overcommit

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    void *p;
    intptr_t i;

    if (argc != 2) {
        fprintf(stderr, "usage: %s <gigabytes>\n", *argv);
        return 1;
    }

    i = atol(argv[1]);

    /* allocate X GB */
    p = sbrk(i * 1024 * 1024 * 1024);

    if ((intptr_t)p == -1) {
        perror("sbrk");
        return 1;
    }

    /* sleep forever */
    pause();

    return 0;
}