Download PDF by Warren W Gay: Advanced UNIX Programming

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

Complex UNIX Programming is going past the basics of UNIX programming and provides info and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this booklet builds at the abilities and information the reader already possesses. It comprises assurance of net procedures, interprocess keep an eye on, dossier procedure manipulation, synchronization, and masses extra.

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Chapter 3 is another foundation-building chapter. Veterans can skip that chapter if they are in a hurry. If you are still building up your knowledge about UNIX programming, you will want to pay special attention to this chapter. It will help you master the material in the remainder of this book. Chapter 3. Error Handling and Reporting The UNIX operating system and its associated C libraries offer a rich set of system and function library calls, respectively. Within this set of calls there are very few functions, which cannot return an error.

Long filename support made it inconvenient to work directly with directory entries. The first point illustrates one of the big weaknesses of early directory management. It was possible to lose the contents of an entire directory by accidentally overwriting the directory. The following command used to create havoc: $ echo OOPS >directory If directory was the name of a directory, this command would overwrite its contents, causing UNIX to lose track of all the files that it managed. Even worse, it usually meant that the space occupied by the files in that directory was lost, since the file system was not notified of any deletion.

However, when it discovers that it lacks permissions to open file makefile, some implementations of the make(1) command report this as an error to the user. See the following Note for variations on this theme by the different UNIX platforms tested. Note The make(1) command's behavior varies on the different UNIX platforms tested. 3 The nature of a failure is clearly important to the programmer of any software or utility program. The error-reporting mechanism that early developers of UNIX chose was the special external integer variable named errno.

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Advanced UNIX Programming by Warren W Gay

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