10.22. Summary

Signals are used in most nontrivial applications. An understanding of the hows and whys of signal handling is essential to advanced UNIX System programming. This chapter has been a long and thorough look at UNIX System signals. We started by looking at the warts in previous implementations of signals and how they manifest themselves. We then proceeded to the POSIX.1 reliable-signal concept and all the related functions. Once we covered all these details, we were able to provide implementations of the POSIX.1 abort, system, and sleep functions. We finished with a look at the job-control signals and the ways that we can convert between signal names and signal numbers.