Mask indicating which of signal_id, detail, closure, func and/or data the handler has to match.
Signal the handler has to be connected to.
Signal detail the handler has to be connected to.
The closure the handler will invoke.
The C closure callback of the handler (useless for non-C closures).
The closure data of the handler's closure.
A valid non-0 signal handler id for a successful match.
Finds the first signal handler that matches certain selection criteria. The criteria mask is passed as an OR-ed combination of GSignalMatchType flags, and the criteria values are passed as arguments. The match mask has to be non-0 for successful matches. If no handler was found, 0 is returned.