emacs.c 74.1 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Fully extensible Emacs, running on Unix, intended for GNU.
2

Paul Eggert's avatar
Paul Eggert committed
3
Copyright (C) 1985-1987, 1993-1995, 1997-1999, 2001-2016 Free Software
Paul Eggert's avatar
Paul Eggert committed
4
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

Paul Eggert's avatar
Paul Eggert committed
21
#define INLINE EXTERN_INLINE
22
#include <config.h>
Paul Eggert's avatar
Paul Eggert committed
23

Jim Blandy's avatar
Jim Blandy committed
24
#include <errno.h>
25
#include <fcntl.h>
Jim Blandy's avatar
Jim Blandy committed
26 27 28 29
#include <stdio.h>

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

Paul Eggert's avatar
Paul Eggert committed
32
#include <close-stream.h>
33

34
#define MAIN_PROGRAM
35 36
#include "lisp.h"

37 38
#ifdef WINDOWSNT
#include <fcntl.h>
39
#include <sys/socket.h>
40
#include <mbstring.h>
41
#include "w32.h"
Daniel Colascione's avatar
Daniel Colascione committed
42 43 44
#include "w32heap.h"
#endif

45
#if defined WINDOWSNT || defined HAVE_NTGUI
Daniel Colascione's avatar
Daniel Colascione committed
46 47
#include "w32select.h"
#include "w32font.h"
48
#include "w32common.h"
Daniel Colascione's avatar
Daniel Colascione committed
49 50
#endif

51
#if defined CYGWIN
Daniel Colascione's avatar
Daniel Colascione committed
52
#include "cygw32.h"
53 54
#endif

55 56 57 58
#ifdef MSDOS
#include <binary-io.h>
#endif

59 60 61 62
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

63
#include "coding.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
64
#include "intervals.h"
65
#include "character.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
66
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
67
#include "window.h"
Paul Eggert's avatar
Paul Eggert committed
68
#include "xwidget.h"
69
#include "atimer.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
70
#include "blockinput.h"
71
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
72
#include "process.h"
73
#include "frame.h"
74
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
75
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
76
#include "keymap.h"
Paul Eggert's avatar
Paul Eggert committed
77 78 79 80
#include "category.h"
#include "charset.h"
#include "composite.h"
#include "dispextern.h"
Paul Eggert's avatar
Paul Eggert committed
81
#include "regex.h"
Paul Eggert's avatar
Paul Eggert committed
82
#include "syntax.h"
83
#include "sysselect.h"
Paul Eggert's avatar
Paul Eggert committed
84
#include "systime.h"
85
#include "puresize.h"
Jim Blandy's avatar
Jim Blandy committed
86

Ted Zlatanov's avatar
Ted Zlatanov committed
87 88
#include "gnutls.h"

89 90 91 92 93 94
#if (defined PROFILING \
     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
# include <sys/gmon.h>
extern void moncontrol (int mode);
#endif

95 96 97 98
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

99 100 101 102
#if HAVE_WCHAR_H
# include <wchar.h>
#endif

103 104 105 106 107
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

108 109 110 111
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Glenn Morris's avatar
Glenn Morris committed
112
static const char emacs_version[] = PACKAGE_VERSION;
113
static const char emacs_copyright[] = COPYRIGHT;
Glenn Morris's avatar
Glenn Morris committed
114
static const char emacs_bugreport[] = PACKAGE_BUGREPORT;
115

116 117
/* 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
118

119 120 121 122 123
#ifdef WINDOWSNT
/* Cache for externally loaded libraries.  */
Lisp_Object Vlibrary_cache;
#endif

124 125 126 127
/* 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
128

129 130 131
/* Set to true if this instance of Emacs might dump.  */
bool might_dump;

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

136
extern void malloc_enable_thread (void);
137
extern void report_sheap_usage (int);
138

139
/* If true, Emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
140
   but instead should use the virtual terminal under which it was started.  */
141
bool inhibit_window_system;
Jim Blandy's avatar
Jim Blandy committed
142

143
/* If true, a filter or a sentinel is running.  Tested to save the match
Pavel Janík's avatar
Pavel Janík committed
144
   data on the first attempt to change it inside asynchronous code.  */
145
bool running_asynch_code;
146

Juanma Barranquero's avatar
Juanma Barranquero committed
147
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
148 149
/* If true, -d was specified, meaning we're using some window system.  */
bool display_arg;
Jim Blandy's avatar
Jim Blandy committed
150 151 152 153 154 155
#endif

