signalQuery
Queries the signal system for in-depth information about a specific signal. This function will fill in a user-provided structure to hold signal-specific information. If an invalid signal id is passed in, the @signal_id member of the #GSignalQuery is 0. All members filled into the #GSignalQuery structure should be considered constant and have to be left untouched.
Parameters
signalId
The signal id of the signal to query information for.
query
A user provided structure that is filled in with constant values upon success.