| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/signal-hook-0.1.17/src/iterator.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>iterator.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../signal_hook/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../signal_hook/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| <span id="411">411</span> |
| <span id="412">412</span> |
| <span id="413">413</span> |
| <span id="414">414</span> |
| <span id="415">415</span> |
| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| <span id="422">422</span> |
| <span id="423">423</span> |
| <span id="424">424</span> |
| <span id="425">425</span> |
| <span id="426">426</span> |
| <span id="427">427</span> |
| <span id="428">428</span> |
| <span id="429">429</span> |
| <span id="430">430</span> |
| <span id="431">431</span> |
| <span id="432">432</span> |
| <span id="433">433</span> |
| <span id="434">434</span> |
| <span id="435">435</span> |
| <span id="436">436</span> |
| <span id="437">437</span> |
| <span id="438">438</span> |
| <span id="439">439</span> |
| <span id="440">440</span> |
| <span id="441">441</span> |
| <span id="442">442</span> |
| <span id="443">443</span> |
| <span id="444">444</span> |
| <span id="445">445</span> |
| <span id="446">446</span> |
| <span id="447">447</span> |
| <span id="448">448</span> |
| <span id="449">449</span> |
| <span id="450">450</span> |
| <span id="451">451</span> |
| <span id="452">452</span> |
| <span id="453">453</span> |
| <span id="454">454</span> |
| <span id="455">455</span> |
| <span id="456">456</span> |
| <span id="457">457</span> |
| <span id="458">458</span> |
| <span id="459">459</span> |
| <span id="460">460</span> |
| <span id="461">461</span> |
| <span id="462">462</span> |
| <span id="463">463</span> |
| <span id="464">464</span> |
| <span id="465">465</span> |
| <span id="466">466</span> |
| <span id="467">467</span> |
| <span id="468">468</span> |
| <span id="469">469</span> |
| <span id="470">470</span> |
| <span id="471">471</span> |
| <span id="472">472</span> |
| <span id="473">473</span> |
| <span id="474">474</span> |
| <span id="475">475</span> |
| <span id="476">476</span> |
| <span id="477">477</span> |
| <span id="478">478</span> |
| <span id="479">479</span> |
| <span id="480">480</span> |
| <span id="481">481</span> |
| <span id="482">482</span> |
| <span id="483">483</span> |
| <span id="484">484</span> |
| <span id="485">485</span> |
| <span id="486">486</span> |
| <span id="487">487</span> |
| <span id="488">488</span> |
| <span id="489">489</span> |
| <span id="490">490</span> |
| <span id="491">491</span> |
| <span id="492">492</span> |
| <span id="493">493</span> |
| <span id="494">494</span> |
| <span id="495">495</span> |
| <span id="496">496</span> |
| <span id="497">497</span> |
| <span id="498">498</span> |
| <span id="499">499</span> |
| <span id="500">500</span> |
| <span id="501">501</span> |
| <span id="502">502</span> |
| <span id="503">503</span> |
| <span id="504">504</span> |
| <span id="505">505</span> |
| <span id="506">506</span> |
| <span id="507">507</span> |
| <span id="508">508</span> |
| <span id="509">509</span> |
| <span id="510">510</span> |
| <span id="511">511</span> |
| <span id="512">512</span> |
| <span id="513">513</span> |
| <span id="514">514</span> |
| <span id="515">515</span> |
| <span id="516">516</span> |
| <span id="517">517</span> |
| <span id="518">518</span> |
| <span id="519">519</span> |
| <span id="520">520</span> |
| <span id="521">521</span> |
| <span id="522">522</span> |
| <span id="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| <span id="526">526</span> |
| <span id="527">527</span> |
| <span id="528">528</span> |
| <span id="529">529</span> |
| <span id="530">530</span> |
| <span id="531">531</span> |
| <span id="532">532</span> |
| <span id="533">533</span> |
| <span id="534">534</span> |
| <span id="535">535</span> |
| <span id="536">536</span> |
| <span id="537">537</span> |
| <span id="538">538</span> |
| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
| <span id="545">545</span> |
| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
| <span id="550">550</span> |
| <span id="551">551</span> |
| <span id="552">552</span> |
| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
| <span id="556">556</span> |
| <span id="557">557</span> |
| <span id="558">558</span> |
| <span id="559">559</span> |
| <span id="560">560</span> |
| <span id="561">561</span> |
| <span id="562">562</span> |
| <span id="563">563</span> |
| <span id="564">564</span> |
| <span id="565">565</span> |
| <span id="566">566</span> |
| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| <span id="572">572</span> |
| <span id="573">573</span> |
| <span id="574">574</span> |
| <span id="575">575</span> |
| <span id="576">576</span> |
| <span id="577">577</span> |
| <span id="578">578</span> |
| <span id="579">579</span> |
| <span id="580">580</span> |
| <span id="581">581</span> |
| <span id="582">582</span> |
| <span id="583">583</span> |
| <span id="584">584</span> |
