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 */
270 #if ! defined (DOS_NT) && ! defined (NO_ABORT)
274 kill (getpid (), SIGABRT
);
275 /* This shouldn't be executed, but it prevents a warning. */
281 /* Code for dealing with Lisp access to the Unix command line */
284 init_cmdargs (argc
, argv
, skip_args
)
290 Lisp_Object name
, dir
, tem
;
291 int count
= specpdl_ptr
- specpdl
;
292 Lisp_Object raw_name
;
297 raw_name
= build_string (argv
[0]);
299 /* Add /: to the front of the name
300 if it would otherwise be treated as magic. */
301 tem
= Ffind_file_name_handler (raw_name
, Qt
);
303 raw_name
= concat2 (build_string ("/:"), raw_name
);
305 Vinvocation_name
= Ffile_name_nondirectory (raw_name
);
306 Vinvocation_directory
= Ffile_name_directory (raw_name
);
308 /* If we got no directory in argv[0], search PATH to find where
309 Emacs actually came from. */
310 if (NILP (Vinvocation_directory
))
313 int yes
= openp (Vexec_path
, Vinvocation_name
,
314 EXEC_SUFFIXES
, &found
, 1);
317 /* Add /: to the front of the name
318 if it would otherwise be treated as magic. */
319 tem
= Ffind_file_name_handler (found
, Qt
);
321 found
= concat2 (build_string ("/:"), found
);
322 Vinvocation_directory
= Ffile_name_directory (found
);
326 if (!NILP (Vinvocation_directory
)
327 && NILP (Ffile_name_absolute_p (Vinvocation_directory
)))
328 /* Emacs was started with relative path, like ./emacs.
330 Vinvocation_directory
= Fexpand_file_name (Vinvocation_directory
, Qnil
);
332 Vinstallation_directory
= Qnil
;
334 if (!NILP (Vinvocation_directory
))
336 dir
= Vinvocation_directory
;
337 name
= Fexpand_file_name (Vinvocation_name
, dir
);
340 Lisp_Object tem
, lib_src_exists
;
341 Lisp_Object etc_exists
, info_exists
;
343 /* See if dir contains subdirs for use by Emacs.
344 Check for the ones that would exist in a build directory,
345 not including lisp and info. */
346 tem
= Fexpand_file_name (build_string ("lib-src"), dir
);
347 lib_src_exists
= Ffile_exists_p (tem
);
350 /* MSDOS installations frequently remove lib-src, but we still
351 must set installation-directory, or else info won't find
352 its files (it uses the value of installation-directory). */
353 tem
= Fexpand_file_name (build_string ("info"), dir
);
354 info_exists
= Ffile_exists_p (tem
);
359 if (!NILP (lib_src_exists
) || !NILP (info_exists
))
361 tem
= Fexpand_file_name (build_string ("etc"), dir
);
362 etc_exists
= Ffile_exists_p (tem
);
363 if (!NILP (etc_exists
))
365 Vinstallation_directory
366 = Ffile_name_as_directory (dir
);
371 /* See if dir's parent contains those subdirs. */
372 tem
= Fexpand_file_name (build_string ("../lib-src"), dir
);
373 lib_src_exists
= Ffile_exists_p (tem
);
377 /* See the MSDOS commentary above. */
378 tem
= Fexpand_file_name (build_string ("../info"), dir
);
379 info_exists
= Ffile_exists_p (tem
);
384 if (!NILP (lib_src_exists
) || !NILP (info_exists
))
386 tem
= Fexpand_file_name (build_string ("../etc"), dir
);
387 etc_exists
= Ffile_exists_p (tem
);
388 if (!NILP (etc_exists
))
390 tem
= Fexpand_file_name (build_string (".."), dir
);
391 Vinstallation_directory
392 = Ffile_name_as_directory (tem
);
397 /* If the Emacs executable is actually a link,
398 next try the dir that the link points into. */
399 tem
= Ffile_symlink_p (name
);
402 name
= Fexpand_file_name (tem
, dir
);
403 dir
= Ffile_name_directory (name
);
410 Vcommand_line_args
= Qnil
;
412 for (i
= argc
- 1; i
>= 0; i
--)
414 if (i
== 0 || i
> skip_args
)
416 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
419 unbind_to (count
, Qnil
);
422 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
423 "Return the program name that was used to run Emacs.\n\
424 Any directory names are omitted.")
427 return Fcopy_sequence (Vinvocation_name
);
430 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
432 "Return the directory name in which the Emacs executable was located")
435 return Fcopy_sequence (Vinvocation_directory
);
440 #ifdef LINK_CRTL_SHARE
441 #ifdef SHARABLE_LIB_BUG
442 extern noshare
char **environ
;
443 #endif /* SHARABLE_LIB_BUG */
444 #endif /* LINK_CRTL_SHARE */
448 /* A valid but unlikely value for the TZ environment value.
449 It is OK (though a bit slower) if the user actually chooses this value. */
450 static char dump_tz
[] = "UtC0";
453 #ifndef ORDINARY_LINK
454 /* We don't include crtbegin.o and crtend.o in the link,
455 so these functions and variables might be missed.
