1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2011
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/>. */
26 #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>
47 #include "character.h"
50 #include "composite.h"
53 #include "syssignal.h"
55 #include "blockinput.h"
57 #include "termhooks.h"
64 extern char **environ
;
70 #define setpgrp setpgid
74 /* Pattern used by call-process-region to make temp files. */
75 static Lisp_Object Vtemp_file_name_pattern
;
77 /* True if we are about to fork off a synchronous process or if we
78 are waiting for it. */
79 int synch_process_alive
;
81 /* Nonzero => this is a string explaining death of synchronous subprocess. */
82 const char *synch_process_death
;
84 /* Nonzero => this is the signal number that terminated the subprocess. */
85 int synch_process_termsig
;
87 /* If synch_process_death is zero,
88 this is exit code of synchronous subprocess. */
89 int synch_process_retcode
;
92 /* Clean up when exiting Fcall_process.
93 On MSDOS, delete the temporary file on any kind of termination.
94 On Unix, kill the process and any children on termination by signal. */
96 /* Nonzero if this is termination due to exit. */
97 static int call_process_exited
;
99 static Lisp_Object
Fgetenv_internal (Lisp_Object
, Lisp_Object
);
102 call_process_kill (Lisp_Object fdpid
)
104 emacs_close (XFASTINT (Fcar (fdpid
)));
105 EMACS_KILLPG (XFASTINT (Fcdr (fdpid
)), SIGKILL
);
106 synch_process_alive
= 0;
111 call_process_cleanup (Lisp_Object arg
)
113 Lisp_Object fdpid
= Fcdr (arg
);
120 Fset_buffer (Fcar (arg
));
123 /* for MSDOS fdpid is really (fd . tempfile) */
125 emacs_close (XFASTINT (Fcar (fdpid
)));
126 if (strcmp (SDATA (file
), NULL_DEVICE
) != 0)
127 unlink (SDATA (file
));
128 #else /* not MSDOS */
129 pid
= XFASTINT (Fcdr (fdpid
));
131 if (call_process_exited
)
133 emacs_close (XFASTINT (Fcar (fdpid
)));
137 if (EMACS_KILLPG (pid
, SIGINT
) == 0)
139 int 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;
150 emacs_close (XFASTINT (Fcar (fdpid
)));
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 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
163 REAL-BUFFER says what to do with standard output, as above,
164 while STDERR-FILE says what to do with standard error in the child.
165 STDERR-FILE may be nil (discard standard error output),
166 t (mix it with ordinary output), or a file name string.
168 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
169 Remaining arguments are strings passed as command arguments to PROGRAM.
171 If executable PROGRAM can't be found as an executable, `call-process'
172 signals a Lisp error. `call-process' reports errors in execution of
173 the program only through its return and output.
175 If BUFFER is 0, `call-process' returns immediately with value nil.
176 Otherwise it waits for PROGRAM to terminate
177 and returns a numeric exit status or a signal description string.
178 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
180 usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS) */)
181 (size_t nargs
, register Lisp_Object
*args
)
183 Lisp_Object infile
, buffer
, current_dir
, path
;
184 volatile int display_p_volatile
;
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 int count
= SPECPDL_INDEX ();
193 volatile USE_SAFE_ALLOCA
;
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
;
205 struct coding_system process_coding
; /* coding-system of process output */
206 struct coding_system argument_coding
; /* coding-system of arguments */
207 /* Set to the return value of Ffind_operation_coding_system. */
208 Lisp_Object coding_systems
;
209 int output_to_buffer
= 1;
211 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
214 CHECK_STRING (args
[0]);
219 /* Without asynchronous processes we cannot have BUFFER == 0. */
221 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
222 error ("Operating system cannot handle asynchronous subprocesses");
223 #endif /* subprocesses */
225 /* Decide the coding-system for giving arguments. */
227 Lisp_Object val
, *args2
;
230 /* If arguments are supplied, we may have to encode them. */
234 Lisp_Object coding_attrs
;
236 for (i
= 4; i
< nargs
; i
++)
237 CHECK_STRING (args
[i
]);
239 for (i
= 4; i
< nargs
; i
++)
240 if (STRING_MULTIBYTE (args
[i
]))
243 if (!NILP (Vcoding_system_for_write
))
244 val
= Vcoding_system_for_write
;
245 else if (! must_encode
)
249 SAFE_ALLOCA (args2
, Lisp_Object
*, (nargs
+ 1) * sizeof *args2
);
250 args2
[0] = Qcall_process
;
251 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
252 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
253 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
255 val
= complement_process_encoding_system (val
);
256 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
257 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
258 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
260 /* We should not use an ASCII incompatible coding system. */
261 val
= raw_text_coding_system (val
);
262 setup_coding_system (val
, &argument_coding
);
267 if (nargs
>= 2 && ! NILP (args
[1]))
269 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
270 CHECK_STRING (infile
);
273 infile
= build_string (NULL_DEVICE
);
279 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
280 FILE-FOR-STDERR), unless the first element is :file, in which case see
281 the next paragraph. */
283 && (! SYMBOLP (XCAR (buffer
))
284 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file")))
286 if (CONSP (XCDR (buffer
)))
288 Lisp_Object stderr_file
;
289 stderr_file
= XCAR (XCDR (buffer
));
291 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
292 error_file
= stderr_file
;
294 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
297 buffer
= XCAR (buffer
);
300 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
302 && SYMBOLP (XCAR (buffer
))
303 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file"))
305 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
306 BVAR (current_buffer
, directory
));
307 CHECK_STRING (output_file
);
311 if (!(EQ (buffer
, Qnil
)
313 || INTEGERP (buffer
)))
315 Lisp_Object spec_buffer
;
316 spec_buffer
= buffer
;
317 buffer
= Fget_buffer_create (buffer
);
318 /* Mention the buffer name for a better error message. */
320 CHECK_BUFFER (spec_buffer
);
321 CHECK_BUFFER (buffer
);
327 /* Make sure that the child will be able to chdir to the current
328 buffer's current directory, or its unhandled equivalent. We
329 can't just have the child check for an error when it does the
330 chdir, since it's in a vfork.
