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<!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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.49.0/src/process/kill.rs`."><title>kill.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../../static.files/storage-e2aeef58.js"></script><script defer src="../../../static.files/src-script-813739b1.js"></script><script defer src="../../../src-files.js"></script><script defer src="../../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">tokio/process/</div>kill.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span>std::io;
<a href=#2 id=2 data-nosnippet>2</a>
<a href=#3 id=3 data-nosnippet>3</a><span class="doccomment">/// An interface for killing a running process.
<a href=#4 id=4 data-nosnippet>4</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Kill {
<a href=#5 id=5 data-nosnippet>5</a> <span class="doccomment">/// Forcefully kills the process.
<a href=#6 id=6 data-nosnippet>6</a> </span><span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt;;
<a href=#7 id=7 data-nosnippet>7</a>}
<a href=#8 id=8 data-nosnippet>8</a>
<a href=#9 id=9 data-nosnippet>9</a><span class="kw">impl</span>&lt;T: Kill&gt; Kill <span class="kw">for </span><span class="kw-2">&amp;mut </span>T {
<a href=#10 id=10 data-nosnippet>10</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#11 id=11 data-nosnippet>11</a> (<span class="kw-2">**</span><span class="self">self</span>).kill()
<a href=#12 id=12 data-nosnippet>12</a> }
<a href=#13 id=13 data-nosnippet>13</a>}
</code></pre></div></section></main></body></html>
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<!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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.49.0/src/process/unix/mod.rs`."><title>mod.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../../../static.files/storage-e2aeef58.js"></script><script defer src="../../../../static.files/src-script-813739b1.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">tokio/process/unix/</div>mod.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Unix handling of child processes.
<a href=#2 id=2 data-nosnippet>2</a>//!
<a href=#3 id=3 data-nosnippet>3</a>//! Right now the only "fancy" thing about this is how we implement the
<a href=#4 id=4 data-nosnippet>4</a>//! `Future` implementation on `Child` to get the exit status. Unix offers
<a href=#5 id=5 data-nosnippet>5</a>//! no way to register a child with epoll, and the only real way to get a
<a href=#6 id=6 data-nosnippet>6</a>//! notification when a process exits is the SIGCHLD signal.
<a href=#7 id=7 data-nosnippet>7</a>//!
<a href=#8 id=8 data-nosnippet>8</a>//! Signal handling in general is *super* hairy and complicated, and it's even
<a href=#9 id=9 data-nosnippet>9</a>//! more complicated here with the fact that signals are coalesced, so we may
<a href=#10 id=10 data-nosnippet>10</a>//! not get a SIGCHLD-per-child.
<a href=#11 id=11 data-nosnippet>11</a>//!
<a href=#12 id=12 data-nosnippet>12</a>//! Our best approximation here is to check *all spawned processes* for all
<a href=#13 id=13 data-nosnippet>13</a>//! SIGCHLD signals received. To do that we create a `Signal`, implemented in
<a href=#14 id=14 data-nosnippet>14</a>//! the `tokio-net` crate, which is a stream over signals being received.
<a href=#15 id=15 data-nosnippet>15</a>//!
<a href=#16 id=16 data-nosnippet>16</a>//! Later when we poll the process's exit status we simply check to see if a
<a href=#17 id=17 data-nosnippet>17</a>//! SIGCHLD has happened since we last checked, and while that returns "yes" we
<a href=#18 id=18 data-nosnippet>18</a>//! keep trying.
<a href=#19 id=19 data-nosnippet>19</a>//!
<a href=#20 id=20 data-nosnippet>20</a>//! Note that this means that this isn't really scalable, but then again
<a href=#21 id=21 data-nosnippet>21</a>//! processes in general aren't scalable (e.g. millions) so it shouldn't be that
<a href=#22 id=22 data-nosnippet>22</a>//! bad in theory...
<a href=#23 id=23 data-nosnippet>23</a>
<a href=#24 id=24 data-nosnippet>24</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>orphan;
<a href=#25 id=25 data-nosnippet>25</a><span class="kw">use </span>orphan::{OrphanQueue, OrphanQueueImpl, Wait};
<a href=#26 id=26 data-nosnippet>26</a>
<a href=#27 id=27 data-nosnippet>27</a><span class="kw">mod </span>reap;
<a href=#28 id=28 data-nosnippet>28</a><span class="kw">use </span>reap::Reaper;
<a href=#29 id=29 data-nosnippet>29</a>
<a href=#30 id=30 data-nosnippet>30</a><span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#31 id=31 data-nosnippet>31</a></span><span class="kw">mod </span>pidfd_reaper;
<a href=#32 id=32 data-nosnippet>32</a>
<a href=#33 id=33 data-nosnippet>33</a><span class="kw">use </span><span class="kw">crate</span>::io::{AsyncRead, AsyncWrite, PollEvented, ReadBuf};
<a href=#34 id=34 data-nosnippet>34</a><span class="kw">use </span><span class="kw">crate</span>::process::kill::Kill;
<a href=#35 id=35 data-nosnippet>35</a><span class="kw">use </span><span class="kw">crate</span>::process::SpawnedChild;
<a href=#36 id=36 data-nosnippet>36</a><span class="kw">use </span><span class="kw">crate</span>::runtime::signal::Handle <span class="kw">as </span>SignalHandle;
<a href=#37 id=37 data-nosnippet>37</a><span class="kw">use </span><span class="kw">crate</span>::signal::unix::{signal, Signal, SignalKind};
<a href=#38 id=38 data-nosnippet>38</a>
<a href=#39 id=39 data-nosnippet>39</a><span class="kw">use </span>mio::event::Source;
<a href=#40 id=40 data-nosnippet>40</a><span class="kw">use </span>mio::unix::SourceFd;
<a href=#41 id=41 data-nosnippet>41</a><span class="kw">use </span>std::fmt;
<a href=#42 id=42 data-nosnippet>42</a><span class="kw">use </span>std::fs::File;
<a href=#43 id=43 data-nosnippet>43</a><span class="kw">use </span>std::future::Future;
<a href=#44 id=44 data-nosnippet>44</a><span class="kw">use </span>std::io;
<a href=#45 id=45 data-nosnippet>45</a><span class="kw">use </span>std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
<a href=#46 id=46 data-nosnippet>46</a><span class="kw">use </span>std::pin::Pin;
<a href=#47 id=47 data-nosnippet>47</a><span class="kw">use </span>std::process::{Child <span class="kw">as </span>StdChild, ExitStatus, Stdio};
<a href=#48 id=48 data-nosnippet>48</a><span class="kw">use </span>std::task::Context;
<a href=#49 id=49 data-nosnippet>49</a><span class="kw">use </span>std::task::Poll;
<a href=#50 id=50 data-nosnippet>50</a>
<a href=#51 id=51 data-nosnippet>51</a><span class="kw">impl </span>Wait <span class="kw">for </span>StdChild {
<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<a href=#53 id=53 data-nosnippet>53</a> <span class="self">self</span>.id()
<a href=#54 id=54 data-nosnippet>54</a> }
<a href=#55 id=55 data-nosnippet>55</a>
<a href=#56 id=56 data-nosnippet>56</a> <span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt; {
<a href=#57 id=57 data-nosnippet>57</a> <span class="self">self</span>.try_wait()
<a href=#58 id=58 data-nosnippet>58</a> }
<a href=#59 id=59 data-nosnippet>59</a>}
<a href=#60 id=60 data-nosnippet>60</a>
<a href=#61 id=61 data-nosnippet>61</a><span class="kw">impl </span>Kill <span class="kw">for </span>StdChild {
<a href=#62 id=62 data-nosnippet>62</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#63 id=63 data-nosnippet>63</a> <span class="self">self</span>.kill()
<a href=#64 id=64 data-nosnippet>64</a> }
<a href=#65 id=65 data-nosnippet>65</a>}
<a href=#66 id=66 data-nosnippet>66</a>
<a href=#67 id=67 data-nosnippet>67</a><span class="macro">cfg_not_has_const_mutex_new!</span> {
<a href=#68 id=68 data-nosnippet>68</a> <span class="kw">fn </span>get_orphan_queue() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">'static </span>OrphanQueueImpl&lt;StdChild&gt; {
<a href=#69 id=69 data-nosnippet>69</a> <span class="kw">use </span>std::sync::OnceLock;
<a href=#70 id=70 data-nosnippet>70</a>
<a href=#71 id=71 data-nosnippet>71</a> <span class="kw">static </span>ORPHAN_QUEUE: OnceLock&lt;OrphanQueueImpl&lt;StdChild&gt;&gt; = OnceLock::new();
<a href=#72 id=72 data-nosnippet>72</a>
<a href=#73 id=73 data-nosnippet>73</a> ORPHAN_QUEUE.get_or_init(OrphanQueueImpl::new)
<a href=#74 id=74 data-nosnippet>74</a> }
<a href=#75 id=75 data-nosnippet>75</a>}
<a href=#76 id=76 data-nosnippet>76</a>
<a href=#77 id=77 data-nosnippet>77</a><span class="macro">cfg_has_const_mutex_new!</span> {
<a href=#78 id=78 data-nosnippet>78</a> <span class="kw">fn </span>get_orphan_queue() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">'static </span>OrphanQueueImpl&lt;StdChild&gt; {
<a href=#79 id=79 data-nosnippet>79</a> <span class="kw">static </span>ORPHAN_QUEUE: OrphanQueueImpl&lt;StdChild&gt; = OrphanQueueImpl::new();
<a href=#80 id=80 data-nosnippet>80</a>
<a href=#81 id=81 data-nosnippet>81</a> <span class="kw-2">&amp;</span>ORPHAN_QUEUE
<a href=#82 id=82 data-nosnippet>82</a> }
<a href=#83 id=83 data-nosnippet>83</a>}
<a href=#84 id=84 data-nosnippet>84</a>
<a href=#85 id=85 data-nosnippet>85</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>GlobalOrphanQueue;
<a href=#86 id=86 data-nosnippet>86</a>
<a href=#87 id=87 data-nosnippet>87</a><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>GlobalOrphanQueue {
<a href=#88 id=88 data-nosnippet>88</a> <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">'_</span>&gt;) -&gt; fmt::Result {
<a href=#89 id=89 data-nosnippet>89</a> get_orphan_queue().fmt(fmt)
<a href=#90 id=90 data-nosnippet>90</a> }
<a href=#91 id=91 data-nosnippet>91</a>}
<a href=#92 id=92 data-nosnippet>92</a>
<a href=#93 id=93 data-nosnippet>93</a><span class="kw">impl </span>GlobalOrphanQueue {
<a href=#94 id=94 data-nosnippet>94</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>reap_orphans(handle: <span class="kw-2">&amp;</span>SignalHandle) {
<a href=#95 id=95 data-nosnippet>95</a> get_orphan_queue().reap_orphans(handle);
<a href=#96 id=96 data-nosnippet>96</a> }
<a href=#97 id=97 data-nosnippet>97</a>}
<a href=#98 id=98 data-nosnippet>98</a>
<a href=#99 id=99 data-nosnippet>99</a><span class="kw">impl </span>OrphanQueue&lt;StdChild&gt; <span class="kw">for </span>GlobalOrphanQueue {
<a href=#100 id=100 data-nosnippet>100</a> <span class="kw">fn </span>push_orphan(<span class="kw-2">&amp;</span><span class="self">self</span>, orphan: StdChild) {
<a href=#101 id=101 data-nosnippet>101</a> get_orphan_queue().push_orphan(orphan);
<a href=#102 id=102 data-nosnippet>102</a> }
<a href=#103 id=103 data-nosnippet>103</a>}
<a href=#104 id=104 data-nosnippet>104</a>
<a href=#105 id=105 data-nosnippet>105</a><span class="attr">#[must_use = <span class="string">"futures do nothing unless polled"</span>]
<a href=#106 id=106 data-nosnippet>106</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Child {
<a href=#107 id=107 data-nosnippet>107</a> SignalReaper(Reaper&lt;StdChild, GlobalOrphanQueue, Signal&gt;),
<a href=#108 id=108 data-nosnippet>108</a> <span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#109 id=109 data-nosnippet>109</a> </span>PidfdReaper(pidfd_reaper::PidfdReaper&lt;StdChild, GlobalOrphanQueue&gt;),
<a href=#110 id=110 data-nosnippet>110</a>}
<a href=#111 id=111 data-nosnippet>111</a>
<a href=#112 id=112 data-nosnippet>112</a><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Child {
<a href=#113 id=113 data-nosnippet>113</a> <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">'_</span>&gt;) -&gt; fmt::Result {
<a href=#114 id=114 data-nosnippet>114</a> fmt.debug_struct(<span class="string">"Child"</span>).field(<span class="string">"pid"</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.id()).finish()
<a href=#115 id=115 data-nosnippet>115</a> }
<a href=#116 id=116 data-nosnippet>116</a>}
<a href=#117 id=117 data-nosnippet>117</a>
<a href=#118 id=118 data-nosnippet>118</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>build_child(<span class="kw-2">mut </span>child: StdChild) -&gt; io::Result&lt;SpawnedChild&gt; {
<a href=#119 id=119 data-nosnippet>119</a> <span class="kw">let </span>stdin = child.stdin.take().map(stdio).transpose()<span class="question-mark">?</span>;
<a href=#120 id=120 data-nosnippet>120</a> <span class="kw">let </span>stdout = child.stdout.take().map(stdio).transpose()<span class="question-mark">?</span>;
<a href=#121 id=121 data-nosnippet>121</a> <span class="kw">let </span>stderr = child.stderr.take().map(stdio).transpose()<span class="question-mark">?</span>;
<a href=#122 id=122 data-nosnippet>122</a>
<a href=#123 id=123 data-nosnippet>123</a> <span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#124 id=124 data-nosnippet>124</a> </span><span class="kw">match </span>pidfd_reaper::PidfdReaper::new(child, GlobalOrphanQueue) {
<a href=#125 id=125 data-nosnippet>125</a> <span class="prelude-val">Ok</span>(pidfd_reaper) =&gt; {
<a href=#126 id=126 data-nosnippet>126</a> <span class="kw">return </span><span class="prelude-val">Ok</span>(SpawnedChild {
<a href=#127 id=127 data-nosnippet>127</a> child: Child::PidfdReaper(pidfd_reaper),
<a href=#128 id=128 data-nosnippet>128</a> stdin,
<a href=#129 id=129 data-nosnippet>129</a> stdout,
<a href=#130 id=130 data-nosnippet>130</a> stderr,
<a href=#131 id=131 data-nosnippet>131</a> })
<a href=#132 id=132 data-nosnippet>132</a> }
<a href=#133 id=133 data-nosnippet>133</a> <span class="prelude-val">Err</span>((<span class="prelude-val">Some</span>(err), _child)) =&gt; <span class="kw">return </span><span class="prelude-val">Err</span>(err),
<a href=#134 id=134 data-nosnippet>134</a> <span class="prelude-val">Err</span>((<span class="prelude-val">None</span>, child_returned)) =&gt; child = child_returned,
<a href=#135 id=135 data-nosnippet>135</a> }
<a href=#136 id=136 data-nosnippet>136</a>
<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">let </span>signal = signal(SignalKind::child())<span class="question-mark">?</span>;
<a href=#138 id=138 data-nosnippet>138</a>
<a href=#139 id=139 data-nosnippet>139</a> <span class="prelude-val">Ok</span>(SpawnedChild {
<a href=#140 id=140 data-nosnippet>140</a> child: Child::SignalReaper(Reaper::new(child, GlobalOrphanQueue, signal)),
<a href=#141 id=141 data-nosnippet>141</a> stdin,
<a href=#142 id=142 data-nosnippet>142</a> stdout,
<a href=#143 id=143 data-nosnippet>143</a> stderr,
<a href=#144 id=144 data-nosnippet>144</a> })
<a href=#145 id=145 data-nosnippet>145</a>}
<a href=#146 id=146 data-nosnippet>146</a>
<a href=#147 id=147 data-nosnippet>147</a><span class="kw">impl </span>Child {
<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<a href=#149 id=149 data-nosnippet>149</a> <span class="kw">match </span><span class="self">self </span>{
<a href=#150 id=150 data-nosnippet>150</a> <span class="self">Self</span>::SignalReaper(signal_reaper) =&gt; signal_reaper.id(),
<a href=#151 id=151 data-nosnippet>151</a> <span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#152 id=152 data-nosnippet>152</a> </span><span class="self">Self</span>::PidfdReaper(pidfd_reaper) =&gt; pidfd_reaper.id(),
<a href=#153 id=153 data-nosnippet>153</a> }
<a href=#154 id=154 data-nosnippet>154</a> }
<a href=#155 id=155 data-nosnippet>155</a>
<a href=#156 id=156 data-nosnippet>156</a> <span class="kw">fn </span>std_child(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>StdChild {
<a href=#157 id=157 data-nosnippet>157</a> <span class="kw">match </span><span class="self">self </span>{
<a href=#158 id=158 data-nosnippet>158</a> <span class="self">Self</span>::SignalReaper(signal_reaper) =&gt; signal_reaper.inner_mut(),
<a href=#159 id=159 data-nosnippet>159</a> <span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#160 id=160 data-nosnippet>160</a> </span><span class="self">Self</span>::PidfdReaper(pidfd_reaper) =&gt; pidfd_reaper.inner_mut(),
<a href=#161 id=161 data-nosnippet>161</a> }
<a href=#162 id=162 data-nosnippet>162</a> }
<a href=#163 id=163 data-nosnippet>163</a>
<a href=#164 id=164 data-nosnippet>164</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt; {
<a href=#165 id=165 data-nosnippet>165</a> <span class="self">self</span>.std_child().try_wait()
<a href=#166 id=166 data-nosnippet>166</a> }
<a href=#167 id=167 data-nosnippet>167</a>}
<a href=#168 id=168 data-nosnippet>168</a>
<a href=#169 id=169 data-nosnippet>169</a><span class="kw">impl </span>Kill <span class="kw">for </span>Child {
<a href=#170 id=170 data-nosnippet>170</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#171 id=171 data-nosnippet>171</a> <span class="self">self</span>.std_child().kill()
<a href=#172 id=172 data-nosnippet>172</a> }
<a href=#173 id=173 data-nosnippet>173</a>}
<a href=#174 id=174 data-nosnippet>174</a>
<a href=#175 id=175 data-nosnippet>175</a><span class="kw">impl </span>Future <span class="kw">for </span>Child {
<a href=#176 id=176 data-nosnippet>176</a> <span class="kw">type </span>Output = io::Result&lt;ExitStatus&gt;;
<a href=#177 id=177 data-nosnippet>177</a>
<a href=#178 id=178 data-nosnippet>178</a> <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
<a href=#179 id=179 data-nosnippet>179</a> <span class="kw">match </span>Pin::into_inner(<span class="self">self</span>) {
<a href=#180 id=180 data-nosnippet>180</a> <span class="self">Self</span>::SignalReaper(signal_reaper) =&gt; Pin::new(signal_reaper).poll(cx),
<a href=#181 id=181 data-nosnippet>181</a> <span class="attr">#[cfg(all(target_os = <span class="string">"linux"</span>, feature = <span class="string">"rt"</span>))]
<a href=#182 id=182 data-nosnippet>182</a> </span><span class="self">Self</span>::PidfdReaper(pidfd_reaper) =&gt; Pin::new(pidfd_reaper).poll(cx),
<a href=#183 id=183 data-nosnippet>183</a> }
<a href=#184 id=184 data-nosnippet>184</a> }
<a href=#185 id=185 data-nosnippet>185</a>}
<a href=#186 id=186 data-nosnippet>186</a>
<a href=#187 id=187 data-nosnippet>187</a><span class="attr">#[derive(Debug)]
<a href=#188 id=188 data-nosnippet>188</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Pipe {
<a href=#189 id=189 data-nosnippet>189</a> <span class="comment">// Actually a pipe is not a File. However, we are reusing `File` to get
<a href=#190 id=190 data-nosnippet>190</a> // close on drop. This is a similar trick as `mio`.
