emacs.c 68 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Fully extensible Emacs, running on Unix, intended for GNU.
2
   Copyright (C) 1985,86,87,93,94,95,97,98,1999,2001,02,03,2004
3
      Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
9
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
Richard M. Stallman's avatar
Richard M. Stallman committed
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
21 22


23
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
24 25 26 27 28 29 30 31 32 33 34
#include <signal.h>
#include <errno.h>
#include <stdio.h>

#include <sys/types.h>
#include <sys/file.h>

#ifdef VMS
#include <ssdef.h>
#endif

35 36 37 38
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

39
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
40 41 42
#include <sys/ioctl.h>
#endif

43 44 45 46
#ifdef WINDOWSNT
#include <fcntl.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
47 48
#include "lisp.h"
#include "commands.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
49
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
50
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
51
#include "window.h"
Jim Blandy's avatar
Jim Blandy committed
52

53
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
54
#include "blockinput.h"
55
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
56
#include "process.h"
57
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
58
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
59
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
60

61 62 63 64
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

65 66 67 68 69
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

70 71 72 73
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
74 75 76 77
#ifndef O_RDWR
#define O_RDWR 2
#endif

78
#ifdef HAVE_SETPGID
79
#if !defined (USG) || defined (BSD_PGRPS)
80
#undef setpgrp
81 82
#define setpgrp setpgid
#endif
83
#endif
84

85 86
extern void malloc_warning P_ ((char *));
extern void set_time_zone_rule P_ ((char *));
Gerd Moellmann's avatar
Gerd Moellmann committed
87 88 89
#ifdef HAVE_INDEX
extern char *index P_ ((const char *, int));
#endif
90

91 92
/* Make these values available in GDB, which doesn't see macros.  */

93 94 95 96 97 98 99 100 101 102
#ifdef USE_LSB_TAG
int gdb_use_lsb = 1;
#else
int gdb_use_lsb = 0;
#endif
#ifdef NO_UNION_TYPE
int gdb_use_union = 0;
#else
int gdb_use_union = 1;
#endif
103 104 105 106 107
EMACS_INT gdb_valbits = VALBITS;
EMACS_INT gdb_gctypebits = GCTYPEBITS;
#ifdef DATA_SEG_BITS
EMACS_INT gdb_data_seg_bits = DATA_SEG_BITS;
#else
108
EMACS_INT gdb_data_seg_bits = 0;
109
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
110
EMACS_INT PVEC_FLAG = PSEUDOVECTOR_FLAG;
111
EMACS_INT gdb_array_mark_flag = ARRAY_MARK_FLAG;
112

Pavel Janík's avatar
Pavel Janík committed
113
/* Command line args from shell, as list of strings.  */
Jim Blandy's avatar
Jim Blandy committed
114 115
Lisp_Object Vcommand_line_args;

116 117 118 119
/* The name under which Emacs was invoked, with any leading directory
   names discarded.  */
Lisp_Object Vinvocation_name;

120 121 122
/* The directory name from which Emacs was invoked.  */
Lisp_Object Vinvocation_directory;

123 124 125 126
/* The directory name in which to find subdirs such as lisp and etc.
   nil means get them only from PATH_LOADSEARCH.  */
Lisp_Object Vinstallation_directory;

Jim Blandy's avatar
Jim Blandy committed
127 128 129
/* Hook run by `kill-emacs' before it does really anything.  */
Lisp_Object Vkill_emacs_hook;

Stefan Monnier's avatar
Stefan Monnier committed
130 131 132
/* An empty lisp string.  To avoid having to build any other.  */
Lisp_Object empty_string;

133 134 135
/* Search path separator.  */
Lisp_Object Vpath_separator;

Jim Blandy's avatar
Jim Blandy committed
136 137 138 139 140
/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

141 142 143 144 145 146 147 148
#ifdef DOUG_LEA_MALLOC
/* Preserves a pointer to the memory allocated that copies that
   static data inside glibc's malloc.  */
void *malloc_state_ptr;
/* From glibc, a routine that returns a copy of the malloc internal state.  */
extern void *malloc_get_state ();
/* From glibc, a routine that overwrites the malloc internal state.  */
extern void malloc_set_state ();
149 150 151
/* Non-zero if the MALLOC_CHECK_ enviroment variable was set while
   dumping.  Used to work around a bug in glibc's malloc.  */
int malloc_using_checking;
152 153
#endif

154
/* Variable whose value is symbol giving operating system type.  */
Jim Blandy's avatar
Jim Blandy committed
155
Lisp_Object Vsystem_type;
156 157 158

/* Variable whose value is string giving configuration built for.  */
Lisp_Object Vsystem_configuration;
159 160 161 162 163

