1 /* Synchronous subprocess invocation for GNU Emacs.
3 Copyright (C) 1985-1988, 1993-1995, 1999-2014 Free Software Foundation,
6 This file is part of GNU Emacs.
8 GNU Emacs is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 GNU Emacs is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
25 #include <sys/types.h>
35 #include <sys/socket.h> /* for fcntl */
38 #define _P_NOWAIT 1 /* from process.h */
41 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
43 #include <sys/param.h>
47 #include "character.h"
51 #include "composite.h"
54 #include "syssignal.h"
57 #include "blockinput.h"
59 #include "termhooks.h"
69 /* Pattern used by call-process-region to make temp files. */
70 static Lisp_Object Vtemp_file_name_pattern
;
72 /* The next two variables are used while record-unwind-protect is in place
73 during call-process for a subprocess for which record_deleted_pid has
74 not yet been called. At other times, synch_process_pid is zero and
75 synch_process_tempfile's contents are irrelevant. Doing this via static
76 C variables is more convenient than putting them into the arguments
77 of record-unwind-protect, as they need to be updated at randomish
78 times in the code, and Lisp cannot always store these values as
79 Emacs integers. It's safe to use static variables here, as the
80 code is never invoked reentrantly. */
82 /* If nonzero, a process-ID that has not been reaped. */
83 static pid_t synch_process_pid
;
85 /* If a string, the name of a temp file that has not been removed. */
87 static Lisp_Object synch_process_tempfile
;
89 # define synch_process_tempfile make_number (0)
92 /* Indexes of file descriptors that need closing on call_process_kill. */
95 /* The subsidiary process's stdout and stderr. stdin is handled
96 separately, in either Fcall_process_region or create_temp_file. */
97 CALLPROC_STDOUT
, CALLPROC_STDERR
,
99 /* How to read from a pipe (or substitute) from the subsidiary process. */
102 /* A bound on the number of file descriptors. */
106 static Lisp_Object
call_process (ptrdiff_t, Lisp_Object
*, int, ptrdiff_t);
108 /* Return the current buffer's working directory, or the home
109 directory if it's unreachable, as a string suitable for a system call.
110 Signal an error if the result would not be an accessible directory. */
113 encode_current_directory (void)
118 dir
= BVAR (current_buffer
, directory
);
121 dir
= Funhandled_file_name_directory (dir
);
123 /* If the file name handler says that dir is unreachable, use
124 a sensible default. */
126 dir
= build_string ("~");
128 dir
= expand_and_dir_to_file (dir
, Qnil
);
130 if (STRING_MULTIBYTE (dir
))
131 dir
= ENCODE_FILE (dir
);
132 if (! file_accessible_directory_p (dir
))
133 report_file_error ("Setting current directory",
134 BVAR (current_buffer
, directory
));
136 RETURN_UNGCPRO (dir
);
139 /* If P is reapable, record it as a deleted process and kill it.
140 Do this in a critical section. Unless PID is wedged it will be
141 reaped on receipt of the first SIGCHLD after the critical section. */
144 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
148 block_child_signal (&oldset
);
152 record_deleted_pid (p
->pid
, tempfile
);
154 kill (- p
->pid
, SIGKILL
);
157 unblock_child_signal (&oldset
);
161 /* Clean up files, file descriptors and processes created by Fcall_process. */
164 delete_temp_file (Lisp_Object name
)
166 unlink (SSDATA (name
));
170 call_process_kill (void *ptr
)
172 int *callproc_fd
= ptr
;
174 for (i
= 0; i
< CALLPROC_FDS
; i
++)
175 if (0 <= callproc_fd
[i
])
176 emacs_close (callproc_fd
[i
]);
178 if (synch_process_pid
)
180 struct Lisp_Process proc
;
182 proc
.pid
= synch_process_pid
;
183 record_kill_process (&proc
, synch_process_tempfile
);
184 synch_process_pid
= 0;
186 else if (STRINGP (synch_process_tempfile
))
187 delete_temp_file (synch_process_tempfile
);
190 /* Clean up when exiting Fcall_process: restore the buffer, and
191 kill the subsidiary process group if the process still exists. */
194 call_process_cleanup (Lisp_Object buffer
)
196 Fset_buffer (buffer
);
199 if (synch_process_pid
)
201 kill (-synch_process_pid
, SIGINT
);
202 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
205 wait_for_termination (synch_process_pid
, 0, 1);
206 synch_process_pid
= 0;
208 message1 ("Waiting for process to die...done");
214 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
216 static mode_t
const default_output_mode
= 0666;
219 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
220 doc
: /* Call PROGRAM synchronously in separate process.
221 The remaining arguments are optional.
222 The program's input comes from file INFILE (nil means `/dev/null').
223 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
224 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
225 FILE is a file name string, means that it should be written to that file
226 \(if the file already exists it is overwritten).
227 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
228 REAL-BUFFER says what to do with standard output, as above,
229 while STDERR-FILE says what to do with standard error in the child.
230 STDERR-FILE may be nil (discard standard error output),
231 t (mix it with ordinary output), or a file name string.
