src/emacs.c

   1 /* Fully extensible Emacs, running on Unix, intended for GNU.
   2    Copyright (C) 1985,86,87,93,94,95,97,1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include <signal.h>
  23 #include <errno.h>
  24
  25 #include <config.h>
  26 #include <stdio.h>
  27
  28 #include <sys/types.h>
  29 #include <sys/file.h>
  30
  31 #ifdef VMS
  32 #include <ssdef.h>
  33 #endif
  34
  35 #ifdef BSD_SYSTEM
  36 #include <sys/ioctl.h>
  37 #endif
  38
  39 #include "lisp.h"
  40 #include "commands.h"
  41 #include "intervals.h"
  42 #include "buffer.h"
  43
  44 #include "systty.h"
  45 #include "blockinput.h"
  46 #include "syssignal.h"
  47 #include "process.h"
  48 #include "keyboard.h"
  49
  50 #ifdef HAVE_SETRLIMIT
  51 #include <sys/time.h>
  52 #include <sys/resource.h>
  53 #endif
  54
  55 #ifndef O_RDWR
  56 #define O_RDWR 2
  57 #endif
  58
  59 extern void malloc_warning ();
  60 extern void set_time_zone_rule ();
  61 extern char *index ();
  62 extern char *strerror ();
  63
  64 /* Command line args from shell, as list of strings */
  65 Lisp_Object Vcommand_line_args;
  66
  67 /* The name under which Emacs was invoked, with any leading directory
  68    names discarded.  */
  69 Lisp_Object Vinvocation_name;
  70
  71 /* The directory name from which Emacs was invoked.  */
  72 Lisp_Object Vinvocation_directory;
  73
  74 /* The directory name in which to find subdirs such as lisp and etc.
  75    nil means get them only from PATH_LOADSEARCH.  */
  76 Lisp_Object Vinstallation_directory;
  77
  78 /* Hook run by `kill-emacs' before it does really anything.  */
  79 Lisp_Object Vkill_emacs_hook;
  80
  81 #ifdef SIGUSR1
  82 /* Hooks for signal USR1 and USR2 handing */
  83 Lisp_Object Vsignal_USR1_hook;
  84 #ifdef SIGUSR2
  85 Lisp_Object Vsignal_USR2_hook;
  86 #endif
  87 #endif
  88
  89 /* Search path separator.  */
  90 Lisp_Object Vpath_separator;
  91
  92 /* Set nonzero after Emacs has started up the first time.
  93   Prevents reinitialization of the Lisp world and keymaps
  94   on subsequent starts.  */
  95 int initialized;
  96
  97 #ifdef DOUG_LEA_MALLOC
  98 /* Preserves a pointer to the memory allocated that copies that
  99    static data inside glibc's malloc.  */
 100 void *malloc_state_ptr;
 101 /* From glibc, a routine that returns a copy of the malloc internal state.  */
 102 extern void *malloc_get_state ();
 103 /* From glibc, a routine that overwrites the malloc internal state.  */
 104 extern void malloc_set_state ();
 105 #endif
 106
 107 /* Variable whose value is symbol giving operating system type.  */
 108 Lisp_Object Vsystem_type;
 109
 110 /* Variable whose value is string giving configuration built for.  */
 111 Lisp_Object Vsystem_configuration;
 112
 113 /* Variable whose value is string giving configuration options,
 114    for use when reporting bugs.  */
 115 Lisp_Object Vsystem_configuration_options;
 116
 117 Lisp_Object Qfile_name_handler_alist;
 118
 119 /* If non-zero, emacs should not attempt to use an window-specific code,
 120    but instead should use the virtual terminal under which it was started */
 121 int inhibit_window_system;
 122
 123 /* If nonzero, set Emacs to run at this priority.  This is also used
 124    in child_setup and sys_suspend to make sure subshells run at normal
 125    priority; Those functions have their own extern declaration.  */
 126 int emacs_priority;
 127
 128 /* If non-zero a filter or a sentinel is running.  Tested to save the match
 129    data on the first attempt to change it inside asynchronous code. */
 130 int running_asynch_code;
 131
 132 #ifdef BSD_PGRPS
 133 /* See sysdep.c.  */
 134 extern int inherited_pgroup;
 135 #endif
 136
 137 #ifdef HAVE_X_WINDOWS
 138 /* If non-zero, -d was specified, meaning we're using some window system. */
 139 int display_arg;
 140 #endif
 141
 142 /* An address near the bottom of the stack.
 143    Tells GC how to save a copy of the stack.  */
 144 char *stack_bottom;
 145
 146 #ifdef HAVE_WINDOW_SYSTEM
 147 extern Lisp_Object Vwindow_system;
 148 #endif /* HAVE_WINDOW_SYSTEM */
 149
 150 extern Lisp_Object Vauto_save_list_file_name;
 151
 152 #ifdef USG_SHARED_LIBRARIES
 153 /* If nonzero, this is the place to put the end of the writable segment
 154    at startup.  */
 155
 156 unsigned int bss_end = 0;
 157 #endif
 158
 159 /* Nonzero means running Emacs without interactive terminal.  */
 160
 161 int noninteractive;
 162
 163 /* Value of Lisp variable `noninteractive'.
 164    Normally same as C variable `noninteractive'
 165    but nothing terrible happens if user sets this one.  */
 166
 167 int noninteractive1;
 168
 169 /* Save argv and argc.  */
 170 char **initial_argv;
 171 int initial_argc;
 172
 173 static void sort_args ();
 174 void syms_of_emacs ();
 175 \f
 176 /* Signal code for the fatal signal that was received */
 177 int fatal_error_code;
 178
 179 /* Nonzero if handling a fatal error already */
 180 int fatal_error_in_progress;
 181
 182 #ifdef SIGUSR1
 183 int SIGUSR1_in_progress=0;
 184 SIGTYPE
 185 handle_USR1_signal (sig)
 186      int sig;
 187 {
 188   if (! SIGUSR1_in_progress)
 189     {
 190       SIGUSR1_in_progress = 1;
 191
 192       if (!NILP (Vrun_hooks) && !noninteractive)
 193         call1 (Vrun_hooks, intern ("signal-USR1-hook"));
 194
 195       SIGUSR1_in_progress = 0;
 196     }
 197 }
 198
 199 #ifdef SIGUSR2
 200 int SIGUSR2_in_progress=0;
 201 SIGTYPE
 202 handle_USR2_signal (sig)
 203      int sig;
 204 {
 205   if (! SIGUSR2_in_progress)
 206     {
 207       SIGUSR2_in_progress = 1;
 208
 209       if (!NILP (Vrun_hooks) && !noninteractive)
 210         call1 (Vrun_hooks, intern ("signal-USR2-hook"));
 211
 212       SIGUSR2_in_progress = 0;
 213     }
 214 }
 215 #endif
 216 #endif
 217
 218 /* Handle bus errors, illegal instruction, etc. */
 219 SIGTYPE
 220 fatal_error_signal (sig)
 221      int sig;
 222 {
 223   fatal_error_code = sig;
 224   signal (sig, SIG_DFL);
 225
 226   TOTALLY_UNBLOCK_INPUT;
 227
 228   /* If fatal error occurs in code below, avoid infinite recursion.  */
 229   if (! fatal_error_in_progress)
 230     {
 231       fatal_error_in_progress = 1;
 232
 233       shut_down_emacs (sig, 0, Qnil);
 234     }
 235
 236 #ifdef VMS
 237   LIB$STOP (SS$_ABORT);
 238 #else
 239   /* Signal the same code; this time it will really be fatal.
 240      Remember that since we're in a signal handler, the signal we're
 241      going to send is probably blocked, so we have to unblock it if we
 242      want to really receive it.  */
 243 #ifndef MSDOS
 244   sigunblock (sigmask (fatal_error_code));
 245 #endif
 246   kill (getpid (), fatal_error_code);
 247 #endif /* not VMS */
 248 }
 249
 250 #ifdef SIGDANGER
 251
 252 /* Handler for SIGDANGER.  */
 253 SIGTYPE
 254 memory_warning_signal (sig)
 255      int sig;
 256 {
 257   signal (sig, memory_warning_signal);
 258
 259   malloc_warning ("Operating system warns that virtual memory is running low.\n");
 260
 261   /* It might be unsafe to call do_auto_save now.  */
 262   force_auto_save_soon ();
 263 }
 264 #endif
 265
 266 /* We define abort, rather than using it from the library,
 267    so that GDB can return from a breakpoint here.
