emacs.c 73.2 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Fully extensible Emacs, running on Unix, intended for GNU.
2

3
Copyright (C) 1985-1987, 1993-1995, 1997-1999, 2001-2012
4
  Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
12 13 14 15 16 17 18

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
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
20 21


22
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
23 24 25 26 27 28
#include <signal.h>
#include <errno.h>
#include <stdio.h>

#include <sys/types.h>
#include <sys/file.h>
29
#include <setjmp.h>
30 31
#include <unistd.h>

32 33
#include "lisp.h"

34 35 36 37
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

38 39
#ifdef WINDOWSNT
#include <fcntl.h>
40 41
#include <windows.h> /* just for w32.h */
#include "w32.h"
42
#include "w32heap.h" /* for prototype of sbrk */
43 44
#endif

45 46 47 48 49
#ifdef NS_IMPL_GNUSTEP
/* At least under Debian, GSConfig is in a subdirectory.  --Stef  */
#include <GNUstepBase/GSConfig.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
50
#include "commands.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
51
#include "intervals.h"
52
#include "character.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
53
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
54
#include "window.h"
Jim Blandy's avatar
Jim Blandy committed
55

56
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
57
#include "blockinput.h"
58
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
59
#include "process.h"
60
#include "frame.h"
61
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
62
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
63
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
64

Ted Zlatanov's avatar
Ted Zlatanov committed
65 66 67 68
#ifdef HAVE_GNUTLS
#include "gnutls.h"
#endif

69 70 71 72 73 74
#if (defined PROFILING \
     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
# include <sys/gmon.h>
extern void moncontrol (int mode);
#endif

75 76 77 78
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

79 80 81 82 83
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

84 85 86 87
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
88 89 90 91
#ifndef O_RDWR
#define O_RDWR 2
#endif

92
static const char emacs_version[] = VERSION;
93
static const char emacs_copyright[] = "Copyright (C) 2012 Free Software Foundation, Inc.";
94

95 96
/* Empty lisp strings.  To avoid having to build any others.  */
Lisp_Object empty_unibyte_string, empty_multibyte_string;
Stefan Monnier's avatar
Stefan Monnier committed
97

98 99 100 101
/* Set after Emacs has started up the first time.
   Prevents reinitialization of the Lisp world and keymaps
   on subsequent starts.  */
bool initialized;
Jim Blandy's avatar
Jim Blandy committed
102

103 104 105 106
#ifdef DARWIN_OS
extern void unexec_init_emacs_zone (void);
#endif

107 108 109
#ifdef DOUG_LEA_MALLOC
/* Preserves a pointer to the memory allocated that copies that
   static data inside glibc's malloc.  */
110
static void *malloc_state_ptr;
111
/* From glibc, a routine that returns a copy of the malloc internal state.  */
112
extern void *malloc_get_state (void);
113
/* From glibc, a routine that overwrites the malloc internal state.  */
114
extern int malloc_set_state (void*);
115
/* True if the MALLOC_CHECK_ environment variable was set while
116
   dumping.  Used to work around a bug in glibc's malloc.  */
117
static bool malloc_using_checking;
118 119
#endif

120 121
Lisp_Object Qfile_name_handler_alist;

Glenn Morris's avatar
Glenn Morris committed
122 123
Lisp_Object Qrisky_local_variable;

124 125
Lisp_Object Qkill_emacs;

126
/* If true, Emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
127
   but instead should use the virtual terminal under which it was started.  */
128
bool inhibit_window_system;
Jim Blandy's avatar
Jim Blandy committed
129

130
/* If true, a filter or a sentinel is running.  Tested to save the match
Pavel Janík's avatar
Pavel Janík committed
131
   data on the first attempt to change it inside asynchronous code.  */
132
bool running_asynch_code;
133

Juanma Barranquero's avatar
Juanma Barranquero committed
134
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
135 136
/* If true, -d was specified, meaning we're using some window system.  */
bool display_arg;
Jim Blandy's avatar
Jim Blandy committed
137 138 139 140 141 142
#endif

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

143
#if defined (DOUG_LEA_MALLOC) || defined (GNU_LINUX)
144 145
/* The address where the heap starts (from the first sbrk (0) call).  */
static void *my_heap_start;
146
#endif
147

148
#ifdef GNU_LINUX
149
/* The gap between BSS end and heap start as far as we can tell.  */
150 151
static uprintmax_t heap_bss_diff;
#endif
152