233 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
234 Remaining arguments are strings passed as command arguments to PROGRAM.
236 If executable PROGRAM can't be found as an executable, `call-process'
237 signals a Lisp error. `call-process' reports errors in execution of
238 the program only through its return and output.
240 If DESTINATION is 0, `call-process' returns immediately with value nil.
241 Otherwise it waits for PROGRAM to terminate
242 and returns a numeric exit status or a signal description string.
243 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
245 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
246 (ptrdiff_t nargs
, Lisp_Object
*args
)
248 Lisp_Object infile
, encoded_infile
;
251 ptrdiff_t count
= SPECPDL_INDEX ();
253 if (nargs
>= 2 && ! NILP (args
[1]))
255 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
256 CHECK_STRING (infile
);
259 infile
= build_string (NULL_DEVICE
);
262 encoded_infile
= STRING_MULTIBYTE (infile
) ? ENCODE_FILE (infile
) : infile
;
264 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
266 report_file_error ("Opening process input file", infile
);
267 record_unwind_protect_int (close_file_unwind
, filefd
);
269 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
272 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
274 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
275 unwinder that is intended to remove the input temporary file; in
276 this case NARGS must be at least 2 and ARGS[1] is the file's name.
278 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
281 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
282 ptrdiff_t tempfile_index
)
284 Lisp_Object buffer
, current_dir
, path
;
287 int callproc_fd
[CALLPROC_FDS
];
290 ptrdiff_t count
= SPECPDL_INDEX ();
294 /* File to use for stderr in the child.
295 t means use same as standard output. */
296 Lisp_Object error_file
;
297 Lisp_Object output_file
= Qnil
;
298 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
299 char *tempfile
= NULL
;
306 int fd_output
, fd_error
;
307 struct coding_system process_coding
; /* coding-system of process output */
308 struct coding_system argument_coding
; /* coding-system of arguments */
309 /* Set to the return value of Ffind_operation_coding_system. */
310 Lisp_Object coding_systems
;
313 if (synch_process_pid
)
314 error ("call-process invoked recursively");
316 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
319 CHECK_STRING (args
[0]);
324 /* Without asynchronous processes we cannot have BUFFER == 0. */
326 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
327 error ("Operating system cannot handle asynchronous subprocesses");
328 #endif /* subprocesses */
330 /* Decide the coding-system for giving arguments. */
332 Lisp_Object val
, *args2
;
334 /* If arguments are supplied, we may have to encode them. */
337 bool must_encode
= 0;
338 Lisp_Object coding_attrs
;
340 for (i
= 4; i
< nargs
; i
++)
341 CHECK_STRING (args
[i
]);
343 for (i
= 4; i
< nargs
; i
++)
344 if (STRING_MULTIBYTE (args
[i
]))
347 if (!NILP (Vcoding_system_for_write
))
348 val
= Vcoding_system_for_write
;
349 else if (! must_encode
)
353 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
354 args2
[0] = Qcall_process
;
355 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
356 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
357 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
359 val
= complement_process_encoding_system (val
);
360 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
361 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
362 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
364 /* We should not use an ASCII incompatible coding system. */
365 val
= raw_text_coding_system (val
);
366 setup_coding_system (val
, &argument_coding
);
377 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
378 FILE-FOR-STDERR), unless the first element is :file, in which case see
379 the next paragraph. */
380 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
382 if (CONSP (XCDR (buffer
)))
384 Lisp_Object stderr_file
;
385 stderr_file
= XCAR (XCDR (buffer
));
387 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
388 error_file
= stderr_file
;
390 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
393 buffer
= XCAR (buffer
);
396 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
397 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
399 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
400 BVAR (current_buffer
, directory
));
401 CHECK_STRING (output_file
);
405 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
407 Lisp_Object spec_buffer
;
408 spec_buffer
= buffer
;
409 buffer
= Fget_buffer_create (buffer
);
410 /* Mention the buffer name for a better error message. */
412 CHECK_BUFFER (spec_buffer
);
413 CHECK_BUFFER (buffer
);
417 /* Make sure that the child will be able to chdir to the current
418 buffer's current directory, or its unhandled equivalent. We
419 can't just have the child check for an error when it does the
420 chdir, since it's in a vfork.
