emacs.c 70.6 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
#include <errno.h>
#include <stdio.h>

#include <sys/types.h>
#include <sys/file.h>
28 29
#include <unistd.h>

30
#include <ignore-value.h>
31 32

#include "lisp.h"
33

34 35
#ifdef WINDOWSNT
#include <fcntl.h>
36
#include "w32.h"
Daniel Colascione's avatar
Daniel Colascione committed
37 38 39 40 41 42 43 44 45 46 47 48 49
#endif

#if defined (WINDOWSNT)
#include "w32heap.h"
#endif

#if defined (WINDOWSNT) || defined (HAVE_NTGUI)
#include "w32select.h"
#include "w32font.h"
#endif

#if defined (HAVE_NTGUI) && defined (CYGWIN)
#include "cygw32.h"
50 51
#endif

52 53 54 55
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

56 57 58 59 60
#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
61
#include "commands.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
62
#include "intervals.h"
63
#include "character.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
64
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
65
#include "window.h"
Jim Blandy's avatar
Jim Blandy committed
66

67
#include "systty.h"
68
#include "atimer.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
69
#include "blockinput.h"
70
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
71
#include "process.h"
72
#include "frame.h"
73
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
74
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
75
#include "keymap.h"
Jim Blandy's avatar
Jim Blandy committed
76

Ted Zlatanov's avatar
Ted Zlatanov committed
77 78 79 80
#ifdef HAVE_GNUTLS
#include "gnutls.h"
#endif

81 82 83 84 85 86
#if (defined PROFILING \
     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
# include <sys/gmon.h>
extern void moncontrol (int mode);
#endif

87 88 89 90
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

91 92 93 94 95
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

96 97 98 99
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
100 101 102 103
#ifndef O_RDWR
#define O_RDWR 2
#endif

104
static const char emacs_version[] = VERSION;
105
static const char emacs_copyright[] = COPYRIGHT;
106

107 108
/* 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
109

110 111 112 113 114
#ifdef WINDOWSNT
/* Cache for externally loaded libraries.  */
Lisp_Object Vlibrary_cache;
#endif

115 116 117 118
/* Set after Emacs has started up the first time.
   Prevents reinitialization of the Lisp world and keymaps
   on subsequent starts.  */
bool initialized;
Jim Blandy's avatar
Jim Blandy committed
119

120 121 122 123
#ifdef DARWIN_OS
extern void unexec_init_emacs_zone (void);
#endif

124 125 126
#ifdef DOUG_LEA_MALLOC
/* Preserves a pointer to the memory allocated that copies that
   static data inside glibc's malloc.  */
127
static void *malloc_state_ptr;
128
/* From glibc, a routine that returns a copy of the malloc internal state.  */
129
extern void *malloc_get_state (void);
130
/* From glibc, a routine that overwrites the malloc internal state.  */
131
extern int malloc_set_state (void*);
132
/* True if the MALLOC_CHECK_ environment variable was set while
133
   dumping.  Used to work around a bug in glibc's malloc.  */
134
static bool malloc_using_checking;
135 136
#endif

137 138
Lisp_Object Qfile_name_handler_alist;

Glenn Morris's avatar
Glenn Morris committed
139 140
Lisp_Object Qrisky_local_variable;

141 142
Lisp_Object Qkill_emacs;

143
/* If true, Emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
144
   but instead should use the virtual terminal under which it was started.  */
145
bool inhibit_window_system;
Jim Blandy's avatar
Jim Blandy committed
146

147
/* If true, a filter or a sentinel is running.  Tested to save the match
Pavel Janík's avatar
Pavel Janík committed
148
   data on the first attempt to change it inside asynchronous code.  */
149
bool running_asynch_code;
150

Juanma Barranquero's avatar
Juanma Barranquero committed
151
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
152 153
/* If true, -d was specified, meaning we're using some window system.  */
bool display_arg;
Jim Blandy's avatar
Jim Blandy committed
154 155 156 157 158 159
#endif

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

160
#if defined (DOUG_LEA_MALLOC) || defined (GNU_LINUX)
161 162
/* The address where the heap starts (from the first sbrk (0) call).  */
static void *my_heap_start;
163
#endif
164

165
#ifdef GNU_LINUX
166
/* The gap between BSS end and heap start as far as we can tell.  */
167 168
static uprintmax_t heap_bss_diff;
#endif
169

170 171 172 173 174 175 176 177 178 179 180 181
/* To run as a daemon under Cocoa or Windows, we must do a fork+exec,
   not a simple fork.

