1 /* Synchronous subprocess invocation for GNU Emacs.
3 Copyright (C) 1985-1988, 1993-1995, 1999-2017 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 (at
11 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/>. */
26 #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>
51 #include "syssignal.h"
53 #include "blockinput.h"
64 /* Pattern used by call-process-region to make temp files. */
65 static Lisp_Object Vtemp_file_name_pattern
;
67 /* The next two variables are used while record-unwind-protect is in place
68 during call-process for a subprocess for which record_deleted_pid has
69 not yet been called. At other times, synch_process_pid is zero and
70 synch_process_tempfile's contents are irrelevant. Doing this via static
71 C variables is more convenient than putting them into the arguments
72 of record-unwind-protect, as they need to be updated at randomish
73 times in the code, and Lisp cannot always store these values as
74 Emacs integers. It's safe to use static variables here, as the
75 code is never invoked reentrantly. */
77 /* If nonzero, a process-ID that has not been reaped. */
78 static pid_t synch_process_pid
;
80 /* If a string, the name of a temp file that has not been removed. */
82 static Lisp_Object synch_process_tempfile
;
84 # define synch_process_tempfile make_number (0)
87 /* Indexes of file descriptors that need closing on call_process_kill. */
90 /* The subsidiary process's stdout and stderr. stdin is handled
91 separately, in either Fcall_process_region or create_temp_file. */
92 CALLPROC_STDOUT
, CALLPROC_STDERR
,
94 /* How to read from a pipe (or substitute) from the subsidiary process. */
97 /* A bound on the number of file descriptors. */
101 static Lisp_Object
call_process (ptrdiff_t, Lisp_Object
*, int, ptrdiff_t);
103 /* Return the current buffer's working directory, or the home
104 directory if it's unreachable, as a string suitable for a system call.
105 Signal an error if the result would not be an accessible directory. */
108 encode_current_directory (void)
112 dir
= BVAR (current_buffer
, directory
);
114 dir
= Funhandled_file_name_directory (dir
);
116 /* If the file name handler says that dir is unreachable, use
117 a sensible default. */
119 dir
= build_string ("~");
121 dir
= expand_and_dir_to_file (dir
, Qnil
);
123 if (NILP (Ffile_accessible_directory_p (dir
)))
124 report_file_error ("Setting current directory",
125 BVAR (current_buffer
, directory
));
127 /* Remove "/:" from DIR and encode it. */
128 dir
= ENCODE_FILE (remove_slash_colon (dir
));
130 if (! file_accessible_directory_p (dir
))
131 report_file_error ("Setting current directory",
132 BVAR (current_buffer
, directory
));
137 /* If P is reapable, record it as a deleted process and kill it.
138 Do this in a critical section. Unless PID is wedged it will be
139 reaped on receipt of the first SIGCHLD after the critical section. */
142 record_kill_process (struct Lisp_Process
*p
, Lisp_Object tempfile
)
146 block_child_signal (&oldset
);
150 record_deleted_pid (p
->pid
, tempfile
);
152 kill (- p
->pid
, SIGKILL
);
155 unblock_child_signal (&oldset
);
159 /* Clean up files, file descriptors and processes created by Fcall_process. */
162 delete_temp_file (Lisp_Object name
)
164 unlink (SSDATA (name
));
168 call_process_kill (void *ptr
)
170 int *callproc_fd
= ptr
;
172 for (i
= 0; i
< CALLPROC_FDS
; i
++)
173 if (0 <= callproc_fd
[i
])
174 emacs_close (callproc_fd
[i
]);
176 if (synch_process_pid
)
178 struct Lisp_Process proc
;
180 proc
.pid
= synch_process_pid
;
181 record_kill_process (&proc
, synch_process_tempfile
);
182 synch_process_pid
= 0;
184 else if (STRINGP (synch_process_tempfile
))
185 delete_temp_file (synch_process_tempfile
);
188 /* Clean up when exiting Fcall_process: restore the buffer, and
189 kill the subsidiary process group if the process still exists. */
192 call_process_cleanup (Lisp_Object buffer
)
194 Fset_buffer (buffer
);
197 if (synch_process_pid
)
199 kill (-synch_process_pid
, SIGINT
);
200 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
202 wait_for_termination (synch_process_pid
, 0, 1);
203 synch_process_pid
= 0;
204 message1 ("Waiting for process to die...done");
210 static mode_t
const default_output_mode
= S_IREAD
| S_IWRITE
;
212 static mode_t
const default_output_mode
= 0666;
215 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
216 doc
: /* Call PROGRAM synchronously in separate process.
217 The remaining arguments are optional.
218 The program's input comes from file INFILE (nil means `/dev/null').
219 Insert output in DESTINATION before point; t means current buffer; nil for DESTINATION
220 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
221 FILE is a file name string, means that it should be written to that file
222 (if the file already exists it is overwritten).
223 DESTINATION can also have the form (REAL-BUFFER STDERR-FILE); in that case,
224 REAL-BUFFER says what to do with standard output, as above,
225 while STDERR-FILE says what to do with standard error in the child.
226 STDERR-FILE may be nil (discard standard error output),
227 t (mix it with ordinary output), or a file name string.
229 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
230 Remaining arguments are strings passed as command arguments to PROGRAM.
232 If executable PROGRAM can't be found as an executable, `call-process'
233 signals a Lisp error. `call-process' reports errors in execution of
234 the program only through its return and output.
236 If DESTINATION is 0, `call-process' returns immediately with value nil.
237 Otherwise it waits for PROGRAM to terminate
238 and returns a numeric exit status or a signal description string.
