Indeed. And I was thinking that even though I am attempting to trap all signals that even the ones that can't be trapped will not be trapped with my code. I'm thinking that it doesn't hurt anything to trap those signals, though. Right?

The USR1 signal that I'm trapping is actually being trapped for a function purpose of my program that is not clearly obvious from my posted code but you're right, however, that there is no real reason to trap it either unless there is a specific reason. In my case, for this code, there is. :)

Now the CHLD signal you mention is a very interesting case that I didn't think about before. So, I will consider this in my existing code. Thank you!