Date: Fri, 31 Mar 2000 16:30:57 -0800
From: Jordan Mendelson <jordy@napster.com>
For some reason, POLLHUP is not being raised on poll() of a
properly closed socket under 2.3.99-pre4-2. It repeatedly returns
only POLLIN and read() returns 0.
This behavior did not seem to happen under 2.2.x.
Debian unstable w/ gcc 2.95.2 (debian 20000313 build).
Are you performing a full close, or just a half-close. If a half
close, POLLHUP should not be raised if either write or the read side
can still move data. POLLHUP is only to be sent when both the send
and receive side of the socket is closed. This is necessary because
POLLHUP's semantics were not designed with a half close in mind.
See the commentary in net/ipv4/tcp.c:tcp_poll(), this behavior
match the behavior of many other OS's, including Solaris HPUX and
others.
Later,
David S. Miller
davem@redhat.com
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