422 We have to GCPRO around this because Fexpand_file_name,
423 Funhandled_file_name_directory, and Ffile_accessible_directory_p
424 might call a file name handling function. The argument list is
425 protected by the caller, so all we really have to worry about is
428 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
430 current_dir
= encode_current_directory ();
432 GCPRO4 (buffer
, current_dir
, error_file
, output_file
);
434 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
435 error_file
= ENCODE_FILE (error_file
);
436 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
437 output_file
= ENCODE_FILE (output_file
);
441 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
443 for (i
= 0; i
< CALLPROC_FDS
; i
++)
446 synch_process_tempfile
= make_number (0);
448 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
450 /* Search for program; barf if not found. */
452 struct gcpro gcpro1
, gcpro2
, gcpro3
;
455 GCPRO3 (buffer
, current_dir
, error_file
);
456 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
,
457 make_number (X_OK
), false);
460 report_file_error ("Searching for program", args
[0]);
463 /* If program file name starts with /: for quoting a magic name,
465 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
466 && SREF (path
, 1) == ':')
467 path
= Fsubstring (path
, make_number (2), Qnil
);
469 SAFE_NALLOCA (new_argv
, 1, nargs
< 4 ? 2 : nargs
- 2);
472 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
474 GCPRO4 (buffer
, current_dir
, path
, error_file
);
479 argument_coding
.dst_multibyte
= 0;
480 for (i
= 4; i
< nargs
; i
++)
482 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
483 if (CODING_REQUIRE_ENCODING (&argument_coding
))
484 /* We must encode this argument. */
485 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
487 for (i
= 4; i
< nargs
; i
++)
488 new_argv
[i
- 3] = SSDATA (args
[i
]);
493 if (STRING_MULTIBYTE (path
))
494 path
= ENCODE_FILE (path
);
495 new_argv
[0] = SSDATA (path
);
499 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
502 if (! discard_output
&& ! STRINGP (output_file
))
504 char const *tmpdir
= egetenv ("TMPDIR");
505 char const *outf
= tmpdir
? tmpdir
: "";
506 tempfile
= alloca (strlen (outf
) + 20);
507 strcpy (tempfile
, outf
);
508 dostounix_filename (tempfile
);
509 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
510 strcat (tempfile
, "/");
511 strcat (tempfile
, "emXXXXXX");
514 report_file_error ("Opening process output file", Qnil
);
515 output_file
= build_string (tempfile
);
516 synch_process_tempfile
= output_file
;
522 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
524 report_file_error ("Opening null device", Qnil
);
526 else if (STRINGP (output_file
))
528 fd_output
= emacs_open (SSDATA (output_file
),
529 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
530 default_output_mode
);
533 int open_errno
= errno
;
534 output_file
= DECODE_FILE (output_file
);
535 report_file_errno ("Opening process output file",
536 output_file
, open_errno
);
542 if (emacs_pipe (fd
) != 0)
543 report_file_error ("Creating process pipe", Qnil
);
544 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
547 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
549 fd_error
= fd_output
;
551 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
553 fd_error
= emacs_open ((STRINGP (error_file
)
554 ? SSDATA (error_file
)
556 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
557 default_output_mode
);
560 int open_errno
= errno
;
561 report_file_errno ("Cannot redirect stderr",
562 (STRINGP (error_file
)
563 ? DECODE_FILE (error_file
)
564 : build_string (NULL_DEVICE
)),
567 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
570 #ifdef MSDOS /* MW, July 1993 */
571 /* Note that on MSDOS `child_setup' actually returns the child process
572 exit status, not its PID, so assign it to status below. */
573 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
578 unbind_to (count
, Qnil
);
579 synchronize_system_messages_locale ();
581 code_convert_string_norecord (build_string (strerror (child_errno
)),
582 Vlocale_coding_system
, 0);
586 for (i
= 0; i
< CALLPROC_FDS
; i
++)
587 if (0 <= callproc_fd
[i
])
589 emacs_close (callproc_fd
[i
]);
592 emacs_close (filefd
);
593 clear_unwind_protect (count
- 1);
597 /* Since CRLF is converted to LF within `decode_coding', we
598 can always open a file with binary mode. */
599 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
,
600 O_RDONLY
| O_BINARY
, 0);
601 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
603 int open_errno
= errno
;
604 report_file_errno ("Cannot re-open temporary file",
605 build_string (tempfile
), open_errno
);
611 /* Do the unwind-protect now, even though the pid is not known, so
612 that no storage allocation is done in the critical section.
613 The actual PID will be filled in during the critical section. */
614 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
619 block_child_signal (&oldset
);
622 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
623 #else /* not WINDOWSNT */
625 /* vfork, and prevent local vars from being clobbered by the vfork. */
627 Lisp_Object
volatile buffer_volatile
= buffer
;
628 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
629 Lisp_Object
volatile current_dir_volatile
= current_dir
;
630 bool volatile display_p_volatile
= display_p
;
631 bool volatile sa_must_free_volatile
= sa_must_free
;
632 int volatile fd_error_volatile
= fd_error
;
633 int volatile filefd_volatile
= filefd
;
634 ptrdiff_t volatile count_volatile
= count
;
635 ptrdiff_t volatile sa_count_volatile
= sa_count
;
636 char **volatile new_argv_volatile
= new_argv
;
637 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
638 for (i
= 0; i
< CALLPROC_FDS
; i
++)
639 callproc_fd_volatile
[i
] = callproc_fd
[i
];
643 buffer
= buffer_volatile
;
644 coding_systems
= coding_systems_volatile
;
645 current_dir
= current_dir_volatile
;
646 display_p
= display_p_volatile
;
647 sa_must_free
= sa_must_free_volatile
;
648 fd_error
= fd_error_volatile
;
649 filefd
= filefd_volatile
;
650 count
= count_volatile
;
651 sa_count
= sa_count_volatile
;
652 new_argv
= new_argv_volatile
;
654 for (i
= 0; i
< CALLPROC_FDS
; i
++)
655 callproc_fd
[i
] = callproc_fd_volatile
[i
];
656 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
661 unblock_child_signal (&oldset