456 Provide dummy definitions to avoid error.
457 (We don't have any real constructors or destructors.) */
459 #ifndef GCC_CTORS_IN_LIBC
460 void __do_global_ctors ()
462 void __do_global_ctors_aux ()
464 void __do_global_dtors ()
466 /* Linux has a bug in its library; avoid an error. */
468 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
470 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
471 #endif /* GCC_CTORS_IN_LIBC */
474 #endif /* __GNUC__ */
475 #endif /* ORDINARY_LINK */
477 /* Test whether the next argument in ARGV matches SSTR or a prefix of
478 LSTR (at least MINLEN characters). If so, then if VALPTR is non-null
479 (the argument is supposed to have a value) store in *VALPTR either
480 the next argument or the portion of this one after the equal sign.
481 ARGV is read starting at position *SKIPPTR; this index is advanced
482 by the number of arguments used.
484 Too bad we can't just use getopt for all of this, but we don't have
485 enough information to do it right. */
488 argmatch (argv
, argc
, sstr
, lstr
, minlen
, valptr
, skipptr
)
501 /* Don't access argv[argc]; give up in advance. */
502 if (argc
<= *skipptr
+ 1)
505 arg
= argv
[*skipptr
+1];
508 if (strcmp (arg
, sstr
) == 0)
512 *valptr
= argv
[*skipptr
+2];
519 arglen
= (valptr
!= NULL
&& (p
= index (arg
, '=')) != NULL
520 ? p
- arg
: strlen (arg
));
521 if (lstr
== 0 || arglen
< minlen
|| strncmp (arg
, lstr
, arglen
) != 0)
523 else if (valptr
== NULL
)
534 else if (argv
[*skipptr
+2] != NULL
)
536 *valptr
= argv
[*skipptr
+2];
548 main (argc
, argv
, envp
)
553 char stack_bottom_variable
;
557 #ifdef HAVE_SETRLIMIT
561 #ifdef LINUX_SBRK_BUG
565 #ifdef DOUG_LEA_MALLOC
568 extern void r_alloc_reinit ();
569 malloc_set_state (malloc_state_ptr
);
570 free (malloc_state_ptr
);
575 #ifdef RUN_TIME_REMAP
577 run_time_remap (argv
[0]);
580 sort_args (argc
, argv
);
582 if (argmatch (argv
, argc
, "-version", "--version", 3, NULL
, &skip_args
))
585 tem
= Fsymbol_value (intern ("emacs-version"));
588 fprintf (stderr
, "Invalid value of `emacs-version'\n");
593 printf ("GNU Emacs %s\n", XSTRING (tem
)->data
);
594 printf ("Copyright (C) 1997 Free Software Foundation, Inc.\n");
595 printf ("GNU Emacs comes with ABSOLUTELY NO WARRANTY.\n");
596 printf ("You may redistribute copies of Emacs\n");
597 printf ("under the terms of the GNU General Public License.\n");
598 printf ("For more information about these matters, ");
599 printf ("see the files named COPYING.\n");
604 /* Map in shared memory, if we are using that. */
606 if (argmatch (argv
, argc
, "-nl", "--no-shared-memory", 6, NULL
, &skip_args
))
609 /* The shared memory was just restored, which clobbered this. */
615 /* The shared memory was just restored, which clobbered this. */
622 extern int malloc_cookie
;
623 /* This helps out unexnext.c. */
625 if (malloc_jumpstart (malloc_cookie
) != 0)
626 printf ("malloc jumpstart failed!\n");
631 /* If -map specified, map the data file in */
634 if (argmatch (argv
, argc
, "-map", "--map-data", 3, &mapin_file
, &skip_args
))
638 #ifdef LINK_CRTL_SHARE
639 #ifdef SHARABLE_LIB_BUG
640 /* Bletcherous shared libraries! */
642 stdin
= fdopen (0, "r");
644 stdout
= fdopen (1, "w");
646 stderr
= fdopen (2, "w");
649 #endif /* SHARABLE_LIB_BUG */
650 #endif /* LINK_CRTL_SHARE */
653 #if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
654 /* Extend the stack space available.
