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

define MAXLINE 1024   /* max line size */

int Dup2(int oldfd, int newfd);

int Dup2(int oldfd, int newfd) {
    int ret_val;
    ret_val = dup2(oldfd, newfd);
    if (ret_val == -1) {
        fprintf(stderr, "fd redirection failed\n");
        exit(-1);
    }
    return ret_val;
}

int main() {
    char str_buf[MAXLINE];
    int fds[2], wait_status, tty;
    pid_t pid;

    pipe(fds);

    pid = fork();
    printf("pid: %d\n", pid);

    if (pid == 0) {
        printf("hello???\n");
        Dup2(fds[0], STDIN_FILENO);
        Dup2(fds[1], STDOUT_FILENO);
        printf("Input something: \n");
        fgets(str_buf, MAXLINE, stdin);
        close(fds[0]);
        printf("CHILD: writing to pipe...\n");
        write(fds[1], str_buf, MAXLINE);
        exit(0);
    } else {
        waitpid(pid, &wait_status, 0);
        printf("wait_status: %d\n", WIFEXITED(wait_status));
        close(fds[1]);
        printf("PARENT:\n");
    }
}