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Paul Durrant
2b02882ebb
A domid is considered recent if the domain it represents was destroyed
less than a specified number of seconds ago. For debugging and/or testing
purposes the number can be set using the environment variable
LIBXL_DOMID_REUSE_TIMEOUT. If the variable does not exist then a default
value of 60s is used.
Whenever a domain is destroyed, a time-stamped record will be written into
a history file (/var/run/xen/domid-history). To avoid the history file
growing too large, any records with time-stamps that indicate that the
age of a domid has exceeded the re-use timeout will also be purged.
A new utility function, libxl__is_recent_domid(), has been added. This
function reads the same history file checking whether a specified domid
has a record that does not exceed the re-use timeout. Since this utility
function does not write to the file, no records are actually purged by it.
NOTE: The history file is purged on boot to it is safe to use
CLOCK_MONOTONIC as a time source.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Ian Jackson <ian.jackson@eu.citrix.com>