 268    MSDOS has its own definition on msdos.c  */
 269
 270 #if ! defined (DOS_NT) && ! defined (NO_ABORT)
 271 void
 272 abort ()
 273 {
 274   kill (getpid (), SIGABRT);
 275   /* This shouldn't be executed, but it prevents a warning.  */
 276   exit (1);
 277 }
 278 #endif
 279
 280 \f
 281 /* Code for dealing with Lisp access to the Unix command line */
 282
 283 static void
 284 init_cmdargs (argc, argv, skip_args)
 285      int argc;
 286      char **argv;
 287      int skip_args;
 288 {
 289   register int i;
 290   Lisp_Object name, dir, tem;
 291   int count = specpdl_ptr - specpdl;
 292   Lisp_Object raw_name;
 293
 294   initial_argv = argv;
 295   initial_argc = argc;
 296
 297   raw_name = build_string (argv[0]);
 298
 299   /* Add /: to the front of the name
 300      if it would otherwise be treated as magic.  */
 301   tem = Ffind_file_name_handler (raw_name, Qt);
 302   if (! NILP (tem))
 303     raw_name = concat2 (build_string ("/:"), raw_name);
 304
 305   Vinvocation_name = Ffile_name_nondirectory (raw_name);
 306   Vinvocation_directory = Ffile_name_directory (raw_name);
 307
 308   /* If we got no directory in argv[0], search PATH to find where
 309      Emacs actually came from.  */
 310   if (NILP (Vinvocation_directory))
 311     {
 312       Lisp_Object found;
 313       int yes = openp (Vexec_path, Vinvocation_name,
 314                        EXEC_SUFFIXES, &found, 1);
 315       if (yes == 1)
 316         {
 317           /* Add /: to the front of the name
 318              if it would otherwise be treated as magic.  */
 319           tem = Ffind_file_name_handler (found, Qt);
 320           if (! NILP (tem))
 321             found = concat2 (build_string ("/:"), found);
 322           Vinvocation_directory = Ffile_name_directory (found);
 323         }
 324     }
 325
 326   if (!NILP (Vinvocation_directory)
 327       && NILP (Ffile_name_absolute_p (Vinvocation_directory)))
 328     /* Emacs was started with relative path, like ./emacs.
 329        Make it absolute.  */
 330     Vinvocation_directory = Fexpand_file_name (Vinvocation_directory, Qnil);
 331
 332   Vinstallation_directory = Qnil;
 333
 334   if (!NILP (Vinvocation_directory))
 335     {
 336       dir = Vinvocation_directory;
 337       name = Fexpand_file_name (Vinvocation_name, dir);
 338       while (1)
 339         {
 340           Lisp_Object tem, lib_src_exists;
 341           Lisp_Object etc_exists, info_exists;
 342
 343           /* See if dir contains subdirs for use by Emacs.
 344              Check for the ones that would exist in a build directory,
 345              not including lisp and info.  */
 346           tem = Fexpand_file_name (build_string ("lib-src"), dir);
 347           lib_src_exists = Ffile_exists_p (tem);
 348
 349 #ifdef MSDOS
 350           /* MSDOS installations frequently remove lib-src, but we still
 351              must set installation-directory, or else info won't find
 352              its files (it uses the value of installation-directory).  */
 353           tem = Fexpand_file_name (build_string ("info"), dir);
 354           info_exists = Ffile_exists_p (tem);
 355 #else
 356           info_exists = Qnil;
 357 #endif
 358
 359           if (!NILP (lib_src_exists) || !NILP (info_exists))
 360             {
 361               tem = Fexpand_file_name (build_string ("etc"), dir);
 362               etc_exists = Ffile_exists_p (tem);
 363               if (!NILP (etc_exists))
 364                 {
 365                   Vinstallation_directory
 366                     = Ffile_name_as_directory (dir);
 367                   break;
 368                 }
 369             }
 370
 371           /* See if dir's parent contains those subdirs.  */
 372           tem = Fexpand_file_name (build_string ("../lib-src"), dir);
 373           lib_src_exists = Ffile_exists_p (tem);
 374
 375
 376 #ifdef MSDOS
 377           /* See the MSDOS commentary above.  */
 378           tem = Fexpand_file_name (build_string ("../info"), dir);
 379           info_exists = Ffile_exists_p (tem);
 380 #else
 381           info_exists = Qnil;
 382 #endif
 383
 384           if (!NILP (lib_src_exists) || !NILP (info_exists))
 385             {
 386               tem = Fexpand_file_name (build_string ("../etc"), dir);
 387               etc_exists = Ffile_exists_p (tem);
 388               if (!NILP (etc_exists))
 389                 {
 390                   tem = Fexpand_file_name (build_string (".."), dir);
 391                   Vinstallation_directory
 392                     = Ffile_name_as_directory (tem);
 393                   break;
 394                 }
 395             }
 396
 397           /* If the Emacs executable is actually a link,
 398              next try the dir that the link points into.  */
 399           tem = Ffile_symlink_p (name);
 400           if (!NILP (tem))
 401             {
 402               name = Fexpand_file_name (tem, dir);
 403               dir = Ffile_name_directory (name);
 404             }
 405           else
 406             break;
 407         }
 408     }
 409
 410   Vcommand_line_args = Qnil;
 411
 412   for (i = argc - 1; i >= 0; i--)
 413     {
 414       if (i == 0 || i > skip_args)
 415         Vcommand_line_args
 416           = Fcons (build_string (argv[i]), Vcommand_line_args);
 417     }
 418
 419   unbind_to (count, Qnil);
 420 }
 421
 422 DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
 423   "Return the program name that was used to run Emacs.\n\
 424 Any directory names are omitted.")
 425   ()
 426 {
 427   return Fcopy_sequence (Vinvocation_name);
 428 }
 429
 430 DEFUN ("invocation-directory", Finvocation_directory, Sinvocation_directory,
 431   0, 0, 0,
 432   "Return the directory name in which the Emacs executable was located")
 433   ()
 434 {
 435   return Fcopy_sequence (Vinvocation_directory);
 436 }
 437
 438 \f
 439 #ifdef VMS
 440 #ifdef LINK_CRTL_SHARE
 441 #ifdef SHARABLE_LIB_BUG
 442 extern noshare char **environ;
 443 #endif /* SHARABLE_LIB_BUG */
 444 #endif /* LINK_CRTL_SHARE */
 445 #endif /* VMS */
 446
 447 #ifdef HAVE_TZSET
 448 /* A valid but unlikely value for the TZ environment value.
 449    It is OK (though a bit slower) if the user actually chooses this value.  */
 450 static char dump_tz[] = "UtC0";
 451 #endif
 452
 453 #ifndef ORDINARY_LINK
 454 /* We don't include crtbegin.o and crtend.o in the link,
 455    so these functions and variables might be missed.
 456    Provide dummy definitions to avoid error.
 457    (We don't have any real constructors or destructors.)  */
 458 #ifdef __GNUC__
 459 #ifndef GCC_CTORS_IN_LIBC
 460 void __do_global_ctors ()
 461 {}
 462 void __do_global_ctors_aux ()
 463 {}
 464 void __do_global_dtors ()
 465 {}
 466 /* Linux has a bug in its library; avoid an error.  */
 467 #ifndef LINUX
 468 char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
 469 #endif
 470 char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
 471 #endif /* GCC_CTORS_IN_LIBC */
 472 void __main ()
 473 {}
 474 #endif /* __GNUC__ */
 475 #endif /* ORDINARY_LINK */
 476
 477 /* Test whether the next argument in ARGV matches SSTR or a prefix of
 478    LSTR (at least MINLEN characters).  If so, then if VALPTR is non-null
 479    (the argument is supposed to have a value) store in *VALPTR either
 480    the next argument or the portion of this one after the equal sign.
 481    ARGV is read starting at position *SKIPPTR; this index is advanced
 482    by the number of arguments used.
