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#include <signal.h>
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#include <errno.h>
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int sigdelset(sigset_t *set, int sig)
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{
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unsigned s = sig-1;
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if (s >= _NSIG-1 || sig-32U < 3) {
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errno = EINVAL;
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return -1;
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}
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set->__bits[s/8/sizeof *set->__bits] &=~(1UL<<(s&8*sizeof *set->__bits-1));
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return 0;
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}
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