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Date: Fri, 10 Dec 2010 02:35:00 -0500 (EST)
From: Garrett Wollman <wollman@hergotha.csail.mit.edu>
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Cc: stable@freebsd.org
Subject: Re: /sbin/reboot
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In article <AANLkTikgGSyRLnDS6Oihw2u3SYjeZRrQWdSa9Z4t7UAE@mail.gmail.com>, 
amvandemore@gmail.com writes:

>For the correct order, "shutdown -r" calls reboot which calls init which
>calls rc.shutdown.

No.  shutdown(8) sends a SIGINT to init(8), which runs rc.shutdown and
then calls reboot(2) as its last act.

reboot(8) freezes init(8), then sends a SIGTERM to anything left
running, then sends a SIGKILL to anything left running, then calls
reboot(2) as its last act.

>Doing a shutdown -r is the same as a reboot without the warning to logged in
>users and shutdown handles the logging instead of reboot.

Not even close.

-GAWollman