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>
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>
48 #include "character.h"
51 #include "composite.h"
54 #include "syssignal.h"
56 #include "blockinput.h"
58 #include "termhooks.h"
65 extern char **environ
;
71 #define setpgrp setpgid
75 /* Pattern used by call-process-region to make temp files. */
76 static Lisp_Object Vtemp_file_name_pattern
;
78 /* True if we are about to fork off a synchronous process or if we
79 are waiting for it. */
80 int synch_process_alive
;
82 /* Nonzero => this is a string explaining death of synchronous subprocess. */
83 const char *synch_process_death
;
85 /* Nonzero => this is the signal number that terminated the subprocess. */
86 int synch_process_termsig
;
88 /* If synch_process_death is zero,
89 this is exit code of synchronous subprocess. */
90 int synch_process_retcode
;
93 /* Clean up when exiting Fcall_process.
94 On MSDOS, delete the temporary file on any kind of termination.
95 On Unix, kill the process and any children on termination by signal. */
97 /* Nonzero if this is termination due to exit. */
98 static int call_process_exited
;
100 static Lisp_Object
Fgetenv_internal (Lisp_Object
, Lisp_Object
);
103 call_process_kill (Lisp_Object fdpid
)
105 emacs_close (XFASTINT (Fcar (fdpid
)));
106 EMACS_KILLPG (XFASTINT (Fcdr (fdpid
)), SIGKILL
);
107 synch_process_alive
= 0;
112 call_process_cleanup (Lisp_Object arg
)
114 Lisp_Object fdpid
= Fcdr (arg
);
122 Fset_buffer (Fcar (arg
));
125 /* for MSDOS fdpid is really (fd . tempfile) */
126 fd
= XFASTINT (Fcar (fdpid
));
128 /* FD is -1 and FILE is "" when we didn't actually create a
129 temporary file in call-process. */
132 if (!(strcmp (SDATA (file
), NULL_DEVICE
) == 0 || SREF (file
, 0) == '\0'))
133 unlink (SDATA (file
));
134 #else /* not MSDOS */
135 pid
= XFASTINT (Fcdr (fdpid
));
137 if (call_process_exited
)
139 emacs_close (XFASTINT (Fcar (fdpid
)));
143 if (EMACS_KILLPG (pid
, SIGINT
) == 0)
145 int count
= SPECPDL_INDEX ();
146 record_unwind_protect (call_process_kill
, fdpid
);
147 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
150 wait_for_termination (pid
);
152 specpdl_ptr
= specpdl
+ count
; /* Discard the unwind protect. */
153 message1 ("Waiting for process to die...done");
155 synch_process_alive
= 0;
156 emacs_close (XFASTINT (Fcar (fdpid
)));
157 #endif /* not MSDOS */
161 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
162 doc
: /* Call PROGRAM synchronously in separate process.
163 The remaining arguments are optional.
164 The program's input comes from file INFILE (nil means `/dev/null').
165 Insert output in BUFFER before point; t means current buffer; nil for BUFFER
166 means discard it; 0 means discard and don't wait; and `(:file FILE)', where
167 FILE is a file name string, means that it should be written to that file.
168 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
169 REAL-BUFFER says what to do with standard output, as above,
170 while STDERR-FILE says what to do with standard error in the child.
171 STDERR-FILE may be nil (discard standard error output),
172 t (mix it with ordinary output), or a file name string.
174 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
175 Remaining arguments are strings passed as command arguments to PROGRAM.
177 If executable PROGRAM can't be found as an executable, `call-process'
178 signals a Lisp error. `call-process' reports errors in execution of
179 the program only through its return and output.
181 If BUFFER is 0, `call-process' returns immediately with value nil.
182 Otherwise it waits for PROGRAM to terminate
183 and returns a numeric exit status or a signal description string.
184 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
186 usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS) */)
187 (ptrdiff_t nargs
, Lisp_Object
*args
)
189 Lisp_Object infile
, buffer
, current_dir
, path
;
190 volatile int display_p_volatile
;
194 #define CALLPROC_BUFFER_SIZE_MIN (16 * 1024)
195 #define CALLPROC_BUFFER_SIZE_MAX (4 * CALLPROC_BUFFER_SIZE_MIN)
196 char buf
[CALLPROC_BUFFER_SIZE_MAX
];
197 int bufsize
= CALLPROC_BUFFER_SIZE_MIN
;
198 int count
= SPECPDL_INDEX ();
199 volatile USE_SAFE_ALLOCA
;
201 register const unsigned char **new_argv
;
202 /* File to use for stderr in the child.
