1 #include <signal.h> 2 sigismember(const sigset_t * set,int sig)3 int sigismember(const sigset_t *set, int sig) 4 { 5 unsigned s = sig-1; 6 if (s >= _NSIG-1) return 0; 7 return !!(set->__bits[s/8/sizeof *set->__bits] & 1UL<<(s&8*sizeof *set->__bits-1)); 8 } 9