📄 t_snddis.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>t_snddis</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_snddis - send user-initiated disconnection request</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="xti.h.html">xti.h</a>>int t_snddis( int fd, const struct t_call *call)</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>call-><td align=center>addr.maxlen<td align=center>=<tr valign=top><td align=left>call-><td align=center>addr.len<td align=center>=<tr valign=top><td align=left>call-><td align=center>addr.buf<td align=center>=<tr valign=top><td align=left>call-><td align=center>opt.maxlen<td align=center>=<tr valign=top><td align=left>call-><td align=center>opt.len<td align=center>=<tr valign=top><td align=left>call-><td align=center>opt.buf<td align=center>=<tr valign=top><td align=left>call-><td align=center>udata.maxlen<td align=center>=<tr valign=top><td align=left>call-><td align=center>udata.len<td align=center>x<tr valign=top><td align=left>call-><td align=center>udata.buf<td align=center>?(?)<tr valign=top><td align=left>call-><td align=center>sequence<td align=center>?</table></pre><p>This function is used toinitiate an abortive release on an already established connection, orto reject a connection request.The argument<I>fd</I>identifies the local transport endpoint of the connection, and<I>call</I>specifies information associated with the abortive release.The argument<I>call</I>points to a<B>t_call</B>structure which contains the following members:<pre><code>struct netbuf addr;struct netbuf opt;struct netbuf udata;int sequence;</code></pre><p>The values in<I>call</I>have different semantics, depending on the context of the call to<i>t_snddis()</i>.When rejecting a connection request,<I>call</I>must be non-null and contain a valid value of<I>sequence</I>to uniquely identify the rejected connection indication to the transport provider.The<I>sequence</I>field is only meaningful if the transport connection is in theT_INCON state.The<I>addr</I>and<I>opt</I>fields of<I>call</I>are ignored.In all other cases,<I>call</I>need only be used when data is being sent with the disconnection request.The<I>addr</I>,<I>opt</I>and<I>sequence</I>fields of the<B>t_call</B>structure are ignored.If the user does not wish to send data to the remote user,the value of<I>call</I>may be a null pointer.<p>The<I>udata</I>structurespecifies the user data to be sent to the remote user.The amount of user data must not exceed the limits supported bythe transport provider, as returnedin 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,no data will be sent to the remote user.</blockquote><h4>VALID STATES</h4><blockquote>T_DATAXFER,T_OUTCON,T_OUTREL,T_INREL,T_INCON(ocnt > 0)</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>[TBADDATA]<dd>The amount of user data specified was not within the bounds allowed bythe transport provider.<dt>[TBADSEQ]<dd>An invalid sequence number was specified, or anull<I>call</I>pointerwas specified, when rejecting a connection request.<dt>[TLOOK]<dd>An asynchronous event, which requires attention, has occurred.<dt>[TNOTSUPPORT]<dd>This function is not supported by the underlying transportprovider.<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_connect.html">t_connect()</a></i>,<i><a href="t_getinfo.html">t_getinfo()</a></i>,<i><a href="t_listen.html">t_listen()</a></i>,<i><a href="t_open.html">t_open()</a></i>.</blockquote><h4>CAVEATS</h4><blockquote><i>t_snddis()</i>is an abortive disconnection. Therefore a<i>t_snddis()</i>issued on a connection endpoint may cause data previously sent via<i><a href="t_snd.html">t_snd()</a></i>,or data not yet received, to be lost (even if an error is returned).</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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -