1 /* Fully extensible Emacs, running on Unix, intended for GNU.
2 Copyright (C) 1985,86,87,93,94,95,97,1998 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. */
28 #include <sys/types.h>
36 #include <sys/ioctl.h>
41 #include "intervals.h"
45 #include "blockinput.h"
46 #include "syssignal.h"
52 #include <sys/resource.h>
59 extern void malloc_warning ();
60 extern void set_time_zone_rule ();
61 extern char *index ();
62 extern char *strerror ();
64 /* Command line args from shell, as list of strings */
65 Lisp_Object Vcommand_line_args
;
67 /* The name under which Emacs was invoked, with any leading directory
69 Lisp_Object Vinvocation_name
;
71 /* The directory name from which Emacs was invoked. */
72 Lisp_Object Vinvocation_directory
;
74 /* The directory name in which to find subdirs such as lisp and etc.
75 nil means get them only from PATH_LOADSEARCH. */
76 Lisp_Object Vinstallation_directory
;
78 /* Hook run by `kill-emacs' before it does really anything. */
79 Lisp_Object Vkill_emacs_hook
;
82 /* Hooks for signal USR1 and USR2 handing */
83 Lisp_Object Vsignal_USR1_hook
;
85 Lisp_Object Vsignal_USR2_hook
;
89 /* Search path separator. */
90 Lisp_Object Vpath_separator
;
92 /* Set nonzero after Emacs has started up the first time.
93 Prevents reinitialization of the Lisp world and keymaps
94 on subsequent starts. */
97 #ifdef DOUG_LEA_MALLOC
98 /* Preserves a pointer to the memory allocated that copies that
99 static data inside glibc's malloc. */
100 void *malloc_state_ptr
;
101 /* From glibc, a routine that returns a copy of the malloc internal state. */
102 extern void *malloc_get_state ();
103 /* From glibc, a routine that overwrites the malloc internal state. */
104 extern void malloc_set_state ();
107 /* Variable whose value is symbol giving operating system type. */
108 Lisp_Object Vsystem_type
;
110 /* Variable whose value is string giving configuration built for. */
111 Lisp_Object Vsystem_configuration
;
113 /* Variable whose value is string giving configuration options,
114 for use when reporting bugs. */
115 Lisp_Object Vsystem_configuration_options
;
117 Lisp_Object Qfile_name_handler_alist
;
119 /* If non-zero, emacs should not attempt to use an window-specific code,
120 but instead should use the virtual terminal under which it was started */
121 int inhibit_window_system
;
123 /* If nonzero, set Emacs to run at this priority. This is also used
124 in child_setup and sys_suspend to make sure subshells run at normal
125 priority; Those functions have their own extern declaration. */
128 /* If non-zero a filter or a sentinel is running. Tested to save the match
129 data on the first attempt to change it inside asynchronous code. */
130 int running_asynch_code
;
134 extern int inherited_pgroup
;
137 #ifdef HAVE_X_WINDOWS
138 /* If non-zero, -d was specified, meaning we're using some window system. */
142 /* An address near the bottom of the stack.
143 Tells GC how to save a copy of the stack. */
146 #ifdef HAVE_WINDOW_SYSTEM
147 extern Lisp_Object Vwindow_system
;
148 #endif /* HAVE_WINDOW_SYSTEM */
150 extern Lisp_Object Vauto_save_list_file_name
;
152 #ifdef USG_SHARED_LIBRARIES
153 /* If nonzero, this is the place to put the end of the writable segment
156 unsigned int bss_end
= 0;
159 /* Nonzero means running Emacs without interactive terminal. */
163 /* Value of Lisp variable `noninteractive'.
164 Normally same as C variable `noninteractive'
165 but nothing terrible happens if user sets this one. */
169 /* Save argv and argc. */
173 static void sort_args ();
174 void syms_of_emacs ();
176 /* Signal code for the fatal signal that was received */
177 int fatal_error_code
;
179 /* Nonzero if handling a fatal error already */
180 int fatal_error_in_progress
;
183 int SIGUSR1_in_progress
=0;
185 handle_USR1_signal (sig
)
188 if (! SIGUSR1_in_progress
)
190 SIGUSR1_in_progress
= 1;
192 if (!NILP (Vrun_hooks
) && !noninteractive
)
193 call1 (Vrun_hooks
, intern ("signal-USR1-hook"));
195 SIGUSR1_in_progress
= 0;
200 int SIGUSR2_in_progress
=0;
202 handle_USR2_signal (sig
)
205 if (! SIGUSR2_in_progress
)
207 SIGUSR2_in_progress
= 1;
209 if (!NILP (Vrun_hooks
) && !noninteractive
)
210 call1 (Vrun_hooks
, intern ("signal-USR2-hook"));
212 SIGUSR2_in_progress
= 0;
218 /* Handle bus errors, illegal instruction, etc. */
220 fatal_error_signal (sig
)
223 fatal_error_code
= sig
;
224 signal (sig
, SIG_DFL
);
226 TOTALLY_UNBLOCK_INPUT
;
228 /* If fatal error occurs in code below, avoid infinite recursion. */
229 if (! fatal_error_in_progress
)
231 fatal_error_in_progress
= 1;
233 shut_down_emacs (sig
, 0, Qnil
);
237 LIB$
STOP (SS$_ABORT
);
239 /* Signal the same code; this time it will really be fatal.
240 Remember that since we're in a signal handler, the signal we're
241 going to send is probably blocked, so we have to unblock it if we
242 want to really receive it. */
244 sigunblock (sigmask (fatal_error_code
));
246 kill (getpid (), fatal_error_code
);
252 /* Handler for SIGDANGER. */
254 memory_warning_signal (sig
)
257 signal (sig
, memory_warning_signal
);
259 malloc_warning ("Operating system warns that virtual memory is running low.\n");
261 /* It might be unsafe to call do_auto_save now. */
262 force_auto_save_soon ();
266 /* We define abort, rather than using it from the library,
267 so that GDB can return from a breakpoint here.
268 MSDOS has its own definition on msdos.c */
274 kill (getpid (), SIGABRT
);
279 /* Code for dealing with Lisp access to the Unix command line */
282 init_cmdargs (argc
, argv
, skip_args
)
288 Lisp_Object name
, dir
, tem
;
289 int count
= specpdl_ptr
- specpdl
;
290 Lisp_Object raw_name
;
295 raw_name
= build_string (argv
[0]);
297 /* Add /: to the front of the name
298 if it would otherwise be treated as magic. */
299 tem
= Ffind_file_name_handler (raw_name
, Qt
);
301 raw_name
= concat2 (build_string ("/:"), raw_name
);
303 Vinvocation_name
= Ffile_name_nondirectory (raw_name
);
304 Vinvocation_directory
= Ffile_name_directory (raw_name
);
306 /* If we got no directory in argv[0], search PATH to find where
307 Emacs actually came from. */
308 if (NILP (Vinvocation_directory
))
311 int yes
= openp (Vexec_path
, Vinvocation_name
,
312 EXEC_SUFFIXES
, &found
, 1);
315 /* Add /: to the front of the name
316 if it would otherwise be treated as magic. */
317 tem
= Ffind_file_name_handler (found
, Qt
);
319 found
= concat2 (build_string ("/:"), found
);
320 Vinvocation_directory
= Ffile_name_directory (found
);
324 if (!NILP (Vinvocation_directory
)
325 && NILP (Ffile_name_absolute_p (Vinvocation_directory
)))
326 /* Emacs was started with relative path, like ./emacs.
328 Vinvocation_directory
= Fexpand_file_name (Vinvocation_directory
, Qnil
);
330 Vinstallation_directory
= Qnil
;
332 if (!NILP (Vinvocation_directory
))
334 dir
= Vinvocation_directory
;
335 name
= Fexpand_file_name (Vinvocation_name
, dir
);
338 Lisp_Object tem
, lib_src_exists
;
339 Lisp_Object etc_exists
, info_exists
;
341 /* See if dir contains subdirs for use by Emacs.
342 Check for the ones that would exist in a build directory,
343 not including lisp and info. */
344 tem
= Fexpand_file_name (build_string ("lib-src"), dir
);
345 lib_src_exists
= Ffile_exists_p (tem
);
348 /* MSDOS installations frequently remove lib-src, but we still
349 must set installation-directory, or else info won't find
350 its files (it uses the value of installation-directory). */
351 tem
= Fexpand_file_name (build_string ("info"), dir
);
352 info_exists
= Ffile_exists_p (tem
);
357 if (!NILP (lib_src_exists
) || !NILP (info_exists
))
359 tem
= Fexpand_file_name (build_string ("etc"), dir
);
360 etc_exists
= Ffile_exists_p (tem
);
361 if (!NILP (etc_exists
))
363 Vinstallation_directory
364 = Ffile_name_as_directory (dir
);
369 /* See if dir's parent contains those subdirs. */
370 tem
= Fexpand_file_name (build_string ("../lib-src"), dir
);
371 lib_src_exists
= Ffile_exists_p (tem
);
375 /* See the MSDOS commentary above. */
376 tem
= Fexpand_file_name (build_string ("../info"), dir
);
377 info_exists
= Ffile_exists_p (tem
);
382 if (!NILP (lib_src_exists
) || !NILP (info_exists
))
384 tem
= Fexpand_file_name (build_string ("../etc"), dir
);
385 etc_exists
= Ffile_exists_p (tem
);
386 if (!NILP (etc_exists
))
388 tem
= Fexpand_file_name (build_string (".."), dir
);
389 Vinstallation_directory
390 = Ffile_name_as_directory (tem
);
395 /* If the Emacs executable is actually a link,
396 next try the dir that the link points into. */
397 tem
= Ffile_symlink_p (name
);
400 name
= Fexpand_file_name (tem
, dir
);
401 dir
= Ffile_name_directory (name
);
408 Vcommand_line_args
= Qnil
;
410 for (i
= argc
- 1; i
>= 0; i
--)
412 if (i
== 0 || i
> skip_args
)
414 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
417 unbind_to (count
, Qnil
);
420 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
421 "Return the program name that was used to run Emacs.\n\
422 Any directory names are omitted.")
425 return Fcopy_sequence (Vinvocation_name
);
428 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
430 "Return the directory name in which the Emacs executable was located")
433 return Fcopy_sequence (Vinvocation_directory
);
438 #ifdef LINK_CRTL_SHARE
439 #ifdef SHARABLE_LIB_BUG
440 extern noshare
char **environ
;
441 #endif /* SHARABLE_LIB_BUG */
442 #endif /* LINK_CRTL_SHARE */
446 /* A valid but unlikely value for the TZ environment value.
447 It is OK (though a bit slower) if the user actually chooses this value. */
448 static char dump_tz
[] = "UtC0";
451 #ifndef ORDINARY_LINK
452 /* We don't include crtbegin.o and crtend.o in the link,
453 so these functions and variables might be missed.
454 Provide dummy definitions to avoid error.
455 (We don't have any real constructors or destructors.) */
457 #ifndef GCC_CTORS_IN_LIBC
458 void __do_global_ctors ()
460 void __do_global_ctors_aux ()
462 void __do_global_dtors ()
464 /* Linux has a bug in its library; avoid an error. */
466 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
468 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
469 #endif /* GCC_CTORS_IN_LIBC */
472 #endif /* __GNUC__ */
473 #endif /* ORDINARY_LINK */
475 /* Test whether the next argument in ARGV matches SSTR or a prefix of
476 LSTR (at least MINLEN characters). If so, then if VALPTR is non-null
477 (the argument is supposed to have a value) store in *VALPTR either
478 the next argument or the portion of this one after the equal sign.
479 ARGV is read starting at position *SKIPPTR; this index is advanced
480 by the number of arguments used.
