/*
 * fifoRead.c++ shows that the process is blocked on open  
 *                as there is no writing process
 * $ mkfifo -m 0666 myFIFO
 * $ g++ -Wall fifoRead.c++ -o fifoRead
 * $ g++ -Wall fifoWrite.c++ -o fifoWrite
 * $ ./fifoRead myFIFO &
 * $ ./fifoWrite myFIFO &
 */
#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

// $ mkfifo -m 0666 myFIFO
// $ g++ -Wall fifoRead.c++ -o fifoRead
// $ g++ -Wall fifoWrite.c++ -o fifoWrite
// $ ./fifoRead myFIFO &
// $ ./fifoWrite myFIFO &

int main(int ac, char *av[]) {
    int pd;
    char buff[MAX];
 
    if(ac < 2){
      cerr << "FIFO name not specified\n";
      exit(1);
    }
    pd = open(av[1], O_RDONLY);
    if(pd == -1){
      cerr << "FIFO open error\n";
      exit(1);
    }
    cout << "Not printed until fifoWrite\n";
    read(pd, buff, 100);
    cout << "Data read: " << buff << endl;

    close(pd);
    return 0;
}