655 Don't do that if dumping, since some systems (e.g. DJGPP)
656 might define a smaller stack limit at that time. */
659 && (!noninteractive
|| initialized
)
661 && !getrlimit (RLIMIT_STACK
, &rlim
))
664 extern int re_max_failures
;
665 /* Approximate the amount regex.c needs per unit of re_max_failures. */
666 int ratio
= 20 * sizeof (char *);
667 /* Then add 33% to cover the size of the smaller stacks that regex.c
668 successively allocates and discards, on its way to the maximum. */
670 /* Add in some extra to cover
671 what we're likely to use for other reasons. */
672 newlim
= re_max_failures
* ratio
+ 200000;
674 /* NetBSD (at least NetBSD 1.2G and former) has a bug in its
675 stack allocation routine for new process that the allocation
676 fails if stack limit is not on page boundary. So, round up the
677 new limit to page boundary. */
678 newlim
= (newlim
+ getpagesize () - 1) / getpagesize () * getpagesize();
680 if (newlim
> rlim
.rlim_max
)
682 newlim
= rlim
.rlim_max
;
683 /* Don't let regex.c overflow the stack we have. */
684 re_max_failures
= (newlim
- 200000) / ratio
;
686 if (rlim
.rlim_cur
< newlim
)
687 rlim
.rlim_cur
= newlim
;
689 setrlimit (RLIMIT_STACK
, &rlim
);
691 #endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
693 /* Record (approximately) where the stack begins. */
694 stack_bottom
= &stack_bottom_variable
;
696 #ifdef USG_SHARED_LIBRARIES
698 brk ((void *)bss_end
);
703 #ifndef SYSTEM_MALLOC
706 /* Arrange to get warning messages as memory fills up. */
707 memory_warnings (0, malloc_warning
);
709 /* Arrange to disable interrupt input while malloc and friends are
711 uninterrupt_malloc ();
713 #endif /* not SYSTEM_MALLOC */
716 /* We do all file input/output as binary files. When we need to translate
717 newlines, we do that manually. */
721 if (!isatty (fileno (stdin
)))
722 setmode (fileno (stdin
), O_BINARY
);
723 if (!isatty (fileno (stdout
)))
726 setmode (fileno (stdout
), O_BINARY
);
728 #else /* not __DJGPP__ >= 2 */
729 (stdin
)->_flag
&= ~_IOTEXT
;
730 (stdout
)->_flag
&= ~_IOTEXT
;
731 (stderr
)->_flag
&= ~_IOTEXT
;
732 #endif /* not __DJGPP__ >= 2 */
735 #ifdef SET_EMACS_PRIORITY
737 nice (emacs_priority
);
739 #endif /* SET_EMACS_PRIORITY */
741 #ifdef EXTRA_INITIALIZE
745 inhibit_window_system
= 0;
747 /* Handle the -t switch, which specifies filename to use as terminal */
750 if (argmatch (argv
, argc
, "-t", "--terminal", 4, &term
, &skip_args
))
755 result
= open (term
, O_RDWR
, 2 );
758 char *errstring
= strerror (errno
);
759 fprintf (stderr
, "emacs: %s: %s\n", term
, errstring
);
765 fprintf (stderr
, "emacs: %s: not a tty\n", term
);
768 fprintf (stderr
, "Using %s\n", term
);
769 #ifdef HAVE_WINDOW_SYSTEM
770 inhibit_window_system
= 1; /* -t => -nw */
774 if (argmatch (argv
, argc
, "-nw", "--no-windows", 6, NULL
, &skip_args
))
775 inhibit_window_system
= 1;
777 /* Handle the -batch switch, which means don't do interactive display. */
779 if (argmatch (argv
, argc
, "-batch", "--batch", 5, NULL
, &skip_args
))
782 /* Handle the --help option, which gives a usage message.. */
783 if (argmatch (argv
, argc
, "-help", "--help", 3, NULL
, &skip_args
))
786 Usage: %s [-t term] [--terminal term] [-nw] [--no-windows] [--batch]\n\
787 [-q] [--no-init-file] [-u user] [--user user] [--debug-init]\n\
788 [--unibyte] [--multibyte] [--version] [--no-site-file]\n\
789 [-f func] [--funcall func] [-l file] [--load file] [--insert file]\n\
790 [+linenum] file-to-visit [--kill]\n\
791 Report bugs to bug-gnu-emacs@gnu.org. First, please see\n\
792 the Bugs section of the Emacs manual or the file BUGS.\n", argv
[0]);
796 #ifdef HAVE_X_WINDOWS
797 /* Stupid kludge to catch command-line display spec. We can't
798 handle this argument entirely in window system dependent code
799 because we don't even know which window system dependent code
800 to run until we've recognized this argument. */
802 char *displayname
= 0;
804 int count_before
= skip_args
;
806 if (argmatch (argv
, argc
, "-d", "--display", 3, &displayname
, &skip_args
))
808 else if (argmatch (argv
, argc
, "-display", 0, 3, &displayname
, &skip_args
))
811 /* If we have the form --display=NAME,
812 convert it into -d name.
813 This requires inserting a new element into argv. */
814 if (displayname
!= 0 && skip_args
- count_before
== 1)
816 char **new = (char **) xmalloc (sizeof (char *) * (argc
+ 2));
819 for (j
= 0; j
< count_before
+ 1; j
++)
821 new[count_before
+ 1] = "-d";
822 new[count_before
+ 2] = displayname
;
823 for (j
= count_before
+ 2; j
<argc
; j
++)
824 new[j
+ 1] = argv
[j
];
828 /* Change --display to -d, when its arg is separate. */
829 else if (displayname
!= 0 && skip_args
> count_before
830 && argv
[count_before
+ 1][1] == '-')
831 argv
[count_before
+ 1] = "-d";
833 /* Don't actually discard this arg. */
834 skip_args
= count_before
;
838 if (! noninteractive
)
843 inherited_pgroup
= EMACS_GETPGRP (0);
844 setpgrp (0, getpid ());
847 #if defined (USG5) && defined (INTERRUPT_INPUT)
857 /* Don't catch SIGHUP if dumping. */
864 sigblock (sigmask (SIGHUP
));
865 /* In --batch mode, don't catch SIGHUP if already ignored.
866 That makes nohup work. */
868 || signal (SIGHUP
, SIG_IGN
) != SIG_IGN
)
869 signal (SIGHUP
, fatal_error_signal
);
870 sigunblock (sigmask (SIGHUP
));
875 ! noninteractive
|| initialized
881 /* Don't catch these signals in batch mode if dumping.