 483
 484    Too bad we can't just use getopt for all of this, but we don't have
 485    enough information to do it right.  */
 486
 487 static int
 488 argmatch (argv, argc, sstr, lstr, minlen, valptr, skipptr)
 489      char **argv;
 490      int argc;
 491      char *sstr;
 492      char *lstr;
 493      int minlen;
 494      char **valptr;
 495      int *skipptr;
 496 {
 497   char *p;
 498   int arglen;
 499   char *arg;
 500
 501   /* Don't access argv[argc]; give up in advance.  */
 502   if (argc <= *skipptr + 1)
 503     return 0;
 504
 505   arg = argv[*skipptr+1];
 506   if (arg == NULL)
 507     return 0;
 508   if (strcmp (arg, sstr) == 0)
 509     {
 510       if (valptr != NULL)
 511         {
 512           *valptr = argv[*skipptr+2];
 513           *skipptr += 2;
 514         }
 515       else
 516         *skipptr += 1;
 517       return 1;
 518     }
 519   arglen = (valptr != NULL && (p = index (arg, '=')) != NULL
 520             ? p - arg : strlen (arg));
 521   if (lstr == 0 || arglen < minlen || strncmp (arg, lstr, arglen) != 0)
 522     return 0;
 523   else if (valptr == NULL)
 524     {
 525       *skipptr += 1;
 526       return 1;
 527     }
 528   else if (p != NULL)
 529     {
 530       *valptr = p+1;
 531       *skipptr += 1;
 532       return 1;
 533     }
 534   else if (argv[*skipptr+2] != NULL)
 535     {
 536       *valptr = argv[*skipptr+2];
 537       *skipptr += 2;
 538       return 1;
 539     }
 540   else
 541     {
 542       return 0;
 543     }
 544 }
 545
 546 /* ARGSUSED */
 547 int
 548 main (argc, argv, envp)
 549      int argc;
 550      char **argv;
 551      char **envp;
 552 {
 553   char stack_bottom_variable;
 554   int skip_args = 0;
 555   extern int errno;
 556   extern int sys_nerr;
 557 #ifdef HAVE_SETRLIMIT
 558   struct rlimit rlim;
 559 #endif
 560   int no_loadup = 0;
 561
 562 #ifdef LINUX_SBRK_BUG
 563   __sbrk (1);
 564 #endif
 565
 566 #ifdef DOUG_LEA_MALLOC
 567   if (initialized)
 568     {
 569       extern void r_alloc_reinit ();
 570       malloc_set_state (malloc_state_ptr);
 571       free (malloc_state_ptr);
 572       r_alloc_reinit ();
 573     }
 574 #endif
 575
 576 #ifdef RUN_TIME_REMAP
 577   if (initialized)
 578     run_time_remap (argv[0]);
 579 #endif
 580
 581   sort_args (argc, argv);
 582   argc = 0;
 583   while (argv[argc]) argc++;
 584
 585   if (argmatch (argv, argc, "-version", "--version", 3, NULL, &skip_args)
 586       /* We don't know the version number unless this is a dumped Emacs.
 587          So ignore --version otherwise.  */
 588       && initialized)
 589     {
 590       Lisp_Object tem;
 591       tem = Fsymbol_value (intern ("emacs-version"));
 592       if (!STRINGP (tem))
 593         {
 594           fprintf (stderr, "Invalid value of `emacs-version'\n");
 595           exit (1);
 596         }
 597       else
 598         {
 599           printf ("GNU Emacs %s\n", XSTRING (tem)->data);
 600           printf ("Copyright (C) 1998 Free Software Foundation, Inc.\n");
 601           printf ("GNU Emacs comes with ABSOLUTELY NO WARRANTY.\n");
 602           printf ("You may redistribute copies of Emacs\n");
 603           printf ("under the terms of the GNU General Public License.\n");
 604           printf ("For more information about these matters, ");
 605           printf ("see the file named COPYING.\n");
 606           exit (0);
 607         }
 608     }
 609
 610 /* Map in shared memory, if we are using that.  */
 611 #ifdef HAVE_SHM
 612   if (argmatch (argv, argc, "-nl", "--no-shared-memory", 6, NULL, &skip_args))
 613     {
 614       map_in_data (0);
 615       /* The shared memory was just restored, which clobbered this.  */
 616       skip_args = 1;
 617     }
 618   else
 619     {
 620       map_in_data (1);
 621       /* The shared memory was just restored, which clobbered this.  */
 622       skip_args = 0;
 623     }
 624 #endif
 625
 626 #ifdef NeXT
 627   {
 628     extern int malloc_cookie;
 629     /* This helps out unexnext.c.  */
 630     if (initialized)
 631       if (malloc_jumpstart (malloc_cookie) != 0)
 632         printf ("malloc jumpstart failed!\n");
 633   }
 634 #endif /* NeXT */
 635
 636 #ifdef VMS
 637   /* If -map specified, map the data file in */
 638   {
 639     char *file;
 640     if (argmatch (argv, argc, "-map", "--map-data", 3, &mapin_file, &skip_args))
 641       mapin_data (file);
 642   }
 643
 644 #ifdef LINK_CRTL_SHARE
 645 #ifdef SHARABLE_LIB_BUG
 646   /* Bletcherous shared libraries! */
 647   if (!stdin)
 648     stdin = fdopen (0, "r");
 649   if (!stdout)
 650     stdout = fdopen (1, "w");
 651   if (!stderr)
 652     stderr = fdopen (2, "w");
 653   if (!environ)
 654     environ = envp;
 655 #endif /* SHARABLE_LIB_BUG */
 656 #endif /* LINK_CRTL_SHARE */
 657 #endif /* VMS */
 658
 659 #if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
 660   /* Extend the stack space available.
 661      Don't do that if dumping, since some systems (e.g. DJGPP)
 662      might define a smaller stack limit at that time.  */
 663   if (1
 664 #ifndef CANNOT_DUMP
 665       && (!noninteractive || initialized)
 666 #endif
 667       && !getrlimit (RLIMIT_STACK, &rlim))
 668     {
 669       long newlim;
 670       extern int re_max_failures;
 671       /* Approximate the amount regex.c needs per unit of re_max_failures.  */
 672       int ratio = 20 * sizeof (char *);
 673       /* Then add 33% to cover the size of the smaller stacks that regex.c
 674          successively allocates and discards, on its way to the maximum.  */
 675       ratio += ratio / 3;
 676       /* Add in some extra to cover
 677          what we're likely to use for other reasons.  */
 678       newlim = re_max_failures * ratio + 200000;
 679 #ifdef __NetBSD__
 680       /* NetBSD (at least NetBSD 1.2G and former) has a bug in its
 681        stack allocation routine for new process that the allocation
 682        fails if stack limit is not on page boundary.  So, round up the
 683        new limit to page boundary.  */
 684       newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize();
 685 #endif
 686       if (newlim > rlim.rlim_max)
 687         {
 688           newlim = rlim.rlim_max;
 689           /* Don't let regex.c overflow the stack we have.  */
 690           re_max_failures = (newlim - 200000) / ratio;
 691         }
 692       if (rlim.rlim_cur < newlim)
 693         rlim.rlim_cur = newlim;
 694
 695       setrlimit (RLIMIT_STACK, &rlim);
 696     }
 697 #endif /* HAVE_SETRLIMIT and RLIMIT_STACK */
 698
 699   /* Record (approximately) where the stack begins.  */
 700   stack_bottom = &stack_bottom_variable;
 701
 702 #ifdef USG_SHARED_LIBRARIES
 703   if (bss_end)
 704     brk ((void *)bss_end);
 705 #endif
 706
 707   clearerr (stdin);
 708
 709 #ifndef SYSTEM_MALLOC
 710   if (! initialized)
 711     {
 712       /* Arrange to get warning messages as memory fills up.  */
 713       memory_warnings (0, malloc_warning);
 714
 715       /* Arrange to disable interrupt input while malloc and friends are
 716          running.  */
 717       uninterrupt_malloc ();
 718     }
 719 #endif  /* not SYSTEM_MALLOC */
 720
 721 #ifdef MSDOS
 722   /* We do all file input/output as binary files.  When we need to translate
 723      newlines, we do that manually.  */
 724   _fmode = O_BINARY;
 725
 726 #if __DJGPP__ >= 2
 727   if (!isatty (fileno (stdin)))
 728     setmode (fileno (stdin), O_BINARY);
 729   if (!isatty (fileno (stdout)))
 730     {
 731       fflush (stdout);
 732       setmode (fileno (stdout), O_BINARY);
 733     }
 734 #else  /* not __DJGPP__ >= 2 */
 735   (stdin)->_flag &= ~_IOTEXT;
 736   (stdout)->_flag &= ~_IOTEXT;
 737   (stderr)->_flag &= ~_IOTEXT;
 738 #endif /* not __DJGPP__ >= 2 */
 739 #endif /* MSDOS */
 740
 741 #ifdef SET_EMACS_PRIORITY
 742   if (emacs_priority)
 743     nice (emacs_priority);
 744   setuid (getuid ());
 745 #endif /* SET_EMACS_PRIORITY */
 746
 747 #ifdef EXTRA_INITIALIZE
 748   EXTRA_INITIALIZE;
 749 #endif
 750
 751   inhibit_window_system = 0;
 752
 753   /* Handle the -t switch, which specifies filename to use as terminal */
 754   while (1)
 755     {
 756       char *term;
 757       if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
 758         {
 759           int result;
 760           close (0);
 761           close (1);
 762           result = open (term, O_RDWR, 2 );
 763           if (result < 0)
 764             {
 765               char *errstring = strerror (errno);
 766               fprintf (stderr, "emacs: %s: %s\n", term, errstring);
 767               exit (1);
 768             }
 769           dup (0);
 770           if (! isatty (0))
 771             {
 772               fprintf (stderr, "emacs: %s: not a tty\n", term);
 773               exit (1);
 774             }
 775           fprintf (stderr, "Using %s\n", term);
 776 #ifdef HAVE_WINDOW_SYSTEM
 777           inhibit_window_system = 1; /* -t => -nw */
 778 #endif
 779         }
 780       else
 781         break;
 782     }
 783
 784   if (argmatch (argv, argc, "-nw", "--no-windows", 6, NULL, &skip_args))
 785     inhibit_window_system = 1;
 786
 787   /* Handle the -batch switch, which means don't do interactive display.  */
 788   noninteractive = 0;
 789   if (argmatch (argv, argc, "-batch", "--batch", 5, NULL, &skip_args))
 790     noninteractive = 1;
 791
 792   /* Handle the --help option, which gives a usage message..  */
 793   if (argmatch (argv, argc, "-help", "--help", 3, NULL, &skip_args))
 794     {
 795       printf ("\
 796 Usage: %s [-t term] [--terminal term]  [-nw] [--no-windows]  [--batch]\n\
 797       [-q] [--no-init-file]  [-u user] [--user user]  [--debug-init]\n\
 798       [--unibyte] [--multibyte] [--version] [--no-site-file]\n\
 799       [-f func] [--funcall func]  [-l file] [--load file]  [--insert file]\n\
 800       [+linenum] file-to-visit  [--kill]\n\
 801 Report bugs to bug-gnu-emacs@gnu.org.  First, please see\n\
 802 the Bugs section of the Emacs manual or the file BUGS.\n", argv[0]);
 803       exit (0);
 804     }
 805
 806   if (! noninteractive)
 807     {
 808 #ifdef BSD_PGRPS
 809       if (initialized)
 810         {
 811           inherited_pgroup = EMACS_GETPGRP (0);
 812           setpgrp (0, getpid ());
 813         }
 814 #else
 815 #if defined (USG5) && defined (INTERRUPT_INPUT)
 816       setpgrp ();
 817 #endif
 818 #endif
 819     }
 820
 821 #ifdef POSIX_SIGNALS
 822   init_signals ();
 823 #endif
 824
 825   /* Don't catch SIGHUP if dumping.  */
 826   if (1
 827 #ifndef CANNOT_DUMP
 828       && initialized
 829 #endif
 830       )
 831     {
 832       sigblock (sigmask (SIGHUP));
 833       /* In --batch mode, don't catch SIGHUP if already ignored.
