Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!pyramid!ctnews!mitisft!prabhu
From: prabhu@mitisft.Convergent.COM (Prabhu Venkatesh)
Newsgroups: comp.unix.wizards
Subject: STREAMS error returns
Keywords: STREAMS EBADF poor_choice_of_errno
Message-ID: <563@mitisft.Convergent.COM>
Date: 10 Feb 89 00:54:34 GMT
Distribution: usa
Organization: Convergent Technologies, San Jose, CA
Lines: 13

I had this problem with my STREAMS driver. At some point in the
driver, I was queueing a zero-size message to the stream head
read queue,
i.e. (mp->b_wptr - mp->b_rptr == 0).

Even with minpsz at 0, the stream head returned a u.u_error
of EBADF when I tried to read the device.

(1) Should an error be returned at all?
(2) Assuming yes to (1), isn't EBADF a poor choice?
(3) Am I missing something?

prabhu