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pmidstr(3)

NAME

   pmIDStr,  pmIDStr_r  -  convert  a performance metric identifier into a
   string

C SYNOPSIS

   #include <pcp/pmapi.h>

   const char *pmIDStr(pmID pmid);
   char *pmIDStr_r(pmID pmid, char *buf, int buflen);

   cc ... -lpcp

DESCRIPTION

   For use in error and diagnostic  messages,  pmIDStr  returns  a  `human
   readable'  version  of  the  specified  Performance  Metric  Identifier
   (PMID).  The pmIDStr_r function does the same, but stores the result in
   a user-supplied buffer buf of length buflen, which should have room for
   at least 20 bytes.

   Internally, a PMID is encoded as follows;

        typedef struct {
            int             pad:2;
            unsigned int    domain:8;
            unsigned int    cluster:12;
            unsigned int    item:10;
        } __pmID_int;

   pmIDStr returns a string with each of  the  domain,  cluster  and  item
   subfields appearing as decimal numbers, separated by periods.

   The string value result from pmIDStr is held in a single static buffer,
   so the returned value is only valid until the next call to pmIDStr.

NOTES

   pmIDStr returns a pointer to a static buffer and hence is  not  thread-
   safe.  Multi-threaded applications should use pmIDStr_r instead.

PCP ENVIRONMENT

   Environment variables with the prefix PCP_ are used to parameterize the
   file and directory names used by PCP.  On each installation,  the  file
   /etc/pcp.conf  contains  the  local  values  for  these variables.  The
   $PCP_CONF variable may be used to specify an alternative  configuration
   file,  as  described in pcp.conf(5).  Values for these variables may be
   obtained programmatically using the pmGetConfig(3) function.

SEE ALSO

   PMAPI(3),  pmGetConfig(3),  pmInDomStr(3),  pmTypeStr(3),  pmSemStr(3),
   pmUnitsStr(3), pmLookupDesc(3), pcp.conf(5) and pcp.env(5).



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