emacs.c 80.2 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, 2001-2018 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 <https://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>
Paul Eggert's avatar
Paul Eggert committed
26
#include <stdlib.h>
Jim Blandy's avatar
Jim Blandy committed
27 28

#include <sys/file.h>
29 30
#include <unistd.h>

Paul Eggert's avatar
Paul Eggert committed
31
#include <close-stream.h>
32

33
#define MAIN_PROGRAM
34
#include "lisp.h"
35
#include "sysstdio.h"
36

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
#ifdef MSDOS
#include <binary-io.h>
Eli Zaretskii's avatar
Eli Zaretskii committed
57
#include "dosfns.h"
58 59
#endif

60
#ifdef HAVE_LIBSYSTEMD
61 62 63
# include <systemd/sd-daemon.h>
# include <sys/socket.h>
#endif
64

65 66 67 68
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

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"
86
#include "ptr-bounds.h"
Paul Eggert's avatar
Paul Eggert committed
87
#include "regex.h"
88
#include "sheap.h"
Paul Eggert's avatar
Paul Eggert committed
89
#include "syntax.h"
90
#include "sysselect.h"
Paul Eggert's avatar
Paul Eggert committed
91
#include "systime.h"
92
#include "puresize.h"
Jim Blandy's avatar
Jim Blandy committed
93

Paul Eggert's avatar
Paul Eggert committed
94
#include "getpagesize.h"
Ted Zlatanov's avatar
Ted Zlatanov committed
95 96
#include "gnutls.h"

97
#ifdef PROFILING
98 99
# include <sys/gmon.h>
extern void moncontrol (int mode);
100 101 102 103 104
# ifdef __MINGW32__
extern unsigned char etext asm ("etext");
# else
extern char etext;
# endif
105 106
#endif

107 108 109 110
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif

111 112 113 114
#if HAVE_WCHAR_H
# include <wchar.h>
#endif

115 116 117 118 119
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif

Glenn Morris's avatar
Glenn Morris committed
120
static const char emacs_version[] = PACKAGE_VERSION;
121
static const char emacs_copyright[] = COPYRIGHT;
Glenn Morris's avatar
Glenn Morris committed
122
static const char emacs_bugreport[] = PACKAGE_BUGREPORT;
123

124 125
/* Empty lisp strings.  To avoid having to build any others.  */
Lisp_Object empty_unibyte_string, empty_multibyte_string;
Stefan Monnier's avatar
Stefan Monnier committed
126

127 128 129 130 131
#ifdef WINDOWSNT
/* Cache for externally loaded libraries.  */
Lisp_Object Vlibrary_cache;
#endif

132 133 134 135
/* 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
136

Paul Eggert's avatar
Paul Eggert committed
137
#ifndef CANNOT_DUMP
138
/* Set to true if this instance of Emacs might dump.  */
139
# ifndef DOUG_LEA_MALLOC
140
static
141
# endif
142
bool might_dump;
143
#endif
144

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
#endif

158
#if defined GNU_LINUX && !defined CANNOT_DUMP
159
/* The gap between BSS end and heap start as far as we can tell.  */
160 161
static uprintmax_t heap_bss_diff;
#endif
162

163 164
/* To run as a background daemon under Cocoa or Windows,
   we must do a fork+exec, not a simple fork.
165 166 167 168 169 170 171 172 173 174

   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. */
175
#if defined NS_IMPL_COCOA || (defined HAVE_NTGUI && defined CYGWIN)
176 177 178
# define DAEMON_MUST_EXEC
#endif

179 180
/* True means running Emacs without interactive terminal.  */
bool noninteractive;
Jim Blandy's avatar
Jim Blandy committed
181

182 183
/* True means remove site-lisp directories from load-path.  */
bool no_site_lisp;
184

Paul Eggert's avatar
Paul Eggert committed
185 186 187
/* True means put details like time stamps into builds.  */
bool build_details;

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

191 192 193
/* 0 not a daemon, 1 new-style (foreground), 2 old-style (background).  */
int daemon_type;

