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| </pre><div class="example-wrap"><pre class="rust "> |
| <span class="doccomment">//! Unix pipe.</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! See the [`new`] function for documentation.</span> |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">IoSlice</span>, <span class="ident">IoSliceMut</span>, <span class="ident">Read</span>, <span class="ident">Write</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">AsRawFd</span>, <span class="ident">FromRawFd</span>, <span class="ident">IntoRawFd</span>, <span class="ident">RawFd</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">process</span>::{<span class="ident">ChildStderr</span>, <span class="ident">ChildStdin</span>, <span class="ident">ChildStdout</span>}; |
| |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">io_source</span>::<span class="ident">IoSource</span>; |
| <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">event</span>, <span class="ident">Interest</span>, <span class="ident">Registry</span>, <span class="ident">Token</span>}; |
| |
| <span class="doccomment">/// Create a new non-blocking Unix pipe.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is a wrapper around Unix's [`pipe(2)`] system call and can be used as</span> |
| <span class="doccomment">/// inter-process or thread communication channel.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This channel may be created before forking the process and then one end used</span> |
| <span class="doccomment">/// in each process, e.g. the parent process has the sending end to send command</span> |
| <span class="doccomment">/// to the child process.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`pipe(2)`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pipe.html</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Events</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The [`Sender`] can be registered with [`WRITABLE`] interest to receive</span> |
| <span class="doccomment">/// [writable events], the [`Receiver`] with [`READABLE`] interest. Once data is</span> |
| <span class="doccomment">/// written to the `Sender` the `Receiver` will receive an [readable event].</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// In addition to those events, events will also be generated if the other side</span> |
| <span class="doccomment">/// is dropped. To check if the `Sender` is dropped you'll need to check</span> |
| <span class="doccomment">/// [`is_read_closed`] on events for the `Receiver`, if it returns true the</span> |
| <span class="doccomment">/// `Sender` is dropped. On the `Sender` end check [`is_write_closed`], if it</span> |
| <span class="doccomment">/// returns true the `Receiver` was dropped. Also see the second example below.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`WRITABLE`]: Interest::WRITABLE</span> |
| <span class="doccomment">/// [writable events]: event::Event::is_writable</span> |
| <span class="doccomment">/// [`READABLE`]: Interest::READABLE</span> |
| <span class="doccomment">/// [readable event]: event::Event::is_readable</span> |
| <span class="doccomment">/// [`is_read_closed`]: event::Event::is_read_closed</span> |
| <span class="doccomment">/// [`is_write_closed`]: event::Event::is_write_closed</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Deregistering</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Both `Sender` and `Receiver` will deregister themselves when dropped,</span> |
| <span class="doccomment">/// **iff** the file descriptors are not duplicated (via [`dup(2)`]).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`dup(2)`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dup.html</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Examples</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Simple example that writes data into the sending end and read it from the</span> |
| <span class="doccomment">/// receiving end.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use std::io::{self, Read, Write};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// use mio::{Poll, Events, Interest, Token};</span> |
| <span class="doccomment">/// use mio::unix::pipe;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Unique tokens for the two ends of the channel.</span> |
| <span class="doccomment">/// const PIPE_RECV: Token = Token(0);</span> |
| <span class="doccomment">/// const PIPE_SEND: Token = Token(1);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # fn main() -> io::Result<()> {</span> |
| <span class="doccomment">/// // Create our `Poll` instance and the `Events` container.</span> |
| <span class="doccomment">/// let mut poll = Poll::new()?;</span> |
| <span class="doccomment">/// let mut events = Events::with_capacity(8);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Create a new pipe.</span> |
| <span class="doccomment">/// let (mut sender, mut receiver) = pipe::new()?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Register both ends of the channel.</span> |
| <span class="doccomment">/// poll.registry().register(&mut receiver, PIPE_RECV, Interest::READABLE)?;</span> |
| <span class="doccomment">/// poll.registry().register(&mut sender, PIPE_SEND, Interest::WRITABLE)?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// const MSG: &[u8; 11] = b"Hello world";</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// loop {</span> |
| <span class="doccomment">/// poll.poll(&mut events, None)?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// for event in events.iter() {</span> |
| <span class="doccomment">/// match event.token() {</span> |
| <span class="doccomment">/// PIPE_SEND => sender.write(MSG)</span> |
| <span class="doccomment">/// .and_then(|n| if n != MSG.len() {</span> |