   On Cocoa, CoreFoundation lib fails in forked process:
   http://developer.apple.com/ReleaseNotes/
   CoreFoundation/CoreFoundation.html)

   On Windows, a Cygwin fork child cannot access the USER subsystem.

   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. */
182
#if defined (NS_IMPL_COCOA) || (defined (HAVE_NTGUI) && defined (CYGWIN))
183 184 185
# define DAEMON_MUST_EXEC
#endif

186 187
/* True means running Emacs without interactive terminal.  */
bool noninteractive;
Jim Blandy's avatar
Jim Blandy committed
188

189 190
/* True means remove site-lisp directories from load-path.  */
bool no_site_lisp;
191

192 193
/* Name for the server started by the daemon.*/
static char *daemon_name;
194

195 196
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
197
int daemon_pipe[2];
198

199 200 201
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
202

203
static void sort_args (int argc, char **argv);
204
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
205

Kenichi Handa's avatar
Kenichi Handa committed
206 207
/* MSVC needs each string be shorter than 2048 bytes, so the usage
   strings below are split to not overflow this limit.  */
208
#define USAGE1 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
209 210 211 212 213 214
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\
215
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
216 217 218 219
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
220
--batch                     do not do interactive display; implies -q\n\
221
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
222
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
223 224 225 226 227 228
--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\
229
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
230
--no-splash                 do not display a splash screen on startup\n\
231
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
232 233
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
Kenichi Handa's avatar
Kenichi Handa committed
234 235 236 237 238 239
--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
240 241
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
242
FILE                    visit FILE using find-file\n\
243 244
+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
245 246 247 248 249 250 251 252 253 254
--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\
255 256
\n"

Kenichi Handa's avatar
Kenichi Handa committed
257
#define USAGE3 "\
258
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
259
\n\
Kenichi Handa's avatar
Kenichi Handa committed
260
--background-color, -bg COLOR   window background color\n\
261 262
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
263 264
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
265
--color, --color=MODE           override color mode for character terminals;\n\
266 267
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
268 269 270 271 272
                                  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\
273
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
274
--fullwidth, -fw                make the first frame wide as the screen\n\
275
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
276
--geometry, -g GEOMETRY         window geometry\n\
Jan Djärv's avatar
Jan Djärv committed
277
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
278 279 280 281 282
--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\
283
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
284 285 286 287
--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
288
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
289 290
--help                          display this help and exit\n\
--version                       output version information and exit\n\
291 292 293
\n"

#define USAGE4 "\
Gerd Moellmann's avatar
Gerd Moellmann committed
294 295 296 297 298 299
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\
300
\n\
301
Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
302 303
section of the Emacs manual or the file BUGS.\n"

Jim Blandy's avatar
Jim Blandy committed
304

305 306
/* True if handling a fatal error already.  */
bool fatal_error_in_progress;
307

308 309 310
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
311 312
#endif

313

314

315 316 317
/* Report a fatal error due to signal SIG, output a backtrace of at
   most BACKTRACE_LIMIT lines, and exit.  */
_Noreturn void
318
terminate_due_to_signal (int sig, int backtrace_limit)
Jim Blandy's avatar
Jim Blandy committed
319 320
{
  signal (sig, SIG_DFL);
321
  totally_unblock_input ();
322

Jim Blandy's avatar
Jim Blandy committed
323
  /* If fatal error occurs in code below, avoid infinite recursion.  */
324 325 326
  if (! fatal_error_in_progress)
    {
      fatal_error_in_progress = 1;
Jim Blandy's avatar
Jim Blandy committed
327

328
      if (sig == SIGTERM || sig == SIGHUP || sig == SIGINT)
329 330
        Fkill_emacs (make_number (sig));

