The branch main has been updated by kevans:
URL:
https://cgit.FreeBSD.org/src/commit/?id=4b5554cebb66020f59dc869b835aebbd66e4bb8c
commit 4b5554cebb66020f59dc869b835aebbd66e4bb8c
Author: Kyle Evans <kev...@freebsd.org>
AuthorDate: 2021-09-30 18:19:05 +0000
Commit: Kyle Evans <kev...@freebsd.org>
CommitDate: 2021-10-01 02:31:28 +0000
kqueue: document how timers with low/past timeouts are handled
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D32237
---
lib/libc/sys/kqueue.2 | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2
index 3ded4ae3d8f7..72b3e544391c 100644
--- a/lib/libc/sys/kqueue.2
+++ b/lib/libc/sys/kqueue.2
@@ -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
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