You perform three basic steps to add a new system call to the kernel

向内核中添加新系统调用，需要执行3 个基本步骤

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The list is copied into the kernel space for each call.

对于每个调用，都要把这个列表复制到内核空间中。

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Each system call is multiplexed into the kernel through a single entry point.

每个系统调用都是通过一个单一的入口点多路传入内核。

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Each system call is multiplexed into the kernel through a single entry point.

每个系统调用都是通过一个单一的入口点多路传入内核。

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