203 t means use same as standard output. */
204 Lisp_Object error_file
;
205 Lisp_Object output_file
= Qnil
;
206 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
207 char *outf
, *tempfile
= NULL
;
211 struct coding_system process_coding
; /* coding-system of process output */
212 struct coding_system argument_coding
; /* coding-system of arguments */
213 /* Set to the return value of Ffind_operation_coding_system. */
214 Lisp_Object coding_systems
;
215 int output_to_buffer
= 1;
217 /* Qt denotes that Ffind_operation_coding_system is not yet called. */
220 CHECK_STRING (args
[0]);
225 /* Without asynchronous processes we cannot have BUFFER == 0. */
227 && (INTEGERP (CONSP (args
[2]) ? XCAR (args
[2]) : args
[2])))
228 error ("Operating system cannot handle asynchronous subprocesses");
229 #endif /* subprocesses */
231 /* Decide the coding-system for giving arguments. */
233 Lisp_Object val
, *args2
;
236 /* If arguments are supplied, we may have to encode them. */
240 Lisp_Object coding_attrs
;
242 for (i
= 4; i
< nargs
; i
++)
243 CHECK_STRING (args
[i
]);
245 for (i
= 4; i
< nargs
; i
++)
246 if (STRING_MULTIBYTE (args
[i
]))
249 if (!NILP (Vcoding_system_for_write
))
250 val
= Vcoding_system_for_write
;
251 else if (! must_encode
)
255 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
256 args2
[0] = Qcall_process
;
257 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
258 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
259 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
261 val
= complement_process_encoding_system (val
);
262 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
263 coding_attrs
= CODING_ID_ATTRS (argument_coding
.id
);
264 if (NILP (CODING_ATTR_ASCII_COMPAT (coding_attrs
)))
266 /* We should not use an ASCII incompatible coding system. */
267 val
= raw_text_coding_system (val
);
268 setup_coding_system (val
, &argument_coding
);
273 if (nargs
>= 2 && ! NILP (args
[1]))
275 infile
= Fexpand_file_name (args
[1], BVAR (current_buffer
, directory
));
276 CHECK_STRING (infile
);
279 infile
= build_string (NULL_DEVICE
);
285 /* If BUFFER is a list, its meaning is (BUFFER-FOR-STDOUT
286 FILE-FOR-STDERR), unless the first element is :file, in which case see
287 the next paragraph. */
289 && (! SYMBOLP (XCAR (buffer
))
290 || strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file")))
292 if (CONSP (XCDR (buffer
)))
294 Lisp_Object stderr_file
;
295 stderr_file
= XCAR (XCDR (buffer
));
297 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
298 error_file
= stderr_file
;
300 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
303 buffer
= XCAR (buffer
);
306 /* If the buffer is (still) a list, it might be a (:file "file") spec. */
308 && SYMBOLP (XCAR (buffer
))
309 && ! strcmp (SSDATA (SYMBOL_NAME (XCAR (buffer
))), ":file"))
311 output_file
= Fexpand_file_name (XCAR (XCDR (buffer
)),
312 BVAR (current_buffer
, directory
));
313 CHECK_STRING (output_file
);
317 if (!(EQ (buffer
, Qnil
)
319 || INTEGERP (buffer
)))
321 Lisp_Object spec_buffer
;
322 spec_buffer
= buffer
;
323 buffer
= Fget_buffer_create (buffer
);
324 /* Mention the buffer name for a better error message. */
326 CHECK_BUFFER (spec_buffer
);
327 CHECK_BUFFER (buffer
);
333 /* Make sure that the child will be able to chdir to the current
334 buffer's current directory, or its unhandled equivalent. We
335 can't just have the child check for an error when it does the
336 chdir, since it's in a vfork.
338 We have to GCPRO around this because Fexpand_file_name,
339 Funhandled_file_name_directory, and Ffile_accessible_directory_p
340 might call a file name handling function. The argument list is
341 protected by the caller, so all we really have to worry about is
344 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
346 current_dir
= BVAR (current_buffer
, directory
);
348 GCPRO5 (infile
, buffer
, current_dir
, error_file
, output_file
);
350 current_dir
= Funhandled_file_name_directory (current_dir
);
351 if (NILP (current_dir
))
352 /* If the file name handler says that current_dir is unreachable, use
353 a sensible default. */
354 current_dir
= build_string ("~/");
355 current_dir
= expand_and_dir_to_file (current_dir
, Qnil
);
356 current_dir
= Ffile_name_as_directory (current_dir
);
358 if (NILP (Ffile_accessible_directory_p (current_dir
)))
359 report_file_error ("Setting current directory",
360 Fcons (BVAR (current_buffer
, directory
), Qnil
));
362 if (STRING_MULTIBYTE (infile
))
363 infile
= ENCODE_FILE (infile
);
364 if (STRING_MULTIBYTE (current_dir
))
365 current_dir
= ENCODE_FILE (current_dir
);
366 if (STRINGP (error_file
) && STRING_MULTIBYTE (error_file
))
367 error_file
= ENCODE_FILE (error_file
);
368 if (STRINGP (output_file
) && STRING_MULTIBYTE (output_file
))
369 output_file
= ENCODE_FILE (output_file
);
373 display_p_volatile
= INTERACTIVE
&& nargs
>= 4 && !NILP (args
[3]);
375 filefd
= emacs_open (SSDATA (infile
), O_RDONLY
, 0);
378 infile
= DECODE_FILE (infile
);
379 report_file_error ("Opening process input file", Fcons (infile
, Qnil
));
382 if (STRINGP (output_file
))
385 fd_output
= emacs_open (SSDATA (output_file
),
386 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
388 #else /* not DOS_NT */
389 fd_output
= creat (SSDATA (output_file
), 0666);
390 #endif /* not DOS_NT */
393 output_file
= DECODE_FILE (output_file
);
394 report_file_error ("Opening process output file",
395 Fcons (output_file
, Qnil
));
397 if (STRINGP (error_file
) || NILP (error_file
))
398 output_to_buffer
= 0;
401 /* Search for program; barf if not found. */
403 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
;
405 GCPRO4 (infile
, buffer
, current_dir
, error_file
);
406 openp (Vexec_path
, args
[0], Vexec_suffixes
, &path
, make_number (X_OK
));
411 emacs_close (filefd
);
412 report_file_error ("Searching for program", Fcons (args
[0], Qnil
));
415 /* If program file name starts with /: for quoting a magic name,
417 if (SBYTES (path
) > 2 && SREF (path
, 0) == '/'
418 && SREF (path
, 1) == ':')
419 path
= Fsubstring (path
, make_number (2), Qnil
);
421 SAFE_ALLOCA (new_argv
, const unsigned char **,
422 (nargs
> 4 ? nargs
- 2 : 2) * sizeof *new_argv
);
426 struct gcpro gcpro1
, gcpro2
, gcpro3
, gcpro4
, gcpro5
;
428 GCPRO5 (infile
, buffer
, current_dir
, path
, error_file
);
429 argument_coding
.dst_multibyte
= 0;
430 for (i
= 4; i
< nargs
; i
++)
432 argument_coding
.src_multibyte
= STRING_MULTIBYTE (args
[i
]);
433 if (CODING_REQUIRE_ENCODING (&argument_coding
))
434 /* We must encode this argument. */
435 args
[i
] = encode_coding_string (&argument_coding
, args
[i
], 1);
438 for (i
= 4; i
< nargs
; i
++)
439 new_argv
[i
- 3] = SDATA (args
[i
]);
444 new_argv
[0] = SDATA (path
);
446 #ifdef MSDOS /* MW, July 1993 */
448 /* If we're redirecting STDOUT to a file, that file is already open
452 if ((outf
= egetenv ("TMPDIR")))
453 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
456 tempfile
= alloca (20);
459 dostounix_filename (tempfile
);
460 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
461 strcat (tempfile
, "/");
462 strcat (tempfile
, "detmp.XXX");
464 outfilefd
= creat (tempfile
, S_IREAD
| S_IWRITE
);
466 emacs_close (filefd
);
467 report_file_error ("Opening process output file",
468 Fcons (build_string (tempfile
), Qnil
));
472 outfilefd
= fd_output
;
477 if (INTEGERP (buffer
))
478 fd
[1] = emacs_open (NULL_DEVICE
, O_WRONLY
, 0), fd
[0] = -1;
485 emacs_close (filefd
);
486 report_file_error ("Creating process pipe", Qnil
);
492 /* child_setup must clobber environ in systems with true vfork.
