1 /* Synchronous subprocess invocation for GNU Emacs.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
29 extern char *strerror ();
31 /* Define SIGCHLD as an alias for SIGCLD. */
33 #if !defined (SIGCHLD) && defined (SIGCLD)
34 #define SIGCHLD SIGCLD
37 #include <sys/types.h>
41 #define INCLUDED_FCNTL
48 #include <stdlib.h> /* for proper declaration of environ */
51 #define _P_NOWAIT 1 /* from process.h */
54 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
56 #define INCLUDED_FCNTL
59 #include <sys/param.h>
78 #include "syssignal.h"
82 extern noshare
char **environ
;
84 extern char **environ
;
87 #define max(a, b) ((a) > (b) ? (a) : (b))
90 /* When we are starting external processes we need to know whether they
91 take binary input (no conversion) or text input (\n is converted to
92 \r\n). Similar for output: if newlines are written as \r\n then it's
93 text process output, otherwise it's binary. */
94 Lisp_Object Vbinary_process_input
;
95 Lisp_Object Vbinary_process_output
;
98 Lisp_Object Vexec_path
, Vexec_directory
, Vdata_directory
, Vdoc_directory
;
99 Lisp_Object Vconfigure_info_directory
;
100 Lisp_Object Vtemp_file_name_pattern
;
102 Lisp_Object Vshell_file_name
;
104 Lisp_Object Vprocess_environment
;
107 Lisp_Object Qbuffer_file_type
;
110 /* True iff we are about to fork off a synchronous process or if we
111 are waiting for it. */
112 int synch_process_alive
;
114 /* Nonzero => this is a string explaining death of synchronous subprocess. */
115 char *synch_process_death
;
117 /* If synch_process_death is zero,
118 this is exit code of synchronous subprocess. */
119 int synch_process_retcode
;
121 extern Lisp_Object Vdoc_file_name
;
123 extern Lisp_Object Vfile_name_coding_system
, Vdefault_file_name_coding_system
;
125 /* Clean up when exiting Fcall_process.
126 On MSDOS, delete the temporary file on any kind of termination.
127 On Unix, kill the process and any children on termination by signal. */
129 /* Nonzero if this is termination due to exit. */
130 static int call_process_exited
;
132 #ifndef VMS /* VMS version is in vmsproc.c. */
135 call_process_kill (fdpid
)
138 close (XFASTINT (Fcar (fdpid
)));
139 EMACS_KILLPG (XFASTINT (Fcdr (fdpid
)), SIGKILL
);
140 synch_process_alive
= 0;
145 call_process_cleanup (fdpid
)
149 /* for MSDOS fdpid is really (fd . tempfile) */
150 register Lisp_Object file
;
152 close (XFASTINT (Fcar (fdpid
)));
153 if (strcmp (XSTRING (file
)-> data
, NULL_DEVICE
) != 0)
154 unlink (XSTRING (file
)->data
);
155 #else /* not MSDOS */
156 register int pid
= XFASTINT (Fcdr (fdpid
));
159 if (call_process_exited
)
161 close (XFASTINT (Fcar (fdpid
)));
165 if (EMACS_KILLPG (pid
, SIGINT
) == 0)
167 int count
= specpdl_ptr
- specpdl
;
168 record_unwind_protect (call_process_kill
, fdpid
);
169 message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
172 wait_for_termination (pid
);
174 specpdl_ptr
= specpdl
+ count
; /* Discard the unwind protect. */
175 message1 ("Waiting for process to die...done");
177 synch_process_alive
= 0;
178 close (XFASTINT (Fcar (fdpid
)));
179 #endif /* not MSDOS */
183 DEFUN ("call-process", Fcall_process
, Scall_process
, 1, MANY
, 0,
184 "Call PROGRAM synchronously in separate process.\n\
185 The program's input comes from file INFILE (nil means `/dev/null').\n\
186 Insert output in BUFFER before point; t means current buffer;\n\
187 nil for BUFFER means discard it; 0 means discard and don't wait.\n\
188 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,\n\
189 REAL-BUFFER says what to do with standard output, as above,\n\
190 while STDERR-FILE says what to do with standard error in the child.\n\
191 STDERR-FILE may be nil (discard standard error output),\n\
192 t (mix it with ordinary output), or a file name string.\n\
194 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
195 Remaining arguments are strings passed as command arguments to PROGRAM.\n\
197 If BUFFER is 0, `call-process' returns immediately with value nil.\n\
198 Otherwise it waits for PROGRAM to terminate\n\
199 and returns a numeric exit status or a signal description string.\n\
200 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.")
203 register Lisp_Object
*args
;
205 Lisp_Object infile
, buffer
, current_dir
, display
, path
;
212 int count
= specpdl_ptr
- specpdl
;
214 register unsigned char **new_argv
215 = (unsigned char **) alloca ((max (2, nargs
- 2)) * sizeof (char *));
216 struct buffer
*old
= current_buffer
;
217 /* File to use for stderr in the child.
