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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_sndreldata</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_sndreldata - initiate/respond to an orderly release with user data<xref type="10" name="sndreldata"></xref></blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="xti.h.html">xti.h</a>>int t_sndreldata( int fd, struct t_discon *discon)</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>discon-><td align=center>udata.maxlen<td align=center>/<tr valign=top><td align=left>discon-><td align=center>udata.len<td align=center>x<tr valign=top><td align=left>discon-><td align=center>udata.buf<td align=center>?(?)<tr valign=top><td align=left>discon-><td align=center>reason<td align=center>?<tr valign=top><td align=left>discon-><td align=center>sequence<td align=center>/</table></pre><p>This function is used to initiate an orderly release of the outgoingdirection of data transferand to senduser data with the release. The argument <I>fd</I>identifies the local transport endpoint where the connectionexists, and <I>discon</I>points to a <B>t_discon</B>structure containing the following members:<pre><code>struct netbuf udata;int reason;int sequence;</code></pre><p>After calling <i>t_sndreldata()</i>,the user may not send anymore data over the connection. However, a user maycontinue to receive data if an orderly releaseindication has not been received.<p>The field <I>reason</I>specifies the reason for thedisconnection through a protocol-dependent <I>reason code</I>,and <I>udata</I>identifies any user data that is sent with thedisconnection; the field <I>sequence</I>is not used.<p>The <I>udata</I>structure specifies the user data to be sentto the remote user. The amount of user data must notexceed the limits supported by the transport provider,as returned in the <I>discon</I>field of the <I>info</I>argument of<i><a href="t_open.html">t_open()</a></i>or <i><a href="t_getinfo.html">t_getinfo()</a></i>.If the <I>len</I>field of <I>udata</I>is zero or if the provider did not return T_ORDRELDATA in the <i><a href="t_open.html">t_open()</a></i>flags, no data will be sent to the remote user.<p>If a user does not wish to send data and reason code tothe remote user, the value of <I>discon</I>may be a null pointer.<p>This function is an optional service of the transportprovider, only supported by providers of service typeT_COTS_ORD. The flag T_ORDRELDATA in the <I>info->flag</I>field returned by <i><a href="t_open.html">t_open()</a></i>or <i><a href="t_getinfo.html">t_getinfo()</a></i>indicates that the providersupports orderly release user data; when the flag is not set,this function behaves as <i><a href="t_rcvrel.html">t_rcvrel()</a></i>and no user data is returned.<p>This function may not be available on all systems.</blockquote><h4>VALID STATES</h4><blockquote>T_DATAXFER, T_INREL<br></blockquote><h4>ERRORS</h4><blockquote>On failure, <I>t_errno</I>is set to one of the following:<dl compact><dt>[TBADDATA]<dd>The amount of user data specified wasnot within the bounds allowed by thetransport provider, or user data wassupplied and the provider did notreturn T_ORDRELDATA in the <i><a href="t_open.html">t_open()</a></i>flags.<dt>[TBADF]<dd>The specified file descriptor does not refer to a transport endpoint.<dt>[TFLOW]<dd>O_NONBLOCK was set, but the flowcontrol mechanism prevented thetransport provider from accepting thefunction at this time.<dt>[TLOOK]<dd>An asynchronous event has occurred on thistransport endpoint and requires immediateattention.<dt>[TNOTSUPPORT]<dd>Orderly release is not supported by theunderlying transport provider.<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 acommunication problem has been detectedbetween XTI and the transport providerfor which there is no other suitableXTI error<I>(t_errno)</I>.<dt>[TSYSERR]<dd>A system error has occurred during executionof 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_getinfo.html">t_getinfo()</a></i>,<i><a href="t_open.html">t_open()</a></i>,<i><a href="t_rcvreldata.html">t_rcvreldata()</a></i>,<i><a href="t_rcvrel.html">t_rcvrel()</a></i>,<i><a href="t_sndrel.html">t_sndrel()</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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