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rswindell authored
This resolves the issue where if an external program closes the client_socket_dup, the passthru_thread can't write to the passthru_socket, so it terminates itself - by definition, deactivating the passthru_socket, but it didn't clear passthru_socket_active, so the input_thread would keep trying to write to it rather than sending the input from the user to the BBS. Also, terminate the passthru_thread (without any special log message) when sbbs->online is non-zero. Also overhauled a lot of the passthru-related log messages. Passthru ain't just for SSH anymore.
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