);
665 /* Emacs ignores SIGPIPE, but the child should not. */
666 signal (SIGPIPE
, SIG_DFL
);
667 /* Likewise for SIGPROF. */
669 signal (SIGPROF
, SIG_DFL
);
672 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
675 #endif /* not WINDOWSNT */
681 synch_process_pid
= pid
;
683 if (INTEGERP (buffer
))
685 if (tempfile_index
< 0)
686 record_deleted_pid (pid
, Qnil
);
690 record_deleted_pid (pid
, args
[1]);
691 clear_unwind_protect (tempfile_index
);
693 synch_process_pid
= 0;
697 unblock_child_signal (&oldset
);
701 report_file_errno ("Doing vfork", Qnil
, child_errno
);
703 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
704 since we will use that to read input from. */
705 for (i
= 0; i
< CALLPROC_FDS
; i
++)
706 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
708 emacs_close (callproc_fd
[i
]);
711 emacs_close (filefd
);
712 clear_unwind_protect (count
- 1);
714 #endif /* not MSDOS */
716 if (INTEGERP (buffer
))
717 return unbind_to (count
, Qnil
);
719 if (BUFFERP (buffer
))
720 Fset_buffer (buffer
);
722 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
726 Lisp_Object val
, *args2
;
729 if (!NILP (Vcoding_system_for_read
))
730 val
= Vcoding_system_for_read
;
733 if (EQ (coding_systems
, Qt
))
737 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
738 args2
[0] = Qcall_process
;
739 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
741 = Ffind_operation_coding_system (nargs
+ 1, args2
);
743 if (CONSP (coding_systems
))
744 val
= XCAR (coding_systems
);
745 else if (CONSP (Vdefault_process_coding_system
))
746 val
= XCAR (Vdefault_process_coding_system
);
750 Fcheck_coding_system (val
);
751 /* In unibyte mode, character code conversion should not take
752 place but EOL conversion should. So, setup raw-text or one
753 of the subsidiary according to the information just setup. */
754 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
756 val
= raw_text_coding_system (val
);
757 setup_coding_system (val
, &process_coding
);
758 process_coding
.dst_multibyte
759 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
760 process_coding
.src_multibyte
= 0;
768 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
769 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
770 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
771 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
773 EMACS_INT total_read
= 0;
775 bool display_on_the_fly
= display_p
;
776 struct coding_system saved_coding
= process_coding
;
780 /* Repeatedly read until we've filled as much as possible
781 of the buffer size we have. But don't read
782 less than 1024--save that for the next bufferful. */
784 while (nread
< bufsize
- 1024)
786 int this_read
= emacs_read (fd0
, buf
+ nread
,
794 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
799 total_read
+= this_read
;
801 if (display_on_the_fly
)
805 /* Now NREAD is the total amount of data in the buffer. */
810 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
811 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
812 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
814 { /* We have to decode the input. */
816 ptrdiff_t count1
= SPECPDL_INDEX ();
818 XSETBUFFER (curbuf
, current_buffer
);
819 /* FIXME: Call signal_after_change! */
820 prepare_to_modify_buffer (PT
, PT
, NULL
);
821 /* We cannot allow after-change-functions be run
822 during decoding, because that might modify the
823 buffer, while we rely on process_coding.produced to
824 faithfully reflect inserted text until we
825 TEMP_SET_PT_BOTH below. */
826 specbind (Qinhibit_modification_hooks
, Qt
);
827 decode_coding_c_string (&process_coding
,
828 (unsigned char *) buf
, nread
, curbuf
);
829 unbind_to (count1
, Qnil
);
830 if (display_on_the_fly
831 && CODING_REQUIRE_DETECTION (&saved_coding
)
832 && ! CODING_REQUIRE_DETECTION (&process_coding
))
834 /* We have detected some coding system, but the
835 detection may have been via insufficient data.
836 So give up displaying on the fly. */
837 if (process_coding
.produced
> 0)
838 del_range_2 (process_coding
.dst_pos
,
839 process_coding
.dst_pos_byte
,
840 (process_coding
.dst_pos
841 + process_coding
.produced_char
),
842 (process_coding
.dst_pos_byte
843 + process_coding
.produced
),
845 display_on_the_fly
= 0;
846 process_coding
= saved_coding
;
848 /* Make the above condition always fail in the future. */
849 saved_coding
.common_flags
850 &= ~CODING_REQUIRE_DETECTION_MASK
;
854 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
855 PT_BYTE
+ process_coding
.produced
);
856 carryover
= process_coding
.carryover_bytes
;
858 memcpy (buf
, process_coding
.carryover
,
859 process_coding
.carryover_bytes
);
862 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
865 /* Make the buffer bigger as we continue to read more data,
866 but not past CALLPROC_BUFFER_SIZE_MAX. */
867 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
868 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
869 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
873 redisplay_preserve_echo_area (1);
874 /* This variable might have been set to 0 for code
875 detection. In that case, set it back to 1 because
876 we should have already detected a coding system. */
877 display_on_the_fly
= 1;
884 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
885 /* If the caller required, let the buffer inherit the
886 coding-system used to decode the process output. */
887 if (inherit_process_coding_system
)
888 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
889 make_number (total_read
));
893 /* Wait for it to terminate, unless it already has. */
894 wait_for_termination (pid
, &status
, fd0
< 0);
899 /* Don't kill any children that the subprocess may have left behind
901 synch_process_pid
= 0;
904 unbind_to (count
, Qnil
);
906 if (WIFSIGNALED (status
))
910 synchronize_system_messages_locale ();
911 signame
= strsignal (WTERMSIG (status
));
916 return code_convert_string_norecord (build_string (signame
),
917 Vlocale_coding_system
, 0);
920 eassert (WIFEXITED (status
));
921 return make_number (WEXITSTATUS (status
));
924 /* Create a temporary file suitable for storing the input data of
925 call-process-region. NARGS and ARGS are the same as for
926 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
927 naming the file, and return a file descriptor for reading.