| <span class="doccomment">/// // We'll consider a short write an error in this</span> |
| <span class="doccomment">/// // example. NOTE: we can't use `write_all` with</span> |
| <span class="doccomment">/// // non-blocking I/O.</span> |
| <span class="doccomment">/// Err(io::ErrorKind::WriteZero.into())</span> |
| <span class="doccomment">/// } else {</span> |
| <span class="doccomment">/// Ok(())</span> |
| <span class="doccomment">/// })?,</span> |
| <span class="doccomment">/// PIPE_RECV => {</span> |
| <span class="doccomment">/// let mut buf = [0; 11];</span> |
| <span class="doccomment">/// let n = receiver.read(&mut buf)?;</span> |
| <span class="doccomment">/// println!("received: {:?}", &buf[0..n]);</span> |
| <span class="doccomment">/// assert_eq!(n, MSG.len());</span> |
| <span class="doccomment">/// assert_eq!(&buf, &*MSG);</span> |
| <span class="doccomment">/// return Ok(());</span> |
| <span class="doccomment">/// },</span> |
| <span class="doccomment">/// _ => unreachable!(),</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Example that receives an event once the `Sender` is dropped.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// # use std::io;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # use mio::{Poll, Events, Interest, Token};</span> |
| <span class="doccomment">/// # use mio::unix::pipe;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # const PIPE_RECV: Token = Token(0);</span> |
| <span class="doccomment">/// # const PIPE_SEND: Token = Token(1);</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # fn main() -> io::Result<()> {</span> |
| <span class="doccomment">/// // Same setup as in the example above.</span> |
| <span class="doccomment">/// let mut poll = Poll::new()?;</span> |
| <span class="doccomment">/// let mut events = Events::with_capacity(8);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let (mut sender, mut receiver) = pipe::new()?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// poll.registry().register(&mut receiver, PIPE_RECV, Interest::READABLE)?;</span> |
| <span class="doccomment">/// poll.registry().register(&mut sender, PIPE_SEND, Interest::WRITABLE)?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// // Drop the sender.</span> |
| <span class="doccomment">/// drop(sender);</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// poll.poll(&mut events, None)?;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// for event in events.iter() {</span> |
| <span class="doccomment">/// match event.token() {</span> |
| <span class="doccomment">/// PIPE_RECV if event.is_read_closed() => {</span> |
| <span class="doccomment">/// // Detected that the sender was dropped.</span> |
| <span class="doccomment">/// println!("Sender dropped!");</span> |
| <span class="doccomment">/// return Ok(());</span> |
| <span class="doccomment">/// },</span> |
| <span class="doccomment">/// _ => unreachable!(),</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// # unreachable!();</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">Sender</span>, <span class="ident">Receiver</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span>: [<span class="ident">RawFd</span>; <span class="number">2</span>] <span class="op">=</span> [<span class="op">-</span><span class="number">1</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">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>, |
| ))]</span> |
| <span class="kw">unsafe</span> { |
| <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">pipe2</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</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">"ios"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>))]</span> |
| <span class="kw">unsafe</span> { |
| <span class="comment">// For platforms that don't have `pipe2(2)` we need to manually set the</span> |
| <span class="comment">// correct flags on the file descriptor.</span> |
| <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">pipe</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>()) <span class="op">!</span><span class="op">=</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>()); |
| } |
| |
| <span class="kw">for</span> <span class="ident">fd</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">fds</span> { |
| <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="kw-2">*</span><span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETFL</span>, <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span> |
| <span class="op">|</span><span class="op">|</span> <span class="ident">libc</span>::<span class="ident">fcntl</span>(<span class="kw-2">*</span><span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">F_SETFD</span>, <span class="ident">libc</span>::<span class="ident">FD_CLOEXEC</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span> |
| { |
| <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>(); |
| <span class="comment">// Don't leak file descriptors. Can't handle error though.</span> |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">close</span>(<span class="ident">fds</span>[<span class="number">0</span>]); |
| <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">close</span>(<span class="ident">fds</span>[<span class="number">1</span>]); |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>); |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>( |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>, |
| )))]</span> |
| <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"unsupported target for `mio::unix::pipe`"</span>); |
| |
| <span class="comment">// Safety: we just initialised the `fds` above.</span> |
| <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Receiver</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">0</span>]) }; |