882 On some machines, this sets static data that would make
883 signal fail to work right when the dumped Emacs is run. */
884 signal (SIGQUIT
, fatal_error_signal
);
885 signal (SIGILL
, fatal_error_signal
);
886 signal (SIGTRAP
, fatal_error_signal
);
888 signal (SIGUSR1
, handle_USR1_signal
);
890 signal (SIGUSR2
, handle_USR2_signal
);
894 signal (SIGABRT
, fatal_error_signal
);
897 signal (SIGHWE
, fatal_error_signal
);
900 signal (SIGPRE
, fatal_error_signal
);
903 signal (SIGORE
, fatal_error_signal
);
906 signal (SIGUME
, fatal_error_signal
);
909 signal (SIGDLK
, fatal_error_signal
);
912 signal (SIGCPULIM
, fatal_error_signal
);
915 /* This is missing on some systems - OS/2, for example. */
916 signal (SIGIOT
, fatal_error_signal
);
919 signal (SIGEMT
, fatal_error_signal
);
921 signal (SIGFPE
, fatal_error_signal
);
923 signal (SIGBUS
, fatal_error_signal
);
925 signal (SIGSEGV
, fatal_error_signal
);
927 signal (SIGSYS
, fatal_error_signal
);
929 signal (SIGTERM
, fatal_error_signal
);
931 signal (SIGXCPU
, fatal_error_signal
);
934 signal (SIGXFSZ
, fatal_error_signal
);
938 /* This just means available memory is getting low. */
939 signal (SIGDANGER
, memory_warning_signal
);
943 /* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
944 signal (SIGXCPU
, fatal_error_signal
);
946 signal (SIGIOINT
, fatal_error_signal
);
948 signal (SIGGRANT
, fatal_error_signal
);
949 signal (SIGRETRACT
, fatal_error_signal
);
950 signal (SIGSOUND
, fatal_error_signal
);
951 signal (SIGMSG
, fatal_error_signal
);
955 noninteractive1
= noninteractive
;
957 /* Perform basic initializations (not merely interning symbols) */
964 init_charset_once ();
966 init_syntax_once (); /* Create standard syntax table. */
967 init_category_once (); /* Create standard category table. */
968 /* Must be done before init_buffer */
969 init_casetab_once ();
970 init_buffer_once (); /* Create buffer table and some buffers */
971 init_minibuf_once (); /* Create list of minibuffers */
972 /* Must precede init_window_once */
973 init_window_once (); /* Init the window system */
979 running_asynch_code
= 0;
981 /* Handle --unibyte and the EMACS_UNIBYTE envvar,
982 but not while dumping. */
985 ! noninteractive
|| initialized
991 int inhibit_unibyte
= 0;
993 /* --multibyte overrides EMACS_UNIBYTE. */
994 if (argmatch (argv
, argc
, "-no-unibyte", "--no-unibyte", 4, NULL
, &skip_args
)
995 || argmatch (argv
, argc
, "-multibyte", "--multibyte", 4, NULL
, &skip_args
))
998 /* --unibyte requests that we set up to do everything with single-byte
999 buffers and strings. We need to handle this before calling
1000 init_lread, init_editfns and other places that generate Lisp strings
1001 from text in the environment. */
1002 if (argmatch (argv
, argc
, "-unibyte", "--unibyte", 4, NULL
, &skip_args
)
1003 || argmatch (argv
, argc
, "-no-multibyte", "--no-multibyte", 4, NULL
, &skip_args
)
1004 || (getenv ("EMACS_UNIBYTE") && !inhibit_unibyte
))
1006 Lisp_Object old_log_max
;
1007 Lisp_Object symbol
, tail
;
1009 symbol
= intern ("default-enable-multibyte-characters");
1010 Fset (symbol
, Qnil
);
1012 /* Erase pre-dump messages in *Messages* now so no abort. */
1013 old_log_max
= Vmessage_log_max
;
1014 XSETFASTINT (Vmessage_log_max
, 0);
1015 message_dolog ("", 0, 1, 0);
1016 Vmessage_log_max
= old_log_max
;
1018 for (tail
= Vbuffer_alist
; CONSP (tail
);
1019 tail
= XCONS (tail
)->cdr
)
1023 buffer
= Fcdr (XCONS (tail
)->car
);
1024 /* Verify that all buffers are empty now, as they
1026 if (BUF_Z (XBUFFER (buffer
)) > BUF_BEG (XBUFFER (buffer
)))
1028 /* It is safe to do this crudely in an empty buffer. */
1029 XBUFFER (buffer
)->enable_multibyte_characters
= Qnil
;
1035 /* Call early 'cause init_environment needs it. */
1037 /* Set defaults for several environment variables. */
1039 init_environment (argc
, argv
, skip_args
);
1045 /* Initialize environment from registry settings. */
1046 init_environment ();
1047 init_ntproc (); /* must precede init_editfns */
1050 /* egetenv is a pretty low-level facility, which may get called in
1051 many circumstances; it seems flimsy to put off initializing it
1052 until calling init_callproc. */
1053 set_process_environment ();
1054 /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
1055 if this is not done. Do it after set_process_environment so that we
1056 don't pollute Vprocess_environment. */
1061 init_buffer (); /* Init default directory of main buffer */
