to GCPRO around this because Fexpand_file_name,
448 Funhandled_file_name_directory, and Ffile_accessible_directory_p
449 might call a file name handling function. The argument list is
450 protected by the caller, so all we really have to worry about is
453 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
455 current_dir
= encode_current_directory ();
457 GCPRO4 (buffer
, current_dir
, error_file
, output_file
);
459 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
460 error_file
= ENCODE_FILE (error_file
);
461 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
462 output_file
= ENCODE_FILE (output_file
);
466 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
468 for (i
= 0; i
< CALLPROC_FDS
; i
++)
471 synch_process_tempfile
= make_number (0);
473 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
475 /* Search for program; barf if not found. */
477 struct gcpro gcpro1
, gcpro2
, gcpro3
;
480 GCPRO3 (buffer
, current_dir
, error_file
);
481 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
,
482 make_number (X_OK
), false);
485 report_file_error ("Searching for program", args
[0]);
488 /* If program file name starts with /: for quoting a magic name,
490 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
491 && SREF (path
, 1) == ':')
492 path
= Fsubstring (path
, make_number (2), Qnil
);
494 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
497 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
499 GCPRO4 (buffer
, current_dir
, path
, error_file
);
504 argument_coding
.dst_multibyte
= 0;
505 for (i
= 4; i
< nargs
; i
++)
507 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
508 if (CODING_REQUIRE_ENCODING (&argument_coding
))
509 /* We must encode this argument. */
510 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
512 for (i
= 4; i
< nargs
; i
++)
513 new_argv
[i
- 3] = SSDATA (args
[i
]);
518 if (STRING_MULTIBYTE (path
))
519 path
= ENCODE_FILE (path
);
520 new_argv
[0] = SSDATA (path
);
524 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
527 if (! discard_output
&& ! STRINGP (output_file
))
529 char const *tmpdir
= egetenv ("TMPDIR");
530 char const *outf
= tmpdir
? tmpdir
: "";
531 tempfile
= alloca (strlen (outf
) + 20);
532 strcpy (tempfile
, outf
);
533 dostounix_filename (tempfile
);
534 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
535 strcat (tempfile
, "/");
536 strcat (tempfile
, "emXXXXXX");
539 report_file_error ("Opening process output file", Qnil
);
540 output_file
= build_string (tempfile
);
541 synch_process_tempfile
= output_file
;
547 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
549 report_file_error ("Opening null device", Qnil
);
551 else if (STRINGP (output_file
))
553 fd_output
= emacs_open (SSDATA (output_file
),
554 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
555 default_output_mode
);
558 int open_errno
= errno
;
559 output_file
= DECODE_FILE (output_file
);
560 report_file_errno ("Opening process output file",
561 output_file
, open_errno
);
567 if (emacs_pipe (fd
) != 0)
568 report_file_error ("Creating process pipe", Qnil
);
569 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
572 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
574 fd_error
= fd_output
;
576 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
578 fd_error
= emacs_open ((STRINGP (error_file
)
579 ? SSDATA (error_file
)
581 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
582 default_output_mode
);
585 int open_errno
= errno
;
586 report_file_errno ("Cannot redirect stderr",
587 (STRINGP (error_file
)
588 ? DECODE_FILE (error_file
)
589 : build_string (NULL_DEVICE
)),
592 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
595 #ifdef MSDOS /* MW, July 1993 */
596 /* Note that on MSDOS `child_setup' actually returns the child process
597 exit status, not its PID, so assign it to status below. */
598 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
603 unbind_to (count
, Qnil
);
604 synchronize_system_messages_locale ();
606 code_convert_string_norecord (build_string (strerror (child_errno
)),
607 Vlocale_coding_system
, 0);
611 for (i
= 0; i
< CALLPROC_FDS
; i
++)
612 if (0 <= callproc_fd
[i
])
614 emacs_close (callproc_fd
[i
]);
617 emacs_close (filefd
);
618 clear_unwind_protect (count
- 1);
622 /* Since CRLF is converted to LF within `decode_coding', we
623 can always open a file with binary mode. */
624 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
625 O_RDONLY
| O_BINARY
, 0);
626 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
628 int open_errno
= errno
;
629 report_file_errno ("Cannot re-open temporary file",
630 build_string (tempfile
), open_errno
);
636 /* Do the unwind-protect now, even though the pid is not known, so
637 that no storage allocation is done in the critical section.
