#include <stdio.h>
#include <unistd.h>
#include <math.h>
#include <iostream>
#include <assert.h>
#include <string>
#include <stdlib.h>
#include <map>
#include <stdio.h>
#include <curl/curl.h>
#include <vector>
#include <dirent.h>
#include <sys/stat.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

using namespace std;


int main()
{
   int pid;
   int pc[2]; /* Parent to child pipe */
   int cp[2]; /* Child to parent pipe */
   char ch;
   int incount = 0, outcount = 0;

   /* Make pipes */
   if( pipe(pc) < 0)
   {
      perror("Can't make pipe");
      exit(1);
   }
   if( pipe(cp) < 0)
   {
      perror("Can't make pipe");
      exit(1);
   }


   /* Create a child to run command. */
   switch( pid = fork() )
   {
      case -1:
            perror("Can't fork");
            exit(1);
      case 0:
            /* Child. */
            close(STDOUT_FILENO); /* Close current stdout. */
            dup2(cp[1], STDOUT_FILENO);

            close(STDIN_FILENO);
            dup2(pc[0], STDIN_FILENO);

            close( pc[1]);
            close( cp[0]);
            execlp("cat", "cat", NULL);
            exit(1);
      default:
            /* Parent. */
            /* Close what we don't need. */
            printf("Input to child:\n");

            string theinput("Hey there baby");
            write(pc[1], theinput.c_str(), theinput.size());
            close(pc[1]);

            cout << "The input : " << theinput << endl;


            printf("\nOutput from child:\n");
            close(cp[1]);
            while( read(cp[0], &ch, 1) == 1)
            {
               write(1, &ch, 1);
               outcount++;
            }

            exit(0);
   }

}