1 /* Fully extensible Emacs, running on Unix, intended for GNU.
2 Copyright (C) 1985, 1986, 1987, 1993, 1994 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include <sys/types.h>
35 #include <sys/ioctl.h>
40 #include <default_acl.h>
46 #include "intervals.h"
49 #include "syssignal.h"
56 extern void malloc_warning ();
57 extern char *index ();
58 extern char *strerror ();
60 /* Command line args from shell, as list of strings */
61 Lisp_Object Vcommand_line_args
;
63 /* The name under which Emacs was invoked, with any leading directory
65 Lisp_Object Vinvocation_name
;
67 /* The directory name from which Emacs was invoked. */
68 Lisp_Object Vinvocation_directory
;
70 /* The directory name in which to find subdirs such as lisp and etc.
71 nil means get them only from PATH_LOADSEARCH. */
72 Lisp_Object Vinstallation_directory
;
74 /* Hook run by `kill-emacs' before it does really anything. */
75 Lisp_Object Vkill_emacs_hook
;
77 /* Set nonzero after Emacs has started up the first time.
78 Prevents reinitialization of the Lisp world and keymaps
79 on subsequent starts. */
82 /* Variable whose value is symbol giving operating system type. */
83 Lisp_Object Vsystem_type
;
85 /* Variable whose value is string giving configuration built for. */
86 Lisp_Object Vsystem_configuration
;
88 /* If non-zero, emacs should not attempt to use an window-specific code,
89 but instead should use the virtual terminal under which it was started */
90 int inhibit_window_system
;
92 /* If nonzero, set Emacs to run at this priority. This is also used
93 in child_setup and sys_suspend to make sure subshells run at normal
94 priority; Those functions have their own extern declaration. */
99 extern int inherited_pgroup
;
102 #ifdef HAVE_X_WINDOWS
103 /* If non-zero, -d was specified, meaning we're using some window system. */
107 /* An address near the bottom of the stack.
108 Tells GC how to save a copy of the stack. */
111 #ifdef HAVE_X_WINDOWS
112 extern Lisp_Object Vwindow_system
;
113 #endif /* HAVE_X_WINDOWS */
115 #ifdef USG_SHARED_LIBRARIES
116 /* If nonzero, this is the place to put the end of the writable segment
119 unsigned int bss_end
= 0;
122 /* Nonzero means running Emacs without interactive terminal. */
126 /* Value of Lisp variable `noninteractive'.
127 Normally same as C variable `noninteractive'
128 but nothing terrible happens if user sets this one. */
132 /* Save argv and argc. */
136 /* Signal code for the fatal signal that was received */
137 int fatal_error_code
;
139 /* Nonzero if handling a fatal error already */
140 int fatal_error_in_progress
;
142 /* Handle bus errors, illegal instruction, etc. */
144 fatal_error_signal (sig
)
147 fatal_error_code
= sig
;
148 signal (sig
, SIG_DFL
);
150 /* If fatal error occurs in code below, avoid infinite recursion. */
151 if (! fatal_error_in_progress
)
153 fatal_error_in_progress
= 1;
155 shut_down_emacs (sig
, 0, Qnil
);
159 LIB$
STOP (SS$_ABORT
);
161 /* Signal the same code; this time it will really be fatal.
