1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2012
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
24 #include <sys/types.h>
36 #define _P_NOWAIT 1 /* from process.h */
39 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
41 #include <sys/param.h>
45 #include "character.h"
49 #include "composite.h"
52 #include "syssignal.h"
55 #include "blockinput.h"
57 #include "termhooks.h"
67 /* Pattern used by call-process-region to make temp files. */
68 static Lisp_Object Vtemp_file_name_pattern
;
70 /* True if we are about to fork off a synchronous process or if we
71 are waiting for it. */
72 bool synch_process_alive
;
74 /* Nonzero => this is a string explaining death of synchronous subprocess. */
75 const char *synch_process_death
;
77 /* Nonzero => this is the signal number that terminated the subprocess. */
78 int synch_process_termsig
;
80 /* If synch_process_death is zero,
81 this is exit code of synchronous subprocess. */
82 int synch_process_retcode
;
85 /* Clean up when exiting Fcall_process.
86 On MSDOS, delete the temporary file on any kind of termination.
87 On Unix, kill the process and any children on termination by signal. */
89 /* True if this is termination due to exit. */
90 static bool call_process_exited
;
93 call_process_kill (Lisp_Object fdpid
)
97 CONS_TO_INTEGER (Fcar (fdpid
), int, fd
);
98 CONS_TO_INTEGER (Fcdr (fdpid
), pid_t
, pid
);
100 EMACS_KILLPG (pid
, SIGKILL
);
101 synch_process_alive
= 0;
106 call_process_cleanup (Lisp_Object arg
)
108 Lisp_Object fdpid
= Fcdr (arg
);
116 Fset_buffer (Fcar (arg
));
117 CONS_TO_INTEGER (Fcar (fdpid
), int, fd
);
120 /* for MSDOS fdpid is really (fd . tempfile) */
122 /* FD is -1 and FILE is "" when we didn't actually create a
123 temporary file in call-process. */
126 if (!(strcmp (SDATA (file
), NULL_DEVICE
) == 0 || SREF (file
, 0) == '\0'))
127 unlink (SDATA (file
));
128 #else /* not MSDOS */
129 CONS_TO_INTEGER (Fcdr (fdpid
), pid_t
, pid
);
131 if (call_process_exited
)
137 if (EMACS_KILLPG (pid
, SIGINT
) == 0)
139 ptrdiff_t count
= SPECPDL_INDEX ();
140 record_unwind_protect (call_process_kill
, fdpid
);
141 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
144 wait_for_termination (pid
);
146 specpdl_ptr
= specpdl
+ count
; /* Discard the unwind protect. */
147 message1 ("Waiting for process to die...done");
149 synch_process_alive
= 0;
151 #endif /* not MSDOS */
155 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
156 doc
: /* Call PROGRAM synchronously in separate process.
157 The remaining arguments are optional.
158 The program's input comes from file INFILE (nil means `/dev/null').
159 Insert output in BUFFER before point; t means current buffer; nil for BUFFER
160 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
161 FILE is a file name string, means that it should be written to that file
162 \(if the file already exists it is overwritten).
163 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
164 REAL-BUFFER says what to do with standard output, as above,
165 while STDERR-FILE says what to do with standard error in the child.
166 STDERR-FILE may be nil (discard standard error output),
167 t (mix it with ordinary output), or a file name string.
169 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
170 Remaining arguments are strings passed as command arguments to PROGRAM.
172 If executable PROGRAM can't be found as an executable, `call-process'
173 signals a Lisp error. `call-process' reports errors in execution of
174 the program only through its return and output.
176 If BUFFER is 0, `call-process' returns immediately with value nil.
177 Otherwise it waits for PROGRAM to terminate
178 and returns a numeric exit status or a signal description string.
179 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
181 usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS) */)
182 (ptrdiff_t nargs
, Lisp_Object
*args
)
184 Lisp_Object infile
, buffer
, current_dir
, path
, cleanup_info_tail
;
188 #define CALLPROC_BUFFER_SIZE_MIN (16 * 1024)
189 #define CALLPROC_BUFFER_SIZE_MAX (4 * CALLPROC_BUFFER_SIZE_MIN)
190 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
191 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
192 ptrdiff_t count
= SPECPDL_INDEX ();
195 register const unsigned char **new_argv
;
196 /* File to use for stderr in the child.
