<!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 to the Rust file `libstd/sys/unix/net.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>net.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../light.css" id="themeStyle"><script src="../../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../../settings.html"><img src="../../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="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> </pre><pre class="rust "> <span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="kw">use</span> <span class="ident">ffi</span>::<span class="ident">CStr</span>; <span class="kw">use</span> <span class="ident">io</span>; <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">c_int</span>, <span class="ident">c_void</span>, <span class="ident">size_t</span>, <span class="ident">sockaddr</span>, <span class="ident">socklen_t</span>, <span class="ident">EAI_SYSTEM</span>, <span class="ident">MSG_PEEK</span>}; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">net</span>::{<span class="ident">SocketAddr</span>, <span class="ident">Shutdown</span>}; <span class="kw">use</span> <span class="ident">str</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">fd</span>::<span class="ident">FileDesc</span>; <span class="kw">use</span> <span class="ident">sys_common</span>::{<span class="ident">AsInner</span>, <span class="ident">FromInner</span>, <span class="ident">IntoInner</span>}; <span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">net</span>::{<span class="ident">getsockopt</span>, <span class="ident">setsockopt</span>, <span class="ident">sockaddr_to_addr</span>}; <span class="kw">use</span> <span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>}; <span class="kw">use</span> <span class="ident">cmp</span>; <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sys</span>::{<span class="ident">cvt</span>, <span class="ident">cvt_r</span>}; <span class="kw">pub</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">libc</span> <span class="kw">as</span> <span class="ident">netc</span>; <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">wrlen_t</span> <span class="op">=</span> <span class="ident">size_t</span>; <span class="comment">// See below for the usage of SOCK_CLOEXEC, but this constant is only defined on</span> <span class="comment">// Linux currently (e.g. support doesn't exist on other platforms). In order to</span> <span class="comment">// get name resolution to work and things to compile we just define a dummy</span> <span class="comment">// SOCK_CLOEXEC here for other platforms. Note that the dummy constant isn't</span> <span class="comment">// actually ever used (the blocks below are wrapped in `if cfg!` as well.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>)]</span> <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">SOCK_CLOEXEC</span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>))]</span> <span class="kw">const</span> <span class="ident">SOCK_CLOEXEC</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>; <span class="comment">// Another conditional contant for name resolution: Macos et iOS use</span> <span class="comment">// SO_NOSIGPIPE as a setsockopt flag to disable SIGPIPE emission on socket.</span> <span class="comment">// Other platforms do otherwise.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"apple"</span>)]</span> <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">SO_NOSIGPIPE</span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"apple"</span>))]</span> <span class="kw">const</span> <span class="ident">SO_NOSIGPIPE</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Socket</span>(<span class="ident">FileDesc</span>); <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() {} <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cvt_gai</span>(<span class="ident">err</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="kw">if</span> <span class="ident">err</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Ok</span>(()) } <span class="comment">// We may need to trigger a glibc workaround. See on_resolver_failure() for details.</span> <span class="ident">on_resolver_failure</span>(); <span class="kw">if</span> <span class="ident">err</span> <span class="op">==</span> <span class="ident">EAI_SYSTEM</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>()) } <span class="kw">let</span> <span class="ident">detail</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="ident">CStr</span>::<span class="ident">from_ptr</span>(<span class="ident">libc</span>::<span class="ident">gai_strerror</span>(<span class="ident">err</span>)).<span class="ident">to_bytes</span>()).<span class="ident">unwrap</span>() .<span class="ident">to_owned</span>() }; <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"failed to lookup address information: {}"</span>, <span class="ident">detail</span>)[..])) } <span class="kw">impl</span> <span class="ident">Socket</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">SocketAddr</span>, <span class="ident">ty</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Socket</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">fam</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">addr</span> { <span class="ident">SocketAddr</span>::<span class="ident">V4</span>(..) <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">AF_INET</span>, <span class="ident">SocketAddr</span>::<span class="ident">V6</span>(..) <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">AF_INET6</span>, }; <span class="ident">Socket</span>::<span class="ident">new_raw</span>(<span class="ident">fam</span>, <span class="ident">ty</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_raw</span>(<span class="ident">fam</span>: <span class="ident">c_int</span>, <span class="ident">ty</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Socket</span><span class="op">></span> { <span class="kw">unsafe</span> { <span class="comment">// On linux we first attempt to pass the SOCK_CLOEXEC flag to</span> <span class="comment">// atomically create the socket and set it as CLOEXEC. Support for</span> <span class="comment">// this option, however, was added in 2.6.27, and we still support</span> <span class="comment">// 2.6.18 as a kernel, so if the returned error is EINVAL we</span> <span class="comment">// fallthrough to the fallback.