// SendCallback sends the netlink message. The specified callback function
// will be called for each message that is received in response.
func (m *Message) SendCallback(fn CallbackFunc, arg interface{}) error {
s, err := newSocket()
if err != nil {
return err
}
defer s.free()
if errno := C.genl_connect(s.nls); errno != 0 {
return &Error{errno, "failed to connect to netlink"}
}
defer C.nl_close(s.nls)
cbArg := &callbackArg{fn: fn, arg: arg}
cbID := registerCallback(cbArg)
defer unregisterCallback(cbArg)
if errno := C.nl_socket_modify_cb(s.nls, C.NL_CB_VALID, C.NL_CB_CUSTOM, (C.nl_recvmsg_msg_cb_t)(unsafe.Pointer(C.callbackGateway)), unsafe.Pointer(cbID)); errno != 0 {
return &Error{errno, "failed to modify callback"}
}
// nl_send_auto_complete returns number of bytes sent or a negative
// errno on failure.
if errno := C.nl_send_auto_complete(s.nls, m.nlm); errno < 0 {
return &Error{errno, "failed to send netlink message"}
}
if errno := C.nl_recvmsgs_default(s.nls); errno != 0 {
return &Error{errno, "failed to receive messages"}
}
return nil
}
// Family returns the family identifier for the specified family name.
func Family(name string) (int, error) {
s, err := newSocket()
if err != nil {
return -1, err
}
defer s.free()
if errno := C.genl_connect(s.nls); errno != 0 {
return -1, &Error{errno, "failed to connect to netlink"}
}
defer C.nl_close((*C.struct_nl_sock)(s.nls))
cn := C.CString(name)
defer C.free(unsafe.Pointer(cn))
family := C.genl_ctrl_resolve(s.nls, cn)
if family < 0 {
return -1, errors.New("failed to resolve family name")
}
return int(family), nil
}
