emacs.c 75.6 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
#ifdef HAVE_LIBSYSTEMD
60 61 62
# include <systemd/sd-daemon.h>
# include <sys/socket.h>
#endif
63

64 65 66 67
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

68
#include "coding.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
69
#include "intervals.h"
70
#include "character.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
71
#include "buffer.h"
Stefan Monnier's avatar
Stefan Monnier committed
72
#include "window.h"
Paul Eggert's avatar
Paul Eggert committed
73
#include "xwidget.h"
74
#include "atimer.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
75
#include "blockinput.h"
76
#include "syssignal.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
77
#include "process.h"
78
#include "frame.h"
79
#include "termhooks.h"
Andreas Schwab's avatar
Andreas Schwab committed
80
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
81
#include "keymap.h"
Paul Eggert's avatar
Paul Eggert committed
82 83 84 85
#include "category.h"
#include "charset.h"
#include "composite.h"
#include "dispextern.h"
Paul Eggert's avatar
Paul Eggert committed
86
#include "regex.h"
87
#include "sheap.h"
Paul Eggert's avatar
Paul Eggert committed
88
#include "syntax.h"
89
#include "sysselect.h"
Paul Eggert's avatar
Paul Eggert committed
90
#include "systime.h"
91
#include "puresize.h"
Jim Blandy's avatar
Jim Blandy committed
92

Ted Zlatanov's avatar
Ted Zlatanov committed
93 94
#include "gnutls.h"

95 96 97 98 99 100
#if (defined PROFILING \
     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
# include <sys/gmon.h>
extern void moncontrol (int mode);
#endif

101 102 103 104
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

105 106 107 108
#if HAVE_WCHAR_H
# include <wchar.h>
#endif

109 110 111 112 113
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

114 115 116 117
#ifdef HAVE_PERSONALITY_LINUX32
#include <sys/personality.h>
#endif

Glenn Morris's avatar
Glenn Morris committed
118
static const char emacs_version[] = PACKAGE_VERSION;
119
static const char emacs_copyright[] = COPYRIGHT;
Glenn Morris's avatar
Glenn Morris committed
120
static const char emacs_bugreport[] = PACKAGE_BUGREPORT;
121

122 123
/* 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
124

125 126 127 128 129
#ifdef WINDOWSNT
/* Cache for externally loaded libraries.  */
Lisp_Object Vlibrary_cache;
#endif

130 131 132 133
/* 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
134

135
/* Set to true if this instance of Emacs might dump.  */
136 137 138
#ifndef DOUG_LEA_MALLOC
static
#endif
139 140
bool might_dump;

141 142 143 144
#ifdef DARWIN_OS
extern void unexec_init_emacs_zone (void);
#endif

145
/* If true, Emacs should not attempt to use a window-specific code,
Pavel Janík's avatar
Pavel Janík committed
146
   but instead should use the virtual terminal under which it was started.  */
147
bool inhibit_window_system;
Jim Blandy's avatar
Jim Blandy committed
148

149
/* If true, a filter or a sentinel is running.  Tested to save the match
Pavel Janík's avatar
Pavel Janík committed
150
   data on the first attempt to change it inside asynchronous code.  */
151
bool running_asynch_code;
152

Juanma Barranquero's avatar
Juanma Barranquero committed
153
#if defined (HAVE_X_WINDOWS) || defined (HAVE_NS)
154 155
/* If true, -d was specified, meaning we're using some window system.  */
bool display_arg;
Jim Blandy's avatar
Jim Blandy committed
156 157 158 159 160 161
#endif

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

162
#ifdef GNU_LINUX
163
/* The gap between BSS end and heap start as far as we can tell.  */
164 165
static uprintmax_t heap_bss_diff;
#endif
166

167 168 169 170 171 172 173 174 175 176 177 178
/* 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. */
179
#if defined NS_IMPL_COCOA || (defined HAVE_NTGUI && defined CYGWIN)
180 181 182
# define DAEMON_MUST_EXEC
#endif

183 184
/* True means running Emacs without interactive terminal.  */
bool noninteractive;
Jim Blandy's avatar
Jim Blandy committed
185

186 187
/* True means remove site-lisp directories from load-path.  */
bool no_site_lisp;
188

189 190 191
/* True means put details like time stamps into builds.  */
bool build_details;

