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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>fileno</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><a name = "tag_000_005_086"> </a>NAME</h4><blockquote>fileno - map a stream pointer to a file descriptor</blockquote><h4><a name = "tag_000_005_087"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>int fileno(FILE *<i>stream</i>);</code></pre></blockquote><h4><a name = "tag_000_005_088"> </a>DESCRIPTION</h4><blockquote>The<i>fileno()</i>function returns the integer file descriptorassociated with the stream pointed to by<i>stream</i>.</blockquote><h4><a name = "tag_000_005_089"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>fileno()</i>returns the integer value of the file descriptor associated with<i>stream</i>.Otherwise, the value -1 is returned and<i>errno</i>is set to indicate the error.</blockquote><h4><a name = "tag_000_005_090"> </a>ERRORS</h4><blockquote>The<i>fileno()</i>function may fail if:<dl compact><dt>[EBADF]<dd>The<i>stream</i>argument is not a valid stream.</dl></blockquote><h4><a name = "tag_000_005_091"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_092"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_093"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_094"> </a>SEE ALSO</h4><blockquote><i><a href="fdopen.html">fdopen()</a></i>,<i><a href="fopen.html">fopen()</a></i>,<i><a href="stdin.html">stdin</a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>,<a href="stdio.html">Standard I/O Streans</a>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</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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