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/* Copyright (C) 1991, 94, 95, 96, 97, 98, 2001 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#define __USE_GNU
#include <signal.h>
/* Block signals in MASK, returning the old mask. */
int sigblock (int mask)
{
register unsigned int sig;
sigset_t set, oset;
if (__sigemptyset (&set) < 0)
return -1;
if (sizeof (mask) == sizeof (set))
*(int *) &set = mask;
else if (sizeof (unsigned long int) == sizeof (set))
*(unsigned long int *) &set = (unsigned int) mask;
else
for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
if ((mask & sigmask (sig)) && __sigaddset (&set, sig) < 0)
return -1;
if (sigprocmask (SIG_BLOCK, &set, &oset) < 0)
return -1;
if (sizeof (mask) == sizeof (oset))
mask = *(int *) &oset;
else if (sizeof (unsigned long int) == sizeof (oset))
mask = *(unsigned long int*) &oset;
else
for (sig = 1, mask = 0; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
if (__sigismember (&oset, sig))
mask |= sigmask (sig);
return mask;
}
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