Question: The problem with the program is that the signal handler ( sig _ chld ) isn't designed to handle being interrupted by another instance of

The problem with the program is that the signal handler (sig_chld) isn't designed to handle being interrupted by another instance of itself. When a signal arrives while sig_chld is already running, the new instance interrupts the ongoing one. If this happens in the parent process, it could mess up the shared variable (counter) that both instances are trying to modify.

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