332 We have to GCPRO around this because Fexpand_file_name,
333 Funhandled_file_name_directory, and Ffile_accessible_directory_p
334 might call a file name handling function. The argument list is
335 protected by the caller, so all we really have to worry about is
338 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
340 current_dir
= BVAR (current_buffer
, directory
);
342 GCPRO5 (infile
, buffer
, current_dir
, error_file
, output_file
);
344 current_dir
= Funhandled_file_name_directory (current_dir
);
345 if (NILP (current_dir
))
346 /* If the file name handler says that current_dir is unreachable, use
347 a sensible default. */
348 current_dir
= build_string ("~/");
349 current_dir
= expand_and_dir_to_file (current_dir
, Qnil
);
350 current_dir
= Ffile_name_as_directory (current_dir
);
352 if (NILP (Ffile_accessible_directory_p (current_dir
)))
353 report_file_error ("Setting current directory",
354 Fcons (BVAR (current_buffer
, directory
), Qnil
));
356 if (STRING_MULTIBYTE (infile
))
357 infile
= ENCODE_FILE (infile
);
358 if (STRING_MULTIBYTE (current_dir
))
359 current_dir
= ENCODE_FILE (current_dir
);
360 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
361 error_file
= ENCODE_FILE (error_file
);
362 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
363 output_file
= ENCODE_FILE (output_file
);
367 display_p_volatile
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
369 filefd
= emacs_open (SSDATA (infile
), O_RDONLY
, 0);
372 infile
= DECODE_FILE (infile
);
373 report_file_error ("Opening process input file", Fcons (infile
, Qnil
));
376 if (STRINGP (output_file
))
379 fd_output
= emacs_open (SSDATA (output_file
),
380 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
382 #else /* not DOS_NT */
383 fd_output
= creat (SSDATA (output_file
), 0666);
384 #endif /* not DOS_NT */
387 output_file
= DECODE_FILE (output_file
);
388 report_file_error ("Opening process output file",
389 Fcons (output_file
, Qnil
));
391 if (STRINGP (error_file
) || NILP (error_file
))
392 output_to_buffer
= 0;
395 /* Search for program; barf if not found. */
397 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
399 GCPRO4 (infile
, buffer
, current_dir
, error_file
);
400 openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
405 emacs_close (filefd
);
406 report_file_error ("Searching for program", Fcons (args
[0], Qnil
));
409 /* If program file name starts with /: for quoting a magic name,
411 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
412 && SREF (path
, 1) == ':')
413 path
= Fsubstring (path
, make_number (2), Qnil
);
415 SAFE_ALLOCA (new_argv
, const unsigned char **,
416 (nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
420 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
422 GCPRO5 (infile
, buffer
, current_dir
, path
, error_file
);
423 argument_coding
.dst_multibyte
= 0;
424 for (i
= 4; i
< nargs
; i
++)
426 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
427 if (CODING_REQUIRE_ENCODING (&argument_coding
))
428 /* We must encode this argument. */
429 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
432 for (i
= 4; i
< nargs
; i
++)
433 new_argv
[i
- 3] = SDATA (args
[i
]);
438 new_argv
[0] = SDATA (path
);
440 #ifdef MSDOS /* MW, July 1993 */
441 if ((outf
= egetenv ("TMPDIR")))
442 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
445 tempfile
= alloca (20);
448 dostounix_filename (tempfile
);
449 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
450 strcat (tempfile
, "/");
451 strcat (tempfile
, "detmp.XXX");
454 /* If we're redirecting STDOUT to a file, this is already opened. */
457 outfilefd
= creat (tempfile
, S_IREAD
| S_IWRITE
);
459 emacs_close (filefd
);
460 report_file_error ("Opening process output file",
461 Fcons (build_string (tempfile
), Qnil
));
465 outfilefd
= fd_output
;
470 if (INTEGERP (buffer
))
471 fd
[1] = emacs_open (NULL_DEVICE
, O_WRONLY
, 0), fd
[0] = -1;
478 emacs_close (filefd
);
479 report_file_error ("Creating process pipe", Qnil
);
485 /* child_setup must clobber environ in systems with true vfork.
