213 lines
7.9 KiB
HTML
213 lines
7.9 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>tmpfile</title>
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<basefont size="3"> <a name="tmpfile"></a> <a name="tag_03_781"></a><!-- tmpfile -->
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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_781_01"></a>NAME</h4>
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<blockquote>tmpfile - create a temporary file</blockquote>
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<h4><a name="tag_03_781_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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FILE *tmpfile(void);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_781_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>tmpfile</i>() function shall create a temporary file and open a corresponding stream. The file shall be automatically
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deleted when all references to the file are closed. The file is opened as in <a href="../functions/fopen.html"><i>fopen</i>()</a>
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for update (<i>w</i>+).</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"> In
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some implementations, a permanent file may be left behind if the process calling <i>tmpfile</i>() is killed while it is processing
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a call to <i>tmpfile</i>().</p>
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<p>An error message may be written to standard error if the stream cannot be opened. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_781_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>tmpfile</i>() shall return a pointer to the stream of the file that is created. Otherwise, it
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shall return a null pointer <sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> and set <i>errno</i> to indicate the error. <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></p>
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</blockquote>
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<h4><a name="tag_03_781_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>tmpfile</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINTR]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> A
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signal was caught during <i>tmpfile</i>(). <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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<dt>[EMFILE]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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{OPEN_MAX} file descriptors are currently open in the calling process. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></dd>
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<dt>[ENFILE]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The maximum allowable number of files is currently open in the system. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></dd>
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<dt>[ENOSPC]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The directory or file system which would contain the new file cannot be expanded. <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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<dt>[EOVERFLOW]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The file is a regular file and the size of the file cannot be represented correctly in an object of type <b>off_t</b>. <img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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</dl>
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<p>The <i>tmpfile</i>() function may fail if:</p>
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<dl compact>
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<dt>[EMFILE]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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{FOPEN_MAX} streams are currently open in the calling process. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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<dt>[ENOMEM]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Insufficient storage space is available. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></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_781_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_781_06_01"></a>Creating a Temporary File</h5>
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<p>The following example creates a temporary file for update, and returns a pointer to a stream for the created file in the
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<i>fp</i> variable.</p>
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<pre>
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<tt>#include <stdio.h>
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...
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FILE *fp;
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<br>
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fp = tmpfile ();
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_781_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>It should be possible to open at least {TMP_MAX} temporary files during the lifetime of the program (this limit may be shared
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with <a href="../functions/tmpnam.html"><i>tmpnam</i>()</a>) and there should be no limit on the number simultaneously open other
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than this limit and any limit on the number of open files ( {FOPEN_MAX}).</p>
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</blockquote>
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<h4><a name="tag_03_781_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_781_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_781_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="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_781_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_781_12"></a>Issue 5</h4>
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<blockquote>
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<p>Large File Summit extensions are added.</p>
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<p>The last two paragraphs of the DESCRIPTION were included as APPLICATION USAGE notes in previous issues.</p>
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</blockquote>
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<h4><a name="tag_03_781_13"></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 new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>In the ERRORS section, the [EOVERFLOW] condition is added. This change is to support large files.</p>
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</li>
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<li>
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<p>The [EMFILE] optional error condition is added.</p>
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</li>
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</ul>
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<p>The APPLICATION USAGE section is added 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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<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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