Once you fork, each process has its own copy of variables. The easy way to remember that is that a fork creates a new copy of the running parent. In most process models (most notably UNIX) no process can access another's data without explicitly setting up a mechanism to do that. The two common choices are to use threads instead of forking; or to set up some sort of interprocess communication (IPC) between the two processes.

In reply to Re: Child reading from Parent by steves
in thread Child reading from Parent by icius

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