| <span id="585">585</span> |
| <span id="586">586</span> |
| <span id="587">587</span> |
| <span id="588">588</span> |
| <span id="589">589</span> |
| <span id="590">590</span> |
| <span id="591">591</span> |
| <span id="592">592</span> |
| <span id="593">593</span> |
| <span id="594">594</span> |
| <span id="595">595</span> |
| <span id="596">596</span> |
| <span id="597">597</span> |
| <span id="598">598</span> |
| <span id="599">599</span> |
| <span id="600">600</span> |
| <span id="601">601</span> |
| <span id="602">602</span> |
| <span id="603">603</span> |
| <span id="604">604</span> |
| <span id="605">605</span> |
| <span id="606">606</span> |
| <span id="607">607</span> |
| <span id="608">608</span> |
| <span id="609">609</span> |
| <span id="610">610</span> |
| <span id="611">611</span> |
| <span id="612">612</span> |
| <span id="613">613</span> |
| <span id="614">614</span> |
| <span id="615">615</span> |
| <span id="616">616</span> |
| <span id="617">617</span> |
| <span id="618">618</span> |
| <span id="619">619</span> |
| <span id="620">620</span> |
| <span id="621">621</span> |
| <span id="622">622</span> |
| <span id="623">623</span> |
| <span id="624">624</span> |
| <span id="625">625</span> |
| <span id="626">626</span> |
| <span id="627">627</span> |
| <span id="628">628</span> |
| <span id="629">629</span> |
| <span id="630">630</span> |
| <span id="631">631</span> |
| <span id="632">632</span> |
| <span id="633">633</span> |
| <span id="634">634</span> |
| <span id="635">635</span> |
| <span id="636">636</span> |
| <span id="637">637</span> |
| <span id="638">638</span> |
| <span id="639">639</span> |
| <span id="640">640</span> |
| <span id="641">641</span> |
| <span id="642">642</span> |
| <span id="643">643</span> |
| <span id="644">644</span> |
| <span id="645">645</span> |
| <span id="646">646</span> |
| <span id="647">647</span> |
| <span id="648">648</span> |
| <span id="649">649</span> |
| <span id="650">650</span> |
| <span id="651">651</span> |
| <span id="652">652</span> |
| <span id="653">653</span> |
| <span id="654">654</span> |
| <span id="655">655</span> |
| <span id="656">656</span> |
| <span id="657">657</span> |
| <span id="658">658</span> |
| <span id="659">659</span> |
| <span id="660">660</span> |
| <span id="661">661</span> |
| <span id="662">662</span> |
| <span id="663">663</span> |
| <span id="664">664</span> |
| <span id="665">665</span> |
| <span id="666">666</span> |
| <span id="667">667</span> |
| <span id="668">668</span> |
| <span id="669">669</span> |
| <span id="670">670</span> |
| <span id="671">671</span> |
| <span id="672">672</span> |
| <span id="673">673</span> |
| <span id="674">674</span> |
| <span id="675">675</span> |
| <span id="676">676</span> |
| <span id="677">677</span> |
| <span id="678">678</span> |
| <span id="679">679</span> |
| <span id="680">680</span> |
| <span id="681">681</span> |
| <span id="682">682</span> |
| <span id="683">683</span> |
| <span id="684">684</span> |
| <span id="685">685</span> |
| <span id="686">686</span> |
| <span id="687">687</span> |
| <span id="688">688</span> |
| <span id="689">689</span> |
| <span id="690">690</span> |
| <span id="691">691</span> |
| <span id="692">692</span> |
| <span id="693">693</span> |
| <span id="694">694</span> |
| <span id="695">695</span> |
| <span id="696">696</span> |
| <span id="697">697</span> |
| <span id="698">698</span> |
| <span id="699">699</span> |
| <span id="700">700</span> |
| <span id="701">701</span> |
| <span id="702">702</span> |
| <span id="703">703</span> |
| <span id="704">704</span> |
| <span id="705">705</span> |
| <span id="706">706</span> |
| <span id="707">707</span> |
| <span id="708">708</span> |
| <span id="709">709</span> |
| <span id="710">710</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! An iterator over incoming signals. |
| //! |
| //! This provides a higher abstraction over the signals, providing a structure |
| //! ([`Signals`](struct.Signals.html)) able to iterate over the incoming signals. |
| //! |
| //! In case the `tokio-support` feature is turned on, the [`Async`](struct.Async.html) is also |
| //! available, making it possible to integrate with the tokio runtime. |
| //! |
| //! # Examples |
| //! |
| //! ```rust |
| //! extern crate libc; |
| //! extern crate signal_hook; |
| //! |
| //! use std::io::Error; |
| //! |
| //! use signal_hook::iterator::Signals; |
| //! |
| //! fn main() -> Result<(), Error> { |
| //! let signals = Signals::new(&[ |
| //! signal_hook::SIGHUP, |
| //! signal_hook::SIGTERM, |
| //! signal_hook::SIGINT, |
| //! signal_hook::SIGQUIT, |
| //! # signal_hook::SIGUSR1, |
| //! ])?; |
| //! # // A trick to terminate the example when run as doc-test. Not part of the real code. |
| //! # unsafe { libc::raise(signal_hook::SIGUSR1) }; |
| //! 'outer: loop { |
| //! // Pick up signals that arrived since last time |
| //! for signal in signals.pending() { |
| //! match signal as libc::c_int { |
| //! signal_hook::SIGHUP => { |
| //! // Reload configuration |
| //! // Reopen the log file |
