setjmp/longjmp.c

   1 /* Copyright (C) 1991,92,94,95,97,98,2000,2002,2009
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stddef.h>
  21 #include <setjmp.h>
  22 #include <signal.h>
  23
  24
  25 /* Set the signal mask to the one specified in ENV, and jump
  26    to the position specified in ENV, causing the setjmp
  27    call there to return VAL, or 1 if VAL is 0.  */
  28 void
  29 __libc_siglongjmp (sigjmp_buf env, int val)
  30 {
  31   /* Perform any cleanups needed by the frames being unwound.  */
  32   _longjmp_unwind (env, val);
  33
  34   if (env[0].__mask_was_saved)
  35     /* Restore the saved signal mask.  */
  36     (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
  37                           (sigset_t *) NULL);
  38
  39   /* Call the machine-dependent function to restore machine state.  */
  40   __longjmp (env[0].__jmpbuf, val ?: 1);
  41 }
  42
  43 #ifndef __libc_siglongjmp
  44 strong_alias (__libc_siglongjmp, __libc_longjmp)
  45 libc_hidden_def (__libc_longjmp)
  46 weak_alias (__libc_siglongjmp, _longjmp)
  47 weak_alias (__libc_siglongjmp, longjmp)
  48 weak_alias (__libc_siglongjmp, siglongjmp)
  49 #endif