#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <signal.h>

#define PAGE_SIZE (4096)
#define MEGA	(1024 * 1024)

void sigalarm_handler(int sig)
{
}

int main(int argc, char *argv[])
{
	char *x;
	int off;

	signal(SIGALRM, sigalarm_handler);
	pause();
	while (1) {
		x = mmap(NULL, MEGA, PROT_READ|PROT_WRITE,
			MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);

		for (off = 0; off < MEGA; off += PAGE_SIZE)
			x[off]=0;
		munmap(x, MEGA);
	}
}