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fix: sockets are not signed int on Windows
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@@ -271,7 +271,7 @@ int zmq::tcp_connecter_t::open ()
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s = open_socket (tcp_addr->family (), SOCK_STREAM, IPPROTO_TCP);
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// IPv6 address family not supported, try automatic downgrade to IPv4.
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if (s == -1 && tcp_addr->family () == AF_INET6
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if (s == zmq::retired_fd && tcp_addr->family () == AF_INET6
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&& errno == EAFNOSUPPORT
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&& options.ipv6) {
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rc = addr->resolved.tcp_addr->resolve (
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