482 Too bad we can't just use getopt for all of this, but we don't have
483 enough information to do it right. */
486 argmatch (argv
, argc
, sstr
, lstr
, minlen
, valptr
, skipptr
)
499 /* Don't access argv[argc]; give up in advance. */
500 if (argc
<= *skipptr
+ 1)
503 arg
= argv
[*skipptr
+1];
506 if (strcmp (arg
, sstr
) == 0)
510 *valptr
= argv
[*skipptr
+2];
517 arglen
= (valptr
!= NULL
&& (p
= index (arg
, '=')) != NULL
518 ? p
- arg
: strlen (arg
));
519 if (lstr
== 0 || arglen
< minlen
|| strncmp (arg
, lstr
, arglen
) != 0)
521 else if (valptr
== NULL
)
532 else if (argv
[*skipptr
+2] != NULL
)
534 *valptr
= argv
[*skipptr
+2];
546 main (argc
, argv
, envp
)
551 char stack_bottom_variable
;
555 #ifdef HAVE_SETRLIMIT
559 #ifdef LINUX_SBRK_BUG
563 #ifdef DOUG_LEA_MALLOC
566 extern void r_alloc_reinit ();
567 malloc_set_state (malloc_state_ptr
);
568 free (malloc_state_ptr
);
573 #ifdef RUN_TIME_REMAP
575 run_time_remap (argv
[0]);
578 sort_args (argc
, argv
);
580 if (argmatch (argv
, argc
, "-version", "--version", 3, NULL
, &skip_args
))
583 tem
= Fsymbol_value (intern ("emacs-version"));
586 fprintf (stderr
, "Invalid value of `emacs-version'\n");
591 printf ("GNU Emacs %s\n", XSTRING (tem
)->data
);
592 printf ("Copyright (C) 1997 Free Software Foundation, Inc.\n");
593 printf ("GNU Emacs comes with ABSOLUTELY NO WARRANTY.\n");
594 printf ("You may redistribute copies of Emacs\n");
595 printf ("under the terms of the GNU General Public License.\n");
596 printf ("For more information about these matters, ");
597 printf ("see the files named COPYING.\n");
602 /* Map in shared memory, if we are using that. */
604 if (argmatch (argv
, argc
, "-nl", "--no-shared-memory", 6, NULL
, &skip_args
))
607 /* The shared memory was just restored, which clobbered this. */
613 /* The shared memory was just restored, which clobbered this. */
620 extern int malloc_cookie
;
621 /* This helps out unexnext.c. */
623 if (malloc_jumpstart (malloc_cookie
) != 0)
624 printf ("malloc jumpstart failed!\n");
629 /* If -map specified, map the data file in */
632 if (argmatch (argv
, argc
, "-map", "--map-data", 3, &mapin_file
, &skip_args
))
636 #ifdef LINK_CRTL_SHARE
637 #ifdef SHARABLE_LIB_BUG
638 /* Bletcherous shared libraries! */
640 stdin
= fdopen (0, "r");
642 stdout
= fdopen (1, "w");
644 stderr
= fdopen (2, "w");
647 #endif /* SHARABLE_LIB_BUG */
648 #endif /* LINK_CRTL_SHARE */
651 #if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
652 /* Extend the stack space available.
653 Don't do that if dumping, since some systems (e.g. DJGPP)
654 might define a smaller stack limit at that time. */
657 && (!noninteractive
|| initialized
)
659 && !getrlimit (RLIMIT_STACK
, &rlim
))
662 extern int re_max_failures
;
663 /* Approximate the amount regex.c needs per unit of re_max_failures. */
664 int ratio
= 20 * sizeof (char *);
665 /* Then add 33% to cover the size of the smaller stacks that regex.c
666 successively allocates and discards, on its way to the maximum. */
668 /* Add in some extra to cover
669 what we're likely to use for other reasons. */
670 newlim
= re_max_failures
* ratio
+ 200000;
672 /* NetBSD (at least NetBSD 1.2G and former) has a bug in its
673 stack allocation routine for new process that the allocation
674 fails if stack limit is not on page boundary. So, round up the
675 new limit to page boundary. */
676 newlim
= (newlim
+ getpagesize () - 1) / getpagesize () * getpagesize();
678 if (newlim
> rlim
.rlim_max
)
680 newlim
= rlim
.rlim_max
;
681 /* Don't let regex.c overflow the stack we have. */
682 re_max_failures
= (newlim
- 200000) / ratio
;
684 if (rlim
.rlim_cur
< newlim
)
685 rlim
.rlim_cur
= newlim
;
687 setrlimit (RLIMIT_STACK
, &rlim
);
689 #endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
691 /* Record (approximately) where the stack begins. */
692 stack_bottom
= &stack_bottom_variable
;
694 #ifdef USG_SHARED_LIBRARIES
696 brk ((void *)bss_end
);
701 #ifndef SYSTEM_MALLOC
704 /* Arrange to get warning messages as memory fills up. */
705 memory_warnings (0, malloc_warning
);
707 /* Arrange to disable interrupt input while malloc and friends are
709 uninterrupt_malloc ();
711 #endif /* not SYSTEM_MALLOC */
714 /* We do all file input/output as binary files. When we need to translate
715 newlines, we do that manually. */
719 if (!isatty (fileno (stdin
)))
720 setmode (fileno (stdin
), O_BINARY
);
721 if (!isatty (fileno (stdout
)))
724 setmode (fileno (stdout
), O_BINARY
);
726 #else /* not __DJGPP__ >= 2 */
727 (stdin
)->_flag
&= ~_IOTEXT
;
728 (stdout
)->_flag
&= ~_IOTEXT
;
729 (stderr
)->_flag
&= ~_IOTEXT
;
730 #endif /* not __DJGPP__ >= 2 */
733 #ifdef SET_EMACS_PRIORITY
735 nice (emacs_priority
);
737 #endif /* SET_EMACS_PRIORITY */
739 #ifdef EXTRA_INITIALIZE
743 inhibit_window_system
= 0;
745 /* Handle the -t switch, which specifies filename to use as terminal */
748 if (argmatch (argv
, argc
, "-t", "--terminal", 4, &term
, &skip_args
))
753 result
= open (term
, O_RDWR
, 2 );
756 char *errstring
= strerror (errno
);
757 fprintf (stderr
, "emacs: %s: %s\n", term
, errstring
);
763 fprintf (stderr
