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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_char</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::<span class="ident">CStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">from_utf8_unchecked</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="kw">use</span> <span class="kw">super</span>::<span class="ident">UtsName</span>;
<span class="kw">extern</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uname</span>(<span class="ident">buf</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">UtsName</span>) <span class="op">-&gt;</span> <span class="ident">c_int</span>;
}
}
<span class="kw">const</span> <span class="ident">UTSNAME_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">65</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">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UtsName</span> {
<span class="ident">sysname</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>],
<span class="ident">nodename</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>],
<span class="ident">release</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>],
<span class="ident">version</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>],
<span class="ident">machine</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>],
<span class="comment">// ifdef _GNU_SOURCE</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="ident">domainname</span>: [<span class="ident">c_char</span>; <span class="ident">UTSNAME_LEN</span>]
}
<span class="comment">// workaround for `derive(Clone)` not working for fixed-length arrays</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">UtsName</span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">UtsName</span> { <span class="kw-2">*</span><span class="self">self</span> } }
<span class="kw">impl</span> <span class="ident">UtsName</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sysname</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="ident">to_str</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">sysname</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> ) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nodename</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="ident">to_str</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">nodename</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> ) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">release</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="ident">to_str</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">release</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> ) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">version</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="ident">to_str</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">version</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> ) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">machine</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="ident">to_str</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">machine</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> ) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>)
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uname</span>() <span class="op">-&gt;</span> <span class="ident">UtsName</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span>: <span class="ident">UtsName</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="ident">ffi</span>::<span class="ident">uname</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">ret</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">UtsName</span>);
<span class="ident">ret</span>
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">to_str</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="ident">s</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">CStr</span>::<span class="ident">from_ptr</span>(<span class="kw-2">*</span><span class="ident">s</span>).<span class="ident">to_bytes</span>();
<span class="ident">from_utf8_unchecked</span>(<span class="ident">res</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">uname</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">test_uname</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">uname</span>().<span class="ident">sysname</span>(), <span class="string">&quot;Linux&quot;</span>);
}
}
</pre>
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