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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>::<span class="ident">null_mut</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">RawFd</span>;
<span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_int</span>, <span class="ident">timeval</span>};
<span class="kw">use</span> {<span class="ident">Errno</span>, <span class="prelude-ty">Result</span>};
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">time</span>::<span class="ident">TimeVal</span>;
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FD_SETSIZE</span>: <span class="ident">RawFd</span> <span class="op">=</span> <span class="number">1024</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FdSet</span> {
<span class="ident">bits</span>: [<span class="ident">i32</span>; <span class="ident">FD_SETSIZE</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">/</span> <span class="number">32</span>]
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>))]</span>
<span class="kw">const</span> <span class="ident">BITS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">32</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>)))]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FdSet</span> {
<span class="ident">bits</span>: [<span class="ident">u64</span>; <span class="ident">FD_SETSIZE</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">/</span> <span class="number">64</span>]
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>)))]</span>
<span class="kw">const</span> <span class="ident">BITS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">64</span>;
<span class="kw">impl</span> <span class="ident">FdSet</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">FdSet</span> {
<span class="ident">FdSet</span> {
<span class="ident">bits</span>: [<span class="number">0</span>; <span class="ident">FD_SETSIZE</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">/</span> <span class="ident">BITS</span>]
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fd</span>: <span class="ident">RawFd</span>) {
<span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">fd</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="self">self</span>.<span class="ident">bits</span>[<span class="ident">fd</span> <span class="op">/</span> <span class="ident">BITS</span>] <span class="op">|=</span> <span class="number">1</span> <span class="op">&lt;&lt;</span> (<span class="ident">fd</span> <span class="op">%</span> <span class="ident">BITS</span>);
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fd</span>: <span class="ident">RawFd</span>) {
<span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">fd</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="self">self</span>.<span class="ident">bits</span>[<span class="ident">fd</span> <span class="op">/</span> <span class="ident">BITS</span>] <span class="op">&amp;=</span> <span class="op">!</span>(<span class="number">1</span> <span class="op">&lt;&lt;</span> (<span class="ident">fd</span> <span class="op">%</span> <span class="ident">BITS</span>));
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
<span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">fd</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="self">self</span>.<span class="ident">bits</span>[<span class="ident">fd</span> <span class="op">/</span> <span class="ident">BITS</span>] <span class="op">&amp;</span> (<span class="number">1</span> <span class="op">&lt;&lt;</span> (<span class="ident">fd</span> <span class="op">%</span> <span class="ident">BITS</span>)) <span class="op">&gt;</span> <span class="number">0</span>
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">for</span> <span class="ident">bits</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">bits</span> {
<span class="kw-2">*</span><span class="ident">bits</span> <span class="op">=</span> <span class="number">0</span>
}
}
}
<span class="kw">mod</span> <span class="ident">ffi</span> {
<span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_int</span>, <span class="ident">timeval</span>};
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">FdSet</span>;
<span class="kw">extern</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">select</span>(<span class="ident">nfds</span>: <span class="ident">c_int</span>,
<span class="ident">readfds</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>,
<span class="ident">writefds</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>,
<span class="ident">errorfds</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>,
<span class="ident">timeout</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">timeval</span>) <span class="op">-&gt;</span> <span class="ident">c_int</span>;
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">select</span>(<span class="ident">nfds</span>: <span class="ident">c_int</span>,
<span class="ident">readfds</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">FdSet</span><span class="op">&gt;</span>,
<span class="ident">writefds</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">FdSet</span><span class="op">&gt;</span>,
<span class="ident">errorfds</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">FdSet</span><span class="op">&gt;</span>,
<span class="ident">timeout</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">TimeVal</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">c_int</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">readfds</span> <span class="op">=</span> <span class="ident">readfds</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">set</span><span class="op">|</span> <span class="ident">set</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>).<span class="ident">unwrap_or</span>(<span class="ident">null_mut</span>());
<span class="kw">let</span> <span class="ident">writefds</span> <span class="op">=</span> <span class="ident">writefds</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">set</span><span class="op">|</span> <span class="ident">set</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>).<span class="ident">unwrap_or</span>(<span class="ident">null_mut</span>());
<span class="kw">let</span> <span class="ident">errorfds</span> <span class="op">=</span> <span class="ident">errorfds</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">set</span><span class="op">|</span> <span class="ident">set</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">FdSet</span>).<span class="ident">unwrap_or</span>(<span class="ident">null_mut</span>());
<span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">timeout</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">tv</span><span class="op">|</span> <span class="ident">tv</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">TimeVal</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">timeval</span>)
.<span class="ident">unwrap_or</span>(<span class="ident">null_mut</span>());
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">ffi</span>::<span class="ident">select</span>(<span class="ident">nfds</span>, <span class="ident">readfds</span>, <span class="ident">writefds</span>, <span class="ident">errorfds</span>, <span class="ident">timeout</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)
}
</pre>
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