153 154
/* True means running Emacs without interactive terminal.  */
bool noninteractive;
Jim Blandy's avatar
Jim Blandy committed
155

156 157
/* True means remove site-lisp directories from load-path.  */
bool no_site_lisp;
158

159 160
/* Name for the server started by the daemon.*/
static char *daemon_name;
161

162 163
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
164
int daemon_pipe[2];
165

166 167 168
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
169

170
static void sort_args (int argc, char **argv);
171
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
172

Kenichi Handa's avatar
Kenichi Handa committed
173 174
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
175
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
176 177 178 179 180 181
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\
182
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
183 184 185 186
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
187
--batch                     do not do interactive display; implies -q\n\
188
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
189
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
190 191 192 193 194 195
--debug-init                enable Emacs Lisp debugger for init file\n\
--display, -d DISPLAY       use X server DISPLAY\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\
196
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
197
--no-splash                 do not display a splash screen on startup\n\
198
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
199 200
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
Kenichi Handa's avatar
Kenichi Handa committed
201 202 203 204 205 206
--script FILE               run FILE as an Emacs Lisp script\n\
--terminal, -t DEVICE       use DEVICE for terminal I/O\n\
--user, -u USER             load ~USER/.emacs instead of your own\n\
\n%s"

#define USAGE2 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
207 208
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
209
FILE                    visit FILE using find-file\n\
210 211
+LINE                   go to line LINE in next FILE\n\
+LINE:COLUMN            go to line LINE, column COLUMN, in next FILE\n\
Kenichi Handa's avatar
Kenichi Handa committed
212 213 214 215 216 217 218 219 220 221
--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\
222 223
\n"

Kenichi Handa's avatar
Kenichi Handa committed
224
#define USAGE3 "\
225
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
226
\n\
Kenichi Handa's avatar
Kenichi Handa committed
227
--background-color, -bg COLOR   window background color\n\
228 229
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
230 231
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
232
--color, --color=MODE           override color mode for character terminals;\n\
233 234
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
235 236 237 238 239
                                  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\
240
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
241
--fullwidth, -fw                make the first frame wide as the screen\n\
242
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
243
--geometry, -g GEOMETRY         window geometry\n\
Jan Djärv's avatar
Jan Djärv committed
244
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
245 246 247 248 249
--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\
250
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
251 252 253 254
--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\
Jan Djärv's avatar
Jan Djärv committed
255
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
256 257
--help                          display this help and exit\n\
--version                       output version information and exit\n\
258 259 260
\n"

#define USAGE4 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
261 262 263 264 265 266
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\
267
\n\
268
Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
269 270
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
271

Pavel Janík's avatar
Pavel Janík committed
272
/* Signal code for the fatal signal that was received.  */
273
static int fatal_error_code;
Jim Blandy's avatar
Jim Blandy committed
274

275 276
/* True if handling a fatal error already.  */
bool fatal_error_in_progress;
Jim Blandy's avatar
Jim Blandy committed
277

278
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
279 280
/* When compiled with GTK and running under Gnome,
   multiple threads may be created.  Keep track of our main
281
   thread to make sure signals are delivered to it (see syssignal.h).  */
282 283 284 285

pthread_t main_thread;
#endif

286 287 288
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
289 290
#endif

291

292

Pavel Janík's avatar
Pavel Janík committed
293
/* Handle bus errors, invalid instruction, etc.  */
294 295 296
#ifndef FLOAT_CATCH_SIGILL
static
#endif
297
void
298
fatal_error_signal (int sig)
Jim Blandy's avatar
Jim Blandy committed
299
{
300
  SIGNAL_THREAD_CHECK (sig);
301 302 303 304 305 306 307 308
  fatal_error_backtrace (sig, 10);
}

/* Report a fatal error due to signal SIG, output a backtrace of at
   most BACKTRACE_LIMIT lines, and exit.  */
_Noreturn void
fatal_error_backtrace (int sig, int backtrace_limit)
{
Jim Blandy's avatar
Jim Blandy committed
309 310 311
  fatal_error_code = sig;
  signal (sig, SIG_DFL);

312 313
  TOTALLY_UNBLOCK_INPUT;

Jim Blandy's avatar
Jim Blandy committed
314
  /* If fatal error occurs in code below, avoid infinite recursion.  */
315 316 317
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
318