331
      shut_down_emacs (sig, Qnil);
332
      emacs_backtrace (backtrace_limit);
333
    }
Jim Blandy's avatar
Jim Blandy committed
334

335
  /* Signal the same code; this time it will really be fatal.
336 337
     Since we're in a signal handler, the signal is blocked, so we
     have to unblock it if we want to really receive it.  */
338
#ifndef MSDOS
Paul Eggert's avatar
Paul Eggert committed
339 340 341
  {
    sigset_t unblocked;
    sigemptyset (&unblocked);
342
    sigaddset (&unblocked, sig);
Paul Eggert's avatar
Paul Eggert committed
343 344
    pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
  }
345
#endif
346

347
  emacs_raise (sig);
348 349 350

  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Jim Blandy's avatar
Jim Blandy committed
351
}
352 353 354

#ifdef SIGDANGER

Richard M. Stallman's avatar
Richard M. Stallman committed
355
/* Handler for SIGDANGER.  */
356 357
static void
handle_danger_signal (int sig)
358 359
{
  malloc_warning ("Operating system warns that virtual memory is running low.\n");
360 361 362

  /* It might be unsafe to call do_auto_save now.  */
  force_auto_save_soon ();
363
}
Richard M. Stallman's avatar
Richard M. Stallman committed
364

365 366
static void
deliver_danger_signal (int sig)
Richard M. Stallman's avatar
Richard M. Stallman committed
367
{
368
  deliver_process_signal (sig, handle_danger_signal);
Richard M. Stallman's avatar
Richard M. Stallman committed
369
}
370
#endif
Jim Blandy's avatar
Jim Blandy committed
371

Pavel Janík's avatar
Pavel Janík committed
372
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
373

Andreas Schwab's avatar
Andreas Schwab committed
374
static void
375
init_cmdargs (int argc, char **argv, int skip_args)
Jim Blandy's avatar
Jim Blandy committed
376 377
{
  register int i;
378
  Lisp_Object name, dir, handler;
379
  ptrdiff_t count = SPECPDL_INDEX ();
380
  Lisp_Object raw_name;
Jim Blandy's avatar
Jim Blandy committed
381

382 383 384
  initial_argv = argv;
  initial_argc = argc;

385 386 387 388
  raw_name = build_string (argv[0]);

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
389 390
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
391 392 393 394 395
    raw_name = concat2 (build_string ("/:"), raw_name);

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

396 397 398 399 400 401
  /* 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,
402
		       Vexec_suffixes, &found, make_number (X_OK));
403
      if (yes == 1)
404 405 406
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
407 408
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
409 410 411
	    found = concat2 (build_string ("/:"), found);
	  Vinvocation_directory = Ffile_name_directory (found);
	}
412
    }
413

414 415
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
416 417
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
418 419
    Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);

420 421 422 423 424
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
425 426 427 428 429 430 431 432 433 434
#ifdef WINDOWSNT
      /* If we are running from the build directory, set DIR to the
	 src subdirectory of the Emacs tree, like on Posix
	 platforms.  */
      if (SBYTES (dir) > sizeof ("/i386/") - 1
	  && 0 == strcmp (SSDATA (dir) + SBYTES (dir) - sizeof ("/i386/") + 1,
			  "/i386/"))
	dir = Fexpand_file_name (build_string ("../.."), dir);
#else  /* !WINDOWSNT */
#endif
435 436 437
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
438
	  Lisp_Object tem, lib_src_exists;
439 440
	  Lisp_Object etc_exists, info_exists;

441 442 443 444 445
	  /* 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);
446

447
#ifdef MSDOS
448 449 450 451 452
	  /* 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);
453 454 455
#else
	  info_exists = Qnil;
#endif
456 457

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
458
	    {
459 460 461
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
462
		{
463 464 465
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
466 467 468 469
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
470 471
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
472

473 474 475

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
476 477
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
478 479 480
#else
	  info_exists = Qnil;
#endif
481 482

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
483
	    {
484 485 486
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
487
		{
488 489 490 491
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
492 493 494 495 496 497 498 499
		}
	    }