1063 init_callproc_1 (); /* Must precede init_cmdargs and init_sys_modes. */
1064 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
1068 /* Erase any pre-dump messages in the message log, to avoid confusion */
1069 Lisp_Object old_log_max
;
1070 old_log_max
= Vmessage_log_max
;
1071 XSETFASTINT (Vmessage_log_max
, 0);
1072 message_dolog ("", 0, 1, 0);
1073 Vmessage_log_max
= old_log_max
;
1076 init_callproc (); /* Must follow init_cmdargs but not init_sys_modes. */
1079 if (!noninteractive
)
1082 init_vms_input ();/* init_display calls get_frame_size, that needs this */
1084 init_display (); /* Determine terminal type. init_sys_modes uses results */
1086 init_keyboard (); /* This too must precede init_sys_modes */
1088 init_vmsproc (); /* And this too. */
1090 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
1094 #ifdef LISP_FLOAT_TYPE
1102 /* Intern the names of all standard functions and variables; define standard keys */
1106 /* The basic levels of Lisp must come first */
1107 /* And data must come first of all
1108 for the sake of symbols like error-message */
1115 syms_of_floatfns ();
1119 syms_of_bytecode ();
1121 syms_of_casefiddle ();
1123 syms_of_callproc ();
1124 syms_of_category ();
1128 #ifndef NO_DIR_LIBRARY
1130 #endif /* not NO_DIR_LIBRARY */
1136 syms_of_coding (); /* This should be after syms_of_fileio. */
1137 #ifdef CLASH_DETECTION
1138 syms_of_filelock ();
1139 #endif /* CLASH_DETECTION */
1142 syms_of_keyboard ();
1147 syms_of_mocklisp ();
1155 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
1156 syms_of_textprop ();
1162 #endif /* WINDOWSNT */
1165 #ifdef HAVE_X_WINDOWS
1172 #endif /* HAVE_X_WINDOWS */
1182 syms_of_w32faces ();
1183 syms_of_w32select ();
1185 #endif /* HAVE_NTGUI */
1195 keys_of_casefiddle ();
1198 keys_of_keyboard ();
1209 /* Handle -l loadup-and-dump, args passed by Makefile. */
1210 if (argmatch (argv
, argc
, "-l", "--load", 3, &file
, &skip_args
))
1211 Vtop_level
= Fcons (intern ("load"),
1212 Fcons (build_string (file
), Qnil
));
1214 /* Unless next switch is -nl, load "loadup.el" first thing. */
1215 if (!argmatch (argv
, argc
, "-nl", "--no-loadup", 6, NULL
, &skip_args
))
1216 Vtop_level
= Fcons (intern ("load"),
1217 Fcons (build_string ("loadup.el"), Qnil
));
1218 #endif /* CANNOT_DUMP */
1225 /* If the execution TZ happens to be the same as the dump TZ,
1226 change it to some other value and then change it back,
1227 to force the underlying implementation to reload the TZ info.
1228 This is needed on implementations that load TZ info from files,
1229 since the TZ file contents may differ between dump and execution. */
1230 char *tz
= getenv ("TZ");
1231 if (tz
&& !strcmp (tz
, dump_tz
))
1241 /* Gerd Moellmann <gerd@acm.org> says this makes profiling work on
1242 FreeBSD. It might work on some other systems too.
1243 Give it a try and tell me if it works on your system. */
1248 extern void _mcleanup ();
1250 extern Lisp_Object
Fredraw_frame ();
1252 /* This uses Fredraw_frame because that function
1253 comes first in the Emacs executable.
1254 It might be better to use something that gives
1255 the start of the text segment, but start_of_text
1256 is not defined on all systems now. */
1257 monstartup (Fredraw_frame
, &etext
);
1266 #ifdef LOCALTIME_CACHE
1267 /* Some versions of localtime have a bug. They cache the value of the time
1268 zone rather than looking it up every time. Since localtime() is
1269 called to bolt the undumping time into the undumped emacs, this
1270 results in localtime ignoring the TZ environment variable.
1271 This flushes the new TZ value into localtime. */
1273 #endif /* defined (LOCALTIME_CACHE) */
1275 /* Enter editor command loop. This never returns. */
1280 /* Sort the args so we can find the most important ones
1281 at the beginning of argv. */
1283 /* First, here's a table of all the standard options. */
1285 struct standard_args
1293 struct standard_args standard_args
[] =
1295 { "-version", "--version", 110, 0 },
1296 { "-help", "--help", 110, 0 },
1297 { "-nl", "--no-shared-memory", 100, 0 },
1299 { "-map", "--map-data", 100, 0 },
1301 { "-t", "--terminal", 90, 1 },
1302 { "-d", "--display", 80, 1 },
1303 { "-display", 0, 80, 1 },
1304 { "-nw", "--no-windows", 70, 0 },
1305 { "-no-unibyte", "--no-unibyte", 66, 0 },
1306 { "-multibyte", "--multibyte", 66, 0 },
1307 { "-unibyte", "--unibyte", 65, 0 },
1308 { "-no-multibyte", "--no-multibyte", 65, 0 },
