glibc/sysdeps/generic/sigjmp.c

/* Copyright (C) 1992, 1994, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stddef.h>
#include <setjmp.h>
#include <signal.h>

/* This function is called by the `sigsetjmp' macro
   before doing a `__setjmp' on ENV[0].__jmpbuf.
   Always return zero.  */

int
__sigjmp_save (sigjmp_buf env, int savemask)
{
  env[0].__mask_was_saved = (savemask &&
			     __sigprocmask (SIG_BLOCK, (sigset_t *) NULL,
					    &env[0].__saved_mask) == 0);

  return 0;
}