<a href=#191 id=191 data-nosnippet>191</a> </span>fd: File,
<a href=#192 id=192 data-nosnippet>192</a>}
<a href=#193 id=193 data-nosnippet>193</a>
<a href=#194 id=194 data-nosnippet>194</a><span class="kw">impl</span>&lt;T: IntoRawFd&gt; From&lt;T&gt; <span class="kw">for </span>Pipe {
<a href=#195 id=195 data-nosnippet>195</a> <span class="kw">fn </span>from(fd: T) -&gt; <span class="self">Self </span>{
<a href=#196 id=196 data-nosnippet>196</a> <span class="kw">let </span>fd = <span class="kw">unsafe </span>{ File::from_raw_fd(fd.into_raw_fd()) };
<a href=#197 id=197 data-nosnippet>197</a> <span class="self">Self </span>{ fd }
<a href=#198 id=198 data-nosnippet>198</a> }
<a href=#199 id=199 data-nosnippet>199</a>}
<a href=#200 id=200 data-nosnippet>200</a>
<a href=#201 id=201 data-nosnippet>201</a><span class="kw">impl </span>io::Read <span class="kw">for </span><span class="kw-2">&amp;</span>Pipe {
<a href=#202 id=202 data-nosnippet>202</a> <span class="kw">fn </span>read(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;mut </span>[u8]) -&gt; io::Result&lt;usize&gt; {
<a href=#203 id=203 data-nosnippet>203</a> (<span class="kw-2">&amp;</span><span class="self">self</span>.fd).read(bytes)
<a href=#204 id=204 data-nosnippet>204</a> }
<a href=#205 id=205 data-nosnippet>205</a>}
<a href=#206 id=206 data-nosnippet>206</a>
<a href=#207 id=207 data-nosnippet>207</a><span class="kw">impl </span>io::Write <span class="kw">for </span><span class="kw-2">&amp;</span>Pipe {
<a href=#208 id=208 data-nosnippet>208</a> <span class="kw">fn </span>write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; io::Result&lt;usize&gt; {
<a href=#209 id=209 data-nosnippet>209</a> (<span class="kw-2">&amp;</span><span class="self">self</span>.fd).write(bytes)
<a href=#210 id=210 data-nosnippet>210</a> }
<a href=#211 id=211 data-nosnippet>211</a>
<a href=#212 id=212 data-nosnippet>212</a> <span class="kw">fn </span>flush(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#213 id=213 data-nosnippet>213</a> (<span class="kw-2">&amp;</span><span class="self">self</span>.fd).flush()
<a href=#214 id=214 data-nosnippet>214</a> }
<a href=#215 id=215 data-nosnippet>215</a>
<a href=#216 id=216 data-nosnippet>216</a> <span class="kw">fn </span>write_vectored(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bufs: <span class="kw-2">&amp;</span>[io::IoSlice&lt;<span class="lifetime">'_</span>&gt;]) -&gt; io::Result&lt;usize&gt; {
<a href=#217 id=217 data-nosnippet>217</a> (<span class="kw-2">&amp;</span><span class="self">self</span>.fd).write_vectored(bufs)
<a href=#218 id=218 data-nosnippet>218</a> }
<a href=#219 id=219 data-nosnippet>219</a>}
<a href=#220 id=220 data-nosnippet>220</a>
<a href=#221 id=221 data-nosnippet>221</a><span class="kw">impl </span>AsRawFd <span class="kw">for </span>Pipe {
<a href=#222 id=222 data-nosnippet>222</a> <span class="kw">fn </span>as_raw_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RawFd {
<a href=#223 id=223 data-nosnippet>223</a> <span class="self">self</span>.fd.as_raw_fd()
<a href=#224 id=224 data-nosnippet>224</a> }
<a href=#225 id=225 data-nosnippet>225</a>}
<a href=#226 id=226 data-nosnippet>226</a>
<a href=#227 id=227 data-nosnippet>227</a><span class="kw">impl </span>AsFd <span class="kw">for </span>Pipe {
<a href=#228 id=228 data-nosnippet>228</a> <span class="kw">fn </span>as_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; BorrowedFd&lt;<span class="lifetime">'_</span>&gt; {
<a href=#229 id=229 data-nosnippet>229</a> <span class="kw">unsafe </span>{ BorrowedFd::borrow_raw(<span class="self">self</span>.as_raw_fd()) }
<a href=#230 id=230 data-nosnippet>230</a> }
<a href=#231 id=231 data-nosnippet>231</a>}
<a href=#232 id=232 data-nosnippet>232</a>
<a href=#233 id=233 data-nosnippet>233</a><span class="kw">fn </span>convert_to_blocking_file(io: ChildStdio) -&gt; io::Result&lt;File&gt; {
<a href=#234 id=234 data-nosnippet>234</a> <span class="kw">let </span><span class="kw-2">mut </span>fd = io.inner.into_inner()<span class="question-mark">?</span>.fd;
<a href=#235 id=235 data-nosnippet>235</a>
<a href=#236 id=236 data-nosnippet>236</a> <span class="comment">// Ensure that the fd to be inherited is set to *blocking* mode, as this
<a href=#237 id=237 data-nosnippet>237</a> // is the default that virtually all programs expect to have. Those
<a href=#238 id=238 data-nosnippet>238</a> // programs that know how to work with nonblocking stdio will know how to
<a href=#239 id=239 data-nosnippet>239</a> // change it to nonblocking mode.
<a href=#240 id=240 data-nosnippet>240</a> </span>set_nonblocking(<span class="kw-2">&amp;mut </span>fd, <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<a href=#241 id=241 data-nosnippet>241</a>
<a href=#242 id=242 data-nosnippet>242</a> <span class="prelude-val">Ok</span>(fd)
<a href=#243 id=243 data-nosnippet>243</a>}
<a href=#244 id=244 data-nosnippet>244</a>
<a href=#245 id=245 data-nosnippet>245</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>convert_to_stdio(io: ChildStdio) -&gt; io::Result&lt;Stdio&gt; {
<a href=#246 id=246 data-nosnippet>246</a> convert_to_blocking_file(io).map(Stdio::from)
<a href=#247 id=247 data-nosnippet>247</a>}
<a href=#248 id=248 data-nosnippet>248</a>
<a href=#249 id=249 data-nosnippet>249</a><span class="kw">impl </span>Source <span class="kw">for </span>Pipe {
<a href=#250 id=250 data-nosnippet>250</a> <span class="kw">fn </span>register(
<a href=#251 id=251 data-nosnippet>251</a> <span class="kw-2">&amp;mut </span><span class="self">self</span>,
<a href=#252 id=252 data-nosnippet>252</a> registry: <span class="kw-2">&amp;</span>mio::Registry,
<a href=#253 id=253 data-nosnippet>253</a> token: mio::Token,
<a href=#254 id=254 data-nosnippet>254</a> interest: mio::Interest,
<a href=#255 id=255 data-nosnippet>255</a> ) -&gt; io::Result&lt;()&gt; {
<a href=#256 id=256 data-nosnippet>256</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).register(registry, token, interest)
<a href=#257 id=257 data-nosnippet>257</a> }
<a href=#258 id=258 data-nosnippet>258</a>
<a href=#259 id=259 data-nosnippet>259</a> <span class="kw">fn </span>reregister(
<a href=#260 id=260 data-nosnippet>260</a> <span class="kw-2">&amp;mut </span><span class="self">self</span>,
<a href=#261 id=261 data-nosnippet>261</a> registry: <span class="kw-2">&amp;</span>mio::Registry,
<a href=#262 id=262 data-nosnippet>262</a> token: mio::Token,
<a href=#263 id=263 data-nosnippet>263</a> interest: mio::Interest,
<a href=#264 id=264 data-nosnippet>264</a> ) -&gt; io::Result&lt;()&gt; {
<a href=#265 id=265 data-nosnippet>265</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).reregister(registry, token, interest)
<a href=#266 id=266 data-nosnippet>266</a> }
<a href=#267 id=267 data-nosnippet>267</a>
<a href=#268 id=268 data-nosnippet>268</a> <span class="kw">fn </span>deregister(<span class="kw-2">&amp;mut </span><span class="self">self</span>, registry: <span class="kw-2">&amp;</span>mio::Registry) -&gt; io::Result&lt;()&gt; {
<a href=#269 id=269 data-nosnippet>269</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).deregister(registry)
<a href=#270 id=270 data-nosnippet>270</a> }
<a href=#271 id=271 data-nosnippet>271</a>}
<a href=#272 id=272 data-nosnippet>272</a>
<a href=#273 id=273 data-nosnippet>273</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>ChildStdio {
<a href=#274 id=274 data-nosnippet>274</a> inner: PollEvented&lt;Pipe&gt;,
<a href=#275 id=275 data-nosnippet>275</a>}
<a href=#276 id=276 data-nosnippet>276</a>
<a href=#277 id=277 data-nosnippet>277</a><span class="kw">impl </span>ChildStdio {
<a href=#278 id=278 data-nosnippet>278</a> <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_owned_fd(<span class="self">self</span>) -&gt; io::Result&lt;OwnedFd&gt; {
<a href=#279 id=279 data-nosnippet>279</a> convert_to_blocking_file(<span class="self">self</span>).map(OwnedFd::from)
<a href=#280 id=280 data-nosnippet>280</a> }
<a href=#281 id=281 data-nosnippet>281</a>}
<a href=#282 id=282 data-nosnippet>282</a>
<a href=#283 id=283 data-nosnippet>283</a><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ChildStdio {
<a href=#284 id=284 data-nosnippet>284</a> <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">'_</span>&gt;) -&gt; fmt::Result {
<a href=#285 id=285 data-nosnippet>285</a> <span class="self">self</span>.inner.fmt(fmt)
<a href=#286 id=286 data-nosnippet>286</a> }
<a href=#287 id=287 data-nosnippet>287</a>}
<a href=#288 id=288 data-nosnippet>288</a>
<a href=#289 id=289 data-nosnippet>289</a><span class="kw">impl </span>AsRawFd <span class="kw">for </span>ChildStdio {
<a href=#290 id=290 data-nosnippet>290</a> <span class="kw">fn </span>as_raw_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RawFd {
<a href=#291 id=291 data-nosnippet>291</a> <span class="self">self</span>.inner.as_raw_fd()
<a href=#292 id=292 data-nosnippet>292</a> }
<a href=#293 id=293 data-nosnippet>293</a>}
<a href=#294 id=294 data-nosnippet>294</a>
<a href=#295 id=295 data-nosnippet>295</a><span class="kw">impl </span>AsFd <span class="kw">for </span>ChildStdio {
<a href=#296 id=296 data-nosnippet>296</a> <span class="kw">fn </span>as_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; BorrowedFd&lt;<span class="lifetime">'_</span>&gt; {
<a href=#297 id=297 data-nosnippet>297</a> <span class="kw">unsafe </span>{ BorrowedFd::borrow_raw(<span class="self">self</span>.as_raw_fd()) }
<a href=#298 id=298 data-nosnippet>298</a> }
<a href=#299 id=299 data-nosnippet>299</a>}
<a href=#300 id=300 data-nosnippet>300</a>
<a href=#301 id=301 data-nosnippet>301</a><span class="kw">impl </span>AsyncWrite <span class="kw">for </span>ChildStdio {
<a href=#302 id=302 data-nosnippet>302</a> <span class="kw">fn </span>poll_write(
<a href=#303 id=303 data-nosnippet>303</a> <span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;,
<a href=#304 id=304 data-nosnippet>304</a> cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;,
<a href=#305 id=305 data-nosnippet>305</a> buf: <span class="kw-2">&amp;</span>[u8],
<a href=#306 id=306 data-nosnippet>306</a> ) -&gt; Poll&lt;io::Result&lt;usize&gt;&gt; {
<a href=#307 id=307 data-nosnippet>307</a> <span class="self">self</span>.inner.poll_write(cx, buf)
<a href=#308 id=308 data-nosnippet>308</a> }
<a href=#309 id=309 data-nosnippet>309</a>
<a href=#310 id=310 data-nosnippet>310</a> <span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, _cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
<a href=#311 id=311 data-nosnippet>311</a> Poll::Ready(<span class="prelude-val">Ok</span>(()))
<a href=#312 id=312 data-nosnippet>312</a> }
<a href=#313 id=313 data-nosnippet>313</a>
<a href=#314 id=314 data-nosnippet>314</a> <span class="kw">fn </span>poll_shutdown(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, _cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
<a href=#315 id=315 data-nosnippet>315</a> Poll::Ready(<span class="prelude-val">Ok</span>(()))
<a href=#316 id=316 data-nosnippet>316</a> }
<a href=#317 id=317 data-nosnippet>317</a>
<a href=#318 id=318 data-nosnippet>318</a> <span class="kw">fn </span>poll_write_vectored(
<a href=#319 id=319 data-nosnippet>319</a> <span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;,
<a href=#320 id=320 data-nosnippet>320</a> cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;,
<a href=#321 id=321 data-nosnippet>321</a> bufs: <span class="kw-2">&amp;</span>[io::IoSlice&lt;<span class="lifetime">'_</span>&gt;],
<a href=#322 id=322 data-nosnippet>322</a> ) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;usize, io::Error&gt;&gt; {
<a href=#323 id=323 data-nosnippet>323</a> <span class="self">self</span>.inner.poll_write_vectored(cx, bufs)
<a href=#324 id=324 data-nosnippet>324</a> }
<a href=#325 id=325 data-nosnippet>325</a>
<a href=#326 id=326 data-nosnippet>326</a> <span class="kw">fn </span>is_write_vectored(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<a href=#327 id=327 data-nosnippet>327</a> <span class="bool-val">true
<a href=#328 id=328 data-nosnippet>328</a> </span>}
<a href=#329 id=329 data-nosnippet>329</a>}
<a href=#330 id=330 data-nosnippet>330</a>
<a href=#331 id=331 data-nosnippet>331</a><span class="kw">impl </span>AsyncRead <span class="kw">for </span>ChildStdio {
<a href=#332 id=332 data-nosnippet>332</a> <span class="kw">fn </span>poll_read(
<a href=#333 id=333 data-nosnippet>333</a> <span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;,
<a href=#334 id=334 data-nosnippet>334</a> cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;,
<a href=#335 id=335 data-nosnippet>335</a> buf: <span class="kw-2">&amp;mut </span>ReadBuf&lt;<span class="lifetime">'_</span>&gt;,
<a href=#336 id=336 data-nosnippet>336</a> ) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
<a href=#337 id=337 data-nosnippet>337</a> <span class="comment">// Safety: pipes support reading into uninitialized memory
<a href=#338 id=338 data-nosnippet>338</a> </span><span class="kw">unsafe </span>{ <span class="self">self</span>.inner.poll_read(cx, buf) }
<a href=#339 id=339 data-nosnippet>339</a> }
<a href=#340 id=340 data-nosnippet>340</a>}
<a href=#341 id=341 data-nosnippet>341</a>
<a href=#342 id=342 data-nosnippet>342</a><span class="kw">fn </span>set_nonblocking&lt;T: AsRawFd&gt;(fd: <span class="kw-2">&amp;mut </span>T, nonblocking: bool) -&gt; io::Result&lt;()&gt; {
<a href=#343 id=343 data-nosnippet>343</a> <span class="kw">unsafe </span>{
<a href=#344 id=344 data-nosnippet>344</a> <span class="kw">let </span>fd = fd.as_raw_fd();
<a href=#345 id=345 data-nosnippet>345</a> <span class="kw">let </span>previous = libc::fcntl(fd, libc::F_GETFL);
