Initial revision

src/emacs.c

+/* Fully extensible Emacs, running on Unix, intended for GNU.
+   Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+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
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <signal.h>
+#include <errno.h>
+
+#include "config.h"
+#include <stdio.h>
+
+#include <sys/types.h>
+#include <sys/file.h>
+
+#ifdef VMS
+#include <ssdef.h>
+#endif
+
+#ifdef USG5
+#include <fcntl.h>
+#endif
+
+#ifdef BSD
+#include <sys/ioctl.h>
+#endif
+
+#ifdef APOLLO
+#ifndef APOLLO_SR10
+#include <default_acl.h>
+#endif
+#endif
+
+#undef NULL
+#include "lisp.h"
+#include "commands.h"
+
+#ifndef O_RDWR
+#define O_RDWR 2
+#endif
+
+#define PRIO_PROCESS 0
+
+/* Command line args from shell, as list of strings */
+Lisp_Object Vcommand_line_args;
+
+/* Set nonzero after Emacs has started up the first time.
+  Prevents reinitialization of the Lisp world and keymaps
+  on subsequent starts.  */
+int initialized;
+
+/* Variable whose value is symbol giving operating system type */
+Lisp_Object Vsystem_type;
+  
+/* If non-zero, emacs should not attempt to use an window-specific code,
+   but instead should use the virtual terminal under which it was started */
+int inhibit_window_system;
+
+#ifdef HAVE_X_WINDOWS
+/* If non-zero, -d was specified, meaning we're using some window system. */
+int display_arg;
+#endif
+
+/* An address near the bottom of the stack.
+   Tells GC how to save a copy of the stack.  */
+char *stack_bottom;
+
+#ifdef HAVE_X_WINDOWS
+extern Lisp_Object Vwindow_system;
+#endif /* HAVE_X_WINDOWS */
+
+#ifdef USG_SHARED_LIBRARIES
+/* If nonzero, this is the place to put the end of the writable segment
+   at startup.  */
+
+unsigned int bss_end = 0;
+#endif
+
+/* Nonzero means running Emacs without interactive terminal.  */
+
+int noninteractive;
+
+/* Value of Lisp variable `noninteractive'.
+   Normally same as C variable `noninteractive'
+   but nothing terrible happens if user sets this one.  */
+
+int noninteractive1;
+
+/* Signal code for the fatal signal that was received */
+int fatal_error_code;
+
+/* Nonzero if handling a fatal error already */
+int fatal_error_in_progress;
+
+/* Handle bus errors, illegal instruction, etc. */
+fatal_error_signal (sig)
+     int sig;
+{
+#ifdef BSD
+  int tpgrp;
+#endif /* BSD */
+
+  fatal_error_code = sig;
+  signal (sig, SIG_DFL);
+
+  /* If fatal error occurs in code below, avoid infinite recursion.  */
+  if (fatal_error_in_progress)
+    kill (getpid (), fatal_error_code);
+
+  fatal_error_in_progress = 1;
+
+  /* If we are controlling the terminal, reset terminal modes */
+#ifdef BSD
+  if (ioctl(0, TIOCGPGRP, &tpgrp) == 0
+      && tpgrp == getpgrp (0))
+#endif /* BSD */
+    {
+      reset_sys_modes ();
+      if (sig != SIGTERM)
+	fprintf (stderr, "Fatal error (%d).", sig);
+    }
+
+  /* Clean up */
+#ifdef subprocesses
+  kill_buffer_processes (Qnil);
+#endif
+  Fdo_auto_save (Qt, Qnil);
+
+#ifdef CLASH_DETECTION
+  unlock_all_files ();
+#endif /* CLASH_DETECTION */
+
+#ifdef VMS
+  kill_vms_processes ();
+  LIB$STOP (SS$_ABORT);
+#else
+  /* Signal the same code; this time it will really be fatal.  */
+  kill (getpid (), fatal_error_code);
+#endif /* not VMS */
+}
+
+/* Code for dealing with Lisp access to the Unix command line */
+
+static
+init_cmdargs (argc, argv, skip_args)
+     int argc;
+     char **argv;
+     int skip_args;
+{
+  register int i;
+
+  Vcommand_line_args = Qnil;
+
+  for (i = argc - 1; i >= 0; i--)
+    {
+      if (i == 0 || i > skip_args)
+	Vcommand_line_args
+	  = Fcons (build_string (argv[i]), Vcommand_line_args);
+    }
+}
+
+#ifdef VMS
+#ifdef LINK_CRTL_SHARE
+#ifdef SHAREABLE_LIB_BUG
+extern noshare char **environ;
+#endif /* SHAREABLE_LIB_BUG */
+#endif /* LINK_CRTL_SHARE */
