[Bug 215836] [PATCH] sbin/dmesg: support new flag for watching messages

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215836

--- Comment #3 from Mateusz Guzik <mjg at FreeBSD.org> ---
Granted, I did not know about the limitation, but it hints at a better solution
here:

# procstat -fa | grep klog
  638 syslogd              8 v c r----n--   1   19977 -   /dev/klog

Since syslog already monitors dmesg, you can just inspect the log created by
syslog instead of interfacing with the device.

That said, the feature itself would be nice, but busy checking for work is a
non-starter and it is unlikely it is worth it to make the device openable by
many threads.

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