| //! } |
| //! signal_hook::SIGTERM | signal_hook::SIGINT | signal_hook::SIGQUIT => { |
| //! break 'outer; |
| //! }, |
| //! # signal_hook::SIGUSR1 => return Ok(()), |
| //! _ => unreachable!(), |
| //! } |
| //! } |
| //! // Do some bit of work ‒ something with upper limit on waiting, so we don't block |
| //! // forever with a SIGTERM already waiting. |
| //! } |
| //! println!("Terminating. Bye bye"); |
| //! Ok(()) |
| //! } |
| //! ``` |
| |
| </span><span class="kw">use </span>std::borrow::Borrow; |
| <span class="kw">use </span>std::io::Error; |
| <span class="kw">use </span>std::iter::Enumerate; |
| <span class="kw">use </span>std::os::unix::io::AsRawFd; |
| <span class="kw">use </span>std::os::unix::net::UnixStream; |
| <span class="kw">use </span>std::slice::Iter; |
| <span class="kw">use </span>std::sync::atomic::{AtomicBool, Ordering}; |
| <span class="kw">use </span>std::sync::{Arc, Mutex}; |
| |
| <span class="kw">use </span>libc::{<span class="self">self</span>, c_int}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::SigId; |
| |
| <span class="doccomment">/// Maximal signal number we support. |
| </span><span class="kw">const </span>MAX_SIGNUM: usize = <span class="number">128</span>; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Waker { |
| pending: Vec<AtomicBool>, |
| closed: AtomicBool, |
| read: UnixStream, |
| write: UnixStream, |
| } |
| |
| <span class="kw">impl </span>Waker { |
| <span class="doccomment">/// Sends a wakeup signal to the internal wakeup pipe. |
| </span><span class="kw">fn </span>wake(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">unsafe </span>{ |
| <span class="comment">// See the comment at pipe::write. |
| // |
| // We don't use pipe::write, because it expects the FD to be already in non-blocking |
| // mode. That's because it needs to support actual pipes. We can afford send here, |
| // which has flags. |
| </span>libc::send( |
| <span class="self">self</span>.write.as_raw_fd(), |
| <span class="string">b"X" </span><span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span><span class="kw">_</span>, |
| <span class="number">1</span>, |
| libc::MSG_DONTWAIT, |
| ); |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>RegisteredSignals(Mutex<Vec<<span class="prelude-ty">Option</span><SigId>>>); |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>RegisteredSignals { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span>lock = <span class="self">self</span>.<span class="number">0</span>.lock().unwrap(); |
| <span class="kw">for </span>id <span class="kw">in </span>lock.iter().filter_map(|s| <span class="kw-2">*</span>s) { |
| <span class="kw">crate</span>::unregister(id); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// The main structure of the module, representing interest in some signals. |
| /// |
| /// Unlike the helpers in other modules, this registers the signals when created and unregisters |
| /// them on drop. It provides the pending signals during its lifetime, either in batches or as an |
| /// infinite iterator. |
| /// |
| /// # Multiple consumers |
| /// |
| /// You may have noticed this structure can be used simultaneously by multiple threads. If it is |
| /// done, a signal arrives to one of the threads (on the first come, first serve basis). The signal |
| /// is *not* broadcasted to all currently active threads. |
| /// |
| /// A similar thing applies to cloning the structure ‒ at least one of the copies gets the signal, |
| /// but it is not broadcasted to all of them. |
| /// |
| /// If you need multiple recipients, you can create multiple independent instances (not by cloning, |
| /// but by the constructor). |
| /// |
| /// # Examples |
| /// |
| /// ```rust |
| /// # extern crate signal_hook; |
| /// # |
| /// # use std::io::Error; |
| /// # use std::thread; |
| /// use signal_hook::iterator::Signals; |
| /// |
| /// # |
| /// # fn main() -> Result<(), Error> { |
| /// let signals = Signals::new(&[signal_hook::SIGUSR1, signal_hook::SIGUSR2])?; |
| /// thread::spawn(move || { |
| /// for signal in &signals { |
| /// match signal { |
| /// signal_hook::SIGUSR1 => {}, |
| /// signal_hook::SIGUSR2 => {}, |
| /// _ => unreachable!(), |
| /// } |
| /// } |
| /// }); |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| /// |
| /// # `mio` support |
| /// |
| /// If the crate is compiled with the `mio-support` or `mio-0_7-support` flags, the `Signals` |
| /// becomes pluggable into `mio` version `0.6` or `0.7` respectively (it implements the `Source` |
| /// trait). If it becomes readable, there may be new signals to pick up. |
| /// |
| /// # `tokio` support |
| /// |
| /// If the crate is compiled with the `tokio-support` flag, the [`into_async`](#method.into_async) |
| /// method becomes available. This method turns the iterator into an asynchronous stream of |
| /// received signals. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>Signals { |
| ids: Arc<RegisteredSignals>, |
| waker: Arc<Waker>, |
| } |
| |
| <span class="kw">impl </span>Signals { |
