setjmp/longjmp.c

   1 /* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stddef.h>
  20 #include <setjmp.h>
  21 #include <signal.h>
  22
  23
  24 extern void _longjmp_unwind (jmp_buf env, int val);
  25
  26 /* Set the signal mask to the one specified in ENV, and jump
  27    to the position specified in ENV, causing the setjmp
  28    call there to return VAL, or 1 if VAL is 0.  */
  29 void
  30 longjmp (sigjmp_buf env, int val)
  31 {
  32   /* Perform any cleanups needed by the frames being unwound.  */
  33   _longjmp_unwind (env, val);
  34
  35   if (env[0].__mask_was_saved)
  36     /* Restore the saved signal mask.  */
  37     (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
  38                           (sigset_t *) NULL);
  39
  40   /* Call the machine-dependent function to restore machine state.  */
  41   __longjmp (env[0].__jmpbuf, val ?: 1);
  42 }
  43
  44 weak_alias (longjmp, _longjmp)
  45 weak_alias (longjmp, siglongjmp)