218 t means use same as standard output. */
219 Lisp_Object error_file
;
220 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
221 char *outf
, *tempfile
;
227 struct coding_system process_coding
; /* coding-system of process output */
228 struct coding_system argument_coding
; /* coding-system of arguments */
230 CHECK_STRING (args
[0], 0);
235 /* Without asynchronous processes we cannot have BUFFER == 0. */
236 if (nargs
>= 3 && INTEGERP (args
[2]))
237 error ("Operating system cannot handle asynchronous subprocesses");
238 #endif /* subprocesses */
240 /* Decide the coding-system for giving arguments and reading process
243 Lisp_Object val
, *args2
;
244 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
245 Lisp_Object coding_systems
= Qt
;
248 /* If arguments are supplied, we may have to encode them. */
253 for (i
= 4; i
< nargs
; i
++)
254 if (STRING_MULTIBYTE (args
[i
]))
257 if (!NILP (Vcoding_system_for_write
))
258 val
= Vcoding_system_for_write
;
259 else if (! must_encode
)
263 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
264 args2
[0] = Qcall_process
;
265 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
266 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
267 if (CONSP (coding_systems
))
268 val
= XCONS (coding_systems
)->cdr
;
269 else if (CONSP (Vdefault_process_coding_system
))
270 val
= XCONS (Vdefault_process_coding_system
)->cdr
;
274 setup_coding_system (Fcheck_coding_system (val
), &argument_coding
);
277 /* If BUFFER is nil, we must read process output once and then
278 discard it, so setup coding system but with nil. If BUFFER is
279 an integer, we can discard it without reading. */
280 if (nargs
< 3 || NILP (args
[2]))
281 setup_coding_system (Qnil
, &process_coding
);
282 else if (!INTEGERP (args
[2]))
285 if (!NILP (Vcoding_system_for_read
))
286 val
= Vcoding_system_for_read
;
287 else if (NILP (current_buffer
->enable_multibyte_characters
))
291 if (!EQ (coding_systems
, Qt
))
293 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
294 args2
[0] = Qcall_process
;
295 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
297 = Ffind_operation_coding_system (nargs
+ 1, args2
);
299 if (CONSP (coding_systems
))
300 val
= XCONS (coding_systems
)->car
;
301 else if (CONSP (Vdefault_process_coding_system
))
302 val
= XCONS (Vdefault_process_coding_system
)->car
;
306 setup_coding_system (Fcheck_coding_system (val
), &process_coding
);
308 /* On MSDOS, if the user did not ask for binary, treat it as
309 "text" which means doing CRLF conversion. Otherwise, leave
312 Note that ``binary'' here only means whether EOLs should or
313 should not be converted, since that's what Vbinary_process_XXXput
314 meant in the days before the coding systems were introduced.
316 For other conversions, the caller should set coding-system
317 variables explicitly, or rely on auto-detection. */
319 /* FIXME: this probably should be moved into the guts of
320 `Ffind_operation_coding_system' for the case of `call-process'. */
321 if (NILP (Vbinary_process_output
))
323 process_coding
.eol_type
= CODING_EOL_CRLF
;
324 if (process_coding
.type
== coding_type_no_conversion
)
325 /* FIXME: should we set type to undecided? */
326 process_coding
.type
= coding_type_emacs_mule
;
329 process_coding
.eol_type
= CODING_EOL_LF
;
334 if (nargs
>= 2 && ! NILP (args
[1]))
336 infile
= Fexpand_file_name (args
[1], current_buffer
->directory
);
337 CHECK_STRING (infile
, 1);
340 infile
= build_string (NULL_DEVICE
);
346 /* If BUFFER is a list, its meaning is
347 (BUFFER-FOR-STDOUT FILE-FOR-STDERR). */
350 if (CONSP (XCONS (buffer
)->cdr
))
352 Lisp_Object stderr_file
;
353 stderr_file
= XCONS (XCONS (buffer
)->cdr
)->car
;
355 if (NILP (stderr_file
) || EQ (Qt
, stderr_file
))
356 error_file
= stderr_file
;
358 error_file
= Fexpand_file_name (stderr_file
, Qnil
);
361 buffer
= XCONS (buffer
)->car
;
364 if (!(EQ (buffer
, Qnil
)
366 || XFASTINT (buffer
) == 0))
368 Lisp_Object spec_buffer
;
369 spec_buffer
= buffer
;
370 buffer
= Fget_buffer_create (buffer
);
371 /* Mention the buffer name for a better error message. */
373 CHECK_BUFFER (spec_buffer
, 2);
374 CHECK_BUFFER (buffer
, 2);
380 /* Make sure that the child will be able to chdir to the current
381 buffer's current directory, or its unhandled equivalent. We
382 can't just have the child check for an error when it does the
383 chdir, since it's in a vfork.