638 The actual PID will be filled in during the critical section. */
639 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
644 block_child_signal ();
647 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
648 #else /* not WINDOWSNT */
650 /* vfork, and prevent local vars from being clobbered by the vfork. */
652 Lisp_Object
volatile buffer_volatile
= buffer
;
653 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
654 Lisp_Object
volatile current_dir_volatile
= current_dir
;
655 bool volatile display_p_volatile
= display_p
;
656 bool volatile sa_must_free_volatile
= sa_must_free
;
657 int volatile fd_error_volatile
= fd_error
;
658 int volatile filefd_volatile
= filefd
;
659 ptrdiff_t volatile count_volatile
= count
;
660 ptrdiff_t volatile sa_count_volatile
= sa_count
;
661 char **volatile new_argv_volatile
= new_argv
;
662 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
663 for (i
= 0; i
< CALLPROC_FDS
; i
++)
664 callproc_fd_volatile
[i
] = callproc_fd
[i
];
668 buffer
= buffer_volatile
;
669 coding_systems
= coding_systems_volatile
;
670 current_dir
= current_dir_volatile
;
671 display_p
= display_p_volatile
;
672 sa_must_free
= sa_must_free_volatile
;
673 fd_error
= fd_error_volatile
;
674 filefd
= filefd_volatile
;
675 count
= count_volatile
;
676 sa_count
= sa_count_volatile
;
677 new_argv
= new_argv_volatile
;
679 for (i
= 0; i
< CALLPROC_FDS
; i
++)
680 callproc_fd
[i
] = callproc_fd_volatile
[i
];
681 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
686 unblock_child_signal ();
690 /* Emacs ignores SIGPIPE, but the child should not. */
691 signal (SIGPIPE
, SIG_DFL
);
692 /* Likewise for SIGPROF. */
694 signal (SIGPROF
, SIG_DFL
);
697 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
700 #endif /* not WINDOWSNT */
706 synch_process_pid
= pid
;
708 if (INTEGERP (buffer
))
710 if (tempfile_index
< 0)
711 record_deleted_pid (pid
, Qnil
);
715 record_deleted_pid (pid
, args
[1]);
716 clear_unwind_protect (tempfile_index
);
718 synch_process_pid
= 0;
722 unblock_child_signal ();
726 report_file_errno ("Doing vfork", Qnil
, child_errno
);
728 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
729 since we will use that to read input from. */
730 for (i
= 0; i
< CALLPROC_FDS
; i
++)
731 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
733 emacs_close (callproc_fd
[i
]);
736 emacs_close (filefd
);
737 clear_unwind_protect (count
- 1);
739 #endif /* not MSDOS */
741 if (INTEGERP (buffer
))
742 return unbind_to (count
, Qnil
);
744 if (BUFFERP (buffer
))
745 Fset_buffer (buffer
);
747 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
751 Lisp_Object val
, *args2
;
754 if (!NILP (Vcoding_system_for_read
))
755 val
= Vcoding_system_for_read
;
758 if (EQ (coding_systems
, Qt
))
762 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
763 args2
[0] = Qcall_process
;
764 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
766 = Ffind_operation_coding_system (nargs
+ 1, args2
);
768 if (CONSP (coding_systems
))
769 val
= XCAR (coding_systems
);
770 else if (CONSP (Vdefault_process_coding_system
))
771 val
= XCAR (Vdefault_process_coding_system
);
775 Fcheck_coding_system (val
);
776 /* In unibyte mode, character code conversion should not take
777 place but EOL conversion should. So, setup raw-text or one
778 of the subsidiary according to the information just setup. */
779 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
781 val
= raw_text_coding_system (val
);
782 setup_coding_system (val
, &process_coding
);
783 process_coding
.dst_multibyte
784 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
785 process_coding
.src_multibyte
= 0;
793 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
794 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
795 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
796 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
798 EMACS_INT total_read
= 0;
800 bool display_on_the_fly
= display_p
;
801 struct coding_system saved_coding
= process_coding
;
805 /* Repeatedly read until we've filled as much as possible
806 of the buffer size we have. But don't read
807 less than 1024--save that for the next bufferful. */
809 while (nread
< bufsize
- 1024)
811 int this_read
= emacs_read (fd0
, buf
+ nread
,
819 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
824 total_read
+= this_read
;
826 if (display_on_the_fly
)
830 /* Now NREAD is the total amount of data in the buffer. */
835 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
836 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
837 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
839 { /* We have to decode the input. */
841 ptrdiff_t count1
= SPECPDL_INDEX ();
843 XSETBUFFER (curbuf
, current_buffer
);
844 /* FIXME: Call signal_after_change! */
845 prepare_to_modify_buffer (PT
, PT
, NULL
);
846 /* We cannot allow after-change-functions be run
847 during decoding, because that might modify the
848 buffer, while we rely on process_coding.produced to
849 faithfully reflect inserted text until we
850 TEMP_SET_PT_BOTH below. */
851 specbind (Qinhibit_modification_hooks
, Qt
);
852 decode_coding_c_string (&process_coding
,
853 (unsigned char *) buf
, nread
, curbuf
);
854 unbind_to (count1
, Qnil
);
855 if (display_on_the_fly
856 && CODING_REQUIRE_DETECTION (&saved_coding
)
857 && ! CODING_REQUIRE_DETECTION (&process_coding
))
859 /* We have detected some coding system, but the
860 detection may have been via insufficient data.
