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In my program, I fork() several times depending on user input.
In certain instances, I want to handle SIGCHLD and say something like ‘Process # Finished’. In other cases though, I want to ignore this signal.
How can I do this?
Signal handling is set up globally for the process. If you want to catch an asynchronous signal like SIGCHLD when some children terminate but not others, you can’t decide to ignore it for some in advance.
You will need to handle the signal every time in the parent, then decide whether you want to ignore it in your handler.
At minimum, your handler should do a wait() on the child (si_pid in the siginfo_t structure) to harvest its return code. At that point you can check the process id and decide what else to do. You don’t have to print anything if you don’t want to.