其中最奇妙的事情之一是，在几乎每个平台上都为计划要处理的每个库函数和系统调用都提供自己的声明，而不是包括标准的头文件。

One of these magics was, on nearly every platform, to provide its own declarations for every library function and system call it planned to use, rather than including the standard headers.

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它演示了对一些系统调用和c库函数的适当使用，其中包括fopen、fclose、access、setvbuf、perror、strerror和popen。

It shows appropriate use of some system calls and library functions from c, including fopen, fclose, access, setvbuf, perror, strerror, and popen.

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