__pmConnectLogger − connect to a performance metrics logger control port
int __pmConnectLogger(const char *hostname, int pid);
cc ... −lpcp
Each instance of the Performance Co-Pilot (PCP) archive logger program pmlogger(1) supports 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.
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.
no permission to connect to the specified pmlogger(1) instance
the designated pmlogger(1) instance does not exist
the requested control port is already in use