486 Protect it from permanent change. */
487 register char **save_environ
= environ
;
488 register int fd1
= fd
[1];
490 #ifdef HAVE_WORKING_VFORK
493 struct sigaction sigpipe_action
;
498 #if 0 /* Some systems don't have sigblock. */
499 mask
= sigblock (sigmask (SIGCHLD
));
502 /* Record that we're about to create a synchronous process. */
503 synch_process_alive
= 1;
505 /* These vars record information from process termination.
506 Clear them now before process can possibly terminate,
507 to avoid timing error if process terminates soon. */
508 synch_process_death
= 0;
509 synch_process_retcode
= 0;
510 synch_process_termsig
= 0;
512 if (NILP (error_file
))
513 fd_error
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
514 else if (STRINGP (error_file
))
517 fd_error
= emacs_open (SSDATA (error_file
),
518 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
520 #else /* not DOS_NT */
521 fd_error
= creat (SSDATA (error_file
), 0666);
522 #endif /* not DOS_NT */
527 emacs_close (filefd
);
535 if (NILP (error_file
))
536 error_file
= build_string (NULL_DEVICE
);
537 else if (STRINGP (error_file
))
538 error_file
= DECODE_FILE (error_file
);
539 report_file_error ("Cannot redirect stderr", Fcons (error_file
, Qnil
));
542 #ifdef MSDOS /* MW, July 1993 */
543 /* Note that on MSDOS `child_setup' actually returns the child process
544 exit status, not its PID, so we assign it to `synch_process_retcode'
546 pid
= child_setup (filefd
, outfilefd
, fd_error
, (char **) new_argv
,
549 /* Record that the synchronous process exited and note its
550 termination status. */
551 synch_process_alive
= 0;
552 synch_process_retcode
= pid
;
553 if (synch_process_retcode
< 0) /* means it couldn't be exec'ed */
555 synchronize_system_messages_locale ();
556 synch_process_death
= strerror (errno
);
559 emacs_close (outfilefd
);
560 if (fd_error
!= outfilefd
)
561 emacs_close (fd_error
);
562 fd1
= -1; /* No harm in closing that one! */
563 /* Since CRLF is converted to LF within `decode_coding', we can
564 always open a file with binary mode. */
565 fd
[0] = emacs_open (tempfile
, O_RDONLY
| O_BINARY
, 0);
569 emacs_close (filefd
);
570 report_file_error ("Cannot re-open temporary file", Qnil
);
572 #else /* not MSDOS */
574 pid
= child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
576 #else /* not WINDOWSNT */
578 #ifdef HAVE_WORKING_VFORK
579 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
580 this sets the parent's signal handlers as well as the child's.
581 So delay all interrupts whose handlers the child might munge,
582 and record the current handlers so they can be restored later. */
583 sigemptyset (&blocked
);
584 sigaddset (&blocked
, SIGPIPE
);
585 sigaction (SIGPIPE
, 0, &sigpipe_action
);
586 sigprocmask (SIG_BLOCK
, &blocked
, &procmask
);
591 /* vfork, and prevent local vars from being clobbered by the vfork. */
593 int volatile fd_error_volatile
= fd_error
;
594 int volatile fd_output_volatile
= fd_output
;
595 int volatile output_to_buffer_volatile
= output_to_buffer
;
596 unsigned char const **volatile new_argv_volatile
= new_argv
;
600 fd_error
= fd_error_volatile
;
601 fd_output
= fd_output_volatile
;
602 output_to_buffer
= output_to_buffer_volatile
;
603 new_argv
= new_argv_volatile
;
619 /* GConf causes us to ignore SIGPIPE, make sure it is restored
621 //signal (SIGPIPE, SIG_DFL);
622 #ifdef HAVE_WORKING_VFORK
623 sigprocmask (SIG_SETMASK
, &procmask
, 0);
626 child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
632 #ifdef HAVE_WORKING_VFORK
633 /* Restore the signal state. */
634 sigaction (SIGPIPE
, &sigpipe_action
, 0);
635 sigprocmask (SIG_SETMASK
, &procmask
, 0);
638 #endif /* not WINDOWSNT */
640 /* The MSDOS case did this already. */
642 emacs_close (fd_error
);
643 #endif /* not MSDOS */
645 environ
= save_environ
;
647 /* Close most of our fd's, but not fd[0]
648 since we will use that to read input from. */
649 emacs_close (filefd
);
651 emacs_close (fd_output
);
652 if (fd1
>= 0 && fd1
!= fd_error
)
660 report_file_error ("Doing vfork", Qnil
);
663 if (INTEGERP (buffer
))
670 /* Enable sending signal if user quits below. */
671 call_process_exited
= 0;
674 /* MSDOS needs different cleanup information. */
675 record_unwind_protect (call_process_cleanup
,
676 Fcons (Fcurrent_buffer (),
677 Fcons (make_number (fd
[0]),
678 build_string (tempfile
))));
680 record_unwind_protect (call_process_cleanup
,
681 Fcons (Fcurrent_buffer (),
682 Fcons (make_number (fd
[0]), make_number (pid
))));
683 #endif /* not MSDOS */
686 if (BUFFERP (buffer
))
687 Fset_buffer (buffer
);
691 /* If BUFFER is nil, we must read process output once and then
692 discard it, so setup coding system but with nil. */
693 setup_coding_system (Qnil
, &process_coding
);
697 Lisp_Object val
, *args2
;
700 if (!NILP (Vcoding_system_for_read
))
701 val
= Vcoding_system_for_read
;
704 if (EQ (coding_systems
, Qt
))
708 SAFE_ALLOCA (args2