194
#ifndef WINDOWSNT
195 196
/* Pipe used to send exit notification to the background daemon parent at
   startup.  On Windows, we use a kernel event instead.  */
197
static int daemon_pipe[2];
198 199 200
#else
HANDLE w32_daemon_event;
#endif
201

202 203 204
/* Save argv and argc.  */
char **initial_argv;
int initial_argc;
205

206
static void sort_args (int argc, char **argv);
207
static void syms_of_emacs (void);
Gerd Moellmann's avatar
Gerd Moellmann committed
208

Paul Eggert's avatar
Paul Eggert committed
209
/* C99 needs each string to be at most 4095 characters, and the usage
Kenichi Handa's avatar
Kenichi Handa committed
210
   strings below are split to not overflow this limit.  */
Paul Eggert's avatar
Paul Eggert committed
211 212
static char const *const usage_message[] =
  { "\
Gerd Moellmann's avatar
Gerd Moellmann committed
213 214 215 216 217
\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\
218
Run M-x info RET m emacs RET m emacs invocation RET inside Emacs to\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
219 220 221 222
read the main documentation for these command-line arguments.\n\
\n\
Initialization options:\n\
\n\
Paul Eggert's avatar
Paul Eggert committed
223 224
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
225
--batch                     do not do interactive display; implies -q\n\
226
--chdir DIR                 change to directory DIR\n\
227 228
--daemon, --bg-daemon[=NAME] start a (named) server in the background\n\
--fg-daemon[=NAME]          start a (named) server in the foreground\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\
231 232 233
",
#ifdef HAVE_MODULES
    "\
234
--module-assertions         assert behavior of dynamic modules\n\
Paul Eggert's avatar
Paul Eggert committed
235
",
236
#endif
Paul Eggert's avatar
Paul Eggert committed
237
    "\
Paul Eggert's avatar
Paul Eggert committed
238
--no-build-details          do not add build details such as time stamps\n\
Kenichi Handa's avatar
Kenichi Handa committed
239 240
--no-desktop                do not load a saved desktop\n\
--no-init-file, -q          load neither ~/.emacs nor default.el\n\
241
--no-loadup, -nl            do not load loadup.el into bare Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
242
--no-site-file              do not load site-start.el\n\
243
--no-x-resources            do not load X resources\n\
244
--no-site-lisp, -nsl        do not add site-lisp directories to load-path\n\
Kenichi Handa's avatar
Kenichi Handa committed
245
--no-splash                 do not display a splash screen on startup\n\
246
--no-window-system, -nw     do not communicate with X, ignoring $DISPLAY\n\
Paul Eggert's avatar
Paul Eggert committed
247 248
",
    "\
249 250
--quick, -Q                 equivalent to:\n\
                              -q --no-site-file --no-site-lisp --no-splash\n\
251
                              --no-x-resources\n\
Kenichi Handa's avatar
Kenichi Handa committed
252 253 254
--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
255 256 257
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
258 259
Action options:\n\
\n\
260
FILE                    visit FILE\n\
261 262
+LINE                   go to line LINE in next FILE\n\
+LINE:COLUMN            go to line LINE, column COLUMN, in next FILE\n\
263
--directory, -L DIR     prepend DIR to load-path (with :DIR, append DIR)\n\
Kenichi Handa's avatar
Kenichi Handa committed
264 265
--eval EXPR             evaluate Emacs Lisp expression EXPR\n\
--execute EXPR          evaluate Emacs Lisp expression EXPR\n\
Paul Eggert's avatar
Paul Eggert committed
266 267
",
    "\
268 269
--file FILE             visit FILE\n\
--find-file FILE        visit FILE\n\
Kenichi Handa's avatar
Kenichi Handa committed
270 271 272 273
--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\
274
--visit FILE            visit FILE\n\
Paul Eggert's avatar
Paul Eggert committed
275 276 277
\n\
",
    "\
278
Display options:\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
279
\n\
Kenichi Handa's avatar
Kenichi Handa committed
280
--background-color, -bg COLOR   window background color\n\
281 282
--basic-display, -D             disable many display features;\n\
                                  used for debugging Emacs\n\
Kenichi Handa's avatar
Kenichi Handa committed
283 284
--border-color, -bd COLOR       main border color\n\
--border-width, -bw WIDTH       width of main border\n\
Paul Eggert's avatar
Paul Eggert committed
285 286
",
    "\
287
--color, --color=MODE           override color mode for character terminals;\n\
288 289
                                  MODE defaults to `auto', and\n\
                                  can also be `never', `always',\n\
Kenichi Handa's avatar
Kenichi Handa committed
290 291 292 293
                                  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
294 295
",
    "\
Kenichi Handa's avatar
Kenichi Handa committed
296
--fullheight, -fh               make the first frame high as the screen\n\
297
--fullscreen, -fs               make the first frame fullscreen\n\
Kenichi Handa's avatar
Kenichi Handa committed
298
--fullwidth, -fw                make the first frame wide as the screen\n\
299
--maximized, -mm                make the first frame maximized\n\
Kenichi Handa's avatar
Kenichi Handa committed
300
--geometry, -g GEOMETRY         window geometry\n\
Paul Eggert's avatar
Paul Eggert committed
301 302
",
    "\
Jan Djärv's avatar
Jan Djärv committed
303
--no-bitmap-icon, -nbi          do not use picture of gnu for Emacs icon\n\
Kenichi Handa's avatar
Kenichi Handa committed
304 305 306 307 308
--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
309 310
",
    "\
311
--no-blinking-cursor, -nbc      disable blinking cursor\n\
Kenichi Handa's avatar
Kenichi Handa committed
312 313 314 315
--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
316
--parent-id XID                 set parent window\n\
Kenichi Handa's avatar
Kenichi Handa committed
317 318
--help                          display this help and exit\n\
--version                       output version information and exit\n\
Paul Eggert's avatar
Paul Eggert committed
319 320 321
\n\
",
    "\
Gerd Moellmann's avatar
Gerd Moellmann committed
322 323 324 325 326
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\
327
the operation of Emacs.  See the main documentation.\n\
328
\n\
Glenn Morris's avatar
Glenn Morris committed
329
Report bugs to " PACKAGE_BUGREPORT ".  First, please see the Bugs\n\
Gerd Moellmann's avatar
Gerd Moellmann committed
330
section of the Emacs manual or the file BUGS.\n"
Paul Eggert's avatar
Paul Eggert committed
331
  };
Gerd Moellmann's avatar
Gerd Moellmann committed
332