| <span class="doccomment">/// Creates the `Signals` structure. |
| /// |
| /// This registers all the signals listed. The same restrictions (panics, errors) apply as with |
| /// [`register`](../fn.register.html). |
| </span><span class="kw">pub fn </span>new<I, S>(signals: I) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> |
| <span class="kw">where |
| </span>I: IntoIterator<Item = S>, |
| S: Borrow<c_int>, |
| { |
| <span class="kw">let </span>(read, write) = UnixStream::pair()<span class="question-mark">?</span>; |
| <span class="kw">let </span>pending = (<span class="number">0</span>..MAX_SIGNUM).map(|<span class="kw">_</span>| AtomicBool::new(<span class="bool-val">false</span>)).collect(); |
| <span class="kw">let </span>waker = Arc::new(Waker { |
| pending, |
| closed: AtomicBool::new(<span class="bool-val">false</span>), |
| read, |
| write, |
| }); |
| <span class="kw">let </span>ids = (<span class="number">0</span>..MAX_SIGNUM).map(|<span class="kw">_</span>| <span class="prelude-val">None</span>).collect(); |
| <span class="kw">let </span>me = <span class="self">Self </span>{ |
| ids: Arc::new(RegisteredSignals(Mutex::new(ids))), |
| waker, |
| }; |
| <span class="kw">for </span>sig <span class="kw">in </span>signals { |
| me.add_signal(<span class="kw-2">*</span>sig.borrow())<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(me) |
| } |
| |
| <span class="doccomment">/// Registers another signal to the set watched by this [`Signals`] instance. |
| /// |
| /// # Notes |
| /// |
| /// * This is safe to call concurrently from whatever thread. |
| /// * This is *not* safe to call from within a signal handler. |
| /// * If the signal number was already registered previously, this is a no-op. |
| /// * If this errors, the original set of signals is left intact. |
| /// * This actually registers the signal into the whole group of [`Signals`] cloned from each |
| /// other, so any of them might start receiving the signals. |
| /// |
| /// # Panics |
| /// |
| /// * If the given signal is [forbidden][crate::FORBIDDEN]. |
| /// * If the signal number is negative or larger than internal limit. The limit should be |
| /// larger than any supported signal the OS supports. |
| </span><span class="kw">pub fn </span>add_signal(<span class="kw-2">&</span><span class="self">self</span>, signal: c_int) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="macro">assert!</span>(signal >= <span class="number">0</span>); |
| <span class="macro">assert!</span>( |
| (signal <span class="kw">as </span>usize) < MAX_SIGNUM, |
| <span class="string">"Signal number {} too large. If your OS really supports such signal, file a bug"</span>, |
| signal, |
| ); |
| <span class="kw">let </span><span class="kw-2">mut </span>lock = <span class="self">self</span>.ids.<span class="number">0</span>.lock().unwrap(); |
| <span class="comment">// Already registered, ignoring |
| </span><span class="kw">if </span>lock[signal <span class="kw">as </span>usize].is_some() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| |
| <span class="kw">let </span>waker = Arc::clone(<span class="kw-2">&</span><span class="self">self</span>.waker); |
| <span class="kw">let </span>action = <span class="kw">move </span>|| { |
| waker.pending[signal <span class="kw">as </span>usize].store(<span class="bool-val">true</span>, Ordering::SeqCst); |
| waker.wake(); |
| }; |
| <span class="kw">let </span>id = <span class="kw">unsafe </span>{ <span class="kw">crate</span>::register(signal, action) }<span class="question-mark">?</span>; |
| lock[signal <span class="kw">as </span>usize] = <span class="prelude-val">Some</span>(id); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Reads data from the internal self-pipe. |
| /// |
| /// If `wait` is `true` and there are no data in the self pipe, it blocks until some come. |
| /// |
| /// Returns weather it successfully read something. |
| </span><span class="kw">fn </span>flush(<span class="kw-2">&</span><span class="self">self</span>, wait: bool) -> bool { |
| <span class="comment">// Just an optimisation.. would work without it too. |
| </span><span class="kw">if </span><span class="self">self</span>.waker.closed.load(Ordering::SeqCst) { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">const </span>SIZE: usize = <span class="number">1024</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>buff = [<span class="number">0u8</span>; SIZE]; |
| <span class="kw">let </span>res = <span class="kw">unsafe </span>{ |
| <span class="comment">// We ignore all errors on purpose. This should not be something like closed file |
| // descriptor. It could EAGAIN, but that's OK in case we say MSG_DONTWAIT. If it's |
| // EINTR, then it's OK too, it'll only create a spurious wakeup. |
| </span>libc::recv( |
| <span class="self">self</span>.waker.read.as_raw_fd(), |
| buff.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>libc::c_void, |
| SIZE, |
| <span class="kw">if </span>wait { <span class="number">0 </span>} <span class="kw">else </span>{ libc::MSG_DONTWAIT }, |
| ) |
| }; |
| |