385 We have to GCPRO around this because Fexpand_file_name,
386 Funhandled_file_name_directory, and Ffile_accessible_directory_p
387 might call a file name handling function. The argument list is
388 protected by the caller, so all we really have to worry about is
391 struct gcpro gcpro1
, gcpro2
, gcpro3
;
393 current_dir
= current_buffer
->directory
;
395 GCPRO3 (infile
, buffer
, current_dir
);
398 = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir
),
400 if (NILP (Ffile_accessible_directory_p (current_dir
)))
401 report_file_error ("Setting current directory",
402 Fcons (current_buffer
->directory
, Qnil
));
407 display
= nargs
>= 4 ? args
[3] : Qnil
;
409 filefd
= open (XSTRING (infile
)->data
, O_RDONLY
, 0);
412 report_file_error ("Opening process input file", Fcons (infile
, Qnil
));
414 /* Search for program; barf if not found. */
418 GCPRO1 (current_dir
);
419 openp (Vexec_path
, args
[0], EXEC_SUFFIXES
, &path
, 1);
425 report_file_error ("Searching for program", Fcons (args
[0], Qnil
));
427 new_argv
[0] = XSTRING (path
)->data
;
432 for (i
= 4; i
< nargs
; i
++) CHECK_STRING (args
[i
], i
);
434 if (! CODING_REQUIRE_ENCODING (&argument_coding
))
436 for (i
= 4; i
< nargs
; i
++)
437 new_argv
[i
- 3] = XSTRING (args
[i
])->data
;
441 /* We must encode the arguments. */
442 struct gcpro gcpro1
, gcpro2
, gcpro3
;
444 GCPRO3 (infile
, buffer
, current_dir
);
445 for (i
= 4; i
< nargs
; i
++)
447 int size
= encoding_buffer_size (&argument_coding
,
448 XSTRING (args
[i
])->size_byte
);
449 unsigned char *dummy1
= (unsigned char *) alloca (size
);
452 /* The Irix 4.0 compiler barfs if we eliminate dummy. */
453 new_argv
[i
- 3] = dummy1
;
454 encode_coding (&argument_coding
,
455 XSTRING (args
[i
])->data
,
457 XSTRING (args
[i
])->size_byte
,
459 new_argv
[i
- 3][argument_coding
.produced
] = 0;
463 new_argv
[nargs
- 3] = 0;
468 #ifdef MSDOS /* MW, July 1993 */
469 if ((outf
= egetenv ("TMP")) || (outf
= egetenv ("TEMP")))
470 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
473 tempfile
= alloca (20);
476 dostounix_filename (tempfile
);
477 if (*tempfile
== '\0' || tempfile
[strlen (tempfile
) - 1] != '/')
478 strcat (tempfile
, "/");
479 strcat (tempfile
, "detmp.XXX");
482 outfilefd
= creat (tempfile
, S_IREAD
| S_IWRITE
);
486 report_file_error ("Opening process output file",
487 Fcons (build_string (tempfile
), Qnil
));
493 if (INTEGERP (buffer
))
494 fd
[1] = open (NULL_DEVICE
, O_WRONLY
), fd
[0] = -1;
501 /* Replaced by close_process_descs */
502 set_exclusive_use (fd
[0]);
507 /* child_setup must clobber environ in systems with true vfork.
508 Protect it from permanent change. */
509 register char **save_environ
= environ
;
510 register int fd1
= fd
[1];
513 #if 0 /* Some systems don't have sigblock. */
514 mask
= sigblock (sigmask (SIGCHLD
));
517 /* Record that we're about to create a synchronous process. */
518 synch_process_alive
= 1;
520 /* These vars record information from process termination.
521 Clear them now before process can possibly terminate,
522 to avoid timing error if process terminates soon. */
523 synch_process_death
= 0;
524 synch_process_retcode
= 0;
526 if (NILP (error_file
))
527 fd_error
= open (NULL_DEVICE
, O_WRONLY
);
528 else if (STRINGP (error_file
))
531 fd_error
= open (XSTRING (error_file
)->data
,
532 O_WRONLY
| O_TRUNC
| O_CREAT
| O_TEXT
,
534 #else /* not DOS_NT */
535 fd_error
= creat (XSTRING (error_file
)->data
, 0666);
536 #endif /* not DOS_NT */
549 report_file_error ("Cannot redirect stderr",
550 Fcons ((NILP (error_file
)
551 ? build_string (NULL_DEVICE
) : error_file
),
555 current_dir
= ENCODE_FILE (current_dir
);
557 #ifdef MSDOS /* MW, July 1993 */
558 /* ??? Someone who knows MSDOG needs to check whether this properly
559 closes all descriptors that it opens.
