__pmCheckAttribute - Man Page
check value for a client connection attribute
C Synopsis
#include "pmapi.h"
#include "libpcp.h"
int __pmCheckAttribute(__pmAttrKey attr, const char * value);
cc ... -lpcp
Caveat
This documentation is intended for internal Performance Co-Pilot (PCP) developer use.
These interfaces are not part of the PCP APIs that are guaranteed to remain fixed across releases, and they may not work, or may provide different semantics at some point in the future.
Description
Connection attributes are exchanged between pmcd(1) and PCP client tools at the start of the protocol exchange. They provide optional information relating to an individual connection, such as the name of a specific container that is under analysis by the client.
__pmCheckAttribute verifies that the given attribute attr follows the expected syntax for that type of attribute. This assists with the prevention of malicious content being accepted by pmcd as these attributes may subsequently be used in parsers or carried into structured output such as JSON format.
Return Values
When presented with an unrecognised attribute or an invalid value for the specified attribute, __pmCheckAttribute returns a negative value suitable for reporting with pmErrStr(3). Otherwise the return value is zero indicating success.
See Also
pmdbg(1), PMAPI(3) and pmErrStr(3).