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

main(int argc, char **argv)
{
    char *c;
	int mb;

	if (argv[1]==NULL)
	{
		fprintf(stderr,"Use: %s number-of-MB\n",argv[0]);
		exit(1);
	}

	mb=atoi(argv[1])*1024*1024;

    if (NULL==(c=malloc((size_t)mb)))
    {
		perror("malloc");
        printf("FAIL for %d B (%f GB)\n",mb, (float)atoi(argv[1])/1024.0);
        exit(1);
    }
    else
	{
        printf("success for %d B (%f GB)\n",mb, (float)atoi(argv[1])/1024.0);
        printf("setting %d B\n",mb);
    	memset(c,23,(size_t)mb);
        printf("sleeping for 30 seconds\n");
    	sleep(30);
		free(c);
	}
}