493 Protect it from permanent change. */
494 register char **save_environ
= environ
;
495 register int fd1
= fd
[1];
497 #ifdef HAVE_WORKING_VFORK
500 struct sigaction sigpipe_action
;
505 #if 0 /* Some systems don't have sigblock. */
506 mask
= sigblock (sigmask (SIGCHLD
));
509 /* Record that we're about to create a synchronous process. */
510 synch_process_alive
= 1;
512 /* These vars record information from process termination.
513 Clear them now before process can possibly terminate,
514 to avoid timing error if process terminates soon. */
515 synch_process_death
= 0;
516 synch_process_retcode
= 0;
517 synch_process_termsig
= 0;
519 if (NILP (error_file
))
520 fd_error
= emacs_open (NULL_DEVICE
, O_WRONLY
, 0);
521 else if (STRINGP (error_file
))
524 fd_error
= emacs_open (SSDATA (error_file
),
525 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
527 #else /* not DOS_NT */
528 fd_error
= creat (SSDATA (error_file
), 0666);
529 #endif /* not DOS_NT */
534 emacs_close (filefd
);
542 if (NILP (error_file
))
543 error_file
= build_string (NULL_DEVICE
);
544 else if (STRINGP (error_file
))
545 error_file
= DECODE_FILE (error_file
);
546 report_file_error ("Cannot redirect stderr", Fcons (error_file
, Qnil
));
549 #ifdef MSDOS /* MW, July 1993 */
550 /* Note that on MSDOS `child_setup' actually returns the child process
551 exit status, not its PID, so we assign it to `synch_process_retcode'
553 pid
= child_setup (filefd
, outfilefd
, fd_error
, (char **) new_argv
,
556 /* Record that the synchronous process exited and note its
557 termination status. */
558 synch_process_alive
= 0;
559 synch_process_retcode
= pid
;
560 if (synch_process_retcode
< 0) /* means it couldn't be exec'ed */
562 synchronize_system_messages_locale ();
563 synch_process_death
= strerror (errno
);
566 emacs_close (outfilefd
);
567 if (fd_error
!= outfilefd
)
568 emacs_close (fd_error
);
569 fd1
= -1; /* No harm in closing that one! */
572 /* Since CRLF is converted to LF within `decode_coding', we
573 can always open a file with binary mode. */
574 fd
[0] = emacs_open (tempfile
, O_RDONLY
| O_BINARY
, 0);
578 emacs_close (filefd
);
579 report_file_error ("Cannot re-open temporary file",
580 Fcons (build_string (tempfile
), Qnil
));
584 fd
[0] = -1; /* We are not going to read from tempfile. */
585 #else /* not MSDOS */
587 pid
= child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
589 #else /* not WINDOWSNT */
591 #ifdef HAVE_WORKING_VFORK
592 /* On many hosts (e.g. Solaris 2.4), if a vforked child calls `signal',
593 this sets the parent's signal handlers as well as the child's.
