[Bug 260116] [sctp] POLLOUT/EVFILT_WRITE is always true for poll/kqueue

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260116

--- Comment #8 from Björn 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 existed
for many years without any mention of it by users on mailinglists, which makes
me wonder.

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

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