928 Unwind-protect the file, so that the file descriptor will be closed
929 and the file removed when the caller unwinds the specpdl stack. */
932 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
933 Lisp_Object
*filename_string_ptr
)
937 Lisp_Object filename_string
;
938 Lisp_Object val
, start
, end
;
941 if (STRINGP (Vtemporary_file_directory
))
942 tmpdir
= Vtemporary_file_directory
;
947 outf
= getenv ("TMPDIR");
948 tmpdir
= build_string (outf
? outf
: "/tmp/");
950 if ((outf
= egetenv ("TMPDIR"))
951 || (outf
= egetenv ("TMP"))
952 || (outf
= egetenv ("TEMP")))
953 tmpdir
= build_string (outf
);
955 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
960 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
965 /* Cannot use the result of Fexpand_file_name, because it
966 downcases the XXXXXX part of the pattern, and mktemp then
967 doesn't recognize it. */
968 if (!NILP (Vw32_downcase_file_names
))
970 Lisp_Object dirname
= Ffile_name_directory (pattern
);
973 pattern
= Vtemp_file_name_pattern
;
975 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
979 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
980 GCPRO1 (filename_string
);
981 tempfile
= SSDATA (filename_string
);
983 count
= SPECPDL_INDEX ();
984 record_unwind_protect_nothing ();
985 fd
= mkostemp (tempfile
, O_BINARY
| O_CLOEXEC
);
987 report_file_error ("Failed to open temporary file using pattern",
989 set_unwind_protect (count
, delete_temp_file
, filename_string
);
990 record_unwind_protect_int (close_file_unwind
, fd
);
995 /* Decide coding-system of the contents of the temporary file. */
996 if (!NILP (Vcoding_system_for_write
))
997 val
= Vcoding_system_for_write
;
998 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1002 Lisp_Object coding_systems
;
1005 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1006 args2
[0] = Qcall_process_region
;
1007 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
1008 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1009 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1012 val
= complement_process_encoding_system (val
);
1015 ptrdiff_t count1
= SPECPDL_INDEX ();
1017 specbind (intern ("coding-system-for-write"), val
);
1018 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1019 happen to get a ".Z" suffix. */
1020 specbind (intern ("file-name-handler-alist"), Qnil
);
1021 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
1023 unbind_to (count1
, Qnil
);
1026 if (lseek (fd
, 0, SEEK_SET
) < 0)
1027 report_file_error ("Setting file position", filename_string
);
1029 /* Note that Fcall_process takes care of binding
1030 coding-system-for-read. */
1032 *filename_string_ptr
= filename_string
;
1037 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
1039 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
1040 The remaining arguments are optional.
1041 Delete the text if fourth arg DELETE is non-nil.
1043 Insert output in BUFFER before point; t means current buffer; nil for
1044 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1045 FILE)', where FILE is a file name string, means that it should be
1046 written to that file (if the file already exists it is overwritten).
1047 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1048 REAL-BUFFER says what to do with standard output, as above,
1049 while STDERR-FILE says what to do with standard error in the child.
1050 STDERR-FILE may be nil (discard standard error output),
1051 t (mix it with ordinary output), or a file name string.
1053 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1054 Remaining args are passed to PROGRAM at startup as command args.
1056 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1057 Otherwise it waits for PROGRAM to terminate
1058 and returns a numeric exit status or a signal description string.
1059 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1061 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1062 (ptrdiff_t nargs
, Lisp_Object
*args
)
1064 struct gcpro gcpro1
;
1065 Lisp_Object infile
, val
;
1066 ptrdiff_t count
= SPECPDL_INDEX ();
1067 Lisp_Object start
= args
[0];
1068 Lisp_Object end
= args
[1];
1072 if (STRINGP (start
))
1073 empty_input
= SCHARS (start
) == 0;
1074 else if (NILP (start
))
1075 empty_input
= BEG
== Z
;
1078 validate_region (&args
[0], &args
[1]);
1081 empty_input
= XINT (start
) == XINT (end
);
1085 fd
= create_temp_file (nargs
, args
, &infile
);
1089 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1091 report_file_error ("Opening null device", Qnil
);
1092 record_unwind_protect_int (close_file_unwind
, fd
);
1097 if (nargs
> 3 && !NILP (args
[3]))
1098 Fdelete_region (start
, end
);
1112 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1113 RETURN_UNGCPRO (unbind_to (count
, val
));
1117 static int relocate_fd (int fd
, int minfd
);
1121 add_env (char **env
, char **new_env
, char *string
)
1128 /* See if this string duplicates any string already in the env.
