31a3a06828
Solution: setsockopt returns EINVAL if the connection was closed by the peer after the accept returned a valid socket. This is a valid network error and should not cause an assert. To handle this we have to extract the setsockopt from the stream engine, as there's no clean way to return an error from the constructor. Instead, try to set this option before creating the engine in the callers, and return immediately as if the accept had failed to avoid churn. Do the same for the connect calls by setting the option in open_socket, so that the option for that case is set even before connecting, so there's no possible race condition. Since this has to be done in 4 places (tcp/ipc listener, socks connecter and open_socket) add an utility function in ip.cpp. Fixes #1442
ZeroMQ
Welcome
The ZeroMQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. ZeroMQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.
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