builtins/exit.def

   1 This file is exit.def, from which is created exit.c.
   2 It implements the builtins "exit", and "logout" in Bash.
   3
   4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
   5
   6 This file is part of GNU Bash, the Bourne Again SHell.
   7
   8 Bash is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 1, or (at your option) any later
  11 version.
  12
  13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License along
  19 with Bash; see the file COPYING.  If not, write to the Free Software
  20 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 $PRODUCES exit.c
  23
  24 $BUILTIN exit
  25 $FUNCTION exit_builtin
  26 $SHORT_DOC exit [n]
  27 Exit the shell with a status of N.  If N is omitted, the exit status
  28 is that of the last command executed.
  29 $END
  30
  31 #include <config.h>
  32
  33 #include "../bashtypes.h"
  34 #include <stdio.h>
  35
  36 #if defined (HAVE_UNISTD_H)
  37 #  include <unistd.h>
  38 #endif
  39
  40 #include "../shell.h"
  41 #include "../jobs.h"
  42
  43 #include "common.h"
  44 #include "builtext.h"   /* for jobs_builtin */
  45
  46 extern int interactive, login_shell;
  47 extern int last_command_exit_value;
  48 extern Function *this_shell_builtin;
  49 extern Function *last_shell_builtin;
  50
  51 static int exit_or_logout ();
  52 static int sourced_logout;
  53
  54 int
  55 exit_builtin (list)
  56      WORD_LIST *list;
  57 {
  58   if (interactive)
  59     {
  60       fprintf (stderr, login_shell ? "logout\n" : "exit\n");
  61       fflush (stderr);
  62     }
  63
  64   return (exit_or_logout (list));
  65 }
  66
  67 $BUILTIN logout
  68 $FUNCTION logout_builtin
  69 $SHORT_DOC logout
  70 Logout of a login shell.
  71 $END
  72
  73 /* How to logout. */
  74 int
  75 logout_builtin (list)
  76      WORD_LIST *list;
  77 {
  78   if (login_shell == 0 /* && interactive */)
  79     {
  80       builtin_error ("not login shell: use `exit'");
  81       return (EXECUTION_FAILURE);
  82     }
  83   else
  84     return (exit_or_logout (list));
  85 }
  86
  87 static int
  88 exit_or_logout (list)
  89      WORD_LIST *list;
  90 {
  91   int exit_value;
  92
  93 #if defined (JOB_CONTROL)
  94   int exit_immediate_okay;
  95
  96   exit_immediate_okay = (interactive  == 0 ||
  97                          last_shell_builtin == exit_builtin ||
  98                          last_shell_builtin == logout_builtin ||
  99                          last_shell_builtin == jobs_builtin);
 100
 101   /* Check for stopped jobs if the user wants to. */
 102   if (!exit_immediate_okay)
 103     {
 104       register int i;
 105       for (i = 0; i < job_slots; i++)
 106         if (jobs[i] && STOPPED (i))
 107           {
 108             fprintf (stderr, "There are stopped jobs.\n");
 109
 110             /* This is NOT superfluous because EOF can get here without
 111                going through the command parser.  Set both last and this
 112                so that either `exit', `logout', or ^D will work to exit
 113                immediately if nothing intervenes. */
 114             this_shell_builtin = last_shell_builtin = exit_builtin;
 115             return (EXECUTION_FAILURE);
 116           }
 117     }
 118 #endif /* JOB_CONTROL */
 119
 120   /* Get return value if present.  This means that you can type
 121      `logout 5' to a shell, and it returns 5. */
 122   exit_value = list ? get_numeric_arg (list, 1) : last_command_exit_value;
 123
 124   /* Run our `~/.bash_logout' file if it exists, and this is a login shell. */
 125   if (login_shell && sourced_logout++ == 0)
 126     {
 127       maybe_execute_file ("~/.bash_logout", 1);
 128 #ifdef SYS_BASH_LOGOUT
 129       maybe_execute_file (SYS_BASH_LOGOUT, 1);
 130 #endif
 131     }
 132
 133   last_command_exit_value = exit_value;
 134
 135   /* Exit the program. */
 136   jump_to_top_level (EXITPROG);
 137   /*NOTREACHED*/
 138 }