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A CTDB_ON_SESSION_LOGON callback is invoked after a successful session logon but before the ctdbLogon() function returns. The handle passed as a parameter with this callback is a session handle. You can safely typecast the handle parameter to a pCTDBSESSION structure pointer.
The session logon callback can be used as an indication that the session is now active and that database and table processing may occur. This callback is a good place to set session-wide parameters that may be active until a session logout is performed.
c-treeDB C API Example
CTDBRET ctdbDECL OnSessionLogon(CTHANDLE Handle)
{
CTDBRET Retval = CTDBRET_OK;
pCTDBSESSION pSession = (pCTDBSESSION)Handle;
if (!pSession)
Retval = CTDBRET_NOTSESSION;
else
{
/* allocate 100 bytes of memory and keep it in the session local tag */
pSession->localTag = pSession->OnAlloc(100);
if (!pSession->localTag)
Retval = CTDBRET_NOMEMORY;
}
return Retval;
}