, Lisp_Object
*, (nargs
+ 1) * sizeof *args2
);
709 args2
[0] = Qcall_process
;
710 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
712 = Ffind_operation_coding_system (nargs
+ 1, args2
);
714 if (CONSP (coding_systems
))
715 val
= XCAR (coding_systems
);
716 else if (CONSP (Vdefault_process_coding_system
))
717 val
= XCAR (Vdefault_process_coding_system
);
721 Fcheck_coding_system (val
);
722 /* In unibyte mode, character code conversion should not take
723 place but EOL conversion should. So, setup raw-text or one
724 of the subsidiary according to the information just setup. */
725 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
727 val
= raw_text_coding_system (val
);
728 setup_coding_system (val
, &process_coding
);
734 if (output_to_buffer
)
736 register EMACS_INT nread
;
738 EMACS_INT total_read
= 0;
740 int display_p
= display_p_volatile
;
741 int display_on_the_fly
= display_p
;
742 struct coding_system saved_coding
;
744 saved_coding
= process_coding
;
747 /* Repeatedly read until we've filled as much as possible
748 of the buffer size we have. But don't read
749 less than 1024--save that for the next bufferful. */
751 while (nread
< bufsize
- 1024)
753 int this_read
= emacs_read (fd
[0], buf
+ nread
,
761 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
766 total_read
+= this_read
;
768 if (display_on_the_fly
)
772 /* Now NREAD is the total amount of data in the buffer. */
777 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
778 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
779 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
781 { /* We have to decode the input. */
783 int count1
= SPECPDL_INDEX ();
785 XSETBUFFER (curbuf
, current_buffer
);
786 /* We cannot allow after-change-functions be run
787 during decoding, because that might modify the
788 buffer, while we rely on process_coding.produced to
789 faithfully reflect inserted text until we
790 TEMP_SET_PT_BOTH below. */
791 specbind (Qinhibit_modification_hooks
, Qt
);
792 decode_coding_c_string (&process_coding
,
793 (unsigned char *) buf
, nread
, curbuf
);
794 unbind_to (count1
, Qnil
);
795 if (display_on_the_fly
796 && CODING_REQUIRE_DETECTION (&saved_coding
)
797 && ! CODING_REQUIRE_DETECTION (&process_coding
))
799 /* We have detected some coding system. But,
800 there's a possibility that the detection was
801 done by insufficient data. So, we give up
802 displaying on the fly. */
803 if (process_coding
.produced
> 0)
804 del_range_2 (process_coding
.dst_pos
,
805 process_coding
.dst_pos_byte
,
806 process_coding
.dst_pos
807 + process_coding
.produced_char
,
808 process_coding
.dst_pos_byte
809 + process_coding
.produced
, 0);
810 display_on_the_fly
= 0;
811 process_coding
= saved_coding
;
813 /* This is to make the above condition always
814 fails in the future. */
815 saved_coding
.common_flags
816 &= ~CODING_REQUIRE_DETECTION_MASK
;
820 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
821 PT_BYTE
+ process_coding
.produced
);
822 carryover
= process_coding
.carryover_bytes
;
824 memcpy (buf
, process_coding
.carryover
,
825 process_coding
.carryover_bytes
);
829 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
832 /* Make the buffer bigger as we continue to read more data,
833 but not past CALLPROC_BUFFER_SIZE_MAX. */
834 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
835 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
836 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
841 prepare_menu_bars ();
843 redisplay_preserve_echo_area (1);
844 /* This variable might have been set to 0 for code
845 detection. In that case, we set it back to 1 because
846 we should have already detected a coding system. */
847 display_on_the_fly
= 1;
854 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
855 /* If the caller required, let the buffer inherit the
856 coding-system used to decode the process output. */
857 if (inherit_process_coding_system
)
858 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
859 make_number (total_read
));
863 /* Wait for it to terminate, unless it already has. */
864 if (output_to_buffer
)
865 wait_for_termination (pid
);
867 interruptible_wait_for_termination (pid
);
872 /* Don't kill any children that the subprocess may have left behind
874 call_process_exited
= 1;
877 unbind_to (count
, Qnil
);
879 if (synch_process_termsig
)
883 synchronize_system_messages_locale ();
884 signame
= strsignal (synch_process_termsig
);
889 synch_process_death
= signame
;
892 if (synch_process_death
)
893 return code_convert_string_norecord (build_string (synch_process_death
),
894 Vlocale_coding_system
, 0);
895 return make_number (synch_process_retcode
);
899 delete_temp_file (Lisp_Object name
)
901 /* Suppress jka-compr handling, etc. */
902 int count
= SPECPDL_INDEX ();
903 specbind (intern ("file-name-handler-alist"), Qnil
);
904 internal_delete_file (name
);
905 unbind_to (count
, Qnil
);