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

195
#ifndef WINDOWSNT
196 197
/* Pipe used to send exit notification to the daemon parent at
   startup.  */
198
int daemon_pipe[2];
199 200 201
#else
HANDLE w32_daemon_event;
#endif
202

203 204 205
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
206

207
static void sort_args (int argc, char **argv);
208
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
209

Paul Eggert's avatar
Paul Eggert committed
210
/* C99 needs each string to be at most 4095 characters, and the usage
Kenichi Handa's avatar
Kenichi Handa committed
211
   strings below are split to not overflow this limit.  */
Paul Eggert's avatar
Paul Eggert committed
212 213
static char const *const usage_message[] =
  { "\
Gerd Moellmann's avatar
Gerd Moellmann committed
214 215 216 217 218
\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\
219
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
220 221 222 223
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Paul Eggert's avatar
Paul Eggert committed
224 225
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
226
--batch                     do not do interactive display; implies -q\n\
227
--chdir DIR                 change to directory DIR\n\
Glenn Morris's avatar
Glenn Morris committed
228
--daemon                    start a server in the background\n\
Kenichi Handa's avatar
Kenichi Handa committed
229 230
--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
231 232
",
    "\
233
--no-build-details          do not add build details such as time stamps\n\
Kenichi Handa's avatar
Kenichi Handa committed
234 235
--no-desktop                do not load a saved desktop\n\
--no-init-file, -q          load neither ~/.emacs nor default.el\n\
236
--no-loadup, -nl            do not load loadup.el into bare Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
237
--no-site-file              do not load site-start.el\n\
238
--no-x-resources            do not load X resources\n\
239
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
240
--no-splash                 do not display a splash screen on startup\n\
241
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
Paul Eggert's avatar
Paul Eggert committed
242 243
",
    "\
244 245
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
246
                              --no-x-resources\n\
Kenichi Handa's avatar
Kenichi Handa committed
247 248 249
--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
250 251 252
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
253 254
Action options:\n\
\n\
Kenichi Handa's avatar
Kenichi Handa committed
255
FILE                    visit FILE using find-file\n\
256 257
+LINE                   go to line LINE in next FILE\n\
+LINE:COLUMN            go to line LINE, column COLUMN, in next FILE\n\
258
--directory, -L DIR     prepend DIR to load-path (with :DIR, append DIR)\n\
Kenichi Handa's avatar
Kenichi Handa committed
259 260
--eval EXPR             evaluate Emacs Lisp expression EXPR\n\
--execute EXPR          evaluate Emacs Lisp expression EXPR\n\
Paul Eggert's avatar
Paul Eggert committed
261 262
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
263 264 265 266 267 268 269
--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
270 271 272
\n\
",
    "\
273
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
274
\n\
Kenichi Handa's avatar
Kenichi Handa committed
275
--background-color, -bg COLOR   window background color\n\
276 277
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
278 279
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
Paul Eggert's avatar
Paul Eggert committed
280 281
",
    "\
282
--color, --color=MODE           override color mode for character terminals;\n\
283 284
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
285 286 287 288
                                  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
289 290
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
291
--fullheight, -fh               make the first frame high as the screen\n\
292
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
293
--fullwidth, -fw                make the first frame wide as the screen\n\
294
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
295
--geometry, -g GEOMETRY         window geometry\n\
Paul Eggert's avatar
Paul Eggert committed
296 297
",
    "\
Jan Djärv's avatar
Jan Djärv committed
298
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
299 300 301 302 303
--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
304 305
",
    "\
306
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
307 308 309 310
--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
311
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
312 313
--help                          display this help and exit\n\
--version                       output version information and exit\n\
Paul Eggert's avatar
Paul Eggert committed
314 315 316
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
317 318 319 320 321
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\
322
the operation of Emacs.  See the main documentation.\n\
323
\n\
Glenn Morris's avatar
Glenn Morris committed
324
Report bugs to " PACKAGE_BUGREPORT ".  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
325
section of the Emacs manual or the file BUGS.\n"
Paul Eggert's avatar
Paul Eggert committed
326
  };
Gerd Moellmann's avatar
Gerd Moellmann committed
327

Jim Blandy's avatar
Jim Blandy committed
328

329 330
/* True if handling a fatal error already.  */
bool fatal_error_in_progress;
331