<a href=#346 id=346 data-nosnippet>346</a> <span class="kw">if </span>previous == -<span class="number">1 </span>{
<a href=#347 id=347 data-nosnippet>347</a> <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::last_os_error());
<a href=#348 id=348 data-nosnippet>348</a> }
<a href=#349 id=349 data-nosnippet>349</a>
<a href=#350 id=350 data-nosnippet>350</a> <span class="kw">let </span>new = <span class="kw">if </span>nonblocking {
<a href=#351 id=351 data-nosnippet>351</a> previous | libc::O_NONBLOCK
<a href=#352 id=352 data-nosnippet>352</a> } <span class="kw">else </span>{
<a href=#353 id=353 data-nosnippet>353</a> previous &amp; !libc::O_NONBLOCK
<a href=#354 id=354 data-nosnippet>354</a> };
<a href=#355 id=355 data-nosnippet>355</a>
<a href=#356 id=356 data-nosnippet>356</a> <span class="kw">let </span>r = libc::fcntl(fd, libc::F_SETFL, new);
<a href=#357 id=357 data-nosnippet>357</a> <span class="kw">if </span>r == -<span class="number">1 </span>{
<a href=#358 id=358 data-nosnippet>358</a> <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::last_os_error());
<a href=#359 id=359 data-nosnippet>359</a> }
<a href=#360 id=360 data-nosnippet>360</a> }
<a href=#361 id=361 data-nosnippet>361</a>
<a href=#362 id=362 data-nosnippet>362</a> <span class="prelude-val">Ok</span>(())
<a href=#363 id=363 data-nosnippet>363</a>}
<a href=#364 id=364 data-nosnippet>364</a>
<a href=#365 id=365 data-nosnippet>365</a><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>stdio&lt;T&gt;(io: T) -&gt; io::Result&lt;ChildStdio&gt;
<a href=#366 id=366 data-nosnippet>366</a><span class="kw">where
<a href=#367 id=367 data-nosnippet>367</a> </span>T: IntoRawFd,
<a href=#368 id=368 data-nosnippet>368</a>{
<a href=#369 id=369 data-nosnippet>369</a> <span class="comment">// Set the fd to nonblocking before we pass it to the event loop
<a href=#370 id=370 data-nosnippet>370</a> </span><span class="kw">let </span><span class="kw-2">mut </span>pipe = Pipe::from(io);
<a href=#371 id=371 data-nosnippet>371</a> set_nonblocking(<span class="kw-2">&amp;mut </span>pipe, <span class="bool-val">true</span>)<span class="question-mark">?</span>;
<a href=#372 id=372 data-nosnippet>372</a>
<a href=#373 id=373 data-nosnippet>373</a> PollEvented::new(pipe).map(|inner| ChildStdio { inner })
<a href=#374 id=374 data-nosnippet>374</a>}
</code></pre></div></section></main></body></html>
@@ -0,0 +1,335 @@
<!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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.49.0/src/process/unix/orphan.rs`."><title>orphan.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../../../static.files/storage-e2aeef58.js"></script><script defer src="../../../../static.files/src-script-813739b1.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">tokio/process/unix/</div>orphan.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span><span class="kw">crate</span>::loom::sync::{Mutex, MutexGuard};
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span><span class="kw">crate</span>::runtime::signal::Handle <span class="kw">as </span>SignalHandle;
<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span><span class="kw">crate</span>::signal::unix::{signal_with_handle, SignalKind};
<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span><span class="kw">crate</span>::sync::watch;
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>std::io;
<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>std::process::ExitStatus;
<a href=#7 id=7 data-nosnippet>7</a>
<a href=#8 id=8 data-nosnippet>8</a><span class="doccomment">/// An interface for waiting on a process to exit.
<a href=#9 id=9 data-nosnippet>9</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Wait {
<a href=#10 id=10 data-nosnippet>10</a> <span class="doccomment">/// Get the identifier for this process or diagnostics.
<a href=#11 id=11 data-nosnippet>11</a> </span><span class="attr">#[allow(dead_code)]
<a href=#12 id=12 data-nosnippet>12</a> </span><span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32;
<a href=#13 id=13 data-nosnippet>13</a> <span class="doccomment">/// Try waiting for a process to exit in a non-blocking manner.
<a href=#14 id=14 data-nosnippet>14</a> </span><span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt;;
<a href=#15 id=15 data-nosnippet>15</a>}
<a href=#16 id=16 data-nosnippet>16</a>
<a href=#17 id=17 data-nosnippet>17</a><span class="kw">impl</span>&lt;T: Wait&gt; Wait <span class="kw">for </span><span class="kw-2">&amp;mut </span>T {
<a href=#18 id=18 data-nosnippet>18</a> <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<a href=#19 id=19 data-nosnippet>19</a> (<span class="kw-2">**</span><span class="self">self</span>).id()
<a href=#20 id=20 data-nosnippet>20</a> }
<a href=#21 id=21 data-nosnippet>21</a>
<a href=#22 id=22 data-nosnippet>22</a> <span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt; {
<a href=#23 id=23 data-nosnippet>23</a> (<span class="kw-2">**</span><span class="self">self</span>).try_wait()
<a href=#24 id=24 data-nosnippet>24</a> }
<a href=#25 id=25 data-nosnippet>25</a>}
<a href=#26 id=26 data-nosnippet>26</a>
<a href=#27 id=27 data-nosnippet>27</a><span class="doccomment">/// An interface for queueing up an orphaned process so that it can be reaped.
<a href=#28 id=28 data-nosnippet>28</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>OrphanQueue&lt;T&gt; {
<a href=#29 id=29 data-nosnippet>29</a> <span class="doccomment">/// Adds an orphan to the queue.
<a href=#30 id=30 data-nosnippet>30</a> </span><span class="kw">fn </span>push_orphan(<span class="kw-2">&amp;</span><span class="self">self</span>, orphan: T);
<a href=#31 id=31 data-nosnippet>31</a>}
<a href=#32 id=32 data-nosnippet>32</a>
<a href=#33 id=33 data-nosnippet>33</a><span class="kw">impl</span>&lt;T, O: OrphanQueue&lt;T&gt;&gt; OrphanQueue&lt;T&gt; <span class="kw">for </span><span class="kw-2">&amp;</span>O {
<a href=#34 id=34 data-nosnippet>34</a> <span class="kw">fn </span>push_orphan(<span class="kw-2">&amp;</span><span class="self">self</span>, orphan: T) {
<a href=#35 id=35 data-nosnippet>35</a> (<span class="kw-2">**</span><span class="self">self</span>).push_orphan(orphan);
<a href=#36 id=36 data-nosnippet>36</a> }
<a href=#37 id=37 data-nosnippet>37</a>}
<a href=#38 id=38 data-nosnippet>38</a>
<a href=#39 id=39 data-nosnippet>39</a><span class="doccomment">/// An implementation of `OrphanQueue`.
<a href=#40 id=40 data-nosnippet>40</a></span><span class="attr">#[derive(Debug)]
<a href=#41 id=41 data-nosnippet>41</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>OrphanQueueImpl&lt;T&gt; {
<a href=#42 id=42 data-nosnippet>42</a> sigchild: Mutex&lt;<span class="prelude-ty">Option</span>&lt;watch::Receiver&lt;()&gt;&gt;&gt;,
<a href=#43 id=43 data-nosnippet>43</a> queue: Mutex&lt;Vec&lt;T&gt;&gt;,
<a href=#44 id=44 data-nosnippet>44</a>}
<a href=#45 id=45 data-nosnippet>45</a>
<a href=#46 id=46 data-nosnippet>46</a><span class="kw">impl</span>&lt;T&gt; OrphanQueueImpl&lt;T&gt; {
<a href=#47 id=47 data-nosnippet>47</a> <span class="macro">cfg_not_has_const_mutex_new!</span> {
<a href=#48 id=48 data-nosnippet>48</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
<a href=#49 id=49 data-nosnippet>49</a> <span class="self">Self </span>{
<a href=#50 id=50 data-nosnippet>50</a> sigchild: Mutex::new(<span class="prelude-val">None</span>),
<a href=#51 id=51 data-nosnippet>51</a> queue: Mutex::new(Vec::new()),
<a href=#52 id=52 data-nosnippet>52</a> }
<a href=#53 id=53 data-nosnippet>53</a> }
<a href=#54 id=54 data-nosnippet>54</a> }
<a href=#55 id=55 data-nosnippet>55</a>
<a href=#56 id=56 data-nosnippet>56</a> <span class="macro">cfg_has_const_mutex_new!</span> {
<a href=#57 id=57 data-nosnippet>57</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>new() -&gt; <span class="self">Self </span>{
<a href=#58 id=58 data-nosnippet>58</a> <span class="self">Self </span>{
<a href=#59 id=59 data-nosnippet>59</a> sigchild: Mutex::const_new(<span class="prelude-val">None</span>),
<a href=#60 id=60 data-nosnippet>60</a> queue: Mutex::const_new(Vec::new()),
<a href=#61 id=61 data-nosnippet>61</a> }
<a href=#62 id=62 data-nosnippet>62</a> }
<a href=#63 id=63 data-nosnippet>63</a> }
<a href=#64 id=64 data-nosnippet>64</a>
<a href=#65 id=65 data-nosnippet>65</a> <span class="attr">#[cfg(test)]
<a href=#66 id=66 data-nosnippet>66</a> </span><span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<a href=#67 id=67 data-nosnippet>67</a> <span class="self">self</span>.queue.lock().len()
<a href=#68 id=68 data-nosnippet>68</a> }
<a href=#69 id=69 data-nosnippet>69</a>
<a href=#70 id=70 data-nosnippet>70</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>push_orphan(<span class="kw-2">&amp;</span><span class="self">self</span>, orphan: T)
<a href=#71 id=71 data-nosnippet>71</a> <span class="kw">where
<a href=#72 id=72 data-nosnippet>72</a> </span>T: Wait,
<a href=#73 id=73 data-nosnippet>73</a> {
<a href=#74 id=74 data-nosnippet>74</a> <span class="self">self</span>.queue.lock().push(orphan);
<a href=#75 id=75 data-nosnippet>75</a> }
<a href=#76 id=76 data-nosnippet>76</a>
<a href=#77 id=77 data-nosnippet>77</a> <span class="doccomment">/// Attempts to reap every process in the queue, ignoring any errors and
<a href=#78 id=78 data-nosnippet>78</a> /// enqueueing any orphans which have not yet exited.
<a href=#79 id=79 data-nosnippet>79</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>reap_orphans(<span class="kw-2">&amp;</span><span class="self">self</span>, handle: <span class="kw-2">&amp;</span>SignalHandle)
<a href=#80 id=80 data-nosnippet>80</a> <span class="kw">where
<a href=#81 id=81 data-nosnippet>81</a> </span>T: Wait,
<a href=#82 id=82 data-nosnippet>82</a> {
<a href=#83 id=83 data-nosnippet>83</a> <span class="comment">// If someone else is holding the lock, they will be responsible for draining
<a href=#84 id=84 data-nosnippet>84</a> // the queue as necessary, so we can safely bail if that happens
<a href=#85 id=85 data-nosnippet>85</a> </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>sigchild_guard) = <span class="self">self</span>.sigchild.try_lock() {
<a href=#86 id=86 data-nosnippet>86</a> <span class="kw">match </span><span class="kw-2">&amp;mut *</span>sigchild_guard {
<a href=#87 id=87 data-nosnippet>87</a> <span class="prelude-val">Some</span>(sigchild) =&gt; {
<a href=#88 id=88 data-nosnippet>88</a> <span class="kw">if </span>sigchild.try_has_changed().and_then(Result::ok).is_some() {
<a href=#89 id=89 data-nosnippet>89</a> drain_orphan_queue(<span class="self">self</span>.queue.lock());
<a href=#90 id=90 data-nosnippet>90</a> }
<a href=#91 id=91 data-nosnippet>91</a> }
<a href=#92 id=92 data-nosnippet>92</a> <span class="prelude-val">None </span>=&gt; {
<a href=#93 id=93 data-nosnippet>93</a> <span class="kw">let </span>queue = <span class="self">self</span>.queue.lock();
<a href=#94 id=94 data-nosnippet>94</a>
<a href=#95 id=95 data-nosnippet>95</a> <span class="comment">// Be lazy and only initialize the SIGCHLD listener if there
<a href=#96 id=96 data-nosnippet>96</a> // are any orphaned processes in the queue.
<a href=#97 id=97 data-nosnippet>97</a> </span><span class="kw">if </span>!queue.is_empty() {
<a href=#98 id=98 data-nosnippet>98</a> <span class="comment">// An errors shouldn't really happen here, but if it does it
<a href=#99 id=99 data-nosnippet>99</a> // means that the signal driver isn't running, in
<a href=#100 id=100 data-nosnippet>100</a> // which case there isn't anything we can
<a href=#101 id=101 data-nosnippet>101</a> // register/initialize here, so we can try again later
<a href=#102 id=102 data-nosnippet>102</a> </span><span class="kw">if let </span><span class="prelude-val">Ok</span>(sigchild) = signal_with_handle(SignalKind::child(), handle) {
<a href=#103 id=103 data-nosnippet>103</a> <span class="kw-2">*</span>sigchild_guard = <span class="prelude-val">Some</span>(sigchild);
<a href=#104 id=104 data-nosnippet>104</a> drain_orphan_queue(queue);
<a href=#105 id=105 data-nosnippet>105</a> }
<a href=#106 id=106 data-nosnippet>106</a> }
<a href=#107 id=107 data-nosnippet>107</a> }
<a href=#108 id=108 data-nosnippet>108</a> }
<a href=#109 id=109 data-nosnippet>109</a> }
<a href=#110 id=110 data-nosnippet>110</a> }
<a href=#111 id=111 data-nosnippet>111</a>}
<a href=#112 id=112 data-nosnippet>112</a>
<a href=#113 id=113 data-nosnippet>113</a><span class="kw">fn </span>drain_orphan_queue&lt;T&gt;(<span class="kw-2">mut </span>queue: MutexGuard&lt;<span class="lifetime">'_</span>, Vec&lt;T&gt;&gt;)
<a href=#114 id=114 data-nosnippet>114</a><span class="kw">where
<a href=#115 id=115 data-nosnippet>115</a> </span>T: Wait,
<a href=#116 id=116 data-nosnippet>116</a>{
<a href=#117 id=117 data-nosnippet>117</a> <span class="kw">for </span>i <span class="kw">in </span>(<span class="number">0</span>..queue.len()).rev() {
<a href=#118 id=118 data-nosnippet>118</a> <span class="kw">match </span>queue[i].try_wait() {
<a href=#119 id=119 data-nosnippet>119</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {}
<a href=#120 id=120 data-nosnippet>120</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="kw">_</span>)) | <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
<a href=#121 id=121 data-nosnippet>121</a> <span class="comment">// The stdlib handles interruption errors (EINTR) when polling a child process.
<a href=#122 id=122 data-nosnippet>122</a> // All other errors represent invalid inputs or pids that have already been
<a href=#123 id=123 data-nosnippet>123</a> // reaped, so we can drop the orphan in case an error is raised.