 834          That makes nohup work.  */
 835       if (! noninteractive
 836           || signal (SIGHUP, SIG_IGN) != SIG_IGN)
 837         signal (SIGHUP, fatal_error_signal);
 838       sigunblock (sigmask (SIGHUP));
 839     }
 840
 841   if (
 842 #ifndef CANNOT_DUMP
 843       ! noninteractive || initialized
 844 #else
 845       1
 846 #endif
 847       )
 848     {
 849       /* Don't catch these signals in batch mode if dumping.
 850          On some machines, this sets static data that would make
 851          signal fail to work right when the dumped Emacs is run.  */
 852       signal (SIGQUIT, fatal_error_signal);
 853       signal (SIGILL, fatal_error_signal);
 854       signal (SIGTRAP, fatal_error_signal);
 855 #ifdef SIGUSR1
 856       signal (SIGUSR1, handle_USR1_signal);
 857 #ifdef SIGUSR2
 858       signal (SIGUSR2, handle_USR2_signal);
 859 #endif
 860 #endif
 861 #ifdef SIGABRT
 862       signal (SIGABRT, fatal_error_signal);
 863 #endif
 864 #ifdef SIGHWE
 865       signal (SIGHWE, fatal_error_signal);
 866 #endif
 867 #ifdef SIGPRE
 868       signal (SIGPRE, fatal_error_signal);
 869 #endif
 870 #ifdef SIGORE
 871       signal (SIGORE, fatal_error_signal);
 872 #endif
 873 #ifdef SIGUME
 874       signal (SIGUME, fatal_error_signal);
 875 #endif
 876 #ifdef SIGDLK
 877       signal (SIGDLK, fatal_error_signal);
 878 #endif
 879 #ifdef SIGCPULIM
 880       signal (SIGCPULIM, fatal_error_signal);
 881 #endif
 882 #ifdef SIGIOT
 883       /* This is missing on some systems - OS/2, for example.  */
 884       signal (SIGIOT, fatal_error_signal);
 885 #endif
 886 #ifdef SIGEMT
 887       signal (SIGEMT, fatal_error_signal);
 888 #endif
 889       signal (SIGFPE, fatal_error_signal);
 890 #ifdef SIGBUS
 891       signal (SIGBUS, fatal_error_signal);
 892 #endif
 893       signal (SIGSEGV, fatal_error_signal);
 894 #ifdef SIGSYS
 895       signal (SIGSYS, fatal_error_signal);
 896 #endif
 897       signal (SIGTERM, fatal_error_signal);
 898 #ifdef SIGXCPU
 899       signal (SIGXCPU, fatal_error_signal);
 900 #endif
 901 #ifdef SIGXFSZ
 902       signal (SIGXFSZ, fatal_error_signal);
 903 #endif /* SIGXFSZ */
 904
 905 #ifdef SIGDANGER
 906       /* This just means available memory is getting low.  */
 907       signal (SIGDANGER, memory_warning_signal);
 908 #endif
 909
 910 #ifdef AIX
 911 /* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU.  */
 912       signal (SIGXCPU, fatal_error_signal);
 913 #ifndef _I386
 914       signal (SIGIOINT, fatal_error_signal);
 915 #endif
 916       signal (SIGGRANT, fatal_error_signal);
 917       signal (SIGRETRACT, fatal_error_signal);
 918       signal (SIGSOUND, fatal_error_signal);
 919       signal (SIGMSG, fatal_error_signal);
 920 #endif /* AIX */
 921     }
 922
 923   noninteractive1 = noninteractive;
 924
 925 /* Perform basic initializations (not merely interning symbols) */
 926
 927   if (!initialized)
 928     {
 929       init_alloc_once ();
 930       init_obarray ();
 931       init_eval_once ();
 932       init_charset_once ();
 933       init_coding_once ();
 934       init_syntax_once ();      /* Create standard syntax table.  */
 935       init_category_once ();    /* Create standard category table.  */
 936                       /* Must be done before init_buffer */
 937       init_casetab_once ();
 938       init_buffer_once ();      /* Create buffer table and some buffers */
 939       init_minibuf_once ();     /* Create list of minibuffers */
 940                               /* Must precede init_window_once */
 941       init_window_once ();      /* Init the window system */
 942     }
 943
 944   init_alloc ();
 945   init_eval ();
 946   init_coding ();
 947   init_data ();
 948   running_asynch_code = 0;
 949
 950   /* Handle --unibyte and the EMACS_UNIBYTE envvar,
 951      but not while dumping.  */
 952   if (
 953 #ifndef CANNOT_DUMP
 954       ! noninteractive || initialized
 955 #else
 956       1
 957 #endif
 958       )
 959     {
 960       int inhibit_unibyte = 0;
 961
 962       /* --multibyte overrides EMACS_UNIBYTE.  */
 963       if (argmatch (argv, argc, "-no-unibyte", "--no-unibyte", 4, NULL, &skip_args)
 964           || argmatch (argv, argc, "-multibyte", "--multibyte", 4, NULL, &skip_args))
 965         inhibit_unibyte = 1;
 966
 967       /* --unibyte requests that we set up to do everything with single-byte
 968          buffers and strings.  We need to handle this before calling
 969          init_lread, init_editfns and other places that generate Lisp strings
 970          from text in the environment.  */
 971       if (argmatch (argv, argc, "-unibyte", "--unibyte", 4, NULL, &skip_args)
 972           || argmatch (argv, argc, "-no-multibyte", "--no-multibyte", 4, NULL, &skip_args)
 973           || (getenv ("EMACS_UNIBYTE") && !inhibit_unibyte))
 974         {
 975           Lisp_Object old_log_max;
 976           Lisp_Object symbol, tail;
 977
 978           symbol = intern ("default-enable-multibyte-characters");
 979           Fset (symbol, Qnil);
 980
 981           if (initialized)
 982             {
 983               /* Erase pre-dump messages in *Messages* now so no abort.  */
 984               old_log_max = Vmessage_log_max;
 985               XSETFASTINT (Vmessage_log_max, 0);
 986               message_dolog ("", 0, 1, 0);
 987               Vmessage_log_max = old_log_max;
 988             }
 989
 990           for (tail = Vbuffer_alist; CONSP (tail);
 991                tail = XCONS (tail)->cdr)
 992             {
 993               Lisp_Object buffer;
 994
 995               buffer = Fcdr (XCONS (tail)->car);
 996               /* Verify that all buffers are empty now, as they
 997                  ought to be.  */
 998               if (BUF_Z (XBUFFER (buffer)) > BUF_BEG (XBUFFER (buffer)))
 999                 abort ();
1000               /* It is safe to do this crudely in an empty buffer.  */
1001               XBUFFER (buffer)->enable_multibyte_characters = Qnil;
1002             }
1003         }
1004     }
1005
1006   no_loadup
1007     = !argmatch (argv, argc, "-nl", "--no-loadup", 6, NULL, &skip_args);
1008
1009
1010 #ifdef HAVE_X_WINDOWS
1011   /* Stupid kludge to catch command-line display spec.  We can't
1012      handle this argument entirely in window system dependent code
1013      because we don't even know which window system dependent code
1014      to run until we've recognized this argument.  */
1015   {
1016     char *displayname = 0;
1017     int i;
1018     int count_before = skip_args;
1019
1020     /* Skip any number of -d options, but only use the last one.  */
1021     while (1)
1022       {
1023         int count_before_this = skip_args;
1024
1025         if (argmatch (argv, argc, "-d", "--display", 3, &displayname, &skip_args))
1026           display_arg = 1;
1027         else if (argmatch (argv, argc, "-display", 0, 3, &displayname, &skip_args))
1028           display_arg = 1;
1029         else
1030           break;
1031
1032         count_before = count_before_this;
1033       }
1034
1035     /* If we have the form --display=NAME,
1036        convert it into  -d name.