861 So give up displaying on the fly. */
862 if (process_coding
.produced
> 0)
863 del_range_2 (process_coding
.dst_pos
,
864 process_coding
.dst_pos_byte
,
865 (process_coding
.dst_pos
866 + process_coding
.produced_char
),
867 (process_coding
.dst_pos_byte
868 + process_coding
.produced
),
870 display_on_the_fly
= 0;
871 process_coding
= saved_coding
;
873 /* Make the above condition always fail in the future. */
874 saved_coding
.common_flags
875 &= ~CODING_REQUIRE_DETECTION_MASK
;
879 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
880 PT_BYTE
+ process_coding
.produced
);
881 carryover
= process_coding
.carryover_bytes
;
883 memcpy (buf
, process_coding
.carryover
,
884 process_coding
.carryover_bytes
);
887 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
890 /* Make the buffer bigger as we continue to read more data,
891 but not past CALLPROC_BUFFER_SIZE_MAX. */
892 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
893 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
894 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
898 redisplay_preserve_echo_area (1);
899 /* This variable might have been set to 0 for code
900 detection. In that case, set it back to 1 because
901 we should have already detected a coding system. */
902 display_on_the_fly
= 1;
909 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
910 /* If the caller required, let the buffer inherit the
911 coding-system used to decode the process output. */
912 if (inherit_process_coding_system
)
913 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
914 make_number (total_read
));
918 /* Wait for it to terminate, unless it already has. */
919 wait_for_termination (pid
, &status
, fd0
< 0);
924 /* Don't kill any children that the subprocess may have left behind
926 synch_process_pid
= 0;
929 unbind_to (count
, Qnil
);
931 if (WIFSIGNALED (status
))
935 synchronize_system_messages_locale ();
936 signame
= strsignal (WTERMSIG (status
));
941 return code_convert_string_norecord (build_string (signame
),
942 Vlocale_coding_system
, 0);
945 eassert (WIFEXITED (status
));
946 return make_number (WEXITSTATUS (status
));
949 /* Create a temporary file suitable for storing the input data of
950 call-process-region. NARGS and ARGS are the same as for
951 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
952 naming the file, and return a file descriptor for reading.