1309 { "-batch", "--batch", 60, 0 },
1310 { "-q", "--no-init-file", 50, 0 },
1311 { "-no-init-file", 0, 50, 0 },
1312 { "-no-site-file", "--no-site-file", 40, 0 },
1313 { "-u", "--user", 30, 1 },
1314 { "-user", 0, 30, 1 },
1315 { "-debug-init", "--debug-init", 20, 0 },
1316 { "-i", "--icon-type", 15, 0 },
1317 { "-itype", 0, 15, 0 },
1318 { "-iconic", "--iconic", 15, 0 },
1319 { "-bg", "--background-color", 10, 1 },
1320 { "-background", 0, 10, 1 },
1321 { "-fg", "--foreground-color", 10, 1 },
1322 { "-foreground", 0, 10, 1 },
1323 { "-bd", "--border-color", 10, 1 },
1324 { "-bw", "--border-width", 10, 1 },
1325 { "-ib", "--internal-border", 10, 1 },
1326 { "-ms", "--mouse-color", 10, 1 },
1327 { "-cr", "--cursor-color", 10, 1 },
1328 { "-fn", "--font", 10, 1 },
1329 { "-font", 0, 10, 1 },
1330 { "-g", "--geometry", 10, 1 },
1331 { "-geometry", 0, 10, 1 },
1332 { "-T", "--title", 10, 1 },
1333 { "-title", 0, 10, 1 },
1334 { "-name", "--name", 10, 1 },
1335 { "-xrm", "--xrm", 10, 1 },
1336 { "-r", "--reverse-video", 5, 0 },
1338 { "-reverse", 0, 5, 0 },
1339 { "-hb", "--horizontal-scroll-bars", 5, 0 },
1340 { "-vb", "--vertical-scroll-bars", 5, 0 },
1341 /* These have the same priority as ordinary file name args,
1342 so they are not reordered with respect to those. */
1343 { "-L", "--directory", 0, 1 },
1344 { "-directory", 0, 0, 1 },
1345 { "-l", "--load", 0, 1 },
1346 { "-load", 0, 0, 1 },
1347 { "-f", "--funcall", 0, 1 },
1348 { "-funcall", 0, 0, 1 },
1349 { "-eval", "--eval", 0, 1 },
1350 { "-find-file", "--find-file", 0, 1 },
1351 { "-visit", "--visit", 0, 1 },
1352 { "-insert", "--insert", 0, 1 },
1353 /* This should be processed after ordinary file name args and the like. */
1354 { "-kill", "--kill", -10, 0 },
1357 /* Reorder the elements of ARGV (assumed to have ARGC elements)
1358 so that the highest priority ones come first.
1359 Do not change the order of elements of equal priority.
1360 If an option takes an argument, keep it and its argument together. */
1363 sort_args (argc
, argv
)
1367 char **new = (char **) xmalloc (sizeof (char *) * argc
);
1368 /* For each element of argv,
1369 the corresponding element of options is:
1370 0 for an option that takes no arguments,
1371 1 for an option that takes one argument, etc.
1372 -1 for an ordinary non-option argument. */
1373 int *options
= (int *) xmalloc (sizeof (int) * argc
);
1374 int *priority
= (int *) xmalloc (sizeof (int) * argc
);
1378 int end_of_options
= argc
;
1380 /* Categorize all the options,
1381 and figure out which argv elts are option arguments. */
1382 for (from
= 1; from
< argc
; from
++)
1386 if (argv
[from
][0] == '-')
1391 /* If we have found "--", don't consider
1392 any more arguments as options. */
1393 if (argv
[from
][1] == '-' && argv
[from
][2] == 0)
1395 /* Leave the "--", and everything following it, at the end. */
1396 for (; from
< argc
; from
++)
1398 priority
[from
] = -100;
1404 /* Look for a match with a known old-fashioned option. */
1405 for (i
= 0; i
< sizeof (standard_args
) / sizeof (standard_args
[0]); i
++)
1406 if (!strcmp (argv
[from
], standard_args
[i
].name
))
1408 options
[from
] = standard_args
[i
].nargs
;
1409 priority
[from
] = standard_args
[i
].priority
;
1410 if (from
+ standard_args
[i
].nargs
>= argc
)
1411 fatal ("Option `%s' requires an argument\n", argv
[from
]);
1412 from
+= standard_args
[i
].nargs
;
1416 /* Look for a match with a known long option.
1417 MATCH is -1 if no match so far, -2 if two or more matches so far,
1418 >= 0 (the table index of the match) if just one match so far. */
1419 if (argv
[from
][1] == '-')
1422 thislen
= strlen (argv
[from
]);
1423 equals
= index (argv
[from
], '=');
1425 thislen
= equals
- argv
[from
];
1428 i
< sizeof (standard_args
) / sizeof (standard_args
[0]); i
++)
1429 if (standard_args
[i
].longname
1430 && !strncmp (argv
[from
], standard_args
[i
].longname
,
1439 /* If we found exactly one match, use that. */
1442 options
[from
] = standard_args
[match
].nargs
;
1443 priority
[from
] = standard_args
[match
].priority
;
1444 /* If --OPTION=VALUE syntax is used,
1445 this option uses just one argv element. */
1448 if (from
+ options
[from
] >= argc
)
1449 fatal ("Option `%s' requires an argument\n", argv
[from
]);
1450 from
+= options
[from
];
1457 /* Copy the arguments, in order of decreasing priority, to NEW. */
1462 int best_priority
= -9999;
1464 /* Find the highest priority remaining option.
