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 </pre><pre class="rust ">
 <span class="kw">use</span> {<span class="ident">Errno</span>, <span class="prelude-ty">Result</span>, <span class="ident">NixPath</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_uint</span>};
 <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">stat</span>::<span class="ident">Mode</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="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">use</span> <span class="ident">sys</span>::<span class="ident">uio</span>::<span class="ident">IoVec</span>;  <span class="comment">// For vmsplice</span>

 <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">consts</span>::<span class="kw-2">*</span>;

 <span class="comment">// TODO: The remainder of the ffi module should be removed afer work on</span>
 <span class="comment">// https://github.com/rust-lang/libc/issues/235 is resolved.</span>
 <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</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">pub</span> <span class="kw">const</span> <span class="ident">F_ADD_SEALS</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="number">1033</span>;
     <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">F_GET_SEALS</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="number">1034</span>;
 }

 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">open</span><span class="op">&lt;</span><span class="ident">P</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">NixPath</span><span class="op">&gt;</span>(<span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">P</span>, <span class="ident">oflag</span>: <span class="ident">OFlag</span>, <span class="ident">mode</span>: <span class="ident">Mode</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">RawFd</span><span class="op">&gt;</span> {
     <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">path</span>.<span class="ident">with_nix_path</span>(<span class="op">|</span><span class="ident">cstr</span><span class="op">|</span> {
         <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">open</span>(<span class="ident">cstr</span>.<span class="ident">as_ptr</span>(), <span class="ident">oflag</span>.<span class="ident">bits</span>(), <span class="ident">mode</span>.<span class="ident">bits</span>() <span class="kw">as</span> <span class="ident">c_uint</span>) }
     }));

     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">fd</span>)
 }

 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">FcntlArg</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
     <span class="ident">F_DUPFD</span>(<span class="ident">RawFd</span>),
     <span class="ident">F_DUPFD_CLOEXEC</span>(<span class="ident">RawFd</span>),
     <span class="ident">F_GETFD</span>,
     <span class="ident">F_SETFD</span>(<span class="ident">FdFlag</span>), <span class="comment">// FD_FLAGS</span>
     <span class="ident">F_GETFL</span>,
     <span class="ident">F_SETFL</span>(<span class="ident">OFlag</span>), <span class="comment">// O_NONBLOCK</span>
     <span class="ident">F_SETLK</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">libc</span>::<span class="ident">flock</span>),
     <span class="ident">F_SETLKW</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">libc</span>::<span class="ident">flock</span>),
     <span class="ident">F_GETLK</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">flock</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="ident">F_OFD_SETLK</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">libc</span>::<span class="ident">flock</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="ident">F_OFD_SETLKW</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">libc</span>::<span class="ident">flock</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="ident">F_OFD_GETLK</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">flock</span>),
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>)]</span>
     <span class="ident">F_ADD_SEALS</span>(<span class="ident">SealFlag</span>),
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>)]</span>
     <span class="ident">F_GET_SEALS</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="ident">F_FULLFSYNC</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="ident">F_GETPIPE_SZ</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="ident">F_SETPIPE_SZ</span>(<span class="ident">libc</span>::<span class="ident">c_int</span>),

     <span class="comment">// TODO: Rest of flags</span>
 }
 <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">FcntlArg</span>::<span class="kw-2">*</span>;