, "emacs: %s: not a tty\n", term
);
766 fprintf (stderr
, "Using %s\n", term
);
767 #ifdef HAVE_WINDOW_SYSTEM
768 inhibit_window_system
= 1; /* -t => -nw */
772 if (argmatch (argv
, argc
, "-nw", "--no-windows", 6, NULL
, &skip_args
))
773 inhibit_window_system
= 1;
775 /* Handle the -batch switch, which means don't do interactive display. */
777 if (argmatch (argv
, argc
, "-batch", "--batch", 5, NULL
, &skip_args
))
780 /* Handle the --help option, which gives a usage message.. */
781 if (argmatch (argv
, argc
, "-help", "--help", 3, NULL
, &skip_args
))
784 Usage: %s [-t term] [--terminal term] [-nw] [--no-windows] [--batch]\n\
785 [-q] [--no-init-file] [-u user] [--user user] [--debug-init]\n\
786 [--version] [--no-site-file]\n\
787 [-f func] [--funcall func] [-l file] [--load file] [--insert file]\n\
788 [+linenum] file-to-visit [--kill]\n\
789 Report bugs to bug-gnu-emacs@prep.ai.mit.edu. First, please see\n\
790 the Bugs section of the Emacs manual or the file BUGS.\n", argv
[0]);
794 #ifdef HAVE_X_WINDOWS
795 /* Stupid kludge to catch command-line display spec. We can't
796 handle this argument entirely in window system dependent code
797 because we don't even know which window system dependent code
798 to run until we've recognized this argument. */
800 char *displayname
= 0;
802 int count_before
= skip_args
;
804 if (argmatch (argv
, argc
, "-d", "--display", 3, &displayname
, &skip_args
))
806 else if (argmatch (argv
, argc
, "-display", 0, 3, &displayname
, &skip_args
))
809 /* If we have the form --display=NAME,
810 convert it into -d name.
811 This requires inserting a new element into argv. */
812 if (displayname
!= 0 && skip_args
- count_before
== 1)
814 char **new = (char **) xmalloc (sizeof (char *) * (argc
+ 2));
817 for (j
= 0; j
< count_before
+ 1; j
++)
819 new[count_before
+ 1] = "-d";
820 new[count_before
+ 2] = displayname
;
821 for (j
= count_before
+ 2; j
<argc
; j
++)
822 new[j
+ 1] = argv
[j
];
826 /* Change --display to -d, when its arg is separate. */
827 else if (displayname
!= 0 && skip_args
> count_before
828 && argv
[count_before
+ 1][1] == '-')
829 argv
[count_before
+ 1] = "-d";
831 /* Don't actually discard this arg. */
832 skip_args
= count_before
;
836 if (! noninteractive
)
841 inherited_pgroup
= EMACS_GETPGRP (0);
842 setpgrp (0, getpid ());
845 #if defined (USG5) && defined (INTERRUPT_INPUT)
855 /* Don't catch SIGHUP if dumping. */
862 sigblock (sigmask (SIGHUP
));
863 /* In --batch mode, don't catch SIGHUP if already ignored.
864 That makes nohup work. */
866 || signal (SIGHUP
, SIG_IGN
) != SIG_IGN
)
867 signal (SIGHUP
, fatal_error_signal
);
868 sigunblock (sigmask (SIGHUP
));
873 ! noninteractive
|| initialized
879 /* Don't catch these signals in batch mode if dumping.
880 On some machines, this sets static data that would make
881 signal fail to work right when the dumped Emacs is run. */
882 signal (SIGQUIT
, fatal_error_signal
);
883 signal (SIGILL
, fatal_error_signal
);
884 signal (SIGTRAP
, fatal_error_signal
);
886 signal (SIGUSR1
, handle_USR1_signal
);
888 signal (SIGUSR2
, handle_USR2_signal
);
892 signal (SIGABRT
, fatal_error_signal
);
895 signal (SIGHWE
, fatal_error_signal
);
898 signal (SIGPRE
, fatal_error_signal
);
901 signal (SIGORE
, fatal_error_signal
);
904 signal (SIGUME
, fatal_error_signal
);
907 signal (SIGDLK
, fatal_error_signal
);
910 signal (SIGCPULIM
, fatal_error_signal
);
913 /* This is missing on some systems - OS/2, for example. */
914 signal (SIGIOT
, fatal_error_signal
);
917 signal (SIGEMT
, fatal_error_signal
);
919 signal (SIGFPE
, fatal_error_signal
);
921 signal (SIGBUS
, fatal_error_signal
);
923 signal (SIGSEGV
, fatal_error_signal
);
925 signal (SIGSYS
, fatal_error_signal
);
927 signal (SIGTERM
, fatal_error_signal
);
929 signal (SIGXCPU
, fatal_error_signal
);
932 signal (SIGXFSZ
, fatal_error_signal
);
936 /* This just means available memory is getting low. */
937 signal (SIGDANGER
, memory_warning_signal
);
941 /* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
942 signal (SIGXCPU
, fatal_error_signal
);
944 signal (SIGIOINT
, fatal_error_signal
);
946 signal (SIGGRANT
, fatal_error_signal
);
947 signal (SIGRETRACT
, fatal_error_signal
);
948 signal (SIGSOUND
, fatal_error_signal
);
949 signal (SIGMSG
, fatal_error_signal
);
953 noninteractive1
= noninteractive
;
955 /* Perform basic initializations (not merely interning symbols) */
962 init_charset_once ();
964 init_syntax_once (); /* Create standard syntax table. */
965 init_category_once (); /* Create standard category table. */
966 /* Must be done before init_buffer */
967 init_casetab_once ();
968 init_buffer_once (); /* Create buffer table and some buffers */
969 init_minibuf_once (); /* Create list of minibuffers */
970 /* Must precede init_window_once */
971 init_window_once (); /* Init the window system */
977 running_asynch_code
= 0;
979 /* Handle --unibyte and the EMACS_UNIBYTE envvar,
980 but not while dumping. */
983 ! noninteractive
|| initialized
989 int inhibit_unibyte
= 0;
991 /* --multibyte overrides EMACS_UNIBYTE. */
992 if (argmatch (argv
, argc
, "-no-unibyte", "--no-unibyte", 4, NULL
