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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">sys</span>, <span class="ident">Token</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="doccomment">/// A readiness event.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Event` is a readiness state paired with a [`Token`]. It is returned by</span>
<span class="doccomment">/// [`Poll::poll`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more documentation on polling and events, see [`Poll`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Poll::poll`]: ../struct.Poll.html#method.poll</span>
<span class="doccomment">/// [`Poll`]: ../struct.Poll.html</span>
<span class="doccomment">/// [`Token`]: ../struct.Token.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">transparent</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Event</span> {
<span class="ident">inner</span>: <span class="ident">sys</span>::<span class="ident">Event</span>,
}
<span class="kw">impl</span> <span class="ident">Event</span> {
<span class="doccomment">/// Returns the event&#39;s token.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">token</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Token</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">token</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains readable readiness.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_readable</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_readable</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains writable readiness.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_writable</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_writable</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains error readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Error events occur when the socket enters an error state. In this case,</span>
<span class="doccomment">/// the socket will also receive a readable or writable event. Reading or</span>
<span class="doccomment">/// writing to the socket will result in an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is available on all platforms, but not all platforms trigger the</span>
<span class="doccomment">/// error event.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The table below shows what flags are checked on what OS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | [OS selector] | Flag(s) checked |</span>
<span class="doccomment">/// |---------------|-----------------|</span>
<span class="doccomment">/// | [epoll] | `EPOLLERR` |</span>
<span class="doccomment">/// | [kqueue] | `EV_ERROR` and `EV_EOF` with `fflags` set to `0`. |</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [OS selector]: ../struct.Poll.html#implementation-notes</span>
<span class="doccomment">/// [epoll]: http://man7.org/linux/man-pages/man7/epoll.7.html</span>
<span class="doccomment">/// [kqueue]: https://www.freebsd.org/cgi/man.cgi?query=kqueue&amp;sektion=2</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_error</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_error</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains read closed readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Read closed readiness can be expected after any of the following have</span>
<span class="doccomment">/// occurred:</span>
<span class="doccomment">/// * The local stream has shutdown the read half of its socket</span>
<span class="doccomment">/// * The local stream has shutdown both the read half and the write half</span>
<span class="doccomment">/// of its socket</span>
<span class="doccomment">/// * The peer stream has shutdown the write half its socket; this sends a</span>
<span class="doccomment">/// `FIN` packet that has been received by the local stream</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is a best effort implementation. While some platforms may not</span>
<span class="doccomment">/// return readiness when read half is closed, it is guaranteed that</span>
<span class="doccomment">/// false-positives will not occur.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The table below shows what flags are checked on what OS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | [OS selector] | Flag(s) checked |</span>
<span class="doccomment">/// |---------------|-----------------|</span>
<span class="doccomment">/// | [epoll] | `EPOLLHUP`, or |</span>
<span class="doccomment">/// | | `EPOLLIN` and `EPOLLRDHUP` |</span>
<span class="doccomment">/// | [kqueue] | `EV_EOF` |</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [OS selector]: ../struct.Poll.html#implementation-notes</span>
<span class="doccomment">/// [epoll]: http://man7.org/linux/man-pages/man7/epoll.7.html</span>
<span class="doccomment">/// [kqueue]: https://www.freebsd.org/cgi/man.cgi?query=kqueue&amp;sektion=2</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_read_closed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_read_closed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains write closed readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On [epoll] this is essentially a check for `EPOLLHUP` flag as the</span>
<span class="doccomment">/// local stream shutting down its write half does not trigger this event.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On [kqueue] the local stream shutting down the write half of its</span>
<span class="doccomment">/// socket will trigger this event.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is a best effort implementation. While some platforms may not</span>
<span class="doccomment">/// return readiness when write half is closed, it is guaranteed that</span>
<span class="doccomment">/// false-positives will not occur.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The table below shows what flags are checked on what OS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | [OS selector] | Flag(s) checked |</span>
<span class="doccomment">/// |---------------|-----------------|</span>
<span class="doccomment">/// | [epoll] | `EPOLLHUP`, or |</span>
<span class="doccomment">/// | | only `EPOLLERR`, or |</span>
<span class="doccomment">/// | | `EPOLLOUT` and `EPOLLERR` |</span>
<span class="doccomment">/// | [kqueue] | `EV_EOF` |</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [OS selector]: ../struct.Poll.html#implementation-notes</span>
<span class="doccomment">/// [epoll]: http://man7.org/linux/man-pages/man7/epoll.7.html</span>
