mkdir系统调用用来创建这个上下文，用户进程然后可以打开这个目录中相关的文件。
The mkdir system call creates the context, and the user process can subsequently open the associated files inside that directory.
mkdir系统调用用来创建这个上下文，用户进程然后可以打开这个目录中相关的文件。
The mkdir system call creates the context, and the user process can subsequently open the associated files inside that directory.
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