src/emacs.c

   1 /* Fully extensible Emacs, running on Unix, intended for GNU.
   2    Copyright (C) 1985, 1986, 1987, 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include <signal.h>
  22 #include <errno.h>
  23
  24 #include "config.h"
  25 #include <stdio.h>
  26
  27 #include <sys/types.h>
  28 #include <sys/file.h>
  29
  30 #ifdef VMS
  31 #include <ssdef.h>
  32 #endif
  33
  34 #ifdef BSD
  35 #include <sys/ioctl.h>
  36 #endif
  37
  38 #ifdef APOLLO
  39 #ifndef APOLLO_SR10
  40 #include <default_acl.h>
  41 #endif
  42 #endif
  43
  44 #include "lisp.h"
  45 #include "commands.h"
  46 #include "intervals.h"
  47
  48 #include "systty.h"
  49 #include "syssignal.h"
  50
  51 #ifndef O_RDWR
  52 #define O_RDWR 2
  53 #endif
  54
  55 /* Command line args from shell, as list of strings */
  56 Lisp_Object Vcommand_line_args;
  57
  58 /* The name under which Emacs was invoked, with any leading directory
  59    names discarded.  */
  60 Lisp_Object Vinvocation_name;
  61
  62 /* Hook run by `kill-emacs' before it does really anything.  */
  63 Lisp_Object Vkill_emacs_hook;
  64
  65 /* Set nonzero after Emacs has started up the first time.
  66   Prevents reinitialization of the Lisp world and keymaps
  67   on subsequent starts.  */
  68 int initialized;
  69
  70 /* Variable whose value is symbol giving operating system type */
  71 Lisp_Object Vsystem_type;
  72
  73 /* If non-zero, emacs should not attempt to use an window-specific code,
  74    but instead should use the virtual terminal under which it was started */
  75 int inhibit_window_system;
  76
  77 /* If nonzero, set Emacs to run at this priority.  This is also used
  78    in child_setup and sys_suspend to make sure subshells run at normal
  79    priority; Those functions have their own extern declaration.  */
  80 int emacs_priority;
  81
  82 #ifdef BSD
  83 /* See sysdep.c.  */
  84 extern int inherited_pgroup;
  85 #endif
  86
  87 #ifdef HAVE_X_WINDOWS
  88 /* If non-zero, -d was specified, meaning we're using some window system. */
  89 int display_arg;
  90 #endif
  91
  92 /* An address near the bottom of the stack.
  93    Tells GC how to save a copy of the stack.  */
  94 char *stack_bottom;
  95
  96 #ifdef HAVE_X_WINDOWS
  97 extern Lisp_Object Vwindow_system;
  98 #endif /* HAVE_X_WINDOWS */
  99
 100 #ifdef USG_SHARED_LIBRARIES
 101 /* If nonzero, this is the place to put the end of the writable segment
 102    at startup.  */
 103
 104 unsigned int bss_end = 0;
 105 #endif
 106
 107 /* Nonzero means running Emacs without interactive terminal.  */
 108
 109 int noninteractive;
 110
 111 /* Value of Lisp variable `noninteractive'.
 112    Normally same as C variable `noninteractive'
 113    but nothing terrible happens if user sets this one.  */
 114
 115 int noninteractive1;
 116 \f
 117 /* Signal code for the fatal signal that was received */
 118 int fatal_error_code;
 119
 120 /* Nonzero if handling a fatal error already */
 121 int fatal_error_in_progress;
 122
 123 /* Handle bus errors, illegal instruction, etc. */
 124 SIGTYPE
 125 fatal_error_signal (sig)
 126      int sig;
 127 {
 128   fatal_error_code = sig;
 129   signal (sig, SIG_DFL);
 130
 131   /* If fatal error occurs in code below, avoid infinite recursion.  */
 132   if (! fatal_error_in_progress)
 133     {
 134       fatal_error_in_progress = 1;
 135
 136       shut_down_emacs (sig, 0, Qnil);
 137     }
 138
 139 #ifdef VMS
 140   LIB$STOP (SS$_ABORT);
 141 #else
 142   /* Signal the same code; this time it will really be fatal.
