Unix系统调用的扩展

Extension of Unix System Calls

扩展Ｕｎｉｘ的系统调用是系统软件开发及操作系统改造经常采用的措施，本文以ＵｎｉｘＳＶＲ３．２为例，讨论Ｕｎｉｘ系统调用的扩展方法，尤其是在缺少系统调用库源代码时，增添系统调用的方法。

Extending Unix operating system calls is a popmethod used in developing system software and remaking the Unix operating system. This paper discusses file extension method, especially the methodadding new system calls to the system when systemcall base source codes are lacked.