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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>setbuf</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_008_384"> </a>NAME</h4><blockquote>setbuf - assign buffering to a stream</blockquote><h4><a name = "tag_000_008_385"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>void setbuf(FILE *<i>stream</i>, char *<i>buf</i>);</code></pre></blockquote><h4><a name = "tag_000_008_386"> </a>DESCRIPTION</h4><blockquote>Except that it returns no value,the function call:<pre><code>setbuf(stream, buf)</code></pre>is equivalent to:<pre><code>setvbuf(stream, buf, _IOFBF, BUFSIZ)</code></pre><p>if<i>buf</i>is not a null pointer, or to:<pre><code>setvbuf(stream, buf, _IONBF, BUFSIZ)</code></pre><p>if<i>buf</i>is a null pointer.</blockquote><h4><a name = "tag_000_008_387"> </a>RETURN VALUE</h4><blockquote>The<i>setbuf()</i>function returns no value.</blockquote><h4><a name = "tag_000_008_388"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_008_389"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_390"> </a>APPLICATION USAGE</h4><blockquote>A common source of error is allocating buffer spaceas an "automatic" variable in a code block, and thenfailing to close the stream in the same block.<p>With<i>setbuf()</i>,allocating a buffer of BUFSIZ bytes does not necessarily implythat all of BUFSIZ bytes are used for the buffer area.</blockquote><h4><a name = "tag_000_008_391"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_392"> </a>SEE ALSO</h4><blockquote><i><a href="fopen.html">fopen()</a></i>,<i><a href="setvbuf.html">setvbuf()</a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>.</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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