emacs.c 72.9 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Fully extensible Emacs, running on Unix, intended for GNU.
2
   Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1997, 1998, 1999,
3 4
                 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
                 2010  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>
Jim Blandy's avatar
Jim Blandy committed
30

31 32 33 34
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

35 36
#ifdef WINDOWSNT
#include <fcntl.h>
37 38
#include <windows.h> /* just for w32.h */
#include "w32.h"
39
#include "w32heap.h" /* for prototype of sbrk */
40 41
#endif

42 43 44 45 46
#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
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 "frame.h"
58
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
59
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
60
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
61

62 63 64 65
#ifdef HAVE_NS
#include "nsterm.h"
#endif

66 67 68 69
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

70 71 72 73 74
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

75 76 77 78
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
79 80 81 82
#ifndef O_RDWR
#define O_RDWR 2
#endif

83
#ifdef HAVE_SETPGID
Dan Nicolaescu's avatar
Dan Nicolaescu committed
84
#if !defined (USG)
85
#undef setpgrp
86 87
#define setpgrp setpgid
#endif
88
#endif
89

90 91
/* If you change the following line, remember to update
   msdos/mainmake.v2 which gleans the Emacs version from it!  */
Dan Nicolaescu's avatar
Dan Nicolaescu committed
92 93
static const char emacs_copyright[] = "Copyright (C) 2010 Free Software Foundation, Inc.";
static const char emacs_version[] = "24.0.50";
94

95 96
/* Make these values available in GDB, which doesn't see macros.  */

Kenichi Handa's avatar
Kenichi Handa committed
97 98 99 100 101
#ifdef USE_LSB_TAG
int gdb_use_lsb = 1;
#else
int gdb_use_lsb = 0;
#endif
Dan Nicolaescu's avatar
Dan Nicolaescu committed
102
#ifndef USE_LISP_UNION_TYPE
Kenichi Handa's avatar
Kenichi Handa committed
103 104 105 106
int gdb_use_union = 0;
#else
int gdb_use_union = 1;
#endif
107 108
EMACS_INT gdb_valbits = VALBITS;
EMACS_INT gdb_gctypebits = GCTYPEBITS;
109
#if defined (DATA_SEG_BITS) && ! defined (USE_LSB_TAG)
110 111
EMACS_INT gdb_data_seg_bits = DATA_SEG_BITS;
#else
112
EMACS_INT gdb_data_seg_bits = 0;
113
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
114
EMACS_INT PVEC_FLAG = PSEUDOVECTOR_FLAG;
115
EMACS_INT gdb_array_mark_flag = ARRAY_MARK_FLAG;
116 117 118
/* GDB might say "No enum type named pvec_type" if we don't have at
   least one symbol with that type, and then xbacktrace could fail.  */
enum pvec_type gdb_pvec_type = PVEC_TYPE_MASK;
119

Pavel Janík's avatar
Pavel Janík committed
120
/* Command line args from shell, as list of strings.  */
Jim Blandy's avatar
Jim Blandy committed
121 122
Lisp_Object Vcommand_line_args;

123 124 125 126
/* The name under which Emacs was invoked, with any leading directory
   names discarded.  */
Lisp_Object Vinvocation_name;

127 128 129
/* The directory name from which Emacs was invoked.  */
Lisp_Object Vinvocation_directory;

130 131 132 133
/* 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;

134 135 136
/* The values of `current-time' before and after Emacs initialization.  */
Lisp_Object Vbefore_init_time, Vafter_init_time;

Jim Blandy's avatar
Jim Blandy committed
137 138 139
/* Hook run by `kill-emacs' before it does really anything.  */
Lisp_Object Vkill_emacs_hook;

140 141
/* 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
142

143 144 145
/* Search path separator.  */
Lisp_Object Vpath_separator;

Jim Blandy's avatar
Jim Blandy committed
146 147 148 149 150
/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

151 152 153 154 155
#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.  */
156
extern void *malloc_get_state (void);
157
/* From glibc, a routine that overwrites the malloc internal state.  */
158
extern int malloc_set_state (void*);
159
/* Non-zero if the MALLOC_CHECK_ environment variable was set while
160 161
   dumping.  Used to work around a bug in glibc's malloc.  */
int malloc_using_checking;
162 163
#endif