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

156
#ifdef GNU_LINUX
157
/* The gap between BSS end and heap start as far as we can tell.  */
158 159
static uprintmax_t heap_bss_diff;
#endif
160

161 162 163 164 165 166 167 168 169 170 171 172
/* 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. */
173
#if defined NS_IMPL_COCOA || (defined HAVE_NTGUI && defined CYGWIN)
174 175 176
# define DAEMON_MUST_EXEC
#endif

177 178
/* True means running Emacs without interactive terminal.  */
bool noninteractive;
Jim Blandy's avatar
Jim Blandy committed
179

180 181
/* True means remove site-lisp directories from load-path.  */
bool no_site_lisp;
182

183 184
/* Name for the server started by the daemon.*/
static char *daemon_name;
185

186
#ifndef WINDOWSNT
187 188
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
189
int daemon_pipe[2];
190 191 192
#else
HANDLE w32_daemon_event;
#endif
193

194 195 196
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
197

198
static void sort_args (int argc, char **argv);
199
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
200

Paul Eggert's avatar
Paul Eggert committed
201
/* C99 needs each string to be at most 4095 characters, and the usage
Kenichi Handa's avatar
Kenichi Handa committed
202
   strings below are split to not overflow this limit.  */
Paul Eggert's avatar
Paul Eggert committed
203 204
static char const *const usage_message[] =
  { "\
Gerd Moellmann's avatar
Gerd Moellmann committed
205 206 207 208 209
\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\
210
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
211 212 213 214
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Paul Eggert's avatar
Paul Eggert committed
215 216
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
217
--batch                     do not do interactive display; implies -q\n\
218
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
219
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
220 221
--debug-init                enable Emacs Lisp debugger for init file\n\
--display, -d DISPLAY       use X server DISPLAY\n\
Paul Eggert's avatar
Paul Eggert committed
222 223
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
224 225
--no-desktop                do not load a saved desktop\n\
--no-init-file, -q          load neither ~/.emacs nor default.el\n\
226
--no-loadup, -nl            do not load loadup.el into bare Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
227
--no-site-file              do not load site-start.el\n\
228
--no-x-resources            do not load X resources\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\
Paul Eggert's avatar
Paul Eggert committed
232 233
",
    "\
234 235
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
236
                              --no-x-resources\n\
Kenichi Handa's avatar
Kenichi Handa committed
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\
Paul Eggert's avatar
Paul Eggert committed
240 241 242
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
243 244
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
245
FILE                    visit FILE using find-file\n\
246 247
+LINE                   go to line LINE in next FILE\n\
+LINE:COLUMN            go to line LINE, column COLUMN, in next FILE\n\
248
--directory, -L DIR     prepend DIR to load-path (with :DIR, append DIR)\n\
Kenichi Handa's avatar
Kenichi Handa committed
249 250
--eval EXPR             evaluate Emacs Lisp expression EXPR\n\
--execute EXPR          evaluate Emacs Lisp expression EXPR\n\
Paul Eggert's avatar
Paul Eggert committed
251 252
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
253 254 255 256 257 258 259
--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\
Paul Eggert's avatar
Paul Eggert committed
260 261 262
\n\
",
    "\
263
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
264
\n\
Kenichi Handa's avatar
Kenichi Handa committed
265
--background-color, -bg COLOR   window background color\n\
266 267
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
268 269
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
Paul Eggert's avatar
Paul Eggert committed
270 271
",
    "\
272
--color, --color=MODE           override color mode for character terminals;\n\
273 274
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
275 276 277 278
                                  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\
Paul Eggert's avatar
Paul Eggert committed
279 280
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
281
--fullheight, -fh               make the first frame high as the screen\n\
282
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
283
--fullwidth, -fw                make the first frame wide as the screen\n\
284
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
285
--geometry, -g GEOMETRY         window geometry\n\
Paul Eggert's avatar
Paul Eggert committed
286 287
",
    "\
Jan Djärv's avatar
Jan Djärv committed
288
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
289 290 291 292 293
--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\
Paul Eggert's avatar
Paul Eggert committed
294 295
",
    "\
296
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
297 298 299 300
--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
301
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
302 303
--help                          display this help and exit\n\
--version                       output version information and exit\n\
Paul Eggert's avatar
Paul Eggert committed
304 305 306
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
307 308 309 310 311
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\
312
the operation of Emacs.  See the main documentation.\n\
313
\n\
Glenn Morris's avatar
Glenn Morris committed
314
Report bugs to " PACKAGE_BUGREPORT ".  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
315
section of the Emacs manual or the file BUGS.\n"
Paul Eggert's avatar
Paul Eggert committed
316
  };
Gerd Moellmann's avatar
Gerd Moellmann committed
317

