The routine pmTraversePMNS may be used to perform a depth-first
traversal of the Performance Metrics Name Space (PMNS).
The traversal starts at the node identified by name - if name is an
empty string (i.e. ""), the traversal starts at the root of the PMNS.
Usually name would be the pathname of a non-leaf node in the PMNS.
For each leaf node (i.e. performance metric) found in the traversal,
the user-supplied routine dometric is called with the full pathname
of that metric in the PMNS as the single argument. This argument is
null-byte terminated, and is constructed from a buffer that is
managed internally to pmTraversePMNS. Consequently the value is only
valid during the call to dometric - if the pathname needs to be
retained, it should be copied using strdup(3) before returning from
The pmTraversePMNS_r routine performs the same function, except the
callback method func_r has an additional parameter that will be
closure from the initial call to pmTraversePMNS_r. The additional
parameter to pmTraversePMNS_r and the callback method allows the
caller to pass context through pmTraversePMNS_r and into the callback
method func_r, making the service more useful for multi-threaded
applications where thread-private data can be accessed in the
callback method via the closure argument.
On success pmTraversePMNS returns the number of children of name,
which may be zero.
Failed to access a PMNS for operation. Note that if the
application hasn't a priori called pmLoadNameSpace(3) and
wants to use the distributed PMNS, then a call to
pmTraversePMNS must be made inside a current context.
The initial pathname name is not valid in the current PMNS.
Other diagnostics are for protocol failures when accessing the
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Performance Co-Pilot PCP PMTRAVERSEPMNS(3)