For courses in Unix Systems Programming, Unix System Administration, and as a supplemental text for courses in Advanced Networks and Systems Programming. This readable and comprehensive text clearly explains Unix programming and structure by addressing the solid fundamentals of Unix and providing different solutions to problems. All ideas and principles are introduced in the context of a practical problem, and excellent use is made of illustrations and listings in the text. Projects are solved by the development of complete programs, which are clearly commented on and integrated with explanations in the text.
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实际上程序会立刻退出,而不执行重置驱动程序的代码。当返回shell显示提示符并从用户处获得命令行时,终端仍旧处于非阻塞模式。shell调用read获取命令行,但是因为处于非阻塞状态,read立即返回0。总之,程序结束时文件描述符处于一个错误的状态。
与普通文件一样,目录也有特殊属性位,其中包含set-user-ID和set-group-ID位,使set-user-ID有效对目录有什么影响?如果有,那是什么?为什么?如果没有影响,那么你能想象出这些位有什么作用吗?
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