 143      Remember that since we're in a signal handler, the signal we're
 144      going to send is probably blocked, so we have to unblock it if we
 145      want to really receive it.  */
 146   sigunblock (sigmask (fatal_error_code));
 147   kill (getpid (), fatal_error_code);
 148 #endif /* not VMS */
 149 }
 150 \f
 151 /* Code for dealing with Lisp access to the Unix command line */
 152
 153 static
 154 init_cmdargs (argc, argv, skip_args)
 155      int argc;
 156      char **argv;
 157      int skip_args;
 158 {
 159   register int i;
 160
 161   Vinvocation_name = Ffile_name_nondirectory (build_string (argv[0]));
 162
 163   Vcommand_line_args = Qnil;
 164
 165   for (i = argc - 1; i >= 0; i--)
 166     {
 167       if (i == 0 || i > skip_args)
 168         Vcommand_line_args
 169           = Fcons (build_string (argv[i]), Vcommand_line_args);
 170     }
 171 }
 172
 173 DEFUN ("invocation-name", Finvocation_name, Sinvocation_name, 0, 0, 0,
 174   "Return the program name that was used to run Emacs.\n\
 175 Any directory names are omitted.")
 176   ()
 177 {
 178   return Fcopy_sequence (Vinvocation_name);
 179 }
 180
 181 \f
 182 #ifdef VMS
 183 #ifdef LINK_CRTL_SHARE
 184 #ifdef SHAREABLE_LIB_BUG
 185 extern noshare char **environ;
 186 #endif /* SHAREABLE_LIB_BUG */
 187 #endif /* LINK_CRTL_SHARE */
 188 #endif /* VMS */
 189
 190 #ifndef ORDINARY_LINK
 191 /* We don't include crtbegin.o and crtend.o in the link,
 192    so these functions and variables might be missed.
 193    Provide dummy definitions to avoid error.
 194    (We don't have any real constructors or destructors.)  */
 195 #ifdef __GNUC__
 196 __do_global_ctors ()
 197 {}
 198 __do_global_ctors_aux ()
 199 {}
 200 __do_global_dtors ()
 201 {}
 202 char * __CTOR_LIST__[2] = { (char *) (-1), 0 };
 203 char * __DTOR_LIST__[2] = { (char *) (-1), 0 };
 204 __main ()
 205 {}
 206 #endif /* __GNUC__ */
 207 #endif /* ORDINARY_LINK */
 208
 209 /* ARGSUSED */
 210 main (argc, argv, envp)
 211      int argc;
 212      char **argv;
 213      char **envp;
 214 {
 215   char stack_bottom_variable;
 216   int skip_args = 0;
 217   extern int errno;
 218   extern sys_nerr;
 219   extern char *sys_errlist[];
 220   extern void malloc_warning ();
 221
 222 /* Map in shared memory, if we are using that.  */
 223 #ifdef HAVE_SHM
 224   if (argc > 1 && !strcmp (argv[1], "-nl"))
 225     {
 226       map_in_data (0);
 227       /* The shared memory was just restored, which clobbered this.  */
 228       skip_args = 1;
 229     }
 230   else
 231     {
 232       map_in_data (1);
 233       /* The shared memory was just restored, which clobbered this.  */
 234       skip_args = 0;
 235     }
 236 #endif
 237
 238 #ifdef NeXT
 239   extern int malloc_cookie;
 240
 241   /* This helps out unexnext.c.  */
 242   if (initialized)
 243     if (malloc_jumpstart (malloc_cookie) != 0)
 244       printf ("malloc jumpstart failed!\n");
 245 #endif /* NeXT */
 246
 247 #ifdef HAVE_X_WINDOWS
 248   /* Stupid kludge to catch command-line display spec.  We can't
 249      handle this argument entirely in window system dependent code
 250      because we don't even know which window system dependent code
 251      to run until we've recognized this argument.  */
 252   {
 253     int i;
 254
 255     for (i = 1; (i < argc && ! display_arg); i++)
 256       if (!strcmp (argv[i], "-d") || !strcmp (argv[i], "-display"))
 257         display_arg = 1;
 258   }
 259 #endif
 260
 261 #ifdef VMS
 262   /* If -map specified, map the data file in */
 263   if (argc > 2 && ! strcmp (argv[1], "-map"))