239 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
241 usage: (call-process PROGRAM &optional INFILE DESTINATION DISPLAY &rest ARGS) */)
242 (ptrdiff_t nargs
, Lisp_Object
*args
)
244 Lisp_Object infile
, encoded_infile
;
246 ptrdiff_t count
= SPECPDL_INDEX ();
248 if (nargs
>= 2 && ! NILP (args
[1]))
250 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
251 CHECK_STRING (infile
);
254 infile
= build_string (NULL_DEVICE
);
256 encoded_infile
= ENCODE_FILE (infile
);
258 filefd
= emacs_open (SSDATA (encoded_infile
), O_RDONLY
, 0);
260 report_file_error ("Opening process input file", infile
);
261 record_unwind_protect_int (close_file_unwind
, filefd
);
262 return unbind_to (count
, call_process (nargs
, args
, filefd
, -1));
265 /* Like Fcall_process (NARGS, ARGS), except use FILEFD as the input file.
267 If TEMPFILE_INDEX is nonnegative, it is the specpdl index of an
268 unwinder that is intended to remove the input temporary file; in
269 this case NARGS must be at least 2 and ARGS[1] is the file's name.
271 At entry, the specpdl stack top entry must be close_file_unwind (FILEFD). */
274 call_process (ptrdiff_t nargs
, Lisp_Object
*args
, int filefd
,
275 ptrdiff_t tempfile_index
)
277 Lisp_Object buffer
, current_dir
, path
;
280 int callproc_fd
[CALLPROC_FDS
];
283 ptrdiff_t count
= SPECPDL_INDEX ();
287 /* File to use for stderr in the child.
288 t means use same as standard output. */
289 Lisp_Object error_file
;
290 Lisp_Object output_file
= Qnil
;
291 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
292 char *tempfile
= NULL
;
298 int fd_output
, fd_error
;
299 struct coding_system process_coding
; /* coding-system of process output */
300 struct coding_system argument_coding
; /* coding-system of arguments */
301 /* Set to the return value of Ffind_operation_coding_system. */
302 Lisp_Object coding_systems
;
305 if (synch_process_pid
)
306 error ("call-process invoked recursively");
308 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
311 CHECK_STRING (args
[0]);
316 /* Without asynchronous processes we cannot have BUFFER == 0. */
318 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
319 error ("Operating system cannot handle asynchronous subprocesses");
320 #endif /* subprocesses */
322 /* Decide the coding-system for giving arguments. */
324 Lisp_Object val
, *args2
;
326 /* If arguments are supplied, we may have to encode them. */
329 bool must_encode
= 0;
330 Lisp_Object coding_attrs
;
332 for (i
= 4; i
< nargs
; i
++)
333 CHECK_STRING (args
[i
]);
335 for (i
= 4; i
< nargs
; i
++)
336 if (STRING_MULTIBYTE (args
[i
]))
339 if (!NILP (Vcoding_system_for_write
))
340 val
= Vcoding_system_for_write
;
341 else if (! must_encode
)
345 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
346 args2
[0] = Qcall_process
;
347 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
348 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
349 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
351 val
= complement_process_encoding_system (val
);
352 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
353 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
354 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
356 /* We should not use an ASCII incompatible coding system. */
357 val
= raw_text_coding_system (val
);
358 setup_coding_system (val
, &argument_coding
);
369 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
370 FILE-FOR-STDERR), unless the first element is :file, in which case see
371 the next paragraph. */
372 if (CONSP (buffer
) && !EQ (XCAR (buffer
), QCfile
))
374 if (CONSP (XCDR (buffer
)))
376 Lisp_Object stderr_file
;
377 stderr_file
= XCAR (XCDR (buffer
));
379 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
380 error_file
= stderr_file
;
382 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
385 buffer
= XCAR (buffer
);
388 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
389 if (CONSP (buffer
) && EQ (XCAR (buffer
), QCfile
))
391 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
392 BVAR (current_buffer
, directory
));
393 CHECK_STRING (output_file
);
397 if (! (NILP (buffer
) || EQ (buffer
, Qt
) || INTEGERP (buffer
)))
399 Lisp_Object spec_buffer
;
400 spec_buffer
= buffer
;
401 buffer
= Fget_buffer_create (buffer
);
402 /* Mention the buffer name for a better error message. */
404 CHECK_BUFFER (spec_buffer
);
405 CHECK_BUFFER (buffer
);
409 /* Make sure that the child will be able to chdir to the current
410 buffer's current directory, or its unhandled equivalent. We
411 can't just have the child check for an error when it does the
412 chdir, since it's in a vfork. */
413 current_dir
= encode_current_directory ();
415 if (STRINGP (error_file
))
416 error_file
= ENCODE_FILE (error_file
);
417 if (STRINGP (output_file
))
418 output_file
= ENCODE_FILE (output_file
);
420 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
422 for (i
= 0; i
< CALLPROC_FDS
; i
++)
425 synch_process_tempfile
= make_number (0);
427 record_unwind_protect_ptr (call_process_kill
, callproc_fd
);
429 /* Search for program; barf if not found. */
433 ok
= openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
,
434 make_number (X_OK
), false);
436 report_file_error ("Searching for program", args
[0]);
439 /* Remove "/:" from PATH. */
440 path
= remove_slash_colon (path
);
442 SAFE_NALLOCA (new_argv
, 1, nargs
< 4 ? 2 : nargs
- 2);
448 argument_coding
.dst_multibyte
= 0;
449 for (i
= 4; i
< nargs
; i
++)
451 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
