c_g_signal_new

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
guint function(gchar* signalName, GType itype, GSignalFlags signalFlags, guint classOffset, GSignalAccumulator accumulator, void* accuData, GSignalCMarshaller cMarshaller, GType returnType, guint nParams, ...) c_g_signal_new;

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