1465 If several have equal priority, take the first of them. */
1466 for (from
= 1; from
< argc
; from
++)
1468 if (argv
[from
] != 0 && priority
[from
] > best_priority
)
1470 best_priority
= priority
[from
];
1473 /* Skip option arguments--they are tied to the options. */
1474 if (options
[from
] > 0)
1475 from
+= options
[from
];
1481 /* Copy the highest priority remaining option, with its args, to NEW. */
1482 new[to
++] = argv
[best
];
1483 for (i
= 0; i
< options
[best
]; i
++)
1484 new[to
++] = argv
[best
+ i
+ 1];
1486 /* Clear out this option in ARGV. */
1488 for (i
= 0; i
< options
[best
]; i
++)
1489 argv
[best
+ i
+ 1] = 0;
1492 bcopy (new, argv
, sizeof (char *) * argc
);
1499 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
1500 "Exit the Emacs job and kill it.\n\
1501 If ARG is an integer, return ARG as the exit program code.\n\
1502 If ARG is a string, stuff it as keyboard input.\n\n\
1503 The value of `kill-emacs-hook', if not void,\n\
1504 is a list of functions (of no args),\n\
1505 all of which are called before Emacs is actually killed.")
1509 Lisp_Object hook
, hook1
;
1511 struct gcpro gcpro1
;
1518 if (!NILP (Vrun_hooks
) && !noninteractive
)
1519 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
1523 /* Is it really necessary to do this deassign
1524 when we are going to exit anyway? */
1529 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
1531 /* If we have an auto-save list file,
1532 kill it because we are exiting Emacs deliberately (not crashing).
1533 Do it after shut_down_emacs, which does an auto-save. */
1534 if (STRINGP (Vauto_save_list_file_name
))
1535 unlink (XSTRING (Vauto_save_list_file_name
)->data
);
1537 exit (INTEGERP (arg
) ? XINT (arg
)
1548 /* Perform an orderly shutdown of Emacs. Autosave any modified
1549 buffers, kill any child processes, clean up the terminal modes (if
1550 we're in the foreground), and other stuff like that. Don't perform
1551 any redisplay; this may be called when Emacs is shutting down in
1552 the background, or after its X connection has died.
1554 If SIG is a signal number, print a message for it.
1556 This is called by fatal signal handlers, X protocol error handlers,
1560 shut_down_emacs (sig
, no_x
, stuff
)
1564 /* Prevent running of hooks from now on. */
1567 /* If we are controlling the terminal, reset terminal modes */
1568 #ifdef EMACS_HAVE_TTY_PGRP
1570 int pgrp
= EMACS_GETPGRP (0);
1573 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
1578 if (sig
&& sig
!= SIGTERM
)
1579 fprintf (stderr
, "Fatal error (%d).", sig
);
1587 stuff_buffered_input (stuff
);
1589 kill_buffer_processes (Qnil
);
1590 Fdo_auto_save (Qt
, Qnil
);
1592 #ifdef CLASH_DETECTION
1593 unlock_all_files ();
1597 kill_vms_processes ();
1600 #if 0 /* This triggers a bug in XCloseDisplay and is not needed. */
1601 #ifdef HAVE_X_WINDOWS
1602 /* It's not safe to call intern here. Maybe we are crashing. */
1603 if (!noninteractive
&& SYMBOLP (Vwindow_system
)
1604 && XSYMBOL (Vwindow_system
)->name
->size
== 1
1605 && XSYMBOL (Vwindow_system
)->name
->data
[0] == 'x'
1607 Fx_close_current_connection ();
1608 #endif /* HAVE_X_WINDOWS */
1612 /* There is a tendency for a SIGIO signal to arrive within exit,
1613 and cause a SIGHUP because the input descriptor is already closed. */
1615 signal (SIGIO
, SIG_IGN
);
1633 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
1634 "Dump current state of Emacs into data file FILENAME.\n\
1635 This function exists on systems that use HAVE_SHM.")
1637 Lisp_Object filename
;
1639 extern char my_edata
[];
1642 CHECK_STRING (filename
, 0);
1643 filename
= Fexpand_file_name (filename
, Qnil
);
1646 Vpurify_flag
= Qnil
;
1649 /* Tell malloc where start of impure now is */
1650 /* Also arrange for warnings when nearly out of space. */
1651 #ifndef SYSTEM_MALLOC
1652 memory_warnings (my_edata
, malloc_warning
);
1654 map_out_data (XSTRING (filename
)->data
);
1661 #else /* not HAVE_SHM */
1663 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
1664 "Dump current state of Emacs into executable file FILENAME.\n\
1665 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
1666 This is used in the file `loadup.el' when building Emacs.\n\
1668 You must run Emacs in batch mode in order to dump it.")
1670 Lisp_Object filename
, symfile
;
1672 extern char my_edata
[];
1675 int count
= specpdl_ptr
- specpdl
;
1677 if (! noninteractive
)
1678 error ("Dumping Emacs works only in batch mode");
1680 /* Bind `command-line-processed' to nil before dumping,
1681 so that the dumped Emacs will process its command line
1682 and set up to work with X windows if appropriate. */
1683 symbol
= intern ("command-line-process");
1684 specbind (symbol
, Qnil
);
1686 CHECK_STRING (filename
, 0);
1687 filename
= Fexpand_file_name (filename
, Qnil
);
1688 if (!NILP (symfile
))
1690 CHECK_STRING (symfile
, 0);
1691 if (XSTRING (symfile
)->size
)
1692 symfile
= Fexpand_file_name (symfile
, Qnil
);
1696 Vpurify_flag
= Qnil
;
1699 set_time_zone_rule (dump_tz
);
1700 #ifndef LOCALTIME_CACHE
1701 /* Force a tz reload, since set_time_zone_rule doesn't. */
1708 mapout_data (XSTRING (filename
)->data
);
1710 /* Tell malloc where start of impure now is */
1711 /* Also arrange for warnings when nearly out of space. */
1712 #ifndef SYSTEM_MALLOC
1714 /* On Windows, this was done before dumping, and that once suffices.