452 if (CODING_REQUIRE_ENCODING (&argument_coding
))
453 /* We must encode this argument. */
454 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
456 for (i
= 4; i
< nargs
; i
++)
457 new_argv
[i
- 3] = SSDATA (args
[i
]);
462 path
= ENCODE_FILE (path
);
463 new_argv
[0] = SSDATA (path
);
465 discard_output
= INTEGERP (buffer
) || (NILP (buffer
) && NILP (output_file
));
468 if (! discard_output
&& ! STRINGP (output_file
))
470 char const *tmpdir
= egetenv ("TMPDIR");
471 char const *outf
= tmpdir
? tmpdir
: "";
472 tempfile
= alloca (strlen (outf
) + 20);
473 strcpy (tempfile
, outf
);
474 dostounix_filename (tempfile
);
475 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
476 strcat (tempfile
, "/");
477 strcat (tempfile
, "emXXXXXX");
480 report_file_error ("Opening process output file", Qnil
);
481 output_file
= build_string (tempfile
);
482 synch_process_tempfile
= output_file
;
488 fd_output
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
490 report_file_error ("Opening null device", Qnil
);
492 else if (STRINGP (output_file
))
494 fd_output
= emacs_open (SSDATA (output_file
),
495 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
496 default_output_mode
);
499 int open_errno
= errno
;
500 output_file
= DECODE_FILE (output_file
);
501 report_file_errno ("Opening process output file",
502 output_file
, open_errno
);
508 if (emacs_pipe (fd
) != 0)
509 report_file_error ("Creating process pipe", Qnil
);
510 callproc_fd
[CALLPROC_PIPEREAD
] = fd
[0];
513 callproc_fd
[CALLPROC_STDOUT
] = fd_output
;
515 fd_error
= fd_output
;
517 if (STRINGP (error_file
) || (NILP (error_file
) && !discard_output
))
519 fd_error
= emacs_open ((STRINGP (error_file
)
520 ? SSDATA (error_file
)
522 O_WRONLY
| O_CREAT
| O_TRUNC
| O_TEXT
,
523 default_output_mode
);
526 int open_errno
= errno
;
527 report_file_errno ("Cannot redirect stderr",
528 (STRINGP (error_file
)
529 ? DECODE_FILE (error_file
)
530 : build_string (NULL_DEVICE
)),
533 callproc_fd
[CALLPROC_STDERR
] = fd_error
;
536 #ifdef MSDOS /* MW, July 1993 */
537 status
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
542 unbind_to (count
, Qnil
);
543 synchronize_system_messages_locale ();
545 code_convert_string_norecord (build_string (strerror (child_errno
)),
546 Vlocale_coding_system
, 0);
549 for (i
= 0; i
< CALLPROC_FDS
; i
++)
550 if (0 <= callproc_fd
[i
])
552 emacs_close (callproc_fd
[i
]);
555 emacs_close (filefd
);
556 clear_unwind_protect (count
- 1);
560 /* Since CRLF is converted to LF within `decode_coding', we
561 can always open a file with binary mode. */
562 callproc_fd
[CALLPROC_PIPEREAD
] = emacs_open (tempfile
, O_RDONLY
, 0);
563 if (callproc_fd
[CALLPROC_PIPEREAD
] < 0)
565 int open_errno
= errno
;
566 report_file_errno ("Cannot re-open temporary file",
567 build_string (tempfile
), open_errno
);
573 /* Do the unwind-protect now, even though the pid is not known, so
574 that no storage allocation is done in the critical section.
575 The actual PID will be filled in during the critical section. */
576 record_unwind_protect (call_process_cleanup
, Fcurrent_buffer ());
581 block_child_signal (&oldset
);
584 pid
= child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
585 #else /* not WINDOWSNT */
587 /* vfork, and prevent local vars from being clobbered by the vfork. */
589 Lisp_Object
volatile buffer_volatile
= buffer
;
590 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
591 Lisp_Object
volatile current_dir_volatile
= current_dir
;
592 bool volatile display_p_volatile
= display_p
;
593 bool volatile sa_must_free_volatile
= sa_must_free
;
594 int volatile fd_error_volatile
= fd_error
;
595 int volatile filefd_volatile
= filefd
;
596 ptrdiff_t volatile count_volatile
= count
;
597 ptrdiff_t volatile sa_avail_volatile
= sa_avail
;
598 ptrdiff_t volatile sa_count_volatile
= sa_count
;
599 char **volatile new_argv_volatile
= new_argv
;
600 int volatile callproc_fd_volatile
[CALLPROC_FDS
];
601 for (i
= 0; i
< CALLPROC_FDS
; i
++)
602 callproc_fd_volatile
[i
] = callproc_fd
[i
];
606 buffer
= buffer_volatile
;
607 coding_systems
= coding_systems_volatile
;
608 current_dir
= current_dir_volatile
;
609 display_p
= display_p_volatile
;
610 sa_must_free
= sa_must_free_volatile
;
611 fd_error
= fd_error_volatile
;
612 filefd
= filefd_volatile
;
613 count
= count_volatile
;
614 sa_avail
= sa_avail_volatile
;
615 sa_count
= sa_count_volatile
;
616 new_argv
= new_argv_volatile
;
618 for (i
= 0; i
< CALLPROC_FDS
; i
++)
619 callproc_fd
[i
] = callproc_fd_volatile
[i
];
620 fd_output
= callproc_fd
[CALLPROC_STDOUT
];
625 unblock_child_signal (&oldset
);
629 /* Emacs ignores SIGPIPE, but the child should not. */
630 signal (SIGPIPE
, SIG_DFL
);
631 /* Likewise for SIGPROF. */
633 signal (SIGPROF
, SIG_DFL
);
636 child_setup (filefd
, fd_output
, fd_error
, new_argv
, 0, current_dir
);
639 #endif /* not WINDOWSNT */
645 synch_process_pid
= pid
;
647 if (INTEGERP (buffer
))
649 if (tempfile_index
< 0)
650 record_deleted_pid (pid
, Qnil
);
654 record_deleted_pid (pid
, args
[1]);
655 clear_unwind_protect (tempfile_index
);
657 synch_process_pid
= 0;
661 unblock_child_signal (&oldset
);
665 report_file_errno ("Doing vfork", Qnil
, child_errno
);
667 /* Close our file descriptors, except for callproc_fd[CALLPROC_PIPEREAD]
668 since we will use that to read input from. */
669 for (i
= 0; i
< CALLPROC_FDS
; i
++)
670 if (i
!= CALLPROC_PIPEREAD
&& 0 <= callproc_fd
[i
])
672 emacs_close (callproc_fd
[i
]);
675 emacs_close (filefd
