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} 14