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102 lines
4.0 KiB
HTML
102 lines
4.0 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>tmpfile (The Red Hat newlib C Library)</title>
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<meta name="description" content="tmpfile (The Red Hat newlib C Library)">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdio.html#Stdio" rel="up" title="Stdio">
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<link href="tmpnam.html#tmpnam" rel="next" title="tmpnam">
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<body lang="en">
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<a name="tmpfile"></a>
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<div class="header">
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<p>
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Next: <a href="tmpnam.html#tmpnam" accesskey="n" rel="next">tmpnam</a>, Previous: <a href="swscanf.html#swscanf" accesskey="p" rel="prev">swscanf</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="tmpfile_002d_002d_002dcreate-a-temporary-file"></a>
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<h3 class="section">4.66 <code>tmpfile</code>—create a temporary file</h3>
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<a name="index-tmpfile"></a>
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<a name="index-_005ftmpfile_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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FILE *tmpfile(void);
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FILE *_tmpfile_r(struct _reent *<var>reent</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Create a temporary file (a file which will be deleted automatically),
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using a name generated by <code>tmpnam</code>. The temporary file is opened with
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the mode <code>"wb+"</code>, permitting you to read and write anywhere in it
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as a binary file (without any data transformations the host system may
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perform for text files).
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</p>
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<p>The alternate function <code>_tmpfile_r</code> is a reentrant version. The
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argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>tmpfile</code> normally returns a pointer to the temporary file. If no
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temporary file could be created, the result is NULL, and <code>errno</code>
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records the reason for failure.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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Both ANSI C and the System V Interface Definition (Issue 2) require
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<code>tmpfile</code>.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>getpid</code>,
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<code>isatty</code>, <code>lseek</code>, <code>open</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<p><code>tmpfile</code> also requires the global pointer <code>environ</code>.
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</p>
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<br>
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</body>
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</html>
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