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| <h3 class="section">4.64 <code>tmpfile</code>—create a temporary file</h3> |
| |
| <p><a name="index-tmpfile-315"></a><a name="index-g_t_005ftmpfile_005fr-316