Struct tokio::net::UdpSocket

pub struct UdpSocket { /* fields omitted */ }

An I/O object representing a UDP socket.

Methods

impl UdpSocket

fn bind(addr: &SocketAddr) -> Result<UdpSocket>

This function will create a new UDP socket and attempt to bind it to the addr provided.

fn from_std(socket: UdpSocket, handle: &Handle) -> Result<UdpSocket>

Creates a new UdpSocket from the previously bound socket provided.

The socket given will be registered with the event loop that handle is associated with. This function requires that socket has previously been bound to an address to work correctly.

This can be used in conjunction with net2's UdpBuilder interface to configure a socket before it's handed off, such as setting options like reuse_address or binding to multiple addresses.

fn local_addr(&self) -> Result<SocketAddr>

Returns the local address that this socket is bound to.

fn connect(&self, addr: &SocketAddr) -> Result<()>

Connects the UDP socket setting the default destination for send() and limiting packets that are read via recv from the address specified in addr.

fn send(&mut self, buf: &[u8]) -> Result<usize>

Sends data on the socket to the address previously bound via connect(). On success, returns the number of bytes written.

Panics

This function will panic if called outside the context of a future's task.

fn recv(&mut self, buf: &mut [u8]) -> Result<usize>

Receives data from the socket previously bound with connect(). On success, returns the number of bytes read.

Panics

This function will panic if called outside the context of a future's task.

fn send_to(&mut self, buf: &[u8], target: &SocketAddr) -> Result<usize>

Sends data on the socket to the given address. On success, returns the number of bytes written.

Address type can be any implementer of ToSocketAddrs trait. See its documentation for concrete examples.

Panics

This function will panic if called outside the context of a future's task.

fn send_dgram<T>(self, buf: T, addr: &SocketAddr) -> SendDgram<T> where
    T: AsRef<[u8]>, 

Creates a future that will write the entire contents of the buffer buf provided as a datagram to this socket.

The returned future will return after data has been written to the outbound socket. The future will resolve to the stream as well as the buffer (for reuse if needed).

Any error which happens during writing will cause both the stream and the buffer to get destroyed. Note that failure to write the entire buffer is considered an error for the purposes of sending a datagram.

The buf parameter here only requires the AsRef<[u8]> trait, which should be broadly applicable to accepting data which can be converted to a slice.

fn recv_from(&mut self, buf: &mut [u8]) -> Result<(usize, SocketAddr)>

Receives data from the socket. On success, returns the number of bytes read and the address from whence the data came.

Panics

This function will panic if called outside the context of a future's task.

fn recv_dgram<T>(self, buf: T) -> RecvDgram<T> where
    T: AsMut<[u8]>, 

Creates a future that receive a datagram to be written to the buffer provided.

The returned future will return after a datagram has been received on this socket. The future will resolve to the socket, the buffer, the amount of data read, and the address the data was received from.

An error during reading will cause the socket and buffer to get destroyed.

The buf parameter here only requires the AsMut<[u8]> trait, which should be broadly applicable to accepting data which can be converted to a slice.

fn broadcast(&self) -> Result<bool>

Gets the value of the SO_BROADCAST option for this socket.

For more information about this option, see set_broadcast.

fn set_broadcast(&self, on: bool) -> Result<()>

Sets the value of the SO_BROADCAST option for this socket.

When enabled, this socket is allowed to send packets to a broadcast address.

fn multicast_loop_v4(&self) -> Result<bool>

Gets the value of the IP_MULTICAST_LOOP option for this socket.

For more information about this option, see set_multicast_loop_v4.

fn set_multicast_loop_v4(&self, on: bool) -> Result<()>

Sets the value of the IP_MULTICAST_LOOP option for this socket.

If enabled, multicast packets will be looped back to the local socket.

Note

This may not have any affect on IPv6 sockets.

fn multicast_ttl_v4(&self) -> Result<u32>

Gets the value of the IP_MULTICAST_TTL option for this socket.

For more information about this option, see set_multicast_ttl_v4.

fn set_multicast_ttl_v4(&self, ttl: u32) -> Result<()>

Sets the value of the IP_MULTICAST_TTL option for this socket.

Indicates the time-to-live value of outgoing multicast packets for this socket. The default value is 1 which means that multicast packets don't leave the local network unless explicitly requested.

Note

This may not have any affect on IPv6 sockets.

fn multicast_loop_v6(&self) -> Result<bool>

Gets the value of the IPV6_MULTICAST_LOOP option for this socket.

For more information about this option, see set_multicast_loop_v6.

fn set_multicast_loop_v6(&self, on: bool) -> Result<()>

Sets the value of the IPV6_MULTICAST_LOOP option for this socket.

Controls whether this socket sees the multicast packets it sends itself.

Note

This may not have any affect on IPv4 sockets.

fn ttl(&self) -> Result<u32>

Gets the value of the IP_TTL option for this socket.

For more information about this option, see set_ttl.

fn set_ttl(&self, ttl: u32) -> Result<()>

Sets the value for the IP_TTL option on this socket.

This value sets the time-to-live field that is used in every packet sent from this socket.

fn join_multicast_v4(
    &self,
    multiaddr: &Ipv4Addr,
    interface: &Ipv4Addr
) -> Result<()>

Executes an operation of the IP_ADD_MEMBERSHIP type.

This function specifies a new multicast group for this socket to join. The address must be a valid multicast address, and interface is the address of the local interface with which the system should join the multicast group. If it's equal to INADDR_ANY then an appropriate interface is chosen by the system.

fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> Result<()>

Executes an operation of the IPV6_ADD_MEMBERSHIP type.

This function specifies a new multicast group for this socket to join. The address must be a valid multicast address, and interface is the index of the interface to join/leave (or 0 to indicate any interface).

fn leave_multicast_v4(
    &self,
    multiaddr: &Ipv4Addr,
    interface: &Ipv4Addr
) -> Result<()>

Executes an operation of the IP_DROP_MEMBERSHIP type.

For more information about this option, see join_multicast_v4.

fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> Result<()>

Executes an operation of the IPV6_DROP_MEMBERSHIP type.

For more information about this option, see join_multicast_v6.

Trait Implementations

impl Debug for UdpSocket

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.