emacs.c 74.5 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
#ifdef WINDOWSNT
#include <fcntl.h>
36 37
#include <windows.h> /* just for w32.h */
#include "w32.h"
38
#include "w32heap.h" /* for prototype of sbrk */
39 40
#endif

41 42 43 44 45
#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
46
#include "commands.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
47
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
48
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
49
#include "window.h"
Jim Blandy's avatar
Jim Blandy committed
50

51
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
52
#include "blockinput.h"
53
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
54
#include "process.h"
55
#include "frame.h"
56
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
57
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
58
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
59

Ted Zlatanov's avatar
Ted Zlatanov committed
60 61 62 63
#ifdef HAVE_GNUTLS
#include "gnutls.h"
#endif

64 65 66 67
#ifdef HAVE_NS
#include "nsterm.h"
#endif

68 69 70 71
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif

72 73 74 75
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

76 77 78 79 80
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

81 82 83 84
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
85 86 87 88
#ifndef O_RDWR
#define O_RDWR 2
#endif

89
#ifdef HAVE_SETPGID
Dan Nicolaescu's avatar
Dan Nicolaescu committed
90
#if !defined (USG)
91
#undef setpgrp
92 93
#define setpgrp setpgid
#endif
94
#endif
95

96
static const char emacs_version[] = VERSION;
97
static const char emacs_copyright[] = "Copyright (C) 2012 Free Software Foundation, Inc.";
98

99 100
/* Make these values available in GDB, which doesn't see macros.  */

Kenichi Handa's avatar
Kenichi Handa committed
101
#ifdef USE_LSB_TAG
102
int gdb_use_lsb EXTERNALLY_VISIBLE = 1;
Kenichi Handa's avatar
Kenichi Handa committed
103
#else
104
int gdb_use_lsb EXTERNALLY_VISIBLE = 0;
Kenichi Handa's avatar
Kenichi Handa committed
105
#endif
Dan Nicolaescu's avatar
Dan Nicolaescu committed
106
#ifndef USE_LISP_UNION_TYPE
107
int gdb_use_union EXTERNALLY_VISIBLE  = 0;
Kenichi Handa's avatar
Kenichi Handa committed
108
#else
109
int gdb_use_union EXTERNALLY_VISIBLE = 1;
Kenichi Handa's avatar
Kenichi Handa committed
110
#endif
111 112
int gdb_valbits EXTERNALLY_VISIBLE = VALBITS;
int gdb_gctypebits EXTERNALLY_VISIBLE = GCTYPEBITS;
113
#if defined (DATA_SEG_BITS) && ! defined (USE_LSB_TAG)
114
uintptr_t gdb_data_seg_bits EXTERNALLY_VISIBLE = DATA_SEG_BITS;
115
#else
116
uintptr_t gdb_data_seg_bits EXTERNALLY_VISIBLE = 0;
117
#endif
118 119
ptrdiff_t PVEC_FLAG EXTERNALLY_VISIBLE = PSEUDOVECTOR_FLAG;
ptrdiff_t gdb_array_mark_flag EXTERNALLY_VISIBLE = ARRAY_MARK_FLAG;
120 121
/* 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.  */
122
enum pvec_type gdb_pvec_type EXTERNALLY_VISIBLE = PVEC_TYPE_MASK;
123

124 125
/* 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
126

Jim Blandy's avatar
Jim Blandy committed
127 128 129 130 131
/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

132 133 134 135
#ifdef DARWIN_OS
extern void unexec_init_emacs_zone (void);
#endif

136 137 138
#ifdef DOUG_LEA_MALLOC
/* Preserves a pointer to the memory allocated that copies that
   static data inside glibc's malloc.  */
139
static void *malloc_state_ptr;
140
/* From glibc, a routine that returns a copy of the malloc internal state.  */
141
extern void *malloc_get_state (void);
142
/* From glibc, a routine that overwrites the malloc internal state.  */
143
extern int malloc_set_state (void*);
144
/* Non-zero if the MALLOC_CHECK_ environment variable was set while
145
   dumping.  Used to work around a bug in glibc's malloc.  */
146
static int malloc_using_checking;
147 148
#endif

149 150
Lisp_Object Qfile_name_handler_alist;

Glenn Morris's avatar
Glenn Morris committed
151 152
Lisp_Object Qrisky_local_variable;

153 154
Lisp_Object Qkill_emacs;

155
/* If non-zero, Emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
156
   but instead should use the virtual terminal under which it was started.  */
Jim Blandy's avatar
Jim Blandy committed
157 158
int inhibit_window_system;

