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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_rcvconnect</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_rcvconnect - receive the confirmation from a connection request</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="xti.h.html">xti.h</a>>int t_rcvconnect( int fd, 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>x<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>x<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>x<tr valign=top><td align=left>call-><td align=center>udata.len<td align=center>/<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 enables a calling transport user to determinethe status of a previously sent connection requestand is used in conjunction with<i><a href="t_connect.html">t_connect()</a></i>to establish a connection in asynchronous mode,and to complete a synchronous <i><a href="t_connect.html">t_connect()</a></i>call that was interrupted by a signal.The connection will be established on successful completion ofthis function.<p>The argument<I>fd</I>identifies the local transport endpoint where communication will beestablished,and<I>call</I>contains information associated with the newly established connection.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>In<I>call</I>,<I>addr</I>returns the protocol address associated with the respondingtransport endpoint,<I>opt</I>presents any options associated with the connection,<I>udata</I>points to optional user data that may be returned bythe destination transport user during connection establishment,and<I>sequence</I>has no meaning for this function.<p>The<I>maxlen</I>field of each argumentmust be set before issuing this function to indicate the maximumsize of the buffer for each.However, <I>maxlen</I>can be set to zero, in which case noinformation to this specific argument is given to the useron the return from <i>t_rcvconnect()</i>.If <I>call</I>is set to NULL, no information at all is returned.By default,<i>t_rcvconnect()</i>executes in synchronous mode andwaits for the connection to be established before returning.On return, the<I>addr</I>,<I>opt</I>and<I>udata</I>fields reflect values associated with the connection.<p>If O_NONBLOCKis set (via<i><a href="t_open.html">t_open()</a></i>or<i><a href="fcntl.html">fcntl()</a></i>),<i>t_rcvconnect()</i>executes in asynchronous mode, andreduces to a poll for existing connection confirmations.If none are available,<i>t_rcvconnect()</i>fails and returns immediatelywithout waiting for the connection to be established.(See [TNODATA] below.)In this case,<i>t_rcvconnect()</i>must be called again to complete the connection establishment phase andretrieve the information returned in<I>call</I>.</blockquote><h4>VALID STATES</h4><blockquote>T_OUTCON</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 an incoming argument<I>(maxlen)</I>is greater than 0 but notsufficient to store the value of that argument,and the connection information to be returned in<I>call</I>will be discarded.The provider's state, as seen by the user, will be changedto T_DATAXFER.<dt>[TLOOK]<dd>An asynchronous event has occurred on this transport connection and requiresimmediate attention.<dt>[TNODATA]<dd>O_NONBLOCKwas set, but a connection confirmation has not yet arrived.<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_accept.html">t_accept()</a></i>,<i><a href="t_alloc.html">t_alloc()</a></i>,<i><a href="t_bind.html">t_bind()</a></i>,<i><a href="t_connect.html">t_connect()</a></i>,<i><a href="t_listen.html">t_listen()</a></i>,<i><a href="t_open.html">t_open()</a></i>,<i><a href="t_optmgmt.html">t_optmgmt()</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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