emacs.c 73 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, 2001-2011
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
#ifdef WINDOWSNT
#include <fcntl.h>
34 35
#include <windows.h> /* just for w32.h */
#include "w32.h"
36
#include "w32heap.h" /* for prototype of sbrk */
37 38
#endif

39 40 41 42 43
#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
44 45
#include "lisp.h"
#include "commands.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
46
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
47
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
48
#include "window.h"
Jim Blandy's avatar
Jim Blandy committed
49

50
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
51
#include "blockinput.h"
52
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
53
#include "process.h"
54
#include "frame.h"
55
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
56
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
57
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
58

Ted Zlatanov's avatar
Ted Zlatanov committed
59 60 61 62
#ifdef HAVE_GNUTLS
#include "gnutls.h"
#endif

63 64 65 66
#ifdef HAVE_NS
#include "nsterm.h"
#endif

67 68 69 70
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

71 72 73 74 75
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

76 77 78 79
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
80 81 82 83
#ifndef O_RDWR
#define O_RDWR 2
#endif

84
#ifdef HAVE_SETPGID
Dan Nicolaescu's avatar
Dan Nicolaescu committed
85
#if !defined (USG)
86
#undef setpgrp
87 88
#define setpgrp setpgid
#endif
89
#endif
90

91
static const char emacs_version[] = VERSION;
92
static const char emacs_copyright[] = "Copyright (C) 2011 Free Software Foundation, Inc.";
93

94 95
/* Make these values available in GDB, which doesn't see macros.  */

Kenichi Handa's avatar
Kenichi Handa committed
96
#ifdef USE_LSB_TAG
97
int gdb_use_lsb EXTERNALLY_VISIBLE = 1;
Kenichi Handa's avatar
Kenichi Handa committed
98
#else
99
int gdb_use_lsb EXTERNALLY_VISIBLE = 0;
Kenichi Handa's avatar
Kenichi Handa committed
100
#endif
Dan Nicolaescu's avatar
Dan Nicolaescu committed
101
#ifndef USE_LISP_UNION_TYPE
102
int gdb_use_union EXTERNALLY_VISIBLE  = 0;
Kenichi Handa's avatar
Kenichi Handa committed
103
#else
104
int gdb_use_union EXTERNALLY_VISIBLE = 1;
Kenichi Handa's avatar
Kenichi Handa committed
105
#endif
106 107
EMACS_INT gdb_valbits EXTERNALLY_VISIBLE = VALBITS;
EMACS_INT gdb_gctypebits EXTERNALLY_VISIBLE = GCTYPEBITS;
108
#if defined (DATA_SEG_BITS) && ! defined (USE_LSB_TAG)
109
EMACS_INT gdb_data_seg_bits EXTERNALLY_VISIBLE = DATA_SEG_BITS;
110
#else
111
EMACS_INT gdb_data_seg_bits EXTERNALLY_VISIBLE = 0;
112
#endif
113 114
EMACS_INT PVEC_FLAG EXTERNALLY_VISIBLE = PSEUDOVECTOR_FLAG;
EMACS_INT gdb_array_mark_flag EXTERNALLY_VISIBLE = ARRAY_MARK_FLAG;
115 116
/* 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.  */
117
enum pvec_type gdb_pvec_type EXTERNALLY_VISIBLE = PVEC_TYPE_MASK;
118

119 120
/* 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
121

Jim Blandy's avatar
Jim Blandy committed
122 123 124 125 126
/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

127 128 129 130 131
#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.  */
132
extern void *malloc_get_state (void);
133
/* From glibc, a routine that overwrites the malloc internal state.  */
134
extern int malloc_set_state (void*);
135
/* Non-zero if the MALLOC_CHECK_ environment variable was set while
136 137
   dumping.  Used to work around a bug in glibc's malloc.  */
int malloc_using_checking;
138 139
#endif

140 141
Lisp_Object Qfile_name_handler_alist;

Glenn Morris's avatar
Glenn Morris committed
142 143
Lisp_Object Qrisky_local_variable;

Juanma Barranquero's avatar
Juanma Barranquero committed
144
/* If non-zero, emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
145
   but instead should use the virtual terminal under which it was started.  */
Jim Blandy's avatar
Jim Blandy committed
146 147
int inhibit_window_system;

