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Originally Posted by Sary

yeah I know about the GCC thing ..
but what about the "signum" signal ? what is its role ?
as I see from the most important line u posted .. is that u kill a process by sending a signal to that process via its ID .. is that the whole idea ?

In addition dude .. did u say before that communication via pipes is the same as communication via tubes ?!

Thanks a lot for what you have provided up till now ..

You're asking about signum, but I told you to look at this page to know what is it. It is basically a signal type. For more reference read here.
And yes, pipes are "tubes". Do you have other definition for tubes?