953 Unwind-protect the file, so that the file descriptor will be closed
954 and the file removed when the caller unwinds the specpdl stack. */
957 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
958 Lisp_Object
*filename_string_ptr
)
962 Lisp_Object filename_string
;
963 Lisp_Object val
, start
, end
;
966 if (STRINGP (Vtemporary_file_directory
))
967 tmpdir
= Vtemporary_file_directory
;
972 outf
= getenv ("TMPDIR");
973 tmpdir
= build_string (outf
? outf
: "/tmp/");
975 if ((outf
= egetenv ("TMPDIR"))
976 || (outf
= egetenv ("TMP"))
977 || (outf
= egetenv ("TEMP")))
978 tmpdir
= build_string (outf
);
980 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
985 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
990 /* Cannot use the result of Fexpand_file_name, because it
991 downcases the XXXXXX part of the pattern, and mktemp then
992 doesn't recognize it. */
993 if (!NILP (Vw32_downcase_file_names
))
995 Lisp_Object dirname
= Ffile_name_directory (pattern
);
998 pattern
= Vtemp_file_name_pattern
;
1000 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
1004 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
1005 GCPRO1 (filename_string
);
1006 tempfile
= SSDATA (filename_string
);
1008 count
= SPECPDL_INDEX ();
1009 record_unwind_protect_nothing ();
1010 fd
= mkostemp (tempfile
, O_CLOEXEC
);
1012 report_file_error ("Failed to open temporary file using pattern",
1014 set_unwind_protect (count
, delete_temp_file
, filename_string
);
1015 record_unwind_protect_int (close_file_unwind
, fd
);
1020 /* Decide coding-system of the contents of the temporary file. */
1021 if (!NILP (Vcoding_system_for_write
))
1022 val
= Vcoding_system_for_write
;
1023 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1027 Lisp_Object coding_systems
;
1030 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1031 args2
[0] = Qcall_process_region
;
1032 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1033 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1034 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1037 val
= complement_process_encoding_system (val
);
1040 ptrdiff_t count1
= SPECPDL_INDEX ();
1042 specbind (intern ("coding-system-for-write"), val
);
1043 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1044 happen to get a ".Z" suffix. */
1045 specbind (intern ("file-name-handler-alist"), Qnil
);
1046 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1048 unbind_to (count1
, Qnil
);
1051 if (lseek (fd
, 0, SEEK_SET
) < 0)
1052 report_file_error ("Setting file position", filename_string
);
1054 /* Note that Fcall_process takes care of binding
1055 coding-system-for-read. */
1057 *filename_string_ptr
= filename_string
;
1062 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1064 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1065 The remaining arguments are optional.
1066 Delete the text if fourth arg DELETE is non-nil.
1068 Insert output in BUFFER before point; t means current buffer; nil for
1069 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1070 FILE)', where FILE is a file name string, means that it should be
1071 written to that file (if the file already exists it is overwritten).
1072 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1073 REAL-BUFFER says what to do with standard output, as above,
1074 while STDERR-FILE says what to do with standard error in the child.
1075 STDERR-FILE may be nil (discard standard error output),
1076 t (mix it with ordinary output), or a file name string.
1078 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1079 Remaining args are passed to PROGRAM at startup as command args.
1081 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1082 Otherwise it waits for PROGRAM to terminate
1083 and returns a numeric exit status or a signal description string.
1084 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1086 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1087 (ptrdiff_t nargs
, Lisp_Object
*args
)
1089 struct gcpro gcpro1
;
1090 Lisp_Object infile
, val
;
1091 ptrdiff_t count
= SPECPDL_INDEX ();
1092 Lisp_Object start
= args
[0];
1093 Lisp_Object end
= args
[1];
1097 if (STRINGP (start
))
1098 empty_input
= SCHARS (start
) == 0;
1099 else if (NILP (start
))
1100 empty_input
= BEG
== Z
;
1103 validate_region (&args
[0], &args
[1]);
1106 empty_input
= XINT (start
) == XINT (end
);
1110 fd
= create_temp_file (nargs
, args
, &infile
);
1114 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1116 report_file_error ("Opening null device", Qnil
);
1117 record_unwind_protect_int (close_file_unwind
, fd
);
1122 if (nargs
> 3 && !NILP (args
[3]))
1123 Fdelete_region (start
, end
);
1137 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1138 RETURN_UNGCPRO (unbind_to (count
, val
));
1142 static int relocate_fd (int fd
, int minfd
);
1146 add_env (char **env
, char **new_env
, char *string
)
1153 /* See if this string duplicates any string already in the env.
1154 If so, don't put it in.
1155 When an env var has multiple definitions,
1156 we keep the definition that comes first in process-environment. */
1157 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1159 char *p
= *ep
, *q
= string
;
1165 /* The string is a lone variable name; keep it for now, we
1166 will remove it later. It is a placeholder for a
1167 variable that is not to be included in the environment. */
1175 *new_env
++ = string
;
1179 /* This is the last thing run in a newly forked inferior
1180 either synchronous or asynchronous.
1181 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1182 Initialize inferior's priority, pgrp, connected dir and environment.
1183 then exec another program based on new_argv.
1185 If SET_PGRP, put the subprocess into a separate process group.
1187 CURRENT_DIR is an elisp string giving the path of the current
1188 directory the subprocess should have. Since we can't really signal
1189 a decent error from within the child, this should be verified as an
1190 executable directory by the parent. */
1193 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1194 Lisp_Object current_dir
)
1204 pid_t pid
= getpid ();
1205 #endif /* WINDOWSNT */
1207 /* Note that use of alloca is always safe here. It's obvious for systems
1208 that do not have true vfork or that have true (stack) alloca.