Jim Blandy's avatar
Jim Blandy committed
333

334 335
/* True if handling a fatal error already.  */
bool fatal_error_in_progress;
336

337 338 339
#ifdef HAVE_NS
/* NS autrelease pool, for memory management.  */
static void *ns_pool;
340 341
#endif

342 343 344 345 346 347 348
#if !HAVE_SETLOCALE
static char *
setlocale (int cat, char const *locale)
{
  return 0;
}
#endif
349

350 351 352 353 354 355 356 357 358 359 360 361 362
/* 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
}

363

364 365 366
/* Report a fatal error due to signal SIG, output a backtrace of at
   most BACKTRACE_LIMIT lines, and exit.  */
_Noreturn void
367
terminate_due_to_signal (int sig, int backtrace_limit)
Jim Blandy's avatar
Jim Blandy committed
368 369
{
  signal (sig, SIG_DFL);
370

371
  if (attempt_orderly_shutdown_on_fatal_signal)
372
    {
373 374 375 376 377 378 379 380 381 382 383 384
      /* 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);
        }
385
    }
Jim Blandy's avatar
Jim Blandy committed
386

387
  /* Signal the same code; this time it will really be fatal.
388 389
     Since we're in a signal handler, the signal is blocked, so we
     have to unblock it if we want to really receive it.  */
390
#ifndef MSDOS
Paul Eggert's avatar
Paul Eggert committed
391 392 393
  {
    sigset_t unblocked;
    sigemptyset (&unblocked);
394
    sigaddset (&unblocked, sig);
Paul Eggert's avatar
Paul Eggert committed
395 396
    pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
  }
397
#endif
398