1129 If so, don't put it in.
1130 When an env var has multiple definitions,
1131 we keep the definition that comes first in process-environment. */
1132 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1134 char *p
= *ep
, *q
= string
;
1140 /* The string is a lone variable name; keep it for now, we
1141 will remove it later. It is a placeholder for a
1142 variable that is not to be included in the environment. */
1150 *new_env
++ = string
;
1156 /* 'exec' failed inside a child running NAME, with error number ERR.
1157 Possibly a vforked child needed to allocate a large vector on the
1158 stack; such a child cannot fall back on malloc because that might
1159 mess up the allocator's data structures in the parent.
1160 Report the error and exit the child. */
1162 static _Noreturn
void
1163 exec_failed (char const *name
, int err
)
1165 /* Avoid deadlock if the child's perror writes to a full pipe; the
1166 pipe's reader is the parent, but with vfork the parent can't
1167 run until the child exits. Truncate the diagnostic instead. */
1168 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1171 emacs_perror (name
);
1172 _exit (err
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1177 /* Do nothing. There is no need to fail, as DOS_NT platforms do not
1178 fork and exec, and handle alloca exhaustion in a different way. */
1181 exec_failed (char const *name
, int err
)
1187 /* This is the last thing run in a newly forked inferior
1188 either synchronous or asynchronous.
1189 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1190 Initialize inferior's priority, pgrp, connected dir and environment.
1191 then exec another program based on new_argv.
1193 If SET_PGRP, put the subprocess into a separate process group.
1195 CURRENT_DIR is an elisp string giving the path of the current
1196 directory the subprocess should have. Since we can't really signal
1197 a decent error from within the child, this should be verified as an
1198 executable directory by the parent. */
1201 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1202 Lisp_Object current_dir
)
1210 pid_t pid
= getpid ();
1211 #endif /* WINDOWSNT */
1213 /* Note that use of alloca is always safe here. It's obvious for systems
1214 that do not have true vfork or that have true (stack) alloca.
1215 If using vfork and C_ALLOCA (when Emacs used to include
1216 src/alloca.c) it is safe because that changes the superior's
1217 static variables as if the superior had done alloca and will be
1218 cleaned up in the usual way. */
1223 i
= SBYTES (current_dir
);
1225 /* MSDOS must have all environment variables malloc'ed, because
1226 low-level libc functions that launch subsidiary processes rely
1228 pwd_var
= xmalloc (i
+ 5);
1230 if (MAX_ALLOCA
- 5 < i
)
1231 exec_failed (new_argv
[0], ENOMEM
);
1232 pwd_var
= alloca (i
+ 5);
1235 memcpy (pwd_var
, "PWD=", 4);
1236 strcpy (temp
, SSDATA (current_dir
));
1239 /* We can't signal an Elisp error here; we're in a vfork. Since
1240 the callers check the current directory before forking, this
1241 should only return an error if the directory's permissions
1242 are changed between the check and this chdir, but we should
1244 if (chdir (temp
) < 0)
1245 _exit (EXIT_CANCELED
);
1247 /* Get past the drive letter, so that d:/ is left alone. */
1248 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1255 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1256 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1260 /* Set `env' to a vector of the strings in the environment. */
1262 register Lisp_Object tem
;
1263 register char **new_env
;
1265 register int new_length
;
1266 Lisp_Object display
= Qnil
;
1270 for (tem
= Vprocess_environment
;
1271 CONSP (tem
) && STRINGP (XCAR (tem
));
1274 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1275 && (SDATA (XCAR (tem
)) [7] == '\0'
1276 || SDATA (XCAR (tem
)) [7] == '='))
1277 /* DISPLAY is specified in process-environment. */
1282 /* If not provided yet, use the frame's DISPLAY. */
1285 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1286 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1287 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1288 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1289 Vinitial_environment
);
1297 /* new_length + 2 to include PWD and terminating 0. */
1298 if (MAX_ALLOCA
/ sizeof *env
- 2 < new_length
)
1299 exec_failed (new_argv
[0], ENOMEM
);
1300 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1301 /* If we have a PWD envvar, pass one down,
1302 but with corrected value. */
1303 if (egetenv ("PWD"))
1304 *new_env
++ = pwd_var
;
1306 if (STRINGP (display
))
1310 if (MAX_ALLOCA
- sizeof "DISPLAY=" < SBYTES (display
))
1311 exec_failed (new_argv
[0], ENOMEM
);
1312 vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1313 strcpy (vdata
, "DISPLAY=");
1314 strcat (vdata
, SSDATA (display
));
1315 new_env
= add_env (env
, new_env
, vdata
);
1319 for (tem
= Vprocess_environment
;
1320 CONSP (tem
) && STRINGP (XCAR (tem
));
1322 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1326 /* Remove variable names without values. */
1330 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1340 prepare_standard_handles (in
, out
, err
, handles
);
1341 set_process_dir (SDATA (current_dir
));
1342 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1343 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1344 reset_standard_handles (in
, out
, err
, handles
);
1346 /* An error occurred while trying to spawn the process. */
1347 report_file_error ("Spawning child process", Qnil
);
1350 #else /* not WINDOWSNT */
1351 /* Make sure that in, out, and err are not actually already in
1352 descriptors zero, one, or two; this could happen if Emacs is
1353 started with its standard in, out, or error closed, as might
1356 int oin
= in
, oout
= out
;
1358 /* We have to avoid relocating the same descriptor twice! */
1360 in
= relocate_fd (in
, 3);
1365 out
= relocate_fd (out
, 3);
1369 else if (err
== oout
)
1372 err
= relocate_fd (err
, 3);
1376 /* Redirect file descriptors and clear the close-on-exec flag on the
1377 redirected ones. IN, OUT, and ERR are close-on-exec so they
1378 need not be closed explicitly. */
1386 execve (new_argv
[0], new_argv
, env
);
1387 exec_failed (new_argv
[0], errno
);
1390 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1393 /* An error occurred while trying to run the subprocess. */
1394 report_file_error ("Spawning child process", Qnil
);
1397 #endif /* not WINDOWSNT */
1401 /* Move the file descriptor FD so that its number is not less than MINFD.
