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

int main() {
    pid_t pid;
    int status, i;
    if (fork() == 0) {
        printf("This is the child process. pid =%d\n", getpid());
        exit(5);
    } else {
        sleep(1);
        printf("This is the parent process, wait for child... \n");
        pid = wait(&status);
        i = WEXITSTATUS(status);
        printf("child's pid =%d . exit status=%d\n", pid, status);
    }
}