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.) */
321 #ifndef GCC_CTORS_IN_LIBC
324 __do_global_ctors_aux ()
328 /* Linux has a bug in its library; avoid an error. */
330 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
332 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
333 #endif /* GCC_CTORS_IN_LIBC */
336 #endif /* __GNUC__ */
337 #endif /* ORDINARY_LINK */
340 main (argc
, argv
, envp
)
345 char stack_bottom_variable
;
350 /* Map in shared memory, if we are using that. */
352 if (argc
> 1 && !strcmp (argv
[1], "-nl"))
355 /* The shared memory was just restored, which clobbered this. */
361 /* The shared memory was just restored, which clobbered this. */
367 extern int malloc_cookie
;
369 /* This helps out unexnext.c. */
371 if (malloc_jumpstart (malloc_cookie
) != 0)
372 printf ("malloc jumpstart failed!\n");
375 #ifdef HAVE_X_WINDOWS
376 /* Stupid kludge to catch command-line display spec. We can't
377 handle this argument entirely in window system dependent code
378 because we don't even know which window system dependent code
379 to run until we've recognized this argument. */
383 for (i
= 1; (i
< argc
&& ! display_arg
); i
++)
384 if (!strcmp (argv
[i
], "-d") || !strcmp (argv
[i
], "-display"))
390 /* If -map specified, map the data file in */
391 if (argc
> 2 && ! strcmp (argv
[1], "-map"))
394 mapin_data (argv
[2]);
397 #ifdef LINK_CRTL_SHARE
398 #ifdef SHAREABLE_LIB_BUG
399 /* Bletcherous shared libraries! */
401 stdin
= fdopen (0, "r");
403 stdout
= fdopen (1, "w");
405 stderr
= fdopen (2, "w");
408 #endif /* SHAREABLE_LIB_BUG */
409 #endif /* LINK_CRTL_SHARE */
412 /* Record (approximately) where the stack begins. */
413 stack_bottom
= &stack_bottom_variable
;
415 #ifdef RUN_TIME_REMAP
417 run_time_remap (argv
[0]);
420 #ifdef USG_SHARED_LIBRARIES
430 inherited_pgroup
= EMACS_GETPGRP (0);
431 setpgrp (0, getpid ());
434 #if defined (USG5) && defined (INTERRUPT_INPUT)
442 /* If USE_DOMAIN_ACLS environment variable exists,
443 use ACLs rather than UNIX modes. */
444 if (egetenv ("USE_DOMAIN_ACLS"))
445 default_acl (USE_DEFACL
);
449 #ifndef SYSTEM_MALLOC
452 /* Arrange to get warning messages as memory fills up. */
453 memory_warnings (0, malloc_warning
);
455 /* Arrange to disable interrupt input while malloc and friends are
457 uninterrupt_malloc ();
459 #endif /* not SYSTEM_MALLOC */
462 /* We do all file input/output as binary files. When we need to translate
463 newlines, we do that manually. */
465 (stdin
)->_flag
&= ~_IOTEXT
;
466 (stdout
)->_flag
&= ~_IOTEXT
;
467 (stderr
)->_flag
&= ~_IOTEXT
;
472 nice (emacs_priority
);
474 #endif /* PRIO_PROCESS */
476 inhibit_window_system
= 0;
478 /* Handle the -t switch, which specifies filename to use as terminal */
479 if (skip_args
+ 2 < argc
&& !strcmp (argv
[skip_args
+ 1], "-t"))
485 result
= open (argv
[skip_args
], O_RDWR
, 2 );
488 char *errstring
= strerror (errno
);
489 fprintf (stderr
, "emacs: %s: %s\n", argv
[skip_args
], errstring
);
495 fprintf (stderr
, "emacs: %s: not a tty\n", argv
[skip_args
]);
498 fprintf (stderr
, "Using %s\n", argv
[skip_args
]);
499 #ifdef HAVE_X_WINDOWS
500 inhibit_window_system
= 1; /* -t => -nw */
504 if (skip_args
+ 1 < argc
505 && (!strcmp (argv
[skip_args
+ 1], "-nw")))
508 inhibit_window_system
= 1;
511 /* Handle the -batch switch, which means don't do interactive display. */
513 if (skip_args
+ 1 < argc
&& !strcmp (argv
[skip_args
+ 1], "-batch"))
525 ! noninteractive
|| initialized
531 /* Don't catch these signals in batch mode if not initialized.
