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

#define N 8*1024*1024 

char tab[N];

int main(void)
{
	for (int i = 0; i < N; i++)
		tab[i] = (char)i;

	printf("Avant fork : tab = %p\n", (void *)tab);

	pid_t pid = fork();

	if (pid < 0) {
		perror("fork");
		exit(EXIT_FAILURE);
	}

	if (pid == 0) {
		printf("Fils : tab = %p, tab[5000] = %d\n",
				(void *)(tab+5000), tab[5000]);
		printf("FILS PID = %d\n", getpid());
		getchar();

		tab[5000] = 42;
		printf("-> modification\n");
		getchar();

		printf("Fils après modification : tab[5000] = %d\n",
				tab[5000]);

		exit(EXIT_SUCCESS);
	}
	else {
		sleep(1);

		printf("Père : tab = %p, tab[5000] = %d\n",
				(void *)tab, tab[5000]);

		wait(NULL);
	}

	return 0;
}