Function gio_sys::g_pollable_stream_read

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