	  /* 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))
	    {
500
	      name = Fexpand_file_name (tem, dir);
501 502 503 504 505 506 507
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
508 509 510 511 512
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
513 514 515
	/* 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
516
	Vcommand_line_args
517
	  = Fcons (make_unibyte_string (argv[i], strlen (argv[i])),
518
		   Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
519
    }
520 521

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
522
}
523 524

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
525 526
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
527
  (void)
528 529 530 531
{
  return Fcopy_sequence (Vinvocation_name);
}

532
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
533 534
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
535
  (void)
536 537 538 539
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
540

541 542 543 544 545 546
#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

547
#ifndef ORDINARY_LINK
548 549 550 551 552
/* 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__
553 554 555

/* Define a dummy function F.  Declare F too, to pacify gcc
   -Wmissing-prototypes.  */
556
#define DEFINE_DUMMY_FUNCTION(f) \
557
  void f (void) ATTRIBUTE_CONST EXTERNALLY_VISIBLE; void f (void) {}
558

559
#ifndef GCC_CTORS_IN_LIBC
560 561 562
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
563
/* GNU/Linux has a bug in its library; avoid an error.  */
564
#ifndef GNU_LINUX
565
char * __CTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
566
#endif
567
char * __DTOR_LIST__[2] EXTERNALLY_VISIBLE = { (char *) (-1), 0 };
568
#endif /* GCC_CTORS_IN_LIBC */
569
DEFINE_DUMMY_FUNCTION (__main)
570
#endif /* __GNUC__ */
571
#endif /* ORDINARY_LINK */
572

Karl Heuer's avatar
Karl Heuer committed
573 574 575 576 577 578 579 580 581
/* 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.  */
582

583
static bool
584 585
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
586
{
587
  char *p = NULL;
588
  ptrdiff_t arglen;
589 590 591 592 593 594 595
  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
596 597 598 599 600 601 602 603 604 605 606 607 608
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
609
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
610
	    ? p - arg : strlen (arg));
611
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635
    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;
    }
}

636
#ifdef DOUG_LEA_MALLOC
Jim Blandy's avatar
Jim Blandy committed
637

638 639 640 641 642
/* 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
643
malloc_initialize_hook (void)
644
{
645 646
  if (initialized)
    {
647 648 649
      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
650 651 652 653
	   malloc checking.  Can't use unsetenv, since that calls malloc.  */
	{
	  char **p;

654
	  for (p = environ; p && *p; p++)
655 656 657 658 659 660 661 662
	    if (strncmp (*p, "MALLOC_CHECK_=", 14) == 0)
	      {
		do
		  *p = p[1];
		while (*++p);
		break;
	      }
	}
663

664
      malloc_set_state (malloc_state_ptr);
665
#ifndef XMALLOC_OVERRUN_CHECK
666
      free (malloc_state_ptr);
667
#endif
668
    }
669
  else
670 671 672 673 674
    {
      if (my_heap_start == 0)
        my_heap_start = sbrk (0);
      malloc_using_checking = getenv ("MALLOC_CHECK_") != NULL;
    }
675 676
}

677
void (*__malloc_initialize_hook) (void) EXTERNALLY_VISIBLE = malloc_initialize_hook;
678 679 680

#endif /* DOUG_LEA_MALLOC */

681

682 683
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
684
main (int argc, char **argv)
685
{
686
#if GC_MARK_STACK
687 688
  Lisp_Object dummy;
#endif
689
  char stack_bottom_variable;
690
  bool do_initial_setlocale;
691
  bool dumping;
692 693 694 695
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
696
  bool no_loadup = 0;
697
  char *junk = 0;
698
  char *dname_arg = 0;
699
#ifdef DAEMON_MUST_EXEC
700
  char dname_arg2[80];
701
#endif /* DAEMON_MUST_EXEC */
702
  char *ch_to_dir;
703

704
#if GC_MARK_STACK
705 706 707
  stack_base = &dummy;
#endif

708 709 710 711 712
#if defined (USE_GTK) && defined (G_SLICE_ALWAYS_MALLOC)
  /* This is used by the Cygwin build.  */
  setenv ("G_SLICE", "always-malloc", 1);
#endif