332 333 334
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
335 336
#endif

337 338 339 340 341 342 343
#if !HAVE_SETLOCALE
static char *
setlocale (int cat, char const *locale)
{
  return 0;
}
#endif
344

345 346 347 348 349 350 351 352 353 354 355 356 357
/* 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
}

358

359 360 361
/* Report a fatal error due to signal SIG, output a backtrace of at
   most BACKTRACE_LIMIT lines, and exit.  */
_Noreturn void
362
terminate_due_to_signal (int sig, int backtrace_limit)
Jim Blandy's avatar
Jim Blandy committed
363 364
{
  signal (sig, SIG_DFL);
365

366
  if (attempt_orderly_shutdown_on_fatal_signal)
367
    {
368 369 370 371 372 373 374 375 376 377 378 379
      /* 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);
        }
380
    }
Jim Blandy's avatar
Jim Blandy committed
381

382
  /* Signal the same code; this time it will really be fatal.
383 384
     Since we're in a signal handler, the signal is blocked, so we
     have to unblock it if we want to really receive it.  */
385
#ifndef MSDOS
Paul Eggert's avatar
Paul Eggert committed
386 387 388
  {
    sigset_t unblocked;
    sigemptyset (&unblocked);
389
    sigaddset (&unblocked, sig);
Paul Eggert's avatar
Paul Eggert committed
390 391
    pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
  }
392
#endif
393

394
  emacs_raise (sig);
395 396 397

  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Jim Blandy's avatar
Jim Blandy committed
398 399
}

Pavel Janík's avatar
Pavel Janík committed
400
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
401

Andreas Schwab's avatar
Andreas Schwab committed
402
static void
403
init_cmdargs (int argc, char **argv, int skip_args, char *original_pwd)
Jim Blandy's avatar
Jim Blandy committed
404
{
405
  int i;
406
  Lisp_Object name, dir, handler;
407
  ptrdiff_t count = SPECPDL_INDEX ();
408
  Lisp_Object raw_name;
409
  AUTO_STRING (slash_colon, "/:");
Jim Blandy's avatar
Jim Blandy committed
410

411 412 413
  initial_argv = argv;
  initial_argc = argc;

414 415 416 417 418 419 420 421 422 423 424 425
#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
426
  raw_name = build_unibyte_string (argv[0]);
427
#endif
428 429 430

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
431 432
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
433
    raw_name = concat2 (slash_colon, raw_name);
434 435 436 437

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

438 439 440 441 442 443
  /* 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,
444
		       Vexec_suffixes, &found, make_number (X_OK), false);
445
      if (yes == 1)
446 447 448
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
449 450
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
451
	    found = concat2 (slash_colon, found);
452 453
	  Vinvocation_directory = Ffile_name_directory (found);
	}
454
    }
455

456 457
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
458 459
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
460
    {
461 462 463
      Lisp_Object odir =
	original_pwd ? build_unibyte_string (original_pwd) : Qnil;

464 465
      Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, odir);
    }
466

467 468 469 470 471
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
      dir = Vinvocation_directory;
472 473 474 475 476 477 478 479 480 481
#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
482 483 484
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
485
	  Lisp_Object tem, lib_src_exists;
486 487
	  Lisp_Object etc_exists, info_exists;

488 489 490 491 492
	  /* 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);
493

494
#ifdef MSDOS
495 496 497 498 499
	  /* 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);
500 501 502
#else
	  info_exists = Qnil;
#endif
503 504

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
505
	    {
506 507 508
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
509
		{
510 511 512
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
513 514 515 516
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
517 518
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
519

520 521 522

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
523 524
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
525 526 527
#else
	  info_exists = Qnil;
#endif
528 529

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
530
	    {
531 532 533
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
534
		{
535 536 537 538
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
539 540 541 542 543 544 545 546
		}
	    }

	  /* 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))
	    {
547
	      name = Fexpand_file_name (tem, dir);
548 549 550 551 552 553 554
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
555 556 557 558 559
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
560 561 562
	/* 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
563
	Vcommand_line_args
564
	  = Fcons (build_unibyte_string (argv[i]), Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
565
    }
566 567

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
568
}
569 570

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
571 572
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
573
  (void)
574 575 576 577
{
  return Fcopy_sequence (Vinvocation_name);
}

