| <!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 `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.8.1/src/sys/aio.rs`."> |
| <meta name="keywords" content="rust, rustlang, rust-lang"> |
| |
| <title>aio.rs.html -- source</title> |
| |
| <link rel="stylesheet" type="text/css" href="../../../normalize.css"> |
| <link rel="stylesheet" type="text/css" href="../../../rustdoc.css"> |
| <link rel="stylesheet" type="text/css" href="../../../main.css"> |
| |
| |
| |
| |
| </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"> |
| |
| |
| </nav> |
| |
| <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"> |
| </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> |
| </pre><pre class="rust "> |
| <span class="kw">use</span> {<span class="ident">Error</span>, <span class="ident">Errno</span>, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">RawFd</span>; |
| <span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_void</span>, <span class="ident">off_t</span>, <span class="ident">size_t</span>}; |
| <span class="kw">use</span> <span class="ident">libc</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Debug</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">stderr</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>::{<span class="ident">null</span>, <span class="ident">null_mut</span>}; |
| <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">signal</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">time</span>::<span class="ident">TimeSpec</span>; |
| |
| <span class="doccomment">/// Mode for `AioCb::fsync`. Controls whether only data or both data and</span> |
| <span class="doccomment">/// metadata are synced.</span> |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">i32</span>)]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">AioFsyncMode</span> { |
| <span class="doccomment">/// do it like `fsync`</span> |
| <span class="ident">O_SYNC</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_SYNC</span>, |
| <span class="doccomment">/// on supported operating systems only, do it like `fdatasync`</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>))]</span> |
| <span class="ident">O_DSYNC</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">O_DSYNC</span> |
| } |
| |
| <span class="doccomment">/// When used with `lio_listio`, determines whether a given `aiocb` should be</span> |
| <span class="doccomment">/// used for a read operation, a write operation, or ignored. Has no effect for</span> |
| <span class="doccomment">/// any other aio functions.</span> |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">i32</span>)]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LioOpcode</span> { |
| <span class="ident">LIO_NOP</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">LIO_NOP</span>, |
| <span class="ident">LIO_WRITE</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">LIO_WRITE</span>, |
| <span class="ident">LIO_READ</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">LIO_READ</span> |
| } |
| |
| <span class="doccomment">/// Mode for `lio_listio`.</span> |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">i32</span>)]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LioMode</span> { |
| <span class="doccomment">/// Requests that `lio_listio` block until all requested operations have</span> |
| <span class="doccomment">/// been completed</span> |
| <span class="ident">LIO_WAIT</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">LIO_WAIT</span>, |
| <span class="doccomment">/// Requests that `lio_listio` return immediately</span> |
| <span class="ident">LIO_NOWAIT</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">LIO_NOWAIT</span>, |
| } |
| |
| <span class="doccomment">/// Return values for `AioCb::cancel and aio_cancel_all`</span> |
| <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">i32</span>)]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">AioCancelStat</span> { |
| <span class="doccomment">/// All outstanding requests were canceled</span> |
| <span class="ident">AioCanceled</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">AIO_CANCELED</span>, |
| <span class="doccomment">/// Some requests were not canceled. Their status should be checked with</span> |
| <span class="doccomment">/// `AioCb::error`</span> |
| <span class="ident">AioNotCanceled</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">AIO_NOTCANCELED</span>, |
| <span class="doccomment">/// All of the requests have already finished</span> |
| <span class="ident">AioAllDone</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">AIO_ALLDONE</span>, |
| } |
| |
| <span class="doccomment">/// The basic structure used by all aio functions. Each `aiocb` represents one</span> |
| <span class="doccomment">/// I/O request.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AioCb</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="ident">aiocb</span>: <span class="ident">libc</span>::<span class="ident">aiocb</span>, |
| <span class="doccomment">/// Tracks whether the buffer pointed to by aiocb.aio_buf is mutable</span> |
| <span class="ident">mutable</span>: <span class="ident">bool</span>, |
| <span class="doccomment">/// Could this `AioCb` potentially have any in-kernel state?</span> |
| <span class="ident">in_progress</span>: <span class="ident">bool</span>, |
| <span class="ident">phantom</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">></span> |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">AioCb</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="doccomment">/// Constructs a new `AioCb` with no associated buffer.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The resulting `AioCb` structure is suitable for use with `AioCb::fsync`.</span> |
| <span class="doccomment">/// * `fd` File descriptor. Required for all aio functions.</span> |
| <span class="doccomment">/// * `prio` If POSIX Prioritized IO is supported, then the operation will</span> |