1037        This requires inserting a new element into argv.  */
1038     if (displayname != 0 && skip_args - count_before == 1)
1039       {
1040         char **new = (char **) xmalloc (sizeof (char *) * (argc + 2));
1041         int j;
1042
1043         for (j = 0; j < count_before + 1; j++)
1044           new[j] = argv[j];
1045         new[count_before + 1] = "-d";
1046         new[count_before + 2] = displayname;
1047         for (j = count_before + 2; j <argc; j++)
1048           new[j + 1] = argv[j];
1049         argv = new;
1050         argc++;
1051       }
1052     /* Change --display to -d, when its arg is separate.  */
1053     else if (displayname != 0 && skip_args > count_before
1054              && argv[count_before + 1][1] == '-')
1055       argv[count_before + 1] = "-d";
1056
1057     /* Don't actually discard this arg.  */
1058     skip_args = count_before;
1059   }
1060 #endif
1061
1062   /* argmatch must not be used after here,
1063      except when bulding temacs
1064      because the -d argument has not been skipped in skip_args.  */
1065
1066 #ifdef MSDOS
1067   /* Call early 'cause init_environment needs it.  */
1068   init_dosfns ();
1069   /* Set defaults for several environment variables.  */
1070   if (initialized)
1071     init_environment (argc, argv, skip_args);
1072   else
1073     tzset ();
1074 #endif /* MSDOS */
1075
1076 #ifdef WINDOWSNT
1077   /* Initialize environment from registry settings.  */
1078   init_environment ();
1079   init_ntproc ();       /* must precede init_editfns */
1080 #endif
1081
1082   /* egetenv is a pretty low-level facility, which may get called in
1083      many circumstances; it seems flimsy to put off initializing it
1084      until calling init_callproc.  */
1085   set_process_environment ();
1086   /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
1087      if this is not done.  Do it after set_process_environment so that we
1088      don't pollute Vprocess_environment.  */
1089 #ifdef AIX
1090   putenv ("LANG=C");
1091 #endif
1092
1093   init_buffer ();       /* Init default directory of main buffer */
1094
1095   init_callproc_1 ();   /* Must precede init_cmdargs and init_sys_modes.  */
1096   init_cmdargs (argc, argv, skip_args); /* Must precede init_lread.  */
1097
1098   if (initialized)
1099     {
1100       /* Erase any pre-dump messages in the message log, to avoid confusion */
1101       Lisp_Object old_log_max;
1102       old_log_max = Vmessage_log_max;
1103       XSETFASTINT (Vmessage_log_max, 0);
1104       message_dolog ("", 0, 1, 0);
1105       Vmessage_log_max = old_log_max;
1106     }
1107
1108   init_callproc ();     /* Must follow init_cmdargs but not init_sys_modes.  */
1109   init_lread ();
1110
1111   /* Intern the names of all standard functions and variables;
1112      define standard keys.  */
1113
1114   if (!initialized)
1115     {
1116       /* The basic levels of Lisp must come first */
1117       /* And data must come first of all
1118          for the sake of symbols like error-message */
1119       syms_of_data ();
1120       syms_of_alloc ();
1121       syms_of_lread ();
1122       syms_of_print ();
1123       syms_of_eval ();
1124       syms_of_fns ();
1125       syms_of_floatfns ();
1126
1127       syms_of_abbrev ();
1128       syms_of_buffer ();
1129       syms_of_bytecode ();
1130       syms_of_callint ();
1131       syms_of_casefiddle ();
1132       syms_of_casetab ();
1133       syms_of_callproc ();
1134       syms_of_category ();
1135       syms_of_ccl ();
1136       syms_of_charset ();
1137       syms_of_cmds ();
1138 #ifndef NO_DIR_LIBRARY
1139       syms_of_dired ();
1140 #endif /* not NO_DIR_LIBRARY */
1141       syms_of_display ();
1142       syms_of_doc ();
1143       syms_of_editfns ();
1144       syms_of_emacs ();
1145       syms_of_fileio ();
1146       syms_of_coding ();        /* This should be after syms_of_fileio.  */
1147 #ifdef CLASH_DETECTION
1148       syms_of_filelock ();
1149 #endif /* CLASH_DETECTION */
1150       syms_of_indent ();
1151       syms_of_insdel ();
1152       syms_of_keyboard ();
1153       syms_of_keymap ();
1154       syms_of_macros ();
1155       syms_of_marker ();
1156       syms_of_minibuf ();
1157       syms_of_mocklisp ();
1158       syms_of_process ();
1159       syms_of_search ();
1160       syms_of_frame ();
1161       syms_of_syntax ();
1162       syms_of_term ();
1163       syms_of_undo ();
1164
1165       /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
1166       syms_of_textprop ();
1167 #ifdef VMS
1168       syms_of_vmsproc ();
1169 #endif /* VMS */
1170 #ifdef WINDOWSNT
1171       syms_of_ntproc ();
1172 #endif /* WINDOWSNT */
1173       syms_of_window ();
1174       syms_of_xdisp ();
1175 #ifdef HAVE_X_WINDOWS
1176       syms_of_xterm ();
1177       syms_of_xfns ();
1178       syms_of_fontset ();
1179 #ifdef HAVE_X11
1180       syms_of_xselect ();
1181 #endif
1182 #endif /* HAVE_X_WINDOWS */
1183
1184 #ifndef HAVE_NTGUI
1185       syms_of_xfaces ();
1186       syms_of_xmenu ();
1187 #endif
1188
1189 #ifdef HAVE_NTGUI
1190       syms_of_w32term ();
1191       syms_of_w32fns ();
1192       syms_of_w32faces ();
1193       syms_of_w32select ();
1194       syms_of_w32menu ();
1195 #endif /* HAVE_NTGUI */
1196
1197 #ifdef SYMS_SYSTEM
1198       SYMS_SYSTEM;
1199 #endif
1200
1201 #ifdef SYMS_MACHINE
1202       SYMS_MACHINE;
1203 #endif
1204
1205       keys_of_casefiddle ();
1206       keys_of_cmds ();
1207       keys_of_buffer ();
1208       keys_of_keyboard ();
1209       keys_of_keymap ();
1210       keys_of_macros ();
1211       keys_of_minibuf ();
1212       keys_of_window ();
1213       keys_of_frame ();
1214     }
1215
1216   if (!noninteractive)
1217     {
1218 #ifdef VMS
1219       init_vms_input ();/* init_display calls get_frame_size, that needs this */
1220 #endif /* VMS */
1221       init_display ();  /* Determine terminal type.  init_sys_modes uses results */
1222     }
1223   init_keyboard ();     /* This too must precede init_sys_modes */
1224 #ifdef VMS
1225   init_vmsproc ();      /* And this too. */
1226 #endif /* VMS */
1227   init_sys_modes ();    /* Init system terminal modes (RAW or CBREAK, etc.) */
1228   init_xdisp ();
1229   init_macros ();
1230   init_editfns ();
1231 #ifdef LISP_FLOAT_TYPE
1232   init_floatfns ();
1233 #endif
1234 #ifdef VMS
1235   init_vmsfns ();
1236 #endif /* VMS */
1237   init_process ();
1238
1239   if (!initialized)
1240     {
1241       char *file;
1242       /* Handle -l loadup, args passed by Makefile. */
1243       if (argmatch (argv, argc, "-l", "--load", 3, &file, &skip_args))
1244         Vtop_level = Fcons (intern ("load"),
1245                             Fcons (build_string (file), Qnil));
1246 #ifdef CANNOT_DUMP
1247       /* Unless next switch is -nl, load "loadup.el" first thing.  */
1248       if (! no_loadup)
1249         Vtop_level = Fcons (intern ("load"),
1250                             Fcons (build_string ("loadup.el"), Qnil));
1251 #endif /* CANNOT_DUMP */
1252     }
1253
1254   if (initialized)
1255     {
1256 #ifdef HAVE_TZSET
1257       {
1258         /* If the execution TZ happens to be the same as the dump TZ,
1259            change it to some other value and then change it back,
1260            to force the underlying implementation to reload the TZ info.