);
676 clear_unwind_protect (count
- 1);
678 #endif /* not MSDOS */
680 if (INTEGERP (buffer
))
681 return unbind_to (count
, Qnil
);
683 if (BUFFERP (buffer
))
684 Fset_buffer (buffer
);
686 fd0
= callproc_fd
[CALLPROC_PIPEREAD
];
690 Lisp_Object val
, *args2
;
693 if (!NILP (Vcoding_system_for_read
))
694 val
= Vcoding_system_for_read
;
697 if (EQ (coding_systems
, Qt
))
701 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
702 args2
[0] = Qcall_process
;
703 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
705 = Ffind_operation_coding_system (nargs
+ 1, args2
);
707 if (CONSP (coding_systems
))
708 val
= XCAR (coding_systems
);
709 else if (CONSP (Vdefault_process_coding_system
))
710 val
= XCAR (Vdefault_process_coding_system
);
714 Fcheck_coding_system (val
);
715 /* In unibyte mode, character code conversion should not take
716 place but EOL conversion should. So, setup raw-text or one
717 of the subsidiary according to the information just setup. */
718 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
720 val
= raw_text_coding_system (val
);
721 setup_coding_system (val
, &process_coding
);
722 process_coding
.dst_multibyte
723 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
724 process_coding
.src_multibyte
= 0;
731 enum { CALLPROC_BUFFER_SIZE_MIN
= 16 * 1024 };
732 enum { CALLPROC_BUFFER_SIZE_MAX
= 4 * CALLPROC_BUFFER_SIZE_MIN
};
733 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
734 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
736 EMACS_INT total_read
= 0;
738 bool display_on_the_fly
= display_p
;
739 struct coding_system saved_coding
= process_coding
;
743 /* Repeatedly read until we've filled as much as possible
744 of the buffer size we have. But don't read
745 less than 1024--save that for the next bufferful. */
747 while (nread
< bufsize
- 1024)
749 int this_read
= emacs_read (fd0
, buf
+ nread
,
757 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
762 total_read
+= this_read
;
764 if (display_on_the_fly
)
768 /* Now NREAD is the total amount of data in the buffer. */
772 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
773 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
774 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
776 { /* We have to decode the input. */
778 ptrdiff_t count1
= SPECPDL_INDEX ();
780 XSETBUFFER (curbuf
, current_buffer
);
781 /* FIXME: Call signal_after_change! */
782 prepare_to_modify_buffer (PT
, PT
, NULL
);
783 /* We cannot allow after-change-functions be run
784 during decoding, because that might modify the
785 buffer, while we rely on process_coding.produced to
786 faithfully reflect inserted text until we
787 TEMP_SET_PT_BOTH below. */
788 specbind (Qinhibit_modification_hooks
, Qt
);
789 decode_coding_c_string (&process_coding
,
790 (unsigned char *) buf
, nread
, curbuf
);
791 unbind_to (count1
, Qnil
);
792 if (display_on_the_fly
793 && CODING_REQUIRE_DETECTION (&saved_coding
)
794 && ! CODING_REQUIRE_DETECTION (&process_coding
))
796 /* We have detected some coding system, but the
797 detection may have been via insufficient data.
798 So give up displaying on the fly. */
799 if (process_coding
.produced
> 0)
800 del_range_2 (process_coding
.dst_pos
,
801 process_coding
.dst_pos_byte
,
802 (process_coding
.dst_pos
803 + process_coding
.produced_char
),
804 (process_coding
.dst_pos_byte
805 + process_coding
.produced
),
807 display_on_the_fly
= false;
808 process_coding
= saved_coding
;
810 /* Make the above condition always fail in the future. */
811 saved_coding
.common_flags
812 &= ~CODING_REQUIRE_DETECTION_MASK
;
816 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
817 PT_BYTE
+ process_coding
.produced
);
818 carryover
= process_coding
.carryover_bytes
;
820 memcpy (buf
, process_coding
.carryover
,
821 process_coding
.carryover_bytes
);
824 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
827 /* Make the buffer bigger as we continue to read more data,
828 but not past CALLPROC_BUFFER_SIZE_MAX. */
829 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
830 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
831 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
835 redisplay_preserve_echo_area (1);
836 /* This variable might have been set to 0 for code
837 detection. In that case, set it back to 1 because
838 we should have already detected a coding system. */
839 display_on_the_fly
= true;
846 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
847 /* If the caller required, let the buffer inherit the
848 coding-system used to decode the process output. */
849 if (inherit_process_coding_system
)
850 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
851 make_number (total_read
));
855 /* Wait for it to terminate, unless it already has. */
856 wait_for_termination (pid
, &status
, fd0
< 0);
859 /* Don't kill any children that the subprocess may have left behind
861 synch_process_pid
= 0;
864 unbind_to (count
, Qnil
);
866 if (WIFSIGNALED (status
))
870 synchronize_system_messages_locale ();
871 signame
= strsignal (WTERMSIG (status
));
876 return code_convert_string_norecord (build_string (signame
),
877 Vlocale_coding_system
, 0);
880 eassert (WIFEXITED (status
));
881 return make_number (WEXITSTATUS (status
));
884 /* Create a temporary file suitable for storing the input data of
885 call-process-region. NARGS and ARGS are the same as for
886 call-process-region. Store into *FILENAME_STRING_PTR a Lisp string
887 naming the file, and return a file descriptor for reading.
