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| </pre><pre class="rust "> |
| <span class="doccomment">//! Posix Message Queue functions</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! [Further reading and details on the C API](http://man7.org/linux/man-pages/man7/mq_overview.7.html)</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_char</span>, <span class="ident">c_long</span>, <span class="ident">mode_t</span>, <span class="ident">mqd_t</span>, <span class="ident">size_t</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::<span class="ident">CString</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">mem</span>; |
| |
| <span class="macro">libc_bitflags</span><span class="macro">!</span>{ |
| <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">MQ_OFlag</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> { |
| <span class="ident">O_RDONLY</span>, |
| <span class="ident">O_WRONLY</span>, |
| <span class="ident">O_RDWR</span>, |
| <span class="ident">O_CREAT</span>, |
| <span class="ident">O_EXCL</span>, |
| <span class="ident">O_NONBLOCK</span>, |
| <span class="ident">O_CLOEXEC</span>, |
| } |
| } |
| |
| <span class="macro">libc_bitflags</span><span class="macro">!</span>{ |
| <span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">FdFlag</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> { |
| <span class="ident">FD_CLOEXEC</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">MqAttr</span> { |
| <span class="ident">mq_attr</span>: <span class="ident">libc</span>::<span class="ident">mq_attr</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">MqAttr</span><span class="op">></span> <span class="kw">for</span> <span class="ident">MqAttr</span> { |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">MqAttr</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">let</span> <span class="ident">self_attr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">mq_attr</span>; |
| <span class="kw">let</span> <span class="ident">other_attr</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">mq_attr</span>; |
| <span class="ident">self_attr</span>.<span class="ident">mq_flags</span> <span class="op">==</span> <span class="ident">other_attr</span>.<span class="ident">mq_flags</span> <span class="op">&&</span> <span class="ident">self_attr</span>.<span class="ident">mq_maxmsg</span> <span class="op">==</span> <span class="ident">other_attr</span>.<span class="ident">mq_maxmsg</span> <span class="op">&&</span> |
| <span class="ident">self_attr</span>.<span class="ident">mq_msgsize</span> <span class="op">==</span> <span class="ident">other_attr</span>.<span class="ident">mq_msgsize</span> <span class="op">&&</span> |
| <span class="ident">self_attr</span>.<span class="ident">mq_curmsgs</span> <span class="op">==</span> <span class="ident">other_attr</span>.<span class="ident">mq_curmsgs</span> |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">MqAttr</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">mq_flags</span>: <span class="ident">c_long</span>, |
| <span class="ident">mq_maxmsg</span>: <span class="ident">c_long</span>, |
| <span class="ident">mq_msgsize</span>: <span class="ident">c_long</span>, |
| <span class="ident">mq_curmsgs</span>: <span class="ident">c_long</span>) |
| <span class="op">-></span> <span class="ident">MqAttr</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">mq_attr</span><span class="op">></span>() }; |
| <span class="ident">attr</span>.<span class="ident">mq_flags</span> <span class="op">=</span> <span class="ident">mq_flags</span>; |
| <span class="ident">attr</span>.<span class="ident">mq_maxmsg</span> <span class="op">=</span> <span class="ident">mq_maxmsg</span>; |
| <span class="ident">attr</span>.<span class="ident">mq_msgsize</span> <span class="op">=</span> <span class="ident">mq_msgsize</span>; |
| <span class="ident">attr</span>.<span class="ident">mq_curmsgs</span> <span class="op">=</span> <span class="ident">mq_curmsgs</span>; |
| <span class="ident">MqAttr</span> { <span class="ident">mq_attr</span>: <span class="ident">attr</span> } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flags</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">c_long</span> { |
| <span class="self">self</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_flags</span> |
| } |
| } |
| |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mq_open</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CString</span>, |
| <span class="ident">oflag</span>: <span class="ident">MQ_OFlag</span>, |
| <span class="ident">mode</span>: <span class="ident">Mode</span>, |
| <span class="ident">attr</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">MqAttr</span><span class="op">></span>) |
| <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">mqd_t</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">attr</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">mq_attr</span>) <span class="op">=></span> <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">mq_open</span>(<span class="ident">name</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">mode_t</span>, |
| <span class="kw-2">&</span><span class="ident">mq_attr</span>.<span class="ident">mq_attr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">mq_attr</span>) |
