This function can be called at any time to get the revision level of
the library. It is not necessary to have invoked pfm_initialize()
prior to calling this function.
The revision number is composed of two fields: a major number and a
minor number. Both can be extracted using macros provided in the
returns the major number encoded in v.
returns the minor number encoded in v.
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September, 2009 LIBPFM(3)