399
  emacs_raise (sig);
400 401 402

  /* This shouldn't be executed, but it prevents a warning.  */
  exit (1);
Jim Blandy's avatar
Jim Blandy committed
403 404
}

Pavel Janík's avatar
Pavel Janík committed
405
/* Code for dealing with Lisp access to the Unix command line.  */
Jim Blandy's avatar
Jim Blandy committed
406

Andreas Schwab's avatar
Andreas Schwab committed
407
static void
408
init_cmdargs (int argc, char **argv, int skip_args, char *original_pwd)
Jim Blandy's avatar
Jim Blandy committed
409
{
410
  int i;
411
  Lisp_Object name, dir, handler;
412
  ptrdiff_t count = SPECPDL_INDEX ();
413
  Lisp_Object raw_name;
414
  AUTO_STRING (slash_colon, "/:");
Jim Blandy's avatar
Jim Blandy committed
415

416 417 418
  initial_argv = argv;
  initial_argc = argc;

419 420 421 422 423 424 425 426 427 428 429 430
#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
431
  raw_name = build_unibyte_string (argv[0]);
432
#endif
433 434 435

  /* Add /: to the front of the name
     if it would otherwise be treated as magic.  */
436 437
  handler = Ffind_file_name_handler (raw_name, Qt);
  if (! NILP (handler))
438
    raw_name = concat2 (slash_colon, raw_name);
439 440 441 442

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

443 444 445 446 447 448
  /* 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,
449
		       Vexec_suffixes, &found, make_number (X_OK), false);
450
      if (yes == 1)
451 452 453
	{
	  /* Add /: to the front of the name
	     if it would otherwise be treated as magic.  */
454 455
	  handler = Ffind_file_name_handler (found, Qt);
	  if (! NILP (handler))
456
	    found = concat2 (slash_colon, found);
457 458
	  Vinvocation_directory = Ffile_name_directory (found);
	}
459
    }
460

461 462
  if (!NILP (Vinvocation_directory)
      && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
463 464
    /* Emacs was started with relative path, like ./emacs.
       Make it absolute.  */
465
    {
466 467 468
      Lisp_Object odir =
	original_pwd ? build_unibyte_string (original_pwd) : Qnil;

469 470
      Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, odir);
    }
471

472 473 474 475
  Vinstallation_directory = Qnil;

  if (!NILP (Vinvocation_directory))
    {
476 477 478
      if (NILP (Vpurify_flag) && !NILP (Ffboundp (Qfile_truename)))
        Vinvocation_directory = call1 (Qfile_truename, Vinvocation_directory);

479
      dir = Vinvocation_directory;
480 481 482 483 484 485 486 487 488 489
#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
490 491 492
      name = Fexpand_file_name (Vinvocation_name, dir);
      while (1)
	{
493
	  Lisp_Object tem, lib_src_exists;
494 495
	  Lisp_Object etc_exists, info_exists;

496 497 498 499 500
	  /* 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);
501

502
#ifdef MSDOS
503 504 505 506 507
	  /* 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);
508 509 510
#else
	  info_exists = Qnil;
#endif
511 512

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
513
	    {
514 515 516
	      tem = Fexpand_file_name (build_string ("etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
517
		{
518 519 520
		  Vinstallation_directory
		    = Ffile_name_as_directory (dir);
		  break;
521 522 523 524
		}
	    }

	  /* See if dir's parent contains those subdirs.  */
525 526
	  tem = Fexpand_file_name (build_string ("../lib-src"), dir);
	  lib_src_exists = Ffile_exists_p (tem);
527

528 529 530

#ifdef MSDOS
	  /* See the MSDOS commentary above.  */
531 532
	  tem = Fexpand_file_name (build_string ("../info"), dir);
	  info_exists = Ffile_exists_p (tem);
533 534 535
#else
	  info_exists = Qnil;
#endif
536 537

	  if (!NILP (lib_src_exists) || !NILP (info_exists))
538
	    {
539 540 541
	      tem = Fexpand_file_name (build_string ("../etc"), dir);
	      etc_exists = Ffile_exists_p (tem);
	      if (!NILP (etc_exists))
542
		{
543 544 545 546
		  tem = Fexpand_file_name (build_string (".."), dir);
		  Vinstallation_directory
		    = Ffile_name_as_directory (tem);
		  break;
547 548 549 550 551 552 553 554
		}
	    }