| <span class="doccomment">/// be prioritized at the process's priority level minus `prio`</span> |
| <span class="doccomment">/// * `sigev_notify` Determines how you will be notified of event</span> |
| <span class="doccomment">/// completion.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_fd</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">prio</span>: ::<span class="ident">c_int</span>, |
| <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>) <span class="op">-></span> <span class="ident">AioCb</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">AioCb</span>::<span class="ident">common_init</span>(<span class="ident">fd</span>, <span class="ident">prio</span>, <span class="ident">sigev_notify</span>); |
| <span class="ident">a</span>.<span class="ident">aio_offset</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="ident">a</span>.<span class="ident">aio_nbytes</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="ident">a</span>.<span class="ident">aio_buf</span> <span class="op">=</span> <span class="ident">null_mut</span>(); |
| |
| <span class="kw">let</span> <span class="ident">aiocb</span> <span class="op">=</span> <span class="ident">AioCb</span> { <span class="ident">aiocb</span>: <span class="ident">a</span>, <span class="ident">mutable</span>: <span class="bool-val">false</span>, <span class="ident">in_progress</span>: <span class="bool-val">false</span>, |
| <span class="ident">phantom</span>: <span class="ident">PhantomData</span>}; |
| <span class="ident">aiocb</span> |
| } |
| |
| <span class="doccomment">/// Constructs a new `AioCb`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// * `fd` File descriptor. Required for all aio functions.</span> |
| <span class="doccomment">/// * `offs` File offset</span> |
| <span class="doccomment">/// * `buf` A memory buffer</span> |
| <span class="doccomment">/// * `prio` If POSIX Prioritized IO is supported, then the operation will</span> |
| <span class="doccomment">/// be prioritized at the process's priority level minus `prio`</span> |
| <span class="doccomment">/// * `sigev_notify` Determines how you will be notified of event</span> |
| <span class="doccomment">/// completion.</span> |
| <span class="doccomment">/// * `opcode` This field is only used for `lio_listio`. It determines</span> |
| <span class="doccomment">/// which operation to use for this individual aiocb</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_mut_slice</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">offs</span>: <span class="ident">off_t</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>], |
| <span class="ident">prio</span>: ::<span class="ident">c_int</span>, <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>, |
| <span class="ident">opcode</span>: <span class="ident">LioOpcode</span>) <span class="op">-></span> <span class="ident">AioCb</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">AioCb</span>::<span class="ident">common_init</span>(<span class="ident">fd</span>, <span class="ident">prio</span>, <span class="ident">sigev_notify</span>); |
| <span class="ident">a</span>.<span class="ident">aio_offset</span> <span class="op">=</span> <span class="ident">offs</span>; |
| <span class="ident">a</span>.<span class="ident">aio_nbytes</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>; |
| <span class="comment">// casting an immutable buffer to a mutable pointer looks unsafe, but</span> |
| <span class="comment">// technically its only unsafe to dereference it, not to create it.</span> |
| <span class="ident">a</span>.<span class="ident">aio_buf</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_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">a</span>.<span class="ident">aio_lio_opcode</span> <span class="op">=</span> <span class="ident">opcode</span> <span class="kw">as</span> ::<span class="ident">c_int</span>; |
| |
| <span class="kw">let</span> <span class="ident">aiocb</span> <span class="op">=</span> <span class="ident">AioCb</span> { <span class="ident">aiocb</span>: <span class="ident">a</span>, <span class="ident">mutable</span>: <span class="bool-val">true</span>, <span class="ident">in_progress</span>: <span class="bool-val">false</span>, |
| <span class="ident">phantom</span>: <span class="ident">PhantomData</span>}; |
| <span class="ident">aiocb</span> |
| } |
| |
| <span class="doccomment">/// Like `from_mut_slice`, but works on constant slices rather than</span> |
| <span class="doccomment">/// mutable slices.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// An `AioCb` created this way cannot be used with `read`, and its</span> |
| <span class="doccomment">/// `LioOpcode` cannot be set to `LIO_READ`. This method is useful when</span> |
| <span class="doccomment">/// writing a const buffer with `AioCb::write`, since from_mut_slice can't</span> |
| <span class="doccomment">/// work with const buffers.</span> |
| <span class="comment">// Note: another solution to the problem of writing const buffers would be</span> |
| <span class="comment">// to genericize AioCb for both &mut [u8] and &[u8] buffers. AioCb::read</span> |
| <span class="comment">// could take the former and AioCb::write could take the latter. However,</span> |
| <span class="comment">// then lio_listio wouldn't work, because that function needs a slice of</span> |
| <span class="comment">// AioCb, and they must all be the same type. We're basically stuck with</span> |
| <span class="comment">// using an unsafe function, since aio (as designed in C) is an unsafe API.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">offs</span>: <span class="ident">off_t</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>], |
| <span class="ident">prio</span>: ::<span class="ident">c_int</span>, <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>, |
| <span class="ident">opcode</span>: <span class="ident">LioOpcode</span>) <span class="op">-></span> <span class="ident">AioCb</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">AioCb</span>::<span class="ident">common_init</span>(<span class="ident">fd</span>, <span class="ident">prio</span>, <span class="ident">sigev_notify</span>); |
