/* File: test_closing a file descriptor */

#include <poll.h>
#include <stdio.h>
#include <unistd.h>

/* Test poll(2) on pipes.  */

static int
test_pipe (void)
{
  int fd[2];
  char buf[3];
  pipe (fd);
  struct pollfd pfd;
  int nfound = -1;

  pfd.fd = fd[1];
  pfd.events = POLLIN | POLLOUT;
  pfd.revents = 0;

  printf ("Pipe created: Read fd[0] = %d, Write fd[1] = %d\n", fd[0], fd[1]);
  write (fd[1], "foo", 3);
  read (fd[0], buf, 3);
  close (fd[0]);
  printf ("After closing fd[0] = %d\n", fd[0]);
  printf ("Input: pfd.events = (POLLIN | POLLOUT) = %d\n", pfd.events);
  nfound = poll (&pfd, 1, -1);
  printf ("Output: pfd.revents = %d\n", pfd.revents);
  printf("Result: pfd.revents & (POLLHUP | POLLERR) = %d & %d = %d\n", pfd.revents, (POLLHUP | POLLERR), pfd.revents & (POLLHUP | POLLERR));
  if ((pfd.revents & (POLLHUP | POLLERR)) == 0)
    printf ("ERROR: expecting (POLLHUP | POLLERR) after shutdown\n");

  close (fd[1]);

  return nfound;
}


int
main ()
{
  int result = -1;

  printf ("\npoll parameters:\n");
  printf ("POLLIN  = %2d, POLLPRI = %2d, POLLOUT  = %2d\n", POLLIN, POLLPRI,POLLOUT);
  printf ("POLLERR = %2d, POLLHUP = %2d, POLLNVAL = %2d\n", POLLERR, POLLHUP, POLLNVAL);
  printf ("POLLRDNORM = %3d, POLLRDBAND = %3d\n", POLLRDNORM, POLLRDBAND);
  printf ("POLLWRNORM = %3d, POLLWRBAND = %3d\n", POLLWRNORM, POLLWRBAND);

#ifdef __GNU__
#include <hurd/hurd_types.h>
#define SELECT_ALL (SELECT_READ | SELECT_WRITE | SELECT_URG)
#define SELECT_RETURNED ((SELECT_ALL << 1) & ~SELECT_ALL)
  printf ("SELECT_READ = %3d, SELECT_WRITE = %3d, SELECT_URG= %3d\n", SELECT_READ, SELECT_WRITE, SELECT_URG);
  printf ("SELECT_ALL = %3d, SELECT_RETURNED = %3d\n", SELECT_ALL, SELECT_RETURNED);
#endif

  printf("\nPipe test\n=========\n");
  result = test_pipe();

  return result;
}