319
      if (sig == SIGTERM || sig == SIGHUP || sig == SIGINT)
320 321
        Fkill_emacs (make_number (sig));

322
      shut_down_emacs (sig, Qnil);
323
      emacs_backtrace (backtrace_limit);
324
    }
Jim Blandy's avatar
Jim Blandy committed
325

326 327 328 329
  /* 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.  */
330
#ifndef MSDOS
331
  sigunblock (sigmask (fatal_error_code));
332
#endif
333

Jim Blandy's avatar
Jim Blandy committed
334
  kill (getpid (), fatal_error_code);
335 336 337

  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Jim Blandy's avatar
Jim Blandy committed
338
}
339 340 341

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
342
/* Handler for SIGDANGER.  */
343
void
Andreas Schwab's avatar
Andreas Schwab committed
344
memory_warning_signal (int sig)
345 346
{
  signal (sig, memory_warning_signal);
347
  SIGNAL_THREAD_CHECK (sig);
348 349

  malloc_warning ("Operating system warns that virtual memory is running low.\n");
350 351 352

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
353 354
}
#endif
Jim Blandy's avatar
Jim Blandy committed
355

Pavel Janík's avatar
Pavel Janík committed
356
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
357

Andreas Schwab's avatar
Andreas Schwab committed
358
static void
359
init_cmdargs (int argc, char **argv, int skip_args)
Jim Blandy's avatar
Jim Blandy committed
360 361
{
  register int i;
362
  Lisp_Object name, dir, handler;
363
  ptrdiff_t count = SPECPDL_INDEX ();
364
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
365

366 367 368
  initial_argv = argv;
  initial_argc = argc;

369 370 371 372
  raw_name = build_string (argv[0]);

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
373 374
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
375 376 377 378 379
    raw_name = concat2 (build_string ("/:"), raw_name);

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

380 381 382 383 384 385
  /* 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,
386
		       Vexec_suffixes, &found, make_number (X_OK));
387
      if (yes == 1)
388 389 390
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
391 392
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
393 394 395
	    found = concat2 (build_string ("/:"), found);
	  Vinvocation_directory = Ffile_name_directory (found);
	}
396
    }
397

398 399
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
400 401
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
402 403
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

404 405 406 407 408
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
409 410 411 412 413 414 415 416 417 418
#ifdef WINDOWSNT
      /* If we are running from the build directory, set DIR to the
	 src subdirectory of the Emacs tree, like on Posix
	 platforms.  */
      if (SBYTES (dir) > sizeof ("/i386/") - 1
	  && 0 == strcmp (SSDATA (dir) + SBYTES (dir) - sizeof ("/i386/") + 1,
			  "/i386/"))
	dir = Fexpand_file_name (build_string ("../.."), dir);
#else  /* !WINDOWSNT */
#endif
419 420 421
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
422
	  Lisp_Object tem, lib_src_exists;
423 424
	  Lisp_Object etc_exists, info_exists;

425 426 427 428 429
	  /* 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);
430

431
#ifdef MSDOS
432 433 434 435 436
	  /* 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);
437 438 439
#else
	  info_exists = Qnil;
#endif
440 441

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
442
	    {
443 444 445
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
446
		{
447 448 449
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
450 451 452 453
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
454 455
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
456

457 458 459

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
460 461
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
462 463 464
#else
	  info_exists = Qnil;
#endif
465 466

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
467
	    {
468 469 470
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
471
		{
472 473 474 475
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
476 477 478 479 480 481 482 483
		}
	    }

	  /* 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))
	    {
484
	      name = Fexpand_file_name (tem, dir);
485 486 487 488 489 490 491
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
492 493 494 495 496
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
497 498 499
	/* For the moment, we keep arguments as is in unibyte strings.
	   They are decoded in the function command-line after we know
	   locale-coding-system.  */
Jim Blandy's avatar
Jim Blandy committed
500
	Vcommand_line_args
501
	  = Fcons (make_unibyte_string (argv[i], strlen (argv[i])),
502
		   Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
503
    }
504 505

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
506
}
507 508

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
509 510
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
511
  (void)
512 513 514 515
{
  return Fcopy_sequence (Vinvocation_name);
}

516
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
517 518
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
519
  (void)
520 521 522 523
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
524

525 526 527 528 529 530
#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

531
#ifndef ORDINARY_LINK
532 533 534 535 536
/* 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__
537 538 539

