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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">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">std</span>::<span class="ident">option</span>::<span class="prelude-ty">Option</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">pid_t</span>};
<span class="kw">use</span> {<span class="ident">Errno</span>, <span class="ident">Error</span>, <span class="prelude-ty">Result</span>};
<span class="comment">// For some functions taking with a parameter of type CloneFlags,</span>
<span class="comment">// only a subset of these flags have an effect.</span>
<span class="macro">libc_bitflags</span><span class="macro">!</span>{
<span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">CloneFlags</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> {
<span class="ident">CLONE_VM</span>,
<span class="ident">CLONE_FS</span>,
<span class="ident">CLONE_FILES</span>,
<span class="ident">CLONE_SIGHAND</span>,
<span class="ident">CLONE_PTRACE</span>,
<span class="ident">CLONE_VFORK</span>,
<span class="ident">CLONE_PARENT</span>,
<span class="ident">CLONE_THREAD</span>,
<span class="ident">CLONE_NEWNS</span>,
<span class="ident">CLONE_SYSVSEM</span>,
<span class="ident">CLONE_SETTLS</span>,
<span class="ident">CLONE_PARENT_SETTID</span>,
<span class="ident">CLONE_CHILD_CLEARTID</span>,
<span class="ident">CLONE_DETACHED</span>,
<span class="ident">CLONE_UNTRACED</span>,
<span class="ident">CLONE_CHILD_SETTID</span>,
<span class="ident">CLONE_NEWCGROUP</span>,
<span class="ident">CLONE_NEWUTS</span>,
<span class="ident">CLONE_NEWIPC</span>,
<span class="ident">CLONE_NEWUSER</span>,
<span class="ident">CLONE_NEWPID</span>,
<span class="ident">CLONE_NEWNET</span>,
<span class="ident">CLONE_IO</span>,
}
}
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">CloneCb</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">FnMut</span>() <span class="op">-&gt;</span> <span class="ident">isize</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</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 class="ident">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CpuSet</span> {
<span class="ident">cpu_set</span>: <span class="ident">libc</span>::<span class="ident">cpu_set_t</span>,
}
<span class="kw">impl</span> <span class="ident">CpuSet</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">CpuSet</span> {
<span class="ident">CpuSet</span> { <span class="ident">cpu_set</span>: <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">zeroed</span>() } }
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_set</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">field</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="ident">field</span> <span class="op">&gt;=</span> <span class="number">8</span> <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">cpu_set_t</span><span class="op">&gt;</span>() {
<span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINVAL</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">CPU_ISSET</span>(<span class="ident">field</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">cpu_set</span>) })
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">field</span>: <span class="ident">usize</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">if</span> <span class="ident">field</span> <span class="op">&gt;=</span> <span class="number">8</span> <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">cpu_set_t</span><span class="op">&gt;</span>() {
<span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINVAL</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">CPU_SET</span>(<span class="ident">field</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">cpu_set</span>) })
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">field</span>: <span class="ident">usize</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">if</span> <span class="ident">field</span> <span class="op">&gt;=</span> <span class="number">8</span> <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">libc</span>::<span class="ident">cpu_set_t</span><span class="op">&gt;</span>() {
<span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINVAL</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">CPU_CLR</span>(<span class="ident">field</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">cpu_set</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_void</span>, <span class="ident">c_int</span>};
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">CloneCb</span> <span class="op">=</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">super</span>::<span class="ident">CloneCb</span>) <span class="op">-&gt;</span> <span class="ident">c_int</span>;
<span class="comment">// We cannot give a proper #[repr(C)] to super::CloneCb</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">improper_ctypes</span>)]</span>
<span class="kw">extern</span> <span class="string">&quot;C&quot;</span> {
<span class="comment">// create a child process</span>
<span class="comment">// doc: http://man7.org/linux/man-pages/man2/clone.2.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clone</span>(<span class="ident">cb</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">CloneCb</span>,
<span class="ident">child_stack</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
<span class="ident">flags</span>: <span class="ident">c_int</span>,
<span class="ident">arg</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">super</span>::<span class="ident">CloneCb</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">sched_setaffinity</span>(<span class="ident">pid</span>: <span class="ident">isize</span>, <span class="ident">cpuset</span>: <span class="kw-2">&amp;</span><span class="ident">CpuSet</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">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">libc</span>::<span class="ident">sched_setaffinity</span>(<span class="ident">pid</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">pid_t</span>,
<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op">&lt;</span><span class="ident">CpuSet</span><span class="op">&gt;</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">size_t</span>,
<span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">cpuset</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="kw">pub</span> <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">mut</span> <span class="ident">cb</span>: <span class="ident">CloneCb</span>,
<span class="ident">stack</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>],
<span class="ident">flags</span>: <span class="ident">CloneFlags</span>,
<span class="ident">signal</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">c_int</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">pid_t</span><span class="op">&gt;</span> {
<span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">callback</span>(<span class="ident">data</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">CloneCb</span>) <span class="op">-&gt;</span> <span class="ident">c_int</span> {
<span class="kw">let</span> <span class="ident">cb</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">CloneCb</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">data</span> };
(<span class="kw-2">*</span><span class="ident">cb</span>)() <span class="kw">as</span> <span class="ident">c_int</span>
}
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">combined</span> <span class="op">=</span> <span class="ident">flags</span>.<span class="ident">bits</span>() <span class="op">|</span> <span class="ident">signal</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">stack</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">let</span> <span class="ident">ptr_aligned</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>((<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">%</span> <span class="number">16</span>) <span class="kw">as</span> <span class="ident">isize</span> <span class="op">*</span> <span class="op">-</span><span class="number">1</span>);
<span class="ident">ffi</span>::<span class="ident">clone</span>(<span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">callback</span> <span class="kw">as</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span>(<span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span>::<span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">FnMut</span>() <span class="op">-&gt;</span> <span class="ident">isize</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">i32</span>),
<span class="ident">ptr_aligned</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">combined</span>,
<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cb</span>)
};
<span class="ident">Errno</span>::<span class="ident">result</span>(<span class="ident">res</span>)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unshare</span>(<span class="ident">flags</span>: <span class="ident">CloneFlags</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">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">unshare</span>(<span class="ident">flags</span>.<span class="ident">bits</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="kw">pub</span> <span class="kw">fn</span> <span class="ident">setns</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">nstype</span>: <span class="ident">CloneFlags</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">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">setns</span>(<span class="ident">fd</span>, <span class="ident">nstype</span>.<span class="ident">bits</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>)
}
</pre>
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