	  /* 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))
	    {
555
	      name = Fexpand_file_name (tem, dir);
556 557 558 559 560 561 562
	      dir = Ffile_name_directory (name);
	    }
	  else
	    break;
	}
    }

Jim Blandy's avatar
Jim Blandy committed
563 564 565 566 567
  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
568 569 570
	/* 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
571
	Vcommand_line_args
572
	  = Fcons (build_unibyte_string (argv[i]), Vcommand_line_args);
Jim Blandy's avatar
Jim Blandy committed
573
    }
574 575

  unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
576
}
577 578

DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
Pavel Janík's avatar
Pavel Janík committed
579 580
       doc: /* Return the program name that was used to run Emacs.
Any directory names are omitted.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
581
  (void)
582 583 584 585
{
  return Fcopy_sequence (Vinvocation_name);
}

586
DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
Pavel Janík's avatar
Pavel Janík committed
587 588
       0, 0, 0,
       doc: /* Return the directory name in which the Emacs executable was located.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
589
  (void)
590 591 592 593
{
  return Fcopy_sequence (Vinvocation_directory);
}

Jim Blandy's avatar
Jim Blandy committed
594

Karl Heuer's avatar
Karl Heuer committed
595 596 597 598 599 600 601 602 603
/* 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.  */
604

605
static bool
606 607
argmatch (char **argv, int argc, const char *sstr, const char *lstr,
          int minlen, char **valptr, int *skipptr)
Karl Heuer's avatar
Karl Heuer committed
608
{
609
  char *p = NULL;
610
  ptrdiff_t arglen;
611 612 613 614 615 616 617
  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
618 619 620 621 622 623 624 625 626 627 628 629 630
  if (arg == NULL)
    return 0;
  if (strcmp (arg, sstr) == 0)
    {
      if (valptr != NULL)
	{
	  *valptr = argv[*skipptr+2];
	  *skipptr += 2;
	}
      else
	*skipptr += 1;
      return 1;
    }
631
  arglen = (valptr != NULL && (p = strchr (arg, '=')) != NULL
Karl Heuer's avatar
Karl Heuer committed
632
	    ? p - arg : strlen (arg));
633
  if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
Karl Heuer's avatar
Karl Heuer committed
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
    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
658 659 660 661 662 663 664
/* 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)
    {
665
      emacs_perror ("Write error to standard output");
Paul Eggert's avatar
Paul Eggert committed
666 667 668
      _exit (EXIT_FAILURE);
    }

669 670 671 672 673
  /* Do not close stderr if addresses are being sanitized, as the
     sanitizer might report to stderr after this function is
     invoked.  */
  if (!ADDRESS_SANITIZER && close_stream (stderr) != 0)
    _exit (EXIT_FAILURE);
Paul Eggert's avatar
Paul Eggert committed
674
}
675

676 677
/* ARGSUSED */
int
Dan Nicolaescu's avatar
Dan Nicolaescu committed
678
main (int argc, char **argv)
679
{
Paul Eggert's avatar
Paul Eggert committed
680 681 682 683
  /* Variable near the bottom of the stack, and aligned appropriately
     for pointers.  */
  void *stack_bottom_variable;

684
  bool do_initial_setlocale;
685
  bool dumping;
686
  int skip_args = 0;
687
  bool no_loadup = false;
Richard M. Stallman's avatar
Richard M. Stallman committed
688
  char *junk = 0;
689
  char *dname_arg = 0;
690
#ifdef DAEMON_MUST_EXEC
691 692
  char dname_arg2[80];
#endif
693
  char *ch_to_dir = 0;
694

695 696 697
  /* If we use --chdir, this records the original directory.  */
  char *original_pwd = 0;

698
  /* Record (approximately) where the stack begins.  */
Paul Eggert's avatar
Paul Eggert committed
699
  stack_bottom = (char *) &stack_bottom_variable;
700

