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require_bsd and require_mods(':fcntl_lock') are now
supported in TestCommon to make it easier to maintain
than a big list of regexps.
getsockopt for SO_ACCEPTFILTER seems to always succeed,
even if the retrieved struct is all zeroes.
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This allows us to cut down on imports and reduce code.
This also makes it easier (in the next commit) to provide an option
to disable epoll/kqueue when saving an FD is valued over scalability.
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Using "make update-copyrights" after setting GNULIB_PATH in my
config.mak
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I didn't wait until September to do it, this year!
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Our attempt at using a self-pipe in signal handlers was
ineffective, since pure Perl code execution is deferred
and Perl doesn't use an internal self-pipe/eventfd. In
retrospect, I actually prefer the simplicity of Perl in
this regard...
We can use sigprocmask() from Perl, so we can introduce
signalfd(2) and EVFILT_SIGNAL support on Linux and *BSD-based
systems, respectively. These OS primitives allow us to avoid a
race where Perl checks for signals right before epoll_wait() or
kevent() puts the process to sleep.
The (few) systems nowadays without signalfd(2) or IO::KQueue
will now see wakeups every second to avoid missed signals.
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Oops, IO::KQueue support was broken due to this missing
constant. Add a new ds-kqxs.t test case to ensure we
test the IO::KQueue path if IO::KQueue is available.
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