 264     {
 265       skip_args = 2;
 266       mapin_data (argv[2]);
 267     }
 268
 269 #ifdef LINK_CRTL_SHARE
 270 #ifdef SHAREABLE_LIB_BUG
 271   /* Bletcherous shared libraries! */
 272   if (!stdin)
 273     stdin = fdopen (0, "r");
 274   if (!stdout)
 275     stdout = fdopen (1, "w");
 276   if (!stderr)
 277     stderr = fdopen (2, "w");
 278   if (!environ)
 279     environ = envp;
 280 #endif /* SHAREABLE_LIB_BUG */
 281 #endif /* LINK_CRTL_SHARE */
 282 #endif /* VMS */
 283
 284   /* Record (approximately) where the stack begins.  */
 285   stack_bottom = &stack_bottom_variable;
 286
 287 #ifdef RUN_TIME_REMAP
 288   if (initialized)
 289     run_time_remap (argv[0]);
 290 #endif
 291
 292 #ifdef USG_SHARED_LIBRARIES
 293   if (bss_end)
 294     brk (bss_end);
 295 #endif
 296
 297   clearerr (stdin);
 298
 299 #ifdef BSD
 300   {
 301     inherited_pgroup = getpgrp (0);
 302     setpgrp (0, getpid ());
 303   }
 304 #endif
 305
 306
 307 #ifdef APOLLO
 308 #ifndef APOLLO_SR10
 309   /* If USE_DOMAIN_ACLS environment variable exists,
 310      use ACLs rather than UNIX modes. */
 311   if (egetenv ("USE_DOMAIN_ACLS"))
 312     default_acl (USE_DEFACL);
 313 #endif
 314 #endif /* APOLLO */
 315
 316 #ifndef SYSTEM_MALLOC
 317   if (! initialized)
 318     {
 319       /* Arrange to get warning messages as memory fills up.  */
 320       memory_warnings (0, malloc_warning);
 321
 322       /* Arrange to disable interrupt input while malloc and friends are
 323          running.  */
 324       uninterrupt_malloc ();
 325     }
 326 #endif  /* not SYSTEM_MALLOC */
 327
 328 #ifdef PRIO_PROCESS
 329   if (emacs_priority)
 330     nice (emacs_priority);
 331   setuid (getuid ());
 332 #endif /* PRIO_PROCESS */
 333
 334   inhibit_window_system = 0;
 335
 336   /* Handle the -t switch, which specifies filename to use as terminal */
 337   if (skip_args + 2 < argc && !strcmp (argv[skip_args + 1], "-t"))
 338     {
 339       int result;
 340       skip_args += 2;
 341       close (0);
 342       close (1);
 343       result = open (argv[skip_args], O_RDWR, 2 );
 344       if (result < 0)
 345         {
 346           char *errstring;
 347
 348           if (errno >= 0 && errno < sys_nerr)
 349             errstring = sys_errlist[errno];
 350           else
 351             errstring = "undocumented error code";
 352           fprintf (stderr, "emacs: %s: %s\n", argv[skip_args], errstring);
 353           exit (1);
 354         }
 355       dup (0);
 356       if (! isatty (0))
 357         {
 358           fprintf (stderr, "emacs: %s: not a tty\n", argv[skip_args]);
 359           exit (1);
 360         }
 361       fprintf (stderr, "Using %s\n", argv[skip_args]);
 362 #ifdef HAVE_X_WINDOWS
 363       inhibit_window_system = 1;        /* -t => -nw */
 364 #endif
 365     }
 366
 367   if (skip_args + 1 < argc
 368       && (!strcmp (argv[skip_args + 1], "-nw")))
 369     {
 370       skip_args += 1;
 371       inhibit_window_system = 1;
 372     }
 373
 374 /* Handle the -batch switch, which means don't do interactive display.  */
 375   noninteractive = 0;
 376   if (skip_args + 1 < argc && !strcmp (argv[skip_args + 1], "-batch"))
 377     {
 378       skip_args += 1;
 379       noninteractive = 1;
 380     }
 381
 382 #ifdef POSIX_SIGNALS
 383   init_signals ();
 384 #endif
 385
 386   if (
 387 #ifndef CANNOT_DUMP
 388       ! noninteractive || initialized
 389 #else
 390       1
 391 #endif
 392       )
 393     {
 394       /* Don't catch these signals in batch mode if not initialized.
