1PMDAHELP(3)                Library Functions Manual                PMDAHELP(3)
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NAME

6       pmdaOpenHelp, pmdaGetHelp, pmdaGetInDomHelp, pmdaCloseHelp, - help text
7       support for a PMDA
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C SYNOPSIS

10       #include <pcp/pmapi.h>
11       #include <pcp/impl.h>
12       #include <pcp/pmda.h>
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14       int pmdaOpenHelp(char *fname);
15       char *pmdaGetHelp(int handle, pmID pmid, int type);
16       char *pmdaGetInDomHelp(int handle, pmInDom indom, int type);
17       void pmdaCloseHelp(int handle);
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19       cc ... -lpcp_pmda -lpcp
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DESCRIPTION

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

42       pmdaOpenHelp  returns a negative value for failure, suitable for decod‐
43       ing with pmErrStr(3).  pmdaGetHelp and pmdaGetInDomHelp return NULL  if
44       the corresponding help text does not exist.
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CAVEAT

47       The  PMDA  must  be using PMDA_PROTOCOL_2 or later, as specified in the
48       call to pmdaDSO(3) or pmdaDaemon(3).
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SEE ALSO

51       newhelp(1), PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3),  pmdaInit(3),
52       pmdaText(3) and pmErrStr(3).
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56Performance Co-Pilot                  SGI                          PMDAHELP(3)
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