162 Remember that since we're in a signal handler, the signal we're
163 going to send is probably blocked, so we have to unblock it if we
164 want to really receive it. */
166 sigunblock (sigmask (fatal_error_code
));
168 kill (getpid (), fatal_error_code
);
174 /* Handler for SIGDANGER. */
176 memory_warning_signal (sig
)
179 signal (sig
, memory_warning_signal
);
181 malloc_warning ("Operating system warns that virtual memory is running low.\n");
183 /* It might be unsafe to call do_auto_save now. */
184 force_auto_save_soon ();
188 /* Code for dealing with Lisp access to the Unix command line */
191 init_cmdargs (argc
, argv
, skip_args
)
197 Lisp_Object name
, dir
;
202 Vinvocation_name
= Ffile_name_nondirectory (build_string (argv
[0]));
203 Vinvocation_directory
= Ffile_name_directory (build_string (argv
[0]));
204 /* If we got no directory in argv[0], search PATH to find where
205 Emacs actually came from. */
206 if (NILP (Vinvocation_directory
))
209 int yes
= openp (Vexec_path
, Vinvocation_name
,
210 EXEC_SUFFIXES
, &found
, 1);
212 Vinvocation_directory
= Ffile_name_directory (found
);
215 Vinstallation_directory
= Qnil
;
217 if (!NILP (Vinvocation_directory
))
219 dir
= Vinvocation_directory
;
220 name
= Fexpand_file_name (Vinvocation_name
, dir
);
223 Lisp_Object tem
, lib_src_exists
;
224 Lisp_Object etc_exists
, info_exists
;
226 /* See if dir contains subdirs for use by Emacs.
227 Check for the ones that would exist in a build directory,
228 not including lisp and info. */
229 tem
= Fexpand_file_name (build_string ("lib-src"), dir
);
230 lib_src_exists
= Ffile_exists_p (tem
);
231 if (!NILP (lib_src_exists
))
233 tem
= Fexpand_file_name (build_string ("etc"), dir
);
234 etc_exists
= Ffile_exists_p (tem
);
235 if (!NILP (etc_exists
))
237 Vinstallation_directory
238 = Ffile_name_as_directory (dir
);
243 /* See if dir's parent contains those subdirs. */
244 tem
= Fexpand_file_name (build_string ("../lib-src"), dir
);
245 lib_src_exists
= Ffile_exists_p (tem
);
246 if (!NILP (lib_src_exists
))
248 tem
= Fexpand_file_name (build_string ("../etc"), dir
);
249 etc_exists
= Ffile_exists_p (tem
);
250 if (!NILP (etc_exists
))
252 tem
= Fexpand_file_name (build_string (".."), dir
);
253 Vinstallation_directory
254 = Ffile_name_as_directory (tem
);
259 /* If the Emacs executable is actually a link,
260 next try the dir that the link points into. */
261 tem
= Ffile_symlink_p (name
);
265 dir
= Ffile_name_directory (name
);
272 Vcommand_line_args
= Qnil
;
274 for (i
= argc
- 1; i
>= 0; i
--)
276 if (i
== 0 || i
> skip_args
)
278 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
282 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
283 "Return the program name that was used to run Emacs.\n\
284 Any directory names are omitted.")
287 return Fcopy_sequence (Vinvocation_name
);
290 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
292 "Return the directory name in which the Emacs executable was located")
295 return Fcopy_sequence (Vinvocation_directory
);
300 #ifdef LINK_CRTL_SHARE
301 #ifdef SHAREABLE_LIB_BUG
302 extern noshare
char **environ
;
303 #endif /* SHAREABLE_LIB_BUG */
304 #endif /* LINK_CRTL_SHARE */
307 #ifndef ORDINARY_LINK
308 /* We don't include crtbegin.o and crtend.o in the link,
309 so these functions and variables might be missed.