532 On some machines, this sets static data that would make
533 signal fail to work right when the dumped Emacs is run. */
534 signal (SIGHUP
, fatal_error_signal
);
535 signal (SIGQUIT
, fatal_error_signal
);
536 signal (SIGILL
, fatal_error_signal
);
537 signal (SIGTRAP
, fatal_error_signal
);
539 /* This is missing on some systems - OS/2, for example. */
540 signal (SIGIOT
, fatal_error_signal
);
543 signal (SIGEMT
, fatal_error_signal
);
545 signal (SIGFPE
, fatal_error_signal
);
547 signal (SIGBUS
, fatal_error_signal
);
549 signal (SIGSEGV
, fatal_error_signal
);
551 signal (SIGSYS
, fatal_error_signal
);
553 signal (SIGTERM
, fatal_error_signal
);
555 signal (SIGXCPU
, fatal_error_signal
);
558 signal (SIGXFSZ
, fatal_error_signal
);
562 /* This just means available memory is getting low. */
563 signal (SIGDANGER
, memory_warning_signal
);
567 /* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
568 signal (SIGXCPU
, fatal_error_signal
);
570 signal (SIGIOINT
, fatal_error_signal
);
572 signal (SIGGRANT
, fatal_error_signal
);
573 signal (SIGRETRACT
, fatal_error_signal
);
574 signal (SIGSOUND
, fatal_error_signal
);
575 signal (SIGMSG
, fatal_error_signal
);
579 noninteractive1
= noninteractive
;
581 /* Perform basic initializations (not merely interning symbols) */
588 init_syntax_once (); /* Create standard syntax table. */
589 /* Must be done before init_buffer */
590 init_casetab_once ();
591 init_buffer_once (); /* Create buffer table and some buffers */
592 init_minibuf_once (); /* Create list of minibuffers */
593 /* Must precede init_window_once */
594 init_window_once (); /* Init the window system */
602 /* Call early 'cause init_environment needs it. */
604 /* Set defaults for several environment variables. */
605 if (initialized
) init_environment (argc
, argv
, skip_args
);
608 /* egetenv is a pretty low-level facility, which may get called in
609 many circumstances; it seems flimsy to put off initializing it
610 until calling init_callproc. */
611 set_process_environment ();
612 /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
613 if this is not done. Do it after set_process_environment so that we
614 don't pollute Vprocess_environment. */
619 init_buffer (); /* Init default directory of main buffer */
621 init_callproc_1 (); /* Must precede init_cmdargs and init_sys_modes. */
622 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
623 init_callproc (); /* Must follow init_cmdargs but not init_sys_modes. */
629 init_vms_input ();/* init_display calls get_frame_size, that needs this */
631 init_display (); /* Determine terminal type. init_sys_modes uses results */
633 init_keyboard (); /* This too must precede init_sys_modes */
635 init_vmsproc (); /* And this too. */
637 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
641 #ifdef LISP_FLOAT_TYPE
648 #ifdef CLASH_DETECTION
650 #endif /* CLASH_DETECTION */
652 /* Intern the names of all standard functions and variables; define standard keys */
656 /* The basic levels of Lisp must come first */
657 /* And data must come first of all
658 for the sake of symbols like error-message */
671 syms_of_casefiddle ();
675 #ifndef NO_DIR_LIBRARY
677 #endif /* not NO_DIR_LIBRARY */
683 #ifdef CLASH_DETECTION
685 #endif /* CLASH_DETECTION */
699 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
706 #ifdef HAVE_X_WINDOWS
715 #endif /* HAVE_X_MENU */
716 #endif /* HAVE_X_WINDOWS */
726 keys_of_casefiddle ();
739 /* Handle -l loadup-and-dump, args passed by Makefile. */
740 if (argc
> 2 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-l"))
741 Vtop_level
= Fcons (intern ("load"),
742 Fcons (build_string (argv
[2 + skip_args
]), Qnil
));
744 /* Unless next switch is -nl, load "loadup.el" first thing. */
745 if (!(argc
> 1 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-nl")))
746 Vtop_level
= Fcons (intern ("load"),
747 Fcons (build_string ("loadup.el"), Qnil
));
748 #endif /* CANNOT_DUMP */
753 #if defined (sun) || defined (LOCALTIME_CACHE)
754 /* sun's localtime has a bug. it caches the value of the time
755 zone rather than looking it up every time. Since localtime() is
756 called to bolt the undumping time into the undumped emacs, this
757 results in localtime ignoring the TZ environment variable.
758 This flushes the new TZ value into localtime. */
760 #endif /* defined (sun) || defined (LOCALTIME_CACHE) */
762 /* Enter editor command loop. This never returns. */
767 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
768 "Exit the Emacs job and kill it.\n\
769 If ARG is an integer, return ARG as the exit program code.\n\
770 If ARG is a string, stuff it as keyboard input.\n\n\
771 The value of `kill-emacs-hook', if not void,\n\
772 is a list of functions (of no args),\n\
773 all of which are called before Emacs is actually killed.")
777 Lisp_Object hook
, hook1
;
786 if (!NILP (Vrun_hooks
) && !noninteractive
)
787 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
791 /* Is it really necessary to do this deassign
792 when we are going to exit anyway? */
797 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
799 exit ((XTYPE (arg
) == Lisp_Int
) ? XINT (arg
)
810 /* Perform an orderly shutdown of Emacs. Autosave any modified
811 buffers, kill any child processes, clean up the terminal modes (if
812 we're in the foreground), and other stuff like that. Don't perform
813 any redisplay; this may be called when Emacs is shutting down in
814 the background, or after its X connection has died.
