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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>getpeername</title></head><body bgcolor="white"><basefont size="3"> <a name="getpeername"></a> <a name="tag_03_235"></a><!-- getpeername --> <!--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_235_01"></a>NAME</h4><blockquote>getpeername - get the name of the peer socket</blockquote><h4><a name="tag_03_235_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/sys/socket.h.html">sys/socket.h</a>><br><br> int getpeername(int</tt> <i>socket</i><tt>, struct sockaddr *restrict</tt> <i>address</i><tt>,<br> socklen_t *restrict</tt> <i>address_len</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_235_03"></a>DESCRIPTION</h4><blockquote><p>The <i>getpeername</i>() function shall retrieve the peer address of the specified socket, store this address in the<b>sockaddr</b> structure pointed to by the <i>address</i> argument, and store the length of this address in the object pointed toby the <i>address_len</i> argument.</p><p>If the actual length of the address is greater than the length of the supplied <b>sockaddr</b> structure, the stored addressshall be truncated.</p><p>If the protocol permits connections by unbound clients, and the peer is not bound, then the value stored in the object pointedto by <i>address</i> is unspecified.</p></blockquote><h4><a name="tag_03_235_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p></blockquote><h4><a name="tag_03_235_05"></a>ERRORS</h4><blockquote><p>The <i>getpeername</i>() function shall fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>socket</i> argument is not a valid file descriptor.</dd><dt>[EINVAL]</dt><dd>The socket has been shut down.</dd><dt>[ENOTCONN]</dt><dd>The socket is not connected or otherwise has not had the peer pre-specified.</dd><dt>[ENOTSOCK]</dt><dd>The <i>socket</i> argument does not refer to a socket.</dd><dt>[EOPNOTSUPP]</dt><dd>The operation is not supported for the socket protocol.</dd></dl><p>The <i>getpeername</i>() function may fail if:</p><dl compact><dt>[ENOBUFS]</dt><dd>Insufficient resources were available in the system to complete the call.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_235_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_235_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_235_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_235_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_235_10"></a>SEE ALSO</h4><blockquote><p><a href="accept.html"><i>accept</i>()</a> , <a href="bind.html"><i>bind</i>()</a> , <a href="getsockname.html"><i>getsockname</i>()</a> , <a href="socket.html"><i>socket</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/sys/socket.h.html"><i><sys/socket.h></i></a></p></blockquote><h4><a name="tag_03_235_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from the XNS, Issue 5.2 specification.</p><p>The <b>restrict</b> keyword is added to the <i>getpeername</i>() prototype for alignment with the ISO/IEC 9899:1999standard.</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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