</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>) { <span class="kw">match</span> <span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">socket</span>(<span class="ident">fam</span>, <span class="ident">ty</span> <span class="op">|</span> <span class="ident">SOCK_CLOEXEC</span>, <span class="number">0</span>)) { <span class="prelude-val">Ok</span>(<span class="ident">fd</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Socket</span>(<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>))), <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">raw_os_error</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">EINVAL</span>) <span class="op">=></span> {} <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>), } } <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">socket</span>(<span class="ident">fam</span>, <span class="ident">ty</span>, <span class="number">0</span>))<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>); <span class="ident">fd</span>.<span class="ident">set_cloexec</span>()<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">socket</span> <span class="op">=</span> <span class="ident">Socket</span>(<span class="ident">fd</span>); <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"apple"</span>) { <span class="ident">setsockopt</span>(<span class="kw-2">&</span><span class="ident">socket</span>, <span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>, <span class="ident">SO_NOSIGPIPE</span>, <span class="number">1</span>)<span class="question-mark">?</span>; } <span class="prelude-val">Ok</span>(<span class="ident">socket</span>) } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_pair</span>(<span class="ident">fam</span>: <span class="ident">c_int</span>, <span class="ident">ty</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">Socket</span>, <span class="ident">Socket</span>)<span class="op">></span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>]; <span class="comment">// Like above, see if we can set cloexec atomically</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>) { <span class="kw">match</span> <span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">socketpair</span>(<span class="ident">fam</span>, <span class="ident">ty</span> <span class="op">|</span> <span class="ident">SOCK_CLOEXEC</span>, <span class="number">0</span>, <span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>())) { <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=></span> { <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">Socket</span>(<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fds</span>[<span class="number">0</span>])), <span class="ident">Socket</span>(<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fds</span>[<span class="number">1</span>])))); } <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">raw_os_error</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">EINVAL</span>) <span class="op">=></span> {}, <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>), } } <span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">socketpair</span>(<span class="ident">fam</span>, <span class="ident">ty</span>, <span class="number">0</span>, <span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>()))<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fds</span>[<span class="number">0</span>]); <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fds</span>[<span class="number">1</span>]); <span class="ident">a</span>.<span class="ident">set_cloexec</span>()<span class="question-mark">?</span>; <span class="ident">b</span>.<span class="ident">set_cloexec</span>()<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>((<span class="ident">Socket</span>(<span class="ident">a</span>), <span class="ident">Socket</span>(<span class="ident">b</span>))) } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">connect_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">addr</span>: <span class="kw-2">&</span><span class="ident">SocketAddr</span>, <span class="ident">timeout</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="self">self</span>.<span class="ident">set_nonblocking</span>(<span class="bool-val">true</span>)<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw">let</span> (<span class="ident">addrp</span>, <span class="ident">len</span>) <span class="op">=</span> <span class="ident">addr</span>.<span class="ident">into_inner</span>(); <span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">connect</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">addrp</span>, <span class="ident">len</span>)) }; <span class="self">self</span>.<span class="ident">set_nonblocking</span>(<span class="bool-val">false</span>)<span class="question-mark">?