1#include <signal.h>
2#include <errno.h>
3
4int 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}