888 Unwind-protect the file, so that the file descriptor will be closed
889 and the file removed when the caller unwinds the specpdl stack. */
892 create_temp_file (ptrdiff_t nargs
, Lisp_Object
*args
,
893 Lisp_Object
*filename_string_ptr
)
896 Lisp_Object filename_string
;
897 Lisp_Object val
, start
, end
;
900 if (STRINGP (Vtemporary_file_directory
))
901 tmpdir
= Vtemporary_file_directory
;
906 outf
= getenv ("TMPDIR");
907 tmpdir
= build_string (outf
? outf
: "/tmp/");
909 if ((outf
= egetenv ("TMPDIR"))
910 || (outf
= egetenv ("TMP"))
911 || (outf
= egetenv ("TEMP")))
912 tmpdir
= build_string (outf
);
914 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
919 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
924 /* Cannot use the result of Fexpand_file_name, because it
925 downcases the XXXXXX part of the pattern, and mktemp then
926 doesn't recognize it. */
927 if (!NILP (Vw32_downcase_file_names
))
929 Lisp_Object dirname
= Ffile_name_directory (pattern
);
932 pattern
= Vtemp_file_name_pattern
;
934 pattern
= concat2 (dirname
, Vtemp_file_name_pattern
);
938 filename_string
= Fcopy_sequence (ENCODE_FILE (pattern
));
939 tempfile
= SSDATA (filename_string
);
941 count
= SPECPDL_INDEX ();
942 record_unwind_protect_nothing ();
943 fd
= mkostemp (tempfile
, O_BINARY
| O_CLOEXEC
);
945 report_file_error ("Failed to open temporary file using pattern",
947 set_unwind_protect (count
, delete_temp_file
, filename_string
);
948 record_unwind_protect_int (close_file_unwind
, fd
);
953 /* Decide coding-system of the contents of the temporary file. */
954 if (!NILP (Vcoding_system_for_write
))
955 val
= Vcoding_system_for_write
;
956 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
960 Lisp_Object coding_systems
;
963 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
964 args2
[0] = Qcall_process_region
;
965 memcpy (args2
+ 1, args
, nargs
* sizeof *args
);
966 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
967 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
970 val
= complement_process_encoding_system (val
);
973 ptrdiff_t count1
= SPECPDL_INDEX ();
975 specbind (intern ("coding-system-for-write"), val
);
976 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
977 happen to get a ".Z" suffix. */
978 specbind (Qfile_name_handler_alist
, Qnil
);
979 write_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
, fd
);
981 unbind_to (count1
, Qnil
);
984 if (lseek (fd
, 0, SEEK_SET
) < 0)
985 report_file_error ("Setting file position", filename_string
);
987 /* Note that Fcall_process takes care of binding
988 coding-system-for-read. */
990 *filename_string_ptr
= filename_string
;
994 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
996 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
998 START and END are normally buffer positions specifying the part of the
999 buffer to send to the process.
1000 If START is nil, that means to use the entire buffer contents; END is
1002 If START is a string, then send that string to the process
1003 instead of any buffer contents; END is ignored.
1004 The remaining arguments are optional.
1005 Delete the text if fourth arg DELETE is non-nil.
1007 Insert output in BUFFER before point; t means current buffer; nil for
1008 BUFFER means discard it; 0 means discard and don't wait; and `(:file
1009 FILE)', where FILE is a file name string, means that it should be
1010 written to that file (if the file already exists it is overwritten).
1011 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
1012 REAL-BUFFER says what to do with standard output, as above,
1013 while STDERR-FILE says what to do with standard error in the child.
1014 STDERR-FILE may be nil (discard standard error output),
1015 t (mix it with ordinary output), or a file name string.
1017 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
1018 Remaining args are passed to PROGRAM at startup as command args.
1020 If BUFFER is 0, `call-process-region' returns immediately with value nil.
1021 Otherwise it waits for PROGRAM to terminate
1022 and returns a numeric exit status or a signal description string.
