valid file descriptors that can be closed are >= 0
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@ -42,7 +42,7 @@ TcpConnection::~TcpConnection() noexcept
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// remain open (tcp connection is forcefully closed). since we assume the handler is in scope for
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// the complete lifetime of the tcpconnection, we make one last call to notify it to unmonitor
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// the file descriptor.
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if (fileno() > 0) _handler->monitor(this, fileno(), 0);
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if (fileno() >= 0) _handler->monitor(this, fileno(), 0);
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// When the object is destructed, the _state-pointer will also destruct, resulting
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// in some final calls back to us to inform that the connection has indeed been closed.
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