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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>t_rcvuderr</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>NAME</h4><blockquote>t_rcvuderr - receive a unit data error indication</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="xti.h.html">xti.h</a>>int t_rcvuderr( int fd, struct t_uderr *uderr)</code></pre></blockquote><h4>DESCRIPTION</h4><blockquote><pre><P><table bordercolor=#000000 border=1 align=center><tr valign=top><th align=center><b>Parameters</b><th align=center><b>Before call</b><th align=center><b>After call</b><tr valign=top><td align=left>fd<td align=center>x<td align=center>/<tr valign=top><td align=left>uderr-><td align=center>addr.maxlen<td align=center>x<tr valign=top><td align=left>uderr-><td align=center>addr.len<td align=center>/<tr valign=top><td align=left>uderr-><td align=center>addr.buf<td align=center>?<tr valign=top><td align=left>uderr-><td align=center>opt.maxlen<td align=center>x<tr valign=top><td align=left>uderr-><td align=center>opt.len<td align=center>/<tr valign=top><td align=left>uderr-><td align=center>opt.buf<td align=center>?<tr valign=top><td align=left>uderr-><td align=center>error<td align=center>/</table></pre><p>This function is used in connectionless-modeto receive information concerning an erroron a previously sent data unit, andshould only be issued following a unit data error indication.It informs the transport user that a data unit with a specificdestination address and protocol options produced an error.The argument<I>fd</I>identifies the local transport endpoint through which the errorreport will be received, and<I>uderr</I>points to a<B>t_uderr</B>structure containing the following members:<pre><code>struct netbuf addr;struct netbuf opt;t_scalar_t error;</code></pre><p>The<I>maxlen</I>field of<I>addr</I>and<I>opt</I>must be set before calling this function to indicate the maximumsize of the buffer for each.If this fieldis set to zero for <I>addr</I>or <I>opt</I>,no information is returned in the <I>buf</I>field of this parameter.<p>On return from this call, the<I>addr</I>structure specifies the destination protocol address of the erroneous dataunit, the<I>opt</I>structure identifies options that wereassociated with the data unit, and<I>error</I>specifies a protocol-dependent error code.<p>If the user does not care to identify the data unitthat produced an error,<I>uderr</I>may be set to a null pointer, and<i>t_rcvuderr()</i>will simply clear the error indication without reporting anyinformation to the user.</blockquote><h4>VALID STATES</h4><blockquote>T_IDLE</blockquote><h4>ERRORS</h4><blockquote>On failure,<I>t_errno</I>is set to one of the following:<dl compact><dt>[TBADF]<dd>The specified file descriptor does not refer to a transport endpoint.<dt>[TBUFOVFLW]<dd>The number of bytes allocated for the incoming protocol address oroptions<I>(maxlen)</I>is greater than 0 but notsufficient to store the information.The unit data error information to be returned in<I>uderr</I>will be discarded.<dt>[TNOTSUPPORT]<dd>This function is not supported by the underlying transportprovider.<dt>[TNOUDERR]<dd>No unit data error indication currently exists on the specifiedtransport endpoint.<dt>[TOUTSTATE]<dd>The communications endpoint referenced by<I>fd</I>is not in one of the states in which a call to this function is valid.<dt>[TPROTO]<dd>This error indicates that a communication problem has been detected betweenXTI and the transport provider for which there is no other suitable XTIerror<I>(t_errno)</I>.<dt>[TSYSERR]<dd>A system error has occurred during execution of this function.</dl></blockquote><h4>RETURN VALUE</h4><blockquote>Upon successful completion, a value of 0 is returned. Otherwise,a value of -1 is returned and<I>t_errno</I>is set to indicate an error.</blockquote><h4>SEE ALSO</h4><blockquote><i><a href="t_rcvudata.html">t_rcvudata()</a></i>,<i><a href="t_sndudata.html">t_sndudata()</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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