Specifies the type of function passed to glib.main_context.MainContext.setPollFunc. The semantics of the function should match those of the poll() system call.
the number of #GPollFD elements which have events or errors reported, or -1 if an error occurred.
Specifies the type of function passed to glib.main_context.MainContext.setPollFunc. The semantics of the function should match those of the poll() system call.