578
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
579 580
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
581
  (void)
582 583 584 585
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
586

Karl Heuer's avatar
Karl Heuer committed
587 588 589 590 591 592 593 594 595
/* 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.  */
596

597
static bool
598 599
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
600
{
601
  char *p = NULL;
602
  ptrdiff_t arglen;
603 604 605 606 607 608 609
  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
610 611 612 613 614 615 616 617 618 619 620 621 622
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
623
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
624
	    ? p - arg : strlen (arg));
625
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
    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
650 651 652 653 654 655 656
/* 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)
    {
657
      emacs_perror ("Write error to standard output");
Paul Eggert's avatar
Paul Eggert committed
658 659 660 661 662 663
      _exit (EXIT_FAILURE);
    }

   if (close_stream (stderr) != 0)
     _exit (EXIT_FAILURE);
}
664

665 666
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
667
main (int argc, char **argv)
668
{
669
  Lisp_Object dummy;
670
  char stack_bottom_variable;
671
  bool do_initial_setlocale;
672
  bool dumping;
673 674 675 676
  int skip_args = 0;
#ifdef HAVE_SETRLIMIT
  struct rlimit rlim;
#endif
677
  bool no_loadup = 0;
678
  char *junk = 0;
679
  char *dname_arg = 0;
680
#ifdef DAEMON_MUST_EXEC
681 682
  char dname_arg2[80];
#endif
683
  char *ch_to_dir = 0;
684

685 686 687
  /* If we use --chdir, this records the original directory.  */
  char *original_pwd = 0;

688 689
  stack_base = &dummy;

690 691 692 693
#ifndef CANNOT_DUMP
  might_dump = !initialized;
#endif

694
#ifdef GNU_LINUX
695 696
  if (!initialized)
    {
Paul Eggert's avatar
Paul Eggert committed
697 698
      char *heap_start = my_heap_start ();
      heap_bss_diff = heap_start - max (my_endbss, my_endbss_static);
699
    }
700
#endif
701

702 703 704 705 706
#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 ();
707 708 709 710 711 712
#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
713 714 715
  /* 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 ();
716 717
#endif

718 719 720 721 722
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

723 724
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
#ifdef DARWIN_OS
725 726 727 728
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

729
  init_standard_fds ();
Paul Eggert's avatar
Paul Eggert committed
730 731
  atexit (close_output_streams);

732 733 734 735
#ifdef HAVE_MODULES
  module_init ();
#endif

736
  sort_args (argc, argv);
737 738
  argc = 0;
  while (argv[argc]) argc++;
739

740
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
741
    {
742 743
      const char *version, *copyright;
      if (initialized)
744
	{
745 746 747 748 749
	  Lisp_Object tem, tem2;
	  tem = Fsymbol_value (intern_c_string ("emacs-version"));
	  tem2 = Fsymbol_value (intern_c_string ("emacs-copyright"));
	  if (!STRINGP (tem))
	    {
750
	      fprintf (stderr, "Invalid value of 'emacs-version'\n");
751 752 753 754
	      exit (1);
	    }
	  if (!STRINGP (tem2))
	    {
755
	      fprintf (stderr, "Invalid value of 'emacs-copyright'\n");
756 757 758 759
	      exit (1);
	    }
	  else
	    {
760 761
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
762
	    }
763
	}
764 765
      else
	{
766 767
	  version = emacs_version;
	  copyright = emacs_copyright;
768
	}
769
      printf ("%s %s\n", PACKAGE_NAME, version);
770
      printf ("%s\n", copyright);
771 772
      printf ("%s comes with ABSOLUTELY NO WARRANTY.\n", PACKAGE_NAME);
      printf ("You may redistribute copies of %s\n", PACKAGE_NAME);
773 774 775 776
      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);
777
    }
778 779

  if (argmatch (argv, argc, "-chdir", "--chdir", 4, &ch_to_dir, &skip_args))
780
    {
781 782 783 784 785 786 787 788
#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
789
      original_pwd = emacs_get_current_dir_name ();
790
      if (chdir (ch_to_dir) != 0)
791 792 793 794 795 796
        {
          fprintf (stderr, "%s: Can't chdir to %s: %s\n",
                   argv[0], ch_to_dir, strerror (errno));
          exit (1);
        }
    }
797