| <span class="kw">if </span>res > <span class="number">0 </span>{ |
| <span class="kw">unsafe </span>{ |
| <span class="comment">// Finish draining the data in case there's more |
| </span><span class="kw">while </span>libc::recv( |
| <span class="self">self</span>.waker.read.as_raw_fd(), |
| buff.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>libc::c_void, |
| SIZE, |
| libc::MSG_DONTWAIT, |
| ) > <span class="number">0 |
| </span>{} |
| } |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.waker.closed.load(Ordering::SeqCst) { |
| <span class="comment">// Wake any other sleeping ends |
| // (if none wait, it'll only leave garbage inside the pipe, but we'll close it soon |
| // anyway). |
| </span><span class="self">self</span>.waker.wake(); |
| } |
| res > <span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Returns an iterator of already received signals. |
| /// |
| /// This returns an iterator over all the signal numbers of the signals received since last |
| /// time they were read (out of the set registered by this `Signals` instance). Note that they |
| /// are returned in arbitrary order and a signal number is returned only once even if it was |
| /// received multiple times. |
| /// |
| /// This method returns immediately (does not block) and may produce an empty iterator if there |
| /// are no signals ready. |
| </span><span class="kw">pub fn </span>pending(<span class="kw-2">&</span><span class="self">self</span>) -> Pending { |
| <span class="self">self</span>.flush(<span class="bool-val">false</span>); |
| |
| Pending(<span class="self">self</span>.waker.pending.iter().enumerate()) |
| } |
| |
| <span class="doccomment">/// Waits for some signals to be available and returns an iterator. |
| /// |
| /// This is similar to [`pending`](#method.pending). If there are no signals available, it |
| /// tries to wait for some to arrive. However, due to implementation details, this still can |
| /// produce an empty iterator. |
| /// |
| /// This can block for arbitrary long time. |
| /// |
| /// Note that the blocking is done in this method, not in the iterator. |
| </span><span class="kw">pub fn </span>wait(<span class="kw-2">&</span><span class="self">self</span>) -> Pending { |
| <span class="self">self</span>.flush(<span class="bool-val">true</span>); |
| |
| Pending(<span class="self">self</span>.waker.pending.iter().enumerate()) |
| } |
| |
| <span class="doccomment">/// Returns an infinite iterator over arriving signals. |
| /// |
| /// The iterator's `next()` blocks as necessary to wait for signals to arrive. This is adequate |
| /// if you want to designate a thread solely to handling signals. If multiple signals come at |
| /// the same time (between two values produced by the iterator), they will be returned in |
| /// arbitrary order. Multiple instances of the same signal may be collated. |
| /// |
| /// This is also the iterator returned by `IntoIterator` implementation on `&Signals`. |
| /// |
| /// This iterator terminates only if the [`Signals`] is explicitly [closed][Signals::close]. |
| /// |
| /// # Examples |
| /// |
| /// ```rust |
| /// # extern crate libc; |
| /// # extern crate signal_hook; |
| /// # |
| /// # use std::io::Error; |
| /// # use std::thread; |
| /// # |
| /// use signal_hook::iterator::Signals; |
| /// |
| /// # fn main() -> Result<(), Error> { |
| /// let signals = Signals::new(&[signal_hook::SIGUSR1, signal_hook::SIGUSR2])?; |
| /// thread::spawn(move || { |
| /// for signal in signals.forever() { |
| /// match signal { |
| /// signal_hook::SIGUSR1 => {}, |
| /// signal_hook::SIGUSR2 => {}, |
| /// _ => unreachable!(), |
| /// } |
| /// } |
| /// }); |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>forever(<span class="kw-2">&</span><span class="self">self</span>) -> Forever { |
| Forever { |
| signals: <span class="self">self</span>, |
| iter: <span class="self">self</span>.pending(), |
| } |
| } |
| |
| <span class="doccomment">/// Is it closed? |
| /// |
| /// See [`close`][Signals::close]. |
| </span><span class="kw">pub fn </span>is_closed(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.waker.closed.load(Ordering::SeqCst) |
| } |
| |
| <span class="doccomment">/// Closes the instance. |
| /// |
| /// This is meant to signalize termination through all the interrelated instances ‒ the ones |
| /// created by cloning the same original [`Signals`] instance (and all the [`Async`] ones |
| /// created from them). After calling close: |
| /// |
| /// * [`is_closed`][Signals::is_closed] will return true. |
| /// * All currently blocking operations on all threads and all the instances are interrupted |
| /// and terminate. |
| /// * Any further operations will never block. |
| /// * Further signals may or may not be returned from the iterators. However, if any are |
| /// returned, these are real signals that happened. |
| /// * The [`forever`][Signals::forever] terminates (follows from the above). |
| /// |
| /// The goal is to be able to shut down any background thread that handles only the signals. |
| /// |
| /// ```rust |
