C SYNOPSIS

#include <pcp/pmapi.h>

const char *pmAtomStr(const pmAtomValue *avp, int type)

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 */
 void *vp; /* void ptr */
} pmAtomValue;

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

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 only the first three 32-bit words are displayed as hexadecimal values.

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