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at this point I am just trying to learn basics of C,
so I started with manipulating strings, then send them over the internet. Then I forked it and now try to understand IPC next step I will try to...

Thanx all for your replays,
@ brewbuck
You are right. Its (with my level of knowledge) difficult to get it work properly.
I googled with your comment and expand my vocabulary with such words as...

I am learning programming in C,
I have multiple forked process running, now I want them to read/write data from/to one file.
My question is how can I do it safely? I am not sure if the one process...