1715 Meanwhile, my_edata is not valid on Windows. */
1716 memory_warnings (my_edata
, malloc_warning
);
1717 #endif /* not WINDOWSNT */
1719 #ifdef DOUG_LEA_MALLOC
1720 malloc_state_ptr
= malloc_get_state ();
1722 unexec (XSTRING (filename
)->data
,
1723 !NILP (symfile
) ? XSTRING (symfile
)->data
: 0, my_edata
, 0, 0);
1724 #ifdef DOUG_LEA_MALLOC
1725 free (malloc_state_ptr
);
1727 #endif /* not VMS */
1731 return unbind_to (count
, Qnil
);
1734 #endif /* not HAVE_SHM */
1736 #endif /* not CANNOT_DUMP */
1743 decode_env_path (evarname
, defalt
)
1744 char *evarname
, *defalt
;
1746 register char *path
, *p
;
1747 Lisp_Object lpath
, element
, tem
;
1749 /* It's okay to use getenv here, because this function is only used
1750 to initialize variables when Emacs starts up, and isn't called
1753 path
= (char *) getenv (evarname
);
1759 /* Ensure values from the environment use the proper directory separator. */
1762 p
= alloca (strlen (path
) + 1);
1766 if ('/' == DIRECTORY_SEP
)
1767 dostounix_filename (path
);
1769 unixtodos_filename (path
);
1775 p
= index (path
, SEPCHAR
);
1776 if (!p
) p
= path
+ strlen (path
);
1777 element
= (p
- path
? make_string (path
, p
- path
)
1778 : build_string ("."));
1780 /* Add /: to the front of the name
1781 if it would otherwise be treated as magic. */
1782 tem
= Ffind_file_name_handler (element
, Qt
);
1784 element
= concat2 (build_string ("/:"), element
);
1786 lpath
= Fcons (element
, lpath
);
1792 return Fnreverse (lpath
);
1798 Qfile_name_handler_alist
= intern ("file-name-handler-alist");
1799 staticpro (&Qfile_name_handler_alist
);
1803 defsubr (&Sdump_emacs_data
);
1805 defsubr (&Sdump_emacs
);
1809 defsubr (&Skill_emacs
);
1811 defsubr (&Sinvocation_name
);
1812 defsubr (&Sinvocation_directory
);
1814 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
1815 "Args passed by shell to Emacs, as a list of strings.");
1817 DEFVAR_LISP ("system-type", &Vsystem_type
,
1818 "Value is symbol indicating type of operating system you are using.");
1819 Vsystem_type
= intern (SYSTEM_TYPE
);
1821 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
1822 "Value is string indicating configuration Emacs was built for.");
1823 Vsystem_configuration
= build_string (EMACS_CONFIGURATION
);
1825 DEFVAR_LISP ("system-configuration-options", &Vsystem_configuration_options
,
1826 "String containing the configuration options Emacs was built with.");
1827 Vsystem_configuration_options
= build_string (EMACS_CONFIG_OPTIONS
);
1829 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
1830 "Non-nil means Emacs is running without interactive terminal.");
1832 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
1833 "Hook to be run whenever kill-emacs is called.\n\
1834 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1835 in other similar situations), functions placed on this hook should not\n\
1836 expect to be able to interact with the user. To ask for confirmation,\n\
1837 see `kill-emacs-query-functions' instead.");
1838 Vkill_emacs_hook
= Qnil
;
1841 DEFVAR_LISP ("signal-USR1-hook", &Vsignal_USR1_hook
,
1842 "Hook to be run whenever emacs receives a USR1 signal");
1843 Vsignal_USR1_hook
= Qnil
;
1845 DEFVAR_LISP ("signal-USR2-hook", &Vsignal_USR2_hook
,
1846 "Hook to be run whenever emacs receives a USR2 signal");
1847 Vsignal_USR2_hook
= Qnil
;
1852 DEFVAR_INT ("emacs-priority", &emacs_priority
,
1853 "Priority for Emacs to run at.\n\
1854 This value is effective only if set before Emacs is dumped,\n\
1855 and only if the Emacs executable is installed with setuid to permit\n\
1856 it to change priority. (Emacs sets its uid back to the real uid.)\n\
1857 Currently, you need to define SET_EMACS_PRIORITY in `config.h'\n\
1858 before you compile Emacs, to enable the code for this feature.");
1861 DEFVAR_LISP ("path-separator", &Vpath_separator
,
1862 "The directory separator in search paths, as a string.");
1865 Vpath_separator
= make_string (&c
, 1);
1868 DEFVAR_LISP ("invocation-name", &Vinvocation_name
,
1869 "The program name that was used to run Emacs.\n\
1870 Any directory names are omitted.");
1872 DEFVAR_LISP ("invocation-directory", &Vinvocation_directory
,
1873 "The directory in which the Emacs executable was found, to run it.\n\
1874 The value is nil if that directory's name is not known.");
1876 DEFVAR_LISP ("installation-directory", &Vinstallation_directory
,
1877 "A directory within which to look for the `lib-src' and `etc' directories.\n\
1878 This is non-nil when we can't find those directories in their standard\n\
1879 installed locations, but we can find them\n\
1880 near where the Emacs executable was found.");
1881 Vinstallation_directory
= Qnil
;