Function mupdf_sys::fz_warning_callback

pub unsafe extern "C" fn fz_warning_callback(
    ctx: *mut fz_context,
    user: *mut *mut c_void
) -> fz_warning_cb

Retrieve the currently set warning callback, or NULL if none has been set. Optionally, if user is non-NULL, the user pointer given when the warning callback was set is also passed back to the caller.