 <span class="comment">// TODO: Figure out how to handle value fcntl returns</span>
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fcntl</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">arg</span>: <span class="ident">FcntlArg</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">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
         <span class="kw">match</span> <span class="ident">arg</span> {
             <span class="ident">F_DUPFD</span>(<span class="ident">rawfd</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_DUPFD</span>, <span class="ident">rawfd</span>),
             <span class="ident">F_DUPFD_CLOEXEC</span>(<span class="ident">rawfd</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_DUPFD_CLOEXEC</span>, <span class="ident">rawfd</span>),
             <span class="ident">F_GETFD</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_GETFD</span>),
             <span class="ident">F_SETFD</span>(<span class="ident">flag</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETFD</span>, <span class="ident">flag</span>.<span class="ident">bits</span>()),
             <span class="ident">F_GETFL</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_GETFL</span>),
             <span class="ident">F_SETFL</span>(<span class="ident">flag</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETFL</span>, <span class="ident">flag</span>.<span class="ident">bits</span>()),
             <span class="ident">F_SETLK</span>(<span class="ident">flock</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETLK</span>, <span class="ident">flock</span>),
             <span class="ident">F_SETLKW</span>(<span class="ident">flock</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETLKW</span>, <span class="ident">flock</span>),
             <span class="ident">F_GETLK</span>(<span class="ident">flock</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_GETLK</span>, <span class="ident">flock</span>),
             <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>)]</span>
             <span class="ident">F_ADD_SEALS</span>(<span class="ident">flag</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">ffi</span>::<span class="ident">F_ADD_SEALS</span>, <span class="ident">flag</span>.<span class="ident">bits</span>()),
             <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;linux&quot;</span>)]</span>
             <span class="ident">F_GET_SEALS</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">ffi</span>::<span class="ident">F_GET_SEALS</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="ident">F_FULLFSYNC</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_FULLFSYNC</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="ident">F_GETPIPE_SZ</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_GETPIPE_SZ</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="ident">F_SETPIPE_SZ</span>(<span class="ident">size</span>) <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETPIPE_SZ</span>, <span class="ident">size</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="op">=&gt;</span> <span class="macro">unimplemented</span><span class="macro">!</span>()
         }
     };

     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)
 }

 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">FlockArg</span> {
     <span class="ident">LockShared</span>,
     <span class="ident">LockExclusive</span>,
     <span class="ident">Unlock</span>,
     <span class="ident">LockSharedNonblock</span>,
     <span class="ident">LockExclusiveNonblock</span>,
     <span class="ident">UnlockNonblock</span>,
 }

 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flock</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">arg</span>: <span class="ident">FlockArg</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="kw">use</span> <span class="self">self</span>::<span class="ident">FlockArg</span>::<span class="kw-2">*</span>;

     <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
         <span class="kw">match</span> <span class="ident">arg</span> {
             <span class="ident">LockShared</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_SH</span>),
             <span class="ident">LockExclusive</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_EX</span>),
             <span class="ident">Unlock</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_UN</span>),
             <span class="ident">LockSharedNonblock</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_SH</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">LOCK_NB</span>),
             <span class="ident">LockExclusiveNonblock</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_EX</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">LOCK_NB</span>),
             <span class="ident">UnlockNonblock</span> <span class="op">=&gt;</span> <span class="ident">libc</span>::<span class="ident">flock</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">LOCK_UN</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">LOCK_NB</span>),
         }
     };

     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>).<span class="ident">map</span>(<span class="ident">drop</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">pub</span> <span class="kw">fn</span> <span class="ident">splice</span>(<span class="ident">fd_in</span>: <span class="ident">RawFd</span>, <span class="ident">off_in</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">libc</span>::<span class="ident">loff_t</span><span class="op">&gt;</span>,
           <span class="ident">fd_out</span>: <span class="ident">RawFd</span>, <span class="ident">off_out</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">libc</span>::<span class="ident">loff_t</span><span class="op">&gt;</span>,
           <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">flags</span>: <span class="ident">SpliceFFlags</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">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>;
     <span class="kw">let</span> <span class="ident">off_in</span> <span class="op">=</span> <span class="ident">off_in</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">offset</span><span class="op">|</span> <span class="ident">offset</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _).<span class="ident">unwrap_or</span>(<span class="ident">ptr</span>::<span class="ident">null_mut</span>());
     <span class="kw">let</span> <span class="ident">off_out</span> <span class="op">=</span> <span class="ident">off_out</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">offset</span><span class="op">|</span> <span class="ident">offset</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _).<span class="ident">unwrap_or</span>(<span class="ident">ptr</span>::<span class="ident">null_mut</span>());