Pavel Janík's avatar
Pavel Janík committed
159 160
/* 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.  */
161 162
int running_asynch_code;

Juanma Barranquero's avatar
Juanma Barranquero committed
163
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
Pavel Janík's avatar
Pavel Janík committed
164
/* If non-zero, -d was specified, meaning we're using some window system.  */
Jim Blandy's avatar
Jim Blandy committed
165 166 167 168 169 170 171
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;

172
#if defined (DOUG_LEA_MALLOC) || defined (GNU_LINUX)
173 174
/* The address where the heap starts (from the first sbrk (0) call).  */
static void *my_heap_start;
175
#endif
176

177
#ifdef GNU_LINUX
178
/* The gap between BSS end and heap start as far as we can tell.  */
179 180
static uprintmax_t heap_bss_diff;
#endif
181

Jim Blandy's avatar
Jim Blandy committed
182 183 184
/* Nonzero means running Emacs without interactive terminal.  */
int noninteractive;

185 186 187
/* Nonzero means remove site-lisp directories from load-path.  */
int no_site_lisp;

188 189
/* Name for the server started by the daemon.*/
static char *daemon_name;
190

191 192
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
193
int daemon_pipe[2];
194

195 196 197
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
198

199
static void sort_args (int argc, char **argv);
200
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
201

Kenichi Handa's avatar
Kenichi Handa committed
202 203
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
204
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
205 206 207 208 209 210
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\
211
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
212 213 214 215
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
216
--batch                     do not do interactive display; implies -q\n\
217
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
218
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
219 220 221 222 223 224
--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\
225
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
226
--no-splash                 do not display a splash screen on startup\n\
227
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
228 229
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
Kenichi Handa's avatar
Kenichi Handa committed
230 231 232 233 234 235
--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
236 237
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
238
FILE                    visit FILE using find-file\n\
239 240
+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
241 242 243 244 245 246 247 248 249 250
--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\
251 252
\n"

Kenichi Handa's avatar
Kenichi Handa committed
253
#define USAGE3 "\
254
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
255
\n\
Kenichi Handa's avatar
Kenichi Handa committed
256
--background-color, -bg COLOR   window background color\n\
257 258
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
259 260
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
261
--color, --color=MODE           override color mode for character terminals;\n\
262 263
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
264 265 266 267 268
                                  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\
269
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
270
--fullwidth, -fw                make the first frame wide as the screen\n\
271
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
272
--geometry, -g GEOMETRY         window geometry\n\
Jan Djärv's avatar
Jan Djärv committed
273
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
274 275 276 277 278
--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\
279
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
280 281 282 283
--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
284
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
285 286
--help                          display this help and exit\n\
--version                       output version information and exit\n\
287 288 289
\n"

#define USAGE4 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
290 291 292 293 294 295
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\
296
\n\
297
Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
298 299
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
300

Pavel Janík's avatar
Pavel Janík committed
301
/* Signal code for the fatal signal that was received.  */
302
static int fatal_error_code;
Jim Blandy's avatar
Jim Blandy committed
303

Pavel Janík's avatar
Pavel Janík committed
304
/* Nonzero if handling a fatal error already.  */
Jim Blandy's avatar
Jim Blandy committed
305 306
int fatal_error_in_progress;

Pavel Janík's avatar
Pavel Janík committed
307
/* If non-null, call this function from fatal_error_signal before
308 309
   committing suicide.  */

310
static void (*fatal_error_signal_hook) (void);
311

312
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
313 314
/* When compiled with GTK and running under Gnome,
   multiple threads may be created.  Keep track of our main
315
   thread to make sure signals are delivered to it (see syssignal.h).  */
316 317 318 319

pthread_t main_thread;
#endif

320 321 322 323 324 325
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
#endif  

 
326

Pavel Janík's avatar
Pavel Janík committed
327
/* Handle bus errors, invalid instruction, etc.  */
328 329 330
#ifndef FLOAT_CATCH_SIGILL
static
#endif
331
void
332
fatal_error_signal (int sig)
Jim Blandy's avatar
Jim Blandy committed
333
{
334
  SIGNAL_THREAD_CHECK (sig);
Jim Blandy's avatar
Jim Blandy committed
335 336 337
  fatal_error_code = sig;
  signal (sig, SIG_DFL);

338 339
  TOTALLY_UNBLOCK_INPUT;

Jim Blandy's avatar
Jim Blandy committed
340
  /* If fatal error occurs in code below, avoid infinite recursion.  */
341 342 343
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
344