561 Note that run_msdos_command() actually returns the child process
562 exit status, not its PID, so we assign it to `synch_process_retcode'
564 pid
= run_msdos_command (new_argv
, current_dir
,
565 filefd
, outfilefd
, fd_error
);
567 /* Record that the synchronous process exited and note its
568 termination status. */
569 synch_process_alive
= 0;
570 synch_process_retcode
= pid
;
571 if (synch_process_retcode
< 0) /* means it couldn't be exec'ed */
572 synch_process_death
= strerror (errno
);
575 if (fd_error
!= outfilefd
)
577 fd1
= -1; /* No harm in closing that one! */
578 /* Since CRLF is converted to LF within `decode_coding', we can
579 always open a file with binary mode. */
580 fd
[0] = open (tempfile
, O_BINARY
);
585 report_file_error ("Cannot re-open temporary file", Qnil
);
587 #else /* not MSDOS */
589 pid
= child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
591 #else /* not WINDOWSNT */
601 #if defined (USG) && !defined (BSD_PGRPS)
606 child_setup (filefd
, fd1
, fd_error
, (char **) new_argv
,
609 #endif /* not WINDOWSNT */
611 /* The MSDOS case did this already. */
614 #endif /* not MSDOS */
616 environ
= save_environ
;
618 /* Close most of our fd's, but not fd[0]
619 since we will use that to read input from. */
621 if (fd1
>= 0 && fd1
!= fd_error
)
629 report_file_error ("Doing vfork", Qnil
);
632 if (INTEGERP (buffer
))
637 /* If Emacs has been built with asynchronous subprocess support,
638 we don't need to do this, I think because it will then have
639 the facilities for handling SIGCHLD. */
640 wait_without_blocking ();
641 #endif /* subprocesses */
645 /* Enable sending signal if user quits below. */
646 call_process_exited
= 0;
649 /* MSDOS needs different cleanup information. */
650 record_unwind_protect (call_process_cleanup
,
651 Fcons (make_number (fd
[0]), build_string (tempfile
)));
653 record_unwind_protect (call_process_cleanup
,
654 Fcons (make_number (fd
[0]), make_number (pid
)));
655 #endif /* not MSDOS */
658 if (BUFFERP (buffer
))
659 Fset_buffer (buffer
);
672 /* Repeatedly read until we've filled as much as possible
673 of the buffer size we have. But don't read
674 less than 1024--save that for the next bufferful. */
677 while (nread
< bufsize
- 1024)
679 int this_read
= read (fd
[0], bufptr
+ nread
, bufsize
- nread
);
692 /* Now NREAD is the total amount of data in the buffer. */
693 if (nread
== carryover
)
694 /* Here, just tell decode_coding that we are processing the
695 last block. We break the loop after decoding. */
696 process_coding
.mode
|= CODING_MODE_LAST_BLOCK
;
699 total_read
+= nread
- carryover
;
703 if (process_coding
.type
== coding_type_no_conversion
)
704 insert (bufptr
, nread
);
706 { /* We have to decode the input. */
707 int size
= decoding_buffer_size (&process_coding
, nread
);
708 char *decoding_buf
= get_conversion_buffer (size
);
710 decode_coding (&process_coding
, bufptr
, decoding_buf
,
712 if (process_coding
.produced
> 0)
713 insert (decoding_buf
, process_coding
.produced
);
714 carryover
= nread
- process_coding
.consumed
;
717 /* As CARRYOVER should not be that large, we had
718 better avoid overhead of bcopy. */
719 char *p
= bufptr
+ process_coding
.consumed
;
720 char *pend
= p
+ carryover
;
723 while (p
< pend
) *dst
++ = *p
++;
727 if (process_coding
.mode
& CODING_MODE_LAST_BLOCK
)
730 insert (bufptr
, carryover
);
734 /* Make the buffer bigger as we continue to read more data,
736 if (bufsize
< 64 * 1024 && total_read
> 32 * bufsize
)
739 bufptr
= (char *) alloca (bufsize
);
742 if (!NILP (display
) && INTERACTIVE
)
745 prepare_menu_bars ();
747 redisplay_preserve_echo_area ();
755 Vlast_coding_system_used
= process_coding
.symbol
;
757 /* Wait for it to terminate, unless it already has. */
758 wait_for_termination (pid
);
762 set_buffer_internal (old
);
764 /* Don't kill any children that the subprocess may have left behind
766 call_process_exited
= 1;
768 unbind_to (count
, Qnil
);
770 if (synch_process_death
)
771 return build_string (synch_process_death
);
772 return make_number (synch_process_retcode
);
777 delete_temp_file (name
)
780 /* Use Fdelete_file (indirectly) because that runs a file name handler.