594 So delay all interrupts whose handlers the child might munge,
595 and record the current handlers so they can be restored later. */
596 sigemptyset (&blocked
);
597 sigaddset (&blocked
, SIGPIPE
);
598 sigaction (SIGPIPE
, 0, &sigpipe_action
);
599 pthread_sigmask (SIG_BLOCK
, &blocked
, &procmask
);
604 /* vfork, and prevent local vars from being clobbered by the vfork. */
606 Lisp_Object
volatile buffer_volatile
= buffer
;
607 Lisp_Object
volatile coding_systems_volatile
= coding_systems
;
608 Lisp_Object
volatile current_dir_volatile
= current_dir
;
609 int volatile fd1_volatile
= fd1
;
610 int volatile fd_error_volatile
= fd_error
;
611 int volatile fd_output_volatile
= fd_output
;
612 int volatile output_to_buffer_volatile
= output_to_buffer
;
613 unsigned char const **volatile new_argv_volatile
= new_argv
;
617 buffer
= buffer_volatile
;
618 coding_systems
= coding_systems_volatile
;
619 current_dir
= current_dir_volatile
;
621 fd_error
= fd_error_volatile
;
622 fd_output
= fd_output_volatile
;
623 output_to_buffer
= output_to_buffer_volatile
;
624 new_argv
= new_argv_volatile
;
640 /* GConf causes us to ignore SIGPIPE, make sure it is restored
642 //signal (SIGPIPE, SIG_DFL);
643 #ifdef HAVE_WORKING_VFORK
644 pthread_sigmask (SIG_SETMASK
, &procmask
, 0);
647 child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
653 #ifdef HAVE_WORKING_VFORK
654 /* Restore the signal state. */
655 sigaction (SIGPIPE
, &sigpipe_action
, 0);
656 pthread_sigmask (SIG_SETMASK
, &procmask
, 0);
659 #endif /* not WINDOWSNT */
661 /* The MSDOS case did this already. */
663 emacs_close (fd_error
);
664 #endif /* not MSDOS */
666 environ
= save_environ
;
668 /* Close most of our fd's, but not fd[0]
669 since we will use that to read input from. */
670 emacs_close (filefd
);
672 emacs_close (fd_output
);
673 if (fd1
>= 0 && fd1
!= fd_error
)
681 report_file_error ("Doing vfork", Qnil
);
684 if (INTEGERP (buffer
))
691 /* Enable sending signal if user quits below. */
692 call_process_exited
= 0;
695 /* MSDOS needs different cleanup information. */
696 record_unwind_protect (call_process_cleanup
,
697 Fcons (Fcurrent_buffer (),
698 Fcons (make_number (fd
[0]),
699 build_string (tempfile
? tempfile
: ""))));
701 record_unwind_protect (call_process_cleanup
,
702 Fcons (Fcurrent_buffer (),
703 Fcons (make_number (fd
[0]), make_number (pid
))));
704 #endif /* not MSDOS */
707 if (BUFFERP (buffer
))
708 Fset_buffer (buffer
);
712 /* If BUFFER is nil, we must read process output once and then
713 discard it, so setup coding system but with nil. */
714 setup_coding_system (Qnil
, &process_coding
);
718 Lisp_Object val
, *args2
;
721 if (!NILP (Vcoding_system_for_read
))
722 val
= Vcoding_system_for_read
;
725 if (EQ (coding_systems
, Qt
))
729 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
730 args2
[0] = Qcall_process
;
731 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
733 = Ffind_operation_coding_system (nargs
+ 1, args2
);
735 if (CONSP (coding_systems
))
736 val
= XCAR (coding_systems
);
737 else if (CONSP (Vdefault_process_coding_system
))
738 val
= XCAR (Vdefault_process_coding_system
);
742 Fcheck_coding_system (val
);
743 /* In unibyte mode, character code conversion should not take
744 place but EOL conversion should. So, setup raw-text or one
745 of the subsidiary according to the information just setup. */
746 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
748 val
= raw_text_coding_system (val
);
749 setup_coding_system (val
, &process_coding
);
751 process_coding
.src_multibyte
= 0;
756 if (output_to_buffer
)
758 register EMACS_INT nread
;
760 EMACS_INT total_read
= 0;
762 int display_p
= display_p_volatile
;
763 int display_on_the_fly
= display_p
;
764 struct coding_system saved_coding
;
766 saved_coding
= process_coding
;
769 /* Repeatedly read until we've filled as much as possible
770 of the buffer size we have. But don't read
771 less than 1024--save that for the next bufferful. */
773 while (nread
< bufsize
- 1024)
775 int this_read
= emacs_read (fd
[0], buf
+ nread
,
783 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
788 total_read
+= this_read
;
790 if (display_on_the_fly
)
794 /* Now NREAD is the total amount of data in the buffer. */
799 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
))
800 && ! CODING_MAY_REQUIRE_DECODING (&process_coding
))
801 insert_1_both (buf
, nread
, nread
, 0, 1, 0);
803 { /* We have to decode the input. */
805 int count1
= SPECPDL_INDEX ();
807 XSETBUFFER (curbuf
, current_buffer
);
808 /* We cannot allow after-change-functions be run
809 during decoding, because that might modify the
810 buffer, while we rely on process_coding.produced to
811 faithfully reflect inserted text until we
812 TEMP_SET_PT_BOTH below. */
813 specbind (Qinhibit_modification_hooks
, Qt
);
814 decode_coding_c_string (&process_coding
,
815 (unsigned char *) buf
, nread
, curbuf
);
816 unbind_to (count1
, Qnil
);
817 if (display_on_the_fly
818 && CODING_REQUIRE_DETECTION (&saved_coding
)
819 && ! CODING_REQUIRE_DETECTION (&process_coding
))
821 /* We have detected some coding system. But,
822 there's a possibility that the detection was
823 done by insufficient data. So, we give up
824 displaying on the fly. */
825 if (process_coding
.produced
> 0)
826 del_range_2 (process_coding
.dst_pos
,
827 process_coding
.dst_pos_byte
,
828 process_coding
.dst_pos
829 + process_coding
.produced_char
,
830 process_coding
.dst_pos_byte
831 + process_coding
.produced
, 0);
832 display_on_the_fly
= 0;
833 process_coding
= saved_coding
;
835 /* This is to make the above condition always
836 fails in the future. */
837 saved_coding
.common_flags
838 &= ~CODING_REQUIRE_DETECTION_MASK
;
842 TEMP_SET_PT_BOTH (PT
+ process_coding
.produced_char
,
843 PT_BYTE
+ process_coding
.produced
);
844 carryover
= process_coding
.carryover_bytes
;
846 memcpy (buf
, process_coding
.carryover
,
847 process_coding
.carryover_bytes
);
851 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
854 /* Make the buffer bigger as we continue to read more data,
855 but not past CALLPROC_BUFFER_SIZE_MAX. */
856 if (bufsize
< CALLPROC_BUFFER_SIZE_MAX
&& total_read
> 32 * bufsize
)
857 if ((bufsize
*= 2) > CALLPROC_BUFFER_SIZE_MAX
)
858 bufsize
= CALLPROC_BUFFER_SIZE_MAX
;
863 prepare_menu_bars ();
865 redisplay_preserve_echo_area (1);
866 /* This variable might have been set to 0 for code
867 detection. In that case, we set it back to 1 because
868 we should have already detected a coding system. */
869 display_on_the_fly
= 1;
876 Vlast_coding_system_used
= CODING_ID_NAME (process_coding
.id
);
877 /* If the caller required, let the buffer inherit the
878 coding-system used to decode the process output. */
879 if (inherit_process_coding_system
)
880 call1 (intern ("after-insert-file-set-buffer-file-coding-system"),
881 make_number (total_read
));
885 /* Wait for it to terminate, unless it already has. */
886 if (output_to_buffer
)
887 wait_for_termination (pid
);
889 interruptible_wait_for_termination (pid
);
894 /* Don't kill any children that the subprocess may have left behind
896 call_process_exited
= 1;
899 unbind_to (count
, Qnil
);
901 if (synch_process_termsig
)
905 synchronize_system_messages_locale ();
906 signame
= strsignal (synch_process_termsig
);
911 synch_process_death
= signame
;
914 if (synch_process_death
)
915 return code_convert_string_norecord (build_string (synch_process_death
),
916 Vlocale_coding_system
, 0);
917 return make_number (synch_process_retcode
);
921 delete_temp_file (Lisp_Object name
)
923 /* Suppress jka-compr handling, etc. */
924 int count
= SPECPDL_INDEX ();
925 specbind (intern ("file-name-handler-alist"), Qnil
);
926 internal_delete_file (name
);
927 unbind_to (count
, Qnil
);
931 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
933 doc
: /* Send text from START to END to a synchronous process running PROGRAM.