/* Variable whose value is string giving configuration options,
   for use when reporting bugs.  */
Lisp_Object Vsystem_configuration_options;

164 165
Lisp_Object Qfile_name_handler_alist;

166
/* Current and previous system locales for messages and time.  */
167 168 169 170
Lisp_Object Vsystem_messages_locale;
Lisp_Object Vprevious_system_messages_locale;
Lisp_Object Vsystem_time_locale;
Lisp_Object Vprevious_system_time_locale;
171

Juanma Barranquero's avatar
Juanma Barranquero committed
172
/* If non-zero, emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
173
   but instead should use the virtual terminal under which it was started.  */
Jim Blandy's avatar
Jim Blandy committed
174 175
int inhibit_window_system;

176 177
/* If nonzero, set Emacs to run at this priority.  This is also used
   in child_setup and sys_suspend to make sure subshells run at normal
Pavel Janík's avatar
Pavel Janík committed
178
   priority; those functions have their own extern declaration.  */
179
EMACS_INT emacs_priority;
180

Pavel Janík's avatar
Pavel Janík committed
181 182
/* If non-zero, a filter or a sentinel is running.  Tested to save the match
   data on the first attempt to change it inside asynchronous code.  */
183 184
int running_asynch_code;

185
#ifdef BSD_PGRPS
186 187 188 189
/* See sysdep.c.  */
extern int inherited_pgroup;
#endif

Jim Blandy's avatar
Jim Blandy committed
190
#ifdef HAVE_X_WINDOWS
Pavel Janík's avatar
Pavel Janík committed
191
/* If non-zero, -d was specified, meaning we're using some window system.  */
Jim Blandy's avatar
Jim Blandy committed
192 193 194 195 196 197 198
int display_arg;
#endif

/* An address near the bottom of the stack.
   Tells GC how to save a copy of the stack.  */
char *stack_bottom;

199 200 201 202 203 204 205 206 207 208 209
/* The address where the heap starts (from the first sbrk (0) call).  */
static void *my_heap_start;

/* The gap between BSS end and heap start as far as we can tell.  */
static unsigned long heap_bss_diff;

/* If the gap between BSS end and heap start is larger than this we try to
   work around it, and if that fails, output a warning in dump-emacs.  */
#define MAX_HEAP_BSS_DIFF (1024*1024)


210
#ifdef HAVE_WINDOW_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
211
extern Lisp_Object Vwindow_system;
212
#endif /* HAVE_WINDOW_SYSTEM */
Jim Blandy's avatar
Jim Blandy committed
213

214 215
extern Lisp_Object Vauto_save_list_file_name;

216 217
extern Lisp_Object Vinhibit_redisplay;

Jim Blandy's avatar
Jim Blandy committed
218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
#ifdef USG_SHARED_LIBRARIES
/* If nonzero, this is the place to put the end of the writable segment
   at startup.  */

unsigned int bss_end = 0;
#endif

/* Nonzero means running Emacs without interactive terminal.  */

int noninteractive;

/* Value of Lisp variable `noninteractive'.
   Normally same as C variable `noninteractive'
   but nothing terrible happens if user sets this one.  */

int noninteractive1;
234 235 236 237

/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
238 239

static void sort_args ();
Andreas Schwab's avatar
Andreas Schwab committed
240
void syms_of_emacs ();
Gerd Moellmann's avatar
Gerd Moellmann committed
241

242 243
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
244
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
245 246 247 248 249 250 251 252 253 254 255
Usage: %s [OPTION-OR-FILENAME]...\n\
\n\
Run Emacs, the extensible, customizable, self-documenting real-time\n\
display editor.  The recommended way to start Emacs for normal editing\n\
is with no options at all.\n\
\n\
Run M-x info RET m emacs RET m command arguments RET inside Emacs to\n\
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
256 257 258 259 260 261 262 263 264 265 266 267
--batch                     do not do interactive display; implies -q\n\
--debug-init                enable Emacs Lisp debugger for init file\n\
--display, -d DISPLAY       use X server DISPLAY\n\
--multibyte, --no-unibyte   inhibit the effect of EMACS_UNIBYTE\n\
--no-desktop                do not load a saved desktop\n\
--no-init-file, -q          load neither ~/.emacs nor default.el\n\
--no-shared-memory, -nl     do not use shared memory\n\
--no-site-file              do not load site-start.el\n\
--no-splash                 do not display a splash screen on startup\n\
--no-window-system, -nw     don't communicate with X, ignoring $DISPLAY\n\
--script FILE               run FILE as an Emacs Lisp script\n\
--terminal, -t DEVICE       use DEVICE for terminal I/O\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
268
--unibyte, --no-multibyte   run Emacs in unibyte mode\n\
269
--user, -u USER             load ~USER/.emacs instead of your own\n\
270 271 272
\n%s"

