the log domain, or NULL for the default "" application domain
the log levels to apply the log handler for. To handle fatal and recursive messages as well, combine the log levels with the flagsGLib.LogLevelFlags.FLAG_FATAL and flagsGLib.LogLevelFlags.FLAG_RECURSION bit flags.
the log handler function
the ID of the new handler
Like funcGLib.log_set_handler, but takes a destroy notify for the user_data.
This has no effect if structured logging is enabled; see Using Structured Logging.