C programs that can receive shutdown/termination requests from linux/upstart/ubuntu

I wrote a program for Linux in C. Currently I’m running Ubuntu Upstart as a background service.

I would like to be able to have the program close gracefully when it receives a command, rather than being killed. Can someone point to the function used to receive such commands?

(EDIT: can’t answer my own post, but it seems like I’m going to use the signal.h signaling function to put callbacks on SIGTERM and SIGKILL).

You want to use sigaction(2) to define a handler that runs when SIGTERM is captured.