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

By Warren W Gay

Complex UNIX Programming is going past the basics of UNIX programming and provides info and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this booklet builds at the talents and data the reader already possesses. It comprises insurance of net approaches, interprocess regulate, dossier procedure manipulation, synchronization, and masses extra.

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

Sample text

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. Only a compile is required to reference the correct numeric value for these codes on a given platform. UNIX errno codes are non-zero values and usually start at 1 and work up. Zero is sometimes used to indicate "no error" (this convention is used in rare cases with the functions strtol(3), strtoul(3), and strtod(3), for example).

A failure during close Some programmers are surprised to realize that fclose(3) can fail in the example provided. This can happen because the data written by fwrite(3) is still contained in a buffer provided by the stream fptr. When fclose(3) is finally called, it is first necessary to force the unwritten data in the buffer out to disk before closing the underlying file descriptor. If the disk is full, the fclose(3) call will fail and errno will report the error as code ENOSPC. Note that in this scenario, ferror(3) cannot be used to test for an error because the FILE stream is destroyed by the fclose(3) call.

Over time, several problems with this open concept emerged: • • • Program errors or accidental writes to a directory could cause the loss of several files. New file systems supported different directory structure entries. 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.

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