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I’m currently passing the pid on the command line to the child, but is there a way to do this in the Win32 API? Alternatively, can someone alleviate my fear that the pid I’m passing might belong to another process after some time if the parent has died?
Notice that if the parent process terminates it is very possible and even likely that the PID will be reused for another process. This is standard windows operation.
So to be sure, once you receive the id of the parent and are sure it is really your parent you should open a handle to it and use that.