701
#ifndef CANNOT_DUMP
702
  dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
703
			     || strcmp (argv[argc - 1], "bootstrap") == 0);
704 705 706
#else
  dumping = false;
#endif
707

Paul Eggert's avatar
Paul Eggert committed
708
  /* True if address randomization interferes with memory allocation.  */
709 710 711 712 713 714
# ifdef __PPC64__
  bool disable_aslr = true;
# else
  bool disable_aslr = dumping;
# endif

715 716
  if (disable_aslr && disable_address_randomization ()
      && !getenv ("EMACS_HEAP_EXEC"))
717 718
    {
      /* Set this so the personality will be reverted before execs
719 720
	 after this one, and to work around an re-exec loop on buggy
	 kernels (Bug#32083).  */
721 722 723 724 725 726 727 728 729 730
      xputenv ("EMACS_HEAP_EXEC=true");

      /* Address randomization was enabled, but is now disabled.
	 Re-execute Emacs to get a clean slate.  */
      execvp (argv[0], argv);

      /* If the exec fails, warn and then try anyway.  */
      perror (argv[0]);
    }

731 732 733
#ifndef CANNOT_DUMP
  might_dump = !initialized;

734
# ifdef GNU_LINUX
735 736
  if (!initialized)
    {
Paul Eggert's avatar
Paul Eggert committed
737 738
      char *heap_start = my_heap_start ();
      heap_bss_diff = heap_start - max (my_endbss, my_endbss_static);
739
    }
740
# endif
741
#endif
742

743 744 745 746 747
#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 ();
748 749 750 751 752
#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 ();
753 754 755
  /* Initialize the codepage for file names, needed to decode
     non-ASCII file names during startup.  */
  w32_init_file_name_codepage ();
756
#endif
757
  w32_init_main_thread ();
758 759
#endif

760 761 762 763 764
#ifdef RUN_TIME_REMAP
  if (initialized)
    run_time_remap (argv[0]);
#endif

765
/* If using unexmacosx.c (set by s/darwin.h), we must do this. */
766
#if defined DARWIN_OS && !defined CANNOT_DUMP
767 768 769 770
  if (!initialized)
    unexec_init_emacs_zone ();
#endif

771
  init_standard_fds ();
Paul Eggert's avatar
Paul Eggert committed
772 773
  atexit (close_output_streams);

774
  sort_args (argc, argv);
775 776
  argc = 0;
  while (argv[argc]) argc++;
777

778
  if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args))
779
    {
780 781
      const char *version, *copyright;
      if (initialized)
782
	{
783 784 785 786 787
	  Lisp_Object tem, tem2;
	  tem = Fsymbol_value (intern_c_string ("emacs-version"));
	  tem2 = Fsymbol_value (intern_c_string ("emacs-copyright"));
	  if (!STRINGP (tem))
	    {
788
	      fprintf (stderr, "Invalid value of 'emacs-version'\n");
789 790 791 792
	      exit (1);
	    }
	  if (!STRINGP (tem2))
	    {
793
	      fprintf (stderr, "Invalid value of 'emacs-copyright'\n");
794 795 796 797
	      exit (1);
	    }
	  else
	    {
798 799
	      version = SSDATA (tem);
	      copyright = SSDATA (tem2);
800
	    }
801
	}
802 803
      else
	{
804 805
	  version = emacs_version;
	  copyright = emacs_copyright;
806
	}
807
      printf ("%s %s\n", PACKAGE_NAME, version);
808
      printf ("%s\n", copyright);
809 810
      printf ("%s comes with ABSOLUTELY NO WARRANTY.\n", PACKAGE_NAME);
      printf ("You may redistribute copies of %s\n", PACKAGE_NAME);
811 812 813 814
      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);
815
    }
816 817

  if (argmatch (argv, argc, "-chdir", "--chdir", 4, &ch_to_dir, &skip_args))
818
    {
819 820 821 822 823 824 825 826
#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
827
      original_pwd = emacs_get_current_dir_name ();
828
      if (chdir (ch_to_dir) != 0)
829 830 831 832 833 834
        {
          fprintf (stderr, "%s: Can't chdir to %s: %s\n",
                   argv[0], ch_to_dir, strerror (errno));
          exit (1);
        }
    }
835