Pavel Janík's avatar
Pavel Janík committed
148 149
/* 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.  */
150 151
int running_asynch_code;

152
#if defined(HAVE_X_WINDOWS) || defined(HAVE_NS)
Pavel Janík's avatar
Pavel Janík committed
153
/* If non-zero, -d was specified, meaning we're using some window system.  */
Jim Blandy's avatar
Jim Blandy committed
154 155 156 157 158 159 160
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;

161 162 163 164 165 166
/* 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;

167 168
/* If the gap between BSS end and heap start is larger than this
   output a warning in dump-emacs.  */
169 170
#define MAX_HEAP_BSS_DIFF (1024*1024)

Jim Blandy's avatar
Jim Blandy committed
171 172 173 174
/* Nonzero means running Emacs without interactive terminal.  */

int noninteractive;

175 176 177
/* Nonzero means remove site-lisp directories from load-path.  */
int no_site_lisp;

178 179
/* Name for the server started by the daemon.*/
static char *daemon_name;
180

181 182
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
183
int daemon_pipe[2];
184

185 186 187
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
188

189 190
static void sort_args (int argc, char **argv);
void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
191

Kenichi Handa's avatar
Kenichi Handa committed
192 193
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
194
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
195 196 197 198 199 200
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\
201
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
202 203 204 205
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
206
--batch                     do not do interactive display; implies -q\n\
207
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
208
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
209 210 211 212 213 214
--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\
215
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
216
--no-splash                 do not display a splash screen on startup\n\
217
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
218 219
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
Kenichi Handa's avatar
Kenichi Handa committed
220 221 222 223 224 225
--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
226 227
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
228
FILE                    visit FILE using find-file\n\
229 230
+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
231 232 233 234 235 236 237 238 239 240
--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\
241 242
\n"

Kenichi Handa's avatar
Kenichi Handa committed
243
#define USAGE3 "\
244
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
245
\n\
Kenichi Handa's avatar
Kenichi Handa committed
246
--background-color, -bg COLOR   window background color\n\
247 248
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
249 250
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
251
--color, --color=MODE           override color mode for character terminals;\n\
Kenichi Handa's avatar
Kenichi Handa committed
252 253 254 255 256 257 258 259 260
                                  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\
261
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
262
--geometry, -g GEOMETRY         window geometry\n\
Jan Djärv's avatar
Jan Djärv committed
263
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
264 265 266 267 268
--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\
269
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
270 271 272 273
--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
274
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
275 276
--help                          display this help and exit\n\
--version                       output version information and exit\n\
277 278 279
\n"

#define USAGE4 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
280 281 282 283 284 285
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\
286
\n\
287
Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
288 289
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
290

Pavel Janík's avatar
Pavel Janík committed
291
/* Signal code for the fatal signal that was received.  */
Jim Blandy's avatar
Jim Blandy committed
292 293
int fatal_error_code;

Pavel Janík's avatar
Pavel Janík committed
294
/* Nonzero if handling a fatal error already.  */
Jim Blandy's avatar
Jim Blandy committed
295 296
int fatal_error_in_progress;

Pavel Janík's avatar
Pavel Janík committed
297
/* If non-null, call this function from fatal_error_signal before
298 299
   committing suicide.  */

300
void (*fatal_error_signal_hook) (void);
301

302
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
303 304
/* When compiled with GTK and running under Gnome,
   multiple threads may be created.  Keep track of our main
305
   thread to make sure signals are delivered to it (see syssignal.h).  */
306 307 308 309

pthread_t main_thread;
#endif

310

Pavel Janík's avatar
Pavel Janík committed
311
/* Handle bus errors, invalid instruction, etc.  */
Jim Blandy's avatar
Jim Blandy committed
312
SIGTYPE
313
fatal_error_signal (int sig)
Jim Blandy's avatar
Jim Blandy committed
314
{
315
  SIGNAL_THREAD_CHECK (sig);
Jim Blandy's avatar
Jim Blandy committed
316 317 318
  fatal_error_code = sig;
  signal (sig, SIG_DFL);

319 320
  TOTALLY_UNBLOCK_INPUT;

