9b9b38bf89
Motivation: If SO_LINGER is set to 0 the EPOLL transport will send a FIN followed by a RST. This is not consistent with the behavior of the NIO transport. This variation in behavior can cause protocol violations in streaming protocols (e.g. HTTP) where a FIN may be interpreted as a valid end to a data stream, but RST may be treated as the data is corrupted and should be discarded. https://github.com/netty/netty/issues/4170 Claims the behavior of NIO always issues a shutdown when close occurs. I could not find any evidence of this in Netty's NIO transport nor in the JDK's SocketChannel.close() implementation. Modifications: - AbstractEpollChannel should be consistent with the NIO transport and not force a shutdown on every close - FileDescriptor to keep state in a consistent manner with the JDK and not allow a shutdown after a close - Unit tests for NIO and EPOLL to ensure consistent behavior Result: EPOLL is capable of sending just a RST to terminate a connection. |
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