197 t means use same as standard output. */
198 Lisp_Object error_file
;
199 Lisp_Object output_file
= Qnil
;
200 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
201 char *outf
, *tempfile
= NULL
;
208 struct coding_system process_coding
; /* coding-system of process output */
209 struct coding_system argument_coding
; /* coding-system of arguments */
210 /* Set to the return value of Ffind_operation_coding_system. */
211 Lisp_Object coding_systems
;
212 bool output_to_buffer
= 1;
214 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
217 CHECK_STRING (args
[0]);
222 /* Without asynchronous processes we cannot have BUFFER == 0. */
224 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
225 error ("Operating system cannot handle asynchronous subprocesses");
226 #endif /* subprocesses */
228 /* Decide the coding-system for giving arguments. */
230 Lisp_Object val
, *args2
;
233 /* If arguments are supplied, we may have to encode them. */
236 bool must_encode
= 0;
237 Lisp_Object coding_attrs
;
239 for (i
= 4; i
< nargs
; i
++)
240 CHECK_STRING (args
[i
]);
242 for (i
= 4; i
< nargs
; i
++)
243 if (STRING_MULTIBYTE (args
[i
]))
246 if (!NILP (Vcoding_system_for_write
))
247 val
= Vcoding_system_for_write
;
248 else if (! must_encode
)
252 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
253 args2
[0] = Qcall_process
;
254 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
255 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
256 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
258 val
= complement_process_encoding_system (val
);
259 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
260 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
261 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
263 /* We should not use an ASCII incompatible coding system. */
264 val
= raw_text_coding_system (val
);
265 setup_coding_system (val
, &argument_coding
);
270 if (nargs
>= 2 && ! NILP (args
[1]))
272 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
273 CHECK_STRING (infile
);
276 infile
= build_string (NULL_DEVICE
);
282 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
283 FILE-FOR-STDERR), unless the first element is :file, in which case see
284 the next paragraph. */
286 && (! SYMBOLP (XCAR (buffer
))
287 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file")))
289 if (CONSP (XCDR (buffer
)))
291 Lisp_Object stderr_file
;
292 stderr_file
= XCAR (XCDR (buffer
));
294 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
295 error_file
= stderr_file
;
297 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
300 buffer
= XCAR (buffer
);
303 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
305 && SYMBOLP (XCAR (buffer
))
306 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file"))
308 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
309 BVAR (current_buffer
, directory
));
310 CHECK_STRING (output_file
);
314 if (!(EQ (buffer
, Qnil
)
316 || INTEGERP (buffer
)))
318 Lisp_Object spec_buffer
;
319 spec_buffer
= buffer
;
320 buffer
= Fget_buffer_create (buffer
);
321 /* Mention the buffer name for a better error message. */
323 CHECK_BUFFER (spec_buffer
);
324 CHECK_BUFFER (buffer
);
330 /* Make sure that the child will be able to chdir to the current
331 buffer's current directory, or its unhandled equivalent. We
332 can't just have the child check for an error when it does the
333 chdir, since it's in a vfork.
335 We have to GCPRO around this because Fexpand_file_name,
336 Funhandled_file_name_directory, and Ffile_accessible_directory_p
337 might call a file name handling function. The argument list is
338 protected by the caller, so all we really have to worry about is
341 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
343 current_dir
= BVAR (current_buffer
, directory
);
345 GCPRO5 (infile
, buffer
, current_dir
, error_file
, output_file
);
347 current_dir
= Funhandled_file_name_directory (current_dir
);
348 if (NILP (current_dir
))
349 /* If the file name handler says that current_dir is unreachable, use
350 a sensible default. */
351 current_dir
= build_string ("~/");
352 current_dir
= expand_and_dir_to_file (current_dir
, Qnil
);
353 current_dir
= Ffile_name_as_directory (current_dir
);
355 if (NILP (Ffile_accessible_directory_p (current_dir
)))
356 report_file_error ("Setting current directory",
357 Fcons (BVAR (current_buffer
, directory
), Qnil
));
359 if (STRING_MULTIBYTE (infile
))
360 infile
= ENCODE_FILE (infile
);
361 if (STRING_MULTIBYTE (current_dir
))
362 current_dir
= ENCODE_FILE (current_dir
);
363 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
364 error_file
= ENCODE_FILE (error_file
);
365 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
366 output_file
= ENCODE_FILE (output_file
);
370 display_p
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
372 filefd
= emacs_open (SSDATA (infile
), O_RDONLY
, 0);
375 infile
= DECODE_FILE (infile
);
376 report_file_error ("Opening process input file", Fcons (infile
, Qnil
));
379 if (STRINGP (output_file
))
382 fd_output
= emacs_open (SSDATA (output_file
),
383 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
385 #else /* not DOS_NT */
386 fd_output
= creat (SSDATA (output_file
), 0666);
387 #endif /* not DOS_NT */
390 output_file
= DECODE_FILE (output_file
);
391 report_file_error ("Opening process output file",
392 Fcons (output_file
, Qnil
));
394 if (STRINGP (error_file
) || NILP (error_file
))
395 output_to_buffer
= 0;
398 /* Search for program; barf if not found. */
400 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
402 GCPRO4 (infile
, buffer
, current_dir
, error_file
);
403 openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
408 emacs_close (filefd
);
409 report_file_error ("Searching for program", Fcons (args
[0], Qnil
));
412 /* If program file name starts with /: for quoting a magic name,
414 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
415 && SREF (path
, 1) == ':')
416 path
= Fsubstring (path
, make_number (2), Qnil
);
418 new_argv
= SAFE_ALLOCA ((nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
422 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
424 GCPRO5 (infile
, buffer
, current_dir
, path
, error_file
);
425 argument_coding
.dst_multibyte
= 0;
426 for (i
= 4; i
< nargs
; i
++)
428 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
429 if (CODING_REQUIRE_ENCODING (&argument_coding
))
430 /* We must encode this argument. */
431 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
434 for (i
= 4; i
< nargs
; i
++)
435 new_argv
[i
- 3] = SDATA (args
[i
]);
440 new_argv
[0] = SDATA (path
);
442 #ifdef MSDOS /* MW, July 1993 */
444 /* If we're redirecting STDOUT to a file, that file is already open
448 if ((outf
= egetenv ("TMPDIR")))
449 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
452 tempfile
= alloca (20);
455 dostounix_filename (tempfile
);
456 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
457 strcat (tempfile
, "/");
458 strcat (tempfile
, "detmp.XXX");
460 outfilefd
= creat (tempfile
, S_IREAD
| S_IWRITE
);
462 emacs_close (filefd
);
463 report_file_error ("Opening process output file",
464 Fcons (build_string (tempfile
), Qnil
));
468 outfilefd
= fd_output
;
473 if (INTEGERP (buffer
))
474 fd
[1] = emacs_open (NULL_DEVICE
, O_WRONLY
, 0), fd
[0] = -1;
481 emacs_close (filefd
);
482 report_file_error ("Creating process pipe", Qnil
);
488 /* child_setup must clobber environ in systems with true vfork.
