Services are typically controlled by a daemon, which is simply a background process running, listening for a client to request a specific service on a specific port.
服务通常由守护程序控制，简单来说守护程序就是一种正在运行的后台进程，侦听客户机对特定端口上的特定服务提出的请求。
Daemontools provides a daemon process called svscan that takes care of managing a collection of services.
daemontools提供了叫作svscan的守护进程，它负责管理服务集合。
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