/****************************************************
 * This program takes two arguments, creates        *
 * a named FIFO, a reader process (r) and a writer  *
 * process (w):                                     *
 * **************************************************/
#include <iostream>
using namespace std;
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#define MAX 100
// namedPipe1.c++
// $ ./a.out r <pipeName> &   
// $ ./a.out w <pipeName> &     
int main(int count, char *vect[]) {
     int err, pd ;
     char wBuff[] = "This text will be written in pipe",
          rBuff[MAX] = {0};

     if(count < 3) {
          cerr << "Less number of arguments\n" ;
          exit(1) ;
     }
     err = mkfifo(vect[2], 0666) ;
     if(err == -1 && errno != EEXIST){
        cerr << "errno: " << errno << "\n";
        exit(1);
     }
     if(strcmp(vect[1], "r") == 0) { // Reader process
          pd = open(vect[2], O_RDONLY) ;
          read(pd, rBuff, MAX);
          cout << "OutData: " << rBuff << "\n" ;
          close(pd);
     }
     else if(strcmp(vect[1], "w") == 0) { // Writer process
             pd = open(vect[2], O_WRONLY) ;
             write(pd, wBuff, strlen(wBuff)) ;
             close(pd);
          }    
          else {
             cerr << "Wrong 2nd argument\n" ;
             exit(1) ;
          }
     return 0;
}