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sys: add OpenBSD support

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Add OpenBSD support, including pledge(2) support by implementing
SYS_EnableSystemCallFilter().

This commit depends on the addition of AdjustFreq() privops and the
addtion of invoking SYS_EnableSystemCallFilter() from PRV_StartHelper().

Only system call filter levels on/off' are supported. Setting level
to 0 disables the filter and setting it to 1 enables it.

Update the documentation to reflect that OpenBSD supports:
- the SCHED_FIFO real-time scheduler (option -P)
- locking chronyd into memory (option -m)
- reload sample history of servers and ref clocks (option -r)
- forking into two process when run as non-root user (option -u)
- maxdrift/maxslewrate of 100000.
This commit is contained in:
Thomas Kupper
2026-02-04 22:09:09 +01:00
committed by Miroslav Lichvar
parent 9a57ef8dbf
commit 4ddc6b334d
9 changed files with 425 additions and 44 deletions
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README
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@@ -27,9 +27,9 @@ operating parameters whilst it is running.
What will chrony run on?
========================
The software is known to work on Linux, FreeBSD, NetBSD, macOS and
illumos. Closely related systems may work too. Any other system will
likely require a porting exercise.
The software is known to work on Linux, FreeBSD, NetBSD, OpenBSD, macOS,
and illumos. Closely related systems may work too. Any other system
will likely require a porting exercise.
How do I set it up?
===================