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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>perror</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_007_964"> </a>NAME</h4><blockquote>perror - write error messages to standard error</blockquote><h4><a name = "tag_000_007_965"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>void perror(const char *<i>s</i>);</code></pre></blockquote><h4><a name = "tag_000_007_966"> </a>DESCRIPTION</h4><blockquote>The<i>perror()</i>function maps the error number accessed through the symbol<i>errno</i>to a language-dependent error message, which is written to thestandard error stream as follows: first (if<i>s</i>is not a null pointer and the character pointed to by<i>s</i>is not the null byte), the string pointed to by<i>s</i>followed by a colon and a space character;then an error message string followedby a newline character. The contents of the error message stringsare the same as those returned by<i><a href="strerror.html">strerror()</a></i>with argument<i>errno</i>.<p>The<i>perror()</i>function will mark the file associated with the standarderror stream as having been written(<i>st_ctime</i>,<i>st_mtime</i>marked for update) at some time between its successful completion and<i><a href="exit.html">exit()</a></i>,<i><a href="abort.html">abort()</a></i>,or the completion of<i><a href="fflush.html">fflush()</a></i>or<i><a href="fclose.html">fclose()</a></i>on<i>stderr</i>.<p>The<i>perror()</i>function does not change the orientation of the standard error stream.</blockquote><h4><a name = "tag_000_007_967"> </a>RETURN VALUE</h4><blockquote>The<i>perror()</i>function returns no value.</blockquote><h4><a name = "tag_000_007_968"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_007_969"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_970"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_971"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_972"> </a>SEE ALSO</h4><blockquote><i><a href="strerror.html">strerror()</a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</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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