memtorture.c

#include <errno.h>
#include <string.h>
#include <sys/mman.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
	size_t len;
	void *p;
	int ret;

	if (argc != 2) {
		printf("Usage: %s [size in bytes]\n", argv[0]);
		return 0;
	}


	len = (size_t) strtoull(argv[1], NULL, 10);

	printf("mmap'ing %zu bytes...\n", len);
	p   = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
		   -1, 0);
	if (p == MAP_FAILED) {
		ret = errno;
		perror("mmap");
		return ret;
	}

	printf("Locking...\n");
	ret = mlock(p, len);
	if (ret < 0) {
		ret = errno;
		perror("mlock");
		goto out;
	}

	printf("Faulting...\n");
	memset(p, 'x', len);

	printf("Sleeping for 10 seconds...\n");
	sleep(10);

	printf("Unlocking...\n");
	munlock(p, len);
out:
	printf("munmap'ing...\n");
	munmap(p, len);
	return ret;
}