CVS log for src/sys/kern/sys_eventfd.c

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Pull up following revision(s) (requested by rin in ticket #831):

	sys/kern/sys_eventfd.c: revision 1.11

eventfd(2): Prune dead branch.

Fallout from PR kern/57703 fix.

Pull up following revision(s) (requested by riastradh in ticket #468):
	sys/kern/sys_eventfd.c: revision 1.10
eventfd(2): Omit needless micro-optimization causing PR kern/57703.
Unfortunately, owing to PR kern/57705 and PR misc/57706, it isn't
convenient to flip the xfail switch on a test for this bug.  So we'll
do that separately.  (But I did verify that a rumpified version of
the test postd to PR kern/57703 failed without this change, and
passed with this change.)
PR kern/57703
XXX pullup-10

eventfd(2): Prune dead branch.

Fallout from PR kern/57703 fix.

XXX pullup-10

eventfd(2): Omit needless micro-optimization causing PR kern/57703.

Unfortunately, owing to PR kern/57705 and PR misc/57706, it isn't
convenient to flip the xfail switch on a test for this bug.  So we'll
do that separately.  (But I did verify that a rumpified version of
the test postd to PR kern/57703 failed without this change, and
passed with this change.)

PR kern/57703

XXX pullup-10

Implement eventfd_ioctl() and handle FIONBIO so that fcntl(O_NONBLOCK)
works.  While here, also implement FIONREAD and FIONWRITE, and document
why we don't implement FIONSPACE.

Also implement FIONBIO and FIONREAD for in timerfd_ioctl() (for the same
reason).

PR kern/56718

Fix "restart" semantics -- restart is terminal, so don't clear the
condition when previous waiters have drained.  ("restart" is a bad
name for that this function does, fwiw.)

This should address a kernel assertion failure reported by Chavdar Ivanov
on current-users.

Consistently reference kn->kn_data only within the lock perimeter in
the filtops f_event() callback.

eventfd and timerfd have MPSAFE kq filterops.

Change the kqueue filterops::f_isfd field to filterops::f_flags, and
define a flag FILTEROP_ISFD that has the meaning of the prior f_isfd.
Field and flag name aligned with OpenBSD.

This does not constitute a functional or ABI change, as the field location
and size, and the value placed in that field, are the same as the previous
code, but we're bumping __NetBSD_Version__ so 3rd-party module source code
can adapt, as needed.

NetBSD 9.99.89

eventfd_destroy(): Add missing kmem_free().

KNF, i.e. #include <sys/param.h> then #include <sys/types.h>

Fixes builds

Add native implementations of eventfd(2) and timerfd(2), compatible with
the Linux interfaces of the same name.

Native implementation of the Linux eventfd(2) API.

file sys_eventfd.c was initially added on branch thorpej-futex.