| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.8.8/src/sys/unix/selector/epoll.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>epoll.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../../normalize.css"><link rel="stylesheet" href="../../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../../dark.css" disabled><link rel="stylesheet" href="../../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../../storage.js"></script><script defer src="../../../../../source-script.js"></script><script defer src="../../../../../source-files.js"></script><script defer src="../../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../../mio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../../mio/index.html"><img class="rust-logo" src="../../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use crate</span>::{Interest, Token}; |
| |
| <span class="kw">use </span>libc::{EPOLLET, EPOLLIN, EPOLLOUT, EPOLLPRI, EPOLLRDHUP}; |
| <span class="kw">use </span>std::os::unix::io::{AsRawFd, RawFd}; |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">use </span>std::sync::atomic::{AtomicBool, AtomicUsize, Ordering}; |
| <span class="kw">use </span>std::time::Duration; |
| <span class="kw">use </span>std::{cmp, i32, io, ptr}; |
| |
| <span class="doccomment">/// Unique id for use as `SelectorId`. |
| </span><span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">static </span>NEXT_ID: AtomicUsize = AtomicUsize::new(<span class="number">1</span>); |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Selector { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>id: usize, |
| ep: RawFd, |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>has_waker: AtomicBool, |
| } |
| |
| <span class="kw">impl </span>Selector { |
| <span class="kw">pub fn </span>new() -> io::Result<Selector> { |
| <span class="attribute">#[cfg(not(target_os = <span class="string">"android"</span>))] |
| </span><span class="kw">let </span>res = <span class="macro">syscall!</span>(epoll_create1(libc::EPOLL_CLOEXEC)); |
| |
| <span class="comment">// On Android < API level 16 `epoll_create1` is not defined, so use a |
| // raw system call. |
| // According to libuv, `EPOLL_CLOEXEC` is not defined on Android API < |
| // 21. But `EPOLL_CLOEXEC` is an alias for `O_CLOEXEC` on that platform, |
| // so we use it instead. |
| </span><span class="attribute">#[cfg(target_os = <span class="string">"android"</span>)] |
| </span><span class="kw">let </span>res = <span class="macro">syscall!</span>(syscall(libc::SYS_epoll_create1, libc::O_CLOEXEC)); |
| |
| <span class="kw">let </span>ep = <span class="kw">match </span>res { |
| <span class="prelude-val">Ok</span>(ep) => ep <span class="kw">as </span>RawFd, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="comment">// When `epoll_create1` is not available fall back to use |
| // `epoll_create` followed by `fcntl`. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(libc::ENOSYS) = err.raw_os_error() { |
| <span class="kw">match </span><span class="macro">syscall!</span>(epoll_create(<span class="number">1024</span>)) { |
| <span class="prelude-val">Ok</span>(ep) => <span class="kw">match </span><span class="macro">syscall!</span>(fcntl(ep, libc::F_SETFD, libc::FD_CLOEXEC)) { |
| <span class="prelude-val">Ok</span>(ep) => ep <span class="kw">as </span>RawFd, |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="comment">// `fcntl` failed, cleanup `ep`. |
| </span><span class="kw">let _ </span>= <span class="kw">unsafe </span>{ libc::close(ep) }; |
| <span class="kw">return </span><span class="prelude-val">Err</span>(err); |
| } |
| }, |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err), |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(err); |
| } |
| } |
| }; |
| |
| <span class="prelude-val">Ok</span>(Selector { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>id: NEXT_ID.fetch_add(<span class="number">1</span>, Ordering::Relaxed), |
| ep, |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>has_waker: AtomicBool::new(<span class="bool-val">false</span>), |
| }) |
| } |
| |
| <span class="kw">pub fn </span>try_clone(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<Selector> { |
| <span class="macro">syscall!</span>(fcntl(<span class="self">self</span>.ep, libc::F_DUPFD_CLOEXEC, <span class="kw">super</span>::LOWEST_FD)).map(|ep| Selector { |
| <span class="comment">// It's the same selector, so we use the same id. |
| </span><span class="attribute">#[cfg(debug_assertions)] |
| </span>id: <span class="self">self</span>.id, |
| ep, |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>has_waker: AtomicBool::new(<span class="self">self</span>.has_waker.load(Ordering::Acquire)), |
| }) |
| } |
| |
| <span class="kw">pub fn </span>select(<span class="kw-2">&</span><span class="self">self</span>, events: <span class="kw-2">&mut </span>Events, timeout: <span class="prelude-ty">Option</span><Duration>) -> io::Result<()> { |