, &skip_args
)
993 || argmatch (argv
, argc
, "-multibyte", "--multibyte", 4, NULL
, &skip_args
))
996 /* --unibyte requests that we set up to do everything with single-byte
997 buffers and strings. We need to handle this before calling
998 init_lread, init_editfns and other places that generate Lisp strings
999 from text in the environment. */
1000 if (argmatch (argv
, argc
, "-unibyte", "--unibyte", 4, NULL
, &skip_args
)
1001 || argmatch (argv
, argc
, "-no-multibyte", "--no-multibyte", 4, NULL
, &skip_args
)
1002 || (getenv ("EMACS_UNIBYTE") && !inhibit_unibyte
))
1004 Lisp_Object old_log_max
;
1005 Lisp_Object symbol
, tail
;
1007 symbol
= intern ("default-enable-multibyte-characters");
1008 Fset (symbol
, Qnil
);
1010 /* Erase pre-dump messages in *Messages* now so no abort. */
1011 old_log_max
= Vmessage_log_max
;
1012 XSETFASTINT (Vmessage_log_max
, 0);
1013 message_dolog ("", 0, 1, 0);
1014 Vmessage_log_max
= old_log_max
;
1016 for (tail
= Fbuffer_list (); CONSP (tail
);
1017 tail
= XCONS (tail
)->cdr
)
1021 buffer
= XCONS (tail
)->car
;
1022 /* Verify that all buffers are empty now, as they
1024 if (BUF_Z (XBUFFER (buffer
)) > BUF_BEG (XBUFFER (buffer
)))
1026 /* It is safe to do this crudely in an empty buffer. */
1027 XBUFFER (buffer
)->enable_multibyte_characters
= Qnil
;
1033 /* Call early 'cause init_environment needs it. */
1035 /* Set defaults for several environment variables. */
1037 init_environment (argc
, argv
, skip_args
);
1043 /* Initialize environment from registry settings. */
1044 init_environment ();
1045 init_ntproc (); /* must precede init_editfns */
1048 /* egetenv is a pretty low-level facility, which may get called in
1049 many circumstances; it seems flimsy to put off initializing it
1050 until calling init_callproc. */
1051 set_process_environment ();
1052 /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
1053 if this is not done. Do it after set_process_environment so that we
1054 don't pollute Vprocess_environment. */
1059 init_buffer (); /* Init default directory of main buffer */
1061 init_callproc_1 (); /* Must precede init_cmdargs and init_sys_modes. */
1062 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
1066 /* Erase any pre-dump messages in the message log, to avoid confusion */
1067 Lisp_Object old_log_max
;
1068 old_log_max
= Vmessage_log_max
;
1069 XSETFASTINT (Vmessage_log_max
, 0);
1070 message_dolog ("", 0, 1, 0);
1071 Vmessage_log_max
= old_log_max
;
1074 init_callproc (); /* Must follow init_cmdargs but not init_sys_modes. */
1077 if (!noninteractive
)
1080 init_vms_input ();/* init_display calls get_frame_size, that needs this */
1082 init_display (); /* Determine terminal type. init_sys_modes uses results */
1084 init_keyboard (); /* This too must precede init_sys_modes */
1086 init_vmsproc (); /* And this too. */
1088 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
1092 #ifdef LISP_FLOAT_TYPE
1100 /* Intern the names of all standard functions and variables; define standard keys */
1104 /* The basic levels of Lisp must come first */
1105 /* And data must come first of all
1106 for the sake of symbols like error-message */
1113 syms_of_floatfns ();
1117 syms_of_bytecode ();
1119 syms_of_casefiddle ();
1121 syms_of_callproc ();
1122 syms_of_category ();
1126 #ifndef NO_DIR_LIBRARY
1128 #endif /* not NO_DIR_LIBRARY */
1134 syms_of_coding (); /* This should be after syms_of_fileio. */
1135 #ifdef CLASH_DETECTION
1136 syms_of_filelock ();
1137 #endif /* CLASH_DETECTION */
1140 syms_of_keyboard ();
1145 syms_of_mocklisp ();
1153 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
1154 syms_of_textprop ();
1160 #endif /* WINDOWSNT */
1163 #ifdef HAVE_X_WINDOWS
1170 #endif /* HAVE_X_WINDOWS */
1180 syms_of_w32faces ();
1181 syms_of_w32select ();
1183 #endif /* HAVE_NTGUI */
1193 keys_of_casefiddle ();
1196 keys_of_keyboard ();
1207 /* Handle -l loadup-and-dump, args passed by Makefile. */
1208 if (argmatch (argv
, argc
, "-l", "--load", 3, &file
, &skip_args
))
1209 Vtop_level
= Fcons (intern ("load"),
1210 Fcons (build_string (file
), Qnil
));
1212 /* Unless next switch is -nl, load "loadup.el" first thing. */
1213 if (!argmatch (argv
, argc
, "-nl", "--no-loadup", 6, NULL
, &skip_args
))
1214 Vtop_level
= Fcons (intern ("load"),
1215 Fcons (build_string ("loadup.el"), Qnil
));
1216 #endif /* CANNOT_DUMP */
1223 /* If the execution TZ happens to be the same as the dump TZ,
1224 change it to some other value and then change it back,
1225 to force the underlying implementation to reload the TZ info.
1226 This is needed on implementations that load TZ info from files,
1227 since the TZ file contents may differ between dump and execution. */
1228 char *tz
= getenv ("TZ");
1229 if (tz
&& !strcmp (tz
, dump_tz
))
1239 /* Gerd Moellmann <gerd@acm.org> says this makes profiling work on
1240 FreeBSD. It might work on some other systems too.
1241 Give it a try and tell me if it works on your system. */
1246 extern void _mcleanup ();
1248 extern Lisp_Object
Fredraw_frame ();
1250 /* This uses Fredraw_frame because that function
1251 comes first in the Emacs executable.
