#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static int ec = 0;

void action(int sig, siginfo_t *info, void *junk)
{
	ec = (((size_t)info == SI_USER) ? 1 : 0);
}

int main(void)
{
	struct sigaction sa;

	sa.sa_handler = NULL;
	sa.sa_sigaction = action;
	sa.sa_flags = SA_SIGINFO | SA_RESETHAND;
	sigemptyset(&sa.sa_mask);
	sigaddset(&sa.sa_mask, SIGINT);
	sigaction(SIGINT, &sa, NULL);

	kill(getpid(), SIGINT);
	return ec;
}