/* Define a dummy function F.  Declare F too, to pacify gcc
   -Wmissing-prototypes.  */
540
#define DEFINE_DUMMY_FUNCTION(f) \
541
  void f (void) ATTRIBUTE_CONST EXTERNALLY_VISIBLE; void f (void) {}
542

543
#ifndef GCC_CTORS_IN_LIBC
544 545 546
DEFINE_DUMMY_FUNCTION (__do_global_ctors)
DEFINE_DUMMY_FUNCTION (__do_global_ctors_aux)
DEFINE_DUMMY_FUNCTION (__do_global_dtors)
Richard M. Stallman's avatar
Richard M. Stallman committed
547
/* GNU/Linux has a bug in its library; avoid an error.  */
548
#ifndef GNU_LINUX
549
char * __CTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
550
#endif
551
char * __DTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
552
#endif /* GCC_CTORS_IN_LIBC */
553
DEFINE_DUMMY_FUNCTION (__main)
554
#endif /* __GNUC__ */
555
#endif /* ORDINARY_LINK */
556

Karl Heuer's avatar
Karl Heuer committed
557 558 559 560 561 562 563 564 565
/* 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.  */
566

567
static bool
568 569
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
570
{
571
  char *p = NULL;
572
  ptrdiff_t arglen;
573 574 575 576 577 578 579
  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
580 581 582 583 584 585 586 587 588 589 590 591 592
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
593
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
594
	    ? p - arg : strlen (arg));
595
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
    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;
    }
}

620
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
621

622 623 624 625 626
/* 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
627
malloc_initialize_hook (void)
628
{
629 630
  if (initialized)
    {
631 632 633
      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
634 635 636 637
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

638
	  for (p = environ; p && *p; p++)
639 640 641 642 643 644 645 646
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
647

648
      malloc_set_state (malloc_state_ptr);
649
#ifndef XMALLOC_OVERRUN_CHECK
650
      free (malloc_state_ptr);
651
#endif
652
    }
653
  else
654 655 656 657 658
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
659 660
}

661
void (*__malloc_initialize_hook) (void) EXTERNALLY_VISIBLE = malloc_initialize_hook;
662 663 664

#endif /* DOUG_LEA_MALLOC */

665

666 667
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
668
main (int argc, char **argv)
669
{
670
#if GC_MARK_STACK
671 672
  Lisp_Object dummy;
#endif
673
  char stack_bottom_variable;
674
  bool do_initial_setlocale;
675 676 677 678
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
679
  bool no_loadup = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
680
  char *junk = 0;
681
  char *dname_arg = 0;
682 683 684
#ifdef NS_IMPL_COCOA
  char dname_arg2[80];
#endif
685
  char *ch_to_dir;
686

687
#if GC_MARK_STACK
688 689 690
  stack_base = &dummy;
#endif

691 692 693 694 695
#if defined (USE_GTK) && defined (G_SLICE_ALWAYS_MALLOC)
  /* This is used by the Cygwin build.  */
  setenv ("G_SLICE", "always-malloc", 1);
#endif

696
#ifdef GNU_LINUX
697 698 699 700 701 702 703 704 705 706
  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);
    }
707
#endif
708

709 710 711 712 713
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

714 715
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
716 717 718 719
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

720
  sort_args (argc, argv);
721 722
  argc = 0;
  while (argv[argc]) argc++;
723

724
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
725
    {
726 727
      const char *version, *copyright;
      if (initialized)
728
	{
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
	  Lisp_Object tem, tem2;
	  tem = Fsymbol_value (intern_c_string ("emacs-version"));
	  tem2 = Fsymbol_value (intern_c_string ("emacs-copyright"));
	  if (!STRINGP (tem))
	    {
	      fprintf (stderr, "Invalid value of `emacs-version'\n");
	      exit (1);
	    }
	  if (!STRINGP (tem2))
	    {
	      fprintf (stderr, "Invalid value of `emacs-copyright'\n");
	      exit (1);
	    }
	  else
	    {
744 745
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
746
	    }
747
	}
748 749
      else
	{
750 751
	  version = emacs_version;
	  copyright = emacs_copyright;
752
	}
753 754 755 756 757 758 759 760
      printf ("GNU Emacs %s\n", version);
      printf ("%s\n", copyright);
      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, ");
      printf ("see the file named COPYING.\n");
      exit (0);
761
    }
762 763 764 765 766 767 768 769

  if (argmatch (argv, argc, "-chdir", "--chdir", 4, &ch_to_dir, &skip_args))
    if (chdir (ch_to_dir) == -1)
      {
	fprintf (stderr, "%s: Can't chdir to %s: %s\n",
		 argv[0], ch_to_dir, strerror (errno));
	exit (1);
      }
770

