closeSync abstract method
void closeSync(Closes the RawSynchronousSocket.
Once closeSync has been called, attempting to call readSync, readIntoSync, writeFromSync, remoteAddress, and remotePort will cause a SocketException to be thrown.
Source
void closeSync();
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https://api.dartlang.org/stable/1.24.3/dart-io/RawSynchronousSocket/closeSync.html