1261            This is needed on implementations that load TZ info from files,
1262            since the TZ file contents may differ between dump and execution.  */
1263         char *tz = getenv ("TZ");
1264         if (tz && !strcmp (tz, dump_tz))
1265           {
1266             ++*tz;
1267             tzset ();
1268             --*tz;
1269           }
1270       }
1271 #endif
1272     }
1273
1274   /* Gerd Moellmann <gerd@acm.org> says this makes profiling work on
1275      FreeBSD.  It might work on some other systems too.
1276      Give it a try and tell me if it works on your system.  */
1277 #ifdef __FreeBSD__
1278 #ifdef PROFILING
1279   if (initialized)
1280     {
1281       extern void _mcleanup ();
1282       extern char etext;
1283       extern Lisp_Object Fredraw_frame ();
1284       atexit (_mcleanup);
1285       /* This uses Fredraw_frame because that function
1286          comes first in the Emacs executable.
1287          It might be better to use something that gives
1288          the start of the text segment, but start_of_text
1289          is not defined on all systems now.  */
1290       monstartup (Fredraw_frame, &etext);
1291     }
1292   else
1293     moncontrol (0);
1294 #endif
1295 #endif
1296
1297   initialized = 1;
1298
1299 #ifdef LOCALTIME_CACHE
1300   /* Some versions of localtime have a bug.  They cache the value of the time
1301      zone rather than looking it up every time.  Since localtime() is
1302      called to bolt the undumping time into the undumped emacs, this
1303      results in localtime ignoring the TZ environment variable.
1304      This flushes the new TZ value into localtime. */
1305   tzset ();
1306 #endif /* defined (LOCALTIME_CACHE) */
1307
1308   /* Enter editor command loop.  This never returns.  */
1309   Frecursive_edit ();
1310   /* NOTREACHED */
1311 }
1312 \f
1313 /* Sort the args so we can find the most important ones
1314    at the beginning of argv.  */
1315
1316 /* First, here's a table of all the standard options.  */
1317
1318 struct standard_args
1319 {
1320   char *name;
1321   char *longname;
1322   int priority;
1323   int nargs;
1324 };
1325
1326 struct standard_args standard_args[] =
1327 {
1328   { "-version", "--version", 150, 0 },
1329 #ifdef HAVE_SHM
1330   { "-nl", "--no-shared-memory", 140, 0 },
1331 #endif
1332 #ifdef VMS
1333   { "-map", "--map-data", 130, 0 },
1334 #endif
1335   { "-t", "--terminal", 120, 1 },
1336   { "-nw", "--no-windows", 110, 0 },
1337   { "-batch", "--batch", 100, 0 },
1338   { "-help", "--help", 90, 0 },
1339   { "-no-unibyte", "--no-unibyte", 83, 0 },
1340   { "-multibyte", "--multibyte", 82, 0 },
1341   { "-unibyte", "--unibyte", 81, 0 },
1342   { "-no-multibyte", "--no-multibyte", 80, 0 },
1343 #ifdef CANNOT_DUMP
1344   { "-nl", "--no-loadup", 70, 0 },
1345 #endif
1346   /* -d must come last before the options handled in startup.el.  */
1347   { "-d", "--display", 60, 1 },
1348   { "-display", 0, 60, 1 },
1349   /* Now for the options handled in startup.el.  */
1350   { "-q", "--no-init-file", 50, 0 },
1351   { "-no-init-file", 0, 50, 0 },
1352   { "-no-site-file", "--no-site-file", 40, 0 },
1353   { "-u", "--user", 30, 1 },
1354   { "-user", 0, 30, 1 },
1355   { "-debug-init", "--debug-init", 20, 0 },
1356   { "-i", "--icon-type", 15, 0 },
1357   { "-itype", 0, 15, 0 },
1358   { "-iconic", "--iconic", 15, 0 },
1359   { "-bg", "--background-color", 10, 1 },
1360   { "-background", 0, 10, 1 },
1361   { "-fg", "--foreground-color", 10, 1 },
1362   { "-foreground", 0, 10, 1 },
1363   { "-bd", "--border-color", 10, 1 },
1364   { "-bw", "--border-width", 10, 1 },
1365   { "-ib", "--internal-border", 10, 1 },
1366   { "-ms", "--mouse-color", 10, 1 },
1367   { "-cr", "--cursor-color", 10, 1 },
1368   { "-fn", "--font", 10, 1 },
1369   { "-font", 0, 10, 1 },
1370   { "-g", "--geometry", 10, 1 },
1371   { "-geometry", 0, 10, 1 },
1372   { "-T", "--title", 10, 1 },
1373   { "-title", 0, 10, 1 },
1374   { "-name", "--name", 10, 1 },
1375   { "-xrm", "--xrm", 10, 1 },
1376   { "-r", "--reverse-video", 5, 0 },
1377   { "-rv", 0, 5, 0 },
1378   { "-reverse", 0, 5, 0 },
1379   { "-hb", "--horizontal-scroll-bars", 5, 0 },
1380   { "-vb", "--vertical-scroll-bars", 5, 0 },
1381   /* These have the same priority as ordinary file name args,
1382      so they are not reordered with respect to those.  */
1383   { "-L", "--directory", 0, 1 },
1384   { "-directory", 0, 0, 1 },
1385   { "-l", "--load", 0, 1 },
1386   { "-load", 0, 0, 1 },
1387   { "-f", "--funcall", 0, 1 },
1388   { "-funcall", 0, 0, 1 },
1389   { "-eval", "--eval", 0, 1 },
1390   { "-find-file", "--find-file", 0, 1 },
1391   { "-visit", "--visit", 0, 1 },
1392   { "-insert", "--insert", 0, 1 },
1393   /* This should be processed after ordinary file name args and the like.  */
1394   { "-kill", "--kill", -10, 0 },
1395 };
1396
1397 /* Reorder the elements of ARGV (assumed to have ARGC elements)
1398    so that the highest priority ones come first.
1399    Do not change the order of elements of equal priority.
1400    If an option takes an argument, keep it and its argument together.
1401
1402    If an option that takes no argument appears more
1403    than once, eliminate all but one copy of it.  */
1404
1405 static void
1406 sort_args (argc, argv)
1407      int argc;
1408      char **argv;
1409 {
1410   char **new = (char **) xmalloc (sizeof (char *) * argc);
1411   /* For each element of argv,
1412      the corresponding element of options is:
1413      0 for an option that takes no arguments,
1414      1 for an option that takes one argument, etc.
1415      -1 for an ordinary non-option argument.  */
1416   int *options = (int *) xmalloc (sizeof (int) * argc);
1417   int *priority = (int *) xmalloc (sizeof (int) * argc);
1418   int to = 1;
1419   int incoming_used = 1;
1420   int from;
1421   int i;
1422   int end_of_options = argc;
1423
1424   /* Categorize all the options,
1425      and figure out which argv elts are option arguments.  */
1426   for (from = 1; from < argc; from++)
1427     {
1428       options[from] = -1;
1429       priority[from] = 0;
1430       if (argv[from][0] == '-')
1431         {
1432           int match, thislen;
1433           char *equals;
1434
1435           /* If we have found "--", don't consider
1436              any more arguments as options.  */
1437           if (argv[from][1] == '-' && argv[from][2] == 0)
1438             {
1439               /* Leave the "--", and everything following it, at the end.  */
1440               for (; from < argc; from++)
1441                 {
1442                   priority[from] = -100;
1443                   options[from] = -1;
1444                 }
1445               break;
1446             }
1447
1448           /* Look for a match with a known old-fashioned option.  */
1449           for (i = 0; i < sizeof (standard_args) / sizeof (standard_args[0]); i++)
1450             if (!strcmp (argv[from], standard_args[i].name))
1451               {
1452                 options[from] = standard_args[i].nargs;
1453                 priority[from] = standard_args[i].priority;
1454                 if (from + standard_args[i].nargs >= argc)
1455                   fatal ("Option `%s' requires an argument\n", argv[from]);
1456                 from += standard_args[i].nargs;
1457                 goto done;
1458               }
1459
1460           /* Look for a match with a known long option.
