src/signal/sigismember.c

   1 #include <signal.h>
   2
   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 }