1023 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
1025 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
1026 (ptrdiff_t nargs
, Lisp_Object
*args
)
1028 Lisp_Object infile
, val
;
1029 ptrdiff_t count
= SPECPDL_INDEX ();
1030 Lisp_Object start
= args
[0];
1031 Lisp_Object end
= args
[1];
1035 if (STRINGP (start
))
1036 empty_input
= SCHARS (start
) == 0;
1037 else if (NILP (start
))
1038 empty_input
= BEG
== Z
;
1041 validate_region (&args
[0], &args
[1]);
1044 empty_input
= XINT (start
) == XINT (end
);
1048 fd
= create_temp_file (nargs
, args
, &infile
);
1052 fd
= emacs_open (NULL_DEVICE
, O_RDONLY
, 0);
1054 report_file_error ("Opening null device", Qnil
);
1055 record_unwind_protect_int (close_file_unwind
, fd
);
1058 if (nargs
> 3 && !NILP (args
[3]))
1059 Fdelete_region (start
, end
);
1073 val
= call_process (nargs
, args
, fd
, empty_input
? -1 : count
);
1074 return unbind_to (count
, val
);
1078 add_env (char **env
, char **new_env
, char *string
)
1085 /* See if this string duplicates any string already in the env.
1086 If so, don't put it in.
1087 When an env var has multiple definitions,
1088 we keep the definition that comes first in process-environment. */
1089 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1091 char *p
= *ep
, *q
= string
;
1097 /* The string is a lone variable name; keep it for now, we
1098 will remove it later. It is a placeholder for a
1099 variable that is not to be included in the environment. */
1107 *new_env
++ = string
;
1113 /* 'exec' failed inside a child running NAME, with error number ERR.
1114 Possibly a vforked child needed to allocate a large vector on the
1115 stack; such a child cannot fall back on malloc because that might
1116 mess up the allocator's data structures in the parent.
1117 Report the error and exit the child. */
1119 static _Noreturn
void
1120 exec_failed (char const *name
, int err
)
1122 /* Avoid deadlock if the child's perror writes to a full pipe; the
1123 pipe's reader is the parent, but with vfork the parent can't
1124 run until the child exits. Truncate the diagnostic instead. */
1125 fcntl (STDERR_FILENO
, F_SETFL
, O_NONBLOCK
);
1128 emacs_perror (name
);
1129 _exit (err
== ENOENT
? EXIT_ENOENT
: EXIT_CANNOT_INVOKE
);
1134 /* Do nothing. There is no need to fail, as DOS_NT platforms do not
1135 fork and exec, and handle alloca exhaustion in a different way. */
1138 exec_failed (char const *name
, int err
)
1144 /* This is the last thing run in a newly forked inferior
1145 either synchronous or asynchronous.
1146 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1147 Initialize inferior's priority, pgrp, connected dir and environment.
1148 then exec another program based on new_argv.
1150 If SET_PGRP, put the subprocess into a separate process group.
1152 CURRENT_DIR is an elisp string giving the path of the current
1153 directory the subprocess should have. Since we can't really signal
1154 a decent error from within the child, this should be verified as an
1155 executable directory by the parent.
1157 On GNUish hosts, either exec or return an error number.
1158 On MS-Windows, either return a pid or signal an error.
1159 On MS-DOS, either return an exit status or signal an error. */
1162 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1163 Lisp_Object current_dir
)
1171 pid_t pid
= getpid ();
1172 #endif /* WINDOWSNT */
1174 /* Note that use of alloca is always safe here. It's obvious for systems
1175 that do not have true vfork or that have true (stack) alloca.
1176 If using vfork and C_ALLOCA (when Emacs used to include
1177 src/alloca.c) it is safe because that changes the superior's
1178 static variables as if the superior had done alloca and will be
1179 cleaned up in the usual way. */
1184 i
= SBYTES (current_dir
);
1186 /* MSDOS must have all environment variables malloc'ed, because
1187 low-level libc functions that launch subsidiary processes rely
1189 pwd_var
= xmalloc (i
+ 5);
1191 if (MAX_ALLOCA
- 5 < i
)
1192 exec_failed (new_argv
[0], ENOMEM
);
1193 pwd_var
= alloca (i
+ 5);
1196 memcpy (pwd_var
, "PWD=", 4);
1197 lispstpcpy (temp
, current_dir
);
1200 /* We can't signal an Elisp error here; we're in a vfork. Since
1201 the callers check the current directory before forking, this
1202 should only return an error if the directory's permissions
1203 are changed between the check and this chdir, but we should
1205 if (chdir (temp
) < 0)
1206 _exit (EXIT_CANCELED
);
1208 /* Get past the drive letter, so that d:/ is left alone. */
1209 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1216 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1217 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1221 /* Set `env' to a vector of the strings in the environment. */
1223 register Lisp_Object tem
;
1224 register char **new_env
;
1226 register int new_length
;
1227 Lisp_Object display
= Qnil
;
1231 for (tem
= Vprocess_environment
;
1232 CONSP (tem
) && STRINGP (XCAR (tem
));
1235 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1236 && (SDATA (XCAR (tem
)) [7] == '\0'
1237 || SDATA (XCAR (tem
)) [7] == '='))
1238 /* DISPLAY is specified in process-environment. */
1243 /* If not provided yet, use the frame's DISPLAY. */
1246 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1247 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1248 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1249 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1250 Vinitial_environment
);
1258 /* new_length + 2 to include PWD and terminating 0. */
1259 if (MAX_ALLOCA
/ sizeof *env
- 2 < new_length
)
1260 exec_failed (new_argv
[0], ENOMEM
);
1261 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1262 /* If we have a PWD envvar, pass one down,
1263 but with corrected value. */
1264 if (egetenv ("PWD"))
1265 *new_env
++ = pwd_var
;
1267 if (STRINGP (display
))
1269 if (MAX_ALLOCA
- sizeof "DISPLAY=" < SBYTES (display
))
1270 exec_failed (new_argv
[0], ENOMEM
);
1271 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1272 lispstpcpy (stpcpy (vdata
, "DISPLAY="), display
);
1273 new_env
= add_env (env
, new_env
, vdata
);
1277 for (tem
