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#include <signal.h>
#include <errno.h>

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