kqueue: document how timers with low/past timeouts are handled
Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D32237
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 23, 2021
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.Dd September 30, 2021
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.Dt KQUEUE 2
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.Os
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.Sh NAME
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@ -599,6 +599,12 @@ On return,
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.Va fflags
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contains the events which triggered the filter.
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.Pp
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Periodic timers with a specified timeout of 0 will be silently adjusted to
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timeout after 1 of the time units specified by the requested precision in
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.Va fflags .
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If an absolute time is specified that has already passed, then it is treated as
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if the current time were specified and the event will fire as soon as possible.
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.Pp
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If an existing timer is re-added, the existing timer will be
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effectively canceled (throwing away any undelivered record of previous
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timer expiration) and re-started using the new parameters contained in
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