On 01/01/2011 07:57, Jilles Tjoelker wrote:
On Fri, Dec 31, 2010 at 02:57:17PM -0700, Warner Losh wrote:
On 12/31/2010 07:43, Jilles Tjoelker wrote:
On Thu, Dec 30, 2010 at 06:06:31PM +0000, Pawel Jakub Dawidek wrote:
Author: pjd
Date: Thu Dec 30 18:06:31 2010
New Revision: 216823
URL: http://svn.freebsd.org/changeset/base/216823
Log:
For compatibility with Linux and Solaris add poweroff(8).
It is implemented as a hard link to shutdown(8) and it is equivalent of:
# shutdown -p now
If we go that way, then for consistency reboot(8) and halt(8) should
also be equivalent to calling shutdown -r now and shutdown -h now
respectively, unless conflicting options are given. Linux has a -f
option for what's currently reboot's and halt's default action, and
fastboot(8)/fasthalt(8) could also retain the current behaviour.
I would be in favour of this change.
I'm not sure I'd go this far. I really *LIKE* that halt/reboot is the
low-level interface that shutdown -r now calls. I'm not sure that
moving away from this would be a good idea. It cuts out many levels of
indirection that can be useful in many instances.
But that's not how it works. After printing all the warnings,
shutdown(8) signals init. Ctrl+Alt+Del also signals init (and that's
nontrivial to change, because it's in the kernel).
Only if the strange -o option is used does shutdown execute reboot(8) or
halt(8).
I think the canonical low-level interface should be sending signals to
init. reboot(8) and halt(8) doing things on their own should be banished
to non-default options. (Something should be fixed first so that
/etc/rc.d/mixer doesn't destroy the user's settings from single-user
mode.)
I still strongly disagree with this change, however, the proper place to
talk about it is on a...@. reboot and halt purposely stop init, kill
everything and call reboot. That's what I mean that they are a
lower-level interface than shutdown, which signals init to do its more
complicated, higher level thing asyncrhonously in the background...
Warner
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