781 We did that when writing the file, so we should do so when deleting. */
782 internal_delete_file (name
);
785 DEFUN ("call-process-region", Fcall_process_region
, Scall_process_region
,
787 "Send text from START to END to a synchronous process running PROGRAM.\n\
788 Delete the text if fourth arg DELETE is non-nil.\n\
790 Insert output in BUFFER before point; t means current buffer;\n\
791 nil for BUFFER means discard it; 0 means discard and don't wait.\n\
792 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,\n\
793 REAL-BUFFER says what to do with standard output, as above,\n\
794 while STDERR-FILE says what to do with standard error in the child.\n\
795 STDERR-FILE may be nil (discard standard error output),\n\
796 t (mix it with ordinary output), or a file name string.\n\
798 Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
799 Remaining args are passed to PROGRAM at startup as command args.\n\
801 If BUFFER is nil, `call-process-region' returns immediately with value nil.\n\
802 Otherwise it waits for PROGRAM to terminate\n\
803 and returns a numeric exit status or a signal description string.\n\
804 If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.")
807 register Lisp_Object
*args
;
810 Lisp_Object filename_string
;
811 register Lisp_Object start
, end
;
812 int count
= specpdl_ptr
- specpdl
;
813 /* Qt denotes we have not yet called Ffind_operation_coding_system. */
814 Lisp_Object coding_systems
= Qt
;
815 Lisp_Object val
, *args2
;
821 if ((outf
= egetenv ("TMP")) || (outf
= egetenv ("TEMP")))
822 strcpy (tempfile
= alloca (strlen (outf
) + 20), outf
);
825 tempfile
= alloca (20);
828 if (!IS_DIRECTORY_SEP (tempfile
[strlen (tempfile
) - 1]))
829 strcat (tempfile
, "/");
830 if ('/' == DIRECTORY_SEP
)
831 dostounix_filename (tempfile
);
833 unixtodos_filename (tempfile
);
835 strcat (tempfile
, "emXXXXXX");
837 strcat (tempfile
, "detmp.XXX");
839 #else /* not DOS_NT */
840 char *tempfile
= (char *) alloca (XSTRING (Vtemp_file_name_pattern
)->size_byte
+ 1);
841 bcopy (XSTRING (Vtemp_file_name_pattern
)->data
, tempfile
,
842 XSTRING (Vtemp_file_name_pattern
)->size_byte
+ 1);
843 #endif /* not DOS_NT */
847 filename_string
= build_string (tempfile
);
848 GCPRO1 (filename_string
);
851 /* Decide coding-system of the contents of the temporary file. */
853 /* This is to cause find-buffer-file-type-coding-system (see
854 dos-w32.el) to choose correct EOL translation for write-region. */
855 specbind (Qbuffer_file_type
, Vbinary_process_input
);
857 if (!NILP (Vcoding_system_for_write
))
858 val
= Vcoding_system_for_write
;
859 else if (NILP (current_buffer
->enable_multibyte_characters
))
863 args2
= (Lisp_Object
*) alloca ((nargs
+ 1) * sizeof *args2
);
864 args2
[0] = Qcall_process_region
;
865 for (i
= 0; i
< nargs
; i
++) args2
[i
+ 1] = args
[i
];
866 coding_systems
= Ffind_operation_coding_system (nargs
+ 1, args2
);
867 if (CONSP (coding_systems
))
868 val
= XCONS (coding_systems
)->cdr
;
869 else if (CONSP (Vdefault_process_coding_system
))
870 val
= XCONS (Vdefault_process_coding_system
)->cdr
;
876 /* binary-process-input tells whether the buffer needs to be
877 written with EOL conversions, but it doesn't say anything
878 about the rest of text encoding. It takes effect whenever
879 the coding system doesn't otherwise specify what to do for
883 if (! NILP (Vbinary_process_input
))
884 val
= intern ("undecided-unix");
886 val
= intern ("undecided-dos");
888 else if (SYMBOLP (val
) && NILP (Vcoding_system_for_write
))
891 eolval
= Fget (val
, Qeol_type
);
892 if (VECTORP (eolval
) && XVECTOR (eolval
)->size
> 1)
893 /* Use element 1 (CRLF conversion) for "text",
894 and element 0 (LF conversion) for "binary". */
895 val
= XVECTOR (eolval
)->contents
[NILP (Vbinary_process_input
)];
899 specbind (intern ("coding-system-for-write"), val
);
900 Fwrite_region (start
, end
, filename_string
, Qnil
, Qlambda
, Qnil
, Qnil
);
902 /* Note that Fcall_process takes care of binding
903 coding-system-for-read. */
905 record_unwind_protect (delete_temp_file
, filename_string
);
908 Fdelete_region (start
, end
);
910 args
[3] = filename_string
;
912 RETURN_UNGCPRO (unbind_to (count
, Fcall_process (nargs
- 2, args
+ 2)));
915 #ifndef VMS /* VMS version is in vmsproc.c. */
917 /* This is the last thing run in a newly forked inferior
918 either synchronous or asynchronous.