310 Provide dummy definitions to avoid error.
311 (We don't have any real constructors or destructors.) */
313 #ifndef GCC_CTORS_IN_LIBC
316 __do_global_ctors_aux ()
320 /* Linux has a bug in its library; avoid an error. */
322 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
324 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
325 #endif /* GCC_CTORS_IN_LIBC */
328 #endif /* __GNUC__ */
329 #endif /* ORDINARY_LINK */
332 main (argc
, argv
, envp
)
337 char stack_bottom_variable
;
342 /* Map in shared memory, if we are using that. */
344 if (argc
> 1 && !strcmp (argv
[1], "-nl"))
347 /* The shared memory was just restored, which clobbered this. */
353 /* The shared memory was just restored, which clobbered this. */
359 extern int malloc_cookie
;
361 /* This helps out unexnext.c. */
363 if (malloc_jumpstart (malloc_cookie
) != 0)
364 printf ("malloc jumpstart failed!\n");
367 #ifdef HAVE_X_WINDOWS
368 /* Stupid kludge to catch command-line display spec. We can't
369 handle this argument entirely in window system dependent code
370 because we don't even know which window system dependent code
371 to run until we've recognized this argument. */
375 for (i
= 1; (i
< argc
&& ! display_arg
); i
++)
376 if (!strcmp (argv
[i
], "-d") || !strcmp (argv
[i
], "-display"))
382 /* If -map specified, map the data file in */
383 if (argc
> 2 && ! strcmp (argv
[1], "-map"))
386 mapin_data (argv
[2]);
389 #ifdef LINK_CRTL_SHARE
390 #ifdef SHAREABLE_LIB_BUG
391 /* Bletcherous shared libraries! */
393 stdin
= fdopen (0, "r");
395 stdout
= fdopen (1, "w");
397 stderr
= fdopen (2, "w");
400 #endif /* SHAREABLE_LIB_BUG */
401 #endif /* LINK_CRTL_SHARE */
404 /* Record (approximately) where the stack begins. */
405 stack_bottom
= &stack_bottom_variable
;
407 #ifdef RUN_TIME_REMAP
409 run_time_remap (argv
[0]);
412 #ifdef USG_SHARED_LIBRARIES
421 /* If USE_DOMAIN_ACLS environment variable exists,
422 use ACLs rather than UNIX modes. */
423 if (egetenv ("USE_DOMAIN_ACLS"))
424 default_acl (USE_DEFACL
);
428 #ifndef SYSTEM_MALLOC
431 /* Arrange to get warning messages as memory fills up. */
432 memory_warnings (0, malloc_warning
);
434 /* Arrange to disable interrupt input while malloc and friends are
436 uninterrupt_malloc ();
438 #endif /* not SYSTEM_MALLOC */
441 /* We do all file input/output as binary files. When we need to translate
442 newlines, we do that manually. */
444 (stdin
)->_flag
&= ~_IOTEXT
;
445 (stdout
)->_flag
&= ~_IOTEXT
;
446 (stderr
)->_flag
&= ~_IOTEXT
;
449 #ifdef SET_EMACS_PRIORITY
451 nice (emacs_priority
);
453 #endif /* SET_EMACS_PRIORITY */
455 #ifdef EXTRA_INITIALIZE
459 inhibit_window_system
= 0;
461 /* Handle the -t switch, which specifies filename to use as terminal */
462 if (skip_args
+ 2 < argc
&& !strcmp (argv
[skip_args
+ 1], "-t"))
468 result
= open (argv
[skip_args
], O_RDWR
, 2 );
471 char *errstring
= strerror (errno
);
472 fprintf (stderr
, "emacs: %s: %s\n", argv
[skip_args
], errstring
);
478 fprintf (stderr
, "emacs: %s: not a tty\n", argv
[skip_args
]);
481 fprintf (stderr
, "Using %s\n", argv
[skip_args
]);
482 #ifdef HAVE_X_WINDOWS
483 inhibit_window_system
= 1; /* -t => -nw */
487 if (skip_args
+ 1 < argc
488 && (!strcmp (argv
[skip_args
+ 1], "-nw")))
491 inhibit_window_system
= 1;
494 /* Handle the -batch switch, which means don't do interactive display. */
496 if (skip_args
+ 1 < argc
&& !strcmp (argv
[skip_args
+ 1], "-batch"))
502 if (! noninteractive
)
507 inherited_pgroup
= EMACS_GETPGRP (0);
508 setpgrp (0, getpid ());
511 #if defined (USG5) && defined (INTERRUPT_INPUT)
523 ! noninteractive
|| initialized
529 /* Don't catch these signals in batch mode if not initialized.