| <span class="ident">a</span>.<span class="ident">aio_offset</span> <span class="op">=</span> <span class="ident">offs</span>; |
| <span class="ident">a</span>.<span class="ident">aio_nbytes</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>; |
| <span class="ident">a</span>.<span class="ident">aio_buf</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_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="macro">assert</span><span class="macro">!</span>(<span class="ident">opcode</span> <span class="op">!=</span> <span class="ident">LioOpcode</span>::<span class="ident">LIO_READ</span>, <span class="string">"Can't read into an immutable buffer"</span>); |
| <span class="ident">a</span>.<span class="ident">aio_lio_opcode</span> <span class="op">=</span> <span class="ident">opcode</span> <span class="kw">as</span> ::<span class="ident">c_int</span>; |
| |
| <span class="kw">let</span> <span class="ident">aiocb</span> <span class="op">=</span> <span class="ident">AioCb</span> { <span class="ident">aiocb</span>: <span class="ident">a</span>, <span class="ident">mutable</span>: <span class="bool-val">false</span>, <span class="ident">in_progress</span>: <span class="bool-val">false</span>, |
| <span class="ident">phantom</span>: <span class="ident">PhantomData</span>}; |
| <span class="ident">aiocb</span> |
| } |
| |
| <span class="kw">fn</span> <span class="ident">common_init</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>, <span class="ident">prio</span>: ::<span class="ident">c_int</span>, |
| <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">aiocb</span> { |
| <span class="comment">// Use mem::zeroed instead of explicitly zeroing each field, because the</span> |
| <span class="comment">// number and name of reserved fields is OS-dependent. On some OSes,</span> |
| <span class="comment">// some reserved fields are used the kernel for state, and must be</span> |
| <span class="comment">// explicitly zeroed when allocated.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">zeroed</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">aiocb</span><span class="op">></span>()}; |
| <span class="ident">a</span>.<span class="ident">aio_fildes</span> <span class="op">=</span> <span class="ident">fd</span>; |
| <span class="ident">a</span>.<span class="ident">aio_reqprio</span> <span class="op">=</span> <span class="ident">prio</span>; |
| <span class="ident">a</span>.<span class="ident">aio_sigevent</span> <span class="op">=</span> <span class="ident">SigEvent</span>::<span class="ident">new</span>(<span class="ident">sigev_notify</span>).<span class="ident">sigevent</span>(); |
| <span class="ident">a</span> |
| } |
| |
| <span class="doccomment">/// Update the notification settings for an existing `aiocb`</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_sigev_notify</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>) { |
| <span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_sigevent</span> <span class="op">=</span> <span class="ident">SigEvent</span>::<span class="ident">new</span>(<span class="ident">sigev_notify</span>).<span class="ident">sigevent</span>(); |
| } |
| |
| <span class="doccomment">/// Cancels an outstanding AIO request.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cancel</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">AioCancelStat</span><span class="op">></span> { |
| <span class="kw">match</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_cancel</span>(<span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_fildes</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span>) } { |
| <span class="ident">libc</span>::<span class="ident">AIO_CANCELED</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioCanceled</span>), |
| <span class="ident">libc</span>::<span class="ident">AIO_NOTCANCELED</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioNotCanceled</span>), |
| <span class="ident">libc</span>::<span class="ident">AIO_ALLDONE</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioAllDone</span>), |
| <span class="op">-</span><span class="number">1</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">last</span>()), |
| _ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"unknown aio_cancel return value"</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Retrieve error status of an asynchronous operation. If the request has</span> |
| <span class="doccomment">/// not yet completed, returns `EINPROGRESS`. Otherwise, returns `Ok` or</span> |
| <span class="doccomment">/// any other error.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">match</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_error</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span>) } { |
| <span class="number">0</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(()), |
| <span class="ident">num</span> <span class="kw">if</span> <span class="ident">num</span> <span class="op">></span> <span class="number">0</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">from_errno</span>(<span class="ident">Errno</span>::<span class="ident">from_i32</span>(<span class="ident">num</span>))), |
| <span class="op">-</span><span class="number">1</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">last</span>()), |
| <span class="ident">num</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"unknown aio_error return value {:?}"</span>, <span class="ident">num</span>) |
| } |
| } |
| |
| <span class="doccomment">/// An asynchronous version of `fsync`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fsync</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">mode</span>: <span class="ident">AioFsyncMode</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span>; |