816 If SIG is a signal number, print a message for it.
818 This is called by fatal signal handlers, X protocol error handlers,
822 shut_down_emacs (sig
, no_x
, stuff
)
826 /* Prevent running of hooks from now on. */
829 /* If we are controlling the terminal, reset terminal modes */
830 #ifdef EMACS_HAVE_TTY_PGRP
832 int pgrp
= EMACS_GETPGRP (0);
835 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
840 if (sig
&& sig
!= SIGTERM
)
841 fprintf (stderr
, "Fatal error (%d).", sig
);
849 stuff_buffered_input (stuff
);
851 kill_buffer_processes (Qnil
);
852 Fdo_auto_save (Qt
, Qnil
);
854 #ifdef CLASH_DETECTION
859 kill_vms_processes ();
862 #ifdef HAVE_X_WINDOWS
863 if (!noninteractive
&& EQ (Vwindow_system
, intern ("x")) && ! no_x
)
864 Fx_close_current_connection ();
865 #endif /* HAVE_X_WINDOWS */
868 /* There is a tendency for a SIGIO signal to arrive within exit,
869 and cause a SIGHUP because the input descriptor is already closed. */
871 signal (SIGIO
, SIG_IGN
);
878 /* Nothing like this can be implemented on an Apollo.
883 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
884 "Dump current state of Emacs into data file FILENAME.\n\
885 This function exists on systems that use HAVE_SHM.")
887 Lisp_Object intoname
;
892 CHECK_STRING (intoname
, 0);
893 intoname
= Fexpand_file_name (intoname
, Qnil
);
899 /* Tell malloc where start of impure now is */
900 /* Also arrange for warnings when nearly out of space. */
901 #ifndef SYSTEM_MALLOC
902 memory_warnings (&my_edata
, malloc_warning
);
904 map_out_data (XSTRING (intoname
)->data
);
911 #else /* not HAVE_SHM */
913 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
914 "Dump current state of Emacs into executable file FILENAME.\n\
915 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
916 This is used in the file `loadup.el' when building Emacs.\n\
918 Bind `command-line-processed' to nil before dumping,\n\
919 if you want the dumped Emacs to process its command line\n\
920 and announce itself normally when it is run.")
922 Lisp_Object intoname
, symname
;
927 CHECK_STRING (intoname
, 0);
928 intoname
= Fexpand_file_name (intoname
, Qnil
);
931 CHECK_STRING (symname
, 0);
932 if (XSTRING (symname
)->size
)
933 symname
= Fexpand_file_name (symname
, Qnil
);
941 mapout_data (XSTRING (intoname
)->data
);
943 /* Tell malloc where start of impure now is */
944 /* Also arrange for warnings when nearly out of space. */
945 #ifndef SYSTEM_MALLOC
946 memory_warnings (&my_edata
, malloc_warning
);
948 unexec (XSTRING (intoname
)->data
,
949 !NILP (symname
) ? XSTRING (symname
)->data
: 0, &my_edata
, 0, 0);
957 #endif /* not HAVE_SHM */
959 #endif /* not CANNOT_DUMP */
966 decode_env_path (evarname
, defalt
)
967 char *evarname
, *defalt
;
969 register char *path
, *p
;
973 /* It's okay to use getenv here, because this function is only used
974 to initialize variables when Emacs starts up, and isn't called
977 path
= (char *) getenv (evarname
);
985 p
= index (path
, SEPCHAR
);
986 if (!p
) p
= path
+ strlen (path
);
987 lpath
= Fcons (p
- path
? make_string (path
, p
- path
) : Qnil
,
994 return Fnreverse (lpath
);
1001 defsubr (&Sdump_emacs_data
);
1003 defsubr (&Sdump_emacs
);
1007 defsubr (&Skill_emacs
);
1009 defsubr (&Sinvocation_name
);
1010 defsubr (&Sinvocation_directory
);
1012 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
1013 "Args passed by shell to Emacs, as a list of strings.");
1015 DEFVAR_LISP ("system-type", &Vsystem_type
,
1016 "Value is symbol indicating type of operating system you are using.");
1017 Vsystem_type
= intern (SYSTEM_TYPE
);
1019 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
1020 "Value is string indicating configuration Emacs was built for.");
1021 Vsystem_configuration
= build_string (CONFIGURATION
);
1023 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
1024 "Non-nil means Emacs is running without interactive terminal.");
1026 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
1027 "Hook to be run whenever kill-emacs is called.\n\
1028 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1029 in other similar situations), functions placed on this hook should not\n\
1030 expect to be able to interact with the user.");
1031 Vkill_emacs_hook
= Qnil
;
1033 DEFVAR_INT ("emacs-priority", &emacs_priority
,
1034 "Priority for Emacs to run at.\n\
1035 This value is effective only if set before Emacs is dumped,\n\
1036 and only if the Emacs executable is installed with setuid to permit\n\
1037 it to change priority. (Emacs sets its uid back to the real uid.)");
1040 staticpro (&Vinstallation_directory
);
1041 Vinstallation_directory
= Qnil
;
1043 /* These have already been set, in init_cmdargs, so don't set them here. */
1044 staticpro (&Vinvocation_name
);
1045 staticpro (&Vinvocation_directory
);