pub unsafe extern "C" fn evbuffer_add_cb(
buffer: *mut evbuffer,
cb: evbuffer_cb_func,
cbarg: *mut c_void,
) -> *mut evbuffer_cb_entrypub unsafe extern "C" fn evbuffer_add_cb(
buffer: *mut evbuffer,
cb: evbuffer_cb_func,
cbarg: *mut c_void,
) -> *mut evbuffer_cb_entry