What is correct way to have single Signal Handler function for multiple Signals?

Question

What is the best way in C on Linux for setting up a program that can handle multiple POSIX-signals with the same function?

For example in my code I have a handler fu

Answer 1

"signum" parameter of "sigaction" system call is an integer value, which does not work as a flag.

As far as I know, there's no way to assign one handler function for several signals in one call.