160 lines
8.1 KiB
HTML
160 lines
8.1 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>错误号</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_error_errno_macros skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">错误号</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-error.html">error</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<p>每个定义于 <code><errno.h></code> 的宏都展开成 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span></span></span> 类型的整数常量表达式，并且拥有独立的正整数值。下列常量得到定义（实现可以定义更多，只要以 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">'E'</span></span></span> 开始，后随数字或大写字母）：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于头文件 <code><errno.h></code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>EDOM</span></span></div>
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</div>
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</td>
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<td>数学参数在定义域外<br />
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<span class="t-mark">(宏常量)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>EILSEQ</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div>
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</div>
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</td>
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<td>非法字节序列<br />
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<span class="t-mark">(宏常量)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>ERANGE</span></span></div>
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</div>
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</td>
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<td>结果过大<br />
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<span class="t-mark">(宏常量)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html">POSIX</a> 和 <a href="cpp-error-errno_macros.html">C++ 标准库</a>定义了更多的额外错误常量，而且每一个单独实现可能定义更多，例如 Linux 上的 <code>errno(3)</code> 或 BSD 和 OS X 上的 <code>intro(2)</code> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <stdio.h></span>
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<span class="co2">#include <math.h></span>
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<span class="co2">#include <errno.h></span>
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<span class="co2">#include <string.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw2">errno</span> <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw773">printf</span></a><span class="br0">(</span><span class="st0">"log(-1.0) = %f<span class="es1">\n</span>"</span>, <a href="c-numeric-math-log.html"><span class="kw582">log</span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">1.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw773">printf</span></a><span class="br0">(</span><span class="st0">"%s<span class="es1">\n</span><span class="es1">\n</span>"</span>,<a href="c-string-byte-strerror.html"><span class="kw496">strerror</span></a><span class="br0">(</span><span class="kw2">errno</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw2">errno</span> <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw773">printf</span></a><span class="br0">(</span><span class="st0">"log(0.0) = %f<span class="es1">\n</span>"</span>, <a href="c-numeric-math-log.html"><span class="kw582">log</span></a><span class="br0">(</span><span class="nu16">0.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw773">printf</span></a><span class="br0">(</span><span class="st0">"%s<span class="es1">\n</span>"</span>,<a href="c-string-byte-strerror.html"><span class="kw496">strerror</span></a><span class="br0">(</span><span class="kw2">errno</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">log(-1.0) = nan
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Numerical argument out of domain
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log(0.0) = -inf
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Numerical result out of range</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.5/2 Errors <errno.h> (p: 205)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c99">
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<ul>
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<li>C99 标准（ISO/IEC 9899:1999）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.5/2 Errors <errno.h> (p: 186)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c89">
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<ul>
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<li>C89/C90 标准（ISO/IEC 9899:1990）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>4.1.3 Errors <errno.h></li>
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</ul>
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</dd>
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</dl>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-error-errno.html"><span class="t-lines"><span>errno</span></span></a></div>
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</div>
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</td>
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<td>展开成 POSIX 兼容的线程局域错误编号变量<br />
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<span class="t-mark">(宏变量)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-io-perror.html"><span class="t-lines"><span>perror</span></span></a></div>
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</div>
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</td>
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<td>显示对应当前错误的字符串到 <span class="t-lc"><a href="c-io.html">stderr</a></span><br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-string-byte-strerror.html"><span class="t-lines"><span>strerror</span><span>strerror_s</span><span>strerrorlen_s</span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
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</div>
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</td>
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<td>返回给定错误码的文本版本<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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</div>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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