In this chapter, the reader has been taken through some advanced details with regard to signaling: how to handle crashing processes via appropriate fatal signal trapping, and once in the handler, getting key details including CPU registers, and so on. This was done by learning to interpret the powerful siginfo_t data structure. Further, handling races when working with the errno variable, and learning how to sleep correctly was covered.
Real time signals and their differences from regular Unix signals was covered; then, there was a section regarding the different means of sending signals to other processes. Finally, we looked at signal handling by synchronously blocking upon a given set of signals (using various APIs).
In the next Chapter 13, Timers, we shall make use of the knowledge we gained here (and in the preceding) Chapter 11, Signaling - Part I, and learn how...