#define USAGE2 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
273 274
Action options:\n\
\n\
275 276 277 278 279 280 281 282 283 284 285 286 287 288
FILE                    visit FILE using find-file\n\
+LINE FILE              visit FILE using find-file, then go to line LINE\n\
+LINE:COLUMN FILE       visit FILE using find-file, then go to line LINE,\n\
                          column COLUMN\n\
--directory, -L DIR     add DIR to variable load-path\n\
--eval EXPR             evaluate Emacs Lisp expression EXPR\n\
--execute EXPR          evaluate Emacs Lisp expression EXPR\n\
--file FILE             visit FILE using find-file\n\
--find-file FILE        visit FILE using find-file\n\
--funcall, -f FUNC      call Emacs Lisp function FUNC with no arguments\n\
--insert FILE           insert contents of FILE into current buffer\n\
--kill                  exit without asking for confirmation\n\
--load, -l FILE         load Emacs Lisp FILE using the load function\n\
--visit FILE            visit FILE using find-file\n\
289 290
\n"

291
#define USAGE3 "\
292
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
293
\n\
294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
--background-color, -bg COLOR   window background color\n\
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
--color MODE                    color mode for character terminals;\n\
                                  MODE defaults to `auto', and can also\n\
                                  be `never', `auto', `always',\n\
                                  or a mode name like `ansi8'\n\
--cursor-color, -cr COLOR       color of the Emacs cursor indicating point\n\
--font, -fn FONT                default font; must be fixed-width\n\
--foreground-color, -fg COLOR   window foreground color\n\
--fullheight, -fh               make the first frame high as the screen\n\
--fullscreen, -fs               make first frame fullscreen\n\
--fullwidth, -fw                make the first frame wide as the screen\n\
--geometry, -g GEOMETRY         window geometry\n\
--horizontal-scroll-bars, -hb   enable horizontal scroll bars\n\
--icon-type, -i                 use picture of gnu for Emacs icon\n\
--iconic                        start Emacs in iconified state\n\
--internal-border, -ib WIDTH    width between text and main border\n\
--line-spacing, -lsp PIXELS     additional space to put between lines\n\
--mouse-color, -ms COLOR        mouse cursor color in Emacs window\n\
--name NAME                     title for initial Emacs frame\n\
--reverse-video, -r, -rv        switch foreground and background\n\
--title, -T TITLE               title for initial Emacs frame\n\
--vertical-scroll-bars, -vb     enable vertical scroll bars\n\
--xrm XRESOURCES                set additional X resources\n\
--help                          display this help and exit\n\
--version                       output version information and exit\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
321 322 323 324 325 326 327
\n\
You can generally also specify long option names with a single -; for\n\
example, -batch as well as --batch.  You can use any unambiguous\n\
abbreviation for a --option.\n\
\n\
Various environment variables and window system resources also affect\n\
Emacs' operation.  See the main documentation.\n\
328 329
\n"

330
#define USAGE4 "\
331
Report bugs to %s.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
332 333
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
334

Pavel Janík's avatar
Pavel Janík committed
335
/* Signal code for the fatal signal that was received.  */
Jim Blandy's avatar
Jim Blandy committed
336 337
int fatal_error_code;

Pavel Janík's avatar
Pavel Janík committed
338
/* Nonzero if handling a fatal error already.  */
Jim Blandy's avatar
Jim Blandy committed
339 340
int fatal_error_in_progress;

Pavel Janík's avatar
Pavel Janík committed
341
/* If non-null, call this function from fatal_error_signal before
342 343 344 345 346
   committing suicide.  */

void (*fatal_error_signal_hook) P_ ((void));


347 348 349 350 351
#ifdef SIGUSR1
SIGTYPE
handle_USR1_signal (sig)
     int sig;
{
352 353
  struct input_event buf;

354
  bzero (&buf, sizeof buf);
355
  buf.kind = USER_SIGNAL_EVENT;
356
  buf.frame_or_window = selected_frame;
357 358

  kbd_buffer_store_event (&buf);
359
}
360
#endif /* SIGUSR1 */
Richard M. Stallman's avatar
Richard M. Stallman committed
361

362 363 364 365 366
#ifdef SIGUSR2
SIGTYPE
handle_USR2_signal (sig)
     int sig;
{
367 368
  struct input_event buf;