     <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">splice</span>(<span class="ident">fd_in</span>, <span class="ident">off_in</span>, <span class="ident">fd_out</span>, <span class="ident">off_out</span>, <span class="ident">len</span>, <span class="ident">flags</span>.<span class="ident">bits</span>()) };
     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">ret</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">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">pub</span> <span class="kw">fn</span> <span class="ident">tee</span>(<span class="ident">fd_in</span>: <span class="ident">RawFd</span>, <span class="ident">fd_out</span>: <span class="ident">RawFd</span>, <span class="ident">len</span>: <span class="ident">usize</span>, <span class="ident">flags</span>: <span class="ident">SpliceFFlags</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">ret</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">tee</span>(<span class="ident">fd_in</span>, <span class="ident">fd_out</span>, <span class="ident">len</span>, <span class="ident">flags</span>.<span class="ident">bits</span>()) };
     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">ret</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">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">pub</span> <span class="kw">fn</span> <span class="ident">vmsplice</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">flags</span>: <span class="ident">SpliceFFlags</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">ret</span> <span class="op">=</span> <span class="kw">unsafe</span> {
         <span class="ident">libc</span>::<span class="ident">vmsplice</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="ident">flags</span>.<span class="ident">bits</span>())
     };
     <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">ret</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">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">consts</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_uint</span>};

     <span class="macro">libc_bitflags</span><span class="macro">!</span> {
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">SpliceFFlags</span>: <span class="ident">c_uint</span> {
             <span class="ident">SPLICE_F_MOVE</span>,
             <span class="ident">SPLICE_F_NONBLOCK</span>,
             <span class="ident">SPLICE_F_MORE</span>,
             <span class="ident">SPLICE_F_GIFT</span>,
         }
     }

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">OFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">O_ACCMODE</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_ACCMODE</span>,
             <span class="kw">const</span> <span class="ident">O_RDONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDONLY</span>,
             <span class="kw">const</span> <span class="ident">O_WRONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_WRONLY</span>,
             <span class="kw">const</span> <span class="ident">O_RDWR</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDWR</span>,
             <span class="kw">const</span> <span class="ident">O_CREAT</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CREAT</span>,
             <span class="kw">const</span> <span class="ident">O_EXCL</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_EXCL</span>,
             <span class="kw">const</span> <span class="ident">O_NOCTTY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOCTTY</span>,
             <span class="kw">const</span> <span class="ident">O_TRUNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_TRUNC</span>,
             <span class="kw">const</span> <span class="ident">O_APPEND</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_APPEND</span>,
             <span class="kw">const</span> <span class="ident">O_NONBLOCK</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>,
             <span class="kw">const</span> <span class="ident">O_DSYNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DSYNC</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECT</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DIRECT</span>,
             <span class="kw">const</span> <span class="ident">O_LARGEFILE</span> <span class="op">=</span> <span class="number">0o00100000</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECTORY</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DIRECTORY</span>,
             <span class="kw">const</span> <span class="ident">O_NOFOLLOW</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOFOLLOW</span>,
             <span class="kw">const</span> <span class="ident">O_NOATIME</span>   <span class="op">=</span> <span class="number">0o01000000</span>,
             <span class="kw">const</span> <span class="ident">O_CLOEXEC</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span>,
             <span class="kw">const</span> <span class="ident">O_SYNC</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_SYNC</span>,
             <span class="kw">const</span> <span class="ident">O_PATH</span>      <span class="op">=</span> <span class="number">0o10000000</span>,
             <span class="kw">const</span> <span class="ident">O_TMPFILE</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_TMPFILE</span>,
             <span class="kw">const</span> <span class="ident">O_NDELAY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NDELAY</span>,
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">FD_CLOEXEC</span> <span class="op">=</span> <span class="number">1</span>
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">SealFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">F_SEAL_SEAL</span> <span class="op">=</span> <span class="number">1</span>,
             <span class="kw">const</span> <span class="ident">F_SEAL_SHRINK</span> <span class="op">=</span> <span class="number">2</span>,
             <span class="kw">const</span> <span class="ident">F_SEAL_GROW</span> <span class="op">=</span> <span class="number">4</span>,
             <span class="kw">const</span> <span class="ident">F_SEAL_WRITE</span> <span class="op">=</span> <span class="number">8</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">mod</span> <span class="ident">consts</span> {
     <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">c_int</span>};

