#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
/* Write your solution for lab5 here! It should (must!) use dup/close/dup2,
 * fork, and exec to read text from a file and feed that to the standard input
 * of the reverseWord executable. The program looks something like:
 * 1    open file using path provided as a program argument,
 * 2    fork to create a child process,
 * 3    dup file into standard input in child process,
 * 4    promote the child process to the reverseWord executable using exec,
 * 5    close the file in the parent process, and
 * 6    wait for the child process to terminate before printing out "done." */

// fork to create child process

// dup file into standard input in child process

int main(int argc, char* argv[]) {
    if (argc != 2) {
        printf("usage: rev <filename>\n");
    }

    // Open file
    int file_d = open(argv[1]);
    printf("File destination: %d\n", file_d);
    dup2(file_d, 1);
    printf("Dupe destination: %d\n", 0);

    pid_t child = fork();
    if (child == 0) {
        printf("In child!\n");
        execl("./reverseWord", "./reverseWord", NULL);
        printf("Something went wrong in the child!\n");
        return -1;
    } else {
        printf("In parent!\n");
        // Close file
        printf("Waiting for child.\n");
        while (child = wait(0) > 0);
        printf("Stopped waiting, child has ended.\n");
        return -1;
    }

   return 0;
}