1252 It might be better to use something that gives
1253 the start of the text segment, but start_of_text
1254 is not defined on all systems now. */
1255 monstartup (Fredraw_frame
, &etext
);
1264 #ifdef LOCALTIME_CACHE
1265 /* Some versions of localtime have a bug. They cache the value of the time
1266 zone rather than looking it up every time. Since localtime() is
1267 called to bolt the undumping time into the undumped emacs, this
1268 results in localtime ignoring the TZ environment variable.
1269 This flushes the new TZ value into localtime. */
1271 #endif /* defined (LOCALTIME_CACHE) */
1273 /* Enter editor command loop. This never returns. */
1278 /* Sort the args so we can find the most important ones
1279 at the beginning of argv. */
1281 /* First, here's a table of all the standard options. */
1283 struct standard_args
1291 struct standard_args standard_args
[] =
1293 { "-version", "--version", 110, 0 },
1294 { "-help", "--help", 110, 0 },
1295 { "-nl", "--no-shared-memory", 100, 0 },
1297 { "-map", "--map-data", 100, 0 },
1299 { "-t", "--terminal", 90, 1 },
1300 { "-d", "--display", 80, 1 },
1301 { "-display", 0, 80, 1 },
1302 { "-no-unibyte", "--no-unibyte", 76, 0 },
1303 { "-multibyte", "--multibyte", 76, 0 },
1304 { "-unibyte", "--unibyte", 75, 0 },
1305 { "-no-multibyte", "--no-multibyte", 75, 0 },
1306 { "-nw", "--no-windows", 70, 0 },
1307 { "-batch", "--batch", 60, 0 },
1308 { "-q", "--no-init-file", 50, 0 },
1309 { "-no-init-file", 0, 50, 0 },
1310 { "-no-site-file", "--no-site-file", 40, 0 },
1311 { "-u", "--user", 30, 1 },
1312 { "-user", 0, 30, 1 },
1313 { "-debug-init", "--debug-init", 20, 0 },
1314 { "-i", "--icon-type", 15, 0 },
1315 { "-itype", 0, 15, 0 },
1316 { "-iconic", "--iconic", 15, 0 },
1317 { "-bg", "--background-color", 10, 1 },
1318 { "-background", 0, 10, 1 },
1319 { "-fg", "--foreground-color", 10, 1 },
1320 { "-foreground", 0, 10, 1 },
1321 { "-bd", "--border-color", 10, 1 },
1322 { "-bw", "--border-width", 10, 1 },
1323 { "-ib", "--internal-border", 10, 1 },
1324 { "-ms", "--mouse-color", 10, 1 },
1325 { "-cr", "--cursor-color", 10, 1 },
1326 { "-fn", "--font", 10, 1 },
1327 { "-font", 0, 10, 1 },
1328 { "-g", "--geometry", 10, 1 },
1329 { "-geometry", 0, 10, 1 },
1330 { "-T", "--title", 10, 1 },
1331 { "-title", 0, 10, 1 },
1332 { "-name", "--name", 10, 1 },
1333 { "-xrm", "--xrm", 10, 1 },
1334 { "-r", "--reverse-video", 5, 0 },
1336 { "-reverse", 0, 5, 0 },
1337 { "-hb", "--horizontal-scroll-bars", 5, 0 },
1338 { "-vb", "--vertical-scroll-bars", 5, 0 },
1339 /* These have the same priority as ordinary file name args,
1340 so they are not reordered with respect to those. */
1341 { "-L", "--directory", 0, 1 },
1342 { "-directory", 0, 0, 1 },
1343 { "-l", "--load", 0, 1 },
1344 { "-load", 0, 0, 1 },
1345 { "-f", "--funcall", 0, 1 },
1346 { "-funcall", 0, 0, 1 },
1347 { "-eval", "--eval", 0, 1 },
1348 { "-find-file", "--find-file", 0, 1 },
1349 { "-visit", "--visit", 0, 1 },
1350 { "-insert", "--insert", 0, 1 },
1351 /* This should be processed after ordinary file name args and the like. */
1352 { "-kill", "--kill", -10, 0 },
1355 /* Reorder the elements of ARGV (assumed to have ARGC elements)
1356 so that the highest priority ones come first.
1357 Do not change the order of elements of equal priority.
1358 If an option takes an argument, keep it and its argument together. */
1361 sort_args (argc
, argv
)
1365 char **new = (char **) xmalloc (sizeof (char *) * argc
);
1366 /* For each element of argv,
1367 the corresponding element of options is:
1368 0 for an option that takes no arguments,
1369 1 for an option that takes one argument, etc.
1370 -1 for an ordinary non-option argument. */
1371 int *options
= (int *) xmalloc (sizeof (int) * argc
);
1372 int *priority
= (int *) xmalloc (sizeof (int) * argc
);
1376 int end_of_options
= argc
;
1378 /* Categorize all the options,
1379 and figure out which argv elts are option arguments. */
1380 for (from
= 1; from
< argc
; from
++)
1384 if (argv
[from
][0] == '-')
1389 /* If we have found "--", don't consider
1390 any more arguments as options. */
1391 if (argv
[from
][1] == '-' && argv
[from
][2] == 0)
1393 /* Leave the "--", and everything following it, at the end. */
1394 for (; from
< argc
; from
++)
1396 priority
[from
] = -100;
1402 /* Look for a match with a known old-fashioned option. */
1403 for (i
= 0; i
< sizeof (standard_args
) / sizeof (standard_args
[0]); i
++)
1404 if (!strcmp (argv
[from
], standard_args
[i
].name
))
1406 options
[from
] = standard_args
[i
].nargs
;
1407 priority
[from
] = standard_args
[i
].priority
;
1408 if (from
+ standard_args
[i
].nargs
>= argc
)
1409 fatal ("Option `%s' requires an argument\n", argv
[from
]);
1410 from
+= standard_args
[i
].nargs
;
1414 /* Look for a match with a known long option.
