#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/mman.h>

static void sighandler(int sig, siginfo_t *si, void *uc)
{
	printf("faulting address: 0x%lx\n", (unsigned long)si->si_addr);

	exit(1);
}

int main()
{
	char *page = mmap(0, 8192, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	mprotect(page, 4096, PROT_READ | PROT_WRITE);

	struct sigaction sa;

	sa.sa_sigaction = (void *)sighandler;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO| SA_NODEFER;
	sigaction(SIGSEGV, &sa, NULL);

	void *access_addr = page + 4095;

	printf("Mapped page = %p; will access %p\n", page, access_addr);

	gettimeofday(access_addr, NULL);

	return 0;
}