CFMachPortGetInvalidationCallBack(_:)
Returns the invalidation callback function for a CFMachPort object.
Declaration
func CFMachPortGetInvalidationCallBack(_ port: CFMachPort!) -> CFMachPortInvalidationCallBack!Parameters
- port:
The CFMachPort object to examine.
Return Value
The callback function invoked when port is invalidated. NULL if no callback has been set with CFMachPortSetInvalidationCallBack(_:_:).