1402 If the file descriptor is moved at all, the original is closed on MSDOS,
1403 but not elsewhere as the caller will close it anyway. */
1405 relocate_fd (int fd
, int minfd
)
1411 int new = fcntl (fd
, F_DUPFD_CLOEXEC
, minfd
);
1414 emacs_perror ("while setting up child");
1415 _exit (EXIT_CANCELED
);
1423 #endif /* not WINDOWSNT */
1426 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1427 ptrdiff_t *valuelen
, Lisp_Object env
)
1429 for (; CONSP (env
); env
= XCDR (env
))
1431 Lisp_Object entry
= XCAR (env
);
1433 && SBYTES (entry
) >= varlen
1435 /* NT environment variables are case insensitive. */
1436 && ! strnicmp (SDATA (entry
), var
, varlen
)
1437 #else /* not WINDOWSNT */
1438 && ! memcmp (SDATA (entry
), var
, varlen
)
1439 #endif /* not WINDOWSNT */
1442 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1444 *value
= SSDATA (entry
) + (varlen
+ 1);
1445 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1448 else if (SBYTES (entry
) == varlen
)
1450 /* Lone variable names in Vprocess_environment mean that
1451 variable should be removed from the environment. */
1461 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1462 ptrdiff_t *valuelen
, Lisp_Object frame
)
1464 /* Try to find VAR in Vprocess_environment first. */
1465 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1466 Vprocess_environment
))
1467 return *value
? 1 : 0;
1469 /* For DISPLAY try to get the values from the frame or the initial env. */
1470 if (strcmp (var
, "DISPLAY") == 0)
1473 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1474 if (STRINGP (display
))
1476 *value
= SSDATA (display
);
1477 *valuelen
= SBYTES (display
);
1480 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1481 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1482 Vinitial_environment
))
1483 return *value
? 1 : 0;
1489 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1490 doc
: /* Get the value of environment variable VARIABLE.
1491 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1492 the environment. Otherwise, value is a string.
1494 This function searches `process-environment' for VARIABLE.
1496 If optional parameter ENV is a list, then search this list instead of
1497 `process-environment', and return t when encountering a negative entry
1498 \(an entry for a variable with no value). */)
1499 (Lisp_Object variable
, Lisp_Object env
)
1504 CHECK_STRING (variable
);
1507 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1508 &value
, &valuelen
, env
))
1509 return value
? make_string (value
, valuelen
) : Qt
;
1513 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1514 &value
, &valuelen
, env
))
1515 return make_string (value
, valuelen
);
1520 /* A version of getenv that consults the Lisp environment lists,
1521 easily callable from C. This is usually called from egetenv. */
1523 egetenv_internal (const char *var
, ptrdiff_t len
)
1528 if (getenv_internal (var
, len
, &value
, &valuelen
, Qnil
))
1535 /* This is run before init_cmdargs. */
1538 init_callproc_1 (void)
1541 const char *etc_dir
= ns_etc_directory ();
1542 const char *path_exec
= ns_exec_path ();
1545 Vdata_directory
= decode_env_path ("EMACSDATA",
1550 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1552 Vdoc_directory
= decode_env_path ("EMACSDOC",
1557 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1559 /* Check the EMACSPATH environment variable, defaulting to the
1560 PATH_EXEC path from epaths.h. */
1561 Vexec_path
= decode_env_path ("EMACSPATH",
1563 path_exec
? path_exec
:
1566 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1567 /* FIXME? For ns, path_exec should go at the front? */
1568 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1571 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1574 init_callproc (void)
1576 bool data_dir
= egetenv ("EMACSDATA") != 0;
1579 Lisp_Object tempdir
;
1582 data_dir
= ns_etc_directory () != 0;
1585 if (!NILP (Vinstallation_directory
))
1587 /* Add to the path the lib-src subdir of the installation dir. */
1589 tem
= Fexpand_file_name (build_string ("lib-src"),
1590 Vinstallation_directory
);
1592 /* MSDOS uses wrapped binaries, so don't do this. */
1593 if (NILP (Fmember (tem
, Vexec_path
)))
1596 const char *path_exec
= ns_exec_path ();
1598 Vexec_path
= decode_env_path ("EMACSPATH",
1600 path_exec
? path_exec
:
1603 Vexec_path
= Fcons (tem
, Vexec_path
);
1604 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1607 Vexec_directory
= Ffile_name_as_directory (tem
);
1608 #endif /* not MSDOS */
1610 /* Maybe use ../etc as well as ../lib-src. */
1613 tem
= Fexpand_file_name (build_string ("etc"),
1614 Vinstallation_directory
);
1615 Vdoc_directory
= Ffile_name_as_directory (tem
);
1619 /* Look for the files that should be in etc. We don't use
1620 Vinstallation_directory, because these files are never installed
1621 near the executable, and they are never in the build
1622 directory when that's different from the source directory.