| }, |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">mq_open</span>(<span class="ident">name</span>.<span class="ident">as_ptr</span>(), <span class="ident">oflag</span>.<span class="ident">bits</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">mq_unlink</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CString</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></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">mq_unlink</span>(<span class="ident">name</span>.<span class="ident">as_ptr</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">mq_close</span>(<span class="ident">mqdes</span>: <span class="ident">mqd_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></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">mq_close</span>(<span class="ident">mqdes</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">mq_receive</span>(<span class="ident">mqdes</span>: <span class="ident">mqd_t</span>, <span class="ident">message</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">msg_prio</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">message</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</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">mq_receive</span>(<span class="ident">mqdes</span>, |
| <span class="ident">message</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_char</span>, |
| <span class="ident">len</span>, |
| <span class="ident">msg_prio</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u32</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">mq_send</span>(<span class="ident">mqdes</span>: <span class="ident">mqd_t</span>, <span class="ident">message</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">msq_prio</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></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">mq_send</span>(<span class="ident">mqdes</span>, |
| <span class="ident">message</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_char</span>, |
| <span class="ident">message</span>.<span class="ident">len</span>(), |
| <span class="ident">msq_prio</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">mq_getattr</span>(<span class="ident">mqd</span>: <span class="ident">mqd_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">MqAttr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">mq_attr</span><span class="op">></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">mq_getattr</span>(<span class="ident">mqd</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</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="op">|</span> <span class="ident">MqAttr</span> { <span class="ident">mq_attr</span>: <span class="ident">attr</span> }) |
| } |
| |
| <span class="doccomment">/// Set the attributes of the message queue. Only `O_NONBLOCK` can be set, everything else will be ignored</span> |
| <span class="doccomment">/// Returns the old attributes</span> |
| <span class="doccomment">/// It is recommend to use the `mq_set_nonblock()` and `mq_remove_nonblock()` convenience functions as they are easier to use</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [Further reading](http://man7.org/linux/man-pages/man3/mq_setattr.3.html)</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mq_setattr</span>(<span class="ident">mqd</span>: <span class="ident">mqd_t</span>, <span class="ident">newattr</span>: <span class="kw-2">&</span><span class="ident">MqAttr</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">MqAttr</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">mq_attr</span><span class="op">></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">mq_setattr</span>(<span class="ident">mqd</span>, <span class="kw-2">&</span><span class="ident">newattr</span>.<span class="ident">mq_attr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">mq_attr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</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="op">|</span> <span class="ident">MqAttr</span> { <span class="ident">mq_attr</span>: <span class="ident">attr</span> }) |
| } |
| |
| <span class="doccomment">/// Convenience function.</span> |
| <span class="doccomment">/// Sets the `O_NONBLOCK` attribute for a given message queue descriptor</span> |
| <span class="doccomment">/// Returns the old attributes</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mq_set_nonblock</span>(<span class="ident">mqd</span>: <span class="ident">mqd_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">MqAttr</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">oldattr</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">mq_getattr</span>(<span class="ident">mqd</span>)); |
| <span class="kw">let</span> <span class="ident">newattr</span> <span class="op">=</span> <span class="ident">MqAttr</span>::<span class="ident">new</span>(<span class="ident">O_NONBLOCK</span>.<span class="ident">bits</span>() <span class="kw">as</span> <span class="ident">c_long</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_maxmsg</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_msgsize</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_curmsgs</span>); |
| <span class="ident">mq_setattr</span>(<span class="ident">mqd</span>, <span class="kw-2">&</span><span class="ident">newattr</span>) |
| } |
| |
| <span class="doccomment">/// Convenience function.</span> |
| <span class="doccomment">/// Removes `O_NONBLOCK` attribute for a given message queue descriptor</span> |
| <span class="doccomment">/// Returns the old attributes</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mq_remove_nonblock</span>(<span class="ident">mqd</span>: <span class="ident">mqd_t</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">MqAttr</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">oldattr</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">mq_getattr</span>(<span class="ident">mqd</span>)); |
| <span class="kw">let</span> <span class="ident">newattr</span> <span class="op">=</span> <span class="ident">MqAttr</span>::<span class="ident">new</span>(<span class="number">0</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_maxmsg</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_msgsize</span>, |
| <span class="ident">oldattr</span>.<span class="ident">mq_attr</span>.<span class="ident">mq_curmsgs</span>); |
| <span class="ident">mq_setattr</span>(<span class="ident">mqd</span>, <span class="kw-2">&</span><span class="ident">newattr</span>) |
| } |
| </pre> |
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