489 Protect it from permanent change. */
490 register char **save_environ
= environ
;
491 register int fd1
= fd
[1];
497 /* Record that we're about to create a synchronous process. */
498 synch_process_alive
= 1;
500 /* These vars record information from process termination.
501 Clear them now before process can possibly terminate,
502 to avoid timing error if process terminates soon. */
503 synch_process_death
= 0;
504 synch_process_retcode
= 0;
505 synch_process_termsig
= 0;
507 if (NILP (error_file
))
508 fd_error
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
509 else if (STRINGP (error_file
))
512 fd_error
= emacs_open (SSDATA (error_file
),
513 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
515 #else /* not DOS_NT */
516 fd_error
= creat (SSDATA (error_file
), 0666);
517 #endif /* not DOS_NT */
522 emacs_close (filefd
);
530 if (NILP (error_file
))
531 error_file
= build_string (NULL_DEVICE
);
532 else if (STRINGP (error_file
))
533 error_file
= DECODE_FILE (error_file
);
534 report_file_error ("Cannot redirect stderr", Fcons (error_file
, Qnil
));
537 #ifdef MSDOS /* MW, July 1993 */
538 /* Note that on MSDOS `child_setup' actually returns the child process
539 exit status, not its PID, so we assign it to `synch_process_retcode'
541 pid
= child_setup (filefd
, outfilefd
, fd_error
, (char **) new_argv
,
544 /* Record that the synchronous process exited and note its
545 termination status. */
546 synch_process_alive
= 0;
547 synch_process_retcode
= pid
;
548 if (synch_process_retcode
< 0) /* means it couldn't be exec'ed */
550 synchronize_system_messages_locale ();
551 synch_process_death
= strerror (errno
);
554 emacs_close (outfilefd
);
555 if (fd_error
!= outfilefd
)
556 emacs_close (fd_error
);
557 fd1
= -1; /* No harm in closing that one! */
560 /* Since CRLF is converted to LF within `decode_coding', we
561 can always open a file with binary mode. */
562 fd
[0] = emacs_open (tempfile
, O_RDONLY
| O_BINARY
, 0);
566 emacs_close (filefd
);
567 report_file_error ("Cannot re-open temporary file",
568 Fcons (build_string (tempfile
), Qnil
));
572 fd
[0] = -1; /* We are not going to read from tempfile. */
573 #else /* not MSDOS */
575 pid
= child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
577 #else /* not WINDOWSNT */
581 /* vfork, and prevent local vars from being clobbered by the vfork. */
583 Lisp_Object
volatile buffer_volatile
= buffer
;
584 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
585 Lisp_Object
volatile current_dir_volatile
= current_dir
;
586 bool volatile display_p_volatile
= display_p
;
587 bool volatile output_to_buffer_volatile
= output_to_buffer
;
588 bool volatile sa_must_free_volatile
= sa_must_free
;
589 int volatile fd1_volatile
= fd1
;
590 int volatile fd_error_volatile
= fd_error
;
591 int volatile fd_output_volatile
= fd_output
;
592 ptrdiff_t volatile sa_count_volatile
= sa_count
;
593 unsigned char const **volatile new_argv_volatile
= new_argv
;
597 buffer
= buffer_volatile
;
598 coding_systems
= coding_systems_volatile
;
599 current_dir
= current_dir_volatile
;
600 display_p
= display_p_volatile
;
602 fd_error
= fd_error_volatile
;
603 fd_output
= fd_output_volatile
;
604 output_to_buffer
= output_to_buffer_volatile
;
605 sa_must_free
= sa_must_free_volatile
;
606 sa_count
= sa_count_volatile
;
607 new_argv
= new_argv_volatile
;
617 /* Emacs ignores SIGPIPE, but the child should not. */
618 signal (SIGPIPE
, SIG_DFL
);
620 child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
626 #endif /* not WINDOWSNT */
628 /* The MSDOS case did this already. */
630 emacs_close (fd_error
);
631 #endif /* not MSDOS */
633 environ
= save_environ
;
635 /* Close most of our fd's, but not fd[0]
636 since we will use that to read input from. */
637 emacs_close (filefd
);
639 emacs_close (fd_output
);
640 if (fd1
>= 0 && fd1
!= fd_error
)
648 report_file_error ("Doing vfork", Qnil
);
651 if (INTEGERP (buffer
))
658 /* Enable sending signal if user quits below. */
659 call_process_exited
= 0;
662 /* MSDOS needs different cleanup information. */
663 cleanup_info_tail
= build_string (tempfile
? tempfile
: "");
665 cleanup_info_tail
= INTEGER_TO_CONS (pid
);
666 #endif /* not MSDOS */
667 record_unwind_protect (call_process_cleanup
,
668 Fcons (Fcurrent_buffer (),
669 Fcons (INTEGER_TO_CONS (fd
[0]),
670 cleanup_info_tail
)));
672 if (BUFFERP (buffer
))
673 Fset_buffer (buffer
);
677 /* If BUFFER is nil, we must read process output once and then
678 discard it, so setup coding system but with nil. */
679 setup_coding_system (Qnil
, &process_coding
);
680 process_coding
.dst_multibyte
= 0;
684 Lisp_Object val
, *args2
;
687 if (!NILP (Vcoding_system_for_read
))
688 val
= Vcoding_system_for_read
;
691 if (EQ (coding_systems
, Qt
))
695 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
696 args2
[0] = Qcall_process
;
697 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