<span class="doccomment">/// [kqueue]: https://www.freebsd.org/cgi/man.cgi?query=kqueue&amp;sektion=2</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_write_closed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_write_closed</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains priority readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is available on all platforms, but not all platforms trigger the</span>
<span class="doccomment">/// priority event.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The table below shows what flags are checked on what OS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | [OS selector] | Flag(s) checked |</span>
<span class="doccomment">/// |---------------|-----------------|</span>
<span class="doccomment">/// | [epoll] | `EPOLLPRI` |</span>
<span class="doccomment">/// | [kqueue] | *Not supported* |</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [OS selector]: ../struct.Poll.html#implementation-notes</span>
<span class="doccomment">/// [epoll]: http://man7.org/linux/man-pages/man7/epoll.7.html</span>
<span class="doccomment">/// [kqueue]: https://www.freebsd.org/cgi/man.cgi?query=kqueue&amp;sektion=2</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_priority</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_priority</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains AIO readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is available on all platforms, but not all platforms support AIO.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The table below shows what flags are checked on what OS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | [OS selector] | Flag(s) checked |</span>
<span class="doccomment">/// |---------------|-----------------|</span>
<span class="doccomment">/// | [epoll] | *Not supported* |</span>
<span class="doccomment">/// | [kqueue]&lt;sup&gt;1&lt;/sup&gt; | `EVFILT_AIO` |</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1: Only supported on DragonFly BSD, FreeBSD, iOS and macOS.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [OS selector]: ../struct.Poll.html#implementation-notes</span>
<span class="doccomment">/// [epoll]: http://man7.org/linux/man-pages/man7/epoll.7.html</span>
<span class="doccomment">/// [kqueue]: https://www.freebsd.org/cgi/man.cgi?query=kqueue&amp;sektion=2</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_aio</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_aio</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns true if the event contains LIO readiness.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Method is available on all platforms, but only FreeBSD supports LIO. On</span>
<span class="doccomment">/// FreeBSD this method checks the `EVFILT_LIO` flag.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_lio</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">is_lio</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Create a reference to an `Event` from a platform specific event.</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">from_sys_event_ref</span>(<span class="ident">sys_event</span>: <span class="kw-2">&amp;</span><span class="ident">sys</span>::<span class="ident">Event</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Event</span> {
<span class="kw">unsafe</span> {
<span class="comment">// This is safe because the memory layout of `Event` is</span>
<span class="comment">// the same as `sys::Event` due to the `repr(transparent)` attribute.</span>
<span class="kw-2">&amp;</span><span class="kw-2">*</span>(<span class="ident">sys_event</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">sys</span>::<span class="ident">Event</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Event</span>)
}
}
}
<span class="doccomment">/// When the [alternate] flag is enabled this will print platform specific</span>
<span class="doccomment">/// details, for example the fields of the `kevent` structure on platforms that</span>
<span class="doccomment">/// use `kqueue(2)`. Note however that the output of this implementation is</span>
<span class="doccomment">/// **not** consider a part of the stable API.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [alternate]: fmt::Formatter::alternate</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Event</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">alternate</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">alternate</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">&quot;Event&quot;</span>);
<span class="ident">d</span>.<span class="ident">field</span>(<span class="string">&quot;token&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">token</span>())
.<span class="ident">field</span>(<span class="string">&quot;readable&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_readable</span>())
.<span class="ident">field</span>(<span class="string">&quot;writable&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_writable</span>())
.<span class="ident">field</span>(<span class="string">&quot;error&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_error</span>())
.<span class="ident">field</span>(<span class="string">&quot;read_closed&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_read_closed</span>())
.<span class="ident">field</span>(<span class="string">&quot;write_closed&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_write_closed</span>())
.<span class="ident">field</span>(<span class="string">&quot;priority&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_priority</span>())
.<span class="ident">field</span>(<span class="string">&quot;aio&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_aio</span>())
.<span class="ident">field</span>(<span class="string">&quot;lio&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">is_lio</span>());
<span class="kw">if</span> <span class="ident">alternate</span> {
<span class="kw">struct</span> <span class="ident">EventDetails</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">sys</span>::<span class="ident">Event</span>);
<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">EventDetails</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">sys</span>::<span class="ident">event</span>::<span class="ident">debug_details</span>(<span class="ident">f</span>, <span class="self">self</span>.<span class="number">0</span>)
}
}
<span class="ident">d</span>.<span class="ident">field</span>(<span class="string">&quot;details&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">EventDetails</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">inner</span>)).<span class="ident">finish</span>()
} <span class="kw">else</span> {
<span class="ident">d</span>.<span class="ident">finish</span>()
}
}
}
</pre></div>
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