Jim Blandy's avatar
Jim Blandy committed
318

319 320
/* True if handling a fatal error already.  */
bool fatal_error_in_progress;
321

322 323 324
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
325 326
#endif

327 328 329 330 331 332 333
#if !HAVE_SETLOCALE
static char *
setlocale (int cat, char const *locale)
{
  return 0;
}
#endif
334

335 336 337 338 339 340 341 342 343 344 345 346 347
/* True if the current system locale uses UTF-8 encoding.  */
static bool
using_utf8 (void)
{
#ifdef HAVE_WCHAR_H
  wchar_t wc;
  mbstate_t mbs = { 0 };
  return mbrtowc (&wc, "\xc4\x80", 2, &mbs) == 2 && wc == 0x100;
#else
  return false;
#endif
}

348

349 350 351
/* Report a fatal error due to signal SIG, output a backtrace of at
   most BACKTRACE_LIMIT lines, and exit.  */
_Noreturn void
352
terminate_due_to_signal (int sig, int backtrace_limit)
Jim Blandy's avatar
Jim Blandy committed
353 354
{
  signal (sig, SIG_DFL);
355

356
  if (attempt_orderly_shutdown_on_fatal_signal)
357
    {
358 359 360 361 362 363 364 365 366 367 368 369
      /* If fatal error occurs in code below, avoid infinite recursion.  */
      if (! fatal_error_in_progress)
        {
          fatal_error_in_progress = 1;

          totally_unblock_input ();
          if (sig == SIGTERM || sig == SIGHUP || sig == SIGINT)
            Fkill_emacs (make_number (sig));

          shut_down_emacs (sig, Qnil);
          emacs_backtrace (backtrace_limit);
        }
370
    }
Jim Blandy's avatar
Jim Blandy committed
371

372
  /* Signal the same code; this time it will really be fatal.
373 374
     Since we're in a signal handler, the signal is blocked, so we
     have to unblock it if we want to really receive it.  */
375
#ifndef MSDOS
Paul Eggert's avatar
Paul Eggert committed
376 377 378
  {
    sigset_t unblocked;
    sigemptyset (&unblocked);
379
    sigaddset (&unblocked, sig);
Paul Eggert's avatar
Paul Eggert committed
380 381
    pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
  }
382
#endif
383

384
  emacs_raise (sig);
385 386 387

  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Jim Blandy's avatar
Jim Blandy committed
388 389
}

Pavel Janík's avatar
Pavel Janík committed
390
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
391

Andreas Schwab's avatar
Andreas Schwab committed
392
static void
393
init_cmdargs (int argc, char **argv, int skip_args, char *original_pwd)
Jim Blandy's avatar
Jim Blandy committed
394
{
395
  int i;
396
  Lisp_Object name, dir, handler;
397
  ptrdiff_t count = SPECPDL_INDEX ();
398
  Lisp_Object raw_name;
399
  AUTO_STRING (slash_colon, "/:");
Jim Blandy's avatar
Jim Blandy committed
400

401 402 403
  initial_argv = argv;
  initial_argc = argc;

404 405 406 407 408 409 410 411 412 413 414 415
#ifdef WINDOWSNT
  /* Must use argv[0] converted to UTF-8, as it begets many standard
     file and directory names.  */
  {
    char argv0[MAX_UTF8_PATH];

    if (filename_from_ansi (argv[0], argv0) == 0)
      raw_name = build_unibyte_string (argv0);
    else
      raw_name = build_unibyte_string (argv[0]);
  }
#else
416
  raw_name = build_unibyte_string (argv[0]);
417
#endif
418 419 420

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
421 422
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
423
    raw_name = concat2 (slash_colon, raw_name);
424 425 426 427

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

428 429 430 431 432 433
  /* 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,
434
		       Vexec_suffixes, &found, make_number (X_OK), false);
435
      if (yes == 1)
436 437 438
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
439 440
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
441
	    found = concat2 (slash_colon, found);
442 443
	  Vinvocation_directory = Ffile_name_directory (found);
	}
444
    }
445

446 447
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
448 449
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
450
    {
451 452 453
      Lisp_Object odir =
	original_pwd ? build_unibyte_string (original_pwd) : Qnil;

454 455
      Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, odir);
    }
456