 395          On some machines, this sets static data that would make
 396          signal fail to work right when the dumped Emacs is run.  */
 397       signal (SIGHUP, fatal_error_signal);
 398       signal (SIGQUIT, fatal_error_signal);
 399       signal (SIGILL, fatal_error_signal);
 400       signal (SIGTRAP, fatal_error_signal);
 401 #ifdef SIGIOT
 402       /* This is missing on some systems - OS/2, for example.  */
 403       signal (SIGIOT, fatal_error_signal);
 404 #endif
 405 #ifdef SIGEMT
 406       signal (SIGEMT, fatal_error_signal);
 407 #endif
 408       signal (SIGFPE, fatal_error_signal);
 409 #ifdef SIGBUS
 410       signal (SIGBUS, fatal_error_signal);
 411 #endif
 412       signal (SIGSEGV, fatal_error_signal);
 413 #ifdef SIGSYS
 414       signal (SIGSYS, fatal_error_signal);
 415 #endif
 416       signal (SIGTERM, fatal_error_signal);
 417 #ifdef SIGXCPU
 418       signal (SIGXCPU, fatal_error_signal);
 419 #endif
 420 #ifdef SIGXFSZ
 421       signal (SIGXFSZ, fatal_error_signal);
 422 #endif /* SIGXFSZ */
 423
 424 #ifdef AIX
 425       signal (SIGDANGER, fatal_error_signal);
 426       signal (20, fatal_error_signal);
 427       signal (21, fatal_error_signal);
 428       signal (22, fatal_error_signal);
 429       signal (23, fatal_error_signal);
 430       signal (24, fatal_error_signal);
 431 #ifdef SIGIO
 432       signal (SIGAIO, fatal_error_signal);
 433       signal (SIGPTY, fatal_error_signal);
 434 #endif
 435 #ifndef _I386
 436       signal (SIGIOINT, fatal_error_signal);
 437 #endif
 438       signal (SIGGRANT, fatal_error_signal);
 439       signal (SIGRETRACT, fatal_error_signal);
 440       signal (SIGSOUND, fatal_error_signal);
 441       signal (SIGMSG, fatal_error_signal);
 442 #endif /* AIX */
 443     }
 444
 445   noninteractive1 = noninteractive;
 446
 447 /* Perform basic initializations (not merely interning symbols) */
 448
 449   if (!initialized)
 450     {
 451       init_alloc_once ();
 452       init_obarray ();
 453       init_eval_once ();
 454       init_syntax_once ();      /* Create standard syntax table.  */
 455                       /* Must be done before init_buffer */
 456       init_casetab_once ();
 457       init_buffer_once ();      /* Create buffer table and some buffers */
 458       init_minibuf_once ();     /* Create list of minibuffers */
 459                               /* Must precede init_window_once */
 460       init_window_once ();      /* Init the window system */
 461     }
 462
 463   init_alloc ();
 464   init_eval ();
 465   init_data ();
 466
 467   /* egetenv is a pretty low-level facility, which may get called in
 468      many circumstances; it seems flimsy to put off initializing it
 469      until calling init_callproc.  */
 470   set_process_environment ();
 471
 472   init_lread ();
 473
 474   init_cmdargs (argc, argv, skip_args); /* Create list Vcommand_line_args */
 475   init_buffer ();       /* Init default directory of main buffer */
 476   if (!noninteractive)
