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</pre><pre class="rust ">
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">os</span>::<span class="kw-2">*</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;linux&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;android&quot;</span>))]</span>
<span class="kw">mod</span> <span class="ident">os</span> {
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">utsname</span>::<span class="ident">uname</span>;
<span class="comment">// Features:</span>
<span class="comment">// * atomic cloexec on socket: 2.6.27</span>
<span class="comment">// * pipe2: 2.6.27</span>
<span class="comment">// * accept4: 2.6.28</span>
<span class="kw">static</span> <span class="ident">VERS_UNKNOWN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">static</span> <span class="ident">VERS_2_6_18</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">2</span>;
<span class="kw">static</span> <span class="ident">VERS_2_6_27</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">3</span>;
<span class="kw">static</span> <span class="ident">VERS_2_6_28</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">4</span>;
<span class="kw">static</span> <span class="ident">VERS_3</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">5</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">digit</span>(<span class="ident">dst</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">u8</span>) {
<span class="kw-2">*</span><span class="ident">dst</span> <span class="op">*=</span> <span class="number">10</span>;
<span class="kw-2">*</span><span class="ident">dst</span> <span class="op">+=</span> (<span class="ident">b</span> <span class="op">-</span> <span class="string">b&#39;0&#39;</span>) <span class="kw">as</span> <span class="ident">usize</span>;
}
<span class="kw">fn</span> <span class="ident">parse_kernel_version</span>() <span class="op">-&gt;</span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="ident">uname</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">curr</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">major</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">minor</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">patch</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">u</span>.<span class="ident">release</span>().<span class="ident">bytes</span>() {
<span class="kw">if</span> <span class="ident">curr</span> <span class="op">&gt;=</span> <span class="number">3</span> {
<span class="kw">break</span>;
}
<span class="kw">match</span> <span class="ident">b</span> {
<span class="string">b&#39;.&#39;</span> <span class="op">|</span> <span class="string">b&#39;-&#39;</span> <span class="op">=&gt;</span> {
<span class="ident">curr</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="string">b&#39;0&#39;</span>...<span class="string">b&#39;9&#39;</span> <span class="op">=&gt;</span> {
<span class="kw">match</span> <span class="ident">curr</span> {
<span class="number">0</span> <span class="op">=&gt;</span> <span class="ident">digit</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">major</span>, <span class="ident">b</span>),
<span class="number">1</span> <span class="op">=&gt;</span> <span class="ident">digit</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">minor</span>, <span class="ident">b</span>),
_ <span class="op">=&gt;</span> <span class="ident">digit</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">patch</span>, <span class="ident">b</span>),
}
}
_ <span class="op">=&gt;</span> <span class="kw">break</span>,
}
}
<span class="kw">if</span> <span class="ident">major</span> <span class="op">&gt;=</span> <span class="number">3</span> {
<span class="ident">VERS_3</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">major</span> <span class="op">&gt;=</span> <span class="number">2</span> {
<span class="kw">if</span> <span class="ident">minor</span> <span class="op">&gt;=</span> <span class="number">7</span> {
<span class="ident">VERS_UNKNOWN</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">minor</span> <span class="op">&gt;=</span> <span class="number">6</span> {
<span class="kw">if</span> <span class="ident">patch</span> <span class="op">&gt;=</span> <span class="number">28</span> {
<span class="ident">VERS_2_6_28</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">patch</span> <span class="op">&gt;=</span> <span class="number">27</span> {
<span class="ident">VERS_2_6_27</span>
} <span class="kw">else</span> {
<span class="ident">VERS_2_6_18</span>
}
} <span class="kw">else</span> {
<span class="ident">VERS_UNKNOWN</span>
}
} <span class="kw">else</span> {
<span class="ident">VERS_UNKNOWN</span>
}
}
<span class="kw">fn</span> <span class="ident">kernel_version</span>() <span class="op">-&gt;</span> <span class="ident">usize</span> {
<span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">KERNEL_VERS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="ident">KERNEL_VERS</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">KERNEL_VERS</span> <span class="op">=</span> <span class="ident">parse_kernel_version</span>();
}
<span class="ident">KERNEL_VERS</span>
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">socket_atomic_cloexec</span>() <span class="op">-&gt;</span> <span class="ident">bool</span> {
<span class="ident">kernel_version</span>() <span class="op">&gt;=</span> <span class="ident">VERS_2_6_27</span>
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">test_parsing_kernel_version</span>() {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">kernel_version</span>() <span class="op">&gt;</span> <span class="number">0</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;freebsd&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;dragonfly&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;openbsd&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;netbsd&quot;</span>))]</span>
<span class="kw">mod</span> <span class="ident">os</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">socket_atomic_cloexec</span>() <span class="op">-&gt;</span> <span class="ident">bool</span> {
<span class="bool-val">false</span>
}
}
</pre>
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