699 = Ffind_operation_coding_system (nargs
+ 1, args2
);
701 if (CONSP (coding_systems
))
702 val
= XCAR (coding_systems
);
703 else if (CONSP (Vdefault_process_coding_system
))
704 val
= XCAR (Vdefault_process_coding_system
);
708 Fcheck_coding_system (val
);
709 /* In unibyte mode, character code conversion should not take
710 place but EOL conversion should. So, setup raw-text or one
711 of the subsidiary according to the information just setup. */
712 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
714 val
= raw_text_coding_system (val
);
715 setup_coding_system (val
, &process_coding
);
716 process_coding
.dst_multibyte
717 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
719 process_coding
.src_multibyte
= 0;
724 if (output_to_buffer
)
728 EMACS_INT total_read
= 0;
730 bool display_on_the_fly
= display_p
;
731 struct coding_system saved_coding
;
733 saved_coding
= process_coding
;
736 /* Repeatedly read until we've filled as much as possible
737 of the buffer size we have. But don't read
738 less than 1024--save that for the next bufferful. */
740 while (nread
< bufsize
- 1024)
742 int this_read
= emacs_read (fd
[0], buf
+ nread
,
750 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
755 total_read
+= this_read
;
757 if (display_on_the_fly
)
761 /* Now NREAD is the total amount of data in the buffer. */
766 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
767 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
768 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
770 { /* We have to decode the input. */
772 ptrdiff_t count1
= SPECPDL_INDEX ();
774 XSETBUFFER (curbuf
, current_buffer
);
775 /* We cannot allow after-change-functions be run
776 during decoding, because that might modify the
777 buffer, while we rely on process_coding.produced to
778 faithfully reflect inserted text until we
779 TEMP_SET_PT_BOTH below. */
780 specbind (Qinhibit_modification_hooks
, Qt
);
781 decode_coding_c_string (&process_coding
,
782 (unsigned char *) buf
, nread
, curbuf
);
783 unbind_to (count1
, Qnil
);
784 if (display_on_the_fly
785 && CODING_REQUIRE_DETECTION (&saved_coding
)
786 && ! CODING_REQUIRE_DETECTION (&process_coding
))
788 /* We have detected some coding system. But,
789 there's a possibility that the detection was
790 done by insufficient data. So, we give up
791 displaying on the fly. */
792 if (process_coding
.produced
> 0)
793 del_range_2 (process_coding
.dst_pos
,
794 process_coding
.dst_pos_byte
,
795 process_coding
.dst_pos
796 + process_coding
.produced_char
,
797 process_coding
.dst_pos_byte
798 + process_coding
.produced
, 0);
799 display_on_the_fly
= 0;
800 process_coding
= saved_coding
;
802 /* This is to make the above condition always
803 fails in the future. */
804 saved_coding
.common_flags
805 &= ~CODING_REQUIRE_DETECTION_MASK
;
809 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
810 PT_BYTE
+ process_coding
.produced
);
811 carryover
= process_coding
.carryover_bytes
;
813 memcpy (buf
, process_coding
.carryover
,
814 process_coding
.carryover_bytes
);
818 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
821 /* Make the buffer bigger as we continue to read more data,
822 but not past CALLPROC_BUFFER_SIZE_MAX. */
823 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
824 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
825 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
830 prepare_menu_bars ();
832 redisplay_preserve_echo_area (1);
833 /* This variable might have been set to 0 for code
834 detection. In that case, we set it back to 1 because
835 we should have already detected a coding system. */
836 display_on_the_fly
= 1;
843 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
844 /* If the caller required, let the buffer inherit the
845 coding-system used to decode the process output. */
846 if (inherit_process_coding_system
)
847 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
848 make_number (total_read
));
852 /* Wait for it to terminate, unless it already has. */
853 if (output_to_buffer
)
854 wait_for_termination (pid
);
856 interruptible_wait_for_termination (pid
);
861 /* Don't kill any children that the subprocess may have left behind
863 call_process_exited
= 1;
866 unbind_to (count
, Qnil
);
868 if (synch_process_termsig
)
872 synchronize_system_messages_locale ();
873 signame
= strsignal (synch_process_termsig
);
878 synch_process_death
= signame
;
881 if (synch_process_death
)
882 return code_convert_string_norecord (build_string (synch_process_death
),
883 Vlocale_coding_system
, 0);
884 return make_number (synch_process_retcode
);
888 delete_temp_file (Lisp_Object name
)
890 /* Suppress jka-compr handling, etc. */
891 ptrdiff_t count
= SPECPDL_INDEX ();
892 specbind (intern ("file-name-handler-alist"), Qnil
);
893 internal_delete_file (name
);
894 unbind_to (count
, Qnil
);
