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kqueue: document how timers with low/past timeouts are handled

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Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D32237
This commit is contained in:
Kyle Evans 2021-09-30 13:19:05 -05:00
parent 9c999a259f
commit 4b5554cebb
1 changed files with 7 additions and 1 deletions
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8
lib/libc/sys/kqueue.2
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd September 23, 2021
.Dd September 30, 2021
.Dt KQUEUE 2
.Os
.Sh NAME
@ -599,6 +599,12 @@ On return,
.Va fflags
contains the events which triggered the filter.
.Pp
Periodic timers with a specified timeout of 0 will be silently adjusted to
timeout after 1 of the time units specified by the requested precision in
.Va fflags .
If an absolute time is specified that has already passed, then it is treated as
if the current time were specified and the event will fire as soon as possible.
.Pp
If an existing timer is re-added, the existing timer will be
effectively canceled (throwing away any undelivered record of previous
timer expiration) and re-started using the new parameters contained in