Function gio_sys::g_pollable_input_stream_read_nonblocking

pub unsafe extern "C" fn g_pollable_input_stream_read_nonblocking(
    stream: *mut GPollableInputStream, 
    buffer: *mut u8, 
    count: size_t, 
    cancellable: *mut GCancellable, 
    error: *mut *mut GError
) -> ssize_t