934 The remaining arguments are optional.
935 Delete the text if fourth arg DELETE is non-nil.
937 Insert output in BUFFER before point; t means current buffer; nil for
938 BUFFER means discard it; 0 means discard and don't wait; and `(:file
939 FILE)', where FILE is a file name string, means that it should be
940 written to that file.
941 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
942 REAL-BUFFER says what to do with standard output, as above,
943 while STDERR-FILE says what to do with standard error in the child.
944 STDERR-FILE may be nil (discard standard error output),
945 t (mix it with ordinary output), or a file name string.
947 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.
948 Remaining args are passed to PROGRAM at startup as command args.
950 If BUFFER is 0, `call-process-region' returns immediately with value nil.
951 Otherwise it waits for PROGRAM to terminate
952 and returns a numeric exit status or a signal description string.
953 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.
955 usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &rest ARGS) */)
956 (ptrdiff_t nargs
, Lisp_Object
*args
)
959 Lisp_Object filename_string
;
960 register Lisp_Object start
, end
;
961 int count
= SPECPDL_INDEX ();
962 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
963 Lisp_Object coding_systems
;
964 Lisp_Object val
, *args2
;
967 Lisp_Object tmpdir
, pattern
;
969 if (STRINGP (Vtemporary_file_directory
))
970 tmpdir
= Vtemporary_file_directory
;
974 if (getenv ("TMPDIR"))
975 tmpdir
= build_string (getenv ("TMPDIR"));
977 tmpdir
= build_string ("/tmp/");
980 if ((outf
= egetenv ("TMPDIR"))
981 || (outf
= egetenv ("TMP"))
982 || (outf
= egetenv ("TEMP")))
983 tmpdir
= build_string (outf
);
985 tmpdir
= Ffile_name_as_directory (build_string ("c:/temp"));
991 pattern
= Fexpand_file_name (Vtemp_file_name_pattern
, tmpdir
);
992 SAFE_ALLOCA (tempfile
, char *, SBYTES (pattern
) + 1);
993 memcpy (tempfile
, SDATA (pattern
), SBYTES (pattern
) + 1);
1001 fd
= mkstemp (tempfile
);
1004 report_file_error ("Failed to open temporary file",
1005 Fcons (Vtemp_file_name_pattern
, Qnil
));
1013 filename_string
= build_string (tempfile
);
1014 GCPRO1 (filename_string
);
1020 /* Decide coding-system of the contents of the temporary file. */
1021 if (!NILP (Vcoding_system_for_write
))
1022 val
= Vcoding_system_for_write
;
1023 else if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
1028 SAFE_NALLOCA (args2
, 1, nargs
+ 1);
1029 args2
[0] = Qcall_process_region
;
1030 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
1031 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
1032 val
= CONSP (coding_systems
) ? XCDR (coding_systems
) : Qnil
;
1035 val
= complement_process_encoding_system (val
);
1038 int count1
= SPECPDL_INDEX ();
1040 specbind (intern ("coding-system-for-write"), val
);
1041 /* POSIX lets mk[s]temp use "."; don't invoke jka-compr if we
1042 happen to get a ".Z" suffix. */
1043 specbind (intern ("file-name-handler-alist"), Qnil
);
1044 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
1046 unbind_to (count1
, Qnil
);
1049 /* Note that Fcall_process takes care of binding
1050 coding-system-for-read. */
1052 record_unwind_protect (delete_temp_file
, filename_string
);
1054 if (nargs
> 3 && !NILP (args
[3]))
1055 Fdelete_region (start
, end
);
1067 args
[1] = filename_string
;
1069 RETURN_UNGCPRO (unbind_to (count
, Fcall_process (nargs
, args
)));
1073 static int relocate_fd (int fd
, int minfd
);
1077 add_env (char **env
, char **new_env
, char *string
)
1084 /* See if this string duplicates any string already in the env.
1085 If so, don't put it in.
1086 When an env var has multiple definitions,
1087 we keep the definition that comes first in process-environment. */
1088 for (ep
= env
; ok
&& ep
!= new_env
; ep
++)
1090 char *p
= *ep
, *q
= string
;
1096 /* The string is a lone variable name; keep it for now, we
1097 will remove it later. It is a placeholder for a
1098 variable that is not to be included in the environment. */
1106 *new_env
++ = string
;
1110 /* This is the last thing run in a newly forked inferior
1111 either synchronous or asynchronous.
1112 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
1113 Initialize inferior's priority, pgrp, connected dir and environment.
1114 then exec another program based on new_argv.