345
      if (sig == SIGTERM || sig == SIGHUP || sig == SIGINT)
346 347
        Fkill_emacs (make_number (sig));

348
      shut_down_emacs (sig, 0, Qnil);
349
    }
Jim Blandy's avatar
Jim Blandy committed
350

351 352 353 354
  /* 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.  */
355
#ifndef MSDOS
356
  sigunblock (sigmask (fatal_error_code));
357
#endif
358 359 360

  if (fatal_error_signal_hook)
    fatal_error_signal_hook ();
Pavel Janík's avatar
Pavel Janík committed
361

Jim Blandy's avatar
Jim Blandy committed
362 363
  kill (getpid (), fatal_error_code);
}
364 365 366

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
367
/* Handler for SIGDANGER.  */
368
void
Andreas Schwab's avatar
Andreas Schwab committed
369
memory_warning_signal (int sig)
370 371
{
  signal (sig, memory_warning_signal);
372
  SIGNAL_THREAD_CHECK (sig);
373 374

  malloc_warning ("Operating system warns that virtual memory is running low.\n");
375 376 377

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
378 379
}
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
380 381

/* We define abort, rather than using it from the library,
Karl Heuer's avatar
Karl Heuer committed
382
   so that GDB can return from a breakpoint here.
Pavel Janík's avatar
Pavel Janík committed
383
   MSDOS has its own definition in msdos.c.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
384

385
#if ! defined (DOS_NT) && ! defined (NO_ABORT)
386

387
void
Andreas Schwab's avatar
Andreas Schwab committed
388
abort (void)
Richard M. Stallman's avatar
Richard M. Stallman committed
389 390
{
  kill (getpid (), SIGABRT);
391 392
  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Richard M. Stallman's avatar
Richard M. Stallman committed
393
}
Karl Heuer's avatar
Karl Heuer committed
394
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
395

Jim Blandy's avatar
Jim Blandy committed
396

Pavel Janík's avatar
Pavel Janík committed
397
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
398

Andreas Schwab's avatar
Andreas Schwab committed
399
static void
400
init_cmdargs (int argc, char **argv, int skip_args)
Jim Blandy's avatar
Jim Blandy committed
401 402
{
  register int i;
403
  Lisp_Object name, dir, handler;
404
  ptrdiff_t count = SPECPDL_INDEX ();
405
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
406

407 408 409
  initial_argv = argv;
  initial_argc = argc;

410 411 412 413
  raw_name = build_string (argv[0]);

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
414 415
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
416 417 418 419 420
    raw_name = concat2 (build_string ("/:"), raw_name);

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

421 422 423 424 425 426
  /* 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,
427
		       Vexec_suffixes, &found, make_number (X_OK));
428
      if (yes == 1)
429 430 431
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
432 433
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
434 435 436
	    found = concat2 (build_string ("/:"), found);
	  Vinvocation_directory = Ffile_name_directory (found);
	}
437
    }
438

439 440
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
441 442
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
443 444
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

445 446 447 448 449 450 451 452
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
453
	  Lisp_Object tem, lib_src_exists;
454 455
	  Lisp_Object etc_exists, info_exists;

456 457 458 459 460
	  /* 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);
461

462
#ifdef MSDOS
463 464 465 466 467
	  /* 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);
468 469 470
#else
	  info_exists = Qnil;
#endif
471 472

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
473
	    {
474 475 476
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
477
		{
478 479 480
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
481 482 483 484
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
485 486
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
487

488 489 490

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
491 492
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
493 494 495
#else
	  info_exists = Qnil;
#endif
496 497

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
498
	    {
499 500 501
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
502
		{
503 504 505 506
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
507 508 509 510 511 512 513 514
		}
	    }

	  /* 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))
	    {
515
	      name = Fexpand_file_name (tem, dir);
516 517 518 519 520 521 522
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
523 524 525 526 527
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
528 529 530
	/* 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
531
	Vcommand_line_args
532
	  = Fcons (make_unibyte_string (argv[i], strlen (argv[i])),
533
		   Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
534
    }
535 536

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
537
}
538 539

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
540 541
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
542
  (void)
543 544 545 546
{
  return Fcopy_sequence (Vinvocation_name);
}

547
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
548 549
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
550
  (void)
551 552 553 554
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
555

556 557 558 559 560 561
#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

562
#ifndef ORDINARY_LINK
563 564 565 566 567
/* 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__
568 569 570