<a href=#124 id=124 data-nosnippet>124</a> </span>queue.swap_remove(i);
<a href=#125 id=125 data-nosnippet>125</a> }
<a href=#126 id=126 data-nosnippet>126</a> }
<a href=#127 id=127 data-nosnippet>127</a> }
<a href=#128 id=128 data-nosnippet>128</a>
<a href=#129 id=129 data-nosnippet>129</a> drop(queue);
<a href=#130 id=130 data-nosnippet>130</a>}
<a href=#131 id=131 data-nosnippet>131</a>
<a href=#132 id=132 data-nosnippet>132</a><span class="attr">#[cfg(all(test, not(loom)))]
<a href=#133 id=133 data-nosnippet>133</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>test {
<a href=#134 id=134 data-nosnippet>134</a> <span class="kw">use super</span>::<span class="kw-2">*</span>;
<a href=#135 id=135 data-nosnippet>135</a> <span class="kw">use </span><span class="kw">crate</span>::runtime::io::Driver <span class="kw">as </span>IoDriver;
<a href=#136 id=136 data-nosnippet>136</a> <span class="kw">use </span><span class="kw">crate</span>::runtime::signal::{Driver <span class="kw">as </span>SignalDriver, Handle <span class="kw">as </span>SignalHandle};
<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">use </span><span class="kw">crate</span>::sync::watch;
<a href=#138 id=138 data-nosnippet>138</a> <span class="kw">use </span>std::cell::{Cell, RefCell};
<a href=#139 id=139 data-nosnippet>139</a> <span class="kw">use </span>std::io;
<a href=#140 id=140 data-nosnippet>140</a> <span class="kw">use </span>std::os::unix::process::ExitStatusExt;
<a href=#141 id=141 data-nosnippet>141</a> <span class="kw">use </span>std::process::ExitStatus;
<a href=#142 id=142 data-nosnippet>142</a> <span class="kw">use </span>std::rc::Rc;
<a href=#143 id=143 data-nosnippet>143</a>
<a href=#144 id=144 data-nosnippet>144</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>MockQueue&lt;W&gt; {
<a href=#145 id=145 data-nosnippet>145</a> <span class="kw">pub</span>(<span class="kw">crate</span>) all_enqueued: RefCell&lt;Vec&lt;W&gt;&gt;,
<a href=#146 id=146 data-nosnippet>146</a> }
<a href=#147 id=147 data-nosnippet>147</a>
<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">impl</span>&lt;W&gt; MockQueue&lt;W&gt; {
<a href=#149 id=149 data-nosnippet>149</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
<a href=#150 id=150 data-nosnippet>150</a> <span class="self">Self </span>{
<a href=#151 id=151 data-nosnippet>151</a> all_enqueued: RefCell::new(Vec::new()),
<a href=#152 id=152 data-nosnippet>152</a> }
<a href=#153 id=153 data-nosnippet>153</a> }
<a href=#154 id=154 data-nosnippet>154</a> }
<a href=#155 id=155 data-nosnippet>155</a>
<a href=#156 id=156 data-nosnippet>156</a> <span class="kw">impl</span>&lt;W&gt; OrphanQueue&lt;W&gt; <span class="kw">for </span>MockQueue&lt;W&gt; {
<a href=#157 id=157 data-nosnippet>157</a> <span class="kw">fn </span>push_orphan(<span class="kw-2">&amp;</span><span class="self">self</span>, orphan: W) {
<a href=#158 id=158 data-nosnippet>158</a> <span class="self">self</span>.all_enqueued.borrow_mut().push(orphan);
<a href=#159 id=159 data-nosnippet>159</a> }
<a href=#160 id=160 data-nosnippet>160</a> }
<a href=#161 id=161 data-nosnippet>161</a>
<a href=#162 id=162 data-nosnippet>162</a> <span class="kw">struct </span>MockWait {
<a href=#163 id=163 data-nosnippet>163</a> total_waits: Rc&lt;Cell&lt;usize&gt;&gt;,
<a href=#164 id=164 data-nosnippet>164</a> num_wait_until_status: usize,
<a href=#165 id=165 data-nosnippet>165</a> return_err: bool,
<a href=#166 id=166 data-nosnippet>166</a> }
<a href=#167 id=167 data-nosnippet>167</a>
<a href=#168 id=168 data-nosnippet>168</a> <span class="kw">impl </span>MockWait {
<a href=#169 id=169 data-nosnippet>169</a> <span class="kw">fn </span>new(num_wait_until_status: usize) -&gt; <span class="self">Self </span>{
<a href=#170 id=170 data-nosnippet>170</a> <span class="self">Self </span>{
<a href=#171 id=171 data-nosnippet>171</a> total_waits: Rc::new(Cell::new(<span class="number">0</span>)),
<a href=#172 id=172 data-nosnippet>172</a> num_wait_until_status,
<a href=#173 id=173 data-nosnippet>173</a> return_err: <span class="bool-val">false</span>,
<a href=#174 id=174 data-nosnippet>174</a> }
<a href=#175 id=175 data-nosnippet>175</a> }
<a href=#176 id=176 data-nosnippet>176</a>
<a href=#177 id=177 data-nosnippet>177</a> <span class="kw">fn </span>with_err() -&gt; <span class="self">Self </span>{
<a href=#178 id=178 data-nosnippet>178</a> <span class="self">Self </span>{
<a href=#179 id=179 data-nosnippet>179</a> total_waits: Rc::new(Cell::new(<span class="number">0</span>)),
<a href=#180 id=180 data-nosnippet>180</a> num_wait_until_status: <span class="number">0</span>,
<a href=#181 id=181 data-nosnippet>181</a> return_err: <span class="bool-val">true</span>,
<a href=#182 id=182 data-nosnippet>182</a> }
<a href=#183 id=183 data-nosnippet>183</a> }
<a href=#184 id=184 data-nosnippet>184</a> }
<a href=#185 id=185 data-nosnippet>185</a>
<a href=#186 id=186 data-nosnippet>186</a> <span class="kw">impl </span>Wait <span class="kw">for </span>MockWait {
<a href=#187 id=187 data-nosnippet>187</a> <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<a href=#188 id=188 data-nosnippet>188</a> <span class="number">42
<a href=#189 id=189 data-nosnippet>189</a> </span>}
<a href=#190 id=190 data-nosnippet>190</a>
<a href=#191 id=191 data-nosnippet>191</a> <span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt; {
<a href=#192 id=192 data-nosnippet>192</a> <span class="kw">let </span>waits = <span class="self">self</span>.total_waits.get();
<a href=#193 id=193 data-nosnippet>193</a>
<a href=#194 id=194 data-nosnippet>194</a> <span class="kw">let </span>ret = <span class="kw">if </span><span class="self">self</span>.num_wait_until_status == waits {
<a href=#195 id=195 data-nosnippet>195</a> <span class="kw">if </span><span class="self">self</span>.return_err {
<a href=#196 id=196 data-nosnippet>196</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(ExitStatus::from_raw(<span class="number">0</span>)))
<a href=#197 id=197 data-nosnippet>197</a> } <span class="kw">else </span>{
<a href=#198 id=198 data-nosnippet>198</a> <span class="prelude-val">Err</span>(io::Error::new(io::ErrorKind::Other, <span class="string">"mock err"</span>))
<a href=#199 id=199 data-nosnippet>199</a> }
<a href=#200 id=200 data-nosnippet>200</a> } <span class="kw">else </span>{
<a href=#201 id=201 data-nosnippet>201</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
<a href=#202 id=202 data-nosnippet>202</a> };
<a href=#203 id=203 data-nosnippet>203</a>
<a href=#204 id=204 data-nosnippet>204</a> <span class="self">self</span>.total_waits.set(waits + <span class="number">1</span>);
<a href=#205 id=205 data-nosnippet>205</a> ret
<a href=#206 id=206 data-nosnippet>206</a> }
<a href=#207 id=207 data-nosnippet>207</a> }
<a href=#208 id=208 data-nosnippet>208</a>
<a href=#209 id=209 data-nosnippet>209</a> <span class="attr">#[test]
<a href=#210 id=210 data-nosnippet>210</a> </span><span class="kw">fn </span>drain_attempts_a_single_reap_of_all_queued_orphans() {
<a href=#211 id=211 data-nosnippet>211</a> <span class="kw">let </span>first_orphan = MockWait::new(<span class="number">0</span>);
<a href=#212 id=212 data-nosnippet>212</a> <span class="kw">let </span>second_orphan = MockWait::new(<span class="number">1</span>);
<a href=#213 id=213 data-nosnippet>213</a> <span class="kw">let </span>third_orphan = MockWait::new(<span class="number">2</span>);
<a href=#214 id=214 data-nosnippet>214</a> <span class="kw">let </span>fourth_orphan = MockWait::with_err();
<a href=#215 id=215 data-nosnippet>215</a>
<a href=#216 id=216 data-nosnippet>216</a> <span class="kw">let </span>first_waits = first_orphan.total_waits.clone();
<a href=#217 id=217 data-nosnippet>217</a> <span class="kw">let </span>second_waits = second_orphan.total_waits.clone();
<a href=#218 id=218 data-nosnippet>218</a> <span class="kw">let </span>third_waits = third_orphan.total_waits.clone();
<a href=#219 id=219 data-nosnippet>219</a> <span class="kw">let </span>fourth_waits = fourth_orphan.total_waits.clone();
<a href=#220 id=220 data-nosnippet>220</a>
<a href=#221 id=221 data-nosnippet>221</a> <span class="kw">let </span>orphanage = OrphanQueueImpl::new();
<a href=#222 id=222 data-nosnippet>222</a> orphanage.push_orphan(first_orphan);
<a href=#223 id=223 data-nosnippet>223</a> orphanage.push_orphan(third_orphan);
<a href=#224 id=224 data-nosnippet>224</a> orphanage.push_orphan(second_orphan);
<a href=#225 id=225 data-nosnippet>225</a> orphanage.push_orphan(fourth_orphan);
<a href=#226 id=226 data-nosnippet>226</a>
<a href=#227 id=227 data-nosnippet>227</a> <span class="macro">assert_eq!</span>(orphanage.len(), <span class="number">4</span>);
<a href=#228 id=228 data-nosnippet>228</a>
<a href=#229 id=229 data-nosnippet>229</a> drain_orphan_queue(orphanage.queue.lock());
<a href=#230 id=230 data-nosnippet>230</a> <span class="macro">assert_eq!</span>(orphanage.len(), <span class="number">2</span>);
<a href=#231 id=231 data-nosnippet>231</a> <span class="macro">assert_eq!</span>(first_waits.get(), <span class="number">1</span>);
<a href=#232 id=232 data-nosnippet>232</a> <span class="macro">assert_eq!</span>(second_waits.get(), <span class="number">1</span>);
<a href=#233 id=233 data-nosnippet>233</a> <span class="macro">assert_eq!</span>(third_waits.get(), <span class="number">1</span>);
<a href=#234 id=234 data-nosnippet>234</a> <span class="macro">assert_eq!</span>(fourth_waits.get(), <span class="number">1</span>);
<a href=#235 id=235 data-nosnippet>235</a>
<a href=#236 id=236 data-nosnippet>236</a> drain_orphan_queue(orphanage.queue.lock());
<a href=#237 id=237 data-nosnippet>237</a> <span class="macro">assert_eq!</span>(orphanage.len(), <span class="number">1</span>);
<a href=#238 id=238 data-nosnippet>238</a> <span class="macro">assert_eq!</span>(first_waits.get(), <span class="number">1</span>);
<a href=#239 id=239 data-nosnippet>239</a> <span class="macro">assert_eq!</span>(second_waits.get(), <span class="number">2</span>);
<a href=#240 id=240 data-nosnippet>240</a> <span class="macro">assert_eq!</span>(third_waits.get(), <span class="number">2</span>);
<a href=#241 id=241 data-nosnippet>241</a> <span class="macro">assert_eq!</span>(fourth_waits.get(), <span class="number">1</span>);
<a href=#242 id=242 data-nosnippet>242</a>
<a href=#243 id=243 data-nosnippet>243</a> drain_orphan_queue(orphanage.queue.lock());
<a href=#244 id=244 data-nosnippet>244</a> <span class="macro">assert_eq!</span>(orphanage.len(), <span class="number">0</span>);
<a href=#245 id=245 data-nosnippet>245</a> <span class="macro">assert_eq!</span>(first_waits.get(), <span class="number">1</span>);
<a href=#246 id=246 data-nosnippet>246</a> <span class="macro">assert_eq!</span>(second_waits.get(), <span class="number">2</span>);
<a href=#247 id=247 data-nosnippet>247</a> <span class="macro">assert_eq!</span>(third_waits.get(), <span class="number">3</span>);
<a href=#248 id=248 data-nosnippet>248</a> <span class="macro">assert_eq!</span>(fourth_waits.get(), <span class="number">1</span>);
<a href=#249 id=249 data-nosnippet>249</a>
<a href=#250 id=250 data-nosnippet>250</a> <span class="comment">// Safe to reap when empty
<a href=#251 id=251 data-nosnippet>251</a> </span>drain_orphan_queue(orphanage.queue.lock());
<a href=#252 id=252 data-nosnippet>252</a> }
<a href=#253 id=253 data-nosnippet>253</a>
<a href=#254 id=254 data-nosnippet>254</a> <span class="attr">#[test]
<a href=#255 id=255 data-nosnippet>255</a> </span><span class="kw">fn </span>no_reap_if_no_signal_received() {
<a href=#256 id=256 data-nosnippet>256</a> <span class="kw">let </span>(tx, rx) = watch::channel(());
<a href=#257 id=257 data-nosnippet>257</a>
<a href=#258 id=258 data-nosnippet>258</a> <span class="kw">let </span>handle = SignalHandle::default();
<a href=#259 id=259 data-nosnippet>259</a>
<a href=#260 id=260 data-nosnippet>260</a> <span class="kw">let </span>orphanage = OrphanQueueImpl::new();
<a href=#261 id=261 data-nosnippet>261</a> <span class="kw-2">*</span>orphanage.sigchild.lock() = <span class="prelude-val">Some</span>(rx);
<a href=#262 id=262 data-nosnippet>262</a>
<a href=#263 id=263 data-nosnippet>263</a> <span class="kw">let </span>orphan = MockWait::new(<span class="number">2</span>);
<a href=#264 id=264 data-nosnippet>264</a> <span class="kw">let </span>waits = orphan.total_waits.clone();
<a href=#265 id=265 data-nosnippet>265</a> orphanage.push_orphan(orphan);
<a href=#266 id=266 data-nosnippet>266</a>
<a href=#267 id=267 data-nosnippet>267</a> orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#268 id=268 data-nosnippet>268</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">0</span>);
<a href=#269 id=269 data-nosnippet>269</a>
<a href=#270 id=270 data-nosnippet>270</a> orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#271 id=271 data-nosnippet>271</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">0</span>);
<a href=#272 id=272 data-nosnippet>272</a>
<a href=#273 id=273 data-nosnippet>273</a> tx.send(()).unwrap();
<a href=#274 id=274 data-nosnippet>274</a> orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#275 id=275 data-nosnippet>275</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">1</span>);
<a href=#276 id=276 data-nosnippet>276</a> }
<a href=#277 id=277 data-nosnippet>277</a>
<a href=#278 id=278 data-nosnippet>278</a> <span class="attr">#[test]
<a href=#279 id=279 data-nosnippet>279</a> </span><span class="kw">fn </span>no_reap_if_signal_lock_held() {
<a href=#280 id=280 data-nosnippet>280</a> <span class="kw">let </span>handle = SignalHandle::default();
<a href=#281 id=281 data-nosnippet>281</a>
<a href=#282 id=282 data-nosnippet>282</a> <span class="kw">let </span>orphanage = OrphanQueueImpl::new();
<a href=#283 id=283 data-nosnippet>283</a> <span class="kw">let </span>signal_guard = orphanage.sigchild.lock();
<a href=#284 id=284 data-nosnippet>284</a>
<a href=#285 id=285 data-nosnippet>285</a> <span class="kw">let </span>orphan = MockWait::new(<span class="number">2</span>);
<a href=#286 id=286 data-nosnippet>286</a> <span class="kw">let </span>waits = orphan.total_waits.clone();
<a href=#287 id=287 data-nosnippet>287</a> orphanage.push_orphan(orphan);
