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 /* Signal code for the fatal signal that was received */
133 int fatal_error_code
;
135 /* Nonzero if handling a fatal error already */
136 int fatal_error_in_progress
;
138 /* Handle bus errors, illegal instruction, etc. */
140 fatal_error_signal (sig
)
143 fatal_error_code
= sig
;
144 signal (sig
, SIG_DFL
);
146 /* If fatal error occurs in code below, avoid infinite recursion. */
147 if (! fatal_error_in_progress
)
149 fatal_error_in_progress
= 1;
151 shut_down_emacs (sig
, 0, Qnil
);
155 LIB$
STOP (SS$_ABORT
);
157 /* Signal the same code; this time it will really be fatal.
158 Remember that since we're in a signal handler, the signal we're
159 going to send is probably blocked, so we have to unblock it if we
160 want to really receive it. */
162 sigunblock (sigmask (fatal_error_code
));
164 kill (getpid (), fatal_error_code
);
170 /* Handler for SIGDANGER. */
172 memory_warning_signal (sig
)
175 signal (sig
, memory_warning_signal
);
177 malloc_warning ("Operating system warns that virtual memory is running low.\n");
181 /* Code for dealing with Lisp access to the Unix command line */
184 init_cmdargs (argc
, argv
, skip_args
)
190 Lisp_Object name
, dir
;
192 Vinvocation_name
= Ffile_name_nondirectory (build_string (argv
[0]));
193 Vinvocation_directory
= Ffile_name_directory (build_string (argv
[0]));
194 /* If we got no directory in argv[0], search PATH to find where
195 Emacs actually came from. */
196 if (NILP (Vinvocation_directory
))
199 int yes
= openp (Vexec_path
, Vinvocation_name
,
200 EXEC_SUFFIXES
, &found
, 1);
202 Vinvocation_directory
= Ffile_name_directory (found
);
205 Vinstallation_directory
= Qnil
;
207 if (!NILP (Vinvocation_directory
))
209 dir
= Vinvocation_directory
;
210 name
= Fexpand_file_name (Vinvocation_name
, dir
);
213 Lisp_Object tem
, lisp_exists
, lib_src_exists
;
214 Lisp_Object etc_exists
, info_exists
;
216 /* See if dir contains subdirs for use by Emacs. */
217 tem
= Fexpand_file_name (build_string ("lisp"), dir
);
218 lisp_exists
= Ffile_exists_p (tem
);
219 if (!NILP (lisp_exists
))
221 tem
= Fexpand_file_name (build_string ("lib-src"), dir
);
222 lib_src_exists
= Ffile_exists_p (tem
);
223 if (!NILP (lib_src_exists
))
225 tem
= Fexpand_file_name (build_string ("etc"), dir
);
226 etc_exists
= Ffile_exists_p (tem
);
227 if (!NILP (etc_exists
))
229 tem
= Fexpand_file_name (build_string ("info"), dir
);
230 info_exists
= Ffile_exists_p (tem
);
231 if (!NILP (info_exists
))
233 Vinstallation_directory
234 = Ffile_name_as_directory (dir
);
241 /* See if dir's parent contains those subdirs. */
242 tem
= Fexpand_file_name (build_string ("../lisp"), dir
);
243 lisp_exists
= Ffile_exists_p (tem
);
244 if (!NILP (lisp_exists
))
246 tem
= Fexpand_file_name (build_string ("../lib-src"), dir
);
247 lib_src_exists
= Ffile_exists_p (tem
);
248 if (!NILP (lib_src_exists
))
250 tem
= Fexpand_file_name (build_string ("../etc"), dir
);
251 etc_exists
= Ffile_exists_p (tem
);
252 if (!NILP (etc_exists
))
254 tem
= Fexpand_file_name (build_string ("../info"), dir
);
255 info_exists
= Ffile_exists_p (tem
);
256 if (!NILP (info_exists
))
258 tem
= Fexpand_file_name (build_string (".."), dir
);
259 Vinstallation_directory
260 = Ffile_name_as_directory (tem
);
267 /* If the Emacs executable is actually a link,
268 next try the dir that the link points into. */
269 tem
= Ffile_symlink_p (name
);
273 dir
= Ffile_name_directory (name
);
280 Vcommand_line_args
= Qnil
;
282 for (i
= argc
- 1; i
>= 0; i
--)
284 if (i
== 0 || i
> skip_args
)