898 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
900 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
901 The remaining arguments are optional.
902 Delete the text if fourth arg DELETE is non-nil.
904 Insert output in BUFFER before point; t means current buffer; nil for
905 BUFFER means discard it; 0 means discard and don't wait; and `(:file
906 FILE)', where FILE is a file name string, means that it should be
907 written to that file (if the file already exists it is overwritten).
908 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
909 REAL-BUFFER says what to do with standard output, as above,
910 while STDERR-FILE says what to do with standard error in the child.
911 STDERR-FILE may be nil (discard standard error output),
912 t (mix it with ordinary output), or a file name string.
914 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
915 Remaining args are passed to PROGRAM at startup as command args.
917 If BUFFER is 0, `call-process-region' returns immediately with value nil.
918 Otherwise it waits for PROGRAM to terminate
919 and returns a numeric exit status or a signal description string.
920 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
922 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
923 (ptrdiff_t nargs
, Lisp_Object
*args
)
926 Lisp_Object filename_string
;
927 register Lisp_Object start
, end
;
928 ptrdiff_t count
= SPECPDL_INDEX ();
929 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
930 Lisp_Object coding_systems
;
931 Lisp_Object val
, *args2
;
935 if (STRINGP (Vtemporary_file_directory
))
936 tmpdir
= Vtemporary_file_directory
;
940 if (getenv ("TMPDIR"))
941 tmpdir
= build_string (getenv ("TMPDIR"));
943 tmpdir
= build_string ("/tmp/");
946 if ((outf
= egetenv ("TMPDIR"))
947 || (outf
= egetenv ("TMP"))
948 || (outf
= egetenv ("TEMP")))
949 tmpdir
= build_string (outf
);
951 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
957 Lisp_Object pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
958 char *tempfile
= SAFE_ALLOCA (SBYTES (pattern
) + 1);
959 memcpy (tempfile
, SDATA (pattern
), SBYTES (pattern
) + 1);
967 fd
= mkstemp (tempfile
);
970 report_file_error ("Failed to open temporary file",
971 Fcons (build_string (tempfile
), Qnil
));
979 filename_string
= build_string (tempfile
);
980 GCPRO1 (filename_string
);
986 /* Decide coding-system of the contents of the temporary file. */
987 if (!NILP (Vcoding_system_for_write
))
988 val
= Vcoding_system_for_write
;
989 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
994 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
995 args2
[0] = Qcall_process_region
;
996 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
997 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
998 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1001 val
= complement_process_encoding_system (val
);
1004 ptrdiff_t count1
= SPECPDL_INDEX ();
1006 specbind (intern ("coding-system-for-write"), val
);
1007 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1008 happen to get a ".Z" suffix. */
1009 specbind (intern ("file-name-handler-alist"), Qnil
);
1010 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
1012 unbind_to (count1
, Qnil
);
1015 /* Note that Fcall_process takes care of binding
1016 coding-system-for-read. */
1018 record_unwind_protect (delete_temp_file
, filename_string
);
1020 if (nargs
> 3 && !NILP (args
[3]))
1021 Fdelete_region (start
, end
);
1033 args
[1] = filename_string
;
1035 RETURN_UNGCPRO (unbind_to (count
, Fcall_process (nargs
, args
)));
1039 static int relocate_fd (int fd
, int minfd
);
1043 add_env (char **env
, char **new_env
, char *string
)
1050 /* See if this string duplicates any string already in the env.
1051 If so, don't put it in.
1052 When an env var has multiple definitions,
1053 we keep the definition that comes first in process-environment. */
1054 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1056 char *p
= *ep
, *q
= string
;
1062 /* The string is a lone variable name; keep it for now, we
1063 will remove it later. It is a placeholder for a
1064 variable that is not to be included in the environment. */
1072 *new_env
++ = string
;
1076 /* This is the last thing run in a newly forked inferior
1077 either synchronous or asynchronous.