369
  bzero (&buf, sizeof buf);
370
  buf.kind = USER_SIGNAL_EVENT;
371
  buf.code = 1;
372
  buf.frame_or_window = selected_frame;
373 374

  kbd_buffer_store_event (&buf);
375
}
376
#endif /* SIGUSR2 */
377

Pavel Janík's avatar
Pavel Janík committed
378
/* Handle bus errors, invalid instruction, etc.  */
Jim Blandy's avatar
Jim Blandy committed
379
SIGTYPE
Jim Blandy's avatar
Jim Blandy committed
380 381 382 383 384 385
fatal_error_signal (sig)
     int sig;
{
  fatal_error_code = sig;
  signal (sig, SIG_DFL);

386 387
  TOTALLY_UNBLOCK_INPUT;

Jim Blandy's avatar
Jim Blandy committed
388
  /* If fatal error occurs in code below, avoid infinite recursion.  */
389 390 391
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
392

393
      shut_down_emacs (sig, 0, Qnil);
394
    }
Jim Blandy's avatar
Jim Blandy committed
395 396 397 398

#ifdef VMS
  LIB$STOP (SS$_ABORT);
#else
399 400 401 402
  /* Signal the same code; this time it will really be fatal.
     Remember that since we're in a signal handler, the signal we're
     going to send is probably blocked, so we have to unblock it if we
     want to really receive it.  */
403
#ifndef MSDOS
404
  sigunblock (sigmask (fatal_error_code));
405
#endif
406 407 408

  if (fatal_error_signal_hook)
    fatal_error_signal_hook ();
Pavel Janík's avatar
Pavel Janík committed
409

Jim Blandy's avatar
Jim Blandy committed
410 411 412
  kill (getpid (), fatal_error_code);
#endif /* not VMS */
}
413 414 415

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
416
/* Handler for SIGDANGER.  */
417 418 419 420 421 422 423
SIGTYPE
memory_warning_signal (sig)
     int sig;
{
  signal (sig, memory_warning_signal);

  malloc_warning ("Operating system warns that virtual memory is running low.\n");
424 425 426

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
427 428
}
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
429 430

/* We define abort, rather than using it from the library,
Karl Heuer's avatar
Karl Heuer committed
431
   so that GDB can return from a breakpoint here.
Pavel Janík's avatar
Pavel Janík committed
432
   MSDOS has its own definition in msdos.c.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
433

434
#if ! defined (DOS_NT) && ! defined (NO_ABORT)
435 436 437 438 439 440

#ifndef ABORT_RETURN_TYPE
#define ABORT_RETURN_TYPE void
#endif

ABORT_RETURN_TYPE
Richard M. Stallman's avatar
Richard M. Stallman committed
441 442 443
abort ()
{
  kill (getpid (), SIGABRT);
444 445
  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Richard M. Stallman's avatar
Richard M. Stallman committed
446
}
Karl Heuer's avatar
Karl Heuer committed
447
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
448

Jim Blandy's avatar
Jim Blandy committed
449

Pavel Janík's avatar
Pavel Janík committed
450
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
451

Andreas Schwab's avatar
Andreas Schwab committed
452
static void
Jim Blandy's avatar
Jim Blandy committed
453 454 455 456 457 458
init_cmdargs (argc, argv, skip_args)
     int argc;
     char **argv;
     int skip_args;
{
  register int i;
459
  Lisp_Object name, dir, tem;
Juanma Barranquero's avatar
Juanma Barranquero committed
460
  int count = SPECPDL_INDEX ();
461
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
462

463 464 465
  initial_argv = argv;
  initial_argc = argc;

466 467 468 469 470 471 472 473 474 475 476
  raw_name = build_string (argv[0]);

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
  tem = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (tem))
    raw_name = concat2 (build_string ("/:"), raw_name);

  Vinvocation_name = Ffile_name_nondirectory (raw_name);
  Vinvocation_directory = Ffile_name_directory (raw_name);

477 478 479 480 481 482
  /* If we got no directory in argv[0], search PATH to find where
     Emacs actually came from.  */
  if (NILP (Vinvocation_directory))
    {
      Lisp_Object found;
      int yes = openp (Vexec_path, Vinvocation_name,
483
		       Vexec_suffixes, &found, make_number (X_OK));
484
      if (yes == 1)
485 486 487 488 489 490 491 492
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
	  tem = Ffind_file_name_handler (found, Qt);
	  if (! NILP (tem))
	    found = concat2 (build_string ("/:"), found);
	  Vinvocation_directory = Ffile_name_directory (found);
	}
493
    }
494

495 496
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
497 498
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
499 500
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

501 502 503 504 505 506 507 508
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
509
	  Lisp_Object tem, lib_src_exists;
510 511
	  Lisp_Object etc_exists, info_exists;

