#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/wait.h>

#define NELEMS(x)  (sizeof(x) / sizeof((x)[0]))


static int size_max_in_100mb = 300; // Maximal 30GB
static int use_memory = 1;			// Bei 0 wird der Speicher nur reserviert aber nicht tatsächlich genutzt.

int main(void)
	{
	void *buffer[size_max_in_100mb];
	memset(buffer, 0, sizeof(buffer));
	size_t size = 100000000;
	int count;
	for(count=0;count<NELEMS(buffer);count++)
		{
		usleep(100000);
		if((buffer[count] = malloc(size)) != NULL)
			{
			printf("%dMB\n", (int)(size *(size_t)(count+1) / (size_t)1000000));
			if(use_memory)
				{
				memset(buffer[count], 0, size);
				}
			}
		else
			{
			puts("malloc meldet Fehler.");
			break;
			}
		}
	sleep(3);
	if(buffer[count] == NULL)
		{
		count--;
		}
	for(;count>=0;count--)
		{
		free(buffer[count]);
		}
	return 0;
	}