1209 If using vfork and C_ALLOCA (when Emacs used to include
1210 src/alloca.c) it is safe because that changes the superior's
1211 static variables as if the superior had done alloca and will be
1212 cleaned up in the usual way. */
1217 i
= SBYTES (current_dir
);
1219 /* MSDOS must have all environment variables malloc'ed, because
1220 low-level libc functions that launch subsidiary processes rely
1222 pwd_var
= xmalloc (i
+ 5);
1224 pwd_var
= alloca (i
+ 5);
1227 memcpy (pwd_var
, "PWD=", 4);
1228 strcpy (temp
, SSDATA (current_dir
));
1231 /* We can't signal an Elisp error here; we're in a vfork. Since
1232 the callers check the current directory before forking, this
1233 should only return an error if the directory's permissions
1234 are changed between the check and this chdir, but we should
1236 if (chdir (temp
) < 0)
1237 _exit (EXIT_CANCELED
);
1239 /* Get past the drive letter, so that d:/ is left alone. */
1240 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1247 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1248 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1252 /* Set `env' to a vector of the strings in the environment. */
1254 register Lisp_Object tem
;
1255 register char **new_env
;
1257 register int new_length
;
1258 Lisp_Object display
= Qnil
;
1262 for (tem
= Vprocess_environment
;
1263 CONSP (tem
) && STRINGP (XCAR (tem
));
1266 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1267 && (SDATA (XCAR (tem
)) [7] == '\0'
1268 || SDATA (XCAR (tem
)) [7] == '='))
1269 /* DISPLAY is specified in process-environment. */
1274 /* If not provided yet, use the frame's DISPLAY. */
1277 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1278 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1279 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1280 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1281 Vinitial_environment
);
1289 /* new_length + 2 to include PWD and terminating 0. */
1290 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1291 /* If we have a PWD envvar, pass one down,
1292 but with corrected value. */
1293 if (egetenv ("PWD"))
1294 *new_env
++ = pwd_var
;
1296 if (STRINGP (display
))
1298 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1299 strcpy (vdata
, "DISPLAY=");
1300 strcat (vdata
, SSDATA (display
));
1301 new_env
= add_env (env
, new_env
, vdata
);
1305 for (tem
= Vprocess_environment
;
1306 CONSP (tem
) && STRINGP (XCAR (tem
));
1308 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1312 /* Remove variable names without values. */
1316 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1326 prepare_standard_handles (in
, out
, err
, handles
);
1327 set_process_dir (SDATA (current_dir
));
1328 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1329 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1330 reset_standard_handles (in
, out
, err
, handles
);
1332 /* An error occurred while trying to spawn the process. */
1333 report_file_error ("Spawning child process", Qnil
);
1336 #else /* not WINDOWSNT */
1337 /* Make sure that in, out, and err are not actually already in
1338 descriptors zero, one, or two; this could happen if Emacs is
1339 started with its standard in, out, or error closed, as might
1342 int oin
= in
, oout
= out
;
1344 /* We have to avoid relocating the same descriptor twice! */
1346 in
= relocate_fd (in
, 3);
1351 out
= relocate_fd (out
, 3);
1355 else if (err
== oout
)
1358 err
= relocate_fd (err
, 3);
1362 /* Redirect file descriptors and clear the close-on-exec flag on the
1363 redirected ones. IN, OUT, and ERR are close-on-exec so they
1364 need not be closed explicitly. */
1372 execve (new_argv
[0], new_argv
, env
);
1375 /* Avoid deadlock if the child's perror writes to a full pipe; the
1376 pipe's reader is the parent, but with vfork the parent can't
1377 run until the child exits. Truncate the diagnostic instead. */
1378 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1381 emacs_perror (new_argv
[0]);
1382 _exit (exec_errno
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1385 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1388 /* An error occurred while trying to run the subprocess. */
1389 report_file_error ("Spawning child process", Qnil
);
1392 #endif /* not WINDOWSNT */
1396 /* Move the file descriptor FD so that its number is not less than MINFD.
