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1 #include <signal.h>
2 #include <errno.h>
3 
sigdelset(sigset_t * set,int sig)4 int sigdelset(sigset_t *set, int sig)
5 {
6 	unsigned s = sig-1;
7 	if (s >= _NSIG-1 || sig-32U < 3) {
8 		errno = EINVAL;
9 		return -1;
10 	}
11 	set->__bits[s/8/sizeof *set->__bits] &=~(1UL<<(s&8*sizeof *set->__bits-1));
12 	return 0;
13 }
14