Jim Blandy's avatar
Jim Blandy committed
321
  /* If fatal error occurs in code below, avoid infinite recursion.  */
322 323 324
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
325

326
      if (sig == SIGTERM || sig == SIGHUP || sig == SIGINT)
327 328
        Fkill_emacs (make_number (sig));

329
      shut_down_emacs (sig, 0, Qnil);
330
    }
Jim Blandy's avatar
Jim Blandy committed
331

332 333 334 335
  /* 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.  */
336
#ifndef MSDOS
337
  sigunblock (sigmask (fatal_error_code));
338
#endif
339 340 341

  if (fatal_error_signal_hook)
    fatal_error_signal_hook ();
Pavel Janík's avatar
Pavel Janík committed
342

Jim Blandy's avatar
Jim Blandy committed
343 344
  kill (getpid (), fatal_error_code);
}
345 346 347

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
348
/* Handler for SIGDANGER.  */
349 350 351 352 353
SIGTYPE
memory_warning_signal (sig)
     int sig;
{
  signal (sig, memory_warning_signal);
354
  SIGNAL_THREAD_CHECK (sig);
355 356

  malloc_warning ("Operating system warns that virtual memory is running low.\n");
357 358 359

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
360 361
}
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
362 363

/* We define abort, rather than using it from the library,
364
   so that GDB can return from a breakpoint here.
Pavel Janík's avatar
Pavel Janík committed
365
   MSDOS has its own definition in msdos.c.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
366

367
#if ! defined (DOS_NT) && ! defined (NO_ABORT)
368

369
void
370
abort (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
371 372
{
  kill (getpid (), SIGABRT);
373 374
  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Richard M. Stallman's avatar
Richard M. Stallman committed
375
}
376
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
377

Jim Blandy's avatar
Jim Blandy committed
378

Pavel Janík's avatar
Pavel Janík committed
379
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
380

Andreas Schwab's avatar
Andreas Schwab committed
381
static void
382
init_cmdargs (int argc, char **argv, int skip_args)
Jim Blandy's avatar
Jim Blandy committed
383 384
{
  register int i;
385
  Lisp_Object name, dir, tem;
386
  int count = SPECPDL_INDEX ();
387
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
388

389 390 391
  initial_argv = argv;
  initial_argc = argc;

392 393 394 395 396 397 398 399 400 401 402
  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);

403 404 405 406 407 408
  /* 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,
409
		       Vexec_suffixes, &found, make_number (X_OK));
410
      if (yes == 1)
411 412 413 414 415 416 417 418
	{
	  /* 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);
	}
419
    }
420

421 422
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
423 424
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
425 426
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

427 428 429 430 431 432 433 434
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
435
	  Lisp_Object tem, lib_src_exists;
436 437
	  Lisp_Object etc_exists, info_exists;

438 439 440 441 442
	  /* 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);
443

444
#ifdef MSDOS
445 446 447 448 449
	  /* 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);
450 451 452
#else
	  info_exists = Qnil;
#endif
453 454

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
455
	    {
456 457 458
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
459
		{
460 461 462
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
463 464 465 466
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
467 468
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
469

470 471 472

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
473 474
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
475 476 477
#else
	  info_exists = Qnil;
#endif
478 479

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
480
	    {
481 482 483
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
484
		{
485 486 487 488
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
489 490 491 492 493 494 495 496
		}
	    }

	  /* 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))
	    {
497
	      name = Fexpand_file_name (tem, dir);
498 499 500 501 502 503 504
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
505 506 507 508 509
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
510 511 512
	/* 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
513
	Vcommand_line_args
514
	  = Fcons (make_unibyte_string (argv[i], strlen (argv[i])),
515
		   Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
516
    }
517 518

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
519
}
520 521

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
522 523
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
524
  (void)
525 526 527 528
{
  return Fcopy_sequence (Vinvocation_name);
}

529
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
530 531
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
532
  (void)
533 534 535 536
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
537

538 539 540 541 542 543
#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

544
#ifndef ORDINARY_LINK
545 546 547 548 549
/* 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__
550
#ifndef GCC_CTORS_IN_LIBC
551
void __do_global_ctors (void)
552
{}
553
void __do_global_ctors_aux (void)
554
{}
555
void __do_global_dtors (void)
556
{}
Richard M. Stallman's avatar
Richard M. Stallman committed
557
/* GNU/Linux has a bug in its library; avoid an error.  */
558
#ifndef GNU_LINUX
559
char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
560
#endif
561
char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
562
#endif /* GCC_CTORS_IN_LIBC */
563
void __main (void)
564 565
{}
#endif /* __GNUC__ */
566
#endif /* ORDINARY_LINK */
567

