1.3.3: fcntl F_{SETOWN,ASYNC} seems broken?

[Rony Shapiro]

Hi,

Trying to get Nickle ( http://www.nickle.org/ ) to work under Cygwin, I'm
having problems getting stdin to work in async/nonblocking mode (that is, to
get a SIGIO when the user enters text). This is on a Windows 2000 (SP2)
running cygwin 1.3.3.

Here's the code fragment that seems to be the problem, symptoms in comments:

void
FileSetFd (int fd)
{
    int	flags;

    fcntl (fd, F_SETOWN, getpid()); // This return EINVAL

    flags = fcntl (fd, F_GETFL);
    flags |= F_ASYNC|F_NOBLOCK;
    fcntl (fd, F_SETFL, flags) != 0); // This succeeds, but has no effect
    { // Tried the following based on something I found in the cygwin mail
archive,
	// to no avail.
      int yesplease = 1;
      ioctl( fd, FIOASYNC, &yesplease );
    }
}

Possibly relevant info: Nickle is a multi-threading (posix threads)
application, hence the need for async I/O. User-visible symptom: Prompt is
displayed, but no response to keyboard. Sending SIGIO via 'kill' from
amother shell causes the user input to be processied correctly!

>From the mailing list archive, I see a few questions about this, but no
answers. perusing the source & ChangeLogs isn't very informative either, I'm
afraid.

Any information on the status of this (known bug, never to be implemented,
etc.) gratefully accepted.

   Thanks,

      Rony


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