</span>; <span class="kw">match</span> <span class="ident">r</span> { <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(()), <span class="comment">// there's no ErrorKind for EINPROGRESS :(</span> <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">raw_os_error</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">EINPROGRESS</span>) <span class="op">=></span> {} <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>), } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pollfd</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pollfd</span> { <span class="ident">fd</span>: <span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">events</span>: <span class="ident">libc</span>::<span class="ident">POLLOUT</span>, <span class="ident">revents</span>: <span class="number">0</span>, }; <span class="kw">if</span> <span class="ident">timeout</span>.<span class="ident">as_secs</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">timeout</span>.<span class="ident">subsec_nanos</span>() <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>, <span class="string">"cannot set a 0 duration timeout"</span>)); } <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>(); <span class="kw">loop</span> { <span class="kw">let</span> <span class="ident">elapsed</span> <span class="op">=</span> <span class="ident">start</span>.<span class="ident">elapsed</span>(); <span class="kw">if</span> <span class="ident">elapsed</span> <span class="op">>=</span> <span class="ident">timeout</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">TimedOut</span>, <span class="string">"connection timed out"</span>)); } <span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">timeout</span> <span class="op">-</span> <span class="ident">elapsed</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">timeout</span>.<span class="ident">as_secs</span>() .<span class="ident">saturating_mul</span>(<span class="number">1_000</span>) .<span class="ident">saturating_add</span>(<span class="ident">timeout</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> <span class="ident">u64</span> <span class="op">/</span> <span class="number">1_000_000</span>); <span class="kw">if</span> <span class="ident">timeout</span> <span class="op">==</span> <span class="number">0</span> { <span class="ident">timeout</span> <span class="op">=</span> <span class="number">1</span>; } <span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">timeout</span>, <span class="ident">c_int</span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span>) <span class="kw">as</span> <span class="ident">c_int</span>; <span class="kw">match</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pollfd</span>, <span class="number">1</span>, <span class="ident">timeout</span>) } { <span class="op">-</span><span class="number">1</span> <span class="op">=></span> { <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>(); <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">kind</span>() <span class="op">!=</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>); } } <span class="number">0</span> <span class="op">=></span> {} <span class="kw">_</span> <span class="op">=></span> { <span class="comment">// linux returns POLLOUT|POLLERR|POLLHUP for refused connections (!), so look</span> <span class="comment">// for POLLHUP rather than read readiness</span> <span class="kw">if</span> <span class="ident">pollfd</span>.<span class="ident">revents</span> <span class="op">&</span> <span class="ident">libc</span>::<span class="ident">POLLHUP</span> <span class="op">!=</span> <span class="number">0</span> { <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">take_error</span>()<span class="question-mark">?</span> .<span class="ident">unwrap_or_else</span>(<span class="op">||</span> { <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"no error set after POLLHUP"</span>) }); <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); } <span class="kw">return</span> <span class="prelude-val">Ok</span>(()); } } } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">accept</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">storage</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">sockaddr</span>, <span class="ident">len</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">socklen_t</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Socket</span><span class="op">></span> { <span class="comment">// Unfortunately the only known way right now to accept a socket and</span> <span class="comment">// atomically set the CLOEXEC flag is to use the `accept4` syscall on</span> <span class="comment">// Linux. This was added in 2.6.28, however, and because we support</span> <span class="comment">// 2.6.18 we must detect this support dynamically.</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>) { <span class="macro">weak</span><span class="macro">!</span> { <span class="kw">fn</span> <span class="ident">accept4</span>(<span class="ident">c_int</span>, <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">sockaddr</span>, <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">socklen_t</span>, <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">c_int</span> } <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">accept</span>) <span class="op">=</span> <span class="ident">accept4</span>.