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40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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sigdelset.cpp
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Remove a signal from a signal set.
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*******************************************************************************/
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#include <errno.h>
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#include <signal.h>
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#include <stdint.h>
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extern "C" int sigdelset(sigset_t* set, int signum)
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{
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int max_signals = sizeof(set->__val) * 8;
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if ( max_signals <= signum )
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return errno = EINVAL, -1;
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size_t which_byte = signum / 8;
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size_t which_bit = signum % 8;
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uint8_t* bytes = (uint8_t*) set->__val;
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bytes[which_byte] &= ~(1 << which_bit);
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return 0;
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}
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