1116 This function may change environ for the superior process.
1117 Therefore, the superior process must save and restore the value
1118 of environ around the vfork and the call to this function.
1120 SET_PGRP is nonzero if we should put the subprocess into a separate
1123 CURRENT_DIR is an elisp string giving the path of the current
1124 directory the subprocess should have. Since we can't really signal
1125 a decent error from within the child, this should be verified as an
1126 executable directory by the parent. */
1129 child_setup (int in
, int out
, int err
, register char **new_argv
, int set_pgrp
, Lisp_Object current_dir
)
1136 #endif /* WINDOWSNT */
1138 int pid
= getpid ();
1140 /* Close Emacs's descriptors that this process should not have. */
1141 close_process_descs ();
1143 /* DOS_NT isn't in a vfork, so if we are in the middle of load-file,
1144 we will lose if we call close_load_descs here. */
1146 close_load_descs ();
1149 /* Note that use of alloca is always safe here. It's obvious for systems
1150 that do not have true vfork or that have true (stack) alloca.
1151 If using vfork and C_ALLOCA (when Emacs used to include
1152 src/alloca.c) it is safe because that changes the superior's
1153 static variables as if the superior had done alloca and will be
1154 cleaned up in the usual way. */
1156 register char *temp
;
1157 size_t i
; /* size_t, because ptrdiff_t might overflow here! */
1159 i
= SBYTES (current_dir
);
1161 /* MSDOS must have all environment variables malloc'ed, because
1162 low-level libc functions that launch subsidiary processes rely
1164 pwd_var
= (char *) xmalloc (i
+ 6);
1166 pwd_var
= (char *) alloca (i
+ 6);
1169 memcpy (pwd_var
, "PWD=", 4);
1170 memcpy (temp
, SDATA (current_dir
), i
);
1171 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
1175 /* We can't signal an Elisp error here; we're in a vfork. Since
1176 the callers check the current directory before forking, this
1177 should only return an error if the directory's permissions
1178 are changed between the check and this chdir, but we should
1180 if (chdir (temp
) < 0)
1183 /* Get past the drive letter, so that d:/ is left alone. */
1184 if (i
> 2 && IS_DEVICE_SEP (temp
[1]) && IS_DIRECTORY_SEP (temp
[2]))
1191 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
1192 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1196 /* Set `env' to a vector of the strings in the environment. */
1198 register Lisp_Object tem
;
1199 register char **new_env
;
1201 register int new_length
;
1202 Lisp_Object display
= Qnil
;
1206 for (tem
= Vprocess_environment
;
1207 CONSP (tem
) && STRINGP (XCAR (tem
));
1210 if (strncmp (SSDATA (XCAR (tem
)), "DISPLAY", 7) == 0
1211 && (SDATA (XCAR (tem
)) [7] == '\0'
1212 || SDATA (XCAR (tem
)) [7] == '='))
1213 /* DISPLAY is specified in process-environment. */
1218 /* If not provided yet, use the frame's DISPLAY. */
1221 Lisp_Object tmp
= Fframe_parameter (selected_frame
, Qdisplay
);
1222 if (!STRINGP (tmp
) && CONSP (Vinitial_environment
))
1223 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1224 tmp
= Fgetenv_internal (build_string ("DISPLAY"),
1225 Vinitial_environment
);
1233 /* new_length + 2 to include PWD and terminating 0. */
1234 env
= new_env
= (char **) alloca ((new_length
+ 2) * sizeof (char *));
1235 /* If we have a PWD envvar, pass one down,
1236 but with corrected value. */
1237 if (egetenv ("PWD"))
1238 *new_env
++ = pwd_var
;
1240 if (STRINGP (display
))
1242 char *vdata
= (char *) alloca (sizeof "DISPLAY=" + SBYTES (display
));
1243 strcpy (vdata
, "DISPLAY=");
1244 strcat (vdata
, SSDATA (display
));
1245 new_env
= add_env (env
, new_env
, vdata
);
1249 for (tem
= Vprocess_environment
;
1250 CONSP (tem
) && STRINGP (XCAR (tem
));
1252 new_env
= add_env (env
, new_env
, SSDATA (XCAR (tem
)));
1256 /* Remove variable names without values. */
1260 while (*q
!= 0 && strchr (*q
, '=') == NULL
)
1270 prepare_standard_handles (in
, out
, err
, handles
);
1271 set_process_dir (SDATA (current_dir
));
1272 /* Spawn the child. (See ntproc.c:Spawnve). */
1273 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1274 reset_standard_handles (in
, out
, err
, handles
);
1276 /* An error occurred while trying to spawn the process. */
1277 report_file_error ("Spawning child process", Qnil
);
1280 #else /* not WINDOWSNT */
1281 /* Make sure that in, out, and err are not actually already in
1282 descriptors zero, one, or two; this could happen if Emacs is
1283 started with its standard in, out, or error closed, as might
1286 int oin
= in
, oout
= out
;
1288 /* We have to avoid relocating the same descriptor twice! */
1290 in
= relocate_fd (in
, 3);
1295 out
= relocate_fd (out
, 3);
1299 else if (err
== oout
)
1302 err
= relocate_fd (err
, 3);
1316 if (err
!= in
&& err
!= out
)
1320 #ifndef SETPGRP_RELEASES_CTTY
1321 setpgrp (); /* No arguments but equivalent in this case */
1325 #endif /* not USG */
1327 /* setpgrp_of_tty is incorrect here; it uses input_fd. */
1330 /* execvp does not accept an environment arg so the only way
1331 to pass this environment is to set environ. Our caller
1332 is responsible for restoring the ambient value of environ. */
1334 execvp (new_argv
[0], new_argv
);
1336 emacs_write (1, "Can't exec program: ", 20);
1337 emacs_write (1, new_argv
[0], strlen (new_argv
[0]));
1338 emacs_write (1, "\n", 1);
1342 pid
= run_msdos_command (new_argv
, pwd_var
+ 4, in
, out
, err
, env
);
1345 /* An error occurred while trying to run the subprocess. */
1346 report_file_error ("Spawning child process", Qnil
);
1349 #endif /* not WINDOWSNT */
1353 /* Move the file descriptor FD so that its number is not less than MINFD.