 477     {
 478 #ifdef VMS
 479       init_vms_input ();/* init_display calls get_frame_size, that needs this */
 480 #endif /* VMS */
 481       init_display ();  /* Determine terminal type.  init_sys_modes uses results */
 482     }
 483   init_keyboard ();     /* This too must precede init_sys_modes */
 484   init_callproc ();     /* And this too. */
 485 #ifdef VMS
 486   init_vmsproc ();      /* And this too. */
 487 #endif /* VMS */
 488   init_sys_modes ();    /* Init system terminal modes (RAW or CBREAK, etc.) */
 489   init_xdisp ();
 490   init_macros ();
 491   init_editfns ();
 492 #ifdef LISP_FLOAT_TYPE
 493   init_floatfns ();
 494 #endif
 495 #ifdef VMS
 496   init_vmsfns ();
 497 #endif /* VMS */
 498   init_process ();
 499 #ifdef CLASH_DETECTION
 500   init_filelock ();
 501 #endif /* CLASH_DETECTION */
 502
 503 /* Intern the names of all standard functions and variables; define standard keys */
 504
 505   if (!initialized)
 506     {
 507       /* The basic levels of Lisp must come first */
 508       /* And data must come first of all
 509          for the sake of symbols like error-message */
 510       syms_of_data ();
 511       syms_of_alloc ();
 512       syms_of_lread ();
 513       syms_of_print ();
 514       syms_of_eval ();
 515       syms_of_fns ();
 516 #ifdef LISP_FLOAT_TYPE
 517       syms_of_floatfns ();
 518 #endif
 519
 520       syms_of_abbrev ();
 521       syms_of_buffer ();
 522       syms_of_bytecode ();
 523       syms_of_callint ();
 524       syms_of_casefiddle ();
 525       syms_of_casetab ();
 526       syms_of_callproc ();
 527       syms_of_cmds ();
 528 #ifndef NO_DIR_LIBRARY
 529       syms_of_dired ();
 530 #endif /* not NO_DIR_LIBRARY */
 531       syms_of_display ();
 532       syms_of_doc ();
 533       syms_of_editfns ();
 534       syms_of_emacs ();
 535       syms_of_fileio ();
 536 #ifdef CLASH_DETECTION
 537       syms_of_filelock ();
 538 #endif /* CLASH_DETECTION */
 539       syms_of_indent ();
 540       syms_of_keyboard ();
 541       syms_of_keymap ();
 542       syms_of_macros ();
 543       syms_of_marker ();
 544       syms_of_minibuf ();
 545       syms_of_mocklisp ();
 546       syms_of_process ();
 547       syms_of_search ();
 548       syms_of_frame ();
 549       syms_of_syntax ();
 550       syms_of_undo ();
 551
 552       /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
 553       syms_of_textprop ();
 554 #ifdef VMS
 555       syms_of_vmsproc ();
 556 #endif /* VMS */
 557       syms_of_window ();
 558       syms_of_xdisp ();
 559 #ifdef HAVE_X_WINDOWS
 560       syms_of_xterm ();
 561       syms_of_xfns ();
 562       syms_of_xfaces ();
 563 #ifdef HAVE_X11
 564       syms_of_xselect ();
 565 #endif
 566 #ifdef HAVE_X_MENU
 567       syms_of_xmenu ();
 568 #endif /* HAVE_X_MENU */
 569 #endif /* HAVE_X_WINDOWS */
 570
 571 #ifdef SYMS_SYSTEM
 572       SYMS_SYSTEM;
 573 #endif
 574
 575 #ifdef SYMS_MACHINE
 576       SYMS_MACHINE;
 577 #endif
 578
