[PATCH 4/4] manual/setjmp.texi: Clarify setcontext and signal handlers text

[Andreas Schwab]

Will Newton <will.newton@linaro.org> writes:

> Calling setcontext from a signal handler can be done safely so
> it is sufficient to note that it is not recommended.
>
> Also mention in setcontext documentation that restoring a context
> created by a call to a signal handler is undefined.

Unspecified and undefined are different concepts.  Unspecified means
that the input is still valid, and the implementation must react in a
defined way, but the standard doesn't say how.  Undefined means that the
input is invalid, and the result is unpredictable.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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