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<h1 id="firstHeading" class="firstHeading">errno</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-error.html">error</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cerrno.html">&lt;cerrno&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="co2">#define errno /*implementation-defined*/</span></span></div>
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<p><code>errno</code> &#26159;&#29992;&#20110;&#38169;&#35823;&#25351;&#31034;&#30340;&#39044;&#22788;&#29702;&#22120;&#23439;&#12290;&#23427;&#23637;&#24320;&#25104;&#19968;&#20010;<span class="t-rev-inl t-until-cxx11"><span>&#38745;&#24577;</span> <span><span class="t-mark-rev t-until-cxx11">(C++11 &#21069;)</span></span></span><span class="t-rev-inl t-since-cxx11"><span>&#32447;&#31243;&#23616;&#22495;</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></span></span>&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span></span></span> &#31867;&#22411;&#21487;&#20462;&#25913;&#24038;&#20540;&#12290;</p>
<p>&#25968;&#20010;&#26631;&#20934;&#24211;&#20989;&#25968;&#36890;&#36807;&#20889;&#20837;&#27491;&#25972;&#25968;&#21040; <code>errno</code> &#25351;&#31034;&#38169;&#35823;&#12290; <code>errno</code> &#30340;&#20540;&#34987;&#20856;&#22411;&#22320;&#35774;&#32622;&#20026;&#20316;&#20026;&#21015;&#20110; <code>&lt;cerrno&gt;</code> &#30340;&#65292;&#20197;&#23383;&#27597; <code>E</code> &#36215;&#22987;&#65292;&#21518;&#38543;&#22823;&#20889;&#23383;&#27597;&#25110;&#25968;&#23383;&#30340;&#23439;&#24120;&#37327;&#12290;</p>
<p>&#31243;&#24207;&#21551;&#21160;&#26102; <code>errno</code> &#30340;&#20540;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#32780;&#19988;&#23613;&#31649;&#19981;&#31649;&#22312;&#38169;&#35823;&#21457;&#29983;&#19982;&#21542;&#26102;&#65292;&#20801;&#35768;&#20889;&#20837;&#27491;&#25972;&#25968;&#21040; <code>errno</code> &#65292;&#24211;&#20989;&#25968;&#20915;&#19981;&#20250;&#23384;&#20648; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#20110; <code>errno</code> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cmath&gt;</span>
<span class="co2">#include &lt;cerrno&gt;</span>
<span class="co2">#include &lt;cstring&gt;</span>
<span class="co2">#include &lt;clocale&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">double</span> not_a_number <span class="sy1">=</span> <a href="cpp-numeric-math-log.html"><span class="kw1323">std::<span class="me2">log</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">1.0</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="kw2">errno</span> <span class="sy1">==</span> <a href="cpp-error-errno_macros.html"><span class="kw809">EDOM</span></a><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;log(-1) failed: &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-string-byte-strerror.html"><span class="kw1160">std::<span class="me2">strerror</span></span></a><span class="br0">(</span><span class="kw2">errno</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-locale-setlocale.html"><span class="kw1989">std::<span class="me2">setlocale</span></span></a><span class="br0">(</span>LC_MESSAGES, <span class="st0">&quot;de_DE.utf8&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Or, in German, &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-string-byte-strerror.html"><span class="kw1160">std::<span class="me2">strerror</span></span></a><span class="br0">(</span><span class="kw2">errno</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">log(-1) failed: Numerical argument out of domain
Or, in German, Das numerische Argument ist ausserhalb des Definitionsbereiches</pre></div>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
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<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue310">LWG 310</a></td>
<td>C++98</td>
<td>&#26410;&#25351;&#26126; errno &#26159;&#23439;&#36824;&#26159;&#26377;&#22806;&#37096;&#38142;&#25509;&#30340;&#26631;&#35782;&#31526;</td>
<td>errno &#24517;&#39035;&#26159;&#23439;</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-error-errno_macros.html"><span class="t-lines"><span>E2BIG, EACCES, ..., EXDEV</span></span></a></div>
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<td>&#20860;&#23481;&#26631;&#20934; POSIX &#30340;&#38169;&#35823;&#26465;&#20214;&#30340;&#23439;<br />
<span class="t-mark">(&#23439;&#24120;&#37327;)</span></td>
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<div><a href="cpp-io-c-perror.html"><span class="t-lines"><span>perror</span></span></a></div>
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<td>&#26174;&#31034;&#23545;&#24212;&#24403;&#21069;&#38169;&#35823;&#30340;&#23383;&#31526;&#20018;&#20110; <span class="t-lc"><a href="cpp-io-c.html">stderr</a></span><br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-string-byte-strerror.html"><span class="t-lines"><span>strerror</span></span></a></div>
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<td>&#36820;&#22238;&#32473;&#23450;&#38169;&#35823;&#30721;&#30340;&#25991;&#26412;&#29256;&#26412;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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