= Vprocess_environment
;
1278 CONSP (tem
) && STRINGP (XCAR (tem
));
1280 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1284 /* Remove variable names without values. */
1288 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1298 prepare_standard_handles (in
, out
, err
, handles
);
1299 set_process_dir (SSDATA (current_dir
));
1300 /* Spawn the child. (See w32proc.c:sys_spawnve). */
1301 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1302 reset_standard_handles (in
, out
, err
, handles
);
1304 /* An error occurred while trying to spawn the process. */
1305 report_file_error ("Spawning child process", Qnil
);
1308 #else /* not WINDOWSNT */
1312 restore_nofile_limit ();
1314 /* Redirect file descriptors and clear the close-on-exec flag on the
1315 redirected ones. IN, OUT, and ERR are close-on-exec so they
1316 need not be closed explicitly. */
1317 dup2 (in
, STDIN_FILENO
);
1318 dup2 (out
, STDOUT_FILENO
);
1319 dup2 (err
, STDERR_FILENO
);
1324 int errnum
= emacs_exec_file (new_argv
[0], new_argv
, env
);
1325 exec_failed (new_argv
[0], errnum
);
1328 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1331 /* An error occurred while trying to run the subprocess. */
1332 report_file_error ("Spawning child process", Qnil
);
1335 #endif /* not WINDOWSNT */
1339 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1340 ptrdiff_t *valuelen
, Lisp_Object env
)
1342 for (; CONSP (env
); env
= XCDR (env
))
1344 Lisp_Object entry
= XCAR (env
);
1346 && SBYTES (entry
) >= varlen
1348 /* NT environment variables are case insensitive. */
1349 && ! strnicmp (SSDATA (entry
), var
, varlen
)
1350 #else /* not WINDOWSNT */
1351 && ! memcmp (SDATA (entry
), var
, varlen
)
1352 #endif /* not WINDOWSNT */
1355 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1357 *value
= SSDATA (entry
) + (varlen
+ 1);
1358 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1361 else if (SBYTES (entry
) == varlen
)
1363 /* Lone variable names in Vprocess_environment mean that
1364 variable should be removed from the environment. */
1374 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1375 ptrdiff_t *valuelen
, Lisp_Object frame
)
1377 /* Try to find VAR in Vprocess_environment first. */
1378 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1379 Vprocess_environment
))
1380 return *value
? 1 : 0;
1382 /* On Windows we make some modifications to Emacs' environment
1383 without recording them in Vprocess_environment. */
1386 char* tmpval
= getenv (var
);
1390 *valuelen
= strlen (tmpval
);
1396 /* For DISPLAY try to get the values from the frame or the initial env. */
1397 if (strcmp (var
, "DISPLAY") == 0)
1400 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1401 if (STRINGP (display
))
1403 *value
= SSDATA (display
);
1404 *valuelen
= SBYTES (display
);
1407 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1408 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1409 Vinitial_environment
))
1410 return *value
? 1 : 0;
1416 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1417 doc
: /* Get the value of environment variable VARIABLE.
1418 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1419 the environment. Otherwise, value is a string.
1421 This function searches `process-environment' for VARIABLE.
1423 If optional parameter ENV is a list, then search this list instead of
1424 `process-environment', and return t when encountering a negative entry
1425 \(an entry for a variable with no value). */)
1426 (Lisp_Object variable
, Lisp_Object env
)
1431 CHECK_STRING (variable
);
1434 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1435 &value
, &valuelen
, env
))
1436 return value
? make_string (value
, valuelen
) : Qt
;
1440 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1441 &value
, &valuelen
, env
))
1442 return make_string (value
, valuelen
);
1447 /* A version of getenv that consults the Lisp environment lists,
1448 easily callable from C. This is usually called from egetenv. */
1450 egetenv_internal (const char *var
, ptrdiff_t len
)
1455 if (getenv_internal (var
, len
, &value
, &valuelen
, Qnil
))
1462 /* This is run before init_cmdargs. */
1465 init_callproc_1 (void)
1468 const char *etc_dir
= ns_etc_directory ();
1469 const char *path_exec
= ns_exec_path ();
1472 Vdata_directory
= decode_env_path ("EMACSDATA",
1477 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1479 Vdoc_directory
= decode_env_path ("EMACSDOC",
1484 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1486 /* Check the EMACSPATH environment variable, defaulting to the
1487 PATH_EXEC path from epaths.h. */
1488 Vexec_path
= decode_env_path ("EMACSPATH",
1490 path_exec
? path_exec
:
1493 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1494 /* FIXME? For ns, path_exec should go at the front? */
1495 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1498 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1501 init_callproc (void)
1503 bool data_dir
= egetenv ("EMACSDATA") != 0;
1506 Lisp_Object tempdir
;
1509 data_dir
= ns_etc_directory () != 0;
1512 if (!NILP (Vinstallation_directory
))
1514 /* Add to the path the lib-src subdir of the installation dir. */
1516 tem
= Fexpand_file_name (build_string ("lib-src"),
1517 Vinstallation_directory
);
1519 /* MSDOS uses wrapped binaries, so don't do this. */
1520 if (NILP (Fmember (tem
, Vexec_path
)))
1523 const char *path_exec
= ns_exec_path ();
1525 /* Running uninstalled, so default to tem rather than PATH_EXEC. */
1526 Vexec_path
= decode_env_path ("EMACSPATH",
1528 path_exec
? path_exec
:
1531 Vexec_path
= nconc2 (decode_env_path ("PATH", "", 0), Vexec_path
);
1534 Vexec_directory
= Ffile_name_as_directory (tem
);
1535 #endif /* not MSDOS */
1537 /* Maybe use ../etc as well as ../lib-src. */
1540 tem
= Fexpand_file_name (build_string ("etc"),
1541 Vinstallation_directory
);
1542 Vdoc_directory
= Ffile_name_as_directory (tem
);
1546 /* Look for the files that should be in etc. We don't use
1547 Vinstallation_directory, because these files are never installed
1548 near the executable, and they are never in the build
1549 directory when that's different from the source directory.