Karl Heuer's avatar
Karl Heuer committed
568 569 570 571 572 573 574 575 576
/* 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.  */
577

Karl Heuer's avatar
Karl Heuer committed
578
static int
579
argmatch (char **argv, int argc, const char *sstr, const char *lstr, int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
580
{
581
  char *p = NULL;
Karl Heuer's avatar
Karl Heuer committed
582
  int arglen;
583 584 585 586 587 588 589
  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
590 591 592 593 594 595 596 597 598 599 600 601 602
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
603
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
604
	    ? p - arg : strlen (arg));
605
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
    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;
    }
}

630
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
631

632 633 634 635 636
/* 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
637
malloc_initialize_hook (void)
638
{
639
#ifndef USE_CRT_DLL
640
  extern char **environ;
641
#endif
642

643 644
  if (initialized)
    {
645 646 647
      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
648 649 650 651
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

652
	  for (p = environ; p && *p; p++)
653 654 655 656 657 658 659 660
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
661

662
      malloc_set_state (malloc_state_ptr);
663
#ifndef XMALLOC_OVERRUN_CHECK
664
      free (malloc_state_ptr);
665
#endif
666
    }
667
  else
668 669 670 671 672
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
673 674
}

675
void (*__malloc_initialize_hook) (void) = malloc_initialize_hook;
676 677 678

#endif /* DOUG_LEA_MALLOC */

679

680 681
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
682
main (int argc, char **argv)
683
{
684
#if GC_MARK_STACK
685 686
  Lisp_Object dummy;
#endif
687
  char stack_bottom_variable;
688
  int do_initial_setlocale;
689 690 691 692 693
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
  int no_loadup = 0;
694
  char *junk = 0;
695
  char *dname_arg = 0;
696 697 698
#ifdef NS_IMPL_COCOA
  char dname_arg2[80];
#endif
699
  char *ch_to_dir;
700

701
#if GC_MARK_STACK
702 703 704
  stack_base = &dummy;
#endif

705 706 707 708 709
#if defined (USE_GTK) && defined (G_SLICE_ALWAYS_MALLOC)
  /* This is used by the Cygwin build.  */
  setenv ("G_SLICE", "always-malloc", 1);
#endif

710 711 712 713 714 715 716 717 718 719 720
  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);
    }

721 722 723 724 725
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

726 727
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
728 729 730 731
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

732
  sort_args (argc, argv);
733 734
  argc = 0;
  while (argv[argc]) argc++;
735

736
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
737
    {
738 739
      const char *version, *copyright;
      if (initialized)
740
	{
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
	  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
	    {
756 757
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
758
	    }
759
	}
760 761
      else
	{
762 763
	  version = emacs_version;
	  copyright = emacs_copyright;
764
	}
765 766 767 768 769 770 771 772
      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);
773
    }
774 775 776 777 778 779 780 781

  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);
      }
782

783

784 785 786 787
#ifdef HAVE_PERSONALITY_LINUX32
  if (!initialized
      && (strcmp (argv[argc-1], "dump") == 0
          || strcmp (argv[argc-1], "bootstrap") == 0)
788
      && ! getenv ("EMACS_HEAP_EXEC"))
789
    {
790
      static char heapexec[] = "EMACS_HEAP_EXEC=true";
791
      /* Set this so we only do this once.  */
792
      putenv(heapexec);
793

794 795
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
796
#define ADD_NO_RANDOMIZE 0x0040000
797
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
798 799
#undef  ADD_NO_RANDOMIZE

800
      execvp (argv[0], argv);
801

802 803
      /* If the exec fails, try to dump anyway.  */
      perror ("execvp");
804 805 806
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

807
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
808 809 810 811 812 813 814 815
  /* 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))
816
    {
817
      long newlim;
818
      extern size_t re_max_failures;
819 820 821 822 823 824 825 826
      /* 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;
827 828 829 830 831 832 833
#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
834
      if (newlim > rlim.rlim_max)
835 836
	{
	  newlim = rlim.rlim_max;
837 838
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
839
	}
840 841 842
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

