📄 t_look.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_look</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_look - look at the current event on a transport endpoint</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="xti.h.html">xti.h</a>>int t_look( int fd)</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>/</table></pre><p>This function returns the current event on the transport endpointspecified by<I>fd</I>.This function enables a transport provider to notify a transport user ofan asynchronous event when the user is calling functions in synchronousmode.Certain events require immediate notification of the user and are indicatedby a specific error, [TLOOK], on the current or next function to beexecuted. Details on events which cause functions to fail [TLOOK] may befound in<xref href=etleind></xref>.<p>This function also enables a transport user to poll atransport endpoint periodically for asynchronous events.</blockquote><h4>VALID STATES</h4><blockquote>ALL - apart from T_UNINIT</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>[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 success,<i>t_look()</i>returns a value that indicates which of the allowableevents has occurred, or returns zero if no event exists.One of the following events is returned:<dl compact><dt>T_LISTEN<dd>Connection indication received.<dt>T_CONNECT<dd>Connect confirmation received.<dt>T_DATA<dd>Normal data received.<dt>T_EXDATA<dd>Expedited data received.<dt>T_DISCONNECT<dd>Disconnection received.<dt>T_UDERR<dd>Datagram error indication.<dt>T_ORDREL<dd>Orderly release indication.<dt>T_GODATA<dd>Flow control restrictions on normal data flow that led to a [TFLOW]error have been lifted.Normal data may be sent again.<dt>T_GOEXDATA<dd>Flow control restrictions on expedited data flow that led to a [TFLOW]error have been lifted.Expedited data may be sent again.</dl><p>On failure, -1 is returned and<I>t_errno</I>is set to indicate the error.</blockquote><h4>SEE ALSO</h4><blockquote><i><a href="t_open.html">t_open()</a></i>,<i><a href="t_snd.html">t_snd()</a></i>,<i><a href="t_sndudata.html">t_sndudata()</a></i>.</blockquote><h4>APPLICATION USAGE</h4><blockquote>Additional functionality is provided through theEvent Management (EM) interface.</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 + -