713
#ifdef GNU_LINUX
714 715 716 717 718 719 720 721 722 723
  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);
    }
724
#endif
725

726 727 728 729 730
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

731 732
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
733 734 735 736
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

737
  sort_args (argc, argv);
738 739
  argc = 0;
  while (argv[argc]) argc++;
740

741
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
742
    {
743 744
      const char *version, *copyright;
      if (initialized)
745
	{
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
	  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
	    {
761 762
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
763
	    }
764
	}
765 766
      else
	{
767 768
	  version = emacs_version;
	  copyright = emacs_copyright;
769
	}
770 771 772 773 774 775 776 777
      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);
778
    }
779 780 781 782 783 784 785 786

  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);
      }
787

788 789
  dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
			     || strcmp (argv[argc - 1], "bootstrap") == 0);
790

791
#ifdef HAVE_PERSONALITY_LINUX32
792
  if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
793
    {
794
      static char heapexec[] = "EMACS_HEAP_EXEC=true";
795
      /* Set this so we only do this once.  */
Juanma Barranquero's avatar
Juanma Barranquero committed
796
      putenv (heapexec);
797

798 799
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
800
#define ADD_NO_RANDOMIZE 0x0040000
801
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
802 803
#undef  ADD_NO_RANDOMIZE

804
      execvp (argv[0], argv);
805

806 807
      /* If the exec fails, try to dump anyway.  */
      perror ("execvp");
808 809 810
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

811
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
812 813 814 815 816 817 818 819
  /* 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))
820
    {
821
      long newlim;
822
      extern size_t re_max_failures;
823 824 825 826 827 828 829 830
      /* 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;
831 832 833 834 835
#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
836
      newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize ();
837
#endif
838
      if (newlim > rlim.rlim_max)
839 840
	{
	  newlim = rlim.rlim_max;
841 842
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
843
	}
844 845 846
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

847 848
      setrlimit (RLIMIT_STACK, &rlim);
    }
849
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
850

Jim Blandy's avatar
Jim Blandy committed
851 852 853 854
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
855

Jim Blandy's avatar
Jim Blandy committed
856
#ifndef SYSTEM_MALLOC
857 858
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
859

860
  /* Call malloc at least once, to run malloc_initialize_hook.
861 862
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
863

Jim Blandy's avatar
Jim Blandy committed
864 865
#endif	/* not SYSTEM_MALLOC */

866
#if defined (MSDOS) || defined (WINDOWSNT)
867 868 869
  /* We do all file input/output as binary files.  When we need to translate
     newlines, we do that manually.  */
  _fmode = O_BINARY;
870
#endif /* MSDOS || WINDOWSNT */
871

872
#ifdef MSDOS
873 874 875 876 877 878 879
  if (!isatty (fileno (stdin)))
    setmode (fileno (stdin), O_BINARY);
  if (!isatty (fileno (stdout)))
    {
      fflush (stdout);
      setmode (fileno (stdout), O_BINARY);
    }
880 881
#endif /* MSDOS */

882 883 884 885 886 887 888 889 890 891 892 893 894 895
  /* 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
896 897
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
898
  /* Handle the -t switch, which specifies filename to use as terminal.  */
899 900 901 902 903 904
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
905 906 907
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
908
	  if (result < 0 || dup (0) < 0)
909 910
	    {
	      char *errstring = strerror (errno);
911
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
912 913 914 915
	      exit (1);
	    }
	  if (! isatty (0))
	    {
916
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
917 918 919
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
920
#ifdef HAVE_WINDOW_SYSTEM
921
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
922
#endif
923 924 925 926 927
	}
      else
	break;
    }

928
  /* Command line option --no-windows is deprecated and thus not mentioned
Paul Eggert's avatar
Paul Eggert committed
929
     in the manual and usage information.  */
930 931
  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
932
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
933