909 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
911 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
912 The remaining arguments are optional.
913 Delete the text if fourth arg DELETE is non-nil.
915 Insert output in BUFFER before point; t means current buffer; nil for
916 BUFFER means discard it; 0 means discard and don't wait; and `(:file
917 FILE)', where FILE is a file name string, means that it should be
918 written to that file.
919 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
920 REAL-BUFFER says what to do with standard output, as above,
921 while STDERR-FILE says what to do with standard error in the child.
922 STDERR-FILE may be nil (discard standard error output),
923 t (mix it with ordinary output), or a file name string.
925 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
926 Remaining args are passed to PROGRAM at startup as command args.
928 If BUFFER is 0, `call-process-region' returns immediately with value nil.
929 Otherwise it waits for PROGRAM to terminate
930 and returns a numeric exit status or a signal description string.
931 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
933 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
934 (size_t nargs
, register Lisp_Object
*args
)
937 Lisp_Object filename_string
;
938 register Lisp_Object start
, end
;
939 int count
= SPECPDL_INDEX ();
940 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
941 Lisp_Object coding_systems
;
942 Lisp_Object val
, *args2
;
945 Lisp_Object tmpdir
, pattern
;
947 if (STRINGP (Vtemporary_file_directory
))
948 tmpdir
= Vtemporary_file_directory
;
952 if (getenv ("TMPDIR"))
953 tmpdir
= build_string (getenv ("TMPDIR"));
955 tmpdir
= build_string ("/tmp/");
958 if ((outf
= egetenv ("TMPDIR"))
959 || (outf
= egetenv ("TMP"))
960 || (outf
= egetenv ("TEMP")))
961 tmpdir
= build_string (outf
);
963 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
969 pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
970 SAFE_ALLOCA (tempfile
, char *, SBYTES (pattern
) + 1);
971 memcpy (tempfile
, SDATA (pattern
), SBYTES (pattern
) + 1);
979 fd
= mkstemp (tempfile
);
982 report_file_error ("Failed to open temporary file",
983 Fcons (Vtemp_file_name_pattern
, Qnil
));
991 filename_string
= build_string (tempfile
);
992 GCPRO1 (filename_string
);
998 /* Decide coding-system of the contents of the temporary file. */
999 if (!NILP (Vcoding_system_for_write
))
1000 val
= Vcoding_system_for_write
;
1001 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1006 SAFE_ALLOCA (args2
, Lisp_Object
*, (nargs
+ 1) * sizeof *args2
);
1007 args2
[0] = Qcall_process_region
;
1008 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1009 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1010 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1013 val
= complement_process_encoding_system (val
);
1016 int count1
= SPECPDL_INDEX ();
1018 specbind (intern ("coding-system-for-write"), val
);
1019 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1020 happen to get a ".Z" suffix. */
1021 specbind (intern ("file-name-handler-alist"), Qnil
);
1022 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
1024 unbind_to (count1
, Qnil
);
1027 /* Note that Fcall_process takes care of binding
1028 coding-system-for-read. */
1030 record_unwind_protect (delete_temp_file
, filename_string
);
1032 if (nargs
> 3 && !NILP (args
[3]))
1033 Fdelete_region (start
, end
);
1045 args
[1] = filename_string
;
1047 RETURN_UNGCPRO (unbind_to (count
, Fcall_process (nargs
, args
)));
1051 static int relocate_fd (int fd
, int minfd
);
1055 add_env (char **env
, char **new_env
, char *string
)
1062 /* See if this string duplicates any string already in the env.
1063 If so, don't put it in.
1064 When an env var has multiple definitions,
1065 we keep the definition that comes first in process-environment. */
1066 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1068 char *p
= *ep
, *q
= string
;
1074 /* The string is a lone variable name; keep it for now, we
1075 will remove it later. It is a placeholder for a
1076 variable that is not to be included in the environment. */
1084 *new_env
++ = string
;
1088 /* This is the last thing run in a newly forked inferior
1089 either synchronous or asynchronous.
1090 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1091 Initialize inferior's priority, pgrp, connected dir and environment.
1092 then exec another program based on new_argv.