164
/* Variable whose value is symbol giving operating system type.  */
Jim Blandy's avatar
Jim Blandy committed
165
Lisp_Object Vsystem_type;
166 167 168

/* Variable whose value is string giving configuration built for.  */
Lisp_Object Vsystem_configuration;
169 170 171 172 173

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

174 175
Lisp_Object Qfile_name_handler_alist;

176
/* Current and previous system locales for messages and time.  */
177 178 179 180
Lisp_Object Vsystem_messages_locale;
Lisp_Object Vprevious_system_messages_locale;
Lisp_Object Vsystem_time_locale;
Lisp_Object Vprevious_system_time_locale;
181

182 183 184 185
/* Copyright and version info.  The version number may be updated by
   Lisp code.  */
Lisp_Object Vemacs_copyright, Vemacs_version;

Juanma Barranquero's avatar
Juanma Barranquero committed
186
/* If non-zero, emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
187
   but instead should use the virtual terminal under which it was started.  */
Jim Blandy's avatar
Jim Blandy committed
188 189
int inhibit_window_system;

190 191
/* 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
192
   priority; those functions have their own extern declaration.  */
193
EMACS_INT emacs_priority;
194

Pavel Janík's avatar
Pavel Janík committed
195 196
/* 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.  */
197 198
int running_asynch_code;

199
#if defined(HAVE_X_WINDOWS) || defined(HAVE_NS)
Pavel Janík's avatar
Pavel Janík committed
200
/* If non-zero, -d was specified, meaning we're using some window system.  */
Jim Blandy's avatar
Jim Blandy committed
201 202 203 204 205 206 207
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;

208 209 210 211 212 213
/* 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;

214 215
/* If the gap between BSS end and heap start is larger than this
   output a warning in dump-emacs.  */
216 217
#define MAX_HEAP_BSS_DIFF (1024*1024)

Jim Blandy's avatar
Jim Blandy committed
218 219 220 221 222 223 224 225 226
/* 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;
227

228 229 230
/* Nonzero means Emacs was run in --quick mode.  */
int inhibit_x_resources;

231 232
/* Name for the server started by the daemon.*/
static char *daemon_name;
233

234 235
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
236
int daemon_pipe[2];
237

238 239 240
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
241

242 243
static void sort_args (int argc, char **argv);
void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
244

Kenichi Handa's avatar
Kenichi Handa committed
245 246
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
247
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
248 249 250 251 252 253
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\
254
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
255 256 257 258
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
259
--batch                     do not do interactive display; implies -q\n\
260
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
261
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
262 263 264 265 266 267 268
--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\
--no-splash                 do not display a splash screen on startup\n\
269
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
270
--quick, -Q                 equivalent to -q --no-site-file --no-splash\n\
Kenichi Handa's avatar
Kenichi Handa committed
271 272 273 274 275 276
--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
277 278
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
279
FILE                    visit FILE using find-file\n\
280 281
+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
282 283 284 285 286 287 288 289 290 291
--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\
292 293
\n"

Kenichi Handa's avatar
Kenichi Handa committed
294
#define USAGE3 "\
295
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
296
\n\
Kenichi Handa's avatar
Kenichi Handa committed
297
--background-color, -bg COLOR   window background color\n\
298 299
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
300 301
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
302
--color, --color=MODE           override color mode for character terminals;\n\
Kenichi Handa's avatar
Kenichi Handa committed
303 304 305 306 307 308 309 310 311
                                  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\
312
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
313
--geometry, -g GEOMETRY         window geometry\n\
Jan Djärv's avatar
Jan Djärv committed
314
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
315 316 317 318 319
--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\
320
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
321 322 323 324
--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
325
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
326 327
--help                          display this help and exit\n\
--version                       output version information and exit\n\
328 329 330
\n"

#define USAGE4 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
331 332 333 334 335 336
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\
337
\n\
338
Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
339 340
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
341

