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Date:      Tue, 08 Feb 2022 18:30:50 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 260116] [sctp] POLLOUT/EVFILT_WRITE is always true for poll/kqueue
Message-ID:  <bug-260116-227-wdORm9oA4L@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-260116-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-260116-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260116

--- Comment #8 from Bj=C3=B6rn Svensson <bjorn.a.svensson@est.tech> ---
I have noted that the non-blocking section
(https://datatracker.ietf.org/doc/html/rfc6458#section-3.2) mention that an
application should use caution when writing to a 1-to-many style socket and
using select()/poll(). The handling of the sendbuffer is implementation
specific.

For 1-to-1 style sockets I can't see such warning in
https://datatracker.ietf.org/doc/html/rfc6458#section-4, but maybe I have
missed something.
Looking at the git history also indicates that this issue should have exist=
ed
for many years without any mention of it by users on mailinglists, which ma=
kes
me wonder.

Is the assumption that we should be able to use poll() on a 1-to-1 style so=
cket
to get sendbuffer full indications maybe wrong?

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