919 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
920 Initialize inferior's priority, pgrp, connected dir and environment.
921 then exec another program based on new_argv.
923 This function may change environ for the superior process.
924 Therefore, the superior process must save and restore the value
925 of environ around the vfork and the call to this function.
927 ENV is the environment for the subprocess.
929 SET_PGRP is nonzero if we should put the subprocess into a separate
932 CURRENT_DIR is an elisp string giving the path of the current
933 directory the subprocess should have. Since we can't really signal
934 a decent error from within the child, this should be verified as an
935 executable directory by the parent. */
937 child_setup (in
, out
, err
, new_argv
, set_pgrp
, current_dir
)
939 register char **new_argv
;
941 Lisp_Object current_dir
;
944 /* The MSDOS port of gcc cannot fork, vfork, ... so we must call system
946 #else /* not MSDOS */
952 #endif /* WINDOWSNT */
956 #ifdef SET_EMACS_PRIORITY
958 extern int emacs_priority
;
960 if (emacs_priority
< 0)
961 nice (- emacs_priority
);
966 /* Close Emacs's descriptors that this process should not have. */
967 close_process_descs ();
971 /* Note that use of alloca is always safe here. It's obvious for systems
972 that do not have true vfork or that have true (stack) alloca.
973 If using vfork and C_ALLOCA it is safe because that changes
974 the superior's static variables as if the superior had done alloca
975 and will be cleaned up in the usual way. */
980 i
= XSTRING (current_dir
)->size_byte
;
981 pwd_var
= (char *) alloca (i
+ 6);
983 bcopy ("PWD=", pwd_var
, 4);
984 bcopy (XSTRING (current_dir
)->data
, temp
, i
);
985 if (!IS_DIRECTORY_SEP (temp
[i
- 1])) temp
[i
++] = DIRECTORY_SEP
;
989 /* We can't signal an Elisp error here; we're in a vfork. Since
990 the callers check the current directory before forking, this
991 should only return an error if the directory's permissions
992 are changed between the check and this chdir, but we should
994 if (chdir (temp
) < 0)
998 /* Strip trailing slashes for PWD, but leave "/" and "//" alone. */
999 while (i
> 2 && IS_DIRECTORY_SEP (temp
[i
- 1]))
1003 /* Set `env' to a vector of the strings in Vprocess_environment. */
1005 register Lisp_Object tem
;
1006 register char **new_env
;
1007 register int new_length
;
1010 for (tem
= Vprocess_environment
;
1011 CONSP (tem
) && STRINGP (XCONS (tem
)->car
);
1012 tem
= XCONS (tem
)->cdr
)
1015 /* new_length + 2 to include PWD and terminating 0. */
1016 env
= new_env
= (char **) alloca ((new_length
+ 2) * sizeof (char *));
1018 /* If we have a PWD envvar, pass one down,
1019 but with corrected value. */
1021 *new_env
++ = pwd_var
;
1023 /* Copy the Vprocess_environment strings into new_env. */
1024 for (tem
= Vprocess_environment
;
1025 CONSP (tem
) && STRINGP (XCONS (tem
)->car
);
1026 tem
= XCONS (tem
)->cdr
)
1029 char *string
= (char *) XSTRING (XCONS (tem
)->car
)->data
;
1030 /* See if this string duplicates any string already in the env.
1031 If so, don't put it in.
1032 When an env var has multiple definitions,
1033 we keep the definition that comes first in process-environment. */
1034 for (; ep
!= new_env
; ep
++)
1036 char *p
= *ep
, *q
= string
;
1040 /* The string is malformed; might as well drop it. */
1049 *new_env
++ = string
;
1055 prepare_standard_handles (in
, out
, err
, handles
);
1056 set_process_dir (XSTRING (current_dir
)->data
);
1057 #else /* not WINDOWSNT */
1058 /* Make sure that in, out, and err are not actually already in
1059 descriptors zero, one, or two; this could happen if Emacs is
1060 started with its standard in, out, or error closed, as might
1063 int oin
= in
, oout
= out
;
1065 /* We have to avoid relocating the same descriptor twice! */
1067 in
= relocate_fd (in
, 3);
1072 out
= relocate_fd (out
, 3);
1076 else if (err
== oout
)
1079 err
= relocate_fd (err
, 3);
1092 #endif /* not WINDOWSNT */
1094 #if defined(USG) && !defined(BSD_PGRPS)
1095 #ifndef SETPGRP_RELEASES_CTTY
1096 setpgrp (); /* No arguments but equivalent in this case */
1101 /* setpgrp_of_tty is incorrect here; it uses input_fd. */
1102 EMACS_SET_TTY_PGRP (0, &pid
);
1105 something missing here
;
1109 /* Spawn the child. (See ntproc.c:Spawnve). */
1110 cpid
= spawnve (_P_NOWAIT
, new_argv
[0], new_argv
, env
);
1111 reset_standard_handles (in
, out
, err
, handles
);
1113 /* An error occurred while trying to spawn the process. */
1114 report_file_error ("Spawning child process", Qnil
);
1116 #else /* not WINDOWSNT */
1117 /* execvp does not accept an environment arg so the only way
1118 to pass this environment is to set environ. Our caller
1119 is responsible for restoring the ambient value of environ. */
1121 execvp (new_argv
[0], new_argv
);
1123 write (1, "Can't exec program: ", 20);
1124 write (1, new_argv
[0], strlen (new_argv
[0]));
1127 #endif /* not WINDOWSNT */
1128 #endif /* not MSDOS */
1131 /* Move the file descriptor FD so that its number is not less than MIN.