Pavel Janík's avatar
Pavel Janík committed
342
/* Signal code for the fatal signal that was received.  */
Jim Blandy's avatar
Jim Blandy committed
343 344
int fatal_error_code;

Pavel Janík's avatar
Pavel Janík committed
345
/* Nonzero if handling a fatal error already.  */
Jim Blandy's avatar
Jim Blandy committed
346 347
int fatal_error_in_progress;

Pavel Janík's avatar
Pavel Janík committed
348
/* If non-null, call this function from fatal_error_signal before
349 350
   committing suicide.  */

351
void (*fatal_error_signal_hook) (void);
352

353
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
354 355
/* When compiled with GTK and running under Gnome,
   multiple threads may be created.  Keep track of our main
356
   thread to make sure signals are delivered to it (see syssignal.h).  */
357 358 359 360

pthread_t main_thread;
#endif

361

Pavel Janík's avatar
Pavel Janík committed
362
/* Handle bus errors, invalid instruction, etc.  */
Jim Blandy's avatar
Jim Blandy committed
363
SIGTYPE
364
fatal_error_signal (int sig)
Jim Blandy's avatar
Jim Blandy committed
365
{
366
  SIGNAL_THREAD_CHECK (sig);
Jim Blandy's avatar
Jim Blandy committed
367 368 369
  fatal_error_code = sig;
  signal (sig, SIG_DFL);

370 371
  TOTALLY_UNBLOCK_INPUT;

Jim Blandy's avatar
Jim Blandy committed
372
  /* If fatal error occurs in code below, avoid infinite recursion.  */
373 374 375
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
376

377 378 379
      if (sig == SIGTERM || sig == SIGHUP)
        Fkill_emacs (make_number (sig));

380
      shut_down_emacs (sig, 0, Qnil);
381
    }
Jim Blandy's avatar
Jim Blandy committed
382

383 384 385 386
  /* 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.  */
387
#ifndef MSDOS
388
  sigunblock (sigmask (fatal_error_code));
389
#endif
390 391 392

  if (fatal_error_signal_hook)
    fatal_error_signal_hook ();
Pavel Janík's avatar
Pavel Janík committed
393

Jim Blandy's avatar
Jim Blandy committed
394 395
  kill (getpid (), fatal_error_code);
}
396 397 398

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
399
/* Handler for SIGDANGER.  */
400 401 402 403 404
SIGTYPE
memory_warning_signal (sig)
     int sig;
{
  signal (sig, memory_warning_signal);
405
  SIGNAL_THREAD_CHECK (sig);
406 407

  malloc_warning ("Operating system warns that virtual memory is running low.\n");
408 409 410

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
411 412
}
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
413 414

/* We define abort, rather than using it from the library,
Karl Heuer's avatar
Karl Heuer committed
415
   so that GDB can return from a breakpoint here.
Pavel Janík's avatar
Pavel Janík committed
416
   MSDOS has its own definition in msdos.c.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
417

418
#if ! defined (DOS_NT) && ! defined (NO_ABORT)
419

420
void
Andreas Schwab's avatar
Andreas Schwab committed
421
abort (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
422 423
{
  kill (getpid (), SIGABRT);
424 425
  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Richard M. Stallman's avatar
Richard M. Stallman committed
426
}
Karl Heuer's avatar
Karl Heuer committed
427
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
428

Jim Blandy's avatar
Jim Blandy committed
429

Pavel Janík's avatar
Pavel Janík committed
430
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
431

Andreas Schwab's avatar
Andreas Schwab committed
432
static void
433
init_cmdargs (int argc, char **argv, int skip_args)
Jim Blandy's avatar
Jim Blandy committed
434 435
{
  register int i;
436
  Lisp_Object name, dir, tem;
Juanma Barranquero's avatar
Juanma Barranquero committed
437
  int count = SPECPDL_INDEX ();
438
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
439

440 441 442
  initial_argv = argv;
  initial_argc = argc;

443 444 445 446 447 448 449 450 451 452 453
  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);

454 455 456 457 458 459
  /* 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,
460
		       Vexec_suffixes, &found, make_number (X_OK));
461
      if (yes == 1)
462 463 464 465 466 467 468 469
	{
	  /* 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);
	}
470
    }
471