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">OFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">O_ACCMODE</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_ACCMODE</span>,
             <span class="kw">const</span> <span class="ident">O_RDONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDONLY</span>,
             <span class="kw">const</span> <span class="ident">O_WRONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_WRONLY</span>,
             <span class="kw">const</span> <span class="ident">O_RDWR</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDWR</span>,
             <span class="kw">const</span> <span class="ident">O_CREAT</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CREAT</span>,
             <span class="kw">const</span> <span class="ident">O_EXCL</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_EXCL</span>,
             <span class="kw">const</span> <span class="ident">O_NOCTTY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOCTTY</span>,
             <span class="kw">const</span> <span class="ident">O_TRUNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_TRUNC</span>,
             <span class="kw">const</span> <span class="ident">O_APPEND</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_APPEND</span>,
             <span class="kw">const</span> <span class="ident">O_NONBLOCK</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>,
             <span class="kw">const</span> <span class="ident">O_DSYNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DSYNC</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECTORY</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DIRECTORY</span>,
             <span class="kw">const</span> <span class="ident">O_NOFOLLOW</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOFOLLOW</span>,
             <span class="kw">const</span> <span class="ident">O_CLOEXEC</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span>,
             <span class="kw">const</span> <span class="ident">O_SYNC</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_SYNC</span>,
             <span class="kw">const</span> <span class="ident">O_NDELAY</span>    <span class="op">=</span> <span class="ident">O_NONBLOCK</span>.<span class="ident">bits</span>,
             <span class="kw">const</span> <span class="ident">O_FSYNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_FSYNC</span>,
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">FD_CLOEXEC</span> <span class="op">=</span> <span class="number">1</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;freebsd&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;openbsd&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">consts</span> {
     <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">c_int</span>};

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">OFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">O_ACCMODE</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_ACCMODE</span>,
             <span class="kw">const</span> <span class="ident">O_RDONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDONLY</span>,
             <span class="kw">const</span> <span class="ident">O_WRONLY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_WRONLY</span>,
             <span class="kw">const</span> <span class="ident">O_RDWR</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_RDWR</span>,
             <span class="kw">const</span> <span class="ident">O_CREAT</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CREAT</span>,
             <span class="kw">const</span> <span class="ident">O_EXCL</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_EXCL</span>,
             <span class="kw">const</span> <span class="ident">O_NOCTTY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOCTTY</span>,
             <span class="kw">const</span> <span class="ident">O_TRUNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_TRUNC</span>,
             <span class="kw">const</span> <span class="ident">O_APPEND</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_APPEND</span>,
             <span class="kw">const</span> <span class="ident">O_NONBLOCK</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECTORY</span> <span class="op">=</span> <span class="number">0x0020000</span>,
             <span class="kw">const</span> <span class="ident">O_NOFOLLOW</span>  <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NOFOLLOW</span>,
             <span class="kw">const</span> <span class="ident">O_CLOEXEC</span>   <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span>,
             <span class="kw">const</span> <span class="ident">O_SYNC</span>      <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_SYNC</span>,
             <span class="kw">const</span> <span class="ident">O_NDELAY</span>    <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_NDELAY</span>,
             <span class="kw">const</span> <span class="ident">O_FSYNC</span>     <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_FSYNC</span>,
             <span class="kw">const</span> <span class="ident">O_SHLOCK</span>    <span class="op">=</span> <span class="number">0x0000080</span>,
             <span class="kw">const</span> <span class="ident">O_EXLOCK</span>    <span class="op">=</span> <span class="number">0x0000020</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECT</span>    <span class="op">=</span> <span class="number">0x0010000</span>,
             <span class="kw">const</span> <span class="ident">O_EXEC</span>      <span class="op">=</span> <span class="number">0x0040000</span>,
             <span class="kw">const</span> <span class="ident">O_TTY_INIT</span>  <span class="op">=</span> <span class="number">0x0080000</span>
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">FD_CLOEXEC</span> <span class="op">=</span> <span class="number">1</span>
         }
     );
 }

