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pmdatext(3) [centos man page]

PMDATEXT(3)						     Library Functions Manual						       PMDATEXT(3)

pmdaText - extract metric help text for a PMDA C SYNOPSIS
#include <pcp/pmapi.h> #include <pcp/impl.h> #include <pcp/pmda.h> int pmdaText(int ident, int type, char **buffer, pmdaExt *pmda); cc ... -lpcp_pmda -lpcp DESCRIPTION
As part of the Performance Metrics Domain Agent (PMDA) API (see PMDA(3)), pmdaText uses the standard PMDA(3) data structures to return the help text for metric ident in buffer. The help text must be located in help text files created with newhelp(1), and the associated files are automatically opened by pmdaInit(3). The path to the (basename of the) help text files can be set in the calls to pmdaDSO(3) or pmdaDaemon(3) and overridden by the -h command line option in pmdaGetOpt(3). The encoding of ident follows the internal scheme used below the routines pmLookupText(3) and pmLookupInDomText(3), namely ident encodes either a metric identifier or an instance domain identifier, according to the value of type. The type argument is a bit mask that encodes the interpretation of ident and the requested form of help text, as follows: either PM_TEXT_PMID if ident is a metric identifier, or PM_TEXT_INDOM if ident is an instance domain identifier, plus either PM_TEXT_ONELINE for the one line help text or PM_TEXT_HELP for the full help text. The buffer is managed internally (usually it is cached), and it should not be released or freed by the caller of pmdaText. DIAGNOSTICS
If the requested help text could not be obtained, pmdaText will return PM_ERR_TEXT. CAVEAT
The PMDA must be using PMDA_PROTOCOL_2 or later, as specified in the call to pmdaDSO(3) or pmdaDaemon(3). SEE ALSO
newhelp(1), malloc(3), PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3), pmdaInit(3), pmLookupInDomText(3) and pmLookupText(3). Performance Co-Pilot PCP PMDATEXT(3)

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PMDAATTRIBUTE(3)					     Library Functions Manual						  PMDAATTRIBUTE(3)

pmdaAttribute - informs a PMDA about client connection attributes C SYNOPSIS
#include <pcp/pmapi.h> #include <pcp/impl.h> #include <pcp/pmda.h> int pmdaAttribute(int context, int key, char *value, int length, pmdaExt *pmda); cc ... -lpcp_pmda -lpcp DESCRIPTION
As part of the Performance Metrics Domain Agent (PMDA) API (see PMDA(3)), pmdaAttribute is the generic callback for responding to client connection attributes. These attributes include client credential information, such as user ID and group ID. A PMDA that supports connection attributes will provide a private pmdaAttribute callback by assignment to version.six.attribute of the pmdaInterface structure, and implement custom logic for any of the attribute key-value pairs of interest to it. All attributes are associated with a specific client context, and these can be uniquely identified using the ctx first argument. The PMDA should track client connections, and disconnections using the pmdaSetEndContextCallBack(3) interface, as a result. The pmdaGetContext(3) interface may be particularly helpful also. All attributes are passed as key-value pairs and the value is always passed as a null-terminated string of given length. This includes numeric attributes like the user ID. The most commonly used attributes would be PCP_ATTR_USERID and PCP_ATTR_GROUPID but others may also be optionally passed (such as PCP_ATTR_USERNAME) if they are available. Some attributes will be consumed by pmcd and never through passed to PMDAs, such as PCP_ATTR_PASSWORD. A complete list of all possible attributes can be found in the headers listed above, all are prefixed by PCP_ATTR. DIAGNOSTICS
pmdaAttribute should return either zero on success, or a negative return code to indicate an error in handling the attribute. This return code cannot be used to indicate a client should be disallowed access - such functionality must be performed by the agent in response to callbacks for the client in question (using PM_ERR_PERMISSION for those specific callbacks, for that specific client. In other words, errors will be be passed to PMCD but there is no guarantee made that the error will be return to the client and result in termination of the client, for example. CAVEAT
The PMDA must be using PMDA_PROTOCOL_6 or later, as specified in the call to pmdaDSO(3) or pmdaDaemon(3). SEE ALSO
PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3), pmdaMain(3) and pmdaGetContext(3). Performance Co-Pilot PCP PMDAATTRIBUTE(3)
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