1397 If the file descriptor is moved at all, the original is closed on MSDOS,
1398 but not elsewhere as the caller will close it anyway. */
1400 relocate_fd (int fd
, int minfd
)
1406 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1409 emacs_perror ("while setting up child");
1410 _exit (EXIT_CANCELED
);
1418 #endif /* not WINDOWSNT */
1421 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1422 ptrdiff_t *valuelen
, Lisp_Object env
)
1424 for (; CONSP (env
); env
= XCDR (env
))
1426 Lisp_Object entry
= XCAR (env
);
1428 && SBYTES (entry
) >= varlen
1430 /* NT environment variables are case insensitive. */
1431 && ! strnicmp (SDATA (entry
), var
, varlen
)
1432 #else /* not WINDOWSNT */
1433 && ! memcmp (SDATA (entry
), var
, varlen
)
1434 #endif /* not WINDOWSNT */
1437 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1439 *value
= SSDATA (entry
) + (varlen
+ 1);
1440 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1443 else if (SBYTES (entry
) == varlen
)
1445 /* Lone variable names in Vprocess_environment mean that
1446 variable should be removed from the environment. */
1456 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1457 ptrdiff_t *valuelen
, Lisp_Object frame
)
1459 /* Try to find VAR in Vprocess_environment first. */
1460 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1461 Vprocess_environment
))
1462 return *value
? 1 : 0;
1464 /* For DISPLAY try to get the values from the frame or the initial env. */
1465 if (strcmp (var
, "DISPLAY") == 0)
1468 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1469 if (STRINGP (display
))
1471 *value
= SSDATA (display
);
1472 *valuelen
= SBYTES (display
);
1475 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1476 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1477 Vinitial_environment
))
1478 return *value
? 1 : 0;
1484 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1485 doc
: /* Get the value of environment variable VARIABLE.
1486 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1487 the environment. Otherwise, value is a string.
1489 This function searches `process-environment' for VARIABLE.
1491 If optional parameter ENV is a list, then search this list instead of
1492 `process-environment', and return t when encountering a negative entry
1493 \(an entry for a variable with no value). */)
1494 (Lisp_Object variable
, Lisp_Object env
)
1499 CHECK_STRING (variable
);
1502 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1503 &value
, &valuelen
, env
))
1504 return value
? make_string (value
, valuelen
) : Qt
;
1508 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1509 &value
, &valuelen
, env
))
1510 return make_string (value
, valuelen
);
1515 /* A version of getenv that consults the Lisp environment lists,
1516 easily callable from C. */
1518 egetenv (const char *var
)
1523 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1530 /* This is run before init_cmdargs. */
1533 init_callproc_1 (void)
1536 const char *etc_dir
= ns_etc_directory ();
1537 const char *path_exec
= ns_exec_path ();
1540 Vdata_directory
= decode_env_path ("EMACSDATA",
1545 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1547 Vdoc_directory
= decode_env_path ("EMACSDOC",
1552 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1554 /* Check the EMACSPATH environment variable, defaulting to the
1555 PATH_EXEC path from epaths.h. */
1556 Vexec_path
= decode_env_path ("EMACSPATH",
1558 path_exec
? path_exec
:
1561 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1562 /* FIXME? For ns, path_exec should go at the front? */
1563 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1566 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1569 init_callproc (void)
1571 char *data_dir
= egetenv ("EMACSDATA");
1574 Lisp_Object tempdir
;
1578 const char *etc_dir
= ns_etc_directory ();
1581 data_dir
= alloca (strlen (etc_dir
) + 1);
1582 strcpy (data_dir
, etc_dir
);
1587 if (!NILP (Vinstallation_directory
))
1589 /* Add to the path the lib-src subdir of the installation dir. */
1591 tem
= Fexpand_file_name (build_string ("lib-src"),
1592 Vinstallation_directory
);
1594 /* MSDOS uses wrapped binaries, so don't do this. */
1595 if (NILP (Fmember (tem
, Vexec_path
)))
1598 const char *path_exec
= ns_exec_path ();
1600 Vexec_path
= decode_env_path ("EMACSPATH",
1602 path_exec
? path_exec
:
1605 Vexec_path
= Fcons (tem
, Vexec_path
);
1606 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1609 Vexec_directory
= Ffile_name_as_directory (tem
);
1610 #endif /* not MSDOS */
1612 /* Maybe use ../etc as well as ../lib-src. */
1615 tem
= Fexpand_file_name (build_string ("etc"),
1616 Vinstallation_directory
);
1617 Vdoc_directory
= Ffile_name_as_directory (tem
);
1621 /* Look for the files that should be in etc. We don't use
1622 Vinstallation_directory, because these files are never installed
1623 near the executable, and they are never in the build
1624 directory when that's different from the source directory.
