The system call interface can be described from two perspectives.
系统调用接口可以从两个角度进行描述。
Most frequently, such calls are made indirectly, though a system call interface.
通常,这种调用通过系统调用接口间接完成。
At the top is the system call interface, which implements the basic functions such as read and write.
最上面是系统调用接口,它实现了一些基本的功能,例如read和write。
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