1<html lang="en"> 2<head> 3<title>tmpfile - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Stdio.html#Stdio" title="Stdio"> 9<link rel="prev" href="swscanf.html#swscanf" title="swscanf"> 10<link rel="next" href="tmpnam.html#tmpnam" title="tmpnam"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="tmpfile"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="tmpnam.html#tmpnam">tmpnam</a>, 31Previous: <a rel="previous" accesskey="p" href="swscanf.html#swscanf">swscanf</a>, 32Up: <a rel="up" accesskey="u" href="Stdio.html#Stdio">Stdio</a> 33<hr> 34</div> 35 36<h3 class="section">4.64 <code>tmpfile</code>—create a temporary file</h3> 37 38<p><a name="index-tmpfile-315"></a><a name="index-g_t_005ftmpfile_005fr-316"></a><strong>Synopsis</strong> 39<pre class="example"> #include <stdio.h> 40 FILE *tmpfile(void); 41 42 FILE *_tmpfile_r(struct _reent *<var>reent</var>); 43 44</pre> 45 <p><strong>Description</strong><br> 46Create a temporary file (a file which will be deleted automatically), 47using a name generated by <code>tmpnam</code>. The temporary file is opened with 48the mode <code>"wb+"</code>, permitting you to read and write anywhere in it 49as a binary file (without any data transformations the host system may 50perform for text files). 51 52 <p>The alternate function <code>_tmpfile_r</code> is a reentrant version. The 53argument <var>reent</var> is a pointer to a reentrancy structure. 54 55 <p><br> 56<strong>Returns</strong><br> 57<code>tmpfile</code> normally returns a pointer to the temporary file. If no 58temporary file could be created, the result is NULL, and <code>errno</code> 59records the reason for failure. 60 61 <p><br> 62<strong>Portability</strong><br> 63Both ANSI C and the System V Interface Definition (Issue 2) require 64<code>tmpfile</code>. 65 66 <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>getpid</code>, 67<code>isatty</code>, <code>lseek</code>, <code>open</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. 68 69 <p><code>tmpfile</code> also requires the global pointer <code>environ</code>. 70 71 <p><br> 72 73 </body></html> 74 75