isastream.html

来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 62 行

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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>isastream</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_029">&nbsp;</a>NAME</h4><blockquote>isastream - test a file descriptor</blockquote><h4><a name = "tag_000_007_030">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="stropts.h.html">stropts.h</a>&gt;int isastream(int <i>fildes</i>);</code></pre></blockquote><h4><a name = "tag_000_007_031">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>isastream()</i>function tests whether<i>fildes</i>,an open file descriptor, is associated with a STREAMS-based file.</blockquote><h4><a name = "tag_000_007_032">&nbsp;</a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>isastream()</i>returns 1 if <i>fildes</i> refers to a STREAMS-based file and 0 if not.Otherwise,<i>isastream()</i>returns -1 and sets <i>errno</i> to indicate the error.</blockquote><h4><a name = "tag_000_007_033">&nbsp;</a>ERRORS</h4><blockquote>The<i>isastream()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The <i>fildes</i> argument is not a valid open file descriptor.</dl></blockquote><h4><a name = "tag_000_007_034">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_035">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_036">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_037">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="stropts.h.html">&lt;stropts.h&gt;</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 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>

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