Function gio_sys::g_io_stream_splice_async

pub unsafe extern "C" fn g_io_stream_splice_async(
    stream1: *mut GIOStream, 
    stream2: *mut GIOStream, 
    flags: GIOStreamSpliceFlags, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)