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<span class="doccomment">//! Tiny poll ffi</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A tiny wrapper around libc's poll system call.</span>
<span class="kw">use</span> <span class="ident">libc</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">error</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">pollfd</span>;
<span class="macro">bitflags</span><span class="macro">!</span> {
<span class="kw">pub</span> <span class="ident">flags</span> <span class="ident">PollFlags</span>: ::<span class="ident">libc</span>::<span class="ident">c_short</span> {
<span class="kw">const</span> <span class="ident">POLLIN</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLIN</span>,
<span class="kw">const</span> <span class="ident">POLLPRI</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLPRI</span>,
<span class="kw">const</span> <span class="ident">POLLOUT</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLOUT</span>,
<span class="kw">const</span> <span class="ident">POLLERR</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLERR</span>,
<span class="kw">const</span> <span class="ident">POLLHUP</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLHUP</span>,
<span class="kw">const</span> <span class="ident">POLLNVAL</span> <span class="op">=</span> ::<span class="ident">libc</span>::<span class="ident">POLLNVAL</span>,
}
}
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">PollDescriptors</span> {
<span class="kw">fn</span> <span class="ident">count</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span>;
<span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">pollfd</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">fn</span> <span class="ident">revents</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">&</span>[<span class="ident">pollfd</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">PollFlags</span><span class="op">></span>;
<span class="doccomment">/// Wrapper around count and fill - returns an array of pollfds</span>
<span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">pollfd</span><span class="op">>></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">pollfd</span> { <span class="ident">fd</span>: <span class="number">0</span>, <span class="ident">events</span>: <span class="number">0</span>, <span class="ident">revents</span>: <span class="number">0</span> }; <span class="self">self</span>.<span class="ident">count</span>()];
<span class="kw">if</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>)) <span class="op">!=</span> <span class="ident">v</span>.<span class="ident">len</span>() { <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="prelude-val">Some</span>(<span class="string">"did not fill the poll descriptors array"</span>.<span class="ident">into</span>()), <span class="number">0</span>)) }
<span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="ident">v</span>) }
}
}
<span class="kw">impl</span> <span class="ident">PollDescriptors</span> <span class="kw">for</span> <span class="ident">pollfd</span> {
<span class="kw">fn</span> <span class="ident">count</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="number">1</span> }
<span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">a</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">pollfd</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="ident">a</span>[<span class="number">0</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">clone</span>(); <span class="prelude-val">Ok</span>(<span class="number">1</span>) }
<span class="kw">fn</span> <span class="ident">revents</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">a</span>: <span class="kw-2">&</span>[<span class="ident">pollfd</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">PollFlags</span><span class="op">></span> { <span class="prelude-val">Ok</span>(<span class="ident">PollFlags</span>::<span class="ident">from_bits_truncate</span>(<span class="ident">a</span>[<span class="number">0</span>].<span class="ident">revents</span>)) }
}
<span class="doccomment">/// Wrapper around the libc poll call.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">poll</span>(<span class="ident">fds</span>: <span class="kw-2">&</span><span class="kw-2">mut</span>[<span class="ident">pollfd</span>], <span class="ident">timeout</span>: <span class="ident">i32</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">r</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">poll</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">fds</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_ulong</span>, <span class="ident">timeout</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>) };
<span class="kw">if</span> <span class="ident">r</span> <span class="op">>=</span> <span class="number">0</span> { <span class="prelude-val">Ok</span>(<span class="ident">r</span> <span class="kw">as</span> <span class="ident">usize</span>) } <span class="kw">else</span> {
<span class="ident">from_code</span>(<span class="string">"poll"</span>, <span class="op">-</span><span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>().<span class="ident">raw_os_error</span>().<span class="ident">unwrap</span>()).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="macro">unreachable</span><span class="macro">!</span>())
}
}
<span class="doccomment">/// Builds a pollfd array, polls it, and returns the poll descriptors which have non-zero revents.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">poll_all</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">desc</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">PollDescriptors</span>], <span class="ident">timeout</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">PollDescriptors</span>, <span class="ident">PollFlags</span>)<span class="op">>></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pollfds</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">pollfd</span><span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">indices</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>();
<span class="kw">for</span> <span class="ident">v2</span> <span class="kw">in</span> <span class="ident">desc</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">q</span><span class="op">|</span> <span class="ident">q</span>.<span class="ident">get</span>()) {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">v2</span>);
<span class="ident">indices</span>.<span class="ident">push</span>((<span class="ident">pollfds</span>.<span class="ident">len</span>() .. <span class="ident">pollfds</span>.<span class="ident">len</span>()<span class="op">+</span><span class="ident">v</span>.<span class="ident">len</span>()));
<span class="ident">pollfds</span>.<span class="ident">extend</span>(<span class="ident">v</span>);
};
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pollfds</span>, <span class="ident">timeout</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>();
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">r</span>) <span class="kw">in</span> <span class="ident">indices</span>.<span class="ident">into_iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">let</span> <span class="ident">z</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">desc</span>[<span class="ident">i</span>].<span class="ident">revents</span>(<span class="kw-2">&</span><span class="ident">pollfds</span>[<span class="ident">r</span>]));
<span class="kw">if</span> <span class="op">!</span><span class="ident">z</span>.<span class="ident">is_empty</span>() { <span class="ident">res</span>.<span class="ident">push</span>((<span class="ident">desc</span>[<span class="ident">i</span>], <span class="ident">z</span>)); }
}
<span class="prelude-val">Ok</span>(<span class="ident">res</span>)
}
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