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- <h2 class="chapter">4 Reentrancy Properties of <code>libm</code></h2>
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- <p>When a libm function detects an exceptional case, <code>errno</code> may be
- set.
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- <p><code>errno</code> is a macro which expands to the per-thread error value.
- This makes it thread safe, and therefore reentrant.
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