457 458 459 460 461
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
462 463 464 465 466 467 468 469 470 471
#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
472 473 474
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
475
	  Lisp_Object tem, lib_src_exists;
476 477
	  Lisp_Object etc_exists, info_exists;

478 479 480 481 482
	  /* 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);
483

484
#ifdef MSDOS
485 486 487 488 489
	  /* 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);
490 491 492
#else
	  info_exists = Qnil;
#endif
493 494

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
495
	    {
496 497 498
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
499
		{
500 501 502
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
503 504 505 506
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
507 508
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
509

510 511 512

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
513 514
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
515 516 517
#else
	  info_exists = Qnil;
#endif
518 519

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
520
	    {
521 522 523
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
524
		{
525 526 527 528
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
529 530 531 532 533 534 535 536
		}
	    }

	  /* 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))
	    {
537
	      name = Fexpand_file_name (tem, dir);
538 539 540 541 542 543 544
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
545 546 547 548 549
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
550 551 552
	/* 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
553
	Vcommand_line_args
554
	  = Fcons (build_unibyte_string (argv[i]), Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
555
    }
556 557

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
558
}
559 560

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
561 562
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
563
  (void)
564 565 566 567
{
  return Fcopy_sequence (Vinvocation_name);
}

568
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
569 570
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
571
  (void)
572 573 574 575
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
576

Karl Heuer's avatar
Karl Heuer committed
577 578 579 580 581 582 583 584 585
/* 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.  */
586

587
static bool
588 589
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
590
{
591
  char *p = NULL;
592
  ptrdiff_t arglen;
593 594 595 596 597 598 599
  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
600 601 602 603 604 605 606 607 608 609 610 611 612
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
613
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
614
	    ? p - arg : strlen (arg));
615
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
    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;
    }
}

Paul Eggert's avatar
Paul Eggert committed
640 641 642 643 644 645 646
/* Close standard output and standard error, reporting any write
   errors as best we can.  This is intended for use with atexit.  */
static void
close_output_streams (void)
{
  if (close_stream (stdout) != 0)
    {
647
      emacs_perror ("Write error to standard output");
Paul Eggert's avatar
Paul Eggert committed
648 649 650 651 652 653
      _exit (EXIT_FAILURE);
    }

   if (close_stream (stderr) != 0)
     _exit (EXIT_FAILURE);
}
654

655 656
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
657
main (int argc, char **argv)
658
{
659
  Lisp_Object dummy;
660
  char stack_bottom_variable;
661
  bool do_initial_setlocale;
662
  bool dumping;
663 664 665 666
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
667
  bool no_loadup = 0;
668
  char *junk = 0;
669
  char *dname_arg = 0;
670
#ifdef DAEMON_MUST_EXEC
671 672
  char dname_arg2[80];
#endif
673
  char *ch_to_dir = 0;
674

675 676 677
  /* If we use --chdir, this records the original directory.  */
  char *original_pwd = 0;

678 679
  stack_base = &dummy;

680 681 682 683
#ifndef CANNOT_DUMP
  might_dump = !initialized;
#endif

684
#ifdef GNU_LINUX
685 686
  if (!initialized)
    {
Paul Eggert's avatar
Paul Eggert committed
687 688
      char *heap_start = my_heap_start ();
      heap_bss_diff = heap_start - max (my_endbss, my_endbss_static);
689
    }
690
#endif
691

692 693 694 695 696
#if defined WINDOWSNT || defined HAVE_NTGUI
  /* Set global variables used to detect Windows version.  Do this as
     early as possible.  (unexw32.c calls this function as well, but
     the additional call here is harmless.) */
  cache_system_info ();
697 698 699 700 701 702
#ifdef WINDOWSNT
  /* On Windows 9X, we have to load UNICOWS.DLL as early as possible,
     to have non-stub implementations of APIs we need to convert file
     names between UTF-8 and the system's ANSI codepage.  */
  maybe_load_unicows_dll ();
#endif
703 704 705
  /* This has to be done before module_init is called below, so that
     the latter could use the thread ID of the main thread.  */
  w32_init_main_thread ();
706 707
#endif

708 709 710 711 712
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

713 714
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
715 716 717 718
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

Paul Eggert's avatar
Paul Eggert committed
719 720
  atexit (close_output_streams);

721 722 723 724
#ifdef HAVE_MODULES
  module_init ();
#endif

725
  sort_args (argc, argv);
726 727
  argc = 0;
  while (argv[argc]) argc++;
728

