tests/unix_stream: peer's shutdown(SHUT_WR) must wake up any event mech

tests/unix_stream: refactor event mech tests

Provide a context that can be used both for writability and readability
checks. This collapses two check functions per mech into one. Provide a
possibil

tests/unix_stream: refactor event mech tests

Provide a context that can be used both for writability and readability
checks. This collapses two check functions per mech into one. Provide a
possibility to check advanced features of an event mech, e.g. returned
kev_flags for kevent(2).

Should be no functional change.

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tests: ensure that unix/stream raises POLLIN after a shutdown(2)

This tests for the bug fixed in
6ac71c4a52348 ("unix/stream: fix poll on a peer shutdown(2)ed socket"),
where-in the remote side has

tests: ensure that unix/stream raises POLLIN after a shutdown(2)

This tests for the bug fixed in
6ac71c4a52348 ("unix/stream: fix poll on a peer shutdown(2)ed socket"),
where-in the remote side has shutdown writes on their side and the other
end fails to return from select(2)/poll(2) because we weren't surfacing
it as readable.

Reviewed by: adrian, kib
Differential Revision: https://reviews.freebsd.org/D50602

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unix: fix EVFILT_WRITE when peer close(2)s and shutdown(2)s

For the close(2) case restore reporting the event with EV_EOF set. This
fixes bug 286692.

For the shutdown(2) case restore original beha

unix: fix EVFILT_WRITE when peer close(2)s and shutdown(2)s

For the close(2) case restore reporting the event with EV_EOF set. This
fixes bug 286692.

For the shutdown(2) case restore original behavior, but leave comment that
we may want to change that. The d15792780760 was not intended to bring in
functional API changes.

Provide tests for both cases.

PR: 286692
Fixes: d15792780760ef94647af9b377b5f0a80e1826bc

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tests/unix_stream: improve writable test

In addition with non-blocking checks on writability, add blocking once
with help of pthread(3).

tests/unix_stream: fix signedness error

Fixes: bc7ee0b52a8dd613711c7225244aac954b41e534

tests/unix_stream: add test that checks a full socket isn't writable

tests/unix_stream: test that send(2) of zero bytes is successful

Put this simple test into an existing file. We don't have a designated
file for all unix/stream tests. There is extensive unix_seqp

tests/unix_stream: test that send(2) of zero bytes is successful

Put this simple test into an existing file. We don't have a designated
file for all unix/stream tests. There is extensive unix_seqpacket_test,
but (at least right now) unix/seqpacket is not a superset of unix/stream,
but a different implementation. We have one file that does one test for
unix/stream - unix_socketpair_test. So rename it to unix_stream and start
collecting all unix/stream tests in it.

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