1461              MATCH is -1 if no match so far, -2 if two or more matches so far,
1462              >= 0 (the table index of the match) if just one match so far.  */
1463           if (argv[from][1] == '-')
1464             {
1465               match = -1;
1466               thislen = strlen (argv[from]);
1467               equals = index (argv[from], '=');
1468               if (equals != 0)
1469                 thislen = equals - argv[from];
1470
1471               for (i = 0;
1472                    i < sizeof (standard_args) / sizeof (standard_args[0]); i++)
1473                 if (standard_args[i].longname
1474                     && !strncmp (argv[from], standard_args[i].longname,
1475                                  thislen))
1476                   {
1477                     if (match == -1)
1478                       match = i;
1479                     else
1480                       match = -2;
1481                   }
1482
1483               /* If we found exactly one match, use that.  */
1484               if (match >= 0)
1485                 {
1486                   options[from] = standard_args[match].nargs;
1487                   priority[from] = standard_args[match].priority;
1488                   /* If --OPTION=VALUE syntax is used,
1489                      this option uses just one argv element.  */
1490                   if (equals != 0)
1491                     options[from] = 0;
1492                   if (from + options[from] >= argc)
1493                     fatal ("Option `%s' requires an argument\n", argv[from]);
1494                   from += options[from];
1495                 }
1496             }
1497         done: ;
1498         }
1499     }
1500
1501   /* Copy the arguments, in order of decreasing priority, to NEW.  */
1502   new[0] = argv[0];
1503   while (incoming_used < argc)
1504     {
1505       int best = -1;
1506       int best_priority = -9999;
1507
1508       /* Find the highest priority remaining option.
1509          If several have equal priority, take the first of them.  */
1510       for (from = 1; from < argc; from++)
1511         {
1512           if (argv[from] != 0 && priority[from] > best_priority)
1513             {
1514               best_priority = priority[from];
1515               best = from;
1516             }
1517           /* Skip option arguments--they are tied to the options.  */
1518           if (options[from] > 0)
1519             from += options[from];
1520         }
1521
1522       if (best < 0)
1523         abort ();
1524
1525       /* Copy the highest priority remaining option, with its args, to NEW.
1526          Unless it is a duplicate of the previous one.  */
1527       if (! (options[best] == 0
1528              && ! strcmp (new[to - 1], argv[best])))
1529         {
1530           new[to++] = argv[best];
1531           for (i = 0; i < options[best]; i++)
1532             new[to++] = argv[best + i + 1];
1533         }
1534
1535       incoming_used += 1 + (options[best] > 0 ? options[best] : 0);
1536
1537       /* Clear out this option in ARGV.  */
1538       argv[best] = 0;
1539       for (i = 0; i < options[best]; i++)
1540         argv[best + i + 1] = 0;
1541     }
1542
1543   bcopy (new, argv, sizeof (char *) * argc);
1544
1545   free (options);
1546   free (new);
1547   free (priority);
1548 }
1549 \f
1550 DEFUN ("kill-emacs", Fkill_emacs, Skill_emacs, 0, 1, "P",
1551   "Exit the Emacs job and kill it.\n\
1552 If ARG is an integer, return ARG as the exit program code.\n\
1553 If ARG is a  string, stuff it as keyboard input.\n\n\
1554 The value of `kill-emacs-hook', if not void,\n\
1555 is a list of functions (of no args),\n\
1556 all of which are called before Emacs is actually killed.")
1557   (arg)
1558      Lisp_Object arg;
1559 {
1560   Lisp_Object hook, hook1;
1561   int i;
1562   struct gcpro gcpro1;
1563
1564   GCPRO1 (arg);
1565
1566   if (feof (stdin))
1567     arg = Qt;
1568
1569   if (!NILP (Vrun_hooks) && !noninteractive)
1570     call1 (Vrun_hooks, intern ("kill-emacs-hook"));
1571
1572   UNGCPRO;
1573
1574 /* Is it really necessary to do this deassign
1575    when we are going to exit anyway?  */
1576 /* #ifdef VMS
1577   stop_vms_input ();
1578  #endif  */
1579
1580   shut_down_emacs (0, 0, STRINGP (arg) ? arg : Qnil);
1581
1582   /* If we have an auto-save list file,
1583      kill it because we are exiting Emacs deliberately (not crashing).
1584      Do it after shut_down_emacs, which does an auto-save.  */
1585   if (STRINGP (Vauto_save_list_file_name))
1586     unlink (XSTRING (Vauto_save_list_file_name)->data);
1587
1588   exit (INTEGERP (arg) ? XINT (arg)
1589 #ifdef VMS
1590         : 1
1591 #else
1592         : 0
1593 #endif
1594         );
1595   /* NOTREACHED */
1596 }
1597
1598
1599 /* Perform an orderly shutdown of Emacs.  Autosave any modified
1600    buffers, kill any child processes, clean up the terminal modes (if
1601    we're in the foreground), and other stuff like that.  Don't perform
1602    any redisplay; this may be called when Emacs is shutting down in
1603    the background, or after its X connection has died.
1604
1605    If SIG is a signal number, print a message for it.
1606
1607    This is called by fatal signal handlers, X protocol error handlers,
1608    and Fkill_emacs.  */
1609
1610 void
1611 shut_down_emacs (sig, no_x, stuff)
1612      int sig, no_x;
1613      Lisp_Object stuff;
1614 {
1615   /* Prevent running of hooks from now on.  */
1616   Vrun_hooks = Qnil;
1617
1618   /* If we are controlling the terminal, reset terminal modes */
1619 #ifdef EMACS_HAVE_TTY_PGRP
1620   {
1621     int pgrp = EMACS_GETPGRP (0);
1622
1623     int tpgrp;
1624     if (EMACS_GET_TTY_PGRP (0, &tpgrp) != -1
1625         && tpgrp == pgrp)
1626       {
1627         fflush (stdout);
1628         reset_sys_modes ();
1629         if (sig && sig != SIGTERM)
1630           fprintf (stderr, "Fatal error (%d).", sig);
1631       }
1632   }
1633 #else
1634   fflush (stdout);
1635   reset_sys_modes ();
1636 #endif
1637
1638   stuff_buffered_input (stuff);
1639
1640   kill_buffer_processes (Qnil);
1641   Fdo_auto_save (Qt, Qnil);
1642
1643 #ifdef CLASH_DETECTION
1644   unlock_all_files ();
1645 #endif
1646
1647 #ifdef VMS
1648   kill_vms_processes ();
1649 #endif
1650
1651 #if 0 /* This triggers a bug in XCloseDisplay and is not needed.  */
1652 #ifdef HAVE_X_WINDOWS
1653   /* It's not safe to call intern here.  Maybe we are crashing.  */
1654   if (!noninteractive && SYMBOLP (Vwindow_system)
1655       && XSYMBOL (Vwindow_system)->name->size == 1
1656       && XSYMBOL (Vwindow_system)->name->data[0] == 'x'
1657       && ! no_x)
1658     Fx_close_current_connection ();
1659 #endif /* HAVE_X_WINDOWS */
1660 #endif
1661
1662 #ifdef SIGIO
1663   /* There is a tendency for a SIGIO signal to arrive within exit,
1664      and cause a SIGHUP because the input descriptor is already closed.  */
1665   unrequest_sigio ();
1666   signal (SIGIO, SIG_IGN);
1667 #endif
1668
1669 #ifdef WINDOWSNT
1670   term_ntproc ();
1671 #endif
1672
1673 #ifdef MSDOS
1674   dos_cleanup ();
1675 #endif
1676 }
1677
1678
1679 \f
1680 #ifndef CANNOT_DUMP
1681
1682 #ifdef HAVE_SHM
1683
1684 DEFUN ("dump-emacs-data", Fdump_emacs_data, Sdump_emacs_data, 1, 1, 0,
1685   "Dump current state of Emacs into data file FILENAME.\n\
1686 This function exists on systems that use HAVE_SHM.")
1687   (filename)
1688      Lisp_Object filename;
1689 {
1690   extern char my_edata[];
1691   Lisp_Object tem;
1692
1693   CHECK_STRING (filename, 0);
1694   filename = Fexpand_file_name (filename, Qnil);
1695
1696   tem = Vpurify_flag;
1697   Vpurify_flag = Qnil;
1698
1699   fflush (stdout);
1700   /* Tell malloc where start of impure now is */
1701   /* Also arrange for warnings when nearly out of space.  */
1702 #ifndef SYSTEM_MALLOC
1703   memory_warnings (my_edata, malloc_warning);
1704 #endif
1705   map_out_data (XSTRING (filename)->data);
1706
1707   Vpurify_flag = tem;
1708
1709   return Qnil;
