builtins/return.def

   1 This file is return.def, from which is created return.c.
   2 It implements the builtin "return" 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 return.c
  23
  24 $BUILTIN return
  25
  26 $FUNCTION return_builtin
  27 $SHORT_DOC return [n]
  28 Causes a function to exit with the return value specified by N.  If N
  29 is omitted, the return status is that of the last command.
  30 $END
  31
  32 #include <config.h>
  33
  34 #if defined (HAVE_UNISTD_H)
  35 #  ifdef _MINIX
  36 #    include <sys/types.h>
  37 #  endif
  38 #  include <unistd.h>
  39 #endif
  40
  41 #include "../shell.h"
  42 #include "common.h"
  43
  44 extern int last_command_exit_value;
  45 extern int return_catch_flag, return_catch_value;
  46
  47 /* If we are executing a user-defined function then exit with the value
  48    specified as an argument.  if no argument is given, then the last
  49    exit status is used. */
  50 int
  51 return_builtin (list)
  52      WORD_LIST *list;
  53 {
  54   return_catch_value = list ? get_numeric_arg (list, 1) : last_command_exit_value;
  55
  56   if (return_catch_flag)
  57     longjmp (return_catch, 1);
  58   else
  59     {
  60       builtin_error ("can only `return' from a function or sourced script");
  61       return (EXECUTION_FAILURE);
  62     }
  63 }