1 /* Fully extensible Emacs, running on Unix, intended for GNU.
2 Copyright (C) 1985, 1986, 1987, 1993 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"
55 /* Command line args from shell, as list of strings */
56 Lisp_Object Vcommand_line_args
;
58 /* The name under which Emacs was invoked, with any leading directory
60 Lisp_Object Vinvocation_name
;
62 /* The directory name from which Emacs was invoked. */
63 Lisp_Object Vinvocation_directory
;
65 /* Hook run by `kill-emacs' before it does really anything. */
66 Lisp_Object Vkill_emacs_hook
;
68 /* Set nonzero after Emacs has started up the first time.
69 Prevents reinitialization of the Lisp world and keymaps
70 on subsequent starts. */
73 /* Variable whose value is symbol giving operating system type */
74 Lisp_Object Vsystem_type
;
76 /* If non-zero, emacs should not attempt to use an window-specific code,
77 but instead should use the virtual terminal under which it was started */
78 int inhibit_window_system
;
80 /* If nonzero, set Emacs to run at this priority. This is also used
81 in child_setup and sys_suspend to make sure subshells run at normal
82 priority; Those functions have their own extern declaration. */
87 extern int inherited_pgroup
;
91 /* If non-zero, -d was specified, meaning we're using some window system. */
95 /* An address near the bottom of the stack.
96 Tells GC how to save a copy of the stack. */
100 extern Lisp_Object Vwindow_system
;
101 #endif /* HAVE_X_WINDOWS */
103 #ifdef USG_SHARED_LIBRARIES
104 /* If nonzero, this is the place to put the end of the writable segment
107 unsigned int bss_end
= 0;
110 /* Nonzero means running Emacs without interactive terminal. */
114 /* Value of Lisp variable `noninteractive'.
115 Normally same as C variable `noninteractive'
116 but nothing terrible happens if user sets this one. */
120 /* Signal code for the fatal signal that was received */
121 int fatal_error_code
;
123 /* Nonzero if handling a fatal error already */
124 int fatal_error_in_progress
;
126 /* Handle bus errors, illegal instruction, etc. */
128 fatal_error_signal (sig
)
131 fatal_error_code
= sig
;
132 signal (sig
, SIG_DFL
);
134 /* If fatal error occurs in code below, avoid infinite recursion. */
135 if (! fatal_error_in_progress
)
137 fatal_error_in_progress
= 1;
139 shut_down_emacs (sig
, 0, Qnil
);
143 LIB$
STOP (SS$_ABORT
);
145 /* Signal the same code; this time it will really be fatal.
146 Remember that since we're in a signal handler, the signal we're
147 going to send is probably blocked, so we have to unblock it if we
148 want to really receive it. */
149 sigunblock (sigmask (fatal_error_code
));
150 kill (getpid (), fatal_error_code
);
154 /* Code for dealing with Lisp access to the Unix command line */
157 init_cmdargs (argc
, argv
, skip_args
)
164 Vinvocation_name
= Ffile_name_nondirectory (build_string (argv
[0]));
165 Vinvocation_directory
= Ffile_name_directory (build_string (argv
[0]));
166 /* If we got no directory in argv[0], search PATH to find where
167 Emacs actually came from. */
168 if (NILP (Vinvocation_directory
))
171 int yes
= openp (Vexec_path
, Vinvocation_name
,
174 Vinvocation_directory
= Ffile_name_directory (found
);
177 Vcommand_line_args
= Qnil
;
179 for (i
= argc
- 1; i
>= 0; i
--)
181 if (i
== 0 || i
> skip_args
)
183 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
187 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
188 "Return the program name that was used to run Emacs.\n\
189 Any directory names are omitted.")
192 return Fcopy_sequence (Vinvocation_name
);
195 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
197 "Return the directory name in which the Emacs executable was located")
200 return Fcopy_sequence (Vinvocation_directory
);
205 #ifdef LINK_CRTL_SHARE
206 #ifdef SHAREABLE_LIB_BUG
207 extern noshare
char **environ
;
208 #endif /* SHAREABLE_LIB_BUG */
209 #endif /* LINK_CRTL_SHARE */
212 #ifndef ORDINARY_LINK
213 /* We don't include crtbegin.o and crtend.o in the link,
214 so these functions and variables might be missed.