798 799
  dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
			     || strcmp (argv[argc - 1], "bootstrap") == 0);
800

801
#ifdef HAVE_PERSONALITY_LINUX32
802
  if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
803
    {
804
      /* Set this so we only do this once.  */
805
      xputenv ("EMACS_HEAP_EXEC=true");
806

807 808
      /* A flag to turn off address randomization which is introduced
         in linux kernel shipped with fedora core 4 */
809
#define ADD_NO_RANDOMIZE 0x0040000
810
      personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
811 812
#undef  ADD_NO_RANDOMIZE

813
      execvp (argv[0], argv);
814

815
      /* If the exec fails, try to dump anyway.  */
816
      emacs_perror (argv[0]);
817 818 819
    }
#endif /* HAVE_PERSONALITY_LINUX32 */

820 821 822 823 824 825 826
#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).  */
827 828 829 830 831
  if (1
#ifndef CANNOT_DUMP
      && (!noninteractive || initialized)
#endif
      && !getrlimit (RLIMIT_STACK, &rlim))
832
    {
833
      long newlim;
834 835 836 837 838 839 840 841
      /* 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;
842 843 844 845 846
#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
847
      newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize ();
848
#endif
849
      if (newlim > rlim.rlim_max)
850 851
	{
	  newlim = rlim.rlim_max;
852 853
	  /* Don't let regex.c overflow the stack we have.  */
	  re_max_failures = (newlim - 200000) / ratio;
854
	}
855 856 857
      if (rlim.rlim_cur < newlim)
	rlim.rlim_cur = newlim;

858 859
      setrlimit (RLIMIT_STACK, &rlim);
    }
860
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK and not CYGWIN */
861

Jim Blandy's avatar
Jim Blandy committed
862 863 864 865
  /* Record (approximately) where the stack begins.  */
  stack_bottom = &stack_bottom_variable;

  clearerr (stdin);
866

867 868
  emacs_backtrace (-1);

869
#if !defined SYSTEM_MALLOC && !defined HYBRID_MALLOC
870 871
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
872

873
  /* Call malloc at least once, to run malloc_initialize_hook.
874 875
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
876

877
#endif	/* not SYSTEM_MALLOC and not HYBRID_MALLOC */
Jim Blandy's avatar
Jim Blandy committed
878

879
#ifdef MSDOS
880 881 882
  SET_BINARY (fileno (stdin));
  fflush (stdout);
  SET_BINARY (fileno (stdout));
883 884
#endif /* MSDOS */

885 886 887 888 889 890 891 892 893 894 895 896 897
  /* 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, "");
898
  text_quoting_flag = using_utf8 ();
899

Jim Blandy's avatar
Jim Blandy committed
900 901
  inhibit_window_system = 0;

Pavel Janík's avatar
Pavel Janík committed
902
  /* Handle the -t switch, which specifies filename to use as terminal.  */
903 904 905 906 907
  while (1)
    {
      char *term;
      if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
	{
908 909 910 911 912 913
	  emacs_close (STDIN_FILENO);
	  emacs_close (STDOUT_FILENO);
	  int result = emacs_open (term, O_RDWR, 0);
	  if (result != STDIN_FILENO
	      || (fcntl (STDIN_FILENO, F_DUPFD_CLOEXEC, STDOUT_FILENO)
		  != STDOUT_FILENO))
914 915
	    {
	      char *errstring = strerror (errno);
916
	      fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
917
	      exit (EXIT_FAILURE);
918
	    }
919
	  if (! isatty (STDIN_FILENO))
920
	    {
921
	      fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
922
	      exit (EXIT_FAILURE);
923 924
	    }
	  fprintf (stderr, "Using %s\n", term);
925
#ifdef HAVE_WINDOW_SYSTEM
926
	  inhibit_window_system = true; /* -t => -nw */
Jim Blandy's avatar
Jim Blandy committed
927
#endif
928 929 930 931 932
	}
      else
	break;
    }

933
  /* Command line option --no-windows is deprecated and thus not mentioned
Paul Eggert's avatar
Paul Eggert committed
934
     in the manual and usage information.  */
935 936
  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
937
    inhibit_window_system = 1;
Jim Blandy's avatar
Jim Blandy committed
938