1551 Instead, if these files are not in the nominal place, we try the
1552 source directory. */
1555 Lisp_Object tem
, tem1
, srcdir
;
1556 Lisp_Object lispdir
= Fcar (decode_env_path (0, PATH_DUMPLOADSEARCH
, 0));
1558 srcdir
= Fexpand_file_name (build_string ("../src/"), lispdir
);
1560 tem
= Fexpand_file_name (build_string ("NEWS"), Vdata_directory
);
1561 tem1
= Ffile_exists_p (tem
);
1562 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1565 newdir
= Fexpand_file_name (build_string ("../etc/"), lispdir
);
1566 tem
= Fexpand_file_name (build_string ("NEWS"), newdir
);
1567 tem1
= Ffile_exists_p (tem
);
1569 Vdata_directory
= newdir
;
1577 tempdir
= Fdirectory_file_name (Vexec_directory
);
1578 if (! file_accessible_directory_p (tempdir
))
1579 dir_warning ("arch-dependent data dir", Vexec_directory
);
1582 tempdir
= Fdirectory_file_name (Vdata_directory
);
1583 if (! file_accessible_directory_p (tempdir
))
1584 dir_warning ("arch-independent data dir", Vdata_directory
);
1586 sh
= getenv ("SHELL");
1587 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1590 Vshared_game_score_directory
= Qnil
;
1592 Vshared_game_score_directory
= build_unibyte_string (PATH_GAME
);
1593 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1594 Vshared_game_score_directory
= Qnil
;
1599 set_initial_environment (void)
1602 for (envp
= environ
; *envp
; envp
++)
1603 Vprocess_environment
= Fcons (build_string (*envp
),
1604 Vprocess_environment
);
1605 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1606 to use `delete' and friends on process-environment. */
1607 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1611 syms_of_callproc (void)
1614 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1616 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1618 staticpro (&Vtemp_file_name_pattern
);
1621 synch_process_tempfile
= make_number (0);
1622 staticpro (&synch_process_tempfile
);
1625 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1626 doc
: /* File name to load inferior shells from.
1627 Initialized from the SHELL environment variable, or to a system-dependent
1628 default if SHELL is unset. See Info node `(elisp)Security Considerations'. */);
1630 DEFVAR_LISP ("exec-path", Vexec_path
,
1631 doc
: /* List of directories to search programs to run in subprocesses.
1632 Each element is a string (directory name) or nil (try default directory).
1634 By default the last element of this list is `exec-directory'. The
1635 last element is not always used, for example in shell completion
1636 \(`shell-dynamic-complete-command'). */);
1638 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1639 doc
: /* List of suffixes to try to find executable file names.
1640 Each element is a string. */);
1641 Vexec_suffixes
= Qnil
;
1643 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1644 doc
: /* Directory for executables for Emacs to invoke.
1645 More generally, this includes any architecture-dependent files
1646 that are built and installed from the Emacs distribution. */);
1648 DEFVAR_LISP ("data-directory", Vdata_directory
,
1649 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1650 These are files intended for Emacs to use while it runs. */);
1652 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1653 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1654 This is usually the same as `data-directory'. */);
1656 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1657 doc
: /* For internal use by the build procedure only.
1658 This is the name of the directory in which the build procedure installed
1659 Emacs's info files; the default value for `Info-default-directory-list'
1661 Vconfigure_info_directory
= build_string (PATH_INFO
);
1663 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1664 doc
: /* Directory of score files for games which come with GNU Emacs.
1665 If this variable is nil, then Emacs is unable to use a shared directory. */);
1667 Vshared_game_score_directory
= Qnil
;
1669 Vshared_game_score_directory
= build_string (PATH_GAME
);
1672 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1673 doc
: /* List of environment variables inherited from the parent process.
1674 Each element should be a string of the form ENVVARNAME=VALUE.
1675 The elements must normally be decoded (using `locale-coding-system') for use. */);
1676 Vinitial_environment
= Qnil
;
1678 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1679 doc
: /* List of overridden environment variables for subprocesses to inherit.
1680 Each element should be a string of the form ENVVARNAME=VALUE.
1682 Entries in this list take precedence to those in the frame-local
1683 environments. Therefore, let-binding `process-environment' is an easy
1684 way to temporarily change the value of an environment variable,
1685 irrespective of where it comes from. To use `process-environment' to
1686 remove an environment variable, include only its name in the list,
1689 This variable is set to nil when Emacs starts.
1691 If multiple entries define the same variable, the first one always
1694 Non-ASCII characters are encoded according to the initial value of
1695 `locale-coding-system', i.e. the elements must normally be decoded for
1698 See `setenv' and `getenv'. */);
1699 Vprocess_environment
= Qnil
;
1701 defsubr (&Scall_process
);
1702 defsubr (&Sgetenv_internal
);
1703 defsubr (&Scall_process_region
);