| <span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Sender</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">1</span>]) }; |
| <span class="prelude-val">Ok</span>((<span class="ident">w</span>, <span class="ident">r</span>)) |
| } |
| |
| <span class="doccomment">/// Sending end of an Unix pipe.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See [`new`] for documentation, including examples.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Sender</span> { |
| <span class="ident">inner</span>: <span class="ident">IoSource</span><span class="op"><</span><span class="ident">File</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Sender</span> { |
| <span class="doccomment">/// Set the `Sender` into or out of non-blocking mode.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_nonblocking</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nonblocking</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="ident">set_nonblocking</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">nonblocking</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">event</span>::<span class="ident">Source</span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">register</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>, |
| <span class="ident">token</span>: <span class="ident">Token</span>, |
| <span class="ident">interests</span>: <span class="ident">Interest</span>, |
| ) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">register</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">reregister</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>, |
| <span class="ident">token</span>: <span class="ident">Token</span>, |
| <span class="ident">interests</span>: <span class="ident">Interest</span>, |
| ) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">reregister</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">deregister</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">deregister</span>(<span class="ident">registry</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">write</span>(<span class="ident">buf</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">write_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span>[<span class="ident">IoSlice</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">write_vectored</span>(<span class="ident">bufs</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">flush</span>()) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">write</span>(<span class="ident">buf</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">write_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span>[<span class="ident">IoSlice</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">write_vectored</span>(<span class="ident">bufs</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">flush</span>()) |
| } |
| } |
| |
| <span class="doccomment">/// # Notes</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The underlying pipe is **not** set to non-blocking.</span> |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ChildStdin</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">stdin</span>: <span class="ident">ChildStdin</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Sender</span> { |
| <span class="comment">// Safety: `ChildStdin` is guaranteed to be a valid file descriptor.</span> |
| <span class="kw">unsafe</span> { <span class="ident">Sender</span>::<span class="ident">from_raw_fd</span>(<span class="ident">stdin</span>.<span class="ident">into_raw_fd</span>()) } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">FromRawFd</span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_fd</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Sender</span> { |
| <span class="ident">Sender</span> { |
| <span class="ident">inner</span>: <span class="ident">IoSource</span>::<span class="ident">new</span>(<span class="ident">File</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fd</span>)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">AsRawFd</span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">as_raw_fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RawFd</span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">IntoRawFd</span> <span class="kw">for</span> <span class="ident">Sender</span> { |
| <span class="kw">fn</span> <span class="ident">into_raw_fd</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RawFd</span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">into_inner</span>().<span class="ident">into_raw_fd</span>() |
| } |
| } |
| |
| <span class="doccomment">/// Receiving end of an Unix pipe.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// See [`new`] for documentation, including examples.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Receiver</span> { |
| <span class="ident">inner</span>: <span class="ident">IoSource</span><span class="op"><</span><span class="ident">File</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Receiver</span> { |
| <span class="doccomment">/// Set the `Receiver` into or out of non-blocking mode.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_nonblocking</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nonblocking</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="ident">set_nonblocking</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">nonblocking</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">event</span>::<span class="ident">Source</span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">register</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>, |
| <span class="ident">token</span>: <span class="ident">Token</span>, |
| <span class="ident">interests</span>: <span class="ident">Interest</span>, |
| ) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">register</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">reregister</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, |
