05/musl-0.6.0/src/signal/sigdelset.c


1
2
3
4
5
6
7
8
9
10
11
12
13

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

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