K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2021-10-06T07:08:33.834266Z
K 7
svn:log
V 914
kqueue: don't arbitrarily restrict long-past values for NOTE_ABSTIME

NOTE_ABSTIME values are converted to values relative to boottime in
filt_timervalidate(), and negative values are currently rejected.  We
don't reject times in the past in general, so clamp this up to 0 as
needed such that the timer fires immediately rather than imposing what
looks like an arbitrary restriction.

Another possible scenario is that the system clock had to be adjusted
by ~minutes or ~hours and we have less than that in terms of uptime,
making a reasonable short-timeout suddenly invalid. Firing it is still
a valid choice in this scenario so that applications can at least
expect a consistent behavior.

(cherry picked from commit 9c999a259f00b35f0467acd351fea9157ed7e1e4)
(cherry picked from commit 2f4dbe279f6b5eb87ec493d96f6943ffdb603ba0)

Git Hash:   f9765c9c1acbd42c074841c96c0e84d32ad1b1a1
Git Author: kevans@FreeBSD.org
END