215 Provide dummy definitions to avoid error.
216 (We don't have any real constructors or destructors.) */
220 __do_global_ctors_aux ()
224 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
225 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
228 #endif /* __GNUC__ */
229 #endif /* ORDINARY_LINK */
232 main (argc
, argv
, envp
)
237 char stack_bottom_variable
;
241 extern char *sys_errlist
[];
242 extern void malloc_warning ();
244 /* Map in shared memory, if we are using that. */
246 if (argc
> 1 && !strcmp (argv
[1], "-nl"))
249 /* The shared memory was just restored, which clobbered this. */
255 /* The shared memory was just restored, which clobbered this. */
261 extern int malloc_cookie
;
263 /* This helps out unexnext.c. */
265 if (malloc_jumpstart (malloc_cookie
) != 0)
266 printf ("malloc jumpstart failed!\n");
269 #ifdef HAVE_X_WINDOWS
270 /* Stupid kludge to catch command-line display spec. We can't
271 handle this argument entirely in window system dependent code
272 because we don't even know which window system dependent code
273 to run until we've recognized this argument. */
277 for (i
= 1; (i
< argc
&& ! display_arg
); i
++)
278 if (!strcmp (argv
[i
], "-d") || !strcmp (argv
[i
], "-display"))
284 /* If -map specified, map the data file in */
285 if (argc
> 2 && ! strcmp (argv
[1], "-map"))
288 mapin_data (argv
[2]);
291 #ifdef LINK_CRTL_SHARE
292 #ifdef SHAREABLE_LIB_BUG
293 /* Bletcherous shared libraries! */
295 stdin
= fdopen (0, "r");
297 stdout
= fdopen (1, "w");
299 stderr
= fdopen (2, "w");
302 #endif /* SHAREABLE_LIB_BUG */
303 #endif /* LINK_CRTL_SHARE */
306 /* Record (approximately) where the stack begins. */
307 stack_bottom
= &stack_bottom_variable
;
309 #ifdef RUN_TIME_REMAP
311 run_time_remap (argv
[0]);
314 #ifdef USG_SHARED_LIBRARIES
323 inherited_pgroup
= getpgrp (0);
324 setpgrp (0, getpid ());
331 /* If USE_DOMAIN_ACLS environment variable exists,
332 use ACLs rather than UNIX modes. */
333 if (egetenv ("USE_DOMAIN_ACLS"))
334 default_acl (USE_DEFACL
);
338 #ifndef SYSTEM_MALLOC
341 /* Arrange to get warning messages as memory fills up. */
342 memory_warnings (0, malloc_warning
);
344 /* Arrange to disable interrupt input while malloc and friends are
346 uninterrupt_malloc ();
348 #endif /* not SYSTEM_MALLOC */
352 nice (emacs_priority
);
354 #endif /* PRIO_PROCESS */
356 inhibit_window_system
= 0;
358 /* Handle the -t switch, which specifies filename to use as terminal */
359 if (skip_args
+ 2 < argc
&& !strcmp (argv
[skip_args
+ 1], "-t"))
365 result
= open (argv
[skip_args
], O_RDWR
, 2 );
370 if (errno
>= 0 && errno
< sys_nerr
)
371 errstring
= sys_errlist
[errno
];
373 errstring
= "undocumented error code";
374 fprintf (stderr
, "emacs: %s: %s\n", argv
[skip_args
], errstring
);
380 fprintf (stderr
, "emacs: %s: not a tty\n", argv
[skip_args
]);
383 fprintf (stderr
, "Using %s\n", argv
[skip_args
]);
384 #ifdef HAVE_X_WINDOWS
385 inhibit_window_system
= 1; /* -t => -nw */
389 if (skip_args
+ 1 < argc
390 && (!strcmp (argv
[skip_args
+ 1], "-nw")))
393 inhibit_window_system
= 1;
396 /* Handle the -batch switch, which means don't do interactive display. */
398 if (skip_args
+ 1 < argc
&& !strcmp (argv
[skip_args
+ 1], "-batch"))
410 ! noninteractive
|| initialized
416 /* Don't catch these signals in batch mode if not initialized.