512 513 514 515 516
	  /* See if dir contains subdirs for use by Emacs.
	     Check for the ones that would exist in a build directory,
	     not including lisp and info.  */
	  tem = Fexpand_file_name (build_string ("lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
517

518
#ifdef MSDOS
519 520 521 522 523
	  /* MSDOS installations frequently remove lib-src, but we still
	     must set installation-directory, or else info won't find
	     its files (it uses the value of installation-directory).  */
	  tem = Fexpand_file_name (build_string ("info"), dir);
	  info_exists = Ffile_exists_p (tem);
524 525 526
#else
	  info_exists = Qnil;
#endif
527 528

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
529
	    {
530 531 532
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
533
		{
534 535 536
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
537 538 539 540
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
541 542
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
543

544 545 546

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
547 548
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
549 550 551
#else
	  info_exists = Qnil;
#endif
552 553

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
554
	    {
555 556 557
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
558
		{
559 560 561 562
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
563 564 565 566 567 568 569 570
		}
	    }

	  /* If the Emacs executable is actually a link,
	     next try the dir that the link points into.  */
	  tem = Ffile_symlink_p (name);
	  if (!NILP (tem))
	    {
571
	      name = Fexpand_file_name (tem, dir);
572 573 574 575 576 577 578
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
579 580 581 582 583 584 585 586
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
	Vcommand_line_args
	  = Fcons (build_string (argv[i]), Vcommand_line_args);
    }
587 588

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
589
}
590 591

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
592 593 594
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
     ()
595 596 597 598
{
  return Fcopy_sequence (Vinvocation_name);
}

599
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
600 601 602
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
     ()
603 604 605 606
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
607 608 609

#ifdef VMS
#ifdef LINK_CRTL_SHARE
610
#ifdef SHARABLE_LIB_BUG
Jim Blandy's avatar
Jim Blandy committed
611
extern noshare char **environ;
612
#endif /* SHARABLE_LIB_BUG */
Jim Blandy's avatar
Jim Blandy committed
613 614 615
#endif /* LINK_CRTL_SHARE */
#endif /* VMS */

616 617 618 619 620 621
#ifdef HAVE_TZSET
/* A valid but unlikely value for the TZ environment value.
   It is OK (though a bit slower) if the user actually chooses this value.  */
static char dump_tz[] = "UtC0";
#endif

622
#ifndef ORDINARY_LINK
623 624 625 626 627
/* We don't include crtbegin.o and crtend.o in the link,
   so these functions and variables might be missed.
   Provide dummy definitions to avoid error.
   (We don't have any real constructors or destructors.)  */
#ifdef __GNUC__
628
#ifndef GCC_CTORS_IN_LIBC
Andreas Schwab's avatar
Andreas Schwab committed
629
void __do_global_ctors ()
630
{}
Andreas Schwab's avatar
Andreas Schwab committed
631
void __do_global_ctors_aux ()
632
{}
Andreas Schwab's avatar
Andreas Schwab committed
633
void __do_global_dtors ()
634
{}
Richard M. Stallman's avatar
Richard M. Stallman committed
635
/* GNU/Linux has a bug in its library; avoid an error.  */
636
#ifndef GNU_LINUX
637
char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
638
#endif
639
char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
640
#endif /* GCC_CTORS_IN_LIBC */
Andreas Schwab's avatar
Andreas Schwab committed
641
void __main ()
642 643
{}
#endif /* __GNUC__ */
644
#endif /* ORDINARY_LINK */
645

Karl Heuer's avatar
Karl Heuer committed
646 647 648 649 650 651 652 653 654
/* Test whether the next argument in ARGV matches SSTR or a prefix of
   LSTR (at least MINLEN characters).  If so, then if VALPTR is non-null
   (the argument is supposed to have a value) store in *VALPTR either
   the next argument or the portion of this one after the equal sign.
   ARGV is read starting at position *SKIPPTR; this index is advanced
   by the number of arguments used.

   Too bad we can't just use getopt for all of this, but we don't have
   enough information to do it right.  */
655

Karl Heuer's avatar
Karl Heuer committed
656
static int
657
argmatch (argv, argc, sstr, lstr, minlen, valptr, skipptr)
Karl Heuer's avatar
Karl Heuer committed
658
     char **argv;
659
     int argc;
Karl Heuer's avatar
Karl Heuer committed
660 661 662 663 664 665
     char *sstr;
     char *lstr;
     int minlen;
     char **valptr;
     int *skipptr;
{
666
  char *p = NULL;
Karl Heuer's avatar
Karl Heuer committed
667
  int arglen;
668 669 670 671 672 673 674
  char *arg;

