159 lines
5.8 KiB
HTML
159 lines
5.8 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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<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>tempnam</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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<basefont size="3"> <a name="tempnam"></a> <a name="tag_03_772"></a><!-- tempnam -->
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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_772_01"></a>NAME</h4>
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<blockquote>tempnam - create a name for a temporary file</blockquote>
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<h4><a name="tag_03_772_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/stdio.h.html">stdio.h</a>><br>
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<br>
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char *tempnam(const char *</tt><i>dir</i><tt>, const char *</tt><i>pfx</i><tt>); <img src="../images/opt-end.gif" alt=
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"[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_772_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>tempnam</i>() function shall generate a pathname that may be used for a temporary file.</p>
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<p>The <i>tempnam</i>() function allows the user to control the choice of a directory. The <i>dir</i> argument points to the name
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of the directory in which the file is to be created. If <i>dir</i> is a null pointer or points to a string which is not a name for
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an appropriate directory, the path prefix defined as P_tmpdir in the <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a>
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header shall be used. If that directory is not accessible, an implementation-defined directory may be used.</p>
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<p>Many applications prefer their temporary files to have certain initial letter sequences in their names. The <i>pfx</i> argument
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should be used for this. This argument may be a null pointer or point to a string of up to five bytes to be used as the beginning
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of the filename.</p>
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<p>Some implementations of <i>tempnam</i>() may use <a href="../functions/tmpnam.html"><i>tmpnam</i>()</a> internally. On such
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implementations, if called more than {TMP_MAX} times in a single process, the behavior is implementation-defined.</p>
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</blockquote>
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<h4><a name="tag_03_772_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>tempnam</i>() shall allocate space for a string, put the generated pathname in that space, and
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return a pointer to it. The pointer shall be suitable for use in a subsequent call to <a href=
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"../functions/free.html"><i>free</i>()</a>. Otherwise, it shall return a null pointer and set <i>errno</i> to indicate the
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error.</p>
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</blockquote>
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<h4><a name="tag_03_772_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>tempnam</i>() function shall fail if:</p>
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<dl compact>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient storage space is available.</dd>
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</dl>
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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_772_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_772_06_01"></a>Generating a Pathname</h5>
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<p>The following example generates a pathname for a temporary file in directory <b>/tmp</b>, with the prefix <i>file</i>. After the
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filename has been created, the call to <a href="../functions/free.html"><i>free</i>()</a> deallocates the space used to store the
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filename.</p>
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<pre>
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<tt>#include <stdio.h>
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#include <stdlib.h>
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...
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char *directory = "/tmp";
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char *fileprefix = "file";
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char *file;
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<br>
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file = tempnam(directory, fileprefix);
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free(file);
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_772_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>This function only creates pathnames. It is the application's responsibility to create and remove the files. Between the time a
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pathname is created and the file is opened, it is possible for some other process to create a file with the same name. Applications
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may find <a href="../functions/tmpfile.html"><i>tmpfile</i>()</a> more useful.</p>
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</blockquote>
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<h4><a name="tag_03_772_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_772_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_772_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="free.html"><i>free</i>()</a> , <a href="open.html"><i>open</i>()</a> , <a
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href="tmpfile.html"><i>tmpfile</i>()</a> , <a href="tmpnam.html"><i>tmpnam</i>()</a> , <a href="unlink.html"><i>unlink</i>()</a> ,
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the 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_772_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_772_12"></a>Issue 5</h4>
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<blockquote>
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<p>The last paragraph of the DESCRIPTION was included as an APPLICATION USAGE note in previous issues.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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