watchdogd: Add -k kenv option to store the process ID.
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Authored by ray on Mon, May 25, 8:02 AM.

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Reviewers

glebius
imp
pjd
jmg

Summary

Storing the PID in the kernel environment provides access to it when operating
on read-only filesystems. Additionally, it prevents issues with stale PID
files left behind if watchdogd is terminated by SIGKILL.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 73416
Build 70299: arc lint + arc unit

Event Timeline

ray created this revision.Mon, May 25, 8:02 AM

Herald added a subscriber: ziaee. · View Herald TranscriptMon, May 25, 8:02 AM

ray requested review of this revision.Mon, May 25, 8:02 AM

Harbormaster completed remote builds in B73416: Diff 178541.Mon, May 25, 8:02 AM

glebius added reviewers: pjd, jmg.Mon, May 25, 6:14 PM

To me this looks like a more generic problem rather than just the watchdogd's problem. Should every daemon have this feature? Or should we say that /var/run shall be mdmfs(8) on hosts with read-only root?

I added authors of the pidfile(3) to add people who definitely thought a lot on this problem.