/*
 * This test program works on 32-bit Cygwin, but fails on 64-bit systems.
 * Running a signal handler for SIGFPE on the created POSIX thread does
 * not work.
 *
 * Compile with
 *
 * 	gcc -Wall -O0 -pthread -osyncsig_mt ./syncsig_mt.c
 *
 * Run with
 *
 * 	./syncsig_mt
 *
 * Expected Result
 *
 * 	Program prints "signal handler running"
 *
 * Actual Result
 *
 * 	No output on 64-bit systems, signal handler does not run
 * */

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

static void
signal_handler(int signum, siginfo_t* info, void* ucontext)
{
	fprintf(stderr, "signal handler running\n"); // unsafe in real code!
}

static void*
thread_start(void* arg)
{
	int argc = *(int*)arg;

	/* Trigger Windows Exception for division by zero */
	argc /= !argc;

	fprintf(stderr, "no exception generated\n");

	return NULL;
}

int
main(int argc, char* argv[])
{
	struct sigaction act = {
		.sa_sigaction = signal_handler,
		.sa_flags = SA_SIGINFO,
	};
	sigemptyset(&act.sa_mask);

	sigaction(SIGFPE, &act, NULL);

	pthread_t thread;
	pthread_create(&thread, NULL, thread_start, &argc);
	pthread_join(thread, NULL);

	return EXIT_SUCCESS;
}