@Override
public DatagramChannel bind(SocketAddress local) throws IOException {
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpen();
if (localAddress != null) throw new AlreadyBoundException();
InetSocketAddress isa;
if (local == null) {
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
isa = new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
} else {
isa = new InetSocketAddress(0);
}
} else {
isa = Net.checkAddress(local);
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
InetAddress addr = isa.getAddress();
if (!(addr instanceof Inet4Address)) throw new UnsupportedAddressTypeException();
}
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkListen(isa.getPort());
}
Net.bind(family, fd, isa.getAddress(), isa.getPort());
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
/**
* Binds this DatagramSocket to a specific address & port.
*
* <p>If the address is <code>null</code>, then the system will pick up an ephemeral port and a
* valid local address to bind the socket.
*
* <p>
*
* @param addr The address & port to bind to.
* @throws SocketException if any error happens during the bind, or if the socket is already
* bound.
* @throws SecurityException if a security manager exists and its <code>checkListen</code> method
* doesn't allow the operation.
* @throws IllegalArgumentException if addr is a SocketAddress subclass not supported by this
* socket.
* @since 1.4
*/
public synchronized void bind(SocketAddress addr) throws SocketException {
if (isClosed()) throw new SocketException("Socket is closed");
if (isBound()) throw new SocketException("already bound");
if (addr == null) addr = new InetSocketAddress(0);
if (!(addr instanceof InetSocketAddress))
throw new IllegalArgumentException("Unsupported address type!");
InetSocketAddress epoint = (InetSocketAddress) addr;
if (epoint.isUnresolved()) throw new SocketException("Unresolved address");
SecurityManager sec = System.getSecurityManager();
if (sec != null) {
sec.checkListen(epoint.getPort());
}
try {
getImpl().bind(epoint.getPort(), epoint.getAddress());
} catch (SocketException e) {
getImpl().close();
throw e;
}
bound = true;
}
@Override
public void checkListen(final int pPort) {
if (finalSecurityManager != null) finalSecurityManager.checkListen(pPort);
}
@Override
public void checkListen(final int port) {
if (securityManager != null) securityManager.checkListen(port);
}