1078 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1079 Initialize inferior's priority, pgrp, connected dir and environment.
1080 then exec another program based on new_argv.
1082 This function may change environ for the superior process.
1083 Therefore, the superior process must save and restore the value
1084 of environ around the vfork and the call to this function.
1086 If SET_PGRP, put the subprocess into a separate process group.
1088 CURRENT_DIR is an elisp string giving the path of the current
1089 directory the subprocess should have. Since we can't really signal
1090 a decent error from within the child, this should be verified as an
1091 executable directory by the parent. */
1094 child_setup (int in
, int out
, int err
, char **new_argv
, bool set_pgrp
,
1095 Lisp_Object current_dir
)
1102 #endif /* WINDOWSNT */
1104 pid_t pid
= getpid ();
1106 /* Close Emacs's descriptors that this process should not have. */
1107 close_process_descs ();
1109 /* DOS_NT isn't in a vfork, so if we are in the middle of load-file,
1110 we will lose if we call close_load_descs here. */
1112 close_load_descs ();
1115 /* Note that use of alloca is always safe here. It's obvious for systems
1116 that do not have true vfork or that have true (stack) alloca.
1117 If using vfork and C_ALLOCA (when Emacs used to include
1118 src/alloca.c) it is safe because that changes the superior's
1119 static variables as if the superior had done alloca and will be
1120 cleaned up in the usual way. */
1122 register char *temp
;
1123 size_t i
; /* size_t, because ptrdiff_t might overflow here! */
1125 i
= SBYTES (current_dir
);
1127 /* MSDOS must have all environment variables malloc'ed, because
1128 low-level libc functions that launch subsidiary processes rely
1130 pwd_var
= xmalloc (i
+ 6);
1132 pwd_var
= alloca (i
+ 6);
1135 memcpy (pwd_var
, "PWD=", 4);
1136 memcpy (temp
, SDATA (current_dir
), i
);
1137 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
1141 /* We can't signal an Elisp error here; we're in a vfork. Since
1142 the callers check the current directory before forking, this
1143 should only return an error if the directory's permissions
1144 are changed between the check and this chdir, but we should
1146 if (chdir (temp
) < 0)
1149 /* Get past the drive letter, so that d:/ is left alone. */
1150 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1157 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1158 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1162 /* Set `env' to a vector of the strings in the environment. */
1164 register Lisp_Object tem
;
1165 register char **new_env
;
1167 register int new_length
;
1168 Lisp_Object display
= Qnil
;
1172 for (tem
= Vprocess_environment
;
1173 CONSP (tem
) && STRINGP (XCAR (tem
));
1176 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1177 && (SDATA (XCAR (tem
)) [7] == '\0'
1178 || SDATA (XCAR (tem
)) [7] == '='))
1179 /* DISPLAY is specified in process-environment. */
1184 /* If not provided yet, use the frame's DISPLAY. */
1187 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1188 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1189 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1190 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1191 Vinitial_environment
);
1199 /* new_length + 2 to include PWD and terminating 0. */
1200 env
= new_env
= alloca ((new_length
+ 2) * sizeof *env
);
1201 /* If we have a PWD envvar, pass one down,
1202 but with corrected value. */
1203 if (egetenv ("PWD"))
1204 *new_env
++ = pwd_var
;
1206 if (STRINGP (display
))
1208 char *vdata
= alloca (sizeof "DISPLAY=" + SBYTES (display
));
1209 strcpy (vdata
, "DISPLAY=");
1210 strcat (vdata
, SSDATA (display
));
1211 new_env
= add_env (env
, new_env
, vdata
);
1215 for (tem
= Vprocess_environment
;
1216 CONSP (tem
) && STRINGP (XCAR (tem
));
1218 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1222 /* Remove variable names without values. */
1226 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1236 prepare_standard_handles (in
, out
, err
, handles
);
1237 set_process_dir (SDATA (current_dir
));
1238 /* Spawn the child. (See ntproc.c:Spawnve). */
1239 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1240 reset_standard_handles (in
, out
, err
, handles
);
1242 /* An error occurred while trying to spawn the process. */
1243 report_file_error ("Spawning child process", Qnil
);
1246 #else /* not WINDOWSNT */
1247 /* Make sure that in, out, and err are not actually already in
1248 descriptors zero, one, or two; this could happen if Emacs is
1249 started with its standard in, out, or error closed, as might
1252 int oin
= in
, oout
= out
;
1254 /* We have to avoid relocating the same descriptor twice! */
1256 in
= relocate_fd (in
, 3);
1261 out
= relocate_fd (out
, 3);
1265 else if (err
== oout
)
1268 err
= relocate_fd (err
, 3);
1282 if (err
!= in
&& err
!= out
)
1288 /* execvp does not accept an environment arg so the only way
1289 to pass this environment is to set environ. Our caller
1290 is responsible for restoring the ambient value of environ. */
1292 execvp (new_argv
[0], new_argv
);
1294 emacs_write (1, "Can't exec program: ", 20);
1295 emacs_write (1, new_argv
[0], strlen (new_argv
[0]));
1296 emacs_write (1, "\n", 1);
1300 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1303 /* An error occurred while trying to run the subprocess. */
1304 report_file_error ("Spawning child process", Qnil
);
1307 #endif /* not WINDOWSNT */
1311 /* Move the file descriptor FD so that its number is not less than MINFD.