<span class="ident">get</span>() { <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">cvt_r</span>(<span class="op">||</span> <span class="kw">unsafe</span> { <span class="ident">accept</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">storage</span>, <span class="ident">len</span>, <span class="ident">SOCK_CLOEXEC</span>) }); <span class="kw">match</span> <span class="ident">res</span> { <span class="prelude-val">Ok</span>(<span class="ident">fd</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Socket</span>(<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>))), <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">raw_os_error</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">libc</span>::<span class="ident">ENOSYS</span>) <span class="op">=></span> {} <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>), } } } <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">cvt_r</span>(<span class="op">||</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">accept</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">storage</span>, <span class="ident">len</span>) })<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>); <span class="ident">fd</span>.<span class="ident">set_cloexec</span>()<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(<span class="ident">Socket</span>(<span class="ident">fd</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">duplicate</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Socket</span><span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">duplicate</span>().<span class="ident">map</span>(<span class="ident">Socket</span>) } <span class="kw">fn</span> <span class="ident">recv_with_flags</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">flags</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">cvt</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">recv</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>(), <span class="ident">flags</span>) })<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(<span class="ident">ret</span> <span class="kw">as</span> <span class="ident">usize</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">recv_with_flags</span>(<span class="ident">buf</span>, <span class="number">0</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">peek</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">recv_with_flags</span>(<span class="ident">buf</span>, <span class="ident">MSG_PEEK</span>) } <span class="kw">fn</span> <span class="ident">recv_from_with_flags</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">flags</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">SocketAddr</span>)<span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">storage</span>: <span class="ident">libc</span>::<span class="ident">sockaddr_storage</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">zeroed</span>() }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">addrlen</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of_val</span>(<span class="kw-2">&</span><span class="ident">storage</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">socklen_t</span>; <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">cvt</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">recvfrom</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">buf</span>.<span class="ident">len</span>(), <span class="ident">flags</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">storage</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">addrlen</span>) })<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>((<span class="ident">n</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">sockaddr_to_addr</span>(<span class="kw-2">&</span><span class="ident">storage</span>, <span class="ident">addrlen</span> <span class="kw">as</span> <span class="ident">usize</span>)<span class="question-mark">?</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv_from</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">SocketAddr</span>)<span class="op">></span> { <span class="self">self</span>.<span class="ident">recv_from_with_flags</span>(<span class="ident">buf</span>, <span class="number">0</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">peek_from</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">SocketAddr</span>)<span class="op">></span> { <span class="self">self</span>.<span class="ident">recv_from_with_flags</span>(<span class="ident">buf</span>, <span class="ident">MSG_PEEK</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write</span>(<span class="ident">buf</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dur</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span>, <span class="ident">kind</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">dur</span> { <span class="prelude-val">Some</span>(<span class="ident">dur</span>) <span class="op">=></span> { <span class="kw">if</span> <span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>, <span class="string">"cannot set a 0 duration timeout"</span>)); } <span class="kw">let</span> <span class="ident">secs</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="op">></span> <span class="ident">libc</span>::<span class="ident">time_t</span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span> { <span class="ident">libc</span>::<span class="ident">time_t</span>::<span class="ident">max_value</span>() } <span class="kw">else</span> { <span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</span> }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">timeval</span> { <span class="ident">tv_sec</span>: <span class="ident">secs</span>, <span class="ident">tv_usec</span>: (<span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="op">/</span> <span class="number">1000</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">suseconds_t</span>, }; <span class="kw">if</span> <span class="ident">timeout</span>.