729
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
730
    {
731 732
      const char *version, *copyright;
      if (initialized)
733
	{
734 735 736 737 738
	  Lisp_Object tem, tem2;
	  tem = Fsymbol_value (intern_c_string ("emacs-version"));
	  tem2 = Fsymbol_value (intern_c_string ("emacs-copyright"));
	  if (!STRINGP (tem))
	    {
739
	      fprintf (stderr, "Invalid value of 'emacs-version'\n");
740 741 742 743
	      exit (1);
	    }
	  if (!STRINGP (tem2))
	    {
744
	      fprintf (stderr, "Invalid value of 'emacs-copyright'\n");
745 746 747 748
	      exit (1);
	    }
	  else
	    {
749 750
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
751
	    }
752
	}
753 754
      else
	{
755 756
	  version = emacs_version;
	  copyright = emacs_copyright;
757
	}
758
      printf ("%s %s\n", PACKAGE_NAME, version);
759
      printf ("%s\n", copyright);
760 761
      printf ("%s comes with ABSOLUTELY NO WARRANTY.\n", PACKAGE_NAME);
      printf ("You may redistribute copies of %s\n", PACKAGE_NAME);
762 763 764 765
      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);
766
    }
767 768

  if (argmatch (argv, argc, "-chdir", "--chdir", 4, &ch_to_dir, &skip_args))
769
    {
770 771 772 773 774 775 776 777
#ifdef WINDOWSNT
      /* argv[] array is kept in its original ANSI codepage encoding,
	 we need to convert to UTF-8, for chdir to work.  */
      char newdir[MAX_UTF8_PATH];

      filename_from_ansi (ch_to_dir, newdir);
      ch_to_dir = newdir;
#endif
778
      original_pwd = get_current_dir_name ();
779
      if (chdir (ch_to_dir) != 0)
780 781 782 783 784 785
        {
          fprintf (stderr, "%s: Can't chdir to %s: %s\n",
                   argv[0], ch_to_dir, strerror (errno));
          exit (1);
        }
    }
786

787 788
  dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
			     || strcmp (argv[argc - 1], "bootstrap") == 0);
789

790
#ifdef HAVE_PERSONALITY_LINUX32
791
  if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
792
    {
793
      /* Set this so we only do this once.  */
794
      xputenv ("EMACS_HEAP_EXEC=true");
795

796 797
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
798
#define ADD_NO_RANDOMIZE 0x0040000
799
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
800 801
#undef  ADD_NO_RANDOMIZE

802
      execvp (argv[0], argv);
803

804
      /* If the exec fails, try to dump anyway.  */
805
      emacs_perror (argv[0]);
806 807 808
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

809 810 811 812 813 814 815
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK) && !defined (CYGWIN)
  /* 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.  And it's not needed on Cygwin, since emacs
     is built with an 8MB stack.  Moreover, the setrlimit call can
     cause problems on Cygwin
     (https://www.cygwin.com/ml/cygwin/2015-07/msg00096.html).  */
816 817 818 819 820
  if (1
#ifndef CANNOT_DUMP
      && (!noninteractive || initialized)
#endif
      && !getrlimit (RLIMIT_STACK, &rlim))
821
    {
822
      long newlim;
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 and not CYGWIN */
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

856 857
  emacs_backtrace (-1);

858
#if !defined SYSTEM_MALLOC && !defined HYBRID_MALLOC
859 860
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
861

862
  /* Call malloc at least once, to run malloc_initialize_hook.
863 864
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
865

866
#endif	/* not SYSTEM_MALLOC and not HYBRID_MALLOC */
Jim Blandy's avatar
Jim Blandy committed
867

868
#ifdef MSDOS
869 870 871
  SET_BINARY (fileno (stdin));
  fflush (stdout);
  SET_BINARY (fileno (stdout));
872 873
#endif /* MSDOS */

874 875 876 877 878 879 880 881 882 883 884 885 886
  /* 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, "");
887
  text_quoting_flag = using_utf8 ();
888

Jim Blandy's avatar
Jim Blandy committed
889 890
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
891
  /* Handle the -t switch, which specifies filename to use as terminal.  */
892 893 894 895 896 897
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
	  int result;
898 899 900
	  emacs_close (0);
	  emacs_close (1);
	  result = emacs_open (term, O_RDWR, 0);
901
	  if (result < 0 || fcntl (0, F_DUPFD_CLOEXEC, 1) < 0)
902 903
	    {
	      char *errstring = strerror (errno);
904
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
905 906 907 908
	      exit (1);
	    }
	  if (! isatty (0))
	    {
909
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
910 911 912
	      exit (1);
	    }
	  fprintf (stderr, "Using %s\n", term);
913
#ifdef HAVE_WINDOW_SYSTEM
914
	  inhibit_window_system = 1; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
915
#endif
916 917 918 919 920
	}
      else
	break;
    }