472 473
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
474 475
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
476 477
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

478 479 480 481 482 483 484 485
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
486
	  Lisp_Object tem, lib_src_exists;
487 488
	  Lisp_Object etc_exists, info_exists;

489 490 491 492 493
	  /* 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);
494

495
#ifdef MSDOS
496 497 498 499 500
	  /* 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);
501 502 503
#else
	  info_exists = Qnil;
#endif
504 505

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
506
	    {
507 508 509
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
510
		{
511 512 513
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
514 515 516 517
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
518 519
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
520

521 522 523

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
524 525
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
526 527 528
#else
	  info_exists = Qnil;
#endif
529 530

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
531
	    {
532 533 534
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
535
		{
536 537 538 539
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
540 541 542 543 544 545 546 547
		}
	    }

	  /* 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))
	    {
548
	      name = Fexpand_file_name (tem, dir);
549 550 551 552 553 554 555
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
556 557 558 559 560
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
561 562 563
	/* 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
564
	Vcommand_line_args
565
	  = Fcons (make_unibyte_string (argv[i], strlen (argv[i])),
566
		   Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
567
    }
568 569

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
570
}
571 572

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
573 574
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
575
  (void)
576 577 578 579
{
  return Fcopy_sequence (Vinvocation_name);
}

580
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
581 582
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
583
  (void)
584 585 586 587
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
588

589 590 591 592 593 594
#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

595
#ifndef ORDINARY_LINK
596 597 598 599 600
/* 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__
601
#ifndef GCC_CTORS_IN_LIBC
602
void __do_global_ctors (void)
603
{}
604
void __do_global_ctors_aux (void)
605
{}
606
void __do_global_dtors (void)
607
{}
Richard M. Stallman's avatar
Richard M. Stallman committed
608
/* GNU/Linux has a bug in its library; avoid an error.  */
609
#ifndef GNU_LINUX
610
char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
611
#endif
612
char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
613
#endif /* GCC_CTORS_IN_LIBC */
614
void __main (void)
615 616
{}
#endif /* __GNUC__ */
617
#endif /* ORDINARY_LINK */
618

Karl Heuer's avatar
Karl Heuer committed
619 620 621 622 623 624 625 626 627
/* 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.  */
628

Karl Heuer's avatar
Karl Heuer committed
629
static int
630
argmatch (char **argv, int argc, const char *sstr, const char *lstr, int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
631
{
632
  char *p = NULL;
Karl Heuer's avatar
Karl Heuer committed
633
  int arglen;
634 635 636 637 638 639 640
  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
641 642 643 644 645 646 647 648 649 650 651 652 653
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
654
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
655
	    ? p - arg : strlen (arg));
656
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
    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;
    }
}

681
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
682

683 684 685 686 687
/* 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
688
malloc_initialize_hook (void)
689
{
690
#ifndef USE_CRT_DLL
691
  extern char **environ;
692
#endif
693

694 695
  if (initialized)
    {
696 697 698
      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
699 700 701 702
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

703
	  for (p = environ; p && *p; p++)
704 705 706 707 708 709 710 711
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
712

713
      malloc_set_state (malloc_state_ptr);
714
#ifndef XMALLOC_OVERRUN_CHECK
715
      free (malloc_state_ptr);
716
#endif
717
    }
718
  else
719 720 721 722 723
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
724 725
}

726
void (*__malloc_initialize_hook) (void) = malloc_initialize_hook;
727 728 729

#endif /* DOUG_LEA_MALLOC */

730

731 732
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
733
main (int argc, char **argv)
734
{
735
#if GC_MARK_STACK
736 737
  Lisp_Object dummy;
#endif
738
  char stack_bottom_variable;
739
  int do_initial_setlocale;
740 741 742 743 744
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
  int no_loadup = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
745
  char *junk = 0;
746
  char *dname_arg = 0;
747 748 749
#ifdef NS_IMPL_COCOA
  char dname_arg2[80];
#endif
750
  char *ch_to_dir;
751