Karl Heuer's avatar
Karl Heuer committed
939
  /* Handle the -batch switch, which means don't do interactive display.  */
Jim Blandy's avatar
Jim Blandy committed
940
  noninteractive = 0;
941
  if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
942 943 944 945
    {
      noninteractive = 1;
      Vundo_outer_limit = Qnil;
    }
946 947 948
  if (argmatch (argv, argc, "-script", "--script", 3, &junk, &skip_args))
    {
      noninteractive = 1;	/* Set batch mode.  */
949
      /* Convert --script to -scriptload, un-skip it, and sort again
950
	 so that it will be handled in proper sequence.  */
951
      /* FIXME broken for --script=FILE - is that supposed to work?  */
952
      argv[skip_args - 1] = (char *) "-scriptload";
953 954 955
      skip_args -= 2;
      sort_args (argc, argv);
    }
Karl Heuer's avatar
Karl Heuer committed
956

Pavel Janík's avatar
Pavel Janík committed
957
  /* Handle the --help option, which gives a usage message.  */
958
  if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
Jim Blandy's avatar
Jim Blandy committed
959
    {
Paul Eggert's avatar
Paul Eggert committed
960 961
      int i;
      printf ("Usage: %s [OPTION-OR-FILENAME]...\n", argv[0]);
962
      for (i = 0; i < ARRAYELTS (usage_message); i++)
Paul Eggert's avatar
Paul Eggert committed
963
	fputs (usage_message[i], stdout);
Karl Heuer's avatar
Karl Heuer committed
964
      exit (0);
Jim Blandy's avatar
Jim Blandy committed
965 966
    }

967
#ifndef WINDOWSNT
Paul Eggert's avatar
Paul Eggert committed
968 969
  /* Make sure IS_DAEMON starts up as false.  */
  daemon_pipe[1] = 0;
970 971 972
#else
  w32_daemon_event = NULL;
#endif
Paul Eggert's avatar
Paul Eggert committed
973

974 975
  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
976
    {
977
#ifndef DOS_NT
978 979 980 981 982
      pid_t f;

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

983 984 985 986 987 988 989 990 991 992 993 994 995 996
	 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.

997 998 999 1000
	 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.  */
1001
      if (emacs_pipe (daemon_pipe) != 0)
1002 1003 1004 1005 1006
	{
	  fprintf (stderr, "Cannot pipe!\n");
	  exit (1);
	}

1007
#ifdef HAVE_LIBSYSTEMD
1008 1009
      /* Read the number of sockets passed through by systemd.  */
      int systemd_socket = sd_listen_fds (1);
1010 1011

      if (systemd_socket > 1)
1012 1013 1014 1015 1016 1017 1018
        fprintf (stderr,
		 ("\n"
		  "Warning: systemd passed more than one socket to Emacs.\n"
		  "Try 'Accept=false' in the Emacs socket unit file.\n"));
      else if (systemd_socket == 1
	       && (0 < sd_is_socket (SD_LISTEN_FDS_START,
				     AF_UNSPEC, SOCK_STREAM, 1)))
1019 1020 1021
        set_external_socket_descriptor (SD_LISTEN_FDS_START);
#endif /* HAVE_LIBSYSTEMD */

1022
#ifndef DAEMON_MUST_EXEC
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");
1027
#endif /* USE_GTK */
1028
      f = fork ();
1029
#else /* DAEMON_MUST_EXEC */
1030 1031 1032 1033
      if (!dname_arg || !strchr (dname_arg, '\n'))
	  f = fork ();  /* in orig */
      else
	  f = 0;  /* in exec'd */
1034
#endif /* !DAEMON_MUST_EXEC */
1035
      if (f > 0)
1036 1037 1038 1039 1040
	{
	  int retval;
	  char buf[1];

	  /* Close unused writing end of the pipe.  */
1041
	  emacs_close (daemon_pipe[1]);
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054

	  /* 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);
	    }
1055 1056 1057 1058 1059
	  else if (retval == 0)
	    {
	      fprintf (stderr, "Error: server did not start correctly\n");
	      exit (1);
	    }
1060

1061
	  emacs_close (daemon_pipe[0]);
1062 1063
	  exit (0);
	}
1064 1065
      if (f < 0)
	{
1066 1067
	  emacs_perror ("fork");
	  exit (EXIT_CANCELED);
1068 1069
	}

1070
#ifdef DAEMON_MUST_EXEC