921
  /* Command line option --no-windows is deprecated and thus not mentioned
Paul Eggert's avatar
Paul Eggert committed
922
     in the manual and usage information.  */
923 924
  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
925
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
926

Karl Heuer's avatar
Karl Heuer committed
927
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
928
  noninteractive = 0;
929
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
930 931 932 933
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
934 935 936
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
937
      /* Convert --script to -scriptload, un-skip it, and sort again
938
	 so that it will be handled in proper sequence.  */
939
      /* FIXME broken for --script=FILE - is that supposed to work?  */
940
      argv[skip_args - 1] = (char *) "-scriptload";
941 942 943
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
944

Pavel Janík's avatar
Pavel Janík committed
945
  /* Handle the --help option, which gives a usage message.  */
946
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
947
    {
Paul Eggert's avatar
Paul Eggert committed
948 949
      int i;
      printf ("Usage: %s [OPTION-OR-FILENAME]...\n", argv[0]);
950
      for (i = 0; i < ARRAYELTS (usage_message); i++)
Paul Eggert's avatar
Paul Eggert committed
951
	fputs (usage_message[i], stdout);
Karl Heuer's avatar
Karl Heuer committed
952
      exit (0);
Jim Blandy's avatar
Jim Blandy committed
953 954
    }

955
#ifndef WINDOWSNT
Paul Eggert's avatar
Paul Eggert committed
956 957
  /* Make sure IS_DAEMON starts up as false.  */
  daemon_pipe[1] = 0;
958 959 960
#else
  w32_daemon_event = NULL;
#endif
Paul Eggert's avatar
Paul Eggert committed
961

962 963
  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
964
    {
965
#ifndef DOS_NT
966 967 968 969 970
      pid_t f;

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

971 972 973 974 975 976 977 978 979 980 981 982 983 984
	 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.

985 986 987 988
	 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.  */
989
      if (emacs_pipe (daemon_pipe) != 0)
990 991 992 993 994
	{
	  fprintf (stderr, "Cannot pipe!\n");
	  exit (1);
	}

995
#ifndef DAEMON_MUST_EXEC
996 997 998 999
#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");
1000
#endif /* USE_GTK */
1001
      f = fork ();
1002
#else /* DAEMON_MUST_EXEC */
1003 1004 1005 1006
      if (!dname_arg || !strchr (dname_arg, '\n'))
	  f = fork ();  /* in orig */
      else
	  f = 0;  /* in exec'd */
1007
#endif /* !DAEMON_MUST_EXEC */
1008
      if (f > 0)
1009 1010 1011 1012 1013
	{
	  int retval;
	  char buf[1];

	  /* Close unused writing end of the pipe.  */
1014
	  emacs_close (daemon_pipe[1]);
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027

	  /* 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);
	    }
1028 1029 1030 1031 1032
	  else if (retval == 0)
	    {
	      fprintf (stderr, "Error: server did not start correctly\n");
	      exit (1);
	    }
1033

1034
	  emacs_close (daemon_pipe[0]);
1035 1036
	  exit (0);
	}
1037 1038
      if (f < 0)
	{
1039 1040
	  emacs_perror ("fork");
	  exit (EXIT_CANCELED);
1041 1042
	}

1043
#ifdef DAEMON_MUST_EXEC
1044
      {
Adrian Robert's avatar
Adrian Robert committed
1045
        /* In orig process, forked as child, OR in exec'd. */
1046
        if (!dname_arg || !strchr (dname_arg, '\n'))
Adrian Robert's avatar
Adrian Robert committed
1047
          {  /* In orig, child: now exec w/special daemon name. */
1048
            char fdStr[80];
1049 1050 1051 1052
	    int fdStrlen =
	      snprintf (fdStr, sizeof fdStr,
			"--daemon=\n%d,%d\n%s", daemon_pipe[0],
			daemon_pipe[1], dname_arg ? dname_arg : "");
1053

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

            argv[skip_args] = fdStr;

1062 1063
	    fcntl (daemon_pipe[0], F_SETFD, 0);
	    fcntl (daemon_pipe[1], F_SETFD, 0);
1064
            execvp (argv[0], argv);