| <span class="comment">// A bug in kernels < 2.6.37 makes timeouts larger than LONG_MAX / CONFIG_HZ |
| // (approx. 30 minutes with CONFIG_HZ=1200) effectively infinite on 32 bits |
| // architectures. The magic number is the same constant used by libuv. |
| </span><span class="attribute">#[cfg(target_pointer_width = <span class="string">"32"</span>)] |
| </span><span class="kw">const </span>MAX_SAFE_TIMEOUT: u128 = <span class="number">1789569</span>; |
| <span class="attribute">#[cfg(not(target_pointer_width = <span class="string">"32"</span>))] |
| </span><span class="kw">const </span>MAX_SAFE_TIMEOUT: u128 = libc::c_int::max_value() <span class="kw">as </span>u128; |
| |
| <span class="kw">let </span>timeout = timeout |
| .map(|to| { |
| <span class="comment">// `Duration::as_millis` truncates, so round up. This avoids |
| // turning sub-millisecond timeouts into a zero timeout, unless |
| // the caller explicitly requests that by specifying a zero |
| // timeout. |
| </span><span class="kw">let </span>to_ms = to |
| .checked_add(Duration::from_nanos(<span class="number">999_999</span>)) |
| .unwrap_or(to) |
| .as_millis(); |
| cmp::min(MAX_SAFE_TIMEOUT, to_ms) <span class="kw">as </span>libc::c_int |
| }) |
| .unwrap_or(-<span class="number">1</span>); |
| |
| events.clear(); |
| <span class="macro">syscall!</span>(epoll_wait( |
| <span class="self">self</span>.ep, |
| events.as_mut_ptr(), |
| events.capacity() <span class="kw">as </span>i32, |
| timeout, |
| )) |
| .map(|n_events| { |
| <span class="comment">// This is safe because `epoll_wait` ensures that `n_events` are |
| // assigned. |
| </span><span class="kw">unsafe </span>{ events.set_len(n_events <span class="kw">as </span>usize) }; |
| }) |
| } |
| |
| <span class="kw">pub fn </span>register(<span class="kw-2">&</span><span class="self">self</span>, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>event = libc::epoll_event { |
| events: interests_to_epoll(interests), |
| u64: usize::from(token) <span class="kw">as </span>u64, |
| <span class="attribute">#[cfg(target_os = <span class="string">"redox"</span>)] |
| </span>_pad: <span class="number">0</span>, |
| }; |
| |
| <span class="macro">syscall!</span>(epoll_ctl(<span class="self">self</span>.ep, libc::EPOLL_CTL_ADD, fd, <span class="kw-2">&mut </span>event)).map(|<span class="kw">_</span>| ()) |
| } |
| |
| <span class="kw">pub fn </span>reregister(<span class="kw-2">&</span><span class="self">self</span>, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>event = libc::epoll_event { |
| events: interests_to_epoll(interests), |
| u64: usize::from(token) <span class="kw">as </span>u64, |
| <span class="attribute">#[cfg(target_os = <span class="string">"redox"</span>)] |
| </span>_pad: <span class="number">0</span>, |
| }; |
| |
| <span class="macro">syscall!</span>(epoll_ctl(<span class="self">self</span>.ep, libc::EPOLL_CTL_MOD, fd, <span class="kw-2">&mut </span>event)).map(|<span class="kw">_</span>| ()) |
| } |
| |
| <span class="kw">pub fn </span>deregister(<span class="kw-2">&</span><span class="self">self</span>, fd: RawFd) -> io::Result<()> { |
| <span class="macro">syscall!</span>(epoll_ctl(<span class="self">self</span>.ep, libc::EPOLL_CTL_DEL, fd, ptr::null_mut())).map(|<span class="kw">_</span>| ()) |
| } |
| |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">pub fn </span>register_waker(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.has_waker.swap(<span class="bool-val">true</span>, Ordering::AcqRel) |
| } |
| } |
| |
| <span class="macro">cfg_io_source! </span>{ |
| <span class="kw">impl </span>Selector { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">pub fn </span>id(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.id |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>AsRawFd <span class="kw">for </span>Selector { |
| <span class="kw">fn </span>as_raw_fd(<span class="kw-2">&</span><span class="self">self</span>) -> RawFd { |
| <span class="self">self</span>.ep |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Selector { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = <span class="macro">syscall!</span>(close(<span class="self">self</span>.ep)) { |
| <span class="macro">error!</span>(<span class="string">"error closing epoll: {}"</span>, err); |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>interests_to_epoll(interests: Interest) -> u32 { |
| <span class="kw">let </span><span class="kw-2">mut </span>kind = EPOLLET; |
| |
| <span class="kw">if </span>interests.is_readable() { |
| kind = kind | EPOLLIN | EPOLLRDHUP; |
| } |
| |
| <span class="kw">if </span>interests.is_writable() { |
| kind |= EPOLLOUT; |
| } |
| |
| <span class="kw">if </span>interests.is_priority() { |
| kind |= EPOLLPRI; |
| } |
| |
| kind <span class="kw">as </span>u32 |
| } |
| |
| <span class="kw">pub type </span>Event = libc::epoll_event; |
| <span class="kw">pub type </span>Events = Vec<Event>; |