| /// # use signal_hook::iterator::Signals; |
| /// # use signal_hook::SIGUSR1; |
| /// # fn main() -> Result<(), std::io::Error> { |
| /// let signals = Signals::new(&[SIGUSR1])?; |
| /// let signals_bg = signals.clone(); |
| /// let thread = std::thread::spawn(move || { |
| /// for signal in &signals_bg { |
| /// // Whatever with the signal |
| /// # let _ = signal; |
| /// } |
| /// }); |
| /// |
| /// signals.close(); |
| /// |
| /// // The thread will terminate on its own now (the for cycle runs out of signals). |
| /// thread.join().expect("background thread panicked"); |
| /// # Ok(()) } |
| /// ``` |
| </span><span class="kw">pub fn </span>close(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="self">self</span>.waker.closed.store(<span class="bool-val">true</span>, Ordering::SeqCst); |
| <span class="self">self</span>.waker.wake(); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Signals { |
| <span class="kw">type </span>Item = c_int; |
| <span class="kw">type </span>IntoIter = Forever<<span class="lifetime">'a</span>>; |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> Forever<<span class="lifetime">'a</span>> { |
| <span class="self">self</span>.forever() |
| } |
| } |
| |
| <span class="doccomment">/// The iterator of one batch of signals. |
| /// |
| /// This is returned by the [`pending`](struct.Signals.html#method.pending) and |
| /// [`wait`](struct.Signals.html#method.wait) methods. |
| </span><span class="kw">pub struct </span>Pending<<span class="lifetime">'a</span>>(Enumerate<Iter<<span class="lifetime">'a</span>, AtomicBool>>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>Pending<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = c_int; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><c_int> { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((sig, flag)) = <span class="self">self</span>.<span class="number">0</span>.next() { |
| <span class="kw">if </span>flag |
| .compare_exchange(<span class="bool-val">true</span>, <span class="bool-val">false</span>, Ordering::SeqCst, Ordering::Relaxed) |
| .is_ok() |
| { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(sig <span class="kw">as </span>c_int); |
| } |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// The infinite iterator of signals. |
| /// |
| /// It is returned by the [`forever`](struct.Signals.html#method.forever) and by the `IntoIterator` |
| /// implementation of [`&Signals`](struct.Signals.html). |
| </span><span class="kw">pub struct </span>Forever<<span class="lifetime">'a</span>> { |
| signals: <span class="kw-2">&</span><span class="lifetime">'a </span>Signals, |
| iter: Pending<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>Forever<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = c_int; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><c_int> { |
| <span class="kw">while </span>!<span class="self">self</span>.signals.is_closed() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(result) = <span class="self">self</span>.iter.next() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(result); |
| } |
| |
| <span class="self">self</span>.iter = <span class="self">self</span>.signals.wait(); |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| } |
| <span class="attribute">#[cfg(feature = <span class="string">"mio-support"</span>)] |
| </span><span class="kw">mod </span>mio_support { |
| <span class="kw">use </span>std::io::Error; |
| <span class="kw">use </span>std::os::unix::io::AsRawFd; |
| |
| <span class="kw">use </span>mio::event::Evented; |
| <span class="kw">use </span>mio::unix::EventedFd; |
| <span class="kw">use </span>mio::{Poll, PollOpt, Ready, Token}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::Signals; |
| |
| <span class="kw">impl </span>Evented <span class="kw">for </span>Signals { |
| <span class="kw">fn </span>register( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| poll: <span class="kw-2">&</span>Poll, |
| token: Token, |
| interest: Ready, |
| opts: PollOpt, |
| ) -> <span class="prelude-ty">Result</span><(), Error> { |
| EventedFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).register(poll, token, interest, opts) |
| } |
| |
| <span class="kw">fn </span>reregister( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| poll: <span class="kw-2">&</span>Poll, |
| token: Token, |
| interest: Ready, |
| opts: PollOpt, |
| ) -> <span class="prelude-ty">Result</span><(), Error> { |
| EventedFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).reregister(poll, token, interest, opts) |
| } |
| |
| <span class="kw">fn </span>deregister(<span class="kw-2">&</span><span class="self">self</span>, poll: <span class="kw-2">&</span>Poll) -> <span class="prelude-ty">Result</span><(), Error> { |
| EventedFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).deregister(poll) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="kw">use </span>libc; |
| <span class="kw">use </span>mio::Events; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>mio_wakeup() { |