/* Define a dummy function F.  Declare F too, to pacify gcc
   -Wmissing-prototypes.  */
571 572
#define DEFINE_DUMMY_FUNCTION(f) \
  void f (void) EXTERNALLY_VISIBLE; void f (void) {}
573

574
#ifndef GCC_CTORS_IN_LIBC
575 576 577
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
578
/* GNU/Linux has a bug in its library; avoid an error.  */
579
#ifndef GNU_LINUX
580
char * __CTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
581
#endif
582
char * __DTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
583
#endif /* GCC_CTORS_IN_LIBC */
584
DEFINE_DUMMY_FUNCTION (__main)
585
#endif /* __GNUC__ */
586
#endif /* ORDINARY_LINK */
587

Karl Heuer's avatar
Karl Heuer committed
588 589 590 591 592 593 594 595 596
/* 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.  */
597

Karl Heuer's avatar
Karl Heuer committed
598
static int
599 600
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
601
{
602
  char *p = NULL;
603
  ptrdiff_t arglen;
604 605 606 607 608 609 610
  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
611 612 613 614 615 616 617 618 619 620 621 622 623
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
624
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
625
	    ? p - arg : strlen (arg));
626
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
    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;
    }
}

651
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
652

653 654 655 656 657
/* 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
658
malloc_initialize_hook (void)
659
{
660
#ifndef USE_CRT_DLL
661
  extern char **environ;
662
#endif
663

664 665
  if (initialized)
    {
666 667 668
      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
669 670 671 672
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

673
	  for (p = environ; p && *p; p++)
674 675 676 677 678 679 680 681
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
682

683
      malloc_set_state (malloc_state_ptr);
684
#ifndef XMALLOC_OVERRUN_CHECK
685
      free (malloc_state_ptr);
686
#endif
687
    }
688
  else
689 690 691 692 693
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
694 695
}

696
void (*__malloc_initialize_hook) (void) EXTERNALLY_VISIBLE = malloc_initialize_hook;
697 698 699

#endif /* DOUG_LEA_MALLOC */

700

701 702
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
703
main (int argc, char **argv)
704
{
705
#if GC_MARK_STACK
706 707
  Lisp_Object dummy;
#endif
708
  char stack_bottom_variable;
709
  int do_initial_setlocale;
710 711 712 713 714
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
  int no_loadup = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
715
  char *junk = 0;
716
  char *dname_arg = 0;
717 718 719
#ifdef NS_IMPL_COCOA
  char dname_arg2[80];
#endif
720
  char *ch_to_dir;
721

722
#if GC_MARK_STACK
723 724 725
  stack_base = &dummy;
#endif

726 727 728 729 730
#if defined (USE_GTK) && defined (G_SLICE_ALWAYS_MALLOC)
  /* This is used by the Cygwin build.  */
  setenv ("G_SLICE", "always-malloc", 1);
#endif

731
#ifdef GNU_LINUX
732 733 734 735 736 737 738 739 740 741
  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);
    }
742
#endif
743

744 745 746 747 748
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

749 750
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
751 752 753 754
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

755
  sort_args (argc, argv);
756 757
  argc = 0;
  while (argv[argc]) argc++;
758

759
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
760
    {
761 762
      const char *version, *copyright;
      if (initialized)
763
	{
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
	  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
	    {
779 780
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
781
	    }
782
	}
783 784
      else
	{
785 786
	  version = emacs_version;
	  copyright = emacs_copyright;
787
	}
788 789 790 791 792 793 794 795
      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);
796
    }
797 798 799 800 801 802 803 804

  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);
      }
805

806

807 808 809 810
#ifdef HAVE_PERSONALITY_LINUX32
  if (!initialized
      && (strcmp (argv[argc-1], "dump") == 0
          || strcmp (argv[argc-1], "bootstrap") == 0)
811
      && ! getenv ("EMACS_HEAP_EXEC"))
812
    {
813
      static char heapexec[] = "EMACS_HEAP_EXEC=true";
814
      /* Set this so we only do this once.  */
Juanma Barranquero's avatar
Juanma Barranquero committed
815
      putenv (heapexec);
816

817 818
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
819
#define ADD_NO_RANDOMIZE 0x0040000
820
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
821 822
#undef  ADD_NO_RANDOMIZE

823
      execvp (argv[0], argv);
824

825 826
      /* If the exec fails, try to dump anyway.  */
      perror ("execvp");
827 828 829
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

