// Submit accept request.
	o.handle = s
	o.rsan = int32(unsafe.Sizeof(rawsa[0]))
	_, err := execIO(o, func(o *operation) error {
		return AcceptFunc(o.fd.Sysfd, o.handle, (*byte)(unsafe.Pointer(&rawsa[0])), 0, uint32(o.rsan), uint32(o.rsan), &o.qty, &o.o)
	})
	if err != nil {
		CloseFunc(s)
		return "acceptex", err
	}