  /* Don't access argv[argc]; give up in advance.  */
  if (argc <= *skipptr + 1)
    return 0;

  arg = argv[*skipptr+1];
Karl Heuer's avatar
Karl Heuer committed
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
  arglen = (valptr != NULL && (p = index (arg, '=')) != NULL
	    ? p - arg : strlen (arg));
690
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
    return 0;
  else if (valptr == NULL)
    {
      *skipptr += 1;
      return 1;
    }
  else if (p != NULL)
    {
      *valptr = p+1;
      *skipptr += 1;
      return 1;
    }
  else if (argv[*skipptr+2] != NULL)
    {
      *valptr = argv[*skipptr+2];
      *skipptr += 2;
      return 1;
    }
  else
    {
      return 0;
    }
}

715
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
716

717 718 719 720 721 722 723
/* malloc can be invoked even before main (e.g. by the dynamic
   linker), so the dumped malloc state must be restored as early as
   possible using this special hook.  */

static void
malloc_initialize_hook ()
{
724
#ifndef USE_CRT_DLL
725
  extern char **environ;
726
#endif
727

728 729
  if (initialized)
    {
730 731 732
      if (!malloc_using_checking)
	/* Work around a bug in glibc's malloc.  MALLOC_CHECK_ must be
	   ignored if the heap to be restored was constructed without
733 734 735 736
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

737
	  for (p = environ; p && *p; p++)
738 739 740 741 742 743 744 745
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
746

747 748 749
      malloc_set_state (malloc_state_ptr);
      free (malloc_state_ptr);
    }
750
  else
751 752 753 754 755
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
756 757 758 759 760 761
}

void (*__malloc_initialize_hook) () = malloc_initialize_hook;

#endif /* DOUG_LEA_MALLOC */

762 763 764 765 766 767 768

#define REPORT_EMACS_BUG_ADDRESS "bug-gnu-emacs@gnu.org"
#define REPORT_EMACS_BUG_PRETEST_ADDRESS "emacs-pretest-bug@gnu.org"

/* This function is used to determine an address to which bug report should
   be sent.  */

769 770
char *
bug_reporting_address ()
771
{
772
  int count = 0;
773 774 775 776 777 778 779 780 781
  Lisp_Object temp;
  char *string;

  temp = Fsymbol_value (intern ("emacs-version"));

  /* When `emacs-version' is invalid, use normal address.  */
  if (!STRINGP(temp))
    return REPORT_EMACS_BUG_ADDRESS;

782
  string = SDATA (temp);
783

784 785 786 787 788 789 790
  /* Count dots in `emacs-version'.  */
  while (*string)
    {
      if (*string == '.')
	count++;
      string++;
    }
791 792 793

  /* When `emacs-version' has at least three dots, it is development or
     pretest version of Emacs.  */
794
  return count >= 3 ? REPORT_EMACS_BUG_PRETEST_ADDRESS : REPORT_EMACS_BUG_ADDRESS;
795 796 797
}


798 799
/* ARGSUSED */
int
Dave Love's avatar
Dave Love committed
800 801 802 803 804
main (argc, argv
#ifdef VMS
, envp
#endif
)
805 806
     int argc;
     char **argv;
Dave Love's avatar
Dave Love committed
807
#ifdef VMS
808
     char **envp;
Dave Love's avatar
Dave Love committed
809
#endif
810
{
811
#if GC_MARK_STACK
812 813
  Lisp_Object dummy;
#endif
814
  char stack_bottom_variable;
815
  int do_initial_setlocale;
816
  int skip_args = 0;
817
#ifndef USE_CRT_DLL
818
  extern int errno;
819
#endif
820 821 822 823
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
  int no_loadup = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
824
  char *junk = 0;
825

826
#if GC_MARK_STACK
827 828 829 830
  extern Lisp_Object *stack_base;
  stack_base = &dummy;
#endif

831 832 833 834 835 836 837 838 839 840 841
  if (!initialized)
    {
      extern char my_endbss[];
      extern char *my_endbss_static;

      if (my_heap_start == 0)
        my_heap_start = sbrk (0);

      heap_bss_diff = (char *)my_heap_start - max (my_endbss, my_endbss_static);
    }

842 843
#ifdef LINUX_SBRK_BUG
  __sbrk (1);
844 845
#endif

846 847 848 849 850
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

851
#ifdef MAC_OSX
852 853 854 855
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

856
  sort_args (argc, argv);
857 858
  argc = 0;
  while (argv[argc]) argc++;
859