 579       keys_of_casefiddle ();
 580       keys_of_cmds ();
 581       keys_of_buffer ();
 582       keys_of_keyboard ();
 583       keys_of_keymap ();
 584       keys_of_macros ();
 585       keys_of_minibuf ();
 586       keys_of_window ();
 587       keys_of_frame ();
 588     }
 589
 590   if (!initialized)
 591     {
 592       /* Handle -l loadup-and-dump, args passed by Makefile. */
 593       if (argc > 2 + skip_args && !strcmp (argv[1 + skip_args], "-l"))
 594         Vtop_level = Fcons (intern ("load"),
 595                             Fcons (build_string (argv[2 + skip_args]), Qnil));
 596 #ifdef CANNOT_DUMP
 597       /* Unless next switch is -nl, load "loadup.el" first thing.  */
 598       if (!(argc > 1 + skip_args && !strcmp (argv[1 + skip_args], "-nl")))
 599         Vtop_level = Fcons (intern ("load"),
 600                             Fcons (build_string ("loadup.el"), Qnil));
 601 #endif /* CANNOT_DUMP */
 602     }
 603
 604   initialized = 1;
 605
 606 #ifdef sun
 607   /* sun's localtime() has a bug.  it caches the value of the time
 608      zone rather than looking it up every time.  Since localtime() is
 609      called to bolt the undumping time into the undumped emacs, this
 610      results in localtime() ignoring the TZ environment variable.
 611      This flushes the new TZ value into localtime(). */
 612   tzset();
 613 #endif /* sun */
 614
 615   /* Enter editor command loop.  This never returns.  */
 616   Frecursive_edit ();
 617   /* NOTREACHED */
 618 }
 619 \f
 620 DEFUN ("kill-emacs", Fkill_emacs, Skill_emacs, 0, 1, "P",
 621   "Exit the Emacs job and kill it.\n\
 622 If ARG is an integer, return ARG as the exit program code.\n\
 623 If ARG is a  string, stuff it as keyboard input.\n\n\
 624 The value of `kill-emacs-hook', if not void,\n\
 625 is a list of functions (of no args),\n\
 626 all of which are called before Emacs is actually killed.")
 627   (arg)
 628      Lisp_Object arg;
 629 {
 630   Lisp_Object hook, hook1;
 631   int i;
 632   struct gcpro gcpro1;
 633
 634   GCPRO1 (arg);
 635
 636   if (feof (stdin))
 637     arg = Qt;
 638
 639   if (!NILP (Vrun_hooks) && !noninteractive)
 640     call1 (Vrun_hooks, intern ("kill-emacs-hook"));
 641
 642   UNGCPRO;
 643
 644 /* Is it really necessary to do this deassign
 645    when we are going to exit anyway?  */
 646 /* #ifdef VMS
 647   stop_vms_input ();
 648  #endif  */
 649
 650   shut_down_emacs (0, 0, STRINGP (arg) ? arg : Qnil);
 651
 652   exit ((XTYPE (arg) == Lisp_Int) ? XINT (arg)
 653 #ifdef VMS
 654         : 1
 655 #else
 656         : 0
 657 #endif
 658         );
 659   /* NOTREACHED */
 660 }
 661
 662
 663 /* Perform an orderly shutdown of Emacs.  Autosave any modified
 664    buffers, kill any child processes, clean up the terminal modes (if
 665    we're in the foreground), and other stuff like that.  Don't perform
 666    any redisplay; this may be called when Emacs is shutting down in
 667    the background, or after its X connection has died.
