34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* signal/sigismember.c
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* Test signal membership in 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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int sigismember(const 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 ( signum < 0 || 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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const uint8_t* bytes = (const uint8_t*) set->__val;
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return bytes[which_byte] & (1 << which_bit) ? 1 : 0;
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}
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