145 lines
4.2 KiB
HTML
145 lines
4.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>setbuf</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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</script>
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<basefont size="3"> <a name="setbuf"></a> <a name="tag_03_644"></a><!-- setbuf -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_644_01"></a>NAME</h4>
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<blockquote>setbuf - assign buffering to a stream</blockquote>
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<h4><a name="tag_03_644_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/stdio.h.html">stdio.h</a>><br>
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<br>
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void setbuf(FILE *restrict</tt> <i>stream</i><tt>, char *restrict</tt> <i>buf</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_644_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>Except that it returns no value, the function call:</p>
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<pre>
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<tt>setbuf(stream, buf)
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</tt>
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</pre>
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<p>shall be equivalent to:</p>
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<pre>
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<tt>setvbuf(stream, buf, _IOFBF, BUFSIZ)
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</tt>
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</pre>
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<p>if <i>buf</i> is not a null pointer, or to:</p>
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<pre>
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<tt>setvbuf(stream, buf, _IONBF, BUFSIZ)
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</tt>
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</pre>
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<p>if <i>buf</i> is a null pointer.</p>
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</blockquote>
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<h4><a name="tag_03_644_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>setbuf</i>() function shall not return a value.</p>
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</blockquote>
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<h4><a name="tag_03_644_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_644_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_644_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>A common source of error is allocating buffer space as an "automatic" variable in a code block, and then failing to close the
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stream in the same block.</p>
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<p>With <i>setbuf</i>(), allocating a buffer of BUFSIZ bytes does not necessarily imply that all of BUFSIZ bytes are used for the
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buffer area.</p>
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</blockquote>
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<h4><a name="tag_03_644_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_644_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_644_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="fopen.html"><i>fopen</i>()</a> , <a href="setvbuf.html"><i>setvbuf</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_644_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_644_12"></a>Issue 6</h4>
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<blockquote>
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<p>The prototype for <i>setbuf</i>() is updated for alignment with the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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