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 header file:
returns the major number encoded in v.
returns the minor number encoded in v.
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September, 2009 LIBPFM(3)