752
#if GC_MARK_STACK
753 754 755
  stack_base = &dummy;
#endif

756 757 758 759 760
#if defined (USE_GTK) && defined (G_SLICE_ALWAYS_MALLOC)
  /* This is used by the Cygwin build.  */
  setenv ("G_SLICE", "always-malloc", 1);
#endif

761 762 763 764 765 766 767 768 769 770 771
  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);
    }

772 773 774 775 776
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

777 778
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
779 780 781 782
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

783
  sort_args (argc, argv);
784 785
  argc = 0;
  while (argv[argc]) argc++;
786

787
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
788
    {
789 790
      const char *version, *copyright;
      if (initialized)
791
	{
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
	  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
	    {
	      version = SDATA (tem);
	      copyright = SDATA (tem2);
	    }
810
	}
811 812
      else
	{
813 814
	  version = emacs_version;
	  copyright = emacs_copyright;
815
	}
816 817 818 819 820 821 822 823
      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);
824
    }
825 826 827 828 829 830 831 832
  if (argmatch (argv, argc, "-chdir", "--chdir", 2, &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);
        }

833

834 835 836 837
#ifdef HAVE_PERSONALITY_LINUX32
  if (!initialized
      && (strcmp (argv[argc-1], "dump") == 0
          || strcmp (argv[argc-1], "bootstrap") == 0)
838
      && ! getenv ("EMACS_HEAP_EXEC"))
839
    {
840
      static char heapexec[] = "EMACS_HEAP_EXEC=true";
841
      /* Set this so we only do this once.  */
842
      putenv(heapexec);
843

844 845
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
846
#define ADD_NO_RANDOMIZE 0x0040000
847
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
848 849
#undef  ADD_NO_RANDOMIZE

850
      execvp (argv[0], argv);
851

852 853
      /* If the exec fails, try to dump anyway.  */
      perror ("execvp");
854 855 856
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

857
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
858 859 860 861 862 863 864 865
  /* 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))
866
    {
867
      long newlim;
868
      extern size_t re_max_failures;
869 870 871 872 873 874 875 876
      /* 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;
877 878 879 880 881 882 883
#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
884
      if (newlim > rlim.rlim_max)
885 886
	{
	  newlim = rlim.rlim_max;
887 888
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
889
	}
890 891 892
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

893 894
      setrlimit (RLIMIT_STACK, &rlim);
    }
895
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
896

Jim Blandy's avatar
Jim Blandy committed
897 898 899 900
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
901

Jim Blandy's avatar
Jim Blandy committed
902
#ifndef SYSTEM_MALLOC
903 904
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
905

906 907 908
  /* Call malloc at least once, to run the initial __malloc_hook.
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
909

910
# ifndef SYNC_INPUT
911 912
  /* Arrange to disable interrupt input inside malloc etc.  */
  uninterrupt_malloc ();
913
# endif /* not SYNC_INPUT */
Jim Blandy's avatar
Jim Blandy committed
914 915
#endif	/* not SYSTEM_MALLOC */

916
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
917
  main_thread = pthread_self ();
918
#endif /* FORWARD_SIGNAL_TO_MAIN_THREAD */
919

920
#if defined (MSDOS) || defined (WINDOWSNT)
921 922 923
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
924
#endif /* MSDOS || WINDOWSNT */
925

926
#ifdef MSDOS
927 928 929 930 931 932 933
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
934 935
#endif /* MSDOS */

936 937 938 939 940 941 942 943 944 945 946 947 948 949
  /* 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
950 951
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
952
  /* Handle the -t switch, which specifies filename to use as terminal.  */
953 954 955 956 957 958
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
959 960 961
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
962 963 964
	  if (result < 0)
	    {
	      char *errstring = strerror (errno);
965
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
966 967 968 969 970
	      exit (1);
	    }
	  dup (0);
	  if (! isatty (0))
	    {
971
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
972 973 974
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
975
#ifdef HAVE_WINDOW_SYSTEM
976
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
977
#endif
978 979 980 981 982
	}
      else
	break;
    }

983 984 985 986
  /* 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
987
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
988

Karl Heuer's avatar
Karl Heuer committed
989
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed