[issue5380] pty.read raises IOError when slave pty device is closed

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

> Well, as I suggested, in FileIO.read(): when receiving errno=5 on a
> read() call and if S_IFIFO() returns true, clear errno and return an
> empty string.
> The question is whether a genuine EIO error ("low level IO error") can
> occur on a FIFO. Intuitively, I'd say "no" since a FIFO is only a
> software communication channel, but who knows...

OK, that sounds reasonable. (I missed that in the discussion on the
bug, sorry. I tend not to download files unless I actually am on the
hook for code reviewing them, so any details that were only obvious
from the patch may have gone by me.)

Of course, you should check if those symbols even exist before referencing them.

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<http://bugs.python.org/issue5380>
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