pmGetContextHostName (3) - Linux Man Pages
pmGetContextHostName: return the hostname associated with a Performance Co-Pilot context
NAMEpmGetContextHostName, pmGetContextHostName_r - return the hostname associated with a Performance Co-Pilot context
C SYNOPSIS#include <pcp/pmapi.h>
const char *pmGetContextHostName(int id);
char *pmGetContextHostName_r(int id, char *buf, int buflen);
DESCRIPTIONGiven a valid PCP context identifier previously created with pmNewContext(3) or pmDupContext(3), the pmGetContextHostName function returns the hostname associated with id. The pmGetContextHostName_r function does the same, but stores the result in a user-supplied buffer buf of length buflen, which should have room for at least MAXHOSTNAMELEN bytes.
If the context id is associated with an archive source of data, the hostname returned is extracted from the archive label using pmGetArchiveLabel(3).
For live contexts, an attempt will first be made to retrieve the hostname from the PCP collector system using pmFetch(3) with the pmcd.hostname metric. This allows client tools using this interface to retrieve an accurate host identifier even in the presence of port forwarding and tunnelled connections.
Should this not succeed, then a fallback method is used. For local contexts - with local meaning any of DSO, ``localhost'' or Unix domain socket connection - a hostname will be sought via gethostname(3). For other contexts, the hostname extracted from the initial context host specification will be used.