530 On some machines, this sets static data that would make
531 signal fail to work right when the dumped Emacs is run. */
532 signal (SIGHUP
, fatal_error_signal
);
533 signal (SIGQUIT
, fatal_error_signal
);
534 signal (SIGILL
, fatal_error_signal
);
535 signal (SIGTRAP
, fatal_error_signal
);
537 /* This is missing on some systems - OS/2, for example. */
538 signal (SIGIOT
, fatal_error_signal
);
541 signal (SIGEMT
, fatal_error_signal
);
543 signal (SIGFPE
, fatal_error_signal
);
545 signal (SIGBUS
, fatal_error_signal
);
547 signal (SIGSEGV
, fatal_error_signal
);
549 signal (SIGSYS
, fatal_error_signal
);
551 signal (SIGTERM
, fatal_error_signal
);
553 signal (SIGXCPU
, fatal_error_signal
);
556 signal (SIGXFSZ
, fatal_error_signal
);
560 /* This just means available memory is getting low. */
561 signal (SIGDANGER
, memory_warning_signal
);
565 /* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
566 signal (SIGXCPU
, fatal_error_signal
);
568 signal (SIGIOINT
, fatal_error_signal
);
570 signal (SIGGRANT
, fatal_error_signal
);
571 signal (SIGRETRACT
, fatal_error_signal
);
572 signal (SIGSOUND
, fatal_error_signal
);
573 signal (SIGMSG
, fatal_error_signal
);
577 noninteractive1
= noninteractive
;
579 /* Perform basic initializations (not merely interning symbols) */
586 init_syntax_once (); /* Create standard syntax table. */
587 /* Must be done before init_buffer */
588 init_casetab_once ();
589 init_buffer_once (); /* Create buffer table and some buffers */
590 init_minibuf_once (); /* Create list of minibuffers */
591 /* Must precede init_window_once */
592 init_window_once (); /* Init the window system */
600 /* Call early 'cause init_environment needs it. */
602 /* Set defaults for several environment variables. */
603 if (initialized
) init_environment (argc
, argv
, skip_args
);
606 /* egetenv is a pretty low-level facility, which may get called in
607 many circumstances; it seems flimsy to put off initializing it
608 until calling init_callproc. */
609 set_process_environment ();
610 /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
611 if this is not done. Do it after set_process_environment so that we
612 don't pollute Vprocess_environment. */
617 init_buffer (); /* Init default directory of main buffer */
619 init_callproc_1 (); /* Must precede init_cmdargs and init_sys_modes. */
620 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
621 init_callproc (); /* Must follow init_cmdargs but not init_sys_modes. */
627 init_vms_input ();/* init_display calls get_frame_size, that needs this */
629 init_display (); /* Determine terminal type. init_sys_modes uses results */
631 init_keyboard (); /* This too must precede init_sys_modes */
633 init_vmsproc (); /* And this too. */
635 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
639 #ifdef LISP_FLOAT_TYPE
646 #ifdef CLASH_DETECTION
648 #endif /* CLASH_DETECTION */
650 /* Intern the names of all standard functions and variables; define standard keys */
654 /* The basic levels of Lisp must come first */
655 /* And data must come first of all
656 for the sake of symbols like error-message */
669 syms_of_casefiddle ();
673 #ifndef NO_DIR_LIBRARY
675 #endif /* not NO_DIR_LIBRARY */
681 #ifdef CLASH_DETECTION
683 #endif /* CLASH_DETECTION */
698 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
705 #ifdef HAVE_X_WINDOWS
714 #endif /* HAVE_X_MENU */
715 #endif /* HAVE_X_WINDOWS */
725 keys_of_casefiddle ();
738 /* Handle -l loadup-and-dump, args passed by Makefile. */
739 if (argc
> 2 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-l"))
740 Vtop_level
= Fcons (intern ("load"),
741 Fcons (build_string (argv
[2 + skip_args
]), Qnil
));
743 /* Unless next switch is -nl, load "loadup.el" first thing. */
744 if (!(argc
> 1 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-nl")))
745 Vtop_level
= Fcons (intern ("load"),
746 Fcons (build_string ("loadup.el"), Qnil
));
747 #endif /* CANNOT_DUMP */
752 #if defined (sun) || defined (LOCALTIME_CACHE)
753 /* sun's localtime has a bug. it caches the value of the time
754 zone rather than looking it up every time. Since localtime() is
755 called to bolt the undumping time into the undumped emacs, this
756 results in localtime ignoring the TZ environment variable.