1094 This function may change environ for the superior process.
1095 Therefore, the superior process must save and restore the value
1096 of environ around the vfork and the call to this function.
1098 SET_PGRP is nonzero if we should put the subprocess into a separate
1101 CURRENT_DIR is an elisp string giving the path of the current
1102 directory the subprocess should have. Since we can't really signal
1103 a decent error from within the child, this should be verified as an
1104 executable directory by the parent. */
1107 child_setup (int in
, int out
, int err
, register char **new_argv
, int set_pgrp
, Lisp_Object current_dir
)
1114 #endif /* WINDOWSNT */
1116 int pid
= getpid ();
1118 /* Close Emacs's descriptors that this process should not have. */
1119 close_process_descs ();
1121 /* DOS_NT isn't in a vfork, so if we are in the middle of load-file,
1122 we will lose if we call close_load_descs here. */
1124 close_load_descs ();
1127 /* Note that use of alloca is always safe here. It's obvious for systems
1128 that do not have true vfork or that have true (stack) alloca.
1129 If using vfork and C_ALLOCA (when Emacs used to include
1130 src/alloca.c) it is safe because that changes the superior's
1131 static variables as if the superior had done alloca and will be
1132 cleaned up in the usual way. */
1134 register char *temp
;
1137 i
= SBYTES (current_dir
);
1139 /* MSDOS must have all environment variables malloc'ed, because
1140 low-level libc functions that launch subsidiary processes rely
1142 pwd_var
= (char *) xmalloc (i
+ 6);
1144 pwd_var
= (char *) alloca (i
+ 6);
1147 memcpy (pwd_var
, "PWD=", 4);
1148 memcpy (temp
, SDATA (current_dir
), i
);
1149 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
1153 /* We can't signal an Elisp error here; we're in a vfork. Since
1154 the callers check the current directory before forking, this
1155 should only return an error if the directory's permissions
1156 are changed between the check and this chdir, but we should
1158 if (chdir (temp
) < 0)
1161 /* Get past the drive letter, so that d:/ is left alone. */
1162 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1169 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1170 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1174 /* Set `env' to a vector of the strings in the environment. */
1176 register Lisp_Object tem
;
1177 register char **new_env
;
1179 register int new_length
;
1180 Lisp_Object display
= Qnil
;
1184 for (tem
= Vprocess_environment
;
1185 CONSP (tem
) && STRINGP (XCAR (tem
));
1188 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1189 && (SDATA (XCAR (tem
)) [7] == '\0'
1190 || SDATA (XCAR (tem
)) [7] == '='))
1191 /* DISPLAY is specified in process-environment. */
1196 /* If not provided yet, use the frame's DISPLAY. */
1199 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1200 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1201 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1202 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1203 Vinitial_environment
);
1211 /* new_length + 2 to include PWD and terminating 0. */
1212 env
= new_env
= (char **) alloca ((new_length
+ 2) * sizeof (char *));
1213 /* If we have a PWD envvar, pass one down,
1214 but with corrected value. */
1215 if (egetenv ("PWD"))
1216 *new_env
++ = pwd_var
;
1218 if (STRINGP (display
))
1220 int vlen
= strlen ("DISPLAY=") + strlen (SSDATA (display
)) + 1;
1221 char *vdata
= (char *) alloca (vlen
);
1222 strcpy (vdata
, "DISPLAY=");
1223 strcat (vdata
, SSDATA (display
));
1224 new_env
= add_env (env
, new_env
, vdata
);
1228 for (tem
= Vprocess_environment
;
1229 CONSP (tem
) && STRINGP (XCAR (tem
));
1231 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1235 /* Remove variable names without values. */
1239 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1249 prepare_standard_handles (in
, out
, err
, handles
);
1250 set_process_dir (SDATA (current_dir
));
1251 /* Spawn the child. (See ntproc.c:Spawnve). */
1252 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1253 reset_standard_handles (in
, out
, err
, handles
);
1255 /* An error occurred while trying to spawn the process. */
1256 report_file_error ("Spawning child process", Qnil
);
1259 #else /* not WINDOWSNT */
1260 /* Make sure that in, out, and err are not actually already in
1261 descriptors zero, one, or two; this could happen if Emacs is
1262 started with its standard in, out, or error closed, as might
1265 int oin
= in
, oout
= out
;
1267 /* We have to avoid relocating the same descriptor twice! */
1269 in
= relocate_fd (in
, 3);
1274 out
= relocate_fd (out
, 3);
1278 else if (err
== oout
)
1281 err
= relocate_fd (err
, 3);
1295 if (err
!= in
&& err
!= out
)
1299 #ifndef SETPGRP_RELEASES_CTTY
1300 setpgrp (); /* No arguments but equivalent in this case */
1304 #endif /* not USG */
1306 /* setpgrp_of_tty is incorrect here; it uses input_fd. */
1309 /* execvp does not accept an environment arg so the only way
1310 to pass this environment is to set environ. Our caller
1311 is responsible for restoring the ambient value of environ. */
1313 execvp (new_argv
[0], new_argv
);
1315 emacs_write (1, "Can't exec program: ", 20);
1316 emacs_write (1, new_argv
[0], strlen (new_argv
[0]));
1317 emacs_write (1, "\n", 1);
1321 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1324 /* An error occurred while trying to run the subprocess. */
1325 report_file_error ("Spawning child process", Qnil
);
1328 #endif /* not WINDOWSNT */
1332 /* Move the file descriptor FD so that its number is not less than MINFD.
