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Christian Biere wrote:
> Is there any reason why kqueue() doesn't return a EVFILT_READ event
> with EV_EOF set in this case or is this a bug?

I've attached a short program to demonstrate the difference. Should I
send-pr it?

--=20
Christian

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/*
 * To see the effect using when kqueue():
 * cc -DUSE_KQUEUE pipe_test.c -o pipe_test
 *
 * The same using poll():
 * cc pipe_test.c -o pipe_test
 */
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

static void fatal(const char *s);

#ifdef USE_KQUEUE
#include <sys/event.h>
#include <sys/time.h>

static void
wait_for_eof(int fd)
{
  int kq;
  struct kevent kev;
  static const struct timespec ts =3D { 0, 0 };

  kq =3D kqueue();
  if (-1 =3D=3D kq)
    fatal("kqueue");

  EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, 0);
  if (kevent(kq, &kev, 1, 0, 0, &ts))
    fatal("kevent()");

  while (-1 =3D=3D kevent(kq, NULL, 0, &kev, 1, NULL)) {
    if (errno !=3D EINTR)
      fatal("kevent()");
  }
}

#else /* !USE_KQUEUE */

#include <poll.h>

static void
wait_for_eof(int fd)
{
  struct pollfd pfd;

  pfd.fd =3D fd;
  pfd.events =3D POLLIN;
  while (-1 =3D=3D poll(&pfd, 1, INFTIM)) {
    if (errno !=3D EINTR)
      fatal("poll()");
  }
}

#endif

static void
fatal(const char *s)
{
  perror(s);
  exit(EXIT_FAILURE);
}

int main(void)
{
  int fds[2];

  if (pipe(fds))
    fatal("pipe()");
 =20
  switch (fork()) {
  case -1:
    fatal("fork()");
    break;
  case 0: /* Child */
    close(fds[1]);

    wait_for_eof(fds[0]);
    printf("Child terminates now\n");
    exit(EXIT_SUCCESS);
    break;
  default: /* Parent */
    close(fds[0]);
  }

  sleep(4);
  printf("Parent terminates now\n");
  exit(EXIT_SUCCESS);
}


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