#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>

int
main ()
{
  int fd, nfds;
  fd_set readfds;
  ssize_t nbytes;
  char buf[5];

  if (mkfifo ("/tmp/myfifo", S_IRUSR | S_IWUSR | S_IWGRP) < 0
      && errno != EEXIST)
    {
      perror ("mkfifo");
      exit (-1);
    }

  if ((fd = open ("/tmp/myfifo", O_RDONLY)) < 0)
    {
      perror ("open");
      exit (-1);
    }

  FD_ZERO (&readfds);
  FD_SET (fd, &readfds);

  if ((nfds = select (fd + 1, &readfds, NULL, NULL, NULL)) < 0)
    {
      perror ("select");
      exit (-1);
    }

  if (FD_ISSET (fd, &readfds))
    printf ("/tmp/myfifo is ready for reading\n");
  else
    printf ("something's wrong\n");
  nbytes = read (fd, buf, 4);
  if (nbytes != 4)
    {
      perror ("read");
      exit (-1);
    }
  buf[4] = '\0';
  printf ("read %d bytes: %s\n", nbytes, buf);
  if (close (fd) < 0)
    {
      perror ("close");
      exit (-1);
    }
}