Nut upsdev - Aug 2009 - /sbin/upsdrvctl unable to shutdown UPS ...

Charles,

When sorting out the library problem for shutdown, please also keep in 
mind that the shutdown scripts (at least those that I have encountered
so far) insist on unmounting /dev/usb. This requires that libusb does 
not rely on its presence to do the reconnection for the shutdown. I don't
know if this is a part of the definition of the functionality of libusb 
and if it can safely be relied upon.

AG

-- 
 ----------------------------------------------------------------------
   Alfred Ganz					alfred-ganz:at:agci.com
   AG Consulting, Inc.				(203) 624-9667
   440 Prospect Street # 11
   New Haven, CT 06511
 ----------------------------------------------------------------------

On Aug 8, 2009, at 9:51 AM, Alfred Ganz wrote:
> Charles,
>
> When sorting out the library problem for shutdown, please also keep in
> mind that the shutdown scripts (at least those that I have encountered
> so far) insist on unmounting /dev/usb. This requires that libusb does
> not rely on its presence to do the reconnection for the shutdown. I  
> don't
> know if this is a part of the definition of the functionality of  
> libusb
> and if it can safely be relied upon.
Alfred,

that does pose a problem - /dev/usb is required by libusb on Linux.

I wonder if the hiddev nodes in /dev still exist at that point?

- Charles

On Sat, 8 Aug 2009, Alfred Ganz wrote:
> Charles,
>
> When sorting out the library problem for shutdown, please also keep
> in mind that the shutdown scripts (at least those that I have
> encountered so far) insist on unmounting /dev/usb. This requires that
> libusb does not rely on its presence to do the reconnection for the
> shutdown. I don't know if this is a part of the definition of the
> functionality of libusb and if it can safely be relied upon.
One option would be to use delayed shutdown and try and guess a good 
grace delay.

This is the way you need to do it in FreeBSD as the disks aren't 
remounted read only after shutdown.

In practise it works OK :)

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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