1415 MATCH is -1 if no match so far, -2 if two or more matches so far,
1416 >= 0 (the table index of the match) if just one match so far. */
1417 if (argv
[from
][1] == '-')
1420 thislen
= strlen (argv
[from
]);
1421 equals
= index (argv
[from
], '=');
1423 thislen
= equals
- argv
[from
];
1426 i
< sizeof (standard_args
) / sizeof (standard_args
[0]); i
++)
1427 if (standard_args
[i
].longname
1428 && !strncmp (argv
[from
], standard_args
[i
].longname
,
1437 /* If we found exactly one match, use that. */
1440 options
[from
] = standard_args
[match
].nargs
;
1441 priority
[from
] = standard_args
[match
].priority
;
1442 /* If --OPTION=VALUE syntax is used,
1443 this option uses just one argv element. */
1446 if (from
+ options
[from
] >= argc
)
1447 fatal ("Option `%s' requires an argument\n", argv
[from
]);
1448 from
+= options
[from
];
1455 /* Copy the arguments, in order of decreasing priority, to NEW. */
1460 int best_priority
= -9999;
1462 /* Find the highest priority remaining option.
1463 If several have equal priority, take the first of them. */
1464 for (from
= 1; from
< argc
; from
++)
1466 if (argv
[from
] != 0 && priority
[from
] > best_priority
)
1468 best_priority
= priority
[from
];
1471 /* Skip option arguments--they are tied to the options. */
1472 if (options
[from
] > 0)
1473 from
+= options
[from
];
1479 /* Copy the highest priority remaining option, with its args, to NEW. */
1480 new[to
++] = argv
[best
];
1481 for (i
= 0; i
< options
[best
]; i
++)
1482 new[to
++] = argv
[best
+ i
+ 1];
1484 /* Clear out this option in ARGV. */
1486 for (i
= 0; i
< options
[best
]; i
++)
1487 argv
[best
+ i
+ 1] = 0;
1490 bcopy (new, argv
, sizeof (char *) * argc
);
1497 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
1498 "Exit the Emacs job and kill it.\n\
1499 If ARG is an integer, return ARG as the exit program code.\n\
1500 If ARG is a string, stuff it as keyboard input.\n\n\
1501 The value of `kill-emacs-hook', if not void,\n\
1502 is a list of functions (of no args),\n\
1503 all of which are called before Emacs is actually killed.")
1507 Lisp_Object hook
, hook1
;
1509 struct gcpro gcpro1
;
1516 if (!NILP (Vrun_hooks
) && !noninteractive
)
1517 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
1521 /* Is it really necessary to do this deassign
1522 when we are going to exit anyway? */
1527 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
1529 /* If we have an auto-save list file,
1530 kill it because we are exiting Emacs deliberately (not crashing).
1531 Do it after shut_down_emacs, which does an auto-save. */
1532 if (STRINGP (Vauto_save_list_file_name
))
1533 unlink (XSTRING (Vauto_save_list_file_name
)->data
);
1535 exit (INTEGERP (arg
) ? XINT (arg
)
1546 /* Perform an orderly shutdown of Emacs. Autosave any modified
1547 buffers, kill any child processes, clean up the terminal modes (if
1548 we're in the foreground), and other stuff like that. Don't perform
1549 any redisplay; this may be called when Emacs is shutting down in
1550 the background, or after its X connection has died.
1552 If SIG is a signal number, print a message for it.
1554 This is called by fatal signal handlers, X protocol error handlers,
1558 shut_down_emacs (sig
, no_x
, stuff
)
1562 /* Prevent running of hooks from now on. */
1565 /* If we are controlling the terminal, reset terminal modes */
1566 #ifdef EMACS_HAVE_TTY_PGRP
1568 int pgrp
= EMACS_GETPGRP (0);
1571 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
1576 if (sig
&& sig
!= SIGTERM
)
1577 fprintf (stderr
, "Fatal error (%d).", sig
);
1585 stuff_buffered_input (stuff
);
1587 kill_buffer_processes (Qnil
);
1588 Fdo_auto_save (Qt
, Qnil
);
1590 #ifdef CLASH_DETECTION
1591 unlock_all_files ();
1595 kill_vms_processes ();
1598 #if 0 /* This triggers a bug in XCloseDisplay and is not needed. */
1599 #ifdef HAVE_X_WINDOWS
1600 /* It's not safe to call intern here. Maybe we are crashing. */
1601 if (!noninteractive
&& SYMBOLP (Vwindow_system
)
1602 && XSYMBOL (Vwindow_system
)->name
->size
== 1
1603 && XSYMBOL (Vwindow_system
)->name
->data
[0] == 'x'
1605 Fx_close_current_connection ();
1606 #endif /* HAVE_X_WINDOWS */
1610 /* There is a tendency for a SIGIO signal to arrive within exit,
1611 and cause a SIGHUP because the input descriptor is already closed. */
1613 signal (SIGIO
, SIG_IGN
);
1631 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
1632 "Dump current state of Emacs into data file FILENAME.\n\
1633 This function exists on systems that use HAVE_SHM.")
1635 Lisp_Object filename
;
1637 extern char my_edata
[];
1640 CHECK_STRING (filename
, 0);
1641 filename
= Fexpand_file_name (filename
, Qnil
);
1644 Vpurify_flag
= Qnil
;
1647 /* Tell malloc where start of impure now is */
1648 /* Also arrange for warnings when nearly out of space. */
1649 #ifndef SYSTEM_MALLOC
1650 memory_warnings (my_edata
, malloc_warning
);
1652 map_out_data (XSTRING (filename
)->data
);
1659 #else /* not HAVE_SHM */
1661 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
1662 "Dump current state of Emacs into executable file FILENAME.\n\
1663 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
1664 This is used in the file `loadup.el' when building Emacs.\n\
1666 You must run Emacs in batch mode in order to dump it.")
1668 Lisp_Object filename
, symfile
;
1670 extern char my_edata
[];
1673 int count
= specpdl_ptr
- specpdl
;
1675 if (! noninteractive
)
1676 error ("Dumping Emacs works only in batch mode");
1678 /* Bind `command-line-processed' to nil before dumping,
1679 so that the dumped Emacs will process its command line
1680 and set up to work with X windows if appropriate. */
1681 symbol
= intern ("command-line-process");
1682 specbind (symbol
, Qnil
);
1684 CHECK_STRING (filename
, 0);
1685 filename
= Fexpand_file_name (filename
, Qnil
);
1686 if (!NILP (symfile
))
1688 CHECK_STRING (symfile
, 0);
1689 if (XSTRING (symfile
)->size
)
1690 symfile
= Fexpand_file_name (symfile
, Qnil
);
1694 Vpurify_flag
= Qnil
;
1697 set_time_zone_rule (dump_tz
);
1698 #ifndef LOCALTIME_CACHE
1699 /* Force a tz reload, since set_time_zone_rule doesn't. */
1706 mapout_data (XSTRING (filename
)->data
);
1708 /* Tell malloc where start of impure now is */
1709 /* Also arrange for warnings when nearly out of space. */
1710 #ifndef SYSTEM_MALLOC
1712 /* On Windows, this was done before dumping, and that once suffices.
