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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>strerror</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_084"> </a>NAME</h4><blockquote>strerror - get error message string</blockquote><h4><a name = "tag_000_009_085"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="string.h.html">string.h</a>>char *strerror(int <i>errnum</i>);</code></pre></blockquote><h4><a name = "tag_000_009_086"> </a>DESCRIPTION</h4><blockquote>The<i>strerror()</i>function maps the error number in<i>errnum</i>to a locale-dependent error message string and returns a pointerthereto.The stringpointed to must not be modified by the program, but may beoverwritten by a subsequent call to<i>strerror()</i>or<i><a href="perror.html">perror()</a></i>.<p>The contents of the error message strings returned by<i>strerror()</i>should be determined by the setting of the LC_MESSAGES category in thecurrent locale.<p>The implementation will behave as if no function defined in thisspecification calls<i>strerror()</i>.<p>The<i>strerror()</i>function will not change the setting of <b>errno</b>if successful.<p>Because no return value is reserved to indicate an error, an applicationwishing to check for error situations should set<i>errno</i>to 0, then call<i>strerror()</i>,then check<i>errno</i>.<p>This interface need not be reentrant.</blockquote><h4><a name = "tag_000_009_087"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>strerror()</i>returns a pointer to the generated message string.On error<i>errno</i>may be set, but no return value is reserved to indicate an error.</blockquote><h4><a name = "tag_000_009_088"> </a>ERRORS</h4><blockquote>The<i>strerror()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The value of<i>errnum</i>is not a valid error number.</dl></blockquote><h4><a name = "tag_000_009_089"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_090"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_091"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_092"> </a>SEE ALSO</h4><blockquote><i><a href="perror.html">perror()</a></i>,<i><a href="string.h.html"><string.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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