286 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
290 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
291 "Return the program name that was used to run Emacs.\n\
292 Any directory names are omitted.")
295 return Fcopy_sequence (Vinvocation_name
);
298 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
300 "Return the directory name in which the Emacs executable was located")
303 return Fcopy_sequence (Vinvocation_directory
);
308 #ifdef LINK_CRTL_SHARE
309 #ifdef SHAREABLE_LIB_BUG
310 extern noshare
char **environ
;
311 #endif /* SHAREABLE_LIB_BUG */
312 #endif /* LINK_CRTL_SHARE */
315 #ifndef ORDINARY_LINK
316 /* We don't include crtbegin.o and crtend.o in the link,
317 so these functions and variables might be missed.
318 Provide dummy definitions to avoid error.
319 (We don't have any real constructors or destructors.) */
323 __do_global_ctors_aux ()
327 /* Linux has a bug in its library; avoid an error. */
329 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
331 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
334 #endif /* __GNUC__ */
335 #endif /* ORDINARY_LINK */
338 main (argc
, argv
, envp
)
343 char stack_bottom_variable
;
348 /* Map in shared memory, if we are using that. */
350 if (argc
> 1 && !strcmp (argv
[1], "-nl"))
353 /* The shared memory was just restored, which clobbered this. */
359 /* The shared memory was just restored, which clobbered this. */
365 extern int malloc_cookie
;
367 /* This helps out unexnext.c. */
369 if (malloc_jumpstart (malloc_cookie
) != 0)
370 printf ("malloc jumpstart failed!\n");
373 #ifdef HAVE_X_WINDOWS
374 /* Stupid kludge to catch command-line display spec. We can't
375 handle this argument entirely in window system dependent code
376 because we don't even know which window system dependent code
377 to run until we've recognized this argument. */
381 for (i
= 1; (i
< argc
&& ! display_arg
); i
++)
382 if (!strcmp (argv
[i
], "-d") || !strcmp (argv
[i
], "-display"))
388 /* If -map specified, map the data file in */
389 if (argc
> 2 && ! strcmp (argv
[1], "-map"))
392 mapin_data (argv
[2]);
395 #ifdef LINK_CRTL_SHARE
396 #ifdef SHAREABLE_LIB_BUG
397 /* Bletcherous shared libraries! */
399 stdin
= fdopen (0, "r");
401 stdout
= fdopen (1, "w");
403 stderr
= fdopen (2, "w");
406 #endif /* SHAREABLE_LIB_BUG */
407 #endif /* LINK_CRTL_SHARE */
410 /* Record (approximately) where the stack begins. */
411 stack_bottom
= &stack_bottom_variable
;
413 #ifdef RUN_TIME_REMAP
415 run_time_remap (argv
[0]);
418 #ifdef USG_SHARED_LIBRARIES
428 inherited_pgroup
= EMACS_GETPGRP (0);
429 setpgrp (0, getpid ());
432 #if defined (USG5) && defined (INTERRUPT_INPUT)
440 /* If USE_DOMAIN_ACLS environment variable exists,
441 use ACLs rather than UNIX modes. */
442 if (egetenv ("USE_DOMAIN_ACLS"))
443 default_acl (USE_DEFACL
);
447 #ifndef SYSTEM_MALLOC
450 /* Arrange to get warning messages as memory fills up. */
451 memory_warnings (0, malloc_warning
);
453 /* Arrange to disable interrupt input while malloc and friends are
455 uninterrupt_malloc ();
457 #endif /* not SYSTEM_MALLOC */
460 /* We do all file input/output as binary files. When we need to translate
461 newlines, we do that manually. */
463 (stdin
)->_flag
&= ~_IOTEXT
;
464 (stdout
)->_flag
&= ~_IOTEXT
;
465 (stderr
)->_flag
&= ~_IOTEXT
;
470 nice (emacs_priority
);
472 #endif /* PRIO_PROCESS */
474 inhibit_window_system
= 0;
476 /* Handle the -t switch, which specifies filename to use as terminal */
477 if (skip_args
+ 2 < argc
&& !strcmp (argv
[skip_args
+ 1], "-t"))
483 result
= open (argv
[skip_args
], O_RDWR
, 2 );
486 char *errstring
= strerror (errno
);
487 fprintf (stderr
, "emacs: %s: %s\n", argv
[skip_args
], errstring
);
493 fprintf (stderr
