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study/Ref-docs/POSIX/susv3/functions/mkstemp.html
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study/Ref-docs/POSIX/susv3/functions/mkstemp.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>mkstemp</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="mkstemp"></a> <a name="tag_03_374"></a><!-- mkstemp -->
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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_374_01"></a>NAME</h4>
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<blockquote>mkstemp - make a unique filename</blockquote>
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<h4><a name="tag_03_374_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/stdlib.h.html">stdlib.h</a>><br>
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<br>
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int mkstemp(char *</tt><i>template</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_374_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>mkstemp</i>() function shall replace the contents of the string pointed to by <i>template</i> by a unique filename, and
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return a file descriptor for the file open for reading and writing. The function thus prevents any possible race condition between
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testing whether the file exists and opening it for use. The string in <i>template</i> should look like a filename with six trailing
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<tt>'X'</tt> s; <i>mkstemp</i>() replaces each <tt>'X'</tt> with a character from the portable filename character set. The
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characters are chosen such that the resulting name does not duplicate the name of an existing file at the time of a call to
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<i>mkstemp</i>().</p>
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</blockquote>
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<h4><a name="tag_03_374_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>mkstemp</i>() shall return an open file descriptor. Otherwise, -1 shall be returned if no
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suitable file could be created.</p>
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</blockquote>
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<h4><a name="tag_03_374_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_374_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_374_06_01"></a>Generating a Filename</h5>
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<p>The following example creates a file with a 10-character name beginning with the characters <tt>"file"</tt> and opens the file
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for reading and writing. The value returned as the value of <i>fd</i> is a file descriptor that identifies the file.</p>
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<pre>
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<tt>#include <stdlib.h>
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...
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char template[] = "/tmp/fileXXXXXX";
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int fd;
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<br>
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fd = mkstemp(template);
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_374_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>It is possible to run out of letters.</p>
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<p>The <i>mkstemp</i>() function need not check to determine whether the filename part of <i>template</i> exceeds the maximum
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allowable filename length.</p>
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</blockquote>
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<h4><a name="tag_03_374_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_374_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_374_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="getpid.html"><i>getpid</i>()</a> , <a href="open.html"><i>open</i>()</a> , <a href="tmpfile.html"><i>tmpfile</i>()</a>
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, <a href="tmpnam.html"><i>tmpnam</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_374_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4, Version 2.</p>
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</blockquote>
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<h4><a name="tag_03_374_12"></a>Issue 5</h4>
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<blockquote>
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<p>Moved from X/OPEN UNIX extension to BASE.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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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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]</font></center>
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