1354 If the file descriptor is moved at all, the original is freed. */
1356 relocate_fd (int fd
, int minfd
)
1364 new = fcntl (fd
, F_DUPFD
, minfd
);
1368 /* Note that we hold the original FD open while we recurse,
1369 to guarantee we'll get a new FD if we need it. */
1370 new = relocate_fd (new, minfd
);
1374 const char *message_1
= "Error while setting up child: ";
1375 const char *errmessage
= strerror (errno
);
1376 const char *message_2
= "\n";
1377 emacs_write (2, message_1
, strlen (message_1
));
1378 emacs_write (2, errmessage
, strlen (errmessage
));
1379 emacs_write (2, message_2
, strlen (message_2
));
1386 #endif /* not WINDOWSNT */
1389 getenv_internal_1 (const char *var
, ptrdiff_t varlen
, char **value
,
1390 ptrdiff_t *valuelen
, Lisp_Object env
)
1392 for (; CONSP (env
); env
= XCDR (env
))
1394 Lisp_Object entry
= XCAR (env
);
1396 && SBYTES (entry
) >= varlen
1398 /* NT environment variables are case insensitive. */
1399 && ! strnicmp (SDATA (entry
), var
, varlen
)
1400 #else /* not WINDOWSNT */
1401 && ! memcmp (SDATA (entry
), var
, varlen
)
1402 #endif /* not WINDOWSNT */
1405 if (SBYTES (entry
) > varlen
&& SREF (entry
, varlen
) == '=')
1407 *value
= SSDATA (entry
) + (varlen
+ 1);
1408 *valuelen
= SBYTES (entry
) - (varlen
+ 1);
1411 else if (SBYTES (entry
) == varlen
)
1413 /* Lone variable names in Vprocess_environment mean that
1414 variable should be removed from the environment. */
1424 getenv_internal (const char *var
, ptrdiff_t varlen
, char **value
,
1425 ptrdiff_t *valuelen
, Lisp_Object frame
)
1427 /* Try to find VAR in Vprocess_environment first. */
1428 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1429 Vprocess_environment
))
1430 return *value
? 1 : 0;
1432 /* For DISPLAY try to get the values from the frame or the initial env. */
1433 if (strcmp (var
, "DISPLAY") == 0)
1436 = Fframe_parameter (NILP (frame
) ? selected_frame
: frame
, Qdisplay
);
1437 if (STRINGP (display
))
1439 *value
= SSDATA (display
);
1440 *valuelen
= SBYTES (display
);
1443 /* If still not found, Look for DISPLAY in Vinitial_environment. */
1444 if (getenv_internal_1 (var
, varlen
, value
, valuelen
,
1445 Vinitial_environment
))
1446 return *value
? 1 : 0;
1452 DEFUN ("getenv-internal", Fgetenv_internal
, Sgetenv_internal
, 1, 2, 0,
1453 doc
: /* Get the value of environment variable VARIABLE.
1454 VARIABLE should be a string. Value is nil if VARIABLE is undefined in
1455 the environment. Otherwise, value is a string.
1457 This function searches `process-environment' for VARIABLE.
1459 If optional parameter ENV is a list, then search this list instead of
1460 `process-environment', and return t when encountering a negative entry
1461 \(an entry for a variable with no value). */)
1462 (Lisp_Object variable
, Lisp_Object env
)
1467 CHECK_STRING (variable
);
1470 if (getenv_internal_1 (SSDATA (variable
), SBYTES (variable
),
1471 &value
, &valuelen
, env
))
1472 return value
? make_string (value
, valuelen
) : Qt
;
1476 else if (getenv_internal (SSDATA (variable
), SBYTES (variable
),
1477 &value
, &valuelen
, env
))
1478 return make_string (value
, valuelen
);
1483 /* A version of getenv that consults the Lisp environment lists,
1484 easily callable from C. */
1486 egetenv (const char *var
)
1491 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
, Qnil
))
1498 /* This is run before init_cmdargs. */
1501 init_callproc_1 (void)
1503 char *data_dir
= egetenv ("EMACSDATA");
1504 char *doc_dir
= egetenv ("EMACSDOC");
1507 = Ffile_name_as_directory (build_string (data_dir
? data_dir
1510 = Ffile_name_as_directory (build_string (doc_dir
? doc_dir
1513 /* Check the EMACSPATH environment variable, defaulting to the
1514 PATH_EXEC path from epaths.h. */
1515 Vexec_path
= decode_env_path ("EMACSPATH", PATH_EXEC
);
1516 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1517 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1520 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1523 init_callproc (void)
1525 char *data_dir
= egetenv ("EMACSDATA");
1528 Lisp_Object tempdir
;
1530 if (!NILP (Vinstallation_directory
))
1532 /* Add to the path the lib-src subdir of the installation dir. */
1534 tem
= Fexpand_file_name (build_string ("lib-src"),
1535 Vinstallation_directory
);
1537 /* MSDOS uses wrapped binaries, so don't do this. */
1538 if (NILP (Fmember (tem
, Vexec_path
)))
1540 Vexec_path
= decode_env_path ("EMACSPATH", PATH_EXEC
);
1541 Vexec_path
= Fcons (tem
, Vexec_path
);
1542 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1545 Vexec_directory
= Ffile_name_as_directory (tem
);
1546 #endif /* not DOS_NT */
1548 /* Maybe use ../etc as well as ../lib-src. */
1551 tem
= Fexpand_file_name (build_string ("etc"),
1552 Vinstallation_directory
);
1553 Vdoc_directory
= Ffile_name_as_directory (tem
);
1557 /* Look for the files that should be in etc. We don't use
1558 Vinstallation_directory, because these files are never installed
1559 near the executable, and they are never in the build
1560 directory when that's different from the source directory.
