Download Advanced UNIX Programming (Sams White Book Series) by Warren W Gay PDF

By Warren W Gay

Complicated UNIX Programming is going past the basics of UNIX programming and offers info and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this publication builds at the abilities and information the reader already possesses. It comprises assurance of net tactics, interprocess keep an eye on, dossier process manipulation, synchronization, and lots more and plenty extra.

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Additional info for Advanced UNIX Programming (Sams White Book Series)

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Note ENOENT means No Such File or Directory. This error code indicates that the requested file system object was not found (does not exist). Referencing Error Codes by Name Using the errno external variable convention for errors required that a series of error codes be agreed on in advance. 4, 35 for HPUX, and 42 for Linux). The symbolic macro names can be used to refer to the same error codes on different UNIX platforms. h. h> Using symbolic macro references for error codes is important, since it allows your C programs to be portable to other UNIX platforms.

Whenever a function call returned a failure indication, it would first assign a reason code for the failure to the external errno variable. The calling program could then examine this external variable if it cared to know the reason for the failure. When the function returned a successful indication (or "no information" indication), the value of errno was left unchanged. This mechanism was suitable for early versions of UNIX. However, this older method has limitations. To remove the inherent limitations of the errno variable, its definition has changed somewhat in modern versions of UNIX.

Another problem that often occurs is this: What if the error code is not coming from errno but some other variable? The perror(3) function seems best left to academic examples because of its simplicity. Using the sys_errlist[] Array If you look up the perror(3) function in the FreeBSD man(1) pages (and on most UNIX platforms), you will also see that it describes the sys_errlist[] array. 5 */ The sys_errlist[] array is an external array of pointers to string constants. Each string describes a particular error that corresponds to an errno code.

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