Ok, folks--this is excellent feedback. So...

I've updated the page, and it was at the end of a long day, so I've probably introduced a raft of new errors and omissions. Now it's all sigaction() all the time, and there is hardly a mention of signal(). I included the async stuff and added sig_atomic_t info.

The complexity of sigaction() et al is pretty high compared to signal(), so I only gave it a glancing blow. I do agree with many posters that there is probably a better way than signals to do whatever it is you're doing. I don't think I've ever used them in real life other than to reap dead children or handle SIGINT. (Of course, people do--it just might not be that common.)