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pmatomstr(3)


NAME

   pmAtomStr,  pmAtomStr_r  -  convert  a  performance metric value into a
   string

C SYNOPSIS

   #include <pcp/pmapi.h>

   const char *pmAtomStr(const pmAtomValue *avp, int type);
   char *pmAtomStr_r(const pmAtomValue *avp,  int  type,  char  *buf,  int
   buflen);

   cc ... -lpcp

DESCRIPTION

   All  performance  metric  values may be encoded in a pmAtomValue union,
   defined as follows;

        typedef union {
            __int32_t    l;     /* 32-bit signed */
            __uint32_t   ul;    /* 32-bit unsigned */
            __int64_t    ll;    /* 64-bit signed */
            __uint64_t   ull;   /* 64-bit unsigned */
            float        f;     /* 32-bit floating point */
            double       d;     /* 64-bit floating point */
            char         *cp;   /* char ptr */
            pmValueBlock *vbp;  /* pmValueBlock ptr */
        } pmAtomValue;

   Given the performance metric value pointed to by avp, and a performance
   metric  type defined by type, pmAtomStr will generate the corresponding
   metric value as a string, suitable for  diagnostic  or  report  output.
   The  pmAtomStr_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 80 bytes.

   The  value  for  type  is  typically extracted from a pmDesc structure,
   following a  call  to  pmLookupDesc(3)  for  a  particular  performance
   metric.

   If  the type is PM_TYPE_STRING values longer than 38 characters will be
   truncated after 34  characters,  and  truncation  shown  with  ellipsis
   ``...'' at the end of the value.

   If  the  type  is  PM_TYPE_AGGREGATE  then up to the first three 32-bit
   words are displayed as hexadecimal values.

   If the type is PM_TYPE_EVENT then a summary  of  the  number  of  event
   records found in the value is generated.

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

NOTES

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

SEE ALSO

   PMAPI(3),     pmConvScale(3),    pmExtractValue(3),    pmLookupDesc(3),
   pmPrintValue(3), pmTypeStr(3) and pmUnitsStr(3).



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