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1·Because when then forked process exit, it will close the connection it copied, which is the same connection its parent process is using, this may interrupt the parent process.

因为当时的分叉进程退出，它将关闭它的复制连接，这是相同的连接它的父进程正在使用，这可能会中断进程的父进程。

2·3 what's happen with the connection when the forked process ends? Should I close it? Or does it close automatically? And what's append to the father's process connection?

3什么是发生在连接时的分叉过程结束？我要关闭它？还是自动关闭？什么是追加到父的过程连接？