Riddle me on this one

[D. Hugh Redelmeier]

| From: William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>

| Hmm... as one who likes to do a lot in signal handler (simply because
| it's nicely separated from main program), how much is too much?

I've simplified this in my mind, and I'm too lazy to look it up, but roughly:

- no library routines can be safely called because none is guaranteed
  to be re-entrant.  I seem to remember that longjmp and __exit might
  be exceptions.  Oh, and signalaction, I guess.

- if a variable is shared between a signal handler and any other code,
  it must be declared volatile and its type must be atomic_t.

That leaves very little that you can do safely.
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