setjmp/longjmp.c

   1 /* Copyright (C) 1991-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <setjmpP.h>
  20 #include <signal.h>
  21
  22
  23 /* Set the signal mask to the one specified in ENV, and jump
  24    to the position specified in ENV, causing the setjmp
  25    call there to return VAL, or 1 if VAL is 0.  */
  26 void
  27 __libc_siglongjmp (sigjmp_buf env, int val)
  28 {
  29   /* Perform any cleanups needed by the frames being unwound.  */
  30   _longjmp_unwind (env, val);
  31
  32   if (env[0].__mask_was_saved)
  33     /* Restore the saved signal mask.  */
  34     (void) __sigprocmask (SIG_SETMASK,
  35                           (sigset_t *) &env[0].__saved_mask,
  36                           (sigset_t *) NULL);
  37
  38   /* Call the machine-dependent function to restore machine state.  */
  39   __longjmp (env[0].__jmpbuf, val ?: 1);
  40 }
  41
  42 #ifndef __libc_siglongjmp
  43 strong_alias (__libc_siglongjmp, __libc_longjmp)
  44 libc_hidden_def (__libc_longjmp)
  45 weak_alias (__libc_siglongjmp, _longjmp)
  46 weak_alias (__libc_siglongjmp, longjmp)
  47 weak_alias (__libc_siglongjmp, siglongjmp)
  48 #endif