What is the difference between sigaction and signal?

Question

I was about to add an extra signal handler to an app we have here and I noticed that the author had used sigaction() to set up the other signal handlers. I was

Answer 1

From the signal(3) man page:

DESCRIPTION

 This signal() facility is a simplified interface to the more
 general sigaction(2) facility.

Both invoke the same underlying facility. You should presumably not manipulate the response the a single signal with both, but mixing them shouldn't cause anything to break...