#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <inttypes.h>

int main(int argc, char *argv[])
{
	char *junk;
	uint64_t mem;
	uint64_t i;
	uint64_t count;
	long pagesize;
	long pages;

	if (argc != 1) {
		fprintf(stderr, "Usage: memeater\n");
		return 1;
	}

	pagesize = sysconf(_SC_PAGESIZE);
	pages = sysconf(_SC_PHYS_PAGES);
	// Allocate all memory in the machine except for 150MB
	mem = (uint64_t)(pagesize) * (uint64_t)(pages) - (150 * 1024 * 1024);

	fprintf(stdout, "Going to malloc %llu bytes\n",mem);

	junk = malloc(mem);
	if (junk == NULL) {
		fprintf(stderr, "Failed to malloc %llu bytes: %s\n",mem,strerror(errno));
		return 2;
	}

	fprintf(stdout, "Going to touch %llu bytes continuously; Ctrl-C to quit\n",mem);

	count = 0;
	while (1) {
		for (i = 0; i < mem ; i++)
			*(junk + i) = count;
		count++;
	}

	free(junk);
	return 0;
}