1333 If the file descriptor is moved at all, the original is freed. */
1335 relocate_fd (int fd
, int minfd
)
1343 new = fcntl (fd
, F_DUPFD
, minfd
);
1347 /* Note that we hold the original FD open while we recurse,
1348 to guarantee we'll get a new FD if we need it. */
1349 new = relocate_fd (new, minfd
);
1353 const char *message_1
= "Error while setting up child: ";
1354 const char *errmessage
= strerror (errno
);
1355 const char *message_2
= "\n";
1356 emacs_write (2, message_1
, strlen (message_1
));
1357 emacs_write (2, errmessage
, strlen (errmessage
));
1358 emacs_write (2, message_2
, strlen (message_2
));
1365 #endif /* not WINDOWSNT */
1368 getenv_internal_1 (const char *var
, int varlen
, char **value
, int *valuelen
,
1371 for (; CONSP (env
); env
= XCDR (env
))
1373 Lisp_Object entry
= XCAR (env
);
1375 && SBYTES (entry
) >= varlen
1377 /* NT environment variables are case insensitive. */
1378 && ! strnicmp (SDATA (entry
), var
, varlen
)
1379 #else /* not WINDOWSNT */
1380 && ! memcmp (SDATA (entry
), var
, varlen
)
1381 #endif /* not WINDOWSNT */
1384 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1386 *value
= SSDATA (entry
) + (varlen
+ 1);
1387 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1390 else if (SBYTES (entry
) == varlen
)
1392 /* Lone variable names in Vprocess_environment mean that
1393 variable should be removed from the environment. */
1403 getenv_internal (const char *var
, int varlen
, char **value
, int *valuelen
,
1406 /* Try to find VAR in Vprocess_environment first. */
1407 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1408 Vprocess_environment
))
1409 return *value
? 1 : 0;
1411 /* For DISPLAY try to get the values from the frame or the initial env. */
1412 if (strcmp (var
, "DISPLAY") == 0)
1415 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1416 if (STRINGP (display
))
1418 *value
= SSDATA (display
);
1419 *valuelen
= SBYTES (display
);
1422 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1423 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1424 Vinitial_environment
))
1425 return *value
? 1 : 0;
1431 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1432 doc
: /* Get the value of environment variable VARIABLE.
1433 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1434 the environment. Otherwise, value is a string.
1436 This function searches `process-environment' for VARIABLE.
1438 If optional parameter ENV is a list, then search this list instead of
1439 `process-environment', and return t when encountering a negative entry
1440 \(an entry for a variable with no value). */)
1441 (Lisp_Object variable
, Lisp_Object env
)
1446 CHECK_STRING (variable
);
1449 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1450 &value
, &valuelen
, env
))
1451 return value
? make_string (value
, valuelen
) : Qt
;
1455 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1456 &value
, &valuelen
, env
))
1457 return make_string (value
, valuelen
);
1462 /* A version of getenv that consults the Lisp environment lists,
1463 easily callable from C. */
1465 egetenv (const char *var
)
1470 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1477 /* This is run before init_cmdargs. */
1480 init_callproc_1 (void)
1482 char *data_dir
= egetenv ("EMACSDATA");
1483 char *doc_dir
= egetenv ("EMACSDOC");
1486 = Ffile_name_as_directory (build_string (data_dir
? data_dir
1489 = Ffile_name_as_directory (build_string (doc_dir
? doc_dir
1492 /* Check the EMACSPATH environment variable, defaulting to the
1493 PATH_EXEC path from epaths.h. */
1494 Vexec_path
= decode_env_path ("EMACSPATH", PATH_EXEC
);
1495 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1496 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1499 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1502 init_callproc (void)
1504 char *data_dir
= egetenv ("EMACSDATA");
1507 Lisp_Object tempdir
;
1509 if (!NILP (Vinstallation_directory
))
1511 /* Add to the path the lib-src subdir of the installation dir. */
1513 tem
= Fexpand_file_name (build_string ("lib-src"),
1514 Vinstallation_directory
);
1516 /* MSDOS uses wrapped binaries, so don't do this. */
1517 if (NILP (Fmember (tem
, Vexec_path
)))
1519 Vexec_path
= decode_env_path ("EMACSPATH", PATH_EXEC
);
1520 Vexec_path
= Fcons (tem
, Vexec_path
);
1521 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1524 Vexec_directory
= Ffile_name_as_directory (tem
);
1525 #endif /* not DOS_NT */
1527 /* Maybe use ../etc as well as ../lib-src. */
1530 tem
= Fexpand_file_name (build_string ("etc"),
1531 Vinstallation_directory
);
1532 Vdoc_directory
= Ffile_name_as_directory (tem
);
1536 /* Look for the files that should be in etc. We don't use
1537 Vinstallation_directory, because these files are never installed
1538 near the executable, and they are never in the build
1539 directory when that's different from the source directory.
