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

static void raise_usr2(int signo) {
	raise(SIGUSR2);
}

static void register_handler(int signo) {
	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_ONSTACK;
	sa.sa_handler = raise_usr2;

	if (sigaction(SIGUSR1, &sa, NULL) != 0) {
		perror("failed to register SIGUSR1 handler");