1132 If the file descriptor is moved at all, the original is freed. */
1134 relocate_fd (fd
, min
)
1144 char *message1
= "Error while setting up child: ";
1145 char *errmessage
= strerror (errno
);
1146 char *message2
= "\n";
1147 write (2, message1
, strlen (message1
));
1148 write (2, errmessage
, strlen (errmessage
));
1149 write (2, message2
, strlen (message2
));
1152 /* Note that we hold the original FD open while we recurse,
1153 to guarantee we'll get a new FD if we need it. */
1154 new = relocate_fd (new, min
);
1161 getenv_internal (var
, varlen
, value
, valuelen
)
1169 for (scan
= Vprocess_environment
; CONSP (scan
); scan
= XCONS (scan
)->cdr
)
1173 entry
= XCONS (scan
)->car
;
1175 && XSTRING (entry
)->size_byte
> varlen
1176 && XSTRING (entry
)->data
[varlen
] == '='
1178 /* NT environment variables are case insensitive. */
1179 && ! strnicmp (XSTRING (entry
)->data
, var
, varlen
)
1180 #else /* not WINDOWSNT */
1181 && ! bcmp (XSTRING (entry
)->data
, var
, varlen
)
1182 #endif /* not WINDOWSNT */
1185 *value
= (char *) XSTRING (entry
)->data
+ (varlen
+ 1);
1186 *valuelen
= XSTRING (entry
)->size_byte
- (varlen
+ 1);
1194 DEFUN ("getenv", Fgetenv
, Sgetenv
, 1, 1, 0,
1195 "Return the value of environment variable VAR, as a string.\n\
1196 VAR should be a string. Value is nil if VAR is undefined in the environment.\n\
1197 This function consults the variable ``process-environment'' for its value.")
1204 CHECK_STRING (var
, 0);
1205 if (getenv_internal (XSTRING (var
)->data
, XSTRING (var
)->size_byte
,
1207 return make_string (value
, valuelen
);
1212 /* A version of getenv that consults process_environment, easily
1221 if (getenv_internal (var
, strlen (var
), &value
, &valuelen
))
1227 #endif /* not VMS */
1229 /* This is run before init_cmdargs. */
1233 char *data_dir
= egetenv ("EMACSDATA");
1234 char *doc_dir
= egetenv ("EMACSDOC");
1237 = Ffile_name_as_directory (build_string (data_dir
? data_dir
1240 = Ffile_name_as_directory (build_string (doc_dir
? doc_dir
1243 /* Check the EMACSPATH environment variable, defaulting to the
1244 PATH_EXEC path from paths.h. */
1245 Vexec_path
= decode_env_path ("EMACSPATH", PATH_EXEC
);
1246 Vexec_directory
= Ffile_name_as_directory (Fcar (Vexec_path
));
1247 Vexec_path
= nconc2 (decode_env_path ("PATH", ""), Vexec_path
);
1250 /* This is run after init_cmdargs, when Vinstallation_directory is valid. */
1254 char *data_dir
= egetenv ("EMACSDATA");
1257 Lisp_Object tempdir
;
1259 if (initialized
&& !NILP (Vinstallation_directory
))
1261 /* Add to the path the lib-src subdir of the installation dir. */
1263 tem
= Fexpand_file_name (build_string ("lib-src"),
1264 Vinstallation_directory
);
1265 if (NILP (Fmember (tem
, Vexec_path
)))
1268 /* MSDOS uses wrapped binaries, so don't do this. */
1269 Vexec_path
= nconc2 (Vexec_path
, Fcons (tem
, Qnil
));
1270 Vexec_directory
= Ffile_name_as_directory (tem
);
1271 #endif /* not DOS_NT */
1274 /* Maybe use ../etc as well as ../lib-src. */
1277 tem
= Fexpand_file_name (build_string ("etc"),
1278 Vinstallation_directory
);
1279 Vdoc_directory
= Ffile_name_as_directory (tem
);
1283 /* Look for the files that should be in etc. We don't use
1284 Vinstallation_directory, because these files are never installed
1285 near the executable, and they are never in the build
1286 directory when that's different from the source directory.
