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Re: pmf(9) and Xen domU suspending?
On Sun, 30 Mar 2008, Jared D. McNeill wrote:
> Iain Hibbert wrote:
> > Hi Jared; the manpage is not quite clear on some points, can you clarify?
> > - what is the significance of the bool return value for suspend/resume?
> To indicate that the device was successfully suspended or resumed.
and if a function fails (eg during suspend), what happens to the system?
thanks - more questions however :)
in ubt.c, I see usage of "device_pmf_is_registered(self)" to guard against
multiple instances of registering .. apart from I'm not sure this is
possible [via the _attach function], is this recommended?
is it an error to deregister more than once? ie, if a _detach function
fails something, it may be called multiple times..
is it an error to call pmf_deregister() when pmf_register() has not been
called, or possibly failed?
wrt these last two, would it be 'best practice' to pmf_register() at the
start of the _attach function, then pmf_deregister() at the end of the
_detach (and protect that with an _is_registered() check)?
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