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</pre><pre class="rust ">
<span class="comment">// Silence invalid warnings due to rust-lang/rust#16719</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">improper_ctypes</span>)]</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">libc</span>::{<span class="self">self</span>, <span class="ident">c_int</span>, <span class="ident">c_void</span>, <span class="ident">size_t</span>, <span class="ident">off_t</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</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">pub</span> <span class="kw">fn</span> <span class="ident">writev</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">iov</span>: <span class="kw-2">&amp;</span>[<span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span>[<span class="ident">u8</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">usize</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">writev</span>(<span class="ident">fd</span>, <span class="ident">iov</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">iovec</span>, <span class="ident">iov</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>) };
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">readv</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">iov</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</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">usize</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">readv</span>(<span class="ident">fd</span>, <span class="ident">iov</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">iovec</span>, <span class="ident">iov</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>) };
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;preadv_pwritev&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pwritev</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">iov</span>: <span class="kw-2">&amp;</span>[<span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span>],
<span class="ident">offset</span>: <span class="ident">off_t</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">pwritev</span>(<span class="ident">fd</span>, <span class="ident">iov</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">iovec</span>, <span class="ident">iov</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>, <span class="ident">offset</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;preadv_pwritev&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">preadv</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">iov</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">&gt;</span>],
<span class="ident">offset</span>: <span class="ident">off_t</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">preadv</span>(<span class="ident">fd</span>, <span class="ident">iov</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">iovec</span>, <span class="ident">iov</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>, <span class="ident">offset</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pwrite</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">buf</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">offset</span>: <span class="ident">off_t</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">pwrite</span>(<span class="ident">fd</span>, <span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>,
<span class="ident">offset</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pread</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">offset</span>: <span class="ident">off_t</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>{
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">pread</span>(<span class="ident">fd</span>, <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>,
<span class="ident">offset</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">libc</span>::<span class="ident">iovec</span>, <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>);
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slice</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">u8</span>] {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;
<span class="kw">unsafe</span> {
<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">iov_base</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>,
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">iov_len</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
}
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
<span class="ident">IoVec</span>(<span class="ident">libc</span>::<span class="ident">iovec</span> {
<span class="ident">iov_base</span>: <span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
<span class="ident">iov_len</span>: <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>,
}, <span class="ident">PhantomData</span>)
}
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_mut_slice</span>(<span class="ident">buf</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">&gt;</span> {
<span class="ident">IoVec</span>(<span class="ident">libc</span>::<span class="ident">iovec</span> {
<span class="ident">iov_base</span>: <span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
<span class="ident">iov_len</span>: <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>,
}, <span class="ident">PhantomData</span>)
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">test_size_of_io_vec</span>() {
<span class="kw">use</span> <span class="ident">nixtest</span>;
<span class="ident">nixtest</span>::<span class="ident">assert_size_of</span>::<span class="op">&lt;</span><span class="ident">IoVec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span>(<span class="string">&quot;iovec&quot;</span>);
}
</pre>
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