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

int main ()
{
    pid_t pid;
    printf("Moj PID : %d\n",getpid());
    switch(pid = fork()){
    case -1:
        printf("fork error\n");
    case 0:
        printf("%d\n", getpid());
        printf("%d\n", getppid());
        printf("%d\n", pid);
        return 0;
    default:
    wait(0);
    printf("zakonczono proces potomny:");
        printf("%d\n", getpid());
        printf("%d\n", getppid());
        printf("%d\n", pid);
    }
}