1312 If the file descriptor is moved at all, the original is freed. */
1314 relocate_fd (int fd
, int minfd
)
1322 new = fcntl (fd
, F_DUPFD
, minfd
);
1326 /* Note that we hold the original FD open while we recurse,
1327 to guarantee we'll get a new FD if we need it. */
1328 new = relocate_fd (new, minfd
);
1332 const char *message_1
= "Error while setting up child: ";
1333 const char *errmessage
= strerror (errno
);
1334 const char *message_2
= "\n";
1335 emacs_write (2, message_1
, strlen (message_1
));
1336 emacs_write (2, errmessage
, strlen (errmessage
));
1337 emacs_write (2, message_2
, strlen (message_2
));
1344 #endif /* not WINDOWSNT */
1347 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1348 ptrdiff_t *valuelen
, Lisp_Object env
)
1350 for (; CONSP (env
); env
= XCDR (env
))
1352 Lisp_Object entry
= XCAR (env
);
1354 && SBYTES (entry
) >= varlen
1356 /* NT environment variables are case insensitive. */
1357 && ! strnicmp (SDATA (entry
), var
, varlen
)
1358 #else /* not WINDOWSNT */
1359 && ! memcmp (SDATA (entry
), var
, varlen
)
1360 #endif /* not WINDOWSNT */
1363 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1365 *value
= SSDATA (entry
) + (varlen
+ 1);
1366 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1369 else if (SBYTES (entry
) == varlen
)
1371 /* Lone variable names in Vprocess_environment mean that
1372 variable should be removed from the environment. */
1382 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1383 ptrdiff_t *valuelen
, Lisp_Object frame
)
1385 /* Try to find VAR in Vprocess_environment first. */
1386 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1387 Vprocess_environment
))
1388 return *value
? 1 : 0;
1390 /* For DISPLAY try to get the values from the frame or the initial env. */
1391 if (strcmp (var
, "DISPLAY") == 0)
1394 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1395 if (STRINGP (display
))
1397 *value
= SSDATA (display
);
1398 *valuelen
= SBYTES (display
);
1401 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1402 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1403 Vinitial_environment
))
1404 return *value
? 1 : 0;
1410 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1411 doc
: /* Get the value of environment variable VARIABLE.
1412 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1413 the environment. Otherwise, value is a string.
1415 This function searches `process-environment' for VARIABLE.
1417 If optional parameter ENV is a list, then search this list instead of
1418 `process-environment', and return t when encountering a negative entry
1419 \(an entry for a variable with no value). */)
1420 (Lisp_Object variable
, Lisp_Object env
)
1425 CHECK_STRING (variable
);
1428 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1429 &value
, &valuelen
, env
))
1430 return value
? make_string (value
, valuelen
) : Qt
;
1434 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1435 &value
, &valuelen
, env
))
1436 return make_string (value
, valuelen
);
1441 /* A version of getenv that consults the Lisp environment lists,
1442 easily callable from C. */
1444 egetenv (const char *var
)
1449 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1456 /* This is run before init_cmdargs. */
1459 init_callproc_1 (void)
1462 const char *etc_dir
= ns_etc_directory ();
1463 const char *path_exec
= ns_exec_path ();
1466 Vdata_directory
= decode_env_path ("EMACSDATA",
1471 Vdata_directory
= Ffile_name_as_directory (Fcar (Vdata_directory
));
1473 Vdoc_directory
= decode_env_path ("EMACSDOC",
1478 Vdoc_directory
= Ffile_name_as_directory (Fcar (Vdoc_directory
));
1480 /* Check the EMACSPATH environment variable, defaulting to the
1481 PATH_EXEC path from epaths.h. */
1482 Vexec_path
= decode_env_path ("EMACSPATH",
1484 path_exec
? path_exec
:
1487 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1488 /* FIXME? For ns, path_exec should go at the front? */
1489 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1492 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1495 init_callproc (void)
1497 char *data_dir
= egetenv ("EMACSDATA");
1500 Lisp_Object tempdir
;
1504 const char *etc_dir
= ns_etc_directory ();
1507 data_dir
= alloca (strlen (etc_dir
) + 1);
1508 strcpy (data_dir
, etc_dir
);
1513 if (!NILP (Vinstallation_directory
))
1515 /* Add to the path the lib-src subdir of the installation dir. */
1517 tem
= Fexpand_file_name (build_string ("lib-src"),
1518 Vinstallation_directory
);
1520 /* MSDOS uses wrapped binaries, so don't do this. */
1521 if (NILP (Fmember (tem
, Vexec_path
)))
1524 const char *path_exec
= ns_exec_path ();
1526 Vexec_path
= decode_env_path ("EMACSPATH",
1528 path_exec
? path_exec
:
1531 Vexec_path
= Fcons (tem
, Vexec_path
);
1532 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1535 Vexec_directory
= Ffile_name_as_directory (tem
);
1536 #endif /* not MSDOS */
1538 /* Maybe use ../etc as well as ../lib-src. */
1541 tem
= Fexpand_file_name (build_string ("etc"),
1542 Vinstallation_directory
);
1543 Vdoc_directory
= Ffile_name_as_directory (tem
);
1547 /* Look for the files that should be in etc. We don't use
1548 Vinstallation_directory, because these files are never installed
1549 near the executable, and they are never in the build
1550 directory when that's different from the source directory.