 <span class="attribute">#[<span class="ident">cfg</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">consts</span> {
     <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">c_int</span>;

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">OFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">O_ACCMODE</span>   <span class="op">=</span> <span class="number">0x0000003</span>,
             <span class="kw">const</span> <span class="ident">O_RDONLY</span>    <span class="op">=</span> <span class="number">0x0000000</span>,
             <span class="kw">const</span> <span class="ident">O_WRONLY</span>    <span class="op">=</span> <span class="number">0x0000001</span>,
             <span class="kw">const</span> <span class="ident">O_RDWR</span>      <span class="op">=</span> <span class="number">0x0000002</span>,
             <span class="kw">const</span> <span class="ident">O_NONBLOCK</span>  <span class="op">=</span> <span class="number">0x0000004</span>,
             <span class="kw">const</span> <span class="ident">O_APPEND</span>    <span class="op">=</span> <span class="number">0x0000008</span>,
             <span class="kw">const</span> <span class="ident">O_SHLOCK</span>    <span class="op">=</span> <span class="number">0x0000010</span>,
             <span class="kw">const</span> <span class="ident">O_EXLOCK</span>    <span class="op">=</span> <span class="number">0x0000020</span>,
             <span class="kw">const</span> <span class="ident">O_ASYNC</span>     <span class="op">=</span> <span class="number">0x0000040</span>,
             <span class="kw">const</span> <span class="ident">O_SYNC</span>      <span class="op">=</span> <span class="number">0x0000080</span>,
             <span class="kw">const</span> <span class="ident">O_NOFOLLOW</span>  <span class="op">=</span> <span class="number">0x0000100</span>,
             <span class="kw">const</span> <span class="ident">O_CREAT</span>     <span class="op">=</span> <span class="number">0x0000200</span>,
             <span class="kw">const</span> <span class="ident">O_TRUNC</span>     <span class="op">=</span> <span class="number">0x0000400</span>,
             <span class="kw">const</span> <span class="ident">O_EXCL</span>      <span class="op">=</span> <span class="number">0x0000800</span>,
             <span class="kw">const</span> <span class="ident">O_NOCTTY</span>    <span class="op">=</span> <span class="number">0x0008000</span>,
             <span class="kw">const</span> <span class="ident">O_DSYNC</span>     <span class="op">=</span> <span class="number">0x0010000</span>,
             <span class="kw">const</span> <span class="ident">O_RSYNC</span>     <span class="op">=</span> <span class="number">0x0020000</span>,
             <span class="kw">const</span> <span class="ident">O_ALT_IO</span>    <span class="op">=</span> <span class="number">0x0040000</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECT</span>    <span class="op">=</span> <span class="number">0x0080000</span>,
             <span class="kw">const</span> <span class="ident">O_NOSIGPIPE</span> <span class="op">=</span> <span class="number">0x0100000</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECTORY</span> <span class="op">=</span> <span class="number">0x0200000</span>,
             <span class="kw">const</span> <span class="ident">O_CLOEXEC</span>   <span class="op">=</span> <span class="number">0x0400000</span>,
             <span class="kw">const</span> <span class="ident">O_SEARCH</span>    <span class="op">=</span> <span class="number">0x0800000</span>,
             <span class="kw">const</span> <span class="ident">O_FSYNC</span>     <span class="op">=</span> <span class="ident">O_SYNC</span>.<span class="ident">bits</span>,
             <span class="kw">const</span> <span class="ident">O_NDELAY</span>    <span class="op">=</span> <span class="ident">O_NONBLOCK</span>.<span class="ident">bits</span>,
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">FD_CLOEXEC</span> <span class="op">=</span> <span class="number">1</span>
         }
     );
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;dragonfly&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">consts</span> {
     <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">c_int</span>;

