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POWhat is a pipe and fork in C++
 

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  1. POWhat is a pipe and fork in C++
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    <p>I recently stumbled across something called pipe (all small letters) and fork (also all small letters). Apparently pipe "is a method of connecting the standard output of one process to the standard input of another". What I do not understand is what does standard input output of a process mean here. I already know that functions can call other functions and use the values returned by them so what is special about pipe, why do we need pipes? I have never come across these in my C/C++ books, what mystery is this? A simple way to communicate between two applications (I am not using the word process here) is that one application creates a file, calls another application and let it open this file and process its data and create a new result file and than terminate itself. Than the original application can continue processing and read from the result file and delete the file it created first. This is a simple way for two applications to communicate, I think that in the age of .Net framworks and complex operating systems, this must be even easier right?</p> <p>Also, what is a fork? is it something specific to C++? I remember reading somewhere on internet that by using fork we can open another application from out C++ application. However, I do not know of the limitations and implications of this approach and any drawbacks that it may have. Why do we need fork? What does it do?</p> <p>I do not wish that anyone has to write several pages of information. I just wish to understand what these things are, what do they do, why do we need them, and how come my C/C++ book did not cover these two?</p>
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    1. COLook here http://en.wikipedia.org/wiki/Standard_streams and here http://en.wikipedia.org/wiki/Pipeline_%28Unix%29 for example. There may also be some confusion between what's part of a C program and what's provided by the OS.
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