, "emacs: %s: not a tty\n", argv
[skip_args
]);
496 fprintf (stderr
, "Using %s\n", argv
[skip_args
]);
497 #ifdef HAVE_X_WINDOWS
498 inhibit_window_system
= 1; /* -t => -nw */
502 if (skip_args
+ 1 < argc
503 && (!strcmp (argv
[skip_args
+ 1], "-nw")))
506 inhibit_window_system
= 1;
509 /* Handle the -batch switch, which means don't do interactive display. */
511 if (skip_args
+ 1 < argc
&& !strcmp (argv
[skip_args
+ 1], "-batch"))
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 */
697 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
704 #ifdef HAVE_X_WINDOWS
713 #endif /* HAVE_X_MENU */
714 #endif /* HAVE_X_WINDOWS */
724 keys_of_casefiddle ();
737 /* Handle -l loadup-and-dump, args passed by Makefile. */
738 if (argc
> 2 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-l"))
739 Vtop_level
= Fcons (intern ("load"),
740 Fcons (build_string (argv
[2 + skip_args
]), Qnil
));
742 /* Unless next switch is -nl, load "loadup.el" first thing. */
743 if (!(argc
> 1 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-nl")))
744 Vtop_level
= Fcons (intern ("load"),
745 Fcons (build_string ("loadup.el"), Qnil
));
746 #endif /* CANNOT_DUMP */
751 #if defined (sun) || defined (LOCALTIME_CACHE)
752 /* sun's localtime has a bug. it caches the value of the time
753 zone rather than looking it up every time. Since localtime() is
754 called to bolt the undumping time into the undumped emacs, this
755 results in localtime ignoring the TZ environment variable.
756 This flushes the new TZ value into localtime. */
758 #endif /* defined (sun) || defined (LOCALTIME_CACHE) */
760 /* Enter editor command loop. This never returns. */
765 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
766 "Exit the Emacs job and kill it.\n\
767 If ARG is an integer, return ARG as the exit program code.\n\
768 If ARG is a string, stuff it as keyboard input.\n\n\
769 The value of `kill-emacs-hook', if not void,\n\
770 is a list of functions (of no args),\n\
771 all of which are called before Emacs is actually killed.")
775 Lisp_Object hook
, hook1
;
784 if (!NILP (Vrun_hooks
) && !noninteractive
)
785 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
789 /* Is it really necessary to do this deassign
790 when we are going to exit anyway? */
795 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
797 exit ((XTYPE (arg
) == Lisp_Int
) ? XINT (arg
)
808 /* Perform an orderly shutdown of Emacs. Autosave any modified
809 buffers, kill any child processes, clean up the terminal modes (if
810 we're in the foreground), and other stuff like that. Don't perform
811 any redisplay; this may be called when Emacs is shutting down in
812 the background, or after its X connection has died.
814 If SIG is a signal number, print a message for it.
816 This is called by fatal signal handlers, X protocol error handlers,
820 shut_down_emacs (sig
, no_x
, stuff
)
824 /* Prevent running of hooks from now on. */
827 /* If we are controlling the terminal, reset terminal modes */
828 #ifdef EMACS_HAVE_TTY_PGRP
830 int pgrp
= EMACS_GETPGRP (0);
833 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
838 if (sig
&& sig
!= SIGTERM
)
839 fprintf (stderr
, "Fatal error (%d).", sig
);
847 stuff_buffered_input (stuff
);
849 kill_buffer_processes (Qnil
);
850 Fdo_auto_save (Qt
, Qnil
);
852 #ifdef CLASH_DETECTION
857 kill_vms_processes ();
860 #ifdef HAVE_X_WINDOWS
861 if (!noninteractive
&& EQ (Vwindow_system
, intern ("x")) && ! no_x
)
862 Fx_close_current_connection ();
863 #endif /* HAVE_X_WINDOWS */
866 /* There is a tendency for a SIGIO signal to arrive within exit,
867 and cause a SIGHUP because the input descriptor is already closed. */
869 signal (SIGIO
, SIG_IGN
);
876 /* Nothing like this can be implemented on an Apollo.
