It covers the basics of Portable operating system Interface (POSIX), real-time operating systems, and Pointers for real-time analysis.

它涵盖了可移植操作系统接口(POSIX)、实时操作系统的基础知识，以及一些实时分析技巧。

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POSIX services are available at run time through the libpthread.so dynamic library and underlying Linux kernel support.

可在运行时通过libpthread . so动态库和底层Linux核心支持获取POSIX服务。

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GNU sed is popular not only because its sources are freely distributable, but because it happens to have a lot of handy, time-saving extensions to the POSIX sed standard.

GNU sed之所以流行不仅因为可以自由分发其源代码，还因为它恰巧有许多对POSIX sed标准便利、省时的扩展。

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