| <span class="self">self</span>.<span class="ident">in_progress</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_fsync</span>(<span class="ident">mode</span> <span class="kw">as</span> ::<span class="ident">c_int</span>, <span class="ident">p</span>) }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Asynchronously reads from a file descriptor into a buffer</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">mutable</span>, <span class="string">"Can't read into an immutable buffer"</span>); |
| <span class="kw">let</span> <span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span>; |
| <span class="self">self</span>.<span class="ident">in_progress</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_read</span>(<span class="ident">p</span>) }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="doccomment">/// Retrieve return status of an asynchronous operation. Should only be</span> |
| <span class="doccomment">/// called once for each `AioCb`, after `AioCb::error` indicates that it has</span> |
| <span class="doccomment">/// completed. The result is the same as for `read`, `write`, of `fsync`.</span> |
| <span class="comment">// Note: this should be just `return`, but that's a reserved word</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">aio_return</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">isize</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span>; |
| <span class="self">self</span>.<span class="ident">in_progress</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_return</span>(<span class="ident">p</span>) }) |
| } |
| |
| <span class="doccomment">/// Asynchronously writes from a buffer to a file descriptor</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">aiocb</span>; |
| <span class="self">self</span>.<span class="ident">in_progress</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_write</span>(<span class="ident">p</span>) }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| } |
| |
| <span class="doccomment">/// Cancels outstanding AIO requests. All requests for `fd` will be cancelled.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">aio_cancel_all</span>(<span class="ident">fd</span>: <span class="ident">RawFd</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">AioCancelStat</span><span class="op">></span> { |
| <span class="kw">match</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">aio_cancel</span>(<span class="ident">fd</span>, <span class="ident">null_mut</span>()) } { |
| <span class="ident">libc</span>::<span class="ident">AIO_CANCELED</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioCanceled</span>), |
| <span class="ident">libc</span>::<span class="ident">AIO_NOTCANCELED</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioNotCanceled</span>), |
| <span class="ident">libc</span>::<span class="ident">AIO_ALLDONE</span> <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">AioCancelStat</span>::<span class="ident">AioAllDone</span>), |
| <span class="op">-</span><span class="number">1</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">last</span>()), |
| _ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"unknown aio_cancel return value"</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Suspends the calling process until at least one of the specified `AioCb`s</span> |
| <span class="doccomment">/// has completed, a signal is delivered, or the timeout has passed. If</span> |
| <span class="doccomment">/// `timeout` is `None`, `aio_suspend` will block indefinitely.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">aio_suspend</span>(<span class="ident">list</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">AioCb</span>], <span class="ident">timeout</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">TimeSpec</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="comment">// We must use transmute because Rust doesn't understand that a pointer to a</span> |
| <span class="comment">// Struct is the same as a pointer to its first element.</span> |
| <span class="kw">let</span> <span class="ident">plist</span> <span class="op">=</span> <span class="kw">unsafe</span> { |
| <span class="ident">mem</span>::<span class="ident">transmute</span>::<span class="op"><</span><span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">AioCb</span>], <span class="kw-2">*</span><span class="kw">const</span> [<span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">aiocb</span>]<span class="op">></span>(<span class="ident">list</span>) |
| }; |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">plist</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">aiocb</span>; |
| <span class="kw">let</span> <span class="ident">timep</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">timeout</span> { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">null</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">timespec</span><span class="op">></span>(), |
| <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>.<span class="ident">as_ref</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">timespec</span> |
| }; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">aio_suspend</span>(<span class="ident">p</span>, <span class="ident">list</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">i32</span>, <span class="ident">timep</span>) |
| }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| |
| <span class="doccomment">/// Submits multiple asynchronous I/O requests with a single system call. The</span> |
| <span class="doccomment">/// order in which the requests are carried out is not specified.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>)))]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lio_listio</span>(<span class="ident">mode</span>: <span class="ident">LioMode</span>, <span class="ident">list</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">AioCb</span>], |
| <span class="ident">sigev_notify</span>: <span class="ident">SigevNotify</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { |
| <span class="kw">let</span> <span class="ident">sigev</span> <span class="op">=</span> <span class="ident">SigEvent</span>::<span class="ident">new</span>(<span class="ident">sigev_notify</span>); |
| <span class="kw">let</span> <span class="ident">sigevp</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">sigev</span>.<span class="ident">sigevent</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">sigevent</span>; |
| <span class="comment">// We must use transmute because Rust doesn't understand that a pointer to a</span> |
| <span class="comment">// Struct is the same as a pointer to its first element.</span> |
| <span class="kw">let</span> <span class="ident">plist</span> <span class="op">=</span> <span class="kw">unsafe</span> { |
| <span class="ident">mem</span>::<span class="ident">transmute</span>::<span class="op"><</span><span class="kw-2">&</span>[<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">AioCb</span>], <span class="kw-2">*</span><span class="kw">const</span> [<span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span>]<span class="op">></span>(<span class="ident">list</span>) |
| }; |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">plist</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">aiocb</span>; |
| <span class="ident">Errno</span>::<span class="ident">result</span>(<span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">lio_listio</span>(<span class="ident">mode</span> <span class="kw">as</span> <span class="ident">i32</span>, <span class="ident">p</span>, <span class="ident">list</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">i32</span>, <span class="ident">sigevp</span>) |
| }).<span class="ident">map</span>(<span class="ident">drop</span>) |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">AioCb</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="ident">fmt</span>.<span class="ident">debug_struct</span>(<span class="string">"AioCb"</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_fildes"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_fildes</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_offset"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_offset</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_buf"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_buf</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_nbytes"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_nbytes</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_lio_opcode"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_lio_opcode</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_reqprio"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_reqprio</span>) |
| .<span class="ident">field</span>(<span class="string">"aio_sigevent"</span>, <span class="kw-2">&</span><span class="ident">SigEvent</span>::<span class="ident">from</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">aiocb</span>.<span class="ident">aio_sigevent</span>)) |
| .<span class="ident">field</span>(<span class="string">"mutable"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">mutable</span>) |
| .<span class="ident">field</span>(<span class="string">"in_progress"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">in_progress</span>) |
| .<span class="ident">field</span>(<span class="string">"phantom"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">phantom</span>) |
| .<span class="ident">finish</span>() |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">AioCb</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { |
| <span class="doccomment">/// If the `AioCb` has no remaining state in the kernel, just drop it.</span> |
| <span class="doccomment">/// Otherwise, collect its error and return values, so as not to leak</span> |
| <span class="doccomment">/// resources.</span> |
| <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">in_progress</span> { |
| <span class="comment">// Well-written programs should never get here. They should always</span> |
| <span class="comment">// wait for an AioCb to complete before dropping it</span> |
| <span class="kw">let</span> _ <span class="op">=</span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">stderr</span>(), <span class="string">"WARNING: dropped an in-progress AioCb"</span>); |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">aio_suspend</span>(<span class="kw-2">&</span>[<span class="kw-2">&</span><span class="self">self</span>], <span class="prelude-val">None</span>); |
| <span class="kw">match</span> <span class="ident">ret</span> { |
| <span class="prelude-val">Ok</span>(()) <span class="op">=></span> <span class="kw">break</span>, |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINVAL</span>)) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>( |
| <span class="string">"Inconsistent AioCb.in_progress value"</span>), |
| <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">Sys</span>(<span class="ident">Errno</span>::<span class="ident">EINTR</span>)) <span class="op">=></span> (), <span class="comment">// Retry interrupted syscall</span> |
| _ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Unexpected aio_suspend return value {:?}"</span>, <span class="ident">ret</span>) |
| }; |
| } |
| <span class="kw">let</span> _ <span class="op">=</span> <span class="self">self</span>.<span class="ident">aio_return</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>?</dt> |
| <dd>Show this help dialog</dd> |
| <dt>S</dt> |
| <dd>Focus the search field</dd> |
| <dt>⇤</dt> |
| <dd>Move up in search results</dd> |
| <dt>⇥</dt> |
| <dd>Move down in search results</dd> |
| <dt>⏎</dt> |
| <dd>Go to active search result</dd> |
| <dt>+</dt> |
| <dd>Collapse/expand 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> |
| </div> |
| </div> |
| </aside> |
| |
| |
| |
| <script> |
| window.rootPath = "../../../"; |
| window.currentCrate = "nix"; |
| </script> |
| <script src="../../../main.js"></script> |
| <script defer src="../../../search-index.js"></script> |
| </body> |
| </html> |