843 844
      setrlimit (RLIMIT_STACK, &rlim);
    }
845
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
846

Jim Blandy's avatar
Jim Blandy committed
847 848 849 850
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
851

Jim Blandy's avatar
Jim Blandy committed
852
#ifndef SYSTEM_MALLOC
853 854
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
855

856 857 858
  /* Call malloc at least once, to run the initial __malloc_hook.
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
859

860
# ifndef SYNC_INPUT
861 862
  /* Arrange to disable interrupt input inside malloc etc.  */
  uninterrupt_malloc ();
863
# endif /* not SYNC_INPUT */
Jim Blandy's avatar
Jim Blandy committed
864 865
#endif	/* not SYSTEM_MALLOC */

866
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
867
  main_thread = pthread_self ();
868
#endif /* FORWARD_SIGNAL_TO_MAIN_THREAD */
869

870
#if defined (MSDOS) || defined (WINDOWSNT)
871 872 873
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
874
#endif /* MSDOS || WINDOWSNT */
875

876
#ifdef MSDOS
877 878 879 880 881 882 883
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
884 885
#endif /* MSDOS */

886 887 888 889 890 891 892 893 894 895 896 897 898 899
  /* 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
900 901
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
902
  /* Handle the -t switch, which specifies filename to use as terminal.  */
903 904 905 906 907 908
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
909 910 911
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
912
	  if (result < 0 || dup (0) < 0)
913 914
	    {
	      char *errstring = strerror (errno);
915
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
916 917 918 919
	      exit (1);
	    }
	  if (! isatty (0))
	    {
920
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
921 922 923
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
924
#ifdef HAVE_WINDOW_SYSTEM
925
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
926
#endif
927 928 929 930 931
	}
      else
	break;
    }

932 933 934 935
  /* 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
936
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
937

Karl Heuer's avatar
Karl Heuer committed
938
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
939
  noninteractive = 0;
940
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
941 942 943 944
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
945 946 947
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
948
      /* Convert --script to -scriptload, un-skip it, and sort again
949
	 so that it will be handled in proper sequence.  */
950
      /* FIXME broken for --script=FILE - is that supposed to work?  */
951
      argv[skip_args - 1] = "-scriptload";
952 953 954
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
955

Pavel Janík's avatar
Pavel Janík committed
956
  /* Handle the --help option, which gives a usage message.  */
957
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
958
    {
Kenichi Handa's avatar
Kenichi Handa committed
959 960
      printf (USAGE1, argv[0], USAGE2);
      printf (USAGE3);
961
      printf (USAGE4);
Karl Heuer's avatar
Karl Heuer committed
962
      exit (0);
Jim Blandy's avatar
Jim Blandy committed
963 964
    }

965 966
  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
967
    {
968
#ifndef DOS_NT
969 970 971 972 973
      pid_t f;

      /* Start as a daemon: fork a new child process which will run the
	 rest of the initialization code, then exit.

974 975 976 977 978 979 980 981 982 983 984 985 986 987
	 Detaching a daemon requires the following steps:
	 - fork
	 - setsid
	 - exit the parent
	 - close the tty file-descriptors

	 We only want to do the last 2 steps once the daemon is ready to
	 serve requests, i.e. after loading .emacs (initialization).
	 OTOH initialization may start subprocesses (e.g. ispell) and these
	 should be run from the proper process (the one that will end up
	 running as daemon) and with the proper "session id" in order for
	 them to keep working after detaching, so fork and setsid need to be
	 performed before initialization.