+#endif /* VMS */
+
+/* ARGSUSED */
+main (argc, argv, envp)
+     int argc;
+     char **argv;
+     char **envp;
+{
+  char stack_bottom_variable;
+  int skip_args = 0;
+  extern int errno;
+  extern sys_nerr;
+  extern char *sys_errlist[];
+  extern void malloc_warning ();
+
+/* Map in shared memory, if we are using that.  */
+#ifdef HAVE_SHM
+  if (argc > 1 && !strcmp (argv[1], "-nl"))
+    {
+      map_in_data (0);
+      /* The shared memory was just restored, which clobbered this.  */
+      skip_args = 1;
+    }
+  else
+    {
+      map_in_data (1);
+      /* The shared memory was just restored, which clobbered this.  */
+      skip_args = 0;
+    }
+#endif
+
+#ifdef HAVE_X_WINDOWS
+  /* Stupid kludge to catch command-line display spec.  ask jla */
+  {
+    int i;
+
+    for (i = 1; (i < argc && ! display_arg); i++)
+      if (!strcmp (argv[i], "-d"))
+	display_arg = 1;
+  }
+#endif
+
+#ifdef VMS
+  /* If -map specified, map the data file in */
+  if (argc > 2 && ! strcmp (argv[1], "-map"))
+    {
+      skip_args = 2;
+      mapin_data (argv[2]);
+    }
+
+#ifdef LINK_CRTL_SHARE
+#ifdef SHAREABLE_LIB_BUG
+  /* Bletcherous shared libraries! */
+  if (!stdin)
+    stdin = fdopen (0, "r");
+  if (!stdout)
+    stdout = fdopen (1, "w");
+  if (!stderr)
+    stderr = fdopen (2, "w");
+  if (!environ)
+    environ = envp;
+#endif /* SHAREABLE_LIB_BUG */
+#endif /* LINK_CRTL_SHARE */
+#endif /* VMS */
+
+  /* Record (approximately) where the stack begins.  */
+  stack_bottom = &stack_bottom_variable;
+
+#ifdef RUN_TIME_REMAP
+  if (initialized)
+    run_time_remap (argv[0]);
+#endif
+
+#ifdef USG_SHARED_LIBRARIES
+  if (bss_end)
+    brk (bss_end);
+#endif
+
+  clearerr (stdin);
+#ifdef BSD
+  setpgrp (0, getpid ());
+#endif
+
+#ifdef APOLLO
+#ifndef APOLLO_SR10
+  /* If USE_DOMAIN_ACLS environment variable exists,
+     use ACLs rather than UNIX modes. */
+  if (egetenv ("USE_DOMAIN_ACLS"))
+    default_acl (USE_DEFACL);
+#endif
+#endif /* APOLLO */
+
+#ifndef SYSTEM_MALLOC
+  if (! initialized)
+    malloc_init (0, malloc_warning);
+#endif	/* not SYSTEM_MALLOC */
+
+#ifdef HIGHPRI
+  setpriority (PRIO_PROCESS, getpid (), HIGHPRI);
+  setuid (getuid ());
+#endif /* HIGHPRI */
+
+#ifdef BSD
+  /* interrupt_input has trouble if we aren't in a separate process group.  */
+  setpgrp (getpid (), getpid ());
+#endif
+
+  inhibit_window_system = 0;
+
+/* Handle the -t switch, which specifies filename to use as terminal */
+  if (skip_args + 2 < argc && !strcmp (argv[skip_args + 1], "-t"))
+    {
+      int result;
+      skip_args += 2;
+      close (0);
+      close (1);
+      result = open (argv[skip_args], O_RDWR, 2 );
+      if (result < 0)
+	{
+	  char *errstring;
+
+	  if (errno >= 0 && errno < sys_nerr)
+	    errstring = sys_errlist[errno];
+	  else
+	    errstring = "undocumented error code";
+	  fprintf (stderr, "emacs: %s: %s\n", argv[skip_args], errstring);
+	  exit (1);
+	}
+      dup (0);
+      if (! isatty (0))
+	{
+	  fprintf (stderr, "emacs: %s: not a tty\n", argv[skip_args]);
+	  exit (1);
+	}
+      fprintf (stderr, "Using %s\n", argv[skip_args]);
+#ifdef HAVE_X_WINDOWS
+      inhibit_window_system = 1;	/* -t => -nw */
+#endif
+    }
+
+  if (skip_args + 1 < argc
+      && (!strcmp (argv[skip_args + 1], "-nw")))
+    {
+      skip_args += 1;
+      inhibit_window_system = 1;
+    }
+
+/* Handle the -batch switch, which means don't do interactive display.  */
+  noninteractive = 0;
+  if (skip_args + 1 < argc && !strcmp (argv[skip_args + 1], "-batch"))
+    {
+      skip_args += 1;
+      noninteractive = 1;
+    }
+
+  if (
+#ifndef CANNOT_DUMP
+      ! noninteractive || initialized
+#else
+      1
+#endif
+      )
+    {
+      /* Don't catch these signals in batch mode if not initialized.
