Re: math_error.7 draft 4, for review

[Andreas Jaeger <aj-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org>]

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"Michael Kerrisk" <mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> writes:

> Well, for example, according to my tests, cos(3) does not set errno.
> Is that what you would have expected?

No, I wouldn't.  And double checking, it's the other way round :-(.  We
test the exception handling, not the error handling, so tests like
(libc/math/libm-test.inc) these

  TEST_f_f (cos, plus_infty, nan_value, INVALID_EXCEPTION);
  TEST_f_f (cos, minus_infty, nan_value, INVALID_EXCEPTION);

test that cos with input plus/minus infinity returns a NaN and raises
and invalid exception which is tested with fetestexcept.  And if you
have different results, please tell me,

Andreas
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