988 989 990 991 992 993 994 995 996 997
	 We want to avoid exiting before the server socket is ready, so
	 use a pipe for synchronization.  The parent waits for the child
	 to close its end of the pipe (using `daemon-initialized')
	 before exiting.  */
      if (pipe (daemon_pipe) == -1)
	{
	  fprintf (stderr, "Cannot pipe!\n");
	  exit (1);
	}

998
#ifndef NS_IMPL_COCOA
999
      f = fork ();
Adrian Robert's avatar
Adrian Robert committed
1000 1001 1002 1003
#else /* NS_IMPL_COCOA */
      /* Under Cocoa we must do fork+exec as CoreFoundation lib fails in
         forked process: http://developer.apple.com/ReleaseNotes/
                                  CoreFoundation/CoreFoundation.html)
1004 1005 1006 1007 1008 1009 1010
         We mark being in the exec'd process by a daemon name argument of
         form "--daemon=\nFD0,FD1\nNAME" where FD are the pipe file descriptors,
         NAME is the original daemon name, if any. */
      if (!dname_arg || !strchr (dname_arg, '\n'))
	  f = fork ();  /* in orig */
      else
	  f = 0;  /* in exec'd */
Adrian Robert's avatar
Adrian Robert committed
1011
#endif /* NS_IMPL_COCOA */
1012
      if (f > 0)
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
	{
	  int retval;
	  char buf[1];

	  /* Close unused writing end of the pipe.  */
	  close (daemon_pipe[1]);

	  /* Just wait for the child to close its end of the pipe.  */
	  do
	    {
	      retval = read (daemon_pipe[0], &buf, 1);
	    }
	  while (retval == -1 && errno == EINTR);

	  if (retval < 0)
	    {
	      fprintf (stderr, "Error reading status from child\n");
	      exit (1);
	    }
1032 1033 1034 1035 1036
	  else if (retval == 0)
	    {
	      fprintf (stderr, "Error: server did not start correctly\n");
	      exit (1);
	    }
1037 1038 1039 1040

	  close (daemon_pipe[0]);
	  exit (0);
	}
1041 1042 1043
      if (f < 0)
	{
	  fprintf (stderr, "Cannot fork!\n");
1044
	  exit (1);
1045 1046
	}

1047 1048
#ifdef NS_IMPL_COCOA
      {
Adrian Robert's avatar
Adrian Robert committed
1049
        /* In orig process, forked as child, OR in exec'd. */
1050
        if (!dname_arg || !strchr (dname_arg, '\n'))
Adrian Robert's avatar
Adrian Robert committed
1051
          {  /* In orig, child: now exec w/special daemon name. */
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
            char fdStr[80];

            if (dname_arg && strlen (dname_arg) > 70)
              {
                fprintf (stderr, "daemon: child name too long\n");
                exit (1);
              }

            sprintf (fdStr, "--daemon=\n%d,%d\n%s", daemon_pipe[0],
                     daemon_pipe[1], dname_arg ? dname_arg : "");
            argv[skip_args] = fdStr;

            execv (argv[0], argv);
1065
            fprintf (stderr, "emacs daemon: exec failed: %d\n", errno);
1066 1067 1068
            exit (1);
          }

Adrian Robert's avatar
Adrian Robert committed
1069
        /* In exec'd: parse special dname into pipe and name info. */
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
        if (!dname_arg || !strchr (dname_arg, '\n')
            || strlen (dname_arg) < 1 || strlen (dname_arg) > 70)
          {
            fprintf (stderr, "emacs daemon: daemon name absent or too long\n");
            exit(1);
          }
        dname_arg2[0] = '\0';
        sscanf (dname_arg, "\n%d,%d\n%s", &(daemon_pipe[0]), &(daemon_pipe[1]),
                dname_arg2);
        dname_arg = strlen (dname_arg2) ? dname_arg2 : NULL;
      }
Adrian Robert's avatar
Adrian Robert committed
1081
#endif /* NS_IMPL_COCOA */
1082

1083 1084
      if (dname_arg)
       	daemon_name = xstrdup (dname_arg);
1085 1086
      /* Close unused reading end of the pipe.  */
      close (daemon_pipe[0]);
1087 1088 1089 1090
      /* Make sure that the used end of the pipe is closed on exec, so
	 that it is not accessible to programs started from .emacs.  */
      fcntl (daemon_pipe[1], F_SETFD, FD_CLOEXEC);

1091 1092 1093 1094
#ifdef HAVE_SETSID
      setsid();
#endif
#else /* DOS_NT */
1095 1096
      fprintf (stderr, "This platform does not support the -daemon flag.\n");
      exit (1);
1097
#endif /* DOS_NT */
1098
    }
1099

1100 1101 1102 1103 1104
  if (! noninteractive)