[Bug 3531] Ssh will not exit when it receives SIGTERM before calling poll in client_wait_until_can_do_something until some events happen.

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3531

--- Comment #5 from Damien Miller <djm at mindrot.org> ---
That sort of race condition is exactly what ppoll() is designed to
avoid. 

We can test quit_pending with signals blocked and have ppoll(3)
atomically unblock them, so it would instantly be interrupted if a
SIGTERM came in before ppoll() started. Have a look at how serverloop.c
does it.

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