1541 Instead, if these files are not in the nominal place, we try the
1542 source directory. */
1545 Lisp_Object tem
, tem1
, srcdir
;
1547 srcdir
= Fexpand_file_name (build_string ("../src/"),
1548 build_string (PATH_DUMPLOADSEARCH
));
1549 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1550 tem1
= Ffile_exists_p (tem
);
1551 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1554 newdir
= Fexpand_file_name (build_string ("../etc/"),
1555 build_string (PATH_DUMPLOADSEARCH
));
1556 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1557 tem1
= Ffile_exists_p (tem
);
1559 Vdata_directory
= newdir
;
1567 tempdir
= Fdirectory_file_name (Vexec_directory
);
1568 if (access (SSDATA (tempdir
), 0) < 0)
1569 dir_warning ("Warning: arch-dependent data dir (%s) does not exist.\n",
1573 tempdir
= Fdirectory_file_name (Vdata_directory
);
1574 if (access (SSDATA (tempdir
), 0) < 0)
1575 dir_warning ("Warning: arch-independent data dir (%s) does not exist.\n",
1578 sh
= (char *) getenv ("SHELL");
1579 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1582 Vshared_game_score_directory
= Qnil
;
1584 Vshared_game_score_directory
= build_string (PATH_GAME
);
1585 if (NILP (Ffile_directory_p (Vshared_game_score_directory
)))
1586 Vshared_game_score_directory
= Qnil
;
1591 set_initial_environment (void)
1593 register char **envp
;
1595 Vprocess_environment
= Qnil
;
1600 for (envp
= environ
; *envp
; envp
++)
1601 Vprocess_environment
= Fcons (build_string (*envp
),
1602 Vprocess_environment
);
1603 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1604 to use `delete' and friends on process-environment. */
1605 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1610 syms_of_callproc (void)
1613 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1614 #elif defined (WINDOWSNT)
1615 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1617 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1619 staticpro (&Vtemp_file_name_pattern
);
1621 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1622 doc
: /* *File name to load inferior shells from.
1623 Initialized from the SHELL environment variable, or to a system-dependent
1624 default if SHELL is not set. */);
1626 DEFVAR_LISP ("exec-path", Vexec_path
,
1627 doc
: /* *List of directories to search programs to run in subprocesses.
1628 Each element is a string (directory name) or nil (try default directory). */);
1630 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1631 doc
: /* *List of suffixes to try to find executable file names.
1632 Each element is a string. */);
1633 Vexec_suffixes
= Qnil
;
1635 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1636 doc
: /* Directory for executables for Emacs to invoke.
1637 More generally, this includes any architecture-dependent files
1638 that are built and installed from the Emacs distribution. */);
1640 DEFVAR_LISP ("data-directory", Vdata_directory
,
1641 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1642 These are files intended for Emacs to use while it runs. */);
1644 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1645 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1646 This is usually the same as `data-directory'. */);
1648 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1649 doc
: /* For internal use by the build procedure only.
1650 This is the name of the directory in which the build procedure installed
1651 Emacs's info files; the default value for `Info-default-directory-list'
1653 Vconfigure_info_directory
= build_string (PATH_INFO
);
1655 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1656 doc
: /* Directory of score files for games which come with GNU Emacs.
1657 If this variable is nil, then Emacs is unable to use a shared directory. */);
1659 Vshared_game_score_directory
= Qnil
;
1661 Vshared_game_score_directory
= build_string (PATH_GAME
);
1664 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1665 doc
: /* List of environment variables inherited from the parent process.
1666 Each element should be a string of the form ENVVARNAME=VALUE.
1667 The elements must normally be decoded (using `locale-coding-system') for use. */);
1668 Vinitial_environment
= Qnil
;
1670 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1671 doc
: /* List of overridden environment variables for subprocesses to inherit.
1672 Each element should be a string of the form ENVVARNAME=VALUE.
1674 Entries in this list take precedence to those in the frame-local
1675 environments. Therefore, let-binding `process-environment' is an easy
1676 way to temporarily change the value of an environment variable,
1677 irrespective of where it comes from. To use `process-environment' to
1678 remove an environment variable, include only its name in the list,
1681 This variable is set to nil when Emacs starts.
1683 If multiple entries define the same variable, the first one always
1686 Non-ASCII characters are encoded according to the initial value of
1687 `locale-coding-system', i.e. the elements must normally be decoded for
1690 See `setenv' and `getenv'. */);
1691 Vprocess_environment
= Qnil
;
1693 defsubr (&Scall_process
);
1694 defsubr (&Sgetenv_internal
);
1695 defsubr (&Scall_process_region
);