The open system call determines whether the mapping is readable or writable.

open系统调用确定映射是否可读或可写。

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This function is a high-level way of opening a file; but, since the only way to open a file in Linux is to use the open system call, fopen makes use of open in its implementation.

该函数是打开文件的高层次方式；但是，因为在Linux中打开文件的唯一方法是使用open系统调用，所以fopen在其实现中利用open 。

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At last, this paper will describe the procedure of acl control with an illustration of open system call.

本文最后将以Open系统调用为例说明ACL总体控制流程。

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