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daemon 进程的创建

💡 原文中文，约400字，阅读约需1分钟。

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内容提要

将当前目录更改为根目录，调用setsid切断与控制终端的关系，并使用umask(0)设置文件创建掩码为0，以确保daemon进程的文件权限独立于父进程的shell。

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