<a href=#288 id=288 data-nosnippet>288</a>
<a href=#289 id=289 data-nosnippet>289</a> orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#290 id=290 data-nosnippet>290</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">0</span>);
<a href=#291 id=291 data-nosnippet>291</a>
<a href=#292 id=292 data-nosnippet>292</a> drop(signal_guard);
<a href=#293 id=293 data-nosnippet>293</a> }
<a href=#294 id=294 data-nosnippet>294</a>
<a href=#295 id=295 data-nosnippet>295</a> <span class="attr">#[cfg_attr(miri, ignore)] </span><span class="comment">// No `sigaction` on Miri
<a href=#296 id=296 data-nosnippet>296</a> </span><span class="attr">#[test]
<a href=#297 id=297 data-nosnippet>297</a> </span><span class="kw">fn </span>does_not_register_signal_if_queue_empty() {
<a href=#298 id=298 data-nosnippet>298</a> <span class="kw">let </span>(io_driver, io_handle) = IoDriver::new(<span class="number">1024</span>).unwrap();
<a href=#299 id=299 data-nosnippet>299</a> <span class="kw">let </span>signal_driver = SignalDriver::new(io_driver, <span class="kw-2">&amp;</span>io_handle).unwrap();
<a href=#300 id=300 data-nosnippet>300</a> <span class="kw">let </span>handle = signal_driver.handle();
<a href=#301 id=301 data-nosnippet>301</a>
<a href=#302 id=302 data-nosnippet>302</a> <span class="kw">let </span>orphanage = OrphanQueueImpl::new();
<a href=#303 id=303 data-nosnippet>303</a> <span class="macro">assert!</span>(orphanage.sigchild.lock().is_none()); <span class="comment">// Sanity
<a href=#304 id=304 data-nosnippet>304</a>
<a href=#305 id=305 data-nosnippet>305</a> // No register when queue empty
<a href=#306 id=306 data-nosnippet>306</a> </span>orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#307 id=307 data-nosnippet>307</a> <span class="macro">assert!</span>(orphanage.sigchild.lock().is_none());
<a href=#308 id=308 data-nosnippet>308</a>
<a href=#309 id=309 data-nosnippet>309</a> <span class="kw">let </span>orphan = MockWait::new(<span class="number">2</span>);
<a href=#310 id=310 data-nosnippet>310</a> <span class="kw">let </span>waits = orphan.total_waits.clone();
<a href=#311 id=311 data-nosnippet>311</a> orphanage.push_orphan(orphan);
<a href=#312 id=312 data-nosnippet>312</a>
<a href=#313 id=313 data-nosnippet>313</a> orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#314 id=314 data-nosnippet>314</a> <span class="macro">assert!</span>(orphanage.sigchild.lock().is_some());
<a href=#315 id=315 data-nosnippet>315</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">1</span>); <span class="comment">// Eager reap when registering listener
<a href=#316 id=316 data-nosnippet>316</a> </span>}
<a href=#317 id=317 data-nosnippet>317</a>
<a href=#318 id=318 data-nosnippet>318</a> <span class="attr">#[test]
<a href=#319 id=319 data-nosnippet>319</a> </span><span class="kw">fn </span>does_nothing_if_signal_could_not_be_registered() {
<a href=#320 id=320 data-nosnippet>320</a> <span class="kw">let </span>handle = SignalHandle::default();
<a href=#321 id=321 data-nosnippet>321</a>
<a href=#322 id=322 data-nosnippet>322</a> <span class="kw">let </span>orphanage = OrphanQueueImpl::new();
<a href=#323 id=323 data-nosnippet>323</a> <span class="macro">assert!</span>(orphanage.sigchild.lock().is_none());
<a href=#324 id=324 data-nosnippet>324</a>
<a href=#325 id=325 data-nosnippet>325</a> <span class="kw">let </span>orphan = MockWait::new(<span class="number">2</span>);
<a href=#326 id=326 data-nosnippet>326</a> <span class="kw">let </span>waits = orphan.total_waits.clone();
<a href=#327 id=327 data-nosnippet>327</a> orphanage.push_orphan(orphan);
<a href=#328 id=328 data-nosnippet>328</a>
<a href=#329 id=329 data-nosnippet>329</a> <span class="comment">// Signal handler has "gone away", nothing to register or reap
<a href=#330 id=330 data-nosnippet>330</a> </span>orphanage.reap_orphans(<span class="kw-2">&amp;</span>handle);
<a href=#331 id=331 data-nosnippet>331</a> <span class="macro">assert!</span>(orphanage.sigchild.lock().is_none());
<a href=#332 id=332 data-nosnippet>332</a> <span class="macro">assert_eq!</span>(waits.get(), <span class="number">0</span>);
<a href=#333 id=333 data-nosnippet>333</a> }
<a href=#334 id=334 data-nosnippet>334</a>}
</code></pre></div></section></main></body></html>
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<!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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.49.0/src/process/unix/pidfd_reaper.rs`."><title>pidfd_reaper.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../../../static.files/storage-e2aeef58.js"></script><script defer src="../../../../static.files/src-script-813739b1.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">tokio/process/unix/</div>pidfd_reaper.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use crate</span>::{
<a href=#2 id=2 data-nosnippet>2</a> io::{interest::Interest, PollEvented},
<a href=#3 id=3 data-nosnippet>3</a> process::{
<a href=#4 id=4 data-nosnippet>4</a> imp::{orphan::Wait, OrphanQueue},
<a href=#5 id=5 data-nosnippet>5</a> kill::Kill,
<a href=#6 id=6 data-nosnippet>6</a> },
<a href=#7 id=7 data-nosnippet>7</a> util::error::RUNTIME_SHUTTING_DOWN_ERROR,
<a href=#8 id=8 data-nosnippet>8</a>};
<a href=#9 id=9 data-nosnippet>9</a>
<a href=#10 id=10 data-nosnippet>10</a><span class="kw">use </span>libc::{syscall, SYS_pidfd_open, ENOSYS, PIDFD_NONBLOCK};
<a href=#11 id=11 data-nosnippet>11</a><span class="kw">use </span>mio::{event::Source, unix::SourceFd};
<a href=#12 id=12 data-nosnippet>12</a><span class="kw">use </span>std::{
<a href=#13 id=13 data-nosnippet>13</a> fs::File,
<a href=#14 id=14 data-nosnippet>14</a> future::Future,
<a href=#15 id=15 data-nosnippet>15</a> io,
<a href=#16 id=16 data-nosnippet>16</a> marker::Unpin,
<a href=#17 id=17 data-nosnippet>17</a> ops::Deref,
<a href=#18 id=18 data-nosnippet>18</a> os::unix::io::{AsRawFd, FromRawFd, RawFd},
<a href=#19 id=19 data-nosnippet>19</a> pin::Pin,
<a href=#20 id=20 data-nosnippet>20</a> process::ExitStatus,
<a href=#21 id=21 data-nosnippet>21</a> sync::atomic::{AtomicBool, Ordering::Relaxed},
<a href=#22 id=22 data-nosnippet>22</a> task::{Context, Poll},
<a href=#23 id=23 data-nosnippet>23</a>};
<a href=#24 id=24 data-nosnippet>24</a>
<a href=#25 id=25 data-nosnippet>25</a><span class="attr">#[derive(Debug)]
<a href=#26 id=26 data-nosnippet>26</a></span><span class="kw">struct </span>Pidfd {
<a href=#27 id=27 data-nosnippet>27</a> fd: File,
<a href=#28 id=28 data-nosnippet>28</a>}
<a href=#29 id=29 data-nosnippet>29</a>
<a href=#30 id=30 data-nosnippet>30</a><span class="kw">impl </span>Pidfd {
<a href=#31 id=31 data-nosnippet>31</a> <span class="kw">fn </span>open(pid: u32) -&gt; <span class="prelude-ty">Option</span>&lt;Pidfd&gt; {
<a href=#32 id=32 data-nosnippet>32</a> <span class="comment">// Store false (0) to reduce executable size
<a href=#33 id=33 data-nosnippet>33</a> </span><span class="kw">static </span>NO_PIDFD_SUPPORT: AtomicBool = AtomicBool::new(<span class="bool-val">false</span>);
<a href=#34 id=34 data-nosnippet>34</a>
<a href=#35 id=35 data-nosnippet>35</a> <span class="kw">if </span>NO_PIDFD_SUPPORT.load(Relaxed) {
<a href=#36 id=36 data-nosnippet>36</a> <span class="kw">return </span><span class="prelude-val">None</span>;
<a href=#37 id=37 data-nosnippet>37</a> }
<a href=#38 id=38 data-nosnippet>38</a>
<a href=#39 id=39 data-nosnippet>39</a> <span class="comment">// Safety: The following function calls invovkes syscall pidfd_open,
<a href=#40 id=40 data-nosnippet>40</a> // which takes two parameter: pidfd_open(fd: c_int, flag: c_int)
<a href=#41 id=41 data-nosnippet>41</a> </span><span class="kw">let </span>fd = <span class="kw">unsafe </span>{ syscall(SYS_pidfd_open, pid, PIDFD_NONBLOCK) };
<a href=#42 id=42 data-nosnippet>42</a> <span class="kw">if </span>fd == -<span class="number">1 </span>{
<a href=#43 id=43 data-nosnippet>43</a> <span class="kw">let </span>errno = io::Error::last_os_error().raw_os_error().unwrap();
<a href=#44 id=44 data-nosnippet>44</a>
<a href=#45 id=45 data-nosnippet>45</a> <span class="kw">if </span>errno == ENOSYS {
<a href=#46 id=46 data-nosnippet>46</a> NO_PIDFD_SUPPORT.store(<span class="bool-val">true</span>, Relaxed)
<a href=#47 id=47 data-nosnippet>47</a> }
<a href=#48 id=48 data-nosnippet>48</a>
<a href=#49 id=49 data-nosnippet>49</a> <span class="prelude-val">None
<a href=#50 id=50 data-nosnippet>50</a> </span>} <span class="kw">else </span>{
<a href=#51 id=51 data-nosnippet>51</a> <span class="comment">// Safety: pidfd_open returns -1 on error or a valid fd with ownership.
<a href=#52 id=52 data-nosnippet>52</a> </span><span class="prelude-val">Some</span>(Pidfd {
<a href=#53 id=53 data-nosnippet>53</a> fd: <span class="kw">unsafe </span>{ File::from_raw_fd(fd <span class="kw">as </span>i32) },
<a href=#54 id=54 data-nosnippet>54</a> })
<a href=#55 id=55 data-nosnippet>55</a> }
<a href=#56 id=56 data-nosnippet>56</a> }
<a href=#57 id=57 data-nosnippet>57</a>}
<a href=#58 id=58 data-nosnippet>58</a>
<a href=#59 id=59 data-nosnippet>59</a><span class="kw">impl </span>AsRawFd <span class="kw">for </span>Pidfd {
<a href=#60 id=60 data-nosnippet>60</a> <span class="kw">fn </span>as_raw_fd(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RawFd {
<a href=#61 id=61 data-nosnippet>61</a> <span class="self">self</span>.fd.as_raw_fd()
<a href=#62 id=62 data-nosnippet>62</a> }
<a href=#63 id=63 data-nosnippet>63</a>}
<a href=#64 id=64 data-nosnippet>64</a>
<a href=#65 id=65 data-nosnippet>65</a><span class="kw">impl </span>Source <span class="kw">for </span>Pidfd {
<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">fn </span>register(
<a href=#67 id=67 data-nosnippet>67</a> <span class="kw-2">&amp;mut </span><span class="self">self</span>,
<a href=#68 id=68 data-nosnippet>68</a> registry: <span class="kw-2">&amp;</span>mio::Registry,
<a href=#69 id=69 data-nosnippet>69</a> token: mio::Token,
<a href=#70 id=70 data-nosnippet>70</a> interest: mio::Interest,
<a href=#71 id=71 data-nosnippet>71</a> ) -&gt; io::Result&lt;()&gt; {
<a href=#72 id=72 data-nosnippet>72</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).register(registry, token, interest)
<a href=#73 id=73 data-nosnippet>73</a> }
<a href=#74 id=74 data-nosnippet>74</a>
<a href=#75 id=75 data-nosnippet>75</a> <span class="kw">fn </span>reregister(
<a href=#76 id=76 data-nosnippet>76</a> <span class="kw-2">&amp;mut </span><span class="self">self</span>,
<a href=#77 id=77 data-nosnippet>77</a> registry: <span class="kw-2">&amp;</span>mio::Registry,
<a href=#78 id=78 data-nosnippet>78</a> token: mio::Token,
<a href=#79 id=79 data-nosnippet>79</a> interest: mio::Interest,
<a href=#80 id=80 data-nosnippet>80</a> ) -&gt; io::Result&lt;()&gt; {
<a href=#81 id=81 data-nosnippet>81</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).reregister(registry, token, interest)
<a href=#82 id=82 data-nosnippet>82</a> }
<a href=#83 id=83 data-nosnippet>83</a>
<a href=#84 id=84 data-nosnippet>84</a> <span class="kw">fn </span>deregister(<span class="kw-2">&amp;mut </span><span class="self">self</span>, registry: <span class="kw-2">&amp;</span>mio::Registry) -&gt; io::Result&lt;()&gt; {
<a href=#85 id=85 data-nosnippet>85</a> SourceFd(<span class="kw-2">&amp;</span><span class="self">self</span>.as_raw_fd()).deregister(registry)
<a href=#86 id=86 data-nosnippet>86</a> }
<a href=#87 id=87 data-nosnippet>87</a>}
<a href=#88 id=88 data-nosnippet>88</a>
<a href=#89 id=89 data-nosnippet>89</a><span class="attr">#[derive(Debug)]
<a href=#90 id=90 data-nosnippet>90</a></span><span class="kw">struct </span>PidfdReaperInner&lt;W&gt;
<a href=#91 id=91 data-nosnippet>91</a><span class="kw">where
<a href=#92 id=92 data-nosnippet>92</a> </span>W: Unpin,
<a href=#93 id=93 data-nosnippet>93</a>{
<a href=#94 id=94 data-nosnippet>94</a> inner: W,
<a href=#95 id=95 data-nosnippet>95</a> pidfd: PollEvented&lt;Pidfd&gt;,
<a href=#96 id=96 data-nosnippet>96</a>}
<a href=#97 id=97 data-nosnippet>97</a>
<a href=#98 id=98 data-nosnippet>98</a><span class="kw">fn </span>display_eq(d: <span class="kw">impl </span>std::fmt::Display, s: <span class="kw-2">&amp;</span>str) -&gt; bool {
<a href=#99 id=99 data-nosnippet>99</a> <span class="kw">use </span>std::fmt::Write;
<a href=#100 id=100 data-nosnippet>100</a>
<a href=#101 id=101 data-nosnippet>101</a> <span class="kw">struct </span>FormatEq&lt;<span class="lifetime">'r</span>&gt; {
<a href=#102 id=102 data-nosnippet>102</a> remainder: <span class="kw-2">&amp;</span><span class="lifetime">'r </span>str,
<a href=#103 id=103 data-nosnippet>103</a> unequal: bool,
<a href=#104 id=104 data-nosnippet>104</a> }
<a href=#105 id=105 data-nosnippet>105</a>
<a href=#106 id=106 data-nosnippet>106</a> <span class="kw">impl</span>&lt;<span class="lifetime">'r</span>&gt; Write <span class="kw">for </span>FormatEq&lt;<span class="lifetime">'r</span>&gt; {
<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">fn </span>write_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, s: <span class="kw-2">&amp;</span>str) -&gt; std::fmt::Result {
<a href=#108 id=108 data-nosnippet>108</a> <span class="kw">if </span>!<span class="self">self</span>.unequal {
<a href=#109 id=109 data-nosnippet>109</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(new_remainder) = <span class="self">self</span>.remainder.strip_prefix(s) {
<a href=#110 id=110 data-nosnippet>110</a> <span class="self">self</span>.remainder = new_remainder;
<a href=#111 id=111 data-nosnippet>111</a> } <span class="kw">else </span>{
<a href=#112 id=112 data-nosnippet>112</a> <span class="self">self</span>.unequal = <span class="bool-val">true</span>;
<a href=#113 id=113 data-nosnippet>113</a> }
<a href=#114 id=114 data-nosnippet>114</a> }
<a href=#115 id=115 data-nosnippet>115</a> <span class="prelude-val">Ok</span>(())
<a href=#116 id=116 data-nosnippet>116</a> }
<a href=#117 id=117 data-nosnippet>117</a> }
<a href=#118 id=118 data-nosnippet>118</a>
<a href=#119 id=119 data-nosnippet>119</a> <span class="kw">let </span><span class="kw-2">mut </span>fmt_eq = FormatEq {
<a href=#120 id=120 data-nosnippet>120</a> remainder: s,
