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All sockets are created with SO_REUSEADDR, it's needed for restoring. E.g.: A listen socket is created after a connected socket. Both of them are binded to one port. So SO_REUSEADDR should be restored, when all sockets on a port were created. This code creates a structure for each port of one type of sockets and accounts a number of sockets, which are not restored yet. Sockets have a hook post_open(), in which it waits when all sockets for a defined port would be created and then it will restore SO_REUSEADDR. struct port contains a type (udp, tcp, etc) and a port number. It doesn't contain family or addr, because it's extra loads of logic, which doesn't bring a significant profits. v2: fix according with comments from Pavel Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>