Exit providers can supply an MQ_BACK_EXIT function to intercept the MQBACK call. If the unit of work is being coordinated by an external unit-of-work manager, MQ_BACK_EXIT is also invoked in response to the application issuing the unit-of-work manager's back-out call.
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The MQ_BACK_EXIT call has the following parameters.
Exit parameter structure.
Exit context structure.
Connection handle.
Completion code.
Reason code qualifying pCompCode.
MQ_BACK_EXIT (&ExitParms, &ExitContext, &Hconn,
&CompCode, &Reason);
The parameters passed to the exit are declared as follows:
PMQAXP pExitParms; /* Exit parameter structure */ PMQAXC pExitContext; /* Exit context structure */ PMQHCONN pHconn; /* Connection handle */ PMQLONG pCompCode; /* Completion code */ PMQLONG pReason; /* Reason code qualifying CompCode */