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

6       pmParseMetricSpec,  pmFreeMetricSpec  -  uniform  metric  specification
7       parser
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C SYNOPSIS

10       #include <pcp/pmapi.h>
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12       int pmParseMetricSpec(const char *string, int isarch, char *source,
13               pmMetricSpec **rsltp, char **errmsg);
14       void pmFreeMetricSpec(pmMetricSpec *rslt);
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16       cc ... -lpcp
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DESCRIPTION

19       pmParseMetricSpec accepts a string specifying the name of a PCP perfor‐
20       mance metric, and optionally the source (either a hostname or a PCP ar‐
21       chive filename) and instances for that metric.  The syntax is described
22       in PCPIntro(1).
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24       If neither host nor archive component of the  metric  specification  is
25       provided,  the  isarch and source arguments are used to fill in the re‐
26       turned pmMetricSpec structure.
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28       The pmMetricSpec structure that is returned via  rsltp  represents  the
29       parsed string and has the following declaration:
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31           typedef struct {
32               int     isarch;      /* source type: 0 -> live host, 1 -> archive, 2 -> local context */
33               char    *source;     /* name of source host or archive */
34               char    *metric;     /* name of metric */
35               int     ninst;       /* number of instances, 0 -> all */
36               char    *inst[1];    /* array of instance names */
37           } pmMetricSpec;
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39       pmParseMetricSpec  returns  0  if  the  given  string  was successfully
40       parsed.  In this case all the storage  allocated  by  pmParseMetricSpec
41       can  be released by a single call to free(3) using the address returned
42       from pmMetricSpec via rsltp.  The convenience macro pmFreeMetricSpec is
43       a thinly disguised wrapper for free(3).
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45       pmParseMetricSpec  returns  PM_ERR_GENERIC  and a dynamically allocated
46       error message string in errmsg, if the given string does not parse.  Be
47       sure to free(3) the error message string in this situation.
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49       In  the  case of an error, rsltp is undefined.  In the case of success,
50       errmsg is undefined.  If rsltp->ninst is 0, then rsltp->inst[0] is  un‐
51       defined.
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SEE ALSO

54       PMAPI(3) and pmLookupName(3).
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