417 On some machines, this sets static data that would make
418 signal fail to work right when the dumped Emacs is run. */
419 signal (SIGHUP
, fatal_error_signal
);
420 signal (SIGQUIT
, fatal_error_signal
);
421 signal (SIGILL
, fatal_error_signal
);
422 signal (SIGTRAP
, fatal_error_signal
);
424 /* This is missing on some systems - OS/2, for example. */
425 signal (SIGIOT
, fatal_error_signal
);
428 signal (SIGEMT
, fatal_error_signal
);
430 signal (SIGFPE
, fatal_error_signal
);
432 signal (SIGBUS
, fatal_error_signal
);
434 signal (SIGSEGV
, fatal_error_signal
);
436 signal (SIGSYS
, fatal_error_signal
);
438 signal (SIGTERM
, fatal_error_signal
);
440 signal (SIGXCPU
, fatal_error_signal
);
443 signal (SIGXFSZ
, fatal_error_signal
);
447 signal (SIGDANGER
, fatal_error_signal
);
448 signal (20, fatal_error_signal
);
449 signal (21, fatal_error_signal
);
450 signal (22, fatal_error_signal
);
451 signal (23, fatal_error_signal
);
452 signal (24, fatal_error_signal
);
454 signal (SIGAIO
, fatal_error_signal
);
455 signal (SIGPTY
, fatal_error_signal
);
458 signal (SIGIOINT
, fatal_error_signal
);
460 signal (SIGGRANT
, fatal_error_signal
);
461 signal (SIGRETRACT
, fatal_error_signal
);
462 signal (SIGSOUND
, fatal_error_signal
);
463 signal (SIGMSG
, fatal_error_signal
);
467 noninteractive1
= noninteractive
;
469 /* Perform basic initializations (not merely interning symbols) */
476 init_syntax_once (); /* Create standard syntax table. */
477 /* Must be done before init_buffer */
478 init_casetab_once ();
479 init_buffer_once (); /* Create buffer table and some buffers */
480 init_minibuf_once (); /* Create list of minibuffers */
481 /* Must precede init_window_once */
482 init_window_once (); /* Init the window system */
489 /* egetenv is a pretty low-level facility, which may get called in
490 many circumstances; it seems flimsy to put off initializing it
491 until calling init_callproc. */
492 set_process_environment ();
494 init_buffer (); /* Init default directory of main buffer */
496 init_callproc (); /* Must precede init_cmdargs and init_sys_modes. */
497 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
503 init_vms_input ();/* init_display calls get_frame_size, that needs this */
505 init_display (); /* Determine terminal type. init_sys_modes uses results */
507 init_keyboard (); /* This too must precede init_sys_modes */
509 init_vmsproc (); /* And this too. */
511 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
515 #ifdef LISP_FLOAT_TYPE
522 #ifdef CLASH_DETECTION
524 #endif /* CLASH_DETECTION */
526 /* Intern the names of all standard functions and variables; define standard keys */
530 /* The basic levels of Lisp must come first */
531 /* And data must come first of all
532 for the sake of symbols like error-message */
545 syms_of_casefiddle ();
549 #ifndef NO_DIR_LIBRARY
551 #endif /* not NO_DIR_LIBRARY */
557 #ifdef CLASH_DETECTION
559 #endif /* CLASH_DETECTION */
573 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
580 #ifdef HAVE_X_WINDOWS
589 #endif /* HAVE_X_MENU */
590 #endif /* HAVE_X_WINDOWS */
600 keys_of_casefiddle ();
613 /* Handle -l loadup-and-dump, args passed by Makefile. */
614 if (argc
> 2 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-l"))
615 Vtop_level
= Fcons (intern ("load"),
616 Fcons (build_string (argv
[2 + skip_args
]), Qnil
));
618 /* Unless next switch is -nl, load "loadup.el" first thing. */
619 if (!(argc
> 1 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-nl")))
620 Vtop_level
= Fcons (intern ("load"),
621 Fcons (build_string ("loadup.el"), Qnil
));
622 #endif /* CANNOT_DUMP */
627 #if defined (sun) || defined (LOCALTIME_CACHE)
628 /* sun's localtime has a bug. it caches the value of the time
629 zone rather than looking it up every time. Since localtime() is
630 called to bolt the undumping time into the undumped emacs, this
631 results in localtime ignoring the TZ environment variable.
632 This flushes the new TZ value into localtime. */
634 #endif /* defined (sun) || defined (LOCALTIME_CACHE) */
636 /* Enter editor command loop. This never returns. */
641 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
642 "Exit the Emacs job and kill it.\n\
643 If ARG is an integer, return ARG as the exit program code.\n\
644 If ARG is a string, stuff it as keyboard input.\n\n\
645 The value of `kill-emacs-hook', if not void,\n\
646 is a list of functions (of no args),\n\
647 all of which are called before Emacs is actually killed.")
651 Lisp_Object hook
, hook1
;
660 if (!NILP (Vrun_hooks
) && !noninteractive
)
661 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
665 /* Is it really necessary to do this deassign
666 when we are going to exit anyway? */
671 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
673 exit ((XTYPE (arg
) == Lisp_Int
) ? XINT (arg
)
684 /* Perform an orderly shutdown of Emacs. Autosave any modified
685 buffers, kill any child processes, clean up the terminal modes (if
686 we're in the foreground), and other stuff like that. Don't perform
687 any redisplay; this may be called when Emacs is shutting down in
688 the background, or after its X connection has died.