1713 Meanwhile, my_edata is not valid on Windows. */
1714 memory_warnings (my_edata
, malloc_warning
);
1715 #endif /* not WINDOWSNT */
1717 #ifdef DOUG_LEA_MALLOC
1718 malloc_state_ptr
= malloc_get_state ();
1720 unexec (XSTRING (filename
)->data
,
1721 !NILP (symfile
) ? XSTRING (symfile
)->data
: 0, my_edata
, 0, 0);
1722 #ifdef DOUG_LEA_MALLOC
1723 free (malloc_state_ptr
);
1725 #endif /* not VMS */
1729 return unbind_to (count
, Qnil
);
1732 #endif /* not HAVE_SHM */
1734 #endif /* not CANNOT_DUMP */
1741 decode_env_path (evarname
, defalt
)
1742 char *evarname
, *defalt
;
1744 register char *path
, *p
;
1745 Lisp_Object lpath
, element
, tem
;
1747 /* It's okay to use getenv here, because this function is only used
1748 to initialize variables when Emacs starts up, and isn't called
1751 path
= (char *) getenv (evarname
);
1757 /* Ensure values from the environment use the proper directory separator. */
1760 p
= alloca (strlen (path
) + 1);
1764 if ('/' == DIRECTORY_SEP
)
1765 dostounix_filename (path
);
1767 unixtodos_filename (path
);
1773 p
= index (path
, SEPCHAR
);
1774 if (!p
) p
= path
+ strlen (path
);
1775 element
= (p
- path
? make_string (path
, p
- path
)
1776 : build_string ("."));
1778 /* Add /: to the front of the name
1779 if it would otherwise be treated as magic. */
1780 tem
= Ffind_file_name_handler (element
, Qt
);
1782 element
= concat2 (build_string ("/:"), element
);
1784 lpath
= Fcons (element
, lpath
);
1790 return Fnreverse (lpath
);
1796 Qfile_name_handler_alist
= intern ("file-name-handler-alist");
1797 staticpro (&Qfile_name_handler_alist
);
1801 defsubr (&Sdump_emacs_data
);
1803 defsubr (&Sdump_emacs
);
1807 defsubr (&Skill_emacs
);
1809 defsubr (&Sinvocation_name
);
1810 defsubr (&Sinvocation_directory
);
1812 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
1813 "Args passed by shell to Emacs, as a list of strings.");
1815 DEFVAR_LISP ("system-type", &Vsystem_type
,
1816 "Value is symbol indicating type of operating system you are using.");
1817 Vsystem_type
= intern (SYSTEM_TYPE
);
1819 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
1820 "Value is string indicating configuration Emacs was built for.");
1821 Vsystem_configuration
= build_string (EMACS_CONFIGURATION
);
1823 DEFVAR_LISP ("system-configuration-options", &Vsystem_configuration_options
,
1824 "String containing the configuration options Emacs was built with.");
1825 Vsystem_configuration_options
= build_string (EMACS_CONFIG_OPTIONS
);
1827 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
1828 "Non-nil means Emacs is running without interactive terminal.");
1830 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
1831 "Hook to be run whenever kill-emacs is called.\n\
1832 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1833 in other similar situations), functions placed on this hook should not\n\
1834 expect to be able to interact with the user. To ask for confirmation,\n\
1835 see `kill-emacs-query-functions' instead.");
1836 Vkill_emacs_hook
= Qnil
;
1839 DEFVAR_LISP ("signal-USR1-hook", &Vsignal_USR1_hook
,
1840 "Hook to be run whenever emacs recieves a USR1 signal");
1841 Vsignal_USR1_hook
= Qnil
;
1843 DEFVAR_LISP ("signal-USR2-hook", &Vsignal_USR2_hook
,
1844 "Hook to be run whenever emacs recieves a USR2 signal");
1845 Vsignal_USR2_hook
= Qnil
;
1850 DEFVAR_INT ("emacs-priority", &emacs_priority
,
1851 "Priority for Emacs to run at.\n\
1852 This value is effective only if set before Emacs is dumped,\n\
1853 and only if the Emacs executable is installed with setuid to permit\n\
1854 it to change priority. (Emacs sets its uid back to the real uid.)\n\
1855 Currently, you need to define SET_EMACS_PRIORITY in `config.h'\n\
1856 before you compile Emacs, to enable the code for this feature.");
1859 DEFVAR_LISP ("path-separator", &Vpath_separator
,
1860 "The directory separator in search paths, as a string.");
1863 Vpath_separator
= make_string (&c
, 1);
1866 DEFVAR_LISP ("invocation-name", &Vinvocation_name
,
1867 "The program name that was used to run Emacs.\n\
1868 Any directory names are omitted.");
1870 DEFVAR_LISP ("invocation-directory", &Vinvocation_directory
,
1871 "The directory in which the Emacs executable was found, to run it.\n\
1872 The value is nil if that directory's name is not known.");
1874 DEFVAR_LISP ("installation-directory", &Vinstallation_directory
,
1875 "A directory within which to look for the `lib-src' and `etc' directories.\n\
1876 This is non-nil when we can't find those directories in their standard\n\
1877 installed locations, but we can find them\n\
1878 near where the Emacs executable was found.");
1879 Vinstallation_directory
= Qnil
;