ex08-03.c

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

int main() {
    pid_t pid1, pid2;
    int status;

    pid1 = pid2 = -1;
    pid1 = fork();
    if (pid1 > 0) pid2 = fork();
    if (pid1 > 0 && pid2 > 0){
        waitpid(pid2, &status, 0);
        printf("parent: child2 - exit(%d)\n", status);
        waitpid(pid1, &status, 0);
        printf("parent: child1 - exit(%d)\n", status);
    } else if (pid1 == 0 && pid2 == -1){
        sleep(1);
        exit(1);
    } else if(pid1 > 0 && pid2 == 0){
        sleep(2);
        exit(2);
    } else printf("fail to fork\n");
}