<span class="ident">tv_sec</span> <span class="op">==</span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">timeout</span>.<span class="ident">tv_usec</span> <span class="op">==</span> <span class="number">0</span> { <span class="ident">timeout</span>.<span class="ident">tv_usec</span> <span class="op">=</span> <span class="number">1</span>; } <span class="ident">timeout</span> } <span class="prelude-val">None</span> <span class="op">=></span> { <span class="ident">libc</span>::<span class="ident">timeval</span> { <span class="ident">tv_sec</span>: <span class="number">0</span>, <span class="ident">tv_usec</span>: <span class="number">0</span>, } } }; <span class="ident">setsockopt</span>(<span class="self">self</span>, <span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>, <span class="ident">kind</span>, <span class="ident">timeout</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">kind</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">>></span> { <span class="kw">let</span> <span class="ident">raw</span>: <span class="ident">libc</span>::<span class="ident">timeval</span> <span class="op">=</span> <span class="ident">getsockopt</span>(<span class="self">self</span>, <span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>, <span class="ident">kind</span>)<span class="question-mark">?</span>; <span class="kw">if</span> <span class="ident">raw</span>.<span class="ident">tv_sec</span> <span class="op">==</span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">raw</span>.<span class="ident">tv_usec</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">sec</span> <span class="op">=</span> <span class="ident">raw</span>.<span class="ident">tv_sec</span> <span class="kw">as</span> <span class="ident">u64</span>; <span class="kw">let</span> <span class="ident">nsec</span> <span class="op">=</span> (<span class="ident">raw</span>.<span class="ident">tv_usec</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">*</span> <span class="number">1000</span>; <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">Duration</span>::<span class="ident">new</span>(<span class="ident">sec</span>, <span class="ident">nsec</span>))) } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shutdown</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">how</span>: <span class="ident">Shutdown</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="kw">let</span> <span class="ident">how</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">how</span> { <span class="ident">Shutdown</span>::<span class="ident">Write</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SHUT_WR</span>, <span class="ident">Shutdown</span>::<span class="ident">Read</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SHUT_RD</span>, <span class="ident">Shutdown</span>::<span class="ident">Both</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">SHUT_RDWR</span>, }; <span class="ident">cvt</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">shutdown</span>(<span class="self">self</span>.<span class="number">0</span>.<span class="ident">raw</span>(), <span class="ident">how</span>) })<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(()) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_nodelay</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nodelay</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="ident">setsockopt</span>(<span class="self">self</span>, <span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>, <span class="ident">libc</span>::<span class="ident">TCP_NODELAY</span>, <span class="ident">nodelay</span> <span class="kw">as</span> <span class="ident">c_int</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">nodelay</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">raw</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="ident">getsockopt</span>(<span class="self">self</span>, <span class="ident">libc</span>::<span class="ident">IPPROTO_TCP</span>, <span class="ident">libc</span>::<span class="ident">TCP_NODELAY</span>)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(<span class="ident">raw</span> <span class="op">!=</span> <span class="number">0</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_nonblocking</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nonblocking</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nonblocking</span> <span class="op">=</span> <span class="ident">nonblocking</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_int</span>; <span class="ident">cvt</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">ioctl</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">as_inner</span>(), <span class="ident">libc</span>::<span class="ident">FIONBIO</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">nonblocking</span>) }).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ()) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take_error</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">io</span>::<span class="ident">Error</span><span class="op">>></span> { <span class="kw">let</span> <span class="ident">raw</span>: <span class="ident">c_int</span> <span class="op">=</span> <span class="ident">getsockopt</span>(<span class="self">self</span>, <span class="ident">libc</span>::<span class="ident">SOL_SOCKET</span>, <span class="ident">libc</span>::<span class="ident">SO_ERROR</span>)<span class="question-mark">?