+	 On some machines, this sets static data that would make
+	 signal fail to work right when the dumped Emacs is run.  */
+      signal (SIGHUP, fatal_error_signal);
+      signal (SIGQUIT, fatal_error_signal);
+      signal (SIGILL, fatal_error_signal);
+      signal (SIGTRAP, fatal_error_signal);
+      signal (SIGIOT, fatal_error_signal);
+#ifdef SIGEMT
+      signal (SIGEMT, fatal_error_signal);
+#endif
+      signal (SIGFPE, fatal_error_signal);
+      signal (SIGBUS, fatal_error_signal);
+      signal (SIGSEGV, fatal_error_signal);
+      signal (SIGSYS, fatal_error_signal);
+      signal (SIGTERM, fatal_error_signal);
+#ifdef SIGXCPU
+      signal (SIGXCPU, fatal_error_signal);
+#endif
+#ifdef SIGXFSZ
+      signal (SIGXFSZ, fatal_error_signal);
+#endif /* SIGXFSZ */
+
+#ifdef AIX
+      signal (SIGDANGER, fatal_error_signal);
+      signal (20, fatal_error_signal);
+      signal (21, fatal_error_signal);
+      signal (22, fatal_error_signal);
+      signal (23, fatal_error_signal);
+      signal (24, fatal_error_signal);
+      signal (SIGAIO, fatal_error_signal);
+      signal (SIGPTY, fatal_error_signal);
+      signal (SIGIOINT, fatal_error_signal);
+      signal (SIGGRANT, fatal_error_signal);
+      signal (SIGRETRACT, fatal_error_signal);
+      signal (SIGSOUND, fatal_error_signal);
+      signal (SIGMSG, fatal_error_signal);
+#endif /* AIX */
+    }
+
+  noninteractive1 = noninteractive;
+
+/* Perform basic initializations (not merely interning symbols) */
+
+  if (!initialized)
+    {
+      init_alloc_once ();
+      init_obarray ();
+      init_eval_once ();
+      init_syntax_once ();	/* Create standard syntax table.  */
+		      /* Must be done before init_buffer */
+      init_casetab_once ();
+      init_buffer_once ();	/* Create buffer table and some buffers */
+      init_minibuf_once ();	/* Create list of minibuffers */
+			      /* Must precede init_window_once */
+      init_window_once ();	/* Init the window system */
+    }
+
+  init_alloc ();
+#ifdef MAINTAIN_ENVIRONMENT
+  init_environ ();
+#endif
+  init_eval ();
+  init_data ();
+  init_read ();
+
+  init_cmdargs (argc, argv, skip_args);	/* Create list Vcommand_line_args */
+  init_buffer ();	/* Init default directory of main buffer */
+  if (!noninteractive)
+    {
+#ifdef VMS
+      init_vms_input ();/* init_display calls get_screen_size, that needs this */
+#endif /* VMS */
+      init_display ();	/* Determine terminal type.  init_sys_modes uses results */
+    }
+  init_keyboard ();	/* This too must precede init_sys_modes */
+  init_callproc ();	/* And this too. */
+#ifdef VMS
+  init_vmsproc ();	/* And this too. */
+#endif /* VMS */
+  init_sys_modes ();	/* Init system terminal modes (RAW or CBREAK, etc.) */
+  init_xdisp ();
+  init_macros ();
+  init_editfns ();
+#ifdef LISP_FLOAT_TYPE
+  init_floatfns ();
+#endif
+#ifdef VMS
+  init_vmsfns ();
+#endif /* VMS */
+#ifdef subprocesses
+  init_process ();
+#endif /* subprocesses */
+
+/* Intern the names of all standard functions and variables; define standard keys */
