Xen devel - Aug 2010 - [PATCH 2/7] vtpm Mini-Os domain: vtpm hotplug stability fixes

Signed-off-by: Matthew Fioravante <Matthew.Fioravante@jhuapl.edu>

The following patch provides stability fixes for the vtpm hotplug system.

There were several cases where the hotplug system would get in a bad 
state and would hang because of a stale lockfile that never got cleaned 
up. The pipes that talk to the manager could also get left in a bad state.

The hotplug scripts as they are now only work correctly if one file lock 
is set. If 2 or more file locks are created and the script exits on an 
error, the trap cleanup will only release the last lock.

This patch also adds a binary called vtpmmgrtalk which talks to the 
manager using the console fifos. It uses non-blocking IO to open the 
fifos so it can quit immediatly with an error if the manager is not 
listening on the other side. The hotplug scripts now use this program to 
talk to the manager.



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