1562 Instead, if these files are not in the nominal place, we try the
1563 source directory. */
1566 Lisp_Object tem
, tem1
, srcdir
;
1568 srcdir
= Fexpand_file_name (build_string ("../src/"),
1569 build_string (PATH_DUMPLOADSEARCH
));
1570 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1571 tem1
= Ffile_exists_p (tem
);
1572 if (!NILP (Fequal (srcdir
, Vinvocation_directory
)) || NILP (tem1
))
1575 newdir
= Fexpand_file_name (build_string ("../etc/"),
1576 build_string (PATH_DUMPLOADSEARCH
));
1577 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1578 tem1
= Ffile_exists_p (tem
);
1580 Vdata_directory
= newdir
;
1588 tempdir
= Fdirectory_file_name (Vexec_directory
);
1589 if (access (SSDATA (tempdir
), 0) < 0)
1590 dir_warning ("Warning: arch-dependent data dir (%s) does not exist.\n",
1594 tempdir
= Fdirectory_file_name (Vdata_directory
);
1595 if (access (SSDATA (tempdir
), 0) < 0)
1596 dir_warning ("Warning: arch-independent data dir (%s) does not exist.\n",
1599 sh
= (char *) getenv ("SHELL");
1600 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1603 Vshared_game_score_directory
= Qnil
;
1605 Vshared_game_score_directory
= build_string (PATH_GAME
);
1606 if (NILP (Ffile_directory_p (Vshared_game_score_directory
)))
1607 Vshared_game_score_directory
= Qnil
;
1612 set_initial_environment (void)
1615 for (envp
= environ
; *envp
; envp
++)
1616 Vprocess_environment
= Fcons (build_string (*envp
),
1617 Vprocess_environment
);
1618 /* Ideally, the `copy' shouldn't be necessary, but it seems it's frequent
1619 to use `delete' and friends on process-environment. */
1620 Vinitial_environment
= Fcopy_sequence (Vprocess_environment
);
1624 syms_of_callproc (void)
1627 Vtemp_file_name_pattern
= build_string ("emacsXXXXXX");
1628 #elif defined (WINDOWSNT)
1629 Vtemp_file_name_pattern
= build_string ("emXXXXXX");
1631 Vtemp_file_name_pattern
= build_string ("detmp.XXX");
1633 staticpro (&Vtemp_file_name_pattern
);
1635 DEFVAR_LISP ("shell-file-name", Vshell_file_name
,
1636 doc
: /* *File name to load inferior shells from.
1637 Initialized from the SHELL environment variable, or to a system-dependent
1638 default if SHELL is not set. */);
1640 DEFVAR_LISP ("exec-path", Vexec_path
,
1641 doc
: /* *List of directories to search programs to run in subprocesses.
1642 Each element is a string (directory name) or nil (try default directory). */);
1644 DEFVAR_LISP ("exec-suffixes", Vexec_suffixes
,
1645 doc
: /* *List of suffixes to try to find executable file names.
1646 Each element is a string. */);
1647 Vexec_suffixes
= Qnil
;
1649 DEFVAR_LISP ("exec-directory", Vexec_directory
,
1650 doc
: /* Directory for executables for Emacs to invoke.
1651 More generally, this includes any architecture-dependent files
1652 that are built and installed from the Emacs distribution. */);
1654 DEFVAR_LISP ("data-directory", Vdata_directory
,
1655 doc
: /* Directory of machine-independent files that come with GNU Emacs.
1656 These are files intended for Emacs to use while it runs. */);
1658 DEFVAR_LISP ("doc-directory", Vdoc_directory
,
1659 doc
: /* Directory containing the DOC file that comes with GNU Emacs.
1660 This is usually the same as `data-directory'. */);
1662 DEFVAR_LISP ("configure-info-directory", Vconfigure_info_directory
,
1663 doc
: /* For internal use by the build procedure only.
1664 This is the name of the directory in which the build procedure installed
1665 Emacs's info files; the default value for `Info-default-directory-list'
1667 Vconfigure_info_directory
= build_string (PATH_INFO
);
1669 DEFVAR_LISP ("shared-game-score-directory", Vshared_game_score_directory
,
1670 doc
: /* Directory of score files for games which come with GNU Emacs.
1671 If this variable is nil, then Emacs is unable to use a shared directory. */);
1673 Vshared_game_score_directory
= Qnil
;
1675 Vshared_game_score_directory
= build_string (PATH_GAME
);
1678 DEFVAR_LISP ("initial-environment", Vinitial_environment
,
1679 doc
: /* List of environment variables inherited from the parent process.
1680 Each element should be a string of the form ENVVARNAME=VALUE.
1681 The elements must normally be decoded (using `locale-coding-system') for use. */);
1682 Vinitial_environment
= Qnil
;
1684 DEFVAR_LISP ("process-environment", Vprocess_environment
,
1685 doc
: /* List of overridden environment variables for subprocesses to inherit.
1686 Each element should be a string of the form ENVVARNAME=VALUE.
1688 Entries in this list take precedence to those in the frame-local
1689 environments. Therefore, let-binding `process-environment' is an easy
1690 way to temporarily change the value of an environment variable,
1691 irrespective of where it comes from. To use `process-environment' to
1692 remove an environment variable, include only its name in the list,
1695 This variable is set to nil when Emacs starts.
1697 If multiple entries define the same variable, the first one always
1700 Non-ASCII characters are encoded according to the initial value of
1701 `locale-coding-system', i.e. the elements must normally be decoded for
1704 See `setenv' and `getenv'. */);
1705 Vprocess_environment
= Qnil
;
1707 defsubr (&Scall_process
);
1708 defsubr (&Sgetenv_internal
);
1709 defsubr (&Scall_process_region
);