Karl Heuer's avatar
Karl Heuer committed
934
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
935
  noninteractive = 0;
936
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
937 938 939 940
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
941 942 943
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
944
      /* Convert --script to -scriptload, un-skip it, and sort again
945
	 so that it will be handled in proper sequence.  */
946
      /* FIXME broken for --script=FILE - is that supposed to work?  */
947
      argv[skip_args - 1] = (char *) "-scriptload";
948 949 950
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
951

Pavel Janík's avatar
Pavel Janík committed
952
  /* Handle the --help option, which gives a usage message.  */
953
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
954
    {
Kenichi Handa's avatar
Kenichi Handa committed
955 956
      printf (USAGE1, argv[0], USAGE2);
      printf (USAGE3);
957
      printf (USAGE4);
Karl Heuer's avatar
Karl Heuer committed
958
      exit (0);
Jim Blandy's avatar
Jim Blandy committed
959 960
    }

961 962
  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
963
    {
964
#ifndef DOS_NT
965 966 967 968 969
      pid_t f;

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

970 971 972 973 974 975 976 977 978 979 980 981 982 983
	 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.

984 985 986 987 988 989 990 991 992 993
	 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);
	}

994
#ifndef DAEMON_MUST_EXEC
995 996 997 998
#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");
999
#endif /* USE_GTK */
1000
      f = fork ();
1001
#else /* DAEMON_MUST_EXEC */
1002 1003 1004 1005
      if (!dname_arg || !strchr (dname_arg, '\n'))
	  f = fork ();  /* in orig */
      else
	  f = 0;  /* in exec'd */
1006
#endif /* !DAEMON_MUST_EXEC */
1007
      if (f > 0)
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
	{
	  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);
	    }
1027 1028 1029 1030 1031
	  else if (retval == 0)
	    {
	      fprintf (stderr, "Error: server did not start correctly\n");
	      exit (1);
	    }
1032 1033 1034 1035

	  close (daemon_pipe[0]);
	  exit (0);
	}
1036 1037 1038
      if (f < 0)
	{
	  fprintf (stderr, "Cannot fork!\n");
1039
	  exit (1);
1040 1041
	}

1042
#ifdef DAEMON_MUST_EXEC
1043
      {
Adrian Robert's avatar
Adrian Robert committed
1044
        /* In orig process, forked as child, OR in exec'd. */
1045
        if (!dname_arg || !strchr (dname_arg, '\n'))
Adrian Robert's avatar
Adrian Robert committed
1046
          {  /* In orig, child: now exec w/special daemon name. */
1047
            char fdStr[80];
1048 1049 1050 1051
	    int fdStrlen =
	      snprintf (fdStr, sizeof fdStr,
			"--daemon=\n%d,%d\n%s", daemon_pipe[0],
			daemon_pipe[1], dname_arg ? dname_arg : "");
1052

1053
	    if (! (0 <= fdStrlen && fdStrlen < sizeof fdStr))
1054 1055 1056 1057 1058 1059 1060 1061
              {
                fprintf (stderr, "daemon: child name too long\n");
                exit (1);
              }

            argv[skip_args] = fdStr;

            execv (argv[0], argv);
1062
            fprintf (stderr, "emacs daemon: exec failed: %d\n", errno);
1063 1064 1065
            exit (1);
          }

Adrian Robert's avatar
Adrian Robert committed
1066
        /* In exec'd: parse special dname into pipe and name info. */
1067 1068 1069 1070
        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");
Juanma Barranquero's avatar
Juanma Barranquero committed
1071
            exit (1);
1072 1073 1074 1075
          }
        dname_arg2[0] = '\0';
        sscanf (dname_arg, "\n%d,%d\n%s", &(daemon_pipe[0]), &(daemon_pipe[1]),
                dname_arg2);
1076
        dname_arg = *dname_arg2 ? dname_arg2 : NULL;
1077
      }
1078
#endif /* DAEMON_MUST_EXEC */
1079

1080 1081
      if (dname_arg)
       	daemon_name = xstrdup (dname_arg);
1082 1083
      /* Close unused reading end of the pipe.  */
      close (daemon_pipe[0]);
1084 1085 1086 1087
      /* Make sur