830
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
831 832 833 834 835 836 837 838
  /* 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))
839
    {
840
      long newlim;
841
      extern size_t re_max_failures;
842 843 844 845 846 847 848 849
      /* 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;
850 851 852 853 854
#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
855
      newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize ();
856
#endif
857
      if (newlim > rlim.rlim_max)
858 859
	{
	  newlim = rlim.rlim_max;
860 861
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
862
	}
863 864 865
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

866 867
      setrlimit (RLIMIT_STACK, &rlim);
    }
868
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
869

Jim Blandy's avatar
Jim Blandy committed
870 871 872 873
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
874

Jim Blandy's avatar
Jim Blandy committed
875
#ifndef SYSTEM_MALLOC
876 877
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
878

879 880 881
  /* Call malloc at least once, to run the initial __malloc_hook.
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
882

883
# ifndef SYNC_INPUT
884 885
  /* Arrange to disable interrupt input inside malloc etc.  */
  uninterrupt_malloc ();
886
# endif /* not SYNC_INPUT */
Jim Blandy's avatar
Jim Blandy committed
887 888
#endif	/* not SYSTEM_MALLOC */

889
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
890
  main_thread = pthread_self ();
891
#endif /* FORWARD_SIGNAL_TO_MAIN_THREAD */
892

893
#if defined (MSDOS) || defined (WINDOWSNT)
894 895 896
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
897
#endif /* MSDOS || WINDOWSNT */
898

899
#ifdef MSDOS
900 901 902 903 904 905 906
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
907 908
#endif /* MSDOS */

909 910 911 912 913 914 915 916 917 918 919 920 921 922
  /* 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
923 924
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
925
  /* Handle the -t switch, which specifies filename to use as terminal.  */
926 927 928 929 930 931
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
932 933 934
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
935
	  if (result < 0 || dup (0) < 0)
936 937
	    {
	      char *errstring = strerror (errno);
938
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
939 940 941 942
	      exit (1);
	    }
	  if (! isatty (0))
	    {
943
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
944 945 946
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
947
#ifdef HAVE_WINDOW_SYSTEM
948
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
949
#endif
950 951 952 953 954
	}
      else
	break;
    }

955
  /* Command line option --no-windows is deprecated and thus not mentioned
Paul Eggert's avatar
Paul Eggert committed
956
     in the manual and usage information.  */
957 958
  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
959
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
960

Karl Heuer's avatar
Karl Heuer committed
961
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
962
  noninteractive = 0;
963
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
964 965 966 967
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
968 969 970
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
Glenn Morris's avatar
Glenn Morris committed
971
      /* Convert --script to -scriptload, un-skip it, and sort again
972
	 so that it will be handled in proper sequence.  */
973
      /* FIXME broken for --script=FILE - is that supposed to work?  */
974
      argv[skip_args - 1] = (char *) "-scriptload";
Richard M. Stallman's avatar
Richard M. Stallman committed
975 976 977
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
978

Pavel Janík's avatar
Pavel Janík committed
979
  /* Handle the --help option, which gives a usage message.  */
980
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
981
    {
Kenichi Handa's avatar
Kenichi Handa committed
982 983
      printf (USAGE1, argv[0], USAGE2);
      printf (USAGE3);
984
      printf (USAGE4);
Karl Heuer's avatar
Karl Heuer committed
985
      exit (0);
Jim Blandy's avatar
Jim Blandy committed
986 987
    }

988 989
  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
990
    {
991
#ifndef DOS_NT
992 993 994 995 996
      pid_t f;

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

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	 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.

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
	 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);
	}

1021
#ifndef NS_IMPL_COCOA
1022 1023 1024 1025 1026
#ifdef USE_GTK
      fprintf (stderr, "\nWarning: due to a long standing Gtk+ bug\nhttp://bugzilla.gnome.org/show_bug.cgi?id=85715\n\
Emacs might crash when run in daemon mode and the X11 connection is unexpectedly lost.\n\
Using an Emacs configured with --with-x-toolkit=lucid does not have this problem.\n");
#endif
1027
      f = fork ();
Adrian Robert's avatar
Adrian Robert committed
1028 1029 1030 1031
#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)
1032 1033 1034 1035 1036 1037 1038
         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
1039
#endif /* NS_IMPL_COCOA */
1040
      if (f > 0)
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
	{
	  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);
	    }
1060 1061 1062 1063 1064
	  else if (retval == 0)
	    {
	      fprintf (stderr, "Error: server did not start correctly\n");
	      exit (1);
	    }
1065 1066 1067 1068

	  close (daemon_pipe[0]);
	  exit