As part of the Performance Metrics Domain Agent (PMDA) API (see
PMDA(3)), this group of routines is used to implement the
processing of a PMDA's metric help information.
These routines are really intended for internal use, and should
not need to be called directly from any PMDA code.
Briefly, the base name of the help text file (as created by
newhelp(1)) is passed in via a -h command line option for a
daemon PMDA or as an argument to pmdaDaemon(3) or pmdaDSO(3).
Then pmdaOpenHelp is called from pmdaInit(3) and returns a handle
that is used in subsequent calls to identify a particular help
text collection (each PMDA typically has only one such
Requests for help text are passed to pmdaText(3) which calls
pmdaGetHelp or pmdaGetInDomHelp as required.
Other than error cases in pmdaOpenHelp, pmdaCloseHelp is not
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