 668
 669    If SIG is a signal number, print a message for it.
 670
 671    This is called by fatal signal handlers, X protocol error handlers,
 672    and Fkill_emacs.  */
 673
 674 void
 675 shut_down_emacs (sig, no_x, stuff)
 676      int sig, no_x;
 677      Lisp_Object stuff;
 678 {
 679   /* If we are controlling the terminal, reset terminal modes */
 680 #ifdef EMACS_HAVE_TTY_PGRP
 681   {
 682 #ifdef USG
 683     int pgrp = getpgrp ();
 684 #else
 685     int pgrp = getpgrp (0);
 686 #endif
 687     int tpgrp;
 688     if (EMACS_GET_TTY_PGRP (0, &tpgrp) != -1
 689         && tpgrp == pgrp)
 690       {
 691         fflush (stdout);
 692         reset_sys_modes ();
 693         if (sig && sig != SIGTERM)
 694           fprintf (stderr, "Fatal error (%d).", sig);
 695       }
 696   }
 697 #else
 698   fflush (stdout);
 699   reset_sys_modes ();
 700 #endif
 701
 702   stuff_buffered_input (stuff);
 703
 704   kill_buffer_processes (Qnil);
 705   Fdo_auto_save (Qt, Qnil);
 706
 707 #ifdef CLASH_DETECTION
 708   unlock_all_files ();
 709 #endif
 710
 711 #ifdef VMS
 712   kill_vms_processes ();
 713 #endif
 714
 715 #ifdef HAVE_X_WINDOWS
 716   if (!noninteractive && EQ (Vwindow_system, intern ("x")) && ! no_x)
 717     Fx_close_current_connection ();
 718 #endif /* HAVE_X_WINDOWS */
 719
 720 #ifdef SIGIO
 721   /* There is a tendency for a SIGIO signal to arrive within exit,
 722      and cause a SIGHUP because the input descriptor is already closed.  */
 723   unrequest_sigio ();
 724   signal (SIGIO, SIG_IGN);
 725 #endif
 726 }
 727
 728
 729 \f
 730 #ifndef CANNOT_DUMP
 731 /* Nothing like this can be implemented on an Apollo.
 732    What a loss!  */
 733
 734 #ifdef HAVE_SHM
 735
 736 DEFUN ("dump-emacs-data", Fdump_emacs_data, Sdump_emacs_data, 1, 1, 0,
 737   "Dump current state of Emacs into data file FILENAME.\n\
 738 This function exists on systems that use HAVE_SHM.")
 739   (intoname)
 740      Lisp_Object intoname;
 741 {
 742   extern int my_edata;
 743   Lisp_Object tem;
 744   extern void malloc_warning ();
 745
 746   CHECK_STRING (intoname, 0);
 747   intoname = Fexpand_file_name (intoname, Qnil);
 748
 749   tem = Vpurify_flag;
 750   Vpurify_flag = Qnil;
 751
 752   fflush (stdout);
 753   /* Tell malloc where start of impure now is */
 754   /* Also arrange for warnings when nearly out of space.  */
 755 #ifndef SYSTEM_MALLOC
 756   memory_warnings (&my_edata, malloc_warning);
 757 #endif
 758   map_out_data (XSTRING (intoname)->data);
 759
 760   Vpurify_flag = tem;
 761
 762   return Qnil;
 763 }
 764
 765 #else /* not HAVE_SHM */
 766
 767 DEFUN ("dump-emacs", Fdump_emacs, Sdump_emacs, 2, 2, 0,
 768   "Dump current state of Emacs into executable file FILENAME.\n\
 769 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
 770 This is used in the file `loadup.el' when building Emacs.\n\
 771 \n\
 772 Bind `command-line-processed' to nil before dumping,\n\
 773 if you want the dumped Emacs to process its command line\n\
 774 and announce itself normally when it is run.")
