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Ref-docs/POSIX/susv3/functions/fwrite.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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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>fwrite</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="fwrite"></a> <a name="tag_03_205"></a><!-- fwrite -->
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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_205_01"></a>NAME</h4>
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<blockquote>fwrite - binary output</blockquote>
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<h4><a name="tag_03_205_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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size_t fwrite(const void *restrict</tt> <i>ptr</i><tt>, size_t</tt> <i>size</i><tt>, size_t</tt> <i>nitems</i><tt>,<br>
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FILE *restrict</tt> <i>stream</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_205_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>The <i>fwrite</i>() function shall write, from the array pointed to by <i>ptr</i>, up to <i>nitems</i> elements whose size is
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specified by <i>size</i>, to the stream pointed to by <i>stream</i>. For each object, <i>size</i> calls shall be made to the <a
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href="../functions/fputc.html"><i>fputc</i>()</a> function, taking the values (in order) from an array of <b>unsigned char</b>
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exactly overlaying the object. The file-position indicator for the stream (if defined) shall be advanced by the number of bytes
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successfully written. If an error occurs, the resulting value of the file-position indicator for the stream is unspecified.</p>
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<p><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> The
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<i>st_ctime</i> and <i>st_mtime</i> fields of the file shall be marked for update between the successful execution of
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<i>fwrite</i>() and the next successful completion of a call to <a href="../functions/fflush.html"><i>fflush</i>()</a> or <a href=
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"../functions/fclose.html"><i>fclose</i>()</a> on the same stream, or a call to <a href="../functions/exit.html"><i>exit</i>()</a>
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or <a href="../functions/abort.html"><i>abort</i>()</a>. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_205_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>fwrite</i>() function shall return the number of elements successfully written, which may be less than <i>nitems</i> if a
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write error is encountered. If <i>size</i> or <i>nitems</i> is 0, <i>fwrite</i>() shall return 0 and the state of the stream
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remains unchanged. Otherwise, if a write error occurs, the error indicator for the stream shall be set, <sup>[<a href=
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"javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> and
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<i>errno</i> shall be set to indicate the error. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_205_05"></a>ERRORS</h4>
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<blockquote>
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<p>Refer to <a href="fputc.html"><i>fputc</i>()</a> .</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_205_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_205_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>Because of possible differences in element length and byte ordering, files written using <i>fwrite</i>() are
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application-dependent, and possibly cannot be read using <a href="../functions/fread.html"><i>fread</i>()</a> by a different
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application or by the same application on a different processor.</p>
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</blockquote>
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<h4><a name="tag_03_205_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_205_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_205_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="ferror.html"><i>ferror</i>()</a> , <a href="fopen.html"><i>fopen</i>()</a> , <a href="printf.html"><i>printf</i>()</a>
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, <a href="putc.html"><i>putc</i>()</a> , <a href="puts.html"><i>puts</i>()</a> , <a href="write.html"><i>write</i>()</a> , the
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Base Definitions volume of 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_205_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_205_12"></a>Issue 6</h4>
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<blockquote>
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<p>Extensions beyond the ISO C standard are marked.</p>
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<p>The following changes are made for alignment with the ISO/IEC 9899:1999 standard:</p>
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<ul>
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<li>
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<p>The <i>fwrite</i>() prototype is updated.</p>
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</li>
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<li>
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<p>The DESCRIPTION is updated to clarify how the data is written out using <a href=
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"../functions/fputc.html"><i>fputc</i>()</a>.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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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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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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