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

int main() {
    int ecrit;
    int lu;
    int p[2];

    pipe(p);
    pid_t pf = fork();

    if (pf == 0) {
        pid_t pf1 = fork();
        if (pf1 == 0) {
            while (read(p[0],&lu,sizeof(int)) > 0){
                printf("%d received %d\n", getpid(), lu);
            }
        }
    }
    else{
        pid_t pf2 = fork();
        if (pf2 == 0) {
        }
        else{
            while(1){
                sleep(3);
                ecrit = getpid();
                printf("%d sent %d\n", ecrit, ecrit);
                write(p[1],&ecrit,sizeof(int));
            }
        }
    }
}