757 This flushes the new TZ value into localtime. */
759 #endif /* defined (sun) || defined (LOCALTIME_CACHE) */
761 /* Enter editor command loop. This never returns. */
766 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
767 "Exit the Emacs job and kill it.\n\
768 If ARG is an integer, return ARG as the exit program code.\n\
769 If ARG is a string, stuff it as keyboard input.\n\n\
770 The value of `kill-emacs-hook', if not void,\n\
771 is a list of functions (of no args),\n\
772 all of which are called before Emacs is actually killed.")
776 Lisp_Object hook
, hook1
;
785 if (!NILP (Vrun_hooks
) && !noninteractive
)
786 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
790 /* Is it really necessary to do this deassign
791 when we are going to exit anyway? */
796 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
798 exit ((XTYPE (arg
) == Lisp_Int
) ? XINT (arg
)
809 /* Perform an orderly shutdown of Emacs. Autosave any modified
810 buffers, kill any child processes, clean up the terminal modes (if
811 we're in the foreground), and other stuff like that. Don't perform
812 any redisplay; this may be called when Emacs is shutting down in
813 the background, or after its X connection has died.
815 If SIG is a signal number, print a message for it.
817 This is called by fatal signal handlers, X protocol error handlers,
821 shut_down_emacs (sig
, no_x
, stuff
)
825 /* Prevent running of hooks from now on. */
828 /* If we are controlling the terminal, reset terminal modes */
829 #ifdef EMACS_HAVE_TTY_PGRP
831 int pgrp
= EMACS_GETPGRP (0);
834 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
839 if (sig
&& sig
!= SIGTERM
)
840 fprintf (stderr
, "Fatal error (%d).", sig
);
848 stuff_buffered_input (stuff
);
850 kill_buffer_processes (Qnil
);
851 Fdo_auto_save (Qt
, Qnil
);
853 #ifdef CLASH_DETECTION
858 kill_vms_processes ();
861 #ifdef HAVE_X_WINDOWS
862 /* It's not safe to call intern here. Maybe we are crashing. */
863 if (!noninteractive
&& SYMBOLP (Vwindow_system
)
864 && XSYMBOL (Vwindow_system
)->name
->size
== 1
865 && XSYMBOL (Vwindow_system
)->name
->data
[0] == 'x'
867 Fx_close_current_connection ();
868 #endif /* HAVE_X_WINDOWS */
871 /* There is a tendency for a SIGIO signal to arrive within exit,
872 and cause a SIGHUP because the input descriptor is already closed. */
874 signal (SIGIO
, SIG_IGN
);
881 /* Nothing like this can be implemented on an Apollo.
886 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
887 "Dump current state of Emacs into data file FILENAME.\n\
888 This function exists on systems that use HAVE_SHM.")
890 Lisp_Object intoname
;
895 CHECK_STRING (intoname
, 0);
896 intoname
= Fexpand_file_name (intoname
, Qnil
);
902 /* Tell malloc where start of impure now is */
903 /* Also arrange for warnings when nearly out of space. */
904 #ifndef SYSTEM_MALLOC
905 memory_warnings (&my_edata
, malloc_warning
);
907 map_out_data (XSTRING (intoname
)->data
);
914 #else /* not HAVE_SHM */
916 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
917 "Dump current state of Emacs into executable file FILENAME.\n\
918 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
919 This is used in the file `loadup.el' when building Emacs.\n\
921 Bind `command-line-processed' to nil before dumping,\n\
922 if you want the dumped Emacs to process its command line\n\
923 and announce itself normally when it is run.")
