libc/signal/sigjmp.c

   1 /* Copyright (C) 1992, 1994, 1997 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 #define __need_NULL
  19 #include <stddef.h>
  20 #include <setjmp.h>
  21 #include <signal.h>
  22
  23 /* This function is called by the `sigsetjmp' macro
  24    before doing a `__setjmp' on ENV[0].__jmpbuf.
  25    Always return zero.  */
  26
  27 int __sigjmp_save (sigjmp_buf env, int savemask)
  28 {
  29     env[0].__mask_was_saved = (savemask &&
  30             sigprocmask (SIG_BLOCK, NULL, &env[0].__saved_mask) == 0);
  31
  32     return 0;
  33 }