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On Wed, Dec 26, 2012 at 4:01 PM, Sam Roberts <vieuxtech@gmail.com> wrote:

> IIRC, sethook can't be guaranteed sig-safe in an only-ANSI conformant
> system, but it is in on most operating systems, but maybe only if word
> size is >= 32?

I'm not sure how word size implies the same atomicity `volatile
sig_atomic_t' would in POSIX. In this respect, the OP is correct.