| <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>, |
| <span class="ident">token</span>: <span class="ident">Token</span>, |
| <span class="ident">interests</span>: <span class="ident">Interest</span>, |
| ) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">reregister</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">deregister</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">deregister</span>(<span class="ident">registry</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">read</span>(<span class="ident">buf</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">read_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">IoSliceMut</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">read_vectored</span>(<span class="ident">bufs</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">read</span>(<span class="ident">buf</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">read_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">IoSliceMut</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">do_io</span>(<span class="op">|</span><span class="ident">sender</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">sender</span>).<span class="ident">read_vectored</span>(<span class="ident">bufs</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// # Notes</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The underlying pipe is **not** set to non-blocking.</span> |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ChildStdout</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">stdout</span>: <span class="ident">ChildStdout</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span> { |
| <span class="comment">// Safety: `ChildStdout` is guaranteed to be a valid file descriptor.</span> |
| <span class="kw">unsafe</span> { <span class="ident">Receiver</span>::<span class="ident">from_raw_fd</span>(<span class="ident">stdout</span>.<span class="ident">into_raw_fd</span>()) } |
| } |
| } |
| |
| <span class="doccomment">/// # Notes</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The underlying pipe is **not** set to non-blocking.</span> |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ChildStderr</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">stderr</span>: <span class="ident">ChildStderr</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span> { |
| <span class="comment">// Safety: `ChildStderr` is guaranteed to be a valid file descriptor.</span> |
| <span class="kw">unsafe</span> { <span class="ident">Receiver</span>::<span class="ident">from_raw_fd</span>(<span class="ident">stderr</span>.<span class="ident">into_raw_fd</span>()) } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">FromRawFd</span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_fd</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span> { |
| <span class="ident">Receiver</span> { |
| <span class="ident">inner</span>: <span class="ident">IoSource</span>::<span class="ident">new</span>(<span class="ident">File</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fd</span>)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">AsRawFd</span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">as_raw_fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RawFd</span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>() |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">IntoRawFd</span> <span class="kw">for</span> <span class="ident">Receiver</span> { |
| <span class="kw">fn</span> <span class="ident">into_raw_fd</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RawFd</span> { |
| <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">into_inner</span>().<span class="ident">into_raw_fd</span>() |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>))]</span> |
| <span class="kw">fn</span> <span class="ident">set_nonblocking</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">nonblocking</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">nonblocking</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>; |
| <span class="kw">if</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">ioctl</span>(<span class="ident">fd</span>, <span class="ident">libc</span>::<span class="ident">FIONBIO</span>, <span class="kw-2">&</span><span class="ident">value</span>) } <span class="op">=</span><span class="op">=</span> <span class="op">-</span><span class="number">1</span> { |
| <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>()) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">set_nonblocking</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">nonblocking</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="kw">unsafe</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="kw">if</span> <span class="ident">flags</span> <span class="op"><</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>()); |
| } |
| |
| <span class="kw">let</span> <span class="ident">nflags</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">nonblocking</span> { |
| <span class="ident">flags</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span> |
| } <span class="kw">else</span> { |
| <span class="ident">flags</span> <span class="op">&</span> <span class="op">!</span><span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span> |
| }; |
| |
| <span class="kw">if</span> <span class="ident">flags</span> <span class="op">!</span><span class="op">=</span> <span class="ident">nflags</span> { |
| <span class="kw">if</span> <span class="kw">unsafe</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">nflags</span>) } <span class="op"><</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>()); |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| </pre></div> |
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