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pmunitsstr(3)


NAME

   pmUnitsStr,  pmUnitsStr_r - convert a performance metric's units into a
   string

C SYNOPSIS

   #include <pcp/pmapi.h>

   const char *pmUnitsStr(const pmUnits *pu);
   char *pmUnitsStr_r(const pmUnits *pu, char *buf, int buflen);

   cc ... -lpcp

DESCRIPTION

   The encoding of a performance metric's dimensionality and scale uses  a
   pmUnits structure; see pmLookupDesc(3).

   As  an  aid  to  labeling  graphs  and  tables,  or for error messages,
   pmUnitsStr will take a dimension and scale specification as per pu, and
   return  the  corresponding text string.  The pmUnitsStr_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 60 bytes.  If buflen is
   less than 60 then pmUnitsStr_r returns NULL and buf is not changed.

   For example {1, -2, 0, PM_SPACE_MBYTE, PM_TIME_SEC, 0}, as the value of
   *pu gives the result string Mbyte / sec^2.

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

   If  the ``count'' dimension is non-zero, and the ``count'' scale is not
   zero, then the text string will include a decimal scaling  factor,  eg.
   count x 10^6.

   As  a  special  case, if all components of the dimension are zero, then
   the ``count'' scale is used to produce the text.  If this scale is zero
   the  result  is an empty string, otherwise the result is of the form x1
   0^2.

NOTES

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

SEE ALSO

   PMAPI(3),     pmAtomStr(3),     pmConvScale(3),      pmExtractValue(3),
   pmLookupDesc(3),     pmPrintValue(3),     pmIDStr(3),    pmInDomStr(3),
   pmTypeStr(3), pmSemStr(3) and pmUnitsStr(3).



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