1288 Instead, if these files are not in the nominal place, we try the
1289 source directory. */
1292 Lisp_Object tem
, tem1
, newdir
;
1294 tem
= Fexpand_file_name (build_string ("GNU"), Vdata_directory
);
1295 tem1
= Ffile_exists_p (tem
);
1298 newdir
= Fexpand_file_name (build_string ("../etc/"),
1299 build_string (PATH_DUMPLOADSEARCH
));
1300 tem
= Fexpand_file_name (build_string ("GNU"), newdir
);
1301 tem1
= Ffile_exists_p (tem
);
1303 Vdata_directory
= newdir
;
1311 tempdir
= Fdirectory_file_name (Vexec_directory
);
1312 if (access (XSTRING (tempdir
)->data
, 0) < 0)
1313 dir_warning ("Warning: arch-dependent data dir (%s) does not exist.\n",
1317 tempdir
= Fdirectory_file_name (Vdata_directory
);
1318 if (access (XSTRING (tempdir
)->data
, 0) < 0)
1319 dir_warning ("Warning: arch-independent data dir (%s) does not exist.\n",
1323 Vshell_file_name
= build_string ("*dcl*");
1325 sh
= (char *) getenv ("SHELL");
1326 Vshell_file_name
= build_string (sh
? sh
: "/bin/sh");
1330 Vtemp_file_name_pattern
= build_string ("tmp:emacsXXXXXX.");
1332 if (getenv ("TMPDIR"))
1334 char *dir
= getenv ("TMPDIR");
1335 Vtemp_file_name_pattern
1336 = Fexpand_file_name (build_string ("emacsXXXXXX"),
1337 build_string (dir
));
1340 Vtemp_file_name_pattern
= build_string ("/tmp/emacsXXXXXX");
1344 set_process_environment ()
1346 register char **envp
;
1348 Vprocess_environment
= Qnil
;
1352 for (envp
= environ
; *envp
; envp
++)
1353 Vprocess_environment
= Fcons (build_string (*envp
),
1354 Vprocess_environment
);
1360 Qbuffer_file_type
= intern ("buffer-file-type");
1361 staticpro (&Qbuffer_file_type
);
1363 DEFVAR_LISP ("binary-process-input", &Vbinary_process_input
,
1364 "*If non-nil then new subprocesses are assumed to take binary input.");
1365 Vbinary_process_input
= Qnil
;
1367 DEFVAR_LISP ("binary-process-output", &Vbinary_process_output
,
1368 "*If non-nil then new subprocesses are assumed to produce binary output.");
1369 Vbinary_process_output
= Qnil
;
1372 DEFVAR_LISP ("shell-file-name", &Vshell_file_name
,
1373 "*File name to load inferior shells from.\n\
1374 Initialized from the SHELL environment variable.");
1376 DEFVAR_LISP ("exec-path", &Vexec_path
,
1377 "*List of directories to search programs to run in subprocesses.\n\
1378 Each element is a string (directory name) or nil (try default directory).");
1380 DEFVAR_LISP ("exec-directory", &Vexec_directory
,
1381 "Directory for executables for Emacs to invoke.\n\
1382 More generally, this includes any architecture-dependent files\n\
1383 that are built and installed from the Emacs distribution.");
1385 DEFVAR_LISP ("data-directory", &Vdata_directory
,
1386 "Directory of machine-independent files that come with GNU Emacs.\n\
1387 These are files intended for Emacs to use while it runs.");
1389 DEFVAR_LISP ("doc-directory", &Vdoc_directory
,
1390 "Directory containing the DOC file that comes with GNU Emacs.\n\
1391 This is usually the same as data-directory.");
1393 DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory
,
1394 "For internal use by the build procedure only.\n\
1395 This is the name of the directory in which the build procedure installed\n\
1396 Emacs's info files; the default value for Info-default-directory-list\n\
1398 Vconfigure_info_directory
= build_string (PATH_INFO
);
1400 DEFVAR_LISP ("temp-file-name-pattern", &Vtemp_file_name_pattern
,
1401 "Pattern for making names for temporary files.\n\
1402 This is used by `call-process-region'.");
1403 /* This variable is initialized in init_callproc. */
1405 DEFVAR_LISP ("process-environment", &Vprocess_environment
,
1406 "List of environment variables for subprocesses to inherit.\n\
1407 Each element should be a string of the form ENVVARNAME=VALUE.\n\
1408 The environment which Emacs inherits is placed in this variable\n\
1409 when Emacs starts.");
1412 defsubr (&Scall_process
);
1415 defsubr (&Scall_process_region
);