| |
| <span class="kw">pub mod </span>event { |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::sys::Event; |
| <span class="kw">use </span><span class="kw">crate</span>::Token; |
| |
| <span class="kw">pub fn </span>token(event: <span class="kw-2">&</span>Event) -> Token { |
| Token(event.u64 <span class="kw">as </span>usize) |
| } |
| |
| <span class="kw">pub fn </span>is_readable(event: <span class="kw-2">&</span>Event) -> bool { |
| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLIN) != <span class="number">0 |
| </span>|| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLPRI) != <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>is_writable(event: <span class="kw-2">&</span>Event) -> bool { |
| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLOUT) != <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>is_error(event: <span class="kw-2">&</span>Event) -> bool { |
| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLERR) != <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>is_read_closed(event: <span class="kw-2">&</span>Event) -> bool { |
| <span class="comment">// Both halves of the socket have closed |
| </span>event.events <span class="kw">as </span>libc::c_int & libc::EPOLLHUP != <span class="number">0 |
| </span><span class="comment">// Socket has received FIN or called shutdown(SHUT_RD) |
| </span>|| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLIN != <span class="number">0 |
| </span>&& event.events <span class="kw">as </span>libc::c_int & libc::EPOLLRDHUP != <span class="number">0</span>) |
| } |
| |
| <span class="kw">pub fn </span>is_write_closed(event: <span class="kw-2">&</span>Event) -> bool { |
| <span class="comment">// Both halves of the socket have closed |
| </span>event.events <span class="kw">as </span>libc::c_int & libc::EPOLLHUP != <span class="number">0 |
| </span><span class="comment">// Unix pipe write end has closed |
| </span>|| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLOUT != <span class="number">0 |
| </span>&& event.events <span class="kw">as </span>libc::c_int & libc::EPOLLERR != <span class="number">0</span>) |
| <span class="comment">// The other side (read end) of a Unix pipe has closed. |
| </span>|| event.events <span class="kw">as </span>libc::c_int == libc::EPOLLERR |
| } |
| |
| <span class="kw">pub fn </span>is_priority(event: <span class="kw-2">&</span>Event) -> bool { |
| (event.events <span class="kw">as </span>libc::c_int & libc::EPOLLPRI) != <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>is_aio(<span class="kw">_</span>: <span class="kw-2">&</span>Event) -> bool { |
| <span class="comment">// Not supported in the kernel, only in libc. |
| </span><span class="bool-val">false |
| </span>} |
| |
| <span class="kw">pub fn </span>is_lio(<span class="kw">_</span>: <span class="kw-2">&</span>Event) -> bool { |
| <span class="comment">// Not supported. |
| </span><span class="bool-val">false |
| </span>} |
| |
| <span class="kw">pub fn </span>debug_details(f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>, event: <span class="kw-2">&</span>Event) -> fmt::Result { |
| <span class="attribute">#[allow(clippy::trivially_copy_pass_by_ref)] |
| </span><span class="kw">fn </span>check_events(got: <span class="kw-2">&</span>u32, want: <span class="kw-2">&</span>libc::c_int) -> bool { |
| (<span class="kw-2">*</span>got <span class="kw">as </span>libc::c_int & want) != <span class="number">0 |
| </span>} |
| <span class="macro">debug_detail!</span>( |
| EventsDetails(u32), |
| check_events, |
| libc::EPOLLIN, |
| libc::EPOLLPRI, |
| libc::EPOLLOUT, |
| libc::EPOLLRDNORM, |
| libc::EPOLLRDBAND, |
| libc::EPOLLWRNORM, |
| libc::EPOLLWRBAND, |
| libc::EPOLLMSG, |
| libc::EPOLLERR, |
| libc::EPOLLHUP, |
| libc::EPOLLET, |
| libc::EPOLLRDHUP, |
| libc::EPOLLONESHOT, |
| <span class="attribute">#[cfg(target_os = <span class="string">"linux"</span>)] |
| </span>libc::EPOLLEXCLUSIVE, |
| <span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] |
| </span>libc::EPOLLWAKEUP, |
| libc::EPOLL_CLOEXEC, |
| ); |
| |
| <span class="comment">// Can't reference fields in packed structures. |
| </span><span class="kw">let </span>e_u64 = event.u64; |
| f.debug_struct(<span class="string">"epoll_event"</span>) |
| .field(<span class="string">"events"</span>, <span class="kw-2">&</span>EventsDetails(event.events)) |
| .field(<span class="string">"u64"</span>, <span class="kw-2">&</span>e_u64) |
| .finish() |
| } |
| } |
| |
| <span class="attribute">#[cfg(target_os = <span class="string">"android"</span>)] |
| #[test] |
| </span><span class="kw">fn </span>assert_close_on_exec_flag() { |
| <span class="comment">// This assertion need to be true for Selector::new. |
| </span><span class="macro">assert_eq!</span>(libc::O_CLOEXEC, libc::EPOLL_CLOEXEC); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../../" data-current-crate="mio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
