1#define _GNU_SOURCE
 2#include <signal.h>
 3#include <string.h>
 4
 5int sigisemptyset(const sigset_t *set)
 6{
 7	for (size_t i=0; i<_NSIG/8/sizeof *set->__bits; i++)
 8		if (set->__bits[i]) return 0;
 9	return 1;
10}