<a href=#121 id=121 data-nosnippet>121</a> unequal: <span class="bool-val">false</span>,
<a href=#122 id=122 data-nosnippet>122</a> };
<a href=#123 id=123 data-nosnippet>123</a> <span class="kw">let _ </span>= <span class="macro">write!</span>(fmt_eq, <span class="string">"{d}"</span>);
<a href=#124 id=124 data-nosnippet>124</a> fmt_eq.remainder.is_empty() &amp;&amp; !fmt_eq.unequal
<a href=#125 id=125 data-nosnippet>125</a>}
<a href=#126 id=126 data-nosnippet>126</a>
<a href=#127 id=127 data-nosnippet>127</a><span class="kw">fn </span>is_rt_shutdown_err(err: <span class="kw-2">&amp;</span>io::Error) -&gt; bool {
<a href=#128 id=128 data-nosnippet>128</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = err.get_ref() {
<a href=#129 id=129 data-nosnippet>129</a> err.kind() == io::ErrorKind::Other
<a href=#130 id=130 data-nosnippet>130</a> &amp;&amp; inner.source().is_none()
<a href=#131 id=131 data-nosnippet>131</a> &amp;&amp; display_eq(inner, RUNTIME_SHUTTING_DOWN_ERROR)
<a href=#132 id=132 data-nosnippet>132</a> } <span class="kw">else </span>{
<a href=#133 id=133 data-nosnippet>133</a> <span class="bool-val">false
<a href=#134 id=134 data-nosnippet>134</a> </span>}
<a href=#135 id=135 data-nosnippet>135</a>}
<a href=#136 id=136 data-nosnippet>136</a>
<a href=#137 id=137 data-nosnippet>137</a><span class="kw">impl</span>&lt;W&gt; Future <span class="kw">for </span>PidfdReaperInner&lt;W&gt;
<a href=#138 id=138 data-nosnippet>138</a><span class="kw">where
<a href=#139 id=139 data-nosnippet>139</a> </span>W: Wait + Unpin,
<a href=#140 id=140 data-nosnippet>140</a>{
<a href=#141 id=141 data-nosnippet>141</a> <span class="kw">type </span>Output = io::Result&lt;ExitStatus&gt;;
<a href=#142 id=142 data-nosnippet>142</a>
<a href=#143 id=143 data-nosnippet>143</a> <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
<a href=#144 id=144 data-nosnippet>144</a> <span class="kw">let </span>this = Pin::into_inner(<span class="self">self</span>);
<a href=#145 id=145 data-nosnippet>145</a>
<a href=#146 id=146 data-nosnippet>146</a> <span class="kw">match </span>this.pidfd.registration().poll_read_ready(cx) {
<a href=#147 id=147 data-nosnippet>147</a> Poll::Ready(<span class="prelude-val">Ok</span>(evt)) =&gt; {
<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(exit_code) = this.inner.try_wait()<span class="question-mark">? </span>{
<a href=#149 id=149 data-nosnippet>149</a> <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(exit_code));
<a href=#150 id=150 data-nosnippet>150</a> }
<a href=#151 id=151 data-nosnippet>151</a> this.pidfd.registration().clear_readiness(evt);
<a href=#152 id=152 data-nosnippet>152</a> }
<a href=#153 id=153 data-nosnippet>153</a> Poll::Ready(<span class="prelude-val">Err</span>(err)) <span class="kw">if </span>is_rt_shutdown_err(<span class="kw-2">&amp;</span>err) =&gt; {}
<a href=#154 id=154 data-nosnippet>154</a> Poll::Ready(<span class="prelude-val">Err</span>(err)) =&gt; <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(err)),
<a href=#155 id=155 data-nosnippet>155</a> Poll::Pending =&gt; <span class="kw">return </span>Poll::Pending,
<a href=#156 id=156 data-nosnippet>156</a> };
<a href=#157 id=157 data-nosnippet>157</a>
<a href=#158 id=158 data-nosnippet>158</a> this.pidfd.reregister(Interest::READABLE)<span class="question-mark">?</span>;
<a href=#159 id=159 data-nosnippet>159</a> cx.waker().wake_by_ref();
<a href=#160 id=160 data-nosnippet>160</a> Poll::Pending
<a href=#161 id=161 data-nosnippet>161</a> }
<a href=#162 id=162 data-nosnippet>162</a>}
<a href=#163 id=163 data-nosnippet>163</a>
<a href=#164 id=164 data-nosnippet>164</a><span class="attr">#[derive(Debug)]
<a href=#165 id=165 data-nosnippet>165</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>PidfdReaper&lt;W, Q&gt;
<a href=#166 id=166 data-nosnippet>166</a><span class="kw">where
<a href=#167 id=167 data-nosnippet>167</a> </span>W: Wait + Unpin,
<a href=#168 id=168 data-nosnippet>168</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#169 id=169 data-nosnippet>169</a>{
<a href=#170 id=170 data-nosnippet>170</a> inner: <span class="prelude-ty">Option</span>&lt;PidfdReaperInner&lt;W&gt;&gt;,
<a href=#171 id=171 data-nosnippet>171</a> orphan_queue: Q,
<a href=#172 id=172 data-nosnippet>172</a>}
<a href=#173 id=173 data-nosnippet>173</a>
<a href=#174 id=174 data-nosnippet>174</a><span class="kw">impl</span>&lt;W, Q&gt; Deref <span class="kw">for </span>PidfdReaper&lt;W, Q&gt;
<a href=#175 id=175 data-nosnippet>175</a><span class="kw">where
<a href=#176 id=176 data-nosnippet>176</a> </span>W: Wait + Unpin,
<a href=#177 id=177 data-nosnippet>177</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#178 id=178 data-nosnippet>178</a>{
<a href=#179 id=179 data-nosnippet>179</a> <span class="kw">type </span>Target = W;
<a href=#180 id=180 data-nosnippet>180</a>
<a href=#181 id=181 data-nosnippet>181</a> <span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="self">Self</span>::Target {
<a href=#182 id=182 data-nosnippet>182</a> <span class="kw-2">&amp;</span><span class="self">self</span>.inner.as_ref().expect(<span class="string">"inner has gone away"</span>).inner
<a href=#183 id=183 data-nosnippet>183</a> }
<a href=#184 id=184 data-nosnippet>184</a>}
<a href=#185 id=185 data-nosnippet>185</a>
<a href=#186 id=186 data-nosnippet>186</a><span class="kw">impl</span>&lt;W, Q&gt; PidfdReaper&lt;W, Q&gt;
<a href=#187 id=187 data-nosnippet>187</a><span class="kw">where
<a href=#188 id=188 data-nosnippet>188</a> </span>W: Wait + Unpin,
<a href=#189 id=189 data-nosnippet>189</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#190 id=190 data-nosnippet>190</a>{
<a href=#191 id=191 data-nosnippet>191</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(inner: W, orphan_queue: Q) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, (<span class="prelude-ty">Option</span>&lt;io::Error&gt;, W)&gt; {
<a href=#192 id=192 data-nosnippet>192</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(pidfd) = Pidfd::open(inner.id()) {
<a href=#193 id=193 data-nosnippet>193</a> <span class="kw">match </span>PollEvented::new_with_interest(pidfd, Interest::READABLE) {
<a href=#194 id=194 data-nosnippet>194</a> <span class="prelude-val">Ok</span>(pidfd) =&gt; <span class="prelude-val">Ok</span>(<span class="self">Self </span>{
<a href=#195 id=195 data-nosnippet>195</a> inner: <span class="prelude-val">Some</span>(PidfdReaperInner { pidfd, inner }),
<a href=#196 id=196 data-nosnippet>196</a> orphan_queue,
<a href=#197 id=197 data-nosnippet>197</a> }),
<a href=#198 id=198 data-nosnippet>198</a> <span class="prelude-val">Err</span>(io_error) =&gt; <span class="prelude-val">Err</span>((<span class="prelude-val">Some</span>(io_error), inner)),
<a href=#199 id=199 data-nosnippet>199</a> }
<a href=#200 id=200 data-nosnippet>200</a> } <span class="kw">else </span>{
<a href=#201 id=201 data-nosnippet>201</a> <span class="prelude-val">Err</span>((<span class="prelude-val">None</span>, inner))
<a href=#202 id=202 data-nosnippet>202</a> }
<a href=#203 id=203 data-nosnippet>203</a> }
<a href=#204 id=204 data-nosnippet>204</a>
<a href=#205 id=205 data-nosnippet>205</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>inner_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>W {
<a href=#206 id=206 data-nosnippet>206</a> <span class="kw-2">&amp;mut </span><span class="self">self</span>.inner.as_mut().expect(<span class="string">"inner has gone away"</span>).inner
<a href=#207 id=207 data-nosnippet>207</a> }
<a href=#208 id=208 data-nosnippet>208</a>}
<a href=#209 id=209 data-nosnippet>209</a>
<a href=#210 id=210 data-nosnippet>210</a><span class="kw">impl</span>&lt;W, Q&gt; Future <span class="kw">for </span>PidfdReaper&lt;W, Q&gt;
<a href=#211 id=211 data-nosnippet>211</a><span class="kw">where
<a href=#212 id=212 data-nosnippet>212</a> </span>W: Wait + Unpin,
<a href=#213 id=213 data-nosnippet>213</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#214 id=214 data-nosnippet>214</a>{
<a href=#215 id=215 data-nosnippet>215</a> <span class="kw">type </span>Output = io::Result&lt;ExitStatus&gt;;
<a href=#216 id=216 data-nosnippet>216</a>
<a href=#217 id=217 data-nosnippet>217</a> <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
<a href=#218 id=218 data-nosnippet>218</a> Pin::new(
<a href=#219 id=219 data-nosnippet>219</a> Pin::into_inner(<span class="self">self</span>)
<a href=#220 id=220 data-nosnippet>220</a> .inner
<a href=#221 id=221 data-nosnippet>221</a> .as_mut()
<a href=#222 id=222 data-nosnippet>222</a> .expect(<span class="string">"inner has gone away"</span>),
<a href=#223 id=223 data-nosnippet>223</a> )
<a href=#224 id=224 data-nosnippet>224</a> .poll(cx)
<a href=#225 id=225 data-nosnippet>225</a> }
<a href=#226 id=226 data-nosnippet>226</a>}
<a href=#227 id=227 data-nosnippet>227</a>
<a href=#228 id=228 data-nosnippet>228</a><span class="kw">impl</span>&lt;W, Q&gt; Kill <span class="kw">for </span>PidfdReaper&lt;W, Q&gt;
<a href=#229 id=229 data-nosnippet>229</a><span class="kw">where
<a href=#230 id=230 data-nosnippet>230</a> </span>W: Wait + Unpin + Kill,
<a href=#231 id=231 data-nosnippet>231</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#232 id=232 data-nosnippet>232</a>{
<a href=#233 id=233 data-nosnippet>233</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#234 id=234 data-nosnippet>234</a> <span class="self">self</span>.inner_mut().kill()
<a href=#235 id=235 data-nosnippet>235</a> }
<a href=#236 id=236 data-nosnippet>236</a>}
<a href=#237 id=237 data-nosnippet>237</a>
<a href=#238 id=238 data-nosnippet>238</a><span class="kw">impl</span>&lt;W, Q&gt; Drop <span class="kw">for </span>PidfdReaper&lt;W, Q&gt;
<a href=#239 id=239 data-nosnippet>239</a><span class="kw">where
<a href=#240 id=240 data-nosnippet>240</a> </span>W: Wait + Unpin,
<a href=#241 id=241 data-nosnippet>241</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#242 id=242 data-nosnippet>242</a>{
<a href=#243 id=243 data-nosnippet>243</a> <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<a href=#244 id=244 data-nosnippet>244</a> <span class="kw">let </span><span class="kw-2">mut </span>orphan = <span class="self">self</span>.inner.take().expect(<span class="string">"inner has gone away"</span>).inner;
<a href=#245 id=245 data-nosnippet>245</a> <span class="kw">if let </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="kw">_</span>)) = orphan.try_wait() {
<a href=#246 id=246 data-nosnippet>246</a> <span class="kw">return</span>;
<a href=#247 id=247 data-nosnippet>247</a> }
<a href=#248 id=248 data-nosnippet>248</a>
<a href=#249 id=249 data-nosnippet>249</a> <span class="self">self</span>.orphan_queue.push_orphan(orphan);
<a href=#250 id=250 data-nosnippet>250</a> }
<a href=#251 id=251 data-nosnippet>251</a>}
<a href=#252 id=252 data-nosnippet>252</a>
<a href=#253 id=253 data-nosnippet>253</a><span class="attr">#[cfg(all(test, not(loom), not(miri)))]
<a href=#254 id=254 data-nosnippet>254</a></span><span class="kw">mod </span>test {
<a href=#255 id=255 data-nosnippet>255</a> <span class="kw">use super</span>::<span class="kw-2">*</span>;
<a href=#256 id=256 data-nosnippet>256</a> <span class="kw">use crate</span>::{
<a href=#257 id=257 data-nosnippet>257</a> process::unix::orphan::test::MockQueue,
<a href=#258 id=258 data-nosnippet>258</a> runtime::{Builder <span class="kw">as </span>RuntimeBuilder, Runtime},
<a href=#259 id=259 data-nosnippet>259</a> };
<a href=#260 id=260 data-nosnippet>260</a> <span class="kw">use </span>std::process::{Command, Output};
<a href=#261 id=261 data-nosnippet>261</a>
<a href=#262 id=262 data-nosnippet>262</a> <span class="kw">fn </span>create_runtime() -&gt; Runtime {
<a href=#263 id=263 data-nosnippet>263</a> RuntimeBuilder::new_current_thread()
<a href=#264 id=264 data-nosnippet>264</a> .enable_io()
<a href=#265 id=265 data-nosnippet>265</a> .build()
<a href=#266 id=266 data-nosnippet>266</a> .unwrap()
<a href=#267 id=267 data-nosnippet>267</a> }
<a href=#268 id=268 data-nosnippet>268</a>
<a href=#269 id=269 data-nosnippet>269</a> <span class="kw">fn </span>run_test(fut: <span class="kw">impl </span>Future&lt;Output = ()&gt;) {
<a href=#270 id=270 data-nosnippet>270</a> create_runtime().block_on(fut)
<a href=#271 id=271 data-nosnippet>271</a> }
<a href=#272 id=272 data-nosnippet>272</a>
<a href=#273 id=273 data-nosnippet>273</a> <span class="kw">fn </span>is_pidfd_available() -&gt; bool {
<a href=#274 id=274 data-nosnippet>274</a> <span class="kw">let </span>Output { stdout, status, .. } = Command::new(<span class="string">"uname"</span>).arg(<span class="string">"-r"</span>).output().unwrap();
<a href=#275 id=275 data-nosnippet>275</a> <span class="macro">assert!</span>(status.success());
<a href=#276 id=276 data-nosnippet>276</a> <span class="kw">let </span>stdout = String::from_utf8_lossy(<span class="kw-2">&amp;</span>stdout);
<a href=#277 id=277 data-nosnippet>277</a>
<a href=#278 id=278 data-nosnippet>278</a> <span class="kw">let </span><span class="kw-2">mut </span>kernel_version_iter = <span class="kw">match </span>stdout.split_once(<span class="string">'-'</span>) {
<a href=#279 id=279 data-nosnippet>279</a> <span class="prelude-val">Some</span>((version, <span class="kw">_</span>)) =&gt; version,
<a href=#280 id=280 data-nosnippet>280</a> <span class="kw">_ </span>=&gt; <span class="kw-2">&amp;</span>stdout,
<a href=#281 id=281 data-nosnippet>281</a> }
<a href=#282 id=282 data-nosnippet>282</a> .split(<span class="string">'.'</span>);
<a href=#283 id=283 data-nosnippet>283</a>
<a href=#284 id=284 data-nosnippet>284</a> <span class="kw">let </span>major: u32 = kernel_version_iter.next().unwrap().parse().unwrap();
<a href=#285 id=285 data-nosnippet>285</a> <span class="kw">let </span>minor: u32 = kernel_version_iter.next().unwrap().trim().parse().unwrap();
<a href=#286 id=286 data-nosnippet>286</a>
<a href=#287 id=287 data-nosnippet>287</a> major &gt;= <span class="number">6 </span>|| (major == <span class="number">5 </span>&amp;&amp; minor &gt;= <span class="number">10</span>)
<a href=#288 id=288 data-nosnippet>288</a> }
<a href=#289 id=289 data-nosnippet>289</a>