1552 Instead, if these files are not in the nominal place, we try the
1553 source directory. */
1556 Lisp_Object tem
, tem1
, srcdir
;
1558 srcdir
= Fexpand_file_name (build_string ("../src/"),
1559 build_string (PATH_DUMPLOADSEARCH
));
1560 tem
= Fexpand_file_name (build_string ("GNU"), 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/"),
1566 build_string (PATH_DUMPLOADSEARCH
));
1567 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1568 tem1
= Ffile_exists_p (tem
);
1570 Vdata_directory
= newdir
;
1578 tempdir
= Fdirectory_file_name (Vexec_directory
);
1579 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1580 dir_warning ("arch-dependent data dir", Vexec_directory
);
1583 tempdir
= Fdirectory_file_name (Vdata_directory
);
1584 if (! file_accessible_directory_p (SSDATA (tempdir
)))
1585 dir_warning ("arch-independent data dir", Vdata_directory
);
1587 sh
= (char *) getenv ("SHELL");
1588 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1591 Vshared_game_score_directory
= Qnil
;
1593 Vshared_game_score_directory
= build_string (PATH_GAME
);
1594 if (NILP (Ffile_accessible_directory_p (Vshared_game_score_directory
)))
1595 Vshared_game_score_directory
= Qnil
;
1600 set_initial_environment (void)
1603 for (envp
= environ
; *envp
; envp
++)
1604 Vprocess_environment
= Fcons (build_string (*envp
),
1605 Vprocess_environment
);
1606 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1607 to use `delete' and friends on process-environment. */
1608 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1612 syms_of_callproc (void)
1615 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1616 #elif defined (WINDOWSNT)
1617 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1619 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1621 staticpro (&Vtemp_file_name_pattern
);
1623 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1624 doc
: /* File name to load inferior shells from.
1625 Initialized from the SHELL environment variable, or to a system-dependent
1626 default if SHELL is not set. */);
1628 DEFVAR_LISP ("exec-path", Vexec_path
,
1629 doc
: /* List of directories to search programs to run in subprocesses.
1630 Each element is a string (directory name) or nil (try default directory). */);
1632 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1633 doc
: /* List of suffixes to try to find executable file names.
1634 Each element is a string. */);
1635 Vexec_suffixes
= Qnil
;
1637 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1638 doc
: /* Directory for executables for Emacs to invoke.
1639 More generally, this includes any architecture-dependent files
1640 that are built and installed from the Emacs distribution. */);
1642 DEFVAR_LISP ("data-directory", Vdata_directory
,
1643 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1644 These are files intended for Emacs to use while it runs. */);
1646 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1647 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1648 This is usually the same as `data-directory'. */);
1650 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1651 doc
: /* For internal use by the build procedure only.
1652 This is the name of the directory in which the build procedure installed
1653 Emacs's info files; the default value for `Info-default-directory-list'
1655 Vconfigure_info_directory
= build_string (PATH_INFO
);
1657 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1658 doc
: /* Directory of score files for games which come with GNU Emacs.
1659 If this variable is nil, then Emacs is unable to use a shared directory. */);
1661 Vshared_game_score_directory
= Qnil
;
1663 Vshared_game_score_directory
= build_string (PATH_GAME
);
1666 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1667 doc
: /* List of environment variables inherited from the parent process.
1668 Each element should be a string of the form ENVVARNAME=VALUE.
1669 The elements must normally be decoded (using `locale-coding-system') for use. */);
1670 Vinitial_environment
= Qnil
;
1672 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1673 doc
: /* List of overridden environment variables for subprocesses to inherit.
1674 Each element should be a string of the form ENVVARNAME=VALUE.
1676 Entries in this list take precedence to those in the frame-local
1677 environments. Therefore, let-binding `process-environment' is an easy
1678 way to temporarily change the value of an environment variable,
1679 irrespective of where it comes from. To use `process-environment' to
1680 remove an environment variable, include only its name in the list,
1683 This variable is set to nil when Emacs starts.
1685 If multiple entries define the same variable, the first one always
1688 Non-ASCII characters are encoded according to the initial value of
1689 `locale-coding-system', i.e. the elements must normally be decoded for
1692 See `setenv' and `getenv'. */);
1693 Vprocess_environment
= Qnil
;
1695 defsubr (&Scall_process
);
1696 defsubr (&Sgetenv_internal
);
1697 defsubr (&Scall_process_region
);