#define _GNU_SOURCE
#include <signal.h>

#define SST_SIZE (_NSIG / 8 / sizeof(long))

int sigandset(sigset_t* dest, const sigset_t* left, const sigset_t* right) {
  unsigned long i = 0, *d = (void*)dest, *l = (void*)left, *r = (void*)right;
  for (; i < SST_SIZE; i++)
    d[i] = l[i] & r[i];
  return 0;
}