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sortix--sortix/libc/signal/sigdelset.cpp

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2013-01-08 09:10:24 -05:00
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
signal/sigdelset.cpp
2013-01-08 09:10:24 -05:00
Remove a signal from a signal set.
*******************************************************************************/
#include <errno.h>
#include <signal.h>
#include <stdint.h>
extern "C" int sigdelset(sigset_t* set, int signum)
{
int max_signals = sizeof(set->__val) * 8;
if ( max_signals <= signum )
return errno = EINVAL, -1;
size_t which_byte = signum / 8;
size_t which_bit = signum % 8;
uint8_t* bytes = (uint8_t*) set->__val;
bytes[which_byte] &= ~(1 << which_bit);
return 0;
}