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">OFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">O_ACCMODE</span>   <span class="op">=</span> <span class="number">0x0000003</span>,
             <span class="kw">const</span> <span class="ident">O_RDONLY</span>    <span class="op">=</span> <span class="number">0x0000000</span>,
             <span class="kw">const</span> <span class="ident">O_WRONLY</span>    <span class="op">=</span> <span class="number">0x0000001</span>,
             <span class="kw">const</span> <span class="ident">O_RDWR</span>      <span class="op">=</span> <span class="number">0x0000002</span>,
             <span class="kw">const</span> <span class="ident">O_CREAT</span>     <span class="op">=</span> <span class="number">0x0000200</span>,
             <span class="kw">const</span> <span class="ident">O_EXCL</span>      <span class="op">=</span> <span class="number">0x0000800</span>,
             <span class="kw">const</span> <span class="ident">O_NOCTTY</span>    <span class="op">=</span> <span class="number">0x0008000</span>,
             <span class="kw">const</span> <span class="ident">O_TRUNC</span>     <span class="op">=</span> <span class="number">0x0000400</span>,
             <span class="kw">const</span> <span class="ident">O_APPEND</span>    <span class="op">=</span> <span class="number">0x0000008</span>,
             <span class="kw">const</span> <span class="ident">O_NONBLOCK</span>  <span class="op">=</span> <span class="number">0x0000004</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECTORY</span> <span class="op">=</span> <span class="number">0x8000000</span>, <span class="comment">// different from FreeBSD!</span>
             <span class="kw">const</span> <span class="ident">O_NOFOLLOW</span>  <span class="op">=</span> <span class="number">0x0000100</span>,
             <span class="kw">const</span> <span class="ident">O_CLOEXEC</span>   <span class="op">=</span> <span class="number">0x0020000</span>, <span class="comment">// different from FreeBSD!</span>
             <span class="kw">const</span> <span class="ident">O_SYNC</span>      <span class="op">=</span> <span class="number">0x0000080</span>,
             <span class="kw">const</span> <span class="ident">O_NDELAY</span>    <span class="op">=</span> <span class="ident">O_NONBLOCK</span>.<span class="ident">bits</span>,
             <span class="kw">const</span> <span class="ident">O_FSYNC</span>     <span class="op">=</span> <span class="ident">O_SYNC</span>.<span class="ident">bits</span>,
             <span class="kw">const</span> <span class="ident">O_SHLOCK</span>    <span class="op">=</span> <span class="number">0x0000010</span>, <span class="comment">// different from FreeBSD!</span>
             <span class="kw">const</span> <span class="ident">O_EXLOCK</span>    <span class="op">=</span> <span class="number">0x0000020</span>,
             <span class="kw">const</span> <span class="ident">O_DIRECT</span>    <span class="op">=</span> <span class="number">0x0010000</span>,
         }
     );

     <span class="macro">bitflags</span><span class="macro">!</span>(
         <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">c_int</span> {
             <span class="kw">const</span> <span class="ident">FD_CLOEXEC</span> <span class="op">=</span> <span class="number">1</span>
         }
     );
 }
 </pre>
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