1#define _GNU_SOURCE
2#include <signal.h>
3#include <string.h>
4
5int sigisemptyset(const sigset_t* set) {
6    static const unsigned long zeroset[_NSIG / 8 / sizeof(long)];
7    return !memcmp(set, &zeroset, _NSIG / 8);
8}
9