<a href=#290 id=290 data-nosnippet>290</a> <span class="attr">#[test]
<a href=#291 id=291 data-nosnippet>291</a> </span><span class="kw">fn </span>test_pidfd_reaper_poll() {
<a href=#292 id=292 data-nosnippet>292</a> <span class="kw">if </span>!is_pidfd_available() {
<a href=#293 id=293 data-nosnippet>293</a> <span class="macro">eprintln!</span>(<span class="string">"pidfd is not available on this linux kernel, skip this test"</span>);
<a href=#294 id=294 data-nosnippet>294</a> <span class="kw">return</span>;
<a href=#295 id=295 data-nosnippet>295</a> }
<a href=#296 id=296 data-nosnippet>296</a>
<a href=#297 id=297 data-nosnippet>297</a> <span class="kw">let </span>queue = MockQueue::new();
<a href=#298 id=298 data-nosnippet>298</a>
<a href=#299 id=299 data-nosnippet>299</a> run_test(<span class="kw">async </span>{
<a href=#300 id=300 data-nosnippet>300</a> <span class="kw">let </span>child = Command::new(<span class="string">"true"</span>).spawn().unwrap();
<a href=#301 id=301 data-nosnippet>301</a> <span class="kw">let </span>pidfd_reaper = PidfdReaper::new(child, <span class="kw-2">&amp;</span>queue).unwrap();
<a href=#302 id=302 data-nosnippet>302</a>
<a href=#303 id=303 data-nosnippet>303</a> <span class="kw">let </span>exit_status = pidfd_reaper.<span class="kw">await</span>.unwrap();
<a href=#304 id=304 data-nosnippet>304</a> <span class="macro">assert!</span>(exit_status.success());
<a href=#305 id=305 data-nosnippet>305</a> });
<a href=#306 id=306 data-nosnippet>306</a>
<a href=#307 id=307 data-nosnippet>307</a> <span class="macro">assert!</span>(queue.all_enqueued.borrow().is_empty());
<a href=#308 id=308 data-nosnippet>308</a> }
<a href=#309 id=309 data-nosnippet>309</a>
<a href=#310 id=310 data-nosnippet>310</a> <span class="attr">#[test]
<a href=#311 id=311 data-nosnippet>311</a> </span><span class="kw">fn </span>test_pidfd_reaper_kill() {
<a href=#312 id=312 data-nosnippet>312</a> <span class="kw">if </span>!is_pidfd_available() {
<a href=#313 id=313 data-nosnippet>313</a> <span class="macro">eprintln!</span>(<span class="string">"pidfd is not available on this linux kernel, skip this test"</span>);
<a href=#314 id=314 data-nosnippet>314</a> <span class="kw">return</span>;
<a href=#315 id=315 data-nosnippet>315</a> }
<a href=#316 id=316 data-nosnippet>316</a>
<a href=#317 id=317 data-nosnippet>317</a> <span class="kw">let </span>queue = MockQueue::new();
<a href=#318 id=318 data-nosnippet>318</a>
<a href=#319 id=319 data-nosnippet>319</a> run_test(<span class="kw">async </span>{
<a href=#320 id=320 data-nosnippet>320</a> <span class="kw">let </span>child = Command::new(<span class="string">"sleep"</span>).arg(<span class="string">"1800"</span>).spawn().unwrap();
<a href=#321 id=321 data-nosnippet>321</a> <span class="kw">let </span><span class="kw-2">mut </span>pidfd_reaper = PidfdReaper::new(child, <span class="kw-2">&amp;</span>queue).unwrap();
<a href=#322 id=322 data-nosnippet>322</a>
<a href=#323 id=323 data-nosnippet>323</a> pidfd_reaper.kill().unwrap();
<a href=#324 id=324 data-nosnippet>324</a>
<a href=#325 id=325 data-nosnippet>325</a> <span class="kw">let </span>exit_status = pidfd_reaper.<span class="kw">await</span>.unwrap();
<a href=#326 id=326 data-nosnippet>326</a> <span class="macro">assert!</span>(!exit_status.success());
<a href=#327 id=327 data-nosnippet>327</a> });
<a href=#328 id=328 data-nosnippet>328</a>
<a href=#329 id=329 data-nosnippet>329</a> <span class="macro">assert!</span>(queue.all_enqueued.borrow().is_empty());
<a href=#330 id=330 data-nosnippet>330</a> }
<a href=#331 id=331 data-nosnippet>331</a>
<a href=#332 id=332 data-nosnippet>332</a> <span class="attr">#[test]
<a href=#333 id=333 data-nosnippet>333</a> </span><span class="kw">fn </span>test_pidfd_reaper_drop() {
<a href=#334 id=334 data-nosnippet>334</a> <span class="kw">if </span>!is_pidfd_available() {
<a href=#335 id=335 data-nosnippet>335</a> <span class="macro">eprintln!</span>(<span class="string">"pidfd is not available on this linux kernel, skip this test"</span>);
<a href=#336 id=336 data-nosnippet>336</a> <span class="kw">return</span>;
<a href=#337 id=337 data-nosnippet>337</a> }
<a href=#338 id=338 data-nosnippet>338</a>
<a href=#339 id=339 data-nosnippet>339</a> <span class="kw">let </span>queue = MockQueue::new();
<a href=#340 id=340 data-nosnippet>340</a>
<a href=#341 id=341 data-nosnippet>341</a> <span class="kw">let </span><span class="kw-2">mut </span>child = Command::new(<span class="string">"sleep"</span>).arg(<span class="string">"1800"</span>).spawn().unwrap();
<a href=#342 id=342 data-nosnippet>342</a>
<a href=#343 id=343 data-nosnippet>343</a> run_test(<span class="kw">async </span>{
<a href=#344 id=344 data-nosnippet>344</a> <span class="kw">let </span>_pidfd_reaper = PidfdReaper::new(<span class="kw-2">&amp;mut </span>child, <span class="kw-2">&amp;</span>queue).unwrap();
<a href=#345 id=345 data-nosnippet>345</a> });
<a href=#346 id=346 data-nosnippet>346</a>
<a href=#347 id=347 data-nosnippet>347</a> <span class="macro">assert_eq!</span>(queue.all_enqueued.borrow().len(), <span class="number">1</span>);
<a href=#348 id=348 data-nosnippet>348</a>
<a href=#349 id=349 data-nosnippet>349</a> child.kill().unwrap();
<a href=#350 id=350 data-nosnippet>350</a> child.wait().unwrap();
<a href=#351 id=351 data-nosnippet>351</a> }
<a href=#352 id=352 data-nosnippet>352</a>}
</code></pre></div></section></main></body></html>
@@ -0,0 +1,299 @@
<!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 `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.49.0/src/process/unix/reap.rs`."><title>reap.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../../../static.files/storage-e2aeef58.js"></script><script defer src="../../../../static.files/src-script-813739b1.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">tokio/process/unix/</div>reap.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="kw">use </span><span class="kw">crate</span>::process::imp::orphan::{OrphanQueue, Wait};
<a href=#2 id=2 data-nosnippet>2</a><span class="kw">use </span><span class="kw">crate</span>::process::kill::Kill;
<a href=#3 id=3 data-nosnippet>3</a><span class="kw">use </span><span class="kw">crate</span>::signal::unix::InternalStream;
<a href=#4 id=4 data-nosnippet>4</a>
<a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>std::future::Future;
<a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>std::io;
<a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>std::ops::Deref;
<a href=#8 id=8 data-nosnippet>8</a><span class="kw">use </span>std::pin::Pin;
<a href=#9 id=9 data-nosnippet>9</a><span class="kw">use </span>std::process::ExitStatus;
<a href=#10 id=10 data-nosnippet>10</a><span class="kw">use </span>std::task::Context;
<a href=#11 id=11 data-nosnippet>11</a><span class="kw">use </span>std::task::Poll;
<a href=#12 id=12 data-nosnippet>12</a>
<a href=#13 id=13 data-nosnippet>13</a><span class="doccomment">/// Orchestrates between registering interest for receiving signals when a
<a href=#14 id=14 data-nosnippet>14</a>/// child process has exited, and attempting to poll for process completion.
<a href=#15 id=15 data-nosnippet>15</a></span><span class="attr">#[derive(Debug)]
<a href=#16 id=16 data-nosnippet>16</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Reaper&lt;W, Q, S&gt;
<a href=#17 id=17 data-nosnippet>17</a><span class="kw">where
<a href=#18 id=18 data-nosnippet>18</a> </span>W: Wait,
<a href=#19 id=19 data-nosnippet>19</a> Q: OrphanQueue&lt;W&gt;,
<a href=#20 id=20 data-nosnippet>20</a>{
<a href=#21 id=21 data-nosnippet>21</a> inner: <span class="prelude-ty">Option</span>&lt;W&gt;,
<a href=#22 id=22 data-nosnippet>22</a> orphan_queue: Q,
<a href=#23 id=23 data-nosnippet>23</a> signal: S,
<a href=#24 id=24 data-nosnippet>24</a>}
<a href=#25 id=25 data-nosnippet>25</a>
<a href=#26 id=26 data-nosnippet>26</a><span class="kw">impl</span>&lt;W, Q, S&gt; Deref <span class="kw">for </span>Reaper&lt;W, Q, S&gt;
<a href=#27 id=27 data-nosnippet>27</a><span class="kw">where
<a href=#28 id=28 data-nosnippet>28</a> </span>W: Wait,
<a href=#29 id=29 data-nosnippet>29</a> Q: OrphanQueue&lt;W&gt;,
<a href=#30 id=30 data-nosnippet>30</a>{
<a href=#31 id=31 data-nosnippet>31</a> <span class="kw">type </span>Target = W;
<a href=#32 id=32 data-nosnippet>32</a>
<a href=#33 id=33 data-nosnippet>33</a> <span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="self">Self</span>::Target {
<a href=#34 id=34 data-nosnippet>34</a> <span class="self">self</span>.inner()
<a href=#35 id=35 data-nosnippet>35</a> }
<a href=#36 id=36 data-nosnippet>36</a>}
<a href=#37 id=37 data-nosnippet>37</a>
<a href=#38 id=38 data-nosnippet>38</a><span class="kw">impl</span>&lt;W, Q, S&gt; Reaper&lt;W, Q, S&gt;
<a href=#39 id=39 data-nosnippet>39</a><span class="kw">where
<a href=#40 id=40 data-nosnippet>40</a> </span>W: Wait,
<a href=#41 id=41 data-nosnippet>41</a> Q: OrphanQueue&lt;W&gt;,
<a href=#42 id=42 data-nosnippet>42</a>{
<a href=#43 id=43 data-nosnippet>43</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(inner: W, orphan_queue: Q, signal: S) -&gt; <span class="self">Self </span>{
<a href=#44 id=44 data-nosnippet>44</a> <span class="self">Self </span>{
<a href=#45 id=45 data-nosnippet>45</a> inner: <span class="prelude-val">Some</span>(inner),
<a href=#46 id=46 data-nosnippet>46</a> orphan_queue,
<a href=#47 id=47 data-nosnippet>47</a> signal,
<a href=#48 id=48 data-nosnippet>48</a> }
<a href=#49 id=49 data-nosnippet>49</a> }
<a href=#50 id=50 data-nosnippet>50</a>
<a href=#51 id=51 data-nosnippet>51</a> <span class="kw">fn </span>inner(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>W {
<a href=#52 id=52 data-nosnippet>52</a> <span class="self">self</span>.inner.as_ref().expect(<span class="string">"inner has gone away"</span>)
<a href=#53 id=53 data-nosnippet>53</a> }
<a href=#54 id=54 data-nosnippet>54</a>
<a href=#55 id=55 data-nosnippet>55</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>inner_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>W {
<a href=#56 id=56 data-nosnippet>56</a> <span class="self">self</span>.inner.as_mut().expect(<span class="string">"inner has gone away"</span>)
<a href=#57 id=57 data-nosnippet>57</a> }
<a href=#58 id=58 data-nosnippet>58</a>}
<a href=#59 id=59 data-nosnippet>59</a>
<a href=#60 id=60 data-nosnippet>60</a><span class="kw">impl</span>&lt;W, Q, S&gt; Future <span class="kw">for </span>Reaper&lt;W, Q, S&gt;
<a href=#61 id=61 data-nosnippet>61</a><span class="kw">where
<a href=#62 id=62 data-nosnippet>62</a> </span>W: Wait + Unpin,
<a href=#63 id=63 data-nosnippet>63</a> Q: OrphanQueue&lt;W&gt; + Unpin,
<a href=#64 id=64 data-nosnippet>64</a> S: InternalStream + Unpin,
<a href=#65 id=65 data-nosnippet>65</a>{
<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">type </span>Output = io::Result&lt;ExitStatus&gt;;
<a href=#67 id=67 data-nosnippet>67</a>
<a href=#68 id=68 data-nosnippet>68</a> <span class="kw">fn </span>poll(<span class="kw-2">mut </span><span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
<a href=#69 id=69 data-nosnippet>69</a> <span class="kw">loop </span>{
<a href=#70 id=70 data-nosnippet>70</a> <span class="comment">// If the child hasn't exited yet, then it's our responsibility to
<a href=#71 id=71 data-nosnippet>71</a> // ensure the current task gets notified when it might be able to
<a href=#72 id=72 data-nosnippet>72</a> // make progress. We can use the delivery of a SIGCHLD signal as a
<a href=#73 id=73 data-nosnippet>73</a> // sign that we can potentially make progress.
<a href=#74 id=74 data-nosnippet>74</a> //
<a href=#75 id=75 data-nosnippet>75</a> // However, we will register for a notification on the next signal
<a href=#76 id=76 data-nosnippet>76</a> // BEFORE we poll the child. Otherwise it is possible that the child
<a href=#77 id=77 data-nosnippet>77</a> // can exit and the signal can arrive after we last polled the child,
<a href=#78 id=78 data-nosnippet>78</a> // but before we've registered for a notification on the next signal
<a href=#79 id=79 data-nosnippet>79</a> // (this can cause a deadlock if there are no more spawned children
<a href=#80 id=80 data-nosnippet>80</a> // which can generate a different signal for us). A side effect of
<a href=#81 id=81 data-nosnippet>81</a> // pre-registering for signal notifications is that when the child
<a href=#82 id=82 data-nosnippet>82</a> // exits, we will have already registered for an additional
<a href=#83 id=83 data-nosnippet>83</a> // notification we don't need to consume. If another signal arrives,
<a href=#84 id=84 data-nosnippet>84</a> // this future's task will be notified/woken up again. Since the
<a href=#85 id=85 data-nosnippet>85</a> // futures model allows for spurious wake ups this extra wakeup
<a href=#86 id=86 data-nosnippet>86</a> // should not cause significant issues with parent futures.
<a href=#87 id=87 data-nosnippet>87</a> </span><span class="kw">let </span>registered_interest = <span class="self">self</span>.signal.poll_recv(cx).is_pending();
<a href=#88 id=88 data-nosnippet>88</a>
<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(status) = <span class="self">self</span>.inner_mut().try_wait()<span class="question-mark">? </span>{
<a href=#90 id=90 data-nosnippet>90</a> <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(status));
<a href=#91 id=91 data-nosnippet>91</a> }
<a href=#92 id=92 data-nosnippet>92</a>
<a href=#93 id=93 data-nosnippet>93</a> <span class="comment">// If our attempt to poll for the next signal was not ready, then
<a href=#94 id=94 data-nosnippet>94</a> // we've arranged for our task to get notified and we can bail out.
<a href=#95 id=95 data-nosnippet>95</a> </span><span class="kw">if </span>registered_interest {
<a href=#96 id=96 data-nosnippet>96</a> <span class="kw">return </span>Poll::Pending;
<a href=#97 id=97 data-nosnippet>97</a> } <span class="kw">else </span>{
<a href=#98 id=98 data-nosnippet>98</a> <span class="comment">// Otherwise, if the signal stream delivered a signal to us, we
<a href=#99 id=99 data-nosnippet>99</a> // won't get notified at the next signal, so we'll loop and try
<a href=#100 id=100 data-nosnippet>100</a> // again.
