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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>h_errno</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="h_errno"></a> <a name="tag_03_263"></a><!-- h_errno --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_263_01"></a>NAME</h4><blockquote>h_errno - error return value for network database operations</blockquote><h4><a name="tag_03_263_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('OB')">OB</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <netdb.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div></blockquote><h4><a name="tag_03_263_03"></a>DESCRIPTION</h4><blockquote><p>This method of returning errors is used only in connection with obsolescent functions.</p><p>The <a href="../basedefs/netdb.h.html"><i><netdb.h></i></a> header provides a declaration of <i>h_errno</i> as amodifiable lvalue of type <b>int</b>.</p><p>It is unspecified whether <i>h_errno</i> is a macro or an identifier declared with external linkage. If a macro definition issuppressed in order to access an actual object, or a program defines an identifier with the name <i>h_errno</i>, the behavior isundefined.</p></blockquote><h4><a name="tag_03_263_04"></a>RETURN VALUE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_263_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_263_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_263_07"></a>APPLICATION USAGE</h4><blockquote><p>Applications should obtain the definition of <i>h_errno</i> by the inclusion of the <a href="../basedefs/netdb.h.html"><i><netdb.h></i></a> header.</p></blockquote><h4><a name="tag_03_263_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_263_09"></a>FUTURE DIRECTIONS</h4><blockquote><p><i>h_errno</i> may be withdrawn in a future version.</p></blockquote><h4><a name="tag_03_263_10"></a>SEE ALSO</h4><blockquote><p><a href="endhostent.html"><i>endhostent</i>()</a> , <a href="errno.html"><i>errno</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/netdb.h.html"><i><netdb.h></i></a></p></blockquote><h4><a name="tag_03_263_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from the XNS, Issue 5.2 specification.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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