__PMCONNECTLOGGER - reference manual online
Connect to a performance metrics logger control port.
PMCONNECTLOGGER(3) Library Functions Manual PMCONNECTLOGGER(3)
NAME __pmConnectLogger - connect to a performance metrics logger control port C SYNOPSIS #include <pcp/pmapi.h> #include <pcp/impl.h> int __pmConnectLogger(const char *hostname, int pid); cc ... -lpcp DESCRIPTION Each instance of the Performance Co-Pilot (PCP) archive logger program pmlogger(1) sup‐ ports a control port on which __pmControlLog(3) requests are received, and responses sent. Optionally, the pmlogger(1) instance may be designated the ``primary'' logger. __pmConnectLogger may be used to establish a control port connection to the pmlogger(1) instance identified by process id pid on the host hostname. One special case is supported; for the reserved pid value of PM_LOG_CONTROL_PORT the requested connection is to the control port for the ``primary'' logger, whatever its process id might be. On success, __pmConnectLogger returns a non-negative integer, that is a file descriptor that may be used in subsequent communication with the pmlogger(1) instance, e.g. for __pmControlLog(3). As the control port to pmlogger(1) is not mulitplexed, applications using __pmConnectLog‐ ger should use close(2) to terminate the connection to pmlogger(1) as soon as they have finished communicating. If the application connects, and the pmlogger(1) instance subsequently terminates, e.g. because the associated pmcd(1) instance is terminated, the application will have to explicitly re-establish connection to a re-started pmlogger(1) instance by calling __pmConnectLogger again. SEE ALSO pmcd(1), pmlc(1), pmlogger(1), PMAPI(3) and __pmControlLog(3). DIAGNOSTICS PM_ERR_PERMISSION no permission to connect to the specified pmlogger(1) instance -ECONNREFUSED the designated pmlogger(1) instance does not exist -EEADDRINUSE the requested control port is already in usePerformance Co-Pilot PCP PMCONNECTLOGGER(3)
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|refer to||close(2) | PMAPI(3) | pmcd(1) | __pmControlLog(3) | pmlc(1) | pmlogger(1)|