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http://blog.abyz.ir/1393/08/%d8%ba%d9%88%d8%a7%d8%b5%db%8c-%d8%af%d8%b1-%d8%a7%d8%b9%d9%85%d8%a7%d9%82-systemd-socket-activation/
غواصی در اعماق: systemd socket activation