860 861 862 863
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args)
      /* We don't know the version number unless this is a dumped Emacs.
         So ignore --version otherwise.  */
      && initialized)
864 865 866 867 868 869 870 871 872 873
    {
      Lisp_Object tem;
      tem = Fsymbol_value (intern ("emacs-version"));
      if (!STRINGP (tem))
	{
	  fprintf (stderr, "Invalid value of `emacs-version'\n");
	  exit (1);
	}
      else
	{
874
	  printf ("GNU Emacs %s\n", SDATA (tem));
875
	  printf ("Copyright (C) 2004 Free Software Foundation, Inc.\n");
876 877 878 879
	  printf ("GNU Emacs comes with ABSOLUTELY NO WARRANTY.\n");
	  printf ("You may redistribute copies of Emacs\n");
	  printf ("under the terms of the GNU General Public License.\n");
	  printf ("For more information about these matters, ");
Karl Heuer's avatar
Karl Heuer committed
880
	  printf ("see the file named COPYING.\n");
881 882 883 884
	  exit (0);
	}
    }

885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906
#ifdef HAVE_PERSONALITY_LINUX32
  /* See if there is a gap between the end of BSS and the heap.
     In that case, set personality and exec ourself again.  */
  if (!initialized
      && (strcmp (argv[argc-1], "dump") == 0
          || strcmp (argv[argc-1], "bootstrap") == 0)
      && heap_bss_diff > MAX_HEAP_BSS_DIFF)
    {
      if (! getenv ("EMACS_HEAP_EXEC"))
        {
          /* Set this so we only do this once.  */
          putenv("EMACS_HEAP_EXEC=true");
          personality (PER_LINUX32);
          execvp (argv[0], argv);

          /* If the exec fails, try to dump anyway.  */
          perror ("execvp");
        }
    }
#endif /* HAVE_PERSONALITY_LINUX32 */


Jim Blandy's avatar
Jim Blandy committed
907 908
/* Map in shared memory, if we are using that.  */
#ifdef HAVE_SHM
909
  if (argmatch (argv, argc, "-nl", "--no-shared-memory", 6, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
910 911 912 913 914 915 916 917 918 919 920 921 922
    {
      map_in_data (0);
      /* The shared memory was just restored, which clobbered this.  */
      skip_args = 1;
    }
  else
    {
      map_in_data (1);
      /* The shared memory was just restored, which clobbered this.  */
      skip_args = 0;
    }
#endif

923
#ifdef NeXT
924 925 926 927 928 929 930
  {
    extern int malloc_cookie;
    /* This helps out unexnext.c.  */
    if (initialized)
      if (malloc_jumpstart (malloc_cookie) != 0)
	printf ("malloc jumpstart failed!\n");
  }
931 932
#endif /* NeXT */

933 934 935 936 937 938 939
#ifdef MAC_OSX
  /* Skip process serial number passed in the form -psn_x_y as
     command-line argument.  */
  if (argc > skip_args + 1 && strncmp (argv[skip_args+1], "-psn_", 5) == 0)
    skip_args++;
#endif /* MAC_OSX */

Jim Blandy's avatar
Jim Blandy committed
940
#ifdef VMS
Pavel Janík's avatar
Pavel Janík committed
941
  /* If -map specified, map the data file in.  */
Karl Heuer's avatar
Karl Heuer committed
942 943
  {
    char *file;
Thien-Thi Nguyen's avatar
Thien-Thi Nguyen committed
944
    if (argmatch (argv, argc, "-map", "--map-data", 3, &file, &skip_args))
Karl Heuer's avatar
Karl Heuer committed
945 946
      mapin_data (file);
  }
Jim Blandy's avatar
Jim Blandy committed
947 948

#ifdef LINK_CRTL_SHARE
949
#ifdef SHARABLE_LIB_BUG
Pavel Janík's avatar
Pavel Janík committed
950
  /* Bletcherous shared libraries!  */
Jim Blandy's avatar
Jim Blandy committed
951 952 953 954 955 956 957 958
  if (!stdin)
    stdin = fdopen (0, "r");
  if (!stdout)
    stdout = fdopen (1, "w");
  if (!stderr)
    stderr = fdopen (2, "w");
  if (!environ)
    environ = envp;
959
#endif /* SHARABLE_LIB_BUG */
Jim Blandy's avatar
Jim Blandy committed
960 961 962
#endif /* LINK_CRTL_SHARE */
#endif /* VMS */