| <span class="kw">let </span>signals = Signals::new(<span class="kw-2">&</span>[<span class="kw">crate</span>::SIGUSR1]).unwrap(); |
| <span class="kw">let </span>token = Token(<span class="number">0</span>); |
| <span class="kw">let </span>poll = Poll::new().unwrap(); |
| poll.register(<span class="kw-2">&</span>signals, token, Ready::readable(), PollOpt::level()) |
| .unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>events = Events::with_capacity(<span class="number">10</span>); |
| <span class="kw">unsafe </span>{ libc::raise(<span class="kw">crate</span>::SIGUSR1) }; |
| poll.poll(<span class="kw-2">&mut </span>events, <span class="prelude-val">Some</span>(Duration::from_secs(<span class="number">10</span>))) |
| .unwrap(); |
| <span class="kw">let </span>event = events.iter().next().unwrap(); |
| <span class="macro">assert!</span>(event.readiness().is_readable()); |
| <span class="macro">assert_eq!</span>(token, event.token()); |
| <span class="kw">let </span>sig = signals.pending().next().unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="kw">crate</span>::SIGUSR1, sig); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(test, feature = <span class="string">"mio-0_7-support"</span>))] |
| </span><span class="kw">mod </span>mio_0_7_support { |
| <span class="kw">use </span>std::io::Error; |
| <span class="kw">use </span>std::os::unix::io::AsRawFd; |
| |
| <span class="kw">use </span>mio_0_7::event::Source; |
| <span class="kw">use </span>mio_0_7::unix::SourceFd; |
| <span class="kw">use </span>mio_0_7::{Interest, Registry, Token}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::Signals; |
| |
| <span class="kw">impl </span>Source <span class="kw">for </span>Signals { |
| <span class="kw">fn </span>register( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interest: Interest, |
| ) -> <span class="prelude-ty">Result</span><(), Error> { |
| SourceFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).register(registry, token, interest) |
| } |
| |
| <span class="kw">fn </span>reregister( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interest: Interest, |
| ) -> <span class="prelude-ty">Result</span><(), Error> { |
| SourceFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).reregister(registry, token, interest) |
| } |
| |
| <span class="kw">fn </span>deregister(<span class="kw-2">&mut </span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> <span class="prelude-ty">Result</span><(), Error> { |
| SourceFd(<span class="kw-2">&</span><span class="self">self</span>.waker.read.as_raw_fd()).deregister(registry) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="kw">use </span>mio_0_7::{Events, Poll}; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>mio_wakeup() { |
| <span class="kw">let </span><span class="kw-2">mut </span>signals = Signals::new(<span class="kw-2">&</span>[<span class="kw">crate</span>::SIGUSR1]).unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>poll = Poll::new().unwrap(); |
| <span class="kw">let </span>token = Token(<span class="number">0</span>); |
| poll.registry() |
| .register(<span class="kw-2">&mut </span>signals, token, Interest::READABLE) |
| .unwrap(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>events = Events::with_capacity(<span class="number">10</span>); |
| <span class="kw">unsafe </span>{ libc::raise(<span class="kw">crate</span>::SIGUSR1) }; |
| poll.poll(<span class="kw-2">&mut </span>events, <span class="prelude-val">Some</span>(Duration::from_secs(<span class="number">10</span>))) |
| .unwrap(); |
| <span class="kw">let </span>event = events.iter().next().unwrap(); |
| |
| <span class="macro">assert!</span>(event.is_readable()); |
| <span class="macro">assert_eq!</span>(token, event.token()); |
| <span class="kw">let </span>sig = signals.pending().next().unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="kw">crate</span>::SIGUSR1, sig); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"tokio-support"</span>)] |
| </span><span class="kw">mod </span>tokio_support { |
| <span class="kw">use </span>std::io::Error; |
| <span class="kw">use </span>std::sync::atomic::Ordering; |
| |
| <span class="kw">use </span>futures::stream::Stream; |
| <span class="kw">use </span>futures::{Async <span class="kw">as </span>AsyncResult, Poll}; |
| <span class="kw">use </span>libc::{<span class="self">self</span>, c_int}; |
| <span class="kw">use </span>tokio_reactor::{Handle, Registration}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::Signals; |
| |
| <span class="doccomment">/// An asynchronous stream of registered signals. |
| /// |
| /// It is created by converting [`Signals`](struct.Signals.html). See |
| /// [`Signals::into_async`](struct.Signals.html#method.into_async). |
| /// |
| /// # Cloning |
| /// |
| /// If you register multiple signals, then create multiple `Signals` instances by cloning and |
| /// convert them to `Async`, one of them can „steal“ wakeups for several signals at once. This |
| /// one will produce the signals while the others will be silent. |
| /// |
| /// This has an effect if the one consumes them slowly or is dropped after the first one. |
