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