881 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
882 "Dump current state of Emacs into data file FILENAME.\n\
883 This function exists on systems that use HAVE_SHM.")
885 Lisp_Object intoname
;
890 CHECK_STRING (intoname
, 0);
891 intoname
= Fexpand_file_name (intoname
, Qnil
);
897 /* Tell malloc where start of impure now is */
898 /* Also arrange for warnings when nearly out of space. */
899 #ifndef SYSTEM_MALLOC
900 memory_warnings (&my_edata
, malloc_warning
);
902 map_out_data (XSTRING (intoname
)->data
);
909 #else /* not HAVE_SHM */
911 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
912 "Dump current state of Emacs into executable file FILENAME.\n\
913 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
914 This is used in the file `loadup.el' when building Emacs.\n\
916 Bind `command-line-processed' to nil before dumping,\n\
917 if you want the dumped Emacs to process its command line\n\
918 and announce itself normally when it is run.")
920 Lisp_Object intoname
, symname
;
925 CHECK_STRING (intoname
, 0);
926 intoname
= Fexpand_file_name (intoname
, Qnil
);
929 CHECK_STRING (symname
, 0);
930 if (XSTRING (symname
)->size
)
931 symname
= Fexpand_file_name (symname
, Qnil
);
939 mapout_data (XSTRING (intoname
)->data
);
941 /* Tell malloc where start of impure now is */
942 /* Also arrange for warnings when nearly out of space. */
943 #ifndef SYSTEM_MALLOC
944 memory_warnings (&my_edata
, malloc_warning
);
946 unexec (XSTRING (intoname
)->data
,
947 !NILP (symname
) ? XSTRING (symname
)->data
: 0, &my_edata
, 0, 0);
955 #endif /* not HAVE_SHM */
957 #endif /* not CANNOT_DUMP */
964 decode_env_path (evarname
, defalt
)
965 char *evarname
, *defalt
;
967 register char *path
, *p
;
971 /* It's okay to use getenv here, because this function is only used
972 to initialize variables when Emacs starts up, and isn't called
975 path
= (char *) getenv (evarname
);
983 p
= index (path
, SEPCHAR
);
984 if (!p
) p
= path
+ strlen (path
);
985 lpath
= Fcons (p
- path
? make_string (path
, p
- path
) : Qnil
,
992 return Fnreverse (lpath
);
999 defsubr (&Sdump_emacs_data
);
1001 defsubr (&Sdump_emacs
);
1005 defsubr (&Skill_emacs
);
1007 defsubr (&Sinvocation_name
);
1008 defsubr (&Sinvocation_directory
);
1010 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
1011 "Args passed by shell to Emacs, as a list of strings.");
1013 DEFVAR_LISP ("system-type", &Vsystem_type
,
1014 "Value is symbol indicating type of operating system you are using.");
1015 Vsystem_type
= intern (SYSTEM_TYPE
);
1017 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
1018 "Value is string indicating configuration Emacs was built for.");
1019 Vsystem_configuration
= build_string (CONFIGURATION
);
1021 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
1022 "Non-nil means Emacs is running without interactive terminal.");
1024 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
1025 "Hook to be run whenever kill-emacs is called.\n\
1026 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1027 in other similar situations), functions placed on this hook should not\n\
1028 expect to be able to interact with the user.");
1029 Vkill_emacs_hook
= Qnil
;
1031 DEFVAR_INT ("emacs-priority", &emacs_priority
,
1032 "Priority for Emacs to run at.\n\
1033 This value is effective only if set before Emacs is dumped,\n\
1034 and only if the Emacs executable is installed with setuid to permit\n\
1035 it to change priority. (Emacs sets its uid back to the real uid.)");
1038 staticpro (&Vinstallation_directory
);
1039 Vinstallation_directory
= Qnil
;
1040 staticpro (&Vinvocation_name
);
1041 Vinvocation_name
= Qnil
;
1042 staticpro (&Vinvocation_directory
);
1043 Vinvocation_directory
= Qnil
;