| /// |
| /// It is recommended not to clone the `Signals` instances and keep just one `Async` stream |
| /// around. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Async { |
| registration: Registration, |
| inner: Signals, |
| <span class="comment">// It seems we can't easily use the iterator into the array here because of lifetimes ‒ |
| // using non-'static things in around futures is real pain. |
| </span>position: usize, |
| } |
| |
| <span class="kw">impl </span>Async { |
| <span class="doccomment">/// Creates a new `Async`. |
| </span><span class="kw">pub fn </span>new(signals: Signals, handle: <span class="kw-2">&</span>Handle) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> { |
| <span class="kw">let </span>registration = Registration::new(); |
| registration.register_with(<span class="kw-2">&</span>signals, handle)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(Async { |
| registration, |
| inner: signals, |
| position: <span class="number">0</span>, |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Stream <span class="kw">for </span>Async { |
| <span class="kw">type </span>Item = libc::c_int; |
| <span class="kw">type </span>Error = Error; |
| <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>) -> Poll<<span class="prelude-ty">Option</span><libc::c_int>, <span class="self">Self</span>::Error> { |
| <span class="kw">while </span>!<span class="self">self</span>.inner.is_closed() { |
| <span class="kw">if </span><span class="self">self</span>.position >= <span class="self">self</span>.inner.waker.pending.len() { |
| <span class="kw">if </span><span class="self">self</span>.registration.poll_read_ready()<span class="question-mark">?</span>.is_not_ready() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(AsyncResult::NotReady); |
| } |
| <span class="comment">// Non-blocking clean of the pipe |
| </span><span class="kw">while </span><span class="self">self</span>.inner.flush(<span class="bool-val">false</span>) {} |
| <span class="comment">// By now we have an indication there might be some stuff inside the signals, |
| // reset the scanning position |
| </span><span class="self">self</span>.position = <span class="number">0</span>; |
| } |
| <span class="macro">assert!</span>(<span class="self">self</span>.position < <span class="self">self</span>.inner.waker.pending.len()); |
| <span class="kw">let </span>sig = <span class="kw-2">&</span><span class="self">self</span>.inner.waker.pending[<span class="self">self</span>.position]; |
| <span class="kw">let </span>sig_num = <span class="self">self</span>.position; |
| <span class="self">self</span>.position += <span class="number">1</span>; |
| <span class="kw">if </span>sig |
| .compare_exchange(<span class="bool-val">true</span>, <span class="bool-val">false</span>, Ordering::SeqCst, Ordering::Relaxed) |
| .is_ok() |
| { |
| <span class="comment">// Successfully claimed a signal, return it |
| </span><span class="kw">return </span><span class="prelude-val">Ok</span>(AsyncResult::Ready(<span class="prelude-val">Some</span>(sig_num <span class="kw">as </span>c_int))); |
| } |
| } |
| <span class="prelude-val">Ok</span>(AsyncResult::Ready(<span class="prelude-val">None</span>)) |
| } |
| } |
| |
| <span class="kw">impl </span>Signals { |
| <span class="doccomment">/// Turns the iterator into an asynchronous stream. |
| /// |
| /// This allows getting the signals in asynchronous way in a tokio event loop. Available |
| /// only if compiled with the `tokio-support` feature enabled. |
| /// |
| /// # Examples |
| /// |
| /// ```rust |
| /// extern crate libc; |
| /// extern crate signal_hook; |
| /// extern crate tokio; |
| /// |
| /// use std::io::Error; |
| /// |
| /// use signal_hook::iterator::Signals; |
| /// use tokio::prelude::*; |
| /// |
| /// fn main() -> Result<(), Error> { |
| /// let wait_signal = Signals::new(&[signal_hook::SIGUSR1])? |
| /// .into_async()? |
| /// .into_future() |
| /// .map(|sig| assert_eq!(sig.0.unwrap(), signal_hook::SIGUSR1)) |
| /// .map_err(|e| panic!("{}", e.0)); |
| /// unsafe { libc::raise(signal_hook::SIGUSR1) }; |
| /// tokio::run(wait_signal); |
| /// Ok(()) |
| /// } |
| /// ``` |
| </span><span class="kw">pub fn </span>into_async(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><Async, Error> { |
| Async::new(<span class="self">self</span>, <span class="kw-2">&</span>Handle::default()) |
| } |
| |
| <span class="doccomment">/// Turns the iterator into a stream, tied into a specific tokio reactor. |
| </span><span class="kw">pub fn </span>into_async_with_handle(<span class="self">self</span>, handle: <span class="kw-2">&</span>Handle) -> <span class="prelude-ty">Result</span><Async, Error> { |
| Async::new(<span class="self">self</span>, handle) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"tokio-support"</span>)] |
| </span><span class="kw">pub use </span><span class="self">self</span>::tokio_support::Async; |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="signal_hook" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