925 Lisp_Object intoname
, symname
;
930 CHECK_STRING (intoname
, 0);
931 intoname
= Fexpand_file_name (intoname
, Qnil
);
934 CHECK_STRING (symname
, 0);
935 if (XSTRING (symname
)->size
)
936 symname
= Fexpand_file_name (symname
, Qnil
);
944 mapout_data (XSTRING (intoname
)->data
);
946 /* Tell malloc where start of impure now is */
947 /* Also arrange for warnings when nearly out of space. */
948 #ifndef SYSTEM_MALLOC
949 memory_warnings (&my_edata
, malloc_warning
);
951 unexec (XSTRING (intoname
)->data
,
952 !NILP (symname
) ? XSTRING (symname
)->data
: 0, &my_edata
, 0, 0);
960 #endif /* not HAVE_SHM */
962 #endif /* not CANNOT_DUMP */
969 decode_env_path (evarname
, defalt
)
970 char *evarname
, *defalt
;
972 register char *path
, *p
;
976 /* It's okay to use getenv here, because this function is only used
977 to initialize variables when Emacs starts up, and isn't called
980 path
= (char *) getenv (evarname
);
988 p
= index (path
, SEPCHAR
);
989 if (!p
) p
= path
+ strlen (path
);
990 lpath
= Fcons (p
- path
? make_string (path
, p
- path
) : Qnil
,
997 return Fnreverse (lpath
);
1004 defsubr (&Sdump_emacs_data
);
1006 defsubr (&Sdump_emacs
);
1010 defsubr (&Skill_emacs
);
1012 defsubr (&Sinvocation_name
);
1013 defsubr (&Sinvocation_directory
);
1015 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
1016 "Args passed by shell to Emacs, as a list of strings.");
1018 DEFVAR_LISP ("system-type", &Vsystem_type
,
1019 "Value is symbol indicating type of operating system you are using.");
1020 Vsystem_type
= intern (SYSTEM_TYPE
);
1022 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
1023 "Value is string indicating configuration Emacs was built for.");
1024 Vsystem_configuration
= build_string (EMACS_CONFIGURATION
);
1026 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
1027 "Non-nil means Emacs is running without interactive terminal.");
1029 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
1030 "Hook to be run whenever kill-emacs is called.\n\
1031 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1032 in other similar situations), functions placed on this hook should not\n\
1033 expect to be able to interact with the user.");
1034 Vkill_emacs_hook
= Qnil
;
1036 DEFVAR_INT ("emacs-priority", &emacs_priority
,
1037 "Priority for Emacs to run at.\n\
1038 This value is effective only if set before Emacs is dumped,\n\
1039 and only if the Emacs executable is installed with setuid to permit\n\
1040 it to change priority. (Emacs sets its uid back to the real uid.)\n\
1041 Currently, you need to define SET_EMACS_PRIORITY in `config.h'\n\
1042 before you compile Emacs, to enable the code for this feature.");
1045 DEFVAR_LISP ("invocation-name", &Vinvocation_name
,
1046 "The program name that was used to run Emacs.\n\
1047 Any directory names are omitted.");
1049 DEFVAR_LISP ("invocation-directory", &Vinvocation_directory
,
1050 "The directory in which the Emacs executable was found, to run it.\n\
1051 The value is nil if that directory's name is not known.");
1053 DEFVAR_LISP ("installation-directory", &Vinstallation_directory
,
1054 "A directory within which to look for the `lib-src' and `etc' directories.\n\
1055 This is non-nil when we can't find those directories in their standard\n\
1056 installed locations, but we can find them\n\
1057 near where the Emacs executable was found.");
1058 Vinstallation_directory
= Qnil
;