+
+  if (!initialized)
+    {
+      /* The basic levels of Lisp must come first */
+      /* And data must come first of all
+	 for the sake of symbols like error-message */
+      syms_of_data ();
+      syms_of_alloc ();
+#ifdef MAINTAIN_ENVIRONMENT
+      syms_of_environ ();
+#endif /* MAINTAIN_ENVIRONMENT */
+      syms_of_read ();
+      syms_of_print ();
+      syms_of_eval ();
+      syms_of_fns ();
+#ifdef LISP_FLOAT_TYPE
+      syms_of_floatfns ();
+#endif
+
+      syms_of_abbrev ();
+      syms_of_buffer ();
+      syms_of_bytecode ();
+      syms_of_callint ();
+      syms_of_casefiddle ();
+      syms_of_casetab ();
+      syms_of_callproc ();
+      syms_of_cmds ();
+#ifndef NO_DIR_LIBRARY
+      syms_of_dired ();
+#endif /* not NO_DIR_LIBRARY */
+      syms_of_display ();
+      syms_of_doc ();
+      syms_of_editfns ();
+      syms_of_emacs ();
+      syms_of_fileio ();
+#ifdef CLASH_DETECTION
+      syms_of_filelock ();
+#endif /* CLASH_DETECTION */
+      syms_of_indent ();
+      syms_of_keyboard ();
+      syms_of_keymap ();
+      syms_of_macros ();
+      syms_of_marker ();
+      syms_of_minibuf ();
+      syms_of_mocklisp ();
+#ifdef subprocesses
+      syms_of_process ();
+#endif /* subprocesses */
+      syms_of_search ();
+#ifdef MULTI_SCREEN
+      syms_of_screen ();
+#endif
+      syms_of_syntax ();
+      syms_of_undo ();
+#ifdef VMS
+      syms_of_vmsproc ();
+#endif /* VMS */
+      syms_of_window ();
+      syms_of_xdisp ();
+#ifdef HAVE_X_WINDOWS
+      syms_of_xfns ();
+#ifdef HAVE_X_MENU
+      syms_of_xmenu ();
+#endif /* HAVE_X_MENU */
+#endif /* HAVE_X_WINDOWS */
+
+#ifdef SYMS_SYSTEM
+      SYMS_SYSTEM;
+#endif
+
+#ifdef SYMS_MACHINE
+      SYMS_MACHINE;
+#endif
+
+      keys_of_casefiddle ();
+      keys_of_cmds ();
+      keys_of_buffer ();
+      keys_of_keyboard ();
+      keys_of_keymap ();
+      keys_of_macros ();
+      keys_of_minibuf ();
+      keys_of_window ();
+    }
+
+  if (!initialized)
+    {
+      /* Handle -l loadup-and-dump, args passed by Makefile. */
+      if (argc > 2 + skip_args && !strcmp (argv[1 + skip_args], "-l"))
+	Vtop_level = Fcons (intern ("load"),
+			    Fcons (build_string (argv[2 + skip_args]), Qnil));
+#ifdef CANNOT_DUMP
+      /* Unless next switch is -nl, load "loadup.el" first thing.  */
+      if (!(argc > 1 + skip_args && !strcmp (argv[1 + skip_args], "-nl")))
+	Vtop_level = Fcons (intern ("load"),
+			    Fcons (build_string ("loadup.el"), Qnil));
+#endif /* CANNOT_DUMP */
+    }
+
+  initialized = 1;
+
+  /* Enter editor command loop.  This never returns.  */
+  Frecursive_edit ();
+  /* NOTREACHED */
+}
+
+DEFUN ("kill-emacs", Fkill_emacs, Skill_emacs, 0, 1, "P",
+  "Exit the Emacs job and kill it.  Ask for confirmation, without argument.\n\
+If ARG is an integer, return ARG as the exit program code.\n\
+If ARG is a  string, stuff it as keyboard input.\n\n\
+The value of `kill-emacs-hook', if not void,\n\
+is a list of functions (of no args),\n\
+all of which are called before Emacs is actually killed.")