963
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
964 965 966 967 968 969 970 971
  /* Extend the stack space available.
     Don't do that if dumping, since some systems (e.g. DJGPP)
     might define a smaller stack limit at that time.  */
  if (1
#ifndef CANNOT_DUMP
      && (!noninteractive || initialized)
#endif
      && !getrlimit (RLIMIT_STACK, &rlim))
972
    {
973
      long newlim;
974
      extern int re_max_failures;
975 976 977 978 979 980 981 982
      /* Approximate the amount regex.c needs per unit of re_max_failures.  */
      int ratio = 20 * sizeof (char *);
      /* Then add 33% to cover the size of the smaller stacks that regex.c
	 successively allocates and discards, on its way to the maximum.  */
      ratio += ratio / 3;
      /* Add in some extra to cover
	 what we're likely to use for other reasons.  */
      newlim = re_max_failures * ratio + 200000;
983 984 985 986 987 988 989
#ifdef __NetBSD__
      /* NetBSD (at least NetBSD 1.2G and former) has a bug in its
       stack allocation routine for new process that the allocation
       fails if stack limit is not on page boundary.  So, round up the
       new limit to page boundary.  */
      newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize();
#endif
990
      if (newlim > rlim.rlim_max)
991 992
	{
	  newlim = rlim.rlim_max;
993 994
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
995
	}
996 997 998
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

999 1000
      setrlimit (RLIMIT_STACK, &rlim);
    }
1001
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
1002

Jim Blandy's avatar
Jim Blandy committed
1003 1004 1005 1006 1007
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

#ifdef USG_SHARED_LIBRARIES
  if (bss_end)
1008
    brk ((void *)bss_end);
Jim Blandy's avatar
Jim Blandy committed
1009 1010 1011
#endif

  clearerr (stdin);
1012

Jim Blandy's avatar
Jim Blandy committed
1013
#ifndef SYSTEM_MALLOC
1014 1015
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
1016

1017 1018 1019
  /* Call malloc at least once, to run the initial __malloc_hook.
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
1020 1021 1022

  /* Arrange to disable interrupt input inside malloc etc.  */
  uninterrupt_malloc ();
Jim Blandy's avatar
Jim Blandy committed
1023 1024
#endif	/* not SYSTEM_MALLOC */

1025
#if defined (MSDOS) || defined (WINDOWSNT)
1026 1027 1028
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
1029
#endif /* MSDOS || WINDOWSNT */
1030

1031
#ifdef MSDOS
1032 1033 1034 1035 1036 1037 1038 1039 1040
#if __DJGPP__ >= 2
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
#else  /* not __DJGPP__ >= 2 */
1041 1042 1043
  (stdin)->_flag &= ~_IOTEXT;
  (stdout)->_flag &= ~_IOTEXT;
  (stderr)->_flag &= ~_IOTEXT;
1044
#endif /* not __DJGPP__ >= 2 */
1045 1046
#endif /* MSDOS */

1047
#ifdef SET_EMACS_PRIORITY
1048
  if (emacs_priority)
1049
    nice (emacs_priority);
Jim Blandy's avatar
Jim Blandy committed
1050
  setuid (getuid ());
1051
#endif /* SET_EMACS_PRIORITY */
Jim Blandy's avatar
Jim Blandy committed
1052

1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
  /* Skip initial setlocale if LC_ALL is "C", as it's not needed in that case.
     The build procedure uses this while dumping, to ensure that the
     dumped Emacs does not have its system locale tables initialized,
     as that might cause screwups when the dumped Emacs starts up.  */
  {
    char *lc_all = getenv ("LC_ALL");
    do_initial_setlocale = ! lc_all || strcmp (lc_all, "C");
  }

  /* Set locale now, so that initial error messages are localized properly.
     fixup_locale must wait until later, since it builds strings.  */
  if (do_initial_setlocale)
    setlocale (LC_ALL, "");

1067
#ifdef EXTRA_INITIALIZE
1068
  EXTRA_INITIALIZE;
1069 1070
#endif

Jim Blandy's avatar
Jim Blandy committed
1071 1072
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
1073
  /* Handle the -t switch, which specifies filename to use as terminal.  */
1074 1075 1076 1077 1078 1079
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
1080 1081 1082
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
1083 1084 1085
	  if (result < 0)
	    {
	      char *errstring = strerror (errno);
1086
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
1087 1088 1089 1090 1091
	      exit (1);
	    }
	  dup (0);
	  if (! isatty (0))
	    {
1092
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
1093 1094 1095
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
1096
#ifdef HAVE_WINDOW_SYSTEM
1097
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
1098
#endif
1099 1100 1101 1102 1103
	}
      else
	break;
    }

1104 1105 1106 1107
  /* Command line option --no-windows is deprecated and thus not mentioned
     in the manual and usage informations.  */
  if (argmatch (argv, argc, "-nw", "--no-window-system", 6, NULL, &skip_args)
      || argmatch (argv, argc, "-nw", "--no-windows", 6, NULL, &skip_args))
Karl Heuer's avatar
Karl Heuer committed
1108
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
1109

Karl Heuer's avatar
Karl Heuer committed
1110
  /* Handle the -batch switch, which means don't do interactive display.  */