#include <signal.h>
#include <stdio.h>
#include <unistd.h>
struct sigaction mysigs;

int main()
{
  sigemptyset(&mysigs.sa_mask);
  sigaddset(&mysigs.sa_mask, 34);
  if (sigismember(&mysigs.sa_mask, 2)) {
    printf("2 is a member\n");
  }
  if (sigismember(&mysigs.sa_mask, 34)) {
    printf("34 is a member\n");
  }
  if (sigismember(&mysigs.sa_mask, 47)) {
    printf("46 is a member\n");
  } else {
    printf("47 is not a member\n");
  }
}