690 If SIG is a signal number, print a message for it.
692 This is called by fatal signal handlers, X protocol error handlers,
696 shut_down_emacs (sig
, no_x
, stuff
)
700 /* If we are controlling the terminal, reset terminal modes */
701 #ifdef EMACS_HAVE_TTY_PGRP
704 int pgrp
= getpgrp ();
706 int pgrp
= getpgrp (0);
709 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
714 if (sig
&& sig
!= SIGTERM
)
715 fprintf (stderr
, "Fatal error (%d).", sig
);
723 stuff_buffered_input (stuff
);
725 kill_buffer_processes (Qnil
);
726 Fdo_auto_save (Qt
, Qnil
);
728 #ifdef CLASH_DETECTION
733 kill_vms_processes ();
736 #ifdef HAVE_X_WINDOWS
737 if (!noninteractive
&& EQ (Vwindow_system
, intern ("x")) && ! no_x
)
738 Fx_close_current_connection ();
739 #endif /* HAVE_X_WINDOWS */
742 /* There is a tendency for a SIGIO signal to arrive within exit,
743 and cause a SIGHUP because the input descriptor is already closed. */
745 signal (SIGIO
, SIG_IGN
);
752 /* Nothing like this can be implemented on an Apollo.
757 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
758 "Dump current state of Emacs into data file FILENAME.\n\
759 This function exists on systems that use HAVE_SHM.")
761 Lisp_Object intoname
;
765 extern void malloc_warning ();
767 CHECK_STRING (intoname
, 0);
768 intoname
= Fexpand_file_name (intoname
, Qnil
);
774 /* Tell malloc where start of impure now is */
775 /* Also arrange for warnings when nearly out of space. */
776 #ifndef SYSTEM_MALLOC
777 memory_warnings (&my_edata
, malloc_warning
);
779 map_out_data (XSTRING (intoname
)->data
);
786 #else /* not HAVE_SHM */
788 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
789 "Dump current state of Emacs into executable file FILENAME.\n\
790 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
791 This is used in the file `loadup.el' when building Emacs.\n\
793 Bind `command-line-processed' to nil before dumping,\n\
794 if you want the dumped Emacs to process its command line\n\
795 and announce itself normally when it is run.")
797 Lisp_Object intoname
, symname
;
801 extern void malloc_warning ();
803 CHECK_STRING (intoname
, 0);
804 intoname
= Fexpand_file_name (intoname
, Qnil
);
807 CHECK_STRING (symname
, 0);
808 if (XSTRING (symname
)->size
)
809 symname
= Fexpand_file_name (symname
, Qnil
);
817 mapout_data (XSTRING (intoname
)->data
);
819 /* Tell malloc where start of impure now is */
820 /* Also arrange for warnings when nearly out of space. */
821 #ifndef SYSTEM_MALLOC
822 memory_warnings (&my_edata
, malloc_warning
);
824 unexec (XSTRING (intoname
)->data
,
825 !NILP (symname
) ? XSTRING (symname
)->data
: 0, &my_edata
, 0, 0);
833 #endif /* not HAVE_SHM */
835 #endif /* not CANNOT_DUMP */
842 decode_env_path (evarname
, defalt
)
843 char *evarname
, *defalt
;
845 register char *path
, *p
;
846 extern char *index ();
850 /* It's okay to use getenv here, because this function is only used
851 to initialize variables when Emacs starts up, and isn't called
854 path
= (char *) getenv (evarname
);
862 p
= index (path
, SEPCHAR
);
863 if (!p
) p
= path
+ strlen (path
);
864 lpath
= Fcons (p
- path
? make_string (path
, p
- path
) : Qnil
,
871 return Fnreverse (lpath
);
878 defsubr (&Sdump_emacs_data
);
880 defsubr (&Sdump_emacs
);
884 defsubr (&Skill_emacs
);
886 defsubr (&Sinvocation_name
);
887 defsubr (&Sinvocation_directory
);
889 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
890 "Args passed by shell to Emacs, as a list of strings.");
892 DEFVAR_LISP ("system-type", &Vsystem_type
,
893 "Value is symbol indicating type of operating system you are using.");
894 Vsystem_type
= intern (SYSTEM_TYPE
);
896 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
897 "Non-nil means Emacs is running without interactive terminal.");
899 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
900 "Hook to be run whenever kill-emacs is called.\n\
901 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
902 in other similar situations), functions placed on this hook should not\n\
903 expect to be able to interact with the user.");
904 Vkill_emacs_hook
= Qnil
;
906 DEFVAR_INT ("emacs-priority", &emacs_priority
,
907 "Priority for Emacs to run at.\n\
908 This value is effective only if set before Emacs is dumped,\n\
909 and only if the Emacs executable is installed with setuid to permit\n\
910 it to change priority. (Emacs sets its uid back to the real uid.)");
913 staticpro (&Vinvocation_name
);
914 Vinvocation_name
= Qnil
;
915 staticpro (&Vinvocation_directory
);
916 Vinvocation_directory
= Qnil
;