+  (arg)
+     Lisp_Object arg;
+{
+  Lisp_Object hook, hook1;
+  int i;
+  struct gcpro gcpro1;
+
+  GCPRO1 (arg);
+
+  if (feof (stdin))
+    arg = Qt;
+
+  if (!NULL (Vrun_hooks) && !noninteractive)
+    call1 (Vrun_hooks, intern ("kill-emacs-hook"));
+
+#ifdef subprocesses
+  kill_buffer_processes (Qnil);
+#endif /* subprocesses */
+
+#ifdef VMS
+  kill_vms_processes ();
+#endif /* VMS */
+
+  Fdo_auto_save (Qt, Qnil);
+
+#ifdef CLASH_DETECTION
+  unlock_all_files ();
+#endif /* CLASH_DETECTION */
+
+  fflush (stdout);
+  reset_sys_modes ();
+
+#ifdef HAVE_X_WINDOWS
+  if (!noninteractive && EQ (Vwindow_system, intern ("x")))
+    Fx_close_current_connection ();
+#endif /* HAVE_X_WINDOWS */
+
+  UNGCPRO;
+
+/* Is it really necessary to do this deassign
+   when we are going to exit anyway?  */
+/* #ifdef VMS
+  stop_vms_input ();
+ #endif  */
+  stuff_buffered_input (arg);
+#ifdef SIGIO
+  /* There is a tendency for a SIGIO signal to arrive within exit,
+     and cause a SIGHUP because the input descriptor is already closed.  */
+  unrequest_sigio ();
+  signal (SIGIO, SIG_IGN);
+#endif
+  exit ((XTYPE (arg) == Lisp_Int) ? XINT (arg)
+#ifdef VMS
+	: 1
+#else
+	: 0
+#endif
+	);
+  /* NOTREACHED */
+}
+
+#ifndef CANNOT_DUMP
+/* Nothing like this can be implemented on an Apollo.
+   What a loss!  */
+
+#ifdef HAVE_SHM
+
+DEFUN ("dump-emacs-data", Fdump_emacs_data, Sdump_emacs_data, 1, 1, 0,
+  "Dump current state of Emacs into data file FILENAME.\n\
+This function exists on systems that use HAVE_SHM.")
+  (intoname)
+     Lisp_Object intoname;
+{
+  extern int my_edata;
+  Lisp_Object tem;
+  extern void malloc_warning ();
+
+  CHECK_STRING (intoname, 0);
+  intoname = Fexpand_file_name (intoname, Qnil);
+
+  tem = Vpurify_flag;
+  Vpurify_flag = Qnil;
+
+  fflush (stdout);
+  /* Tell malloc where start of impure now is */
+  /* Also arrange for warnings when nearly out of space.  */
+#ifndef SYSTEM_MALLOC
+  malloc_init (&my_edata, malloc_warning);
+#endif
+  map_out_data (XSTRING (intoname)->data);
+
+  Vpurify_flag = tem;
+
+  return Qnil;
+}
+
+#else /* not HAVE_SHM */
+
+DEFUN ("dump-emacs", Fdump_emacs, Sdump_emacs, 2, 2, 0,
+  "Dump current state of Emacs into executable file FILENAME.\n\
+Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
+This is used in the file `loadup.el' when building Emacs.\n\
+\n\
+Bind `command-line-processed' to nil before dumping,\n\
+if you want the dumped Emacs to process its command line\n\
+and announce itself normally when it is run.")
+  (intoname, symname)
+     Lisp_Object intoname, symname;
+{
+  extern int my_edata;
+  Lisp_Object tem;
+  extern void malloc_warning ();
+
+  CHECK_STRING (intoname, 0);
+  intoname = Fexpand_file_name (intoname, Qnil);
+  if (!NULL (symname))
+    {
+      CHECK_STRING (symname, 0);
+      if (XSTRING (symname)->size)
+	symname = Fexpand_file_name (symname, Qnil);
+    }
+
+  tem = Vpurify_flag;
+  Vpurify_flag = Qnil;
+