1626 Instead, if these files are not in the nominal place, we try the
1627 source directory. */
1630 Lisp_Object tem
, tem1
, srcdir
;
1631 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1633 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1635 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1636 tem1
= Ffile_exists_p (tem
);
1637 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1640 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1641 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1642 tem1
= Ffile_exists_p (tem
);
1644 Vdata_directory
= newdir
;
1652 tempdir
= Fdirectory_file_name (Vexec_directory
);
1653 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1654 dir_warning ("arch-dependent data dir", Vexec_directory
);
1657 tempdir
= Fdirectory_file_name (Vdata_directory
);
1658 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1659 dir_warning ("arch-independent data dir", Vdata_directory
);
1661 sh
= getenv ("SHELL");
1662 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1665 Vshared_game_score_directory
= Qnil
;
1667 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1668 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1669 Vshared_game_score_directory
= Qnil
;
1674 set_initial_environment (void)
1677 for (envp
= environ
; *envp
; envp
++)
1678 Vprocess_environment
= Fcons (build_string (*envp
),
1679 Vprocess_environment
);
1680 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1681 to use `delete' and friends on process-environment. */
1682 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1686 syms_of_callproc (void)
1689 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1691 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1693 staticpro (&Vtemp_file_name_pattern
);
1696 synch_process_tempfile
= make_number (0);
1697 staticpro (&synch_process_tempfile
);
1700 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1701 doc
: /* File name to load inferior shells from.
1702 Initialized from the SHELL environment variable, or to a system-dependent
1703 default if SHELL is not set. */);
1705 DEFVAR_LISP ("exec-path", Vexec_path
,
1706 doc
: /* List of directories to search programs to run in subprocesses.
1707 Each element is a string (directory name) or nil (try default directory).
1709 By default the last element of this list is `exec-directory'. The
1710 last element is not always used, for example in shell completion
1711 (`shell-dynamic-complete-command'). */);
1713 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1714 doc
: /* List of suffixes to try to find executable file names.
1715 Each element is a string. */);
1716 Vexec_suffixes
= Qnil
;
1718 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1719 doc
: /* Directory for executables for Emacs to invoke.
1720 More generally, this includes any architecture-dependent files
1721 that are built and installed from the Emacs distribution. */);
1723 DEFVAR_LISP ("data-directory", Vdata_directory
,
1724 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1725 These are files intended for Emacs to use while it runs. */);
1727 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1728 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1729 This is usually the same as `data-directory'. */);
1731 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1732 doc
: /* For internal use by the build procedure only.
1733 This is the name of the directory in which the build procedure installed
1734 Emacs's info files; the default value for `Info-default-directory-list'
1736 Vconfigure_info_directory
= build_string (PATH_INFO
);
1738 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1739 doc
: /* Directory of score files for games which come with GNU Emacs.
1740 If this variable is nil, then Emacs is unable to use a shared directory. */);
1742 Vshared_game_score_directory
= Qnil
;
1744 Vshared_game_score_directory
= build_string (PATH_GAME
);
1747 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1748 doc
: /* List of environment variables inherited from the parent process.
1749 Each element should be a string of the form ENVVARNAME=VALUE.
1750 The elements must normally be decoded (using `locale-coding-system') for use. */);
1751 Vinitial_environment
= Qnil
;
1753 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1754 doc
: /* List of overridden environment variables for subprocesses to inherit.
1755 Each element should be a string of the form ENVVARNAME=VALUE.
1757 Entries in this list take precedence to those in the frame-local
1758 environments. Therefore, let-binding `process-environment' is an easy
1759 way to temporarily change the value of an environment variable,
1760 irrespective of where it comes from. To use `process-environment' to
1761 remove an environment variable, include only its name in the list,
1764 This variable is set to nil when Emacs starts.
1766 If multiple entries define the same variable, the first one always
1769 Non-ASCII characters are encoded according to the initial value of
1770 `locale-coding-system', i.e. the elements must normally be decoded for
1773 See `setenv' and `getenv'. */);
1774 Vprocess_environment
= Qnil
;
1776 defsubr (&Scall_process
);
1777 defsubr (&Sgetenv_internal
);
1778 defsubr (&Scall_process_region
);