 775   (intoname, symname)
 776      Lisp_Object intoname, symname;
 777 {
 778   extern int my_edata;
 779   Lisp_Object tem;
 780   extern void malloc_warning ();
 781
 782   CHECK_STRING (intoname, 0);
 783   intoname = Fexpand_file_name (intoname, Qnil);
 784   if (!NILP (symname))
 785     {
 786       CHECK_STRING (symname, 0);
 787       if (XSTRING (symname)->size)
 788         symname = Fexpand_file_name (symname, Qnil);
 789     }
 790
 791   tem = Vpurify_flag;
 792   Vpurify_flag = Qnil;
 793
 794   fflush (stdout);
 795 #ifdef VMS
 796   mapout_data (XSTRING (intoname)->data);
 797 #else
 798   /* Tell malloc where start of impure now is */
 799   /* Also arrange for warnings when nearly out of space.  */
 800 #ifndef SYSTEM_MALLOC
 801   memory_warnings (&my_edata, malloc_warning);
 802 #endif
 803   unexec (XSTRING (intoname)->data,
 804           !NILP (symname) ? XSTRING (symname)->data : 0, &my_edata, 0, 0);
 805 #endif /* not VMS */
 806
 807   Vpurify_flag = tem;
 808
 809   return Qnil;
 810 }
 811
 812 #endif /* not HAVE_SHM */
 813
 814 #endif /* not CANNOT_DUMP */
 815 \f
 816 #ifndef SEPCHAR
 817 #define SEPCHAR ':'
 818 #endif
 819
 820 Lisp_Object
 821 decode_env_path (evarname, defalt)
 822      char *evarname, *defalt;
 823 {
 824   register char *path, *p;
 825   extern char *index ();
 826
 827   Lisp_Object lpath;
 828
 829   /* It's okay to use getenv here, because this function is only used
 830      to initialize variables when Emacs starts up, and isn't called
 831      after that.  */
 832   if (evarname != 0)
 833     path = (char *) getenv (evarname);
 834   else
 835     path = 0;
 836   if (!path)
 837     path = defalt;
 838   lpath = Qnil;
 839   while (1)
 840     {
 841       p = index (path, SEPCHAR);
 842       if (!p) p = path + strlen (path);
 843       lpath = Fcons (p - path ? make_string (path, p - path) : Qnil,
 844                      lpath);
 845       if (*p)
 846         path = p + 1;
 847       else
 848         break;
 849     }
 850   return Fnreverse (lpath);
 851 }
 852
 853 syms_of_emacs ()
 854 {
 855 #ifndef CANNOT_DUMP
 856 #ifdef HAVE_SHM
 857   defsubr (&Sdump_emacs_data);
 858 #else
 859   defsubr (&Sdump_emacs);
 860 #endif
 861 #endif
 862
 863   defsubr (&Skill_emacs);
 864
 865   defsubr (&Sinvocation_name);
 866
 867   DEFVAR_LISP ("command-line-args", &Vcommand_line_args,
 868     "Args passed by shell to Emacs, as a list of strings.");
 869
 870   DEFVAR_LISP ("system-type", &Vsystem_type,
 871     "Value is symbol indicating type of operating system you are using.");
 872   Vsystem_type = intern (SYSTEM_TYPE);
 873
 874   DEFVAR_BOOL ("noninteractive", &noninteractive1,
 875     "Non-nil means Emacs is running without interactive terminal.");
 876
 877   DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook,
 878     "Hook to be run whenever kill-emacs is called.\n\
 879 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
 880 in other similar situations), functions placed on this hook should not\n\
 881 expect to be able to interact with the user.");
 882   Vkill_emacs_hook = Qnil;
 883
 884   DEFVAR_INT ("emacs-priority", &emacs_priority,
 885     "Priority for Emacs to run at.\n\
 886 This value is effective only if set before Emacs is dumped,\n\
 887 and only if the Emacs executable is installed with setuid to permit\n\
 888 it to change priority.  (Emacs sets its uid back to the real uid.)");
 889   emacs_priority = 0;
 890
 891   staticpro (&Vinvocation_name);
 892   Vinvocation_name = Qnil;
 893 }