836 837 838 839 840 841 842
#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).  */
Paul Eggert's avatar
Paul Eggert committed
843 844
  struct rlimit rlim;
  if (getrlimit (RLIMIT_STACK, &rlim) == 0
845
      && 0 <= rlim.rlim_cur && rlim.rlim_cur <= LONG_MAX)
846
    {
847
      rlim_t lim = rlim.rlim_cur;
Paul Eggert's avatar
Paul Eggert committed
848 849

      /* Approximate the amount regex.c needs per unit of
850
	 emacs_re_max_failures, then add 33% to cover the size of the
Paul Eggert's avatar
Paul Eggert committed
851 852
	 smaller stacks that regex.c successively allocates and
	 discards on its way to the maximum.  */
853 854
      int min_ratio = 20 * sizeof (char *);
      int ratio = min_ratio + min_ratio / 3;
Paul Eggert's avatar
Paul Eggert committed
855

856 857 858 859
      /* Extra space to cover what we're likely to use for other
         reasons.  For example, a typical GC might take 30K stack
         frames.  */
      int extra = (30 * 1000) * 50;
Paul Eggert's avatar
Paul Eggert committed
860 861 862 863 864 865 866

      bool try_to_grow_stack = true;
#ifndef CANNOT_DUMP
      try_to_grow_stack = !noninteractive || initialized;
#endif

      if (try_to_grow_stack)
867
	{
868
	  rlim_t newlim = emacs_re_max_failures * ratio + extra;
Paul Eggert's avatar
Paul Eggert committed
869 870 871 872

	  /* Round the new limit to a page boundary; this is needed
	     for Darwin kernel 15.4.0 (see Bug#23622) and perhaps
	     other systems.  Do not shrink the stack and do not exceed
873 874 875 876
	     rlim_max.  Don't worry about exact values of
	     RLIM_INFINITY etc. since in practice when they are
	     nonnegative they are so large that the code does the
	     right thing anyway.  */
Paul Eggert's avatar
Paul Eggert committed
877
	  long pagesize = getpagesize ();
878
	  newlim += pagesize - 1;
879
	  if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
880
	    newlim = rlim.rlim_max;
Paul Eggert's avatar
Paul Eggert committed
881 882 883 884 885 886 887 888
	  newlim -= newlim % pagesize;

	  if (pagesize <= newlim - lim)
	    {
	      rlim.rlim_cur = newlim;
	      if (setrlimit (RLIMIT_STACK, &rlim) == 0)
		lim = newlim;
	    }
889
	}
890 891 892 893 894
      /* If the stack is big enough, let regex.c more of it before
         falling back to heap allocation.  */
      emacs_re_safe_alloca = max
        (min (lim - extra, SIZE_MAX) * (min_ratio / ratio),
         MAX_ALLOCA);
895
    }
896
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK and not CYGWIN */
897

898
  clearerr_unlocked (stdin);
899

900 901
  emacs_backtrace (-1);

902
#if !defined SYSTEM_MALLOC && !defined HYBRID_MALLOC
903 904
  /* Arrange to get warning messages as memory fills up.  */
  memory_warnings (0, malloc_warning);
905

906
  /* Call malloc at least once, to run malloc_initialize_hook.
907 908
     Also call realloc and free for consistency.  */
  free (realloc (malloc (4), 4));
909

910
#endif	/* not SYSTEM_MALLOC and not HYBRID_MALLOC */
Jim Blandy's avatar
Jim Blandy committed
911

912
#ifdef MSDOS
Paul Eggert's avatar
Paul Eggert committed
913
  set_binary_mode (STDIN_FILENO, O_BINARY);
914
  fflush (stdout);
Paul Eggert's avatar
Paul Eggert committed
915
  set_binary_mode (STDOUT_FILENO, O_BINARY);
916 917
#endif /* MSDOS */

918 919 920 921 922 923 924 925 926 927 928 929 930
  /* 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, "");