1710 }
1711
1712 #else /* not HAVE_SHM */
1713
1714 DEFUN ("dump-emacs", Fdump_emacs, Sdump_emacs, 2, 2, 0,
1715   "Dump current state of Emacs into executable file FILENAME.\n\
1716 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
1717 This is used in the file `loadup.el' when building Emacs.\n\
1718 \n\
1719 You must run Emacs in batch mode in order to dump it.")
1720   (filename, symfile)
1721      Lisp_Object filename, symfile;
1722 {
1723   extern char my_edata[];
1724   Lisp_Object tem;
1725   Lisp_Object symbol;
1726   int count = specpdl_ptr - specpdl;
1727
1728   if (! noninteractive)
1729     error ("Dumping Emacs works only in batch mode");
1730
1731   /* Bind `command-line-processed' to nil before dumping,
1732      so that the dumped Emacs will process its command line
1733      and set up to work with X windows if appropriate.  */
1734   symbol = intern ("command-line-process");
1735   specbind (symbol, Qnil);
1736
1737   CHECK_STRING (filename, 0);
1738   filename = Fexpand_file_name (filename, Qnil);
1739   if (!NILP (symfile))
1740     {
1741       CHECK_STRING (symfile, 0);
1742       if (XSTRING (symfile)->size)
1743         symfile = Fexpand_file_name (symfile, Qnil);
1744     }
1745
1746   tem = Vpurify_flag;
1747   Vpurify_flag = Qnil;
1748
1749 #ifdef HAVE_TZSET
1750   set_time_zone_rule (dump_tz);
1751 #ifndef LOCALTIME_CACHE
1752   /* Force a tz reload, since set_time_zone_rule doesn't.  */
1753   tzset ();
1754 #endif
1755 #endif
1756
1757   fflush (stdout);
1758 #ifdef VMS
1759   mapout_data (XSTRING (filename)->data);
1760 #else
1761   /* Tell malloc where start of impure now is */
1762   /* Also arrange for warnings when nearly out of space.  */
1763 #ifndef SYSTEM_MALLOC
1764 #ifndef WINDOWSNT
1765   /* On Windows, this was done before dumping, and that once suffices.
1766      Meanwhile, my_edata is not valid on Windows.  */
1767   memory_warnings (my_edata, malloc_warning);
1768 #endif /* not WINDOWSNT */
1769 #endif
1770 #ifdef DOUG_LEA_MALLOC
1771   malloc_state_ptr = malloc_get_state ();
1772 #endif
1773   unexec (XSTRING (filename)->data,
1774           !NILP (symfile) ? XSTRING (symfile)->data : 0, my_edata, 0, 0);
1775 #ifdef DOUG_LEA_MALLOC
1776   free (malloc_state_ptr);
1777 #endif
1778 #endif /* not VMS */
1779
1780   Vpurify_flag = tem;
1781
1782   return unbind_to (count, Qnil);
1783 }
1784
1785 #endif /* not HAVE_SHM */
1786
1787 #endif /* not CANNOT_DUMP */
1788 \f
1789 #ifndef SEPCHAR
1790 #define SEPCHAR ':'
1791 #endif
1792
1793 Lisp_Object
1794 decode_env_path (evarname, defalt)
1795      char *evarname, *defalt;
1796 {
1797   register char *path, *p;
1798   Lisp_Object lpath, element, tem;
1799
1800   /* It's okay to use getenv here, because this function is only used
1801      to initialize variables when Emacs starts up, and isn't called
1802      after that.  */
1803   if (evarname != 0)
1804     path = (char *) getenv (evarname);
1805   else
1806     path = 0;
1807   if (!path)
1808     path = defalt;
1809 #ifdef DOS_NT
1810   /* Ensure values from the environment use the proper directory separator.  */
1811   if (path)
1812     {
1813       p = alloca (strlen (path) + 1);
1814       strcpy (p, path);
1815       path = p;
1816
1817       if ('/' == DIRECTORY_SEP)
1818         dostounix_filename (path);
1819       else
1820         unixtodos_filename (path);
1821     }
1822 #endif
1823   lpath = Qnil;
1824   while (1)
1825     {
1826       p = index (path, SEPCHAR);
1827       if (!p) p = path + strlen (path);
1828       element = (p - path ? make_string (path, p - path)
1829                  : build_string ("."));
1830
1831       /* Add /: to the front of the name
1832          if it would otherwise be treated as magic.  */
1833       tem = Ffind_file_name_handler (element, Qt);
1834       if (! NILP (tem))
1835         element = concat2 (build_string ("/:"), element);
1836
1837       lpath = Fcons (element, lpath);
1838       if (*p)
1839         path = p + 1;
1840       else
1841         break;
1842     }
1843   return Fnreverse (lpath);
1844 }
1845
1846 void
1847 syms_of_emacs ()
1848 {
1849   Qfile_name_handler_alist = intern ("file-name-handler-alist");
1850   staticpro (&Qfile_name_handler_alist);
1851
1852 #ifndef CANNOT_DUMP
1853 #ifdef HAVE_SHM
1854   defsubr (&Sdump_emacs_data);
1855 #else
1856   defsubr (&Sdump_emacs);
1857 #endif
1858 #endif
1859
1860   defsubr (&Skill_emacs);
1861
1862   defsubr (&Sinvocation_name);
1863   defsubr (&Sinvocation_directory);
1864
1865   DEFVAR_LISP ("command-line-args", &Vcommand_line_args,
1866     "Args passed by shell to Emacs, as a list of strings.");
1867
1868   DEFVAR_LISP ("system-type", &Vsystem_type,
1869     "Value is symbol indicating type of operating system you are using.");
1870   Vsystem_type = intern (SYSTEM_TYPE);
1871
1872   DEFVAR_LISP ("system-configuration", &Vsystem_configuration,
1873     "Value is string indicating configuration Emacs was built for.");
1874   Vsystem_configuration = build_string (EMACS_CONFIGURATION);
1875
1876   DEFVAR_LISP ("system-configuration-options", &Vsystem_configuration_options,
1877     "String containing the configuration options Emacs was built with.");
1878   Vsystem_configuration_options = build_string (EMACS_CONFIG_OPTIONS);
1879
1880   DEFVAR_BOOL ("noninteractive", &noninteractive1,
1881     "Non-nil means Emacs is running without interactive terminal.");
1882
1883   DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook,
1884     "Hook to be run whenever kill-emacs is called.\n\
1885 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
1886 in other similar situations), functions placed on this hook should not\n\
1887 expect to be able to interact with the user.  To ask for confirmation,\n\
1888 see `kill-emacs-query-functions' instead.");
1889   Vkill_emacs_hook = Qnil;
1890
1891 #ifdef SIGUSR1
1892   DEFVAR_LISP ("signal-USR1-hook", &Vsignal_USR1_hook,
1893     "Hook to be run whenever emacs receives a USR1 signal");
1894   Vsignal_USR1_hook = Qnil;
1895 #ifdef SIGUSR2
1896   DEFVAR_LISP ("signal-USR2-hook", &Vsignal_USR2_hook,
1897     "Hook to be run whenever emacs receives a USR2 signal");
1898   Vsignal_USR2_hook = Qnil;
1899 #endif
1900 #endif
1901
1902
1903   DEFVAR_INT ("emacs-priority", &emacs_priority,
1904     "Priority for Emacs to run at.\n\
1905 This value is effective only if set before Emacs is dumped,\n\
1906 and only if the Emacs executable is installed with setuid to permit\n\
1907 it to change priority.  (Emacs sets its uid back to the real uid.)\n\
1908 Currently, you need to define SET_EMACS_PRIORITY in `config.h'\n\
1909 before you compile Emacs, to enable the code for this feature.");
1910   emacs_priority = 0;
1911
1912   DEFVAR_LISP ("path-separator", &Vpath_separator,
1913     "The directory separator in search paths, as a string.");
1914   {
1915     char c = SEPCHAR;
1916     Vpath_separator = make_string (&c, 1);
1917   }
1918
1919   DEFVAR_LISP ("invocation-name", &Vinvocation_name,
1920     "The program name that was used to run Emacs.\n\
1921 Any directory names are omitted.");
1922
1923   DEFVAR_LISP ("invocation-directory", &Vinvocation_directory,
1924     "The directory in which the Emacs executable was found, to run it.\n\
1925 The value is nil if that directory's name is not known.");
1926
1927   DEFVAR_LISP ("installation-directory", &Vinstallation_directory,
1928     "A directory within which to look for the `lib-src' and `etc' directories.\n\
1929 This is non-nil when we can't find those directories in their standard\n\
1930 installed locations, but we can find them\n\
1931 near where the Emacs executable was found.");
1932   Vinstallation_directory = Qnil;
1933 }