1624 Instead, if these files are not in the nominal place, we try the
1625 source directory. */
1628 Lisp_Object tem
, tem1
, srcdir
;
1629 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1631 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1633 tem
= Fexpand_file_name (build_string ("NEWS"), Vdata_directory
);
1634 tem1
= Ffile_exists_p (tem
);
1635 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1638 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1639 tem
= Fexpand_file_name (build_string ("NEWS"), newdir
);
1640 tem1
= Ffile_exists_p (tem
);
1642 Vdata_directory
= newdir
;
1650 tempdir
= Fdirectory_file_name (Vexec_directory
);
1651 if (! file_accessible_directory_p (tempdir
))
1652 dir_warning ("arch-dependent data dir", Vexec_directory
);
1655 tempdir
= Fdirectory_file_name (Vdata_directory
);
1656 if (! file_accessible_directory_p (tempdir
))
1657 dir_warning ("arch-independent data dir", Vdata_directory
);
1659 sh
= getenv ("SHELL");
1660 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1663 Vshared_game_score_directory
= Qnil
;
1665 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1666 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1667 Vshared_game_score_directory
= Qnil
;
1672 set_initial_environment (void)
1675 for (envp
= environ
; *envp
; envp
++)
1676 Vprocess_environment
= Fcons (build_string (*envp
),
1677 Vprocess_environment
);
1678 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1679 to use `delete' and friends on process-environment. */
1680 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1684 syms_of_callproc (void)
1687 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1689 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1691 staticpro (&Vtemp_file_name_pattern
);
1694 synch_process_tempfile
= make_number (0);
1695 staticpro (&synch_process_tempfile
);
1698 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1699 doc
: /* File name to load inferior shells from.
1700 Initialized from the SHELL environment variable, or to a system-dependent
1701 default if SHELL is not set. */);
1703 DEFVAR_LISP ("exec-path", Vexec_path
,
1704 doc
: /* List of directories to search programs to run in subprocesses.
1705 Each element is a string (directory name) or nil (try default directory).
1707 By default the last element of this list is `exec-directory'. The
1708 last element is not always used, for example in shell completion
1709 (`shell-dynamic-complete-command'). */);
1711 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1712 doc
: /* List of suffixes to try to find executable file names.
1713 Each element is a string. */);
1714 Vexec_suffixes
= Qnil
;
1716 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1717 doc
: /* Directory for executables for Emacs to invoke.
1718 More generally, this includes any architecture-dependent files
1719 that are built and installed from the Emacs distribution. */);
1721 DEFVAR_LISP ("data-directory", Vdata_directory
,
1722 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1723 These are files intended for Emacs to use while it runs. */);
1725 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1726 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1727 This is usually the same as `data-directory'. */);
1729 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1730 doc
: /* For internal use by the build procedure only.
1731 This is the name of the directory in which the build procedure installed
1732 Emacs's info files; the default value for `Info-default-directory-list'
1734 Vconfigure_info_directory
= build_string (PATH_INFO
);
1736 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1737 doc
: /* Directory of score files for games which come with GNU Emacs.
1738 If this variable is nil, then Emacs is unable to use a shared directory. */);
1740 Vshared_game_score_directory
= Qnil
;
1742 Vshared_game_score_directory
= build_string (PATH_GAME
);
1745 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1746 doc
: /* List of environment variables inherited from the parent process.
1747 Each element should be a string of the form ENVVARNAME=VALUE.
1748 The elements must normally be decoded (using `locale-coding-system') for use. */);
1749 Vinitial_environment
= Qnil
;
1751 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1752 doc
: /* List of overridden environment variables for subprocesses to inherit.
1753 Each element should be a string of the form ENVVARNAME=VALUE.
1755 Entries in this list take precedence to those in the frame-local
1756 environments. Therefore, let-binding `process-environment' is an easy
1757 way to temporarily change the value of an environment variable,
1758 irrespective of where it comes from. To use `process-environment' to
1759 remove an environment variable, include only its name in the list,
1762 This variable is set to nil when Emacs starts.
1764 If multiple entries define the same variable, the first one always
1767 Non-ASCII characters are encoded according to the initial value of
1768 `locale-coding-system', i.e. the elements must normally be decoded for
1771 See `setenv' and `getenv'. */);
1772 Vprocess_environment
= Qnil
;
1774 defsubr (&Scall_process
);
1775 defsubr (&Sgetenv_internal
);
1776 defsubr (&Scall_process_region
);