<a href=#101 id=101 data-nosnippet>101</a> </span><span class="kw">continue</span>;
<a href=#102 id=102 data-nosnippet>102</a> }
<a href=#103 id=103 data-nosnippet>103</a> }
<a href=#104 id=104 data-nosnippet>104</a> }
<a href=#105 id=105 data-nosnippet>105</a>}
<a href=#106 id=106 data-nosnippet>106</a>
<a href=#107 id=107 data-nosnippet>107</a><span class="kw">impl</span>&lt;W, Q, S&gt; Kill <span class="kw">for </span>Reaper&lt;W, Q, S&gt;
<a href=#108 id=108 data-nosnippet>108</a><span class="kw">where
<a href=#109 id=109 data-nosnippet>109</a> </span>W: Kill + Wait,
<a href=#110 id=110 data-nosnippet>110</a> Q: OrphanQueue&lt;W&gt;,
<a href=#111 id=111 data-nosnippet>111</a>{
<a href=#112 id=112 data-nosnippet>112</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#113 id=113 data-nosnippet>113</a> <span class="self">self</span>.inner_mut().kill()
<a href=#114 id=114 data-nosnippet>114</a> }
<a href=#115 id=115 data-nosnippet>115</a>}
<a href=#116 id=116 data-nosnippet>116</a>
<a href=#117 id=117 data-nosnippet>117</a><span class="kw">impl</span>&lt;W, Q, S&gt; Drop <span class="kw">for </span>Reaper&lt;W, Q, S&gt;
<a href=#118 id=118 data-nosnippet>118</a><span class="kw">where
<a href=#119 id=119 data-nosnippet>119</a> </span>W: Wait,
<a href=#120 id=120 data-nosnippet>120</a> Q: OrphanQueue&lt;W&gt;,
<a href=#121 id=121 data-nosnippet>121</a>{
<a href=#122 id=122 data-nosnippet>122</a> <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<a href=#123 id=123 data-nosnippet>123</a> <span class="kw">if let </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="kw">_</span>)) = <span class="self">self</span>.inner_mut().try_wait() {
<a href=#124 id=124 data-nosnippet>124</a> <span class="kw">return</span>;
<a href=#125 id=125 data-nosnippet>125</a> }
<a href=#126 id=126 data-nosnippet>126</a>
<a href=#127 id=127 data-nosnippet>127</a> <span class="kw">let </span>orphan = <span class="self">self</span>.inner.take().unwrap();
<a href=#128 id=128 data-nosnippet>128</a> <span class="self">self</span>.orphan_queue.push_orphan(orphan);
<a href=#129 id=129 data-nosnippet>129</a> }
<a href=#130 id=130 data-nosnippet>130</a>}
<a href=#131 id=131 data-nosnippet>131</a>
<a href=#132 id=132 data-nosnippet>132</a><span class="attr">#[cfg(all(test, not(loom)))]
<a href=#133 id=133 data-nosnippet>133</a></span><span class="kw">mod </span>test {
<a href=#134 id=134 data-nosnippet>134</a> <span class="kw">use super</span>::<span class="kw-2">*</span>;
<a href=#135 id=135 data-nosnippet>135</a>
<a href=#136 id=136 data-nosnippet>136</a> <span class="kw">use </span><span class="kw">crate</span>::process::unix::orphan::test::MockQueue;
<a href=#137 id=137 data-nosnippet>137</a> <span class="kw">use </span>futures::future::FutureExt;
<a href=#138 id=138 data-nosnippet>138</a> <span class="kw">use </span>std::os::unix::process::ExitStatusExt;
<a href=#139 id=139 data-nosnippet>139</a> <span class="kw">use </span>std::process::ExitStatus;
<a href=#140 id=140 data-nosnippet>140</a> <span class="kw">use </span>std::task::Context;
<a href=#141 id=141 data-nosnippet>141</a> <span class="kw">use </span>std::task::Poll;
<a href=#142 id=142 data-nosnippet>142</a>
<a href=#143 id=143 data-nosnippet>143</a> <span class="attr">#[derive(Debug)]
<a href=#144 id=144 data-nosnippet>144</a> </span><span class="kw">struct </span>MockWait {
<a href=#145 id=145 data-nosnippet>145</a> total_kills: usize,
<a href=#146 id=146 data-nosnippet>146</a> total_waits: usize,
<a href=#147 id=147 data-nosnippet>147</a> num_wait_until_status: usize,
<a href=#148 id=148 data-nosnippet>148</a> status: ExitStatus,
<a href=#149 id=149 data-nosnippet>149</a> }
<a href=#150 id=150 data-nosnippet>150</a>
<a href=#151 id=151 data-nosnippet>151</a> <span class="kw">impl </span>MockWait {
<a href=#152 id=152 data-nosnippet>152</a> <span class="kw">fn </span>new(status: ExitStatus, num_wait_until_status: usize) -&gt; <span class="self">Self </span>{
<a href=#153 id=153 data-nosnippet>153</a> <span class="self">Self </span>{
<a href=#154 id=154 data-nosnippet>154</a> total_kills: <span class="number">0</span>,
<a href=#155 id=155 data-nosnippet>155</a> total_waits: <span class="number">0</span>,
<a href=#156 id=156 data-nosnippet>156</a> num_wait_until_status,
<a href=#157 id=157 data-nosnippet>157</a> status,
<a href=#158 id=158 data-nosnippet>158</a> }
<a href=#159 id=159 data-nosnippet>159</a> }
<a href=#160 id=160 data-nosnippet>160</a> }
<a href=#161 id=161 data-nosnippet>161</a>
<a href=#162 id=162 data-nosnippet>162</a> <span class="kw">impl </span>Wait <span class="kw">for </span>MockWait {
<a href=#163 id=163 data-nosnippet>163</a> <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
<a href=#164 id=164 data-nosnippet>164</a> <span class="number">0
<a href=#165 id=165 data-nosnippet>165</a> </span>}
<a href=#166 id=166 data-nosnippet>166</a>
<a href=#167 id=167 data-nosnippet>167</a> <span class="kw">fn </span>try_wait(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;<span class="prelude-ty">Option</span>&lt;ExitStatus&gt;&gt; {
<a href=#168 id=168 data-nosnippet>168</a> <span class="kw">let </span>ret = <span class="kw">if </span><span class="self">self</span>.num_wait_until_status == <span class="self">self</span>.total_waits {
<a href=#169 id=169 data-nosnippet>169</a> <span class="prelude-val">Some</span>(<span class="self">self</span>.status)
<a href=#170 id=170 data-nosnippet>170</a> } <span class="kw">else </span>{
<a href=#171 id=171 data-nosnippet>171</a> <span class="prelude-val">None
<a href=#172 id=172 data-nosnippet>172</a> </span>};
<a href=#173 id=173 data-nosnippet>173</a>
<a href=#174 id=174 data-nosnippet>174</a> <span class="self">self</span>.total_waits += <span class="number">1</span>;
<a href=#175 id=175 data-nosnippet>175</a> <span class="prelude-val">Ok</span>(ret)
<a href=#176 id=176 data-nosnippet>176</a> }
<a href=#177 id=177 data-nosnippet>177</a> }
<a href=#178 id=178 data-nosnippet>178</a>
<a href=#179 id=179 data-nosnippet>179</a> <span class="kw">impl </span>Kill <span class="kw">for </span>MockWait {
<a href=#180 id=180 data-nosnippet>180</a> <span class="kw">fn </span>kill(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<a href=#181 id=181 data-nosnippet>181</a> <span class="self">self</span>.total_kills += <span class="number">1</span>;
<a href=#182 id=182 data-nosnippet>182</a> <span class="prelude-val">Ok</span>(())
<a href=#183 id=183 data-nosnippet>183</a> }
<a href=#184 id=184 data-nosnippet>184</a> }
<a href=#185 id=185 data-nosnippet>185</a>
<a href=#186 id=186 data-nosnippet>186</a> <span class="kw">struct </span>MockStream {
<a href=#187 id=187 data-nosnippet>187</a> total_polls: usize,
<a href=#188 id=188 data-nosnippet>188</a> values: Vec&lt;<span class="prelude-ty">Option</span>&lt;()&gt;&gt;,
<a href=#189 id=189 data-nosnippet>189</a> }
<a href=#190 id=190 data-nosnippet>190</a>
<a href=#191 id=191 data-nosnippet>191</a> <span class="kw">impl </span>MockStream {
<a href=#192 id=192 data-nosnippet>192</a> <span class="kw">fn </span>new(values: Vec&lt;<span class="prelude-ty">Option</span>&lt;()&gt;&gt;) -&gt; <span class="self">Self </span>{
<a href=#193 id=193 data-nosnippet>193</a> <span class="self">Self </span>{
<a href=#194 id=194 data-nosnippet>194</a> total_polls: <span class="number">0</span>,
<a href=#195 id=195 data-nosnippet>195</a> values,
<a href=#196 id=196 data-nosnippet>196</a> }
<a href=#197 id=197 data-nosnippet>197</a> }
<a href=#198 id=198 data-nosnippet>198</a> }
<a href=#199 id=199 data-nosnippet>199</a>
<a href=#200 id=200 data-nosnippet>200</a> <span class="kw">impl </span>InternalStream <span class="kw">for </span>MockStream {
<a href=#201 id=201 data-nosnippet>201</a> <span class="kw">fn </span>poll_recv(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">'_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;()&gt;&gt; {
<a href=#202 id=202 data-nosnippet>202</a> <span class="self">self</span>.total_polls += <span class="number">1</span>;
<a href=#203 id=203 data-nosnippet>203</a> <span class="kw">match </span><span class="self">self</span>.values.remove(<span class="number">0</span>) {
<a href=#204 id=204 data-nosnippet>204</a> <span class="prelude-val">Some</span>(()) =&gt; Poll::Ready(<span class="prelude-val">Some</span>(())),
<a href=#205 id=205 data-nosnippet>205</a> <span class="prelude-val">None </span>=&gt; Poll::Pending,
<a href=#206 id=206 data-nosnippet>206</a> }
<a href=#207 id=207 data-nosnippet>207</a> }
<a href=#208 id=208 data-nosnippet>208</a> }
<a href=#209 id=209 data-nosnippet>209</a>
<a href=#210 id=210 data-nosnippet>210</a> <span class="attr">#[test]
<a href=#211 id=211 data-nosnippet>211</a> </span><span class="kw">fn </span>reaper() {
<a href=#212 id=212 data-nosnippet>212</a> <span class="kw">let </span>exit = ExitStatus::from_raw(<span class="number">0</span>);
<a href=#213 id=213 data-nosnippet>213</a> <span class="kw">let </span>mock = MockWait::new(exit, <span class="number">3</span>);
<a href=#214 id=214 data-nosnippet>214</a> <span class="kw">let </span><span class="kw-2">mut </span>grim = Reaper::new(
<a href=#215 id=215 data-nosnippet>215</a> mock,
<a href=#216 id=216 data-nosnippet>216</a> MockQueue::new(),
<a href=#217 id=217 data-nosnippet>217</a> MockStream::new(<span class="macro">vec!</span>[<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(()), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>]),
<a href=#218 id=218 data-nosnippet>218</a> );
<a href=#219 id=219 data-nosnippet>219</a>
<a href=#220 id=220 data-nosnippet>220</a> <span class="kw">let </span>waker = futures::task::noop_waker();
<a href=#221 id=221 data-nosnippet>221</a> <span class="kw">let </span><span class="kw-2">mut </span>context = Context::from_waker(<span class="kw-2">&amp;</span>waker);
<a href=#222 id=222 data-nosnippet>222</a>
<a href=#223 id=223 data-nosnippet>223</a> <span class="comment">// Not yet exited, interest registered
<a href=#224 id=224 data-nosnippet>224</a> </span><span class="macro">assert!</span>(grim.poll_unpin(<span class="kw-2">&amp;mut </span>context).is_pending());
<a href=#225 id=225 data-nosnippet>225</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, grim.signal.total_polls);
<a href=#226 id=226 data-nosnippet>226</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, grim.total_waits);
<a href=#227 id=227 data-nosnippet>227</a> <span class="macro">assert!</span>(grim.orphan_queue.all_enqueued.borrow().is_empty());
<a href=#228 id=228 data-nosnippet>228</a>
<a href=#229 id=229 data-nosnippet>229</a> <span class="comment">// Not yet exited, couldn't register interest the first time
<a href=#230 id=230 data-nosnippet>230</a> // but managed to register interest the second time around
<a href=#231 id=231 data-nosnippet>231</a> </span><span class="macro">assert!</span>(grim.poll_unpin(<span class="kw-2">&amp;mut </span>context).is_pending());
<a href=#232 id=232 data-nosnippet>232</a> <span class="macro">assert_eq!</span>(<span class="number">3</span>, grim.signal.total_polls);
<a href=#233 id=233 data-nosnippet>233</a> <span class="macro">assert_eq!</span>(<span class="number">3</span>, grim.total_waits);
<a href=#234 id=234 data-nosnippet>234</a> <span class="macro">assert!</span>(grim.orphan_queue.all_enqueued.borrow().is_empty());
<a href=#235 id=235 data-nosnippet>235</a>
<a href=#236 id=236 data-nosnippet>236</a> <span class="comment">// Exited
<a href=#237 id=237 data-nosnippet>237</a> </span><span class="kw">if let </span>Poll::Ready(r) = grim.poll_unpin(<span class="kw-2">&amp;mut </span>context) {
<a href=#238 id=238 data-nosnippet>238</a> <span class="macro">assert!</span>(r.is_ok());
<a href=#239 id=239 data-nosnippet>239</a> <span class="kw">let </span>exit_code = r.unwrap();
<a href=#240 id=240 data-nosnippet>240</a> <span class="macro">assert_eq!</span>(exit_code, exit);
<a href=#241 id=241 data-nosnippet>241</a> } <span class="kw">else </span>{
<a href=#242 id=242 data-nosnippet>242</a> <span class="macro">unreachable!</span>();
<a href=#243 id=243 data-nosnippet>243</a> }
<a href=#244 id=244 data-nosnippet>244</a> <span class="macro">assert_eq!</span>(<span class="number">4</span>, grim.signal.total_polls);
<a href=#245 id=245 data-nosnippet>245</a> <span class="macro">assert_eq!</span>(<span class="number">4</span>, grim.total_waits);
<a href=#246 id=246 data-nosnippet>246</a> <span class="macro">assert!</span>(grim.orphan_queue.all_enqueued.borrow().is_empty());
<a href=#247 id=247 data-nosnippet>247</a> }
<a href=#248 id=248 data-nosnippet>248</a>
<a href=#249 id=249 data-nosnippet>249</a> <span class="attr">#[test]
<a href=#250 id=250 data-nosnippet>250</a> </span><span class="kw">fn </span>kill() {
<a href=#251 id=251 data-nosnippet>251</a> <span class="kw">let </span>exit = ExitStatus::from_raw(<span class="number">0</span>);
<a href=#252 id=252 data-nosnippet>252</a> <span class="kw">let </span><span class="kw-2">mut </span>grim = Reaper::new(
<a href=#253 id=253 data-nosnippet>253</a> MockWait::new(exit, <span class="number">0</span>),
<a href=#254 id=254 data-nosnippet>254</a> MockQueue::new(),
<a href=#255 id=255 data-nosnippet>255</a> MockStream::new(<span class="macro">vec!</span>[<span class="prelude-val">None</span>]),
<a href=#256 id=256 data-nosnippet>256</a> );
<a href=#257 id=257 data-nosnippet>257</a>
<a href=#258 id=258 data-nosnippet>258</a> grim.kill().unwrap();
<a href=#259 id=259 data-nosnippet>259</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, grim.total_kills);
<a href=#260 id=260 data-nosnippet>260</a> <span class="macro">assert!</span>(grim.orphan_queue.all_enqueued.borrow().is_empty());
<a href=#261 id=261 data-nosnippet>261</a> }
<a href=#262 id=262 data-nosnippet>262</a>
<a href=#263 id=263 data-nosnippet>263</a> <span class="attr">#[test]
<a href=#264 id=264 data-nosnippet>264</a> </span><span class="kw">fn </span>drop_reaps_if_possible() {
<a href=#265 id=265 data-nosnippet>265</a> <span class="kw">let </span>exit = ExitStatus::from_raw(<span class="number">0</span>);
<a href=#266 id=266 data-nosnippet>266</a> <span class="kw">let </span><span class="kw-2">mut </span>mock = MockWait::new(exit, <span class="number">0</span>);
<a href=#267 id=267 data-nosnippet>267</a>
<a href=#268 id=268 data-nosnippet>268</a> {
<a href=#269 id=269 data-nosnippet>269</a> <span class="kw">let </span>queue = MockQueue::new();
<a href=#270 id=270 data-nosnippet>270</a>
<a href=#271 id=271 data-nosnippet>271</a> <span class="kw">let </span>grim = Reaper::new(<span class="kw-2">&amp;mut </span>mock, <span class="kw-2">&amp;</span>queue, MockStream::new(<span class="macro">vec!</span>[]));
<a href=#272 id=272 data-nosnippet>272</a>
<a href=#273 id=273 data-nosnippet>273</a> drop(grim);
<a href=#274 id=274 data-nosnippet>274</a>
<a href=#275 id=275 data-nosnippet>275</a> <span class="macro">assert!</span>(queue.all_enqueued.borrow().is_empty());
<a href=#276 id=276 data-nosnippet>276</a> }
<a href=#277 id=277 data-nosnippet>277</a>
<a href=#278 id=278 data-nosnippet>278</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, mock.total_waits);
<a href=#279 id=279 data-nosnippet>279</a> <span class="macro">assert_eq!</span>(<span class="number">0</span>, mock.total_kills);
<a href=#280 id=280 data-nosnippet>280</a> }
<a href=#281 id=281 data-nosnippet>281</a>
<a href=#282 id=282 data-nosnippet>282</a> <span class="attr">#[test]
<a href=#283 id=283 data-nosnippet>283</a> </span><span class="kw">fn </span>drop_enqueues_orphan_if_wait_fails() {
<a href=#284 id=284 data-nosnippet>284</a> <span class="kw">let </span>exit = ExitStatus::from_raw(<span class="number">0</span>);
<a href=#285 id=285 data-nosnippet>285</a> <span class="kw">let </span><span class="kw-2">mut </span>mock = MockWait::new(exit, <span class="number">2</span>);
<a href=#286 id=286 data-nosnippet>286</a>
<a href=#287 id=287 data-nosnippet>287</a> {
<a href=#288 id=288 data-nosnippet>288</a> <span class="kw">let </span>queue = MockQueue::&lt;<span class="kw-2">&amp;mut </span>MockWait&gt;::new();
<a href=#289 id=289 data-nosnippet>289</a> <span class="kw">let </span>grim = Reaper::new(<span class="kw-2">&amp;mut </span>mock, <span class="kw-2">&amp;</span>queue, MockStream::new(<span class="macro">vec!</span>[]));
<a href=#290 id=290 data-nosnippet>290</a> drop(grim);
<a href=#291 id=291 data-nosnippet>291</a>
<a href=#292 id=292 data-nosnippet>292</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, queue.all_enqueued.borrow().len());
<a href=#293 id=293 data-nosnippet>293</a> }
<a href=#294 id=294 data-nosnippet>294</a>
<a href=#295 id=295 data-nosnippet>295</a> <span class="macro">assert_eq!</span>(<span class="number">1</span>, mock.total_waits);
<a href=#296 id=296 data-nosnippet>296</a> <span class="macro">assert_eq!</span>(<span class="number">0</span>, mock.total_kills);
<a href=#297 id=297 data-nosnippet>297</a> }
<a href=#298 id=298 data-nosnippet>298</a>}
</code></pre></div></section></main></body></html>