</span>; <span class="kw">if</span> <span class="ident">raw</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">from_raw_os_error</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">i32</span>))) } } } <span class="kw">impl</span> <span class="ident">AsInner</span><span class="op"><</span><span class="ident">c_int</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Socket</span> { <span class="kw">fn</span> <span class="ident">as_inner</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">c_int</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">as_inner</span>() } } <span class="kw">impl</span> <span class="ident">FromInner</span><span class="op"><</span><span class="ident">c_int</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Socket</span> { <span class="kw">fn</span> <span class="ident">from_inner</span>(<span class="ident">fd</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">Socket</span> { <span class="ident">Socket</span>(<span class="ident">FileDesc</span>::<span class="ident">new</span>(<span class="ident">fd</span>)) } } <span class="kw">impl</span> <span class="ident">IntoInner</span><span class="op"><</span><span class="ident">c_int</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Socket</span> { <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">c_int</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">into_raw</span>() } } <span class="comment">// In versions of glibc prior to 2.26, there's a bug where the DNS resolver</span> <span class="comment">// will cache the contents of /etc/resolv.conf, so changes to that file on disk</span> <span class="comment">// can be ignored by a long-running program. That can break DNS lookups on e.g.</span> <span class="comment">// laptops where the network comes and goes. See</span> <span class="comment">// https://sourceware.org/bugzilla/show_bug.cgi?id=984. Note however that some</span> <span class="comment">// distros including Debian have patched glibc to fix this for a long time.</span> <span class="comment">//</span> <span class="comment">// A workaround for this bug is to call the res_init libc function, to clear</span> <span class="comment">// the cached configs. Unfortunately, while we believe glibc's implementation</span> <span class="comment">// of res_init is thread-safe, we know that other implementations are not</span> <span class="comment">// (https://github.com/rust-lang/rust/issues/43592). Code here in libstd could</span> <span class="comment">// try to synchronize its res_init calls with a Mutex, but that wouldn't</span> <span class="comment">// protect programs that call into libc in other ways. So instead of calling</span> <span class="comment">// res_init unconditionally, we call it only when we detect we're linking</span> <span class="comment">// against glibc version < 2.26. (That is, when we both know its needed and</span> <span class="comment">// believe it's thread-safe).</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"gnu"</span>)]</span> <span class="kw">fn</span> <span class="ident">on_resolver_failure</span>() { <span class="kw">use</span> <span class="ident">sys</span>; <span class="comment">// If the version fails to parse, we treat it the same as "not glibc".</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">version</span>) <span class="op">=</span> <span class="ident">sys</span>::<span class="ident">os</span>::<span class="ident">glibc_version</span>() { <span class="kw">if</span> <span class="ident">version</span> <span class="op"><</span> (<span class="number">2</span>, <span class="number">26</span>) { <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">res_init</span>() }; } } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"gnu"</span>))]</span> <span class="kw">fn</span> <span class="ident">on_resolver_failure</span>() {} <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">taget_env</span> <span class="op">=</span> <span class="string">"gnu"</span>))]</span> <span class="kw">mod</span> <span class="ident">test</span> { <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_res_init</span>() { <span class="comment">// This mostly just tests that the weak linkage doesn't panic wildly...</span> <span class="ident">res_init_if_glibc_before_2_26</span>().<span class="ident">unwrap</span>(); } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_parse_glibc_version</span>() { <span class="kw">let</span> <span class="ident">cases</span> <span class="op">=</span> [ (<span class="string">"0.0"</span>, <span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="number">0</span>))), (<span class="string">"01.+2"</span>, <span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="number">2</span>))), (<span class="string">"3.4.5.six"</span>, <span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="number">4</span>))), (<span class="string">"1"</span>, <span class="prelude-val">None</span>), (<span class="string">"1.-2"</span>, <span class="prelude-val">None</span>), (<span class="string">"1.foo"</span>, <span class="prelude-val">None</span>), (<span class="string">"foo.1"</span>, <span class="prelude-val">None</span>), ]; <span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">version_str</span>, <span class="ident">parsed</span>) <span class="kw">in</span> <span class="ident">cases</span>.<span class="ident">iter</span>() { <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>, <span class="ident">parse_glibc_version</span>(<span class="ident">version_str</span>)); } } } </pre> </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../../";window.currentCrate = "std";</script><script src="../../../../aliases.js"></script><script src="../../../../main.js"></script><script defer src="../../../../search-index.js"></script></body></html>