By Warren W Gay

Complicated UNIX Programming is going past the basics of UNIX programming and offers details and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this ebook builds at the abilities and information the reader already possesses. It comprises insurance of net methods, interprocess keep an eye on, dossier method manipulation, synchronization, and masses extra.

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

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Pipes are now routinely used on the command line under UNIX for all sorts of purposes, using the | pipe (vertical bar) symbol. These are anonymous pipes, since they exist only between the processes that are communicating with each other. They disappear from the system when both ends of the pipe become closed. It is also possible to create a named pipe that exists in the file system. These are also known as FIFOs, since data that is written first in is first out of the pipe. The following shows a simple example: $ mkfifo myFIFO $ ls -l total 0 prwxr-xr-x 1 myid mygrp 0 Apr 15 16:55 myFIFO $ ls -l >myFIFO & $ tr '[a-z]''[A-Z]'myFIFO $ The example illustrates how the ls(1) command was able to redirect its output into the FIFO myFIFO (ls was placed into the background so that another command could be started in the same session).

Additionally, each block device within the system usually has a corresponding character device as well. Block and character devices are also referred to as block raw devices and character raw devices, respectively. When applied to a device, the word "raw" indicates that the disk space and structure are not managed. The raw device does not maintain a structure of files and directories within it. This is the job of file system software. Similarly, a database manages tables and rows within a raw device.

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. Here it is essential to test the return value from fclose(3) and then report the reason contained within errno immediately upon detecting the failure. Note ENOSPC means No Space Left On Device. This error code is returned when there is insufficient disk space to enlarge a file. It frequently happens when write(2) is called and the size of the file would have increased as a result of the call, but no free space remained.

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