[Bug 244867] [feature request] Provide sysctl kern.boot_id

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244867

            Bug ID: 244867
           Summary: [feature request] Provide sysctl kern.boot_id
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rfraile at rfraile.eu

Hello,


Tracking a new startup of the system usually fall into looking kern.boottime.
But it isn't constant, sometimes drifts over time, so it isn't a 100% reliable
source.

On Linux implemented /proc/sys/kernel/random/boot_id [1] with a random value
generated early at boot, unique for every running kernel instance.

It would be nice to have it on FreeBSD too.



Thanks,



[1] - http://man7.org/linux/man-pages/man3/sd_id128_get_machine.3.html

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