771

772 773 774 775
#ifdef HAVE_PERSONALITY_LINUX32
  if (!initialized
      && (strcmp (argv[argc-1], "dump") == 0
          || strcmp (argv[argc-1], "bootstrap") == 0)
776
      && ! getenv ("EMACS_HEAP_EXEC"))
777
    {
778
      static char heapexec[] = "EMACS_HEAP_EXEC=true";
779
      /* Set this so we only do this once.  */
Juanma Barranquero's avatar
Juanma Barranquero committed
780
      putenv (heapexec);
781

782 783
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
784
#define ADD_NO_RANDOMIZE 0x0040000
785
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
786 787
#undef  ADD_NO_RANDOMIZE

788
      execvp (argv[0], argv);
789

790 791
      /* If the exec fails, try to dump anyway.  */
      perror ("execvp");
792 793 794
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

795
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
796 797 798 799 800 801 802 803
  /* 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))
804
    {
805
      long newlim;
806
      extern size_t re_max_failures;
807 808 809 810 811 812 813 814
      /* 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;
815 816 817 818 819
#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.  */
Juanma Barranquero's avatar
Juanma Barranquero committed
820
      newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize ();
821
#endif
822
      if (newlim > rlim.rlim_max)
823 824
	{
	  newlim = rlim.rlim_max;
825 826
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
827
	}
828 829 830
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

831 832
      setrlimit (RLIMIT_STACK, &rlim);
    }
833
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
834

Jim Blandy's avatar
Jim Blandy committed
835 836 837 838
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
839

Jim Blandy's avatar
Jim Blandy committed
840
#ifndef SYSTEM_MALLOC
841 842
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
843

844 845 846
  /* Call malloc at least once, to run the initial __malloc_hook.
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
847

848
# ifndef SYNC_INPUT
849 850
  /* Arrange to disable interrupt input inside malloc etc.  */
  uninterrupt_malloc ();
851
# endif /* not SYNC_INPUT */
Jim Blandy's avatar
Jim Blandy committed
852 853
#endif	/* not SYSTEM_MALLOC */

854
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
855
  main_thread = pthread_self ();
856
#endif /* FORWARD_SIGNAL_TO_MAIN_THREAD */
857

858
#if defined (MSDOS) || defined (WINDOWSNT)
859 860 861
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
862
#endif /* MSDOS || WINDOWSNT */
863

864
#ifdef MSDOS
865 866 867 868 869 870 871
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
872 873
#endif /* MSDOS */

874 875 876 877 878 879 880 881 882 883 884 885 886 887
  /* 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, "");

Jim Blandy's avatar
Jim Blandy committed
888 889
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
890
  /* Handle the -t switch, which specifies filename to use as terminal.  */
891 892 893 894 895 896
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
897 898 899
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
900
	  if (result < 0 || dup (0) < 0)
901 902
	    {
	      char *errstring = strerror (errno);
903
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
904 905 906 907
	      exit (1);
	    }
	  if (! isatty (0))
	    {
908
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
909 910 911
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
912
#ifdef HAVE_WINDOW_SYSTEM
913
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
914
#endif
915 916 917 918 919
	}
      else
	break;
    }

920
  /* Command line option --no-windows is deprecated and thus not mentioned
Paul Eggert's avatar
Paul Eggert committed
921
     in the manual and usage information.  */
922 923
  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
924
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
925

Karl Heuer's avatar
Karl Heuer committed
926
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
927
  noninteractive = 0;
928
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
929 930 931 932
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
933 934 935
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
Glenn Morris's avatar
Glenn Morris committed
936
      /* Convert --script to -scriptload, un-skip it, and sort again
937
	 so that it will be handled in proper sequence.  */
938
      /* FIXME broken for --script=FILE - is that supposed to work?  */
939
      argv[skip_args - 1] = (char *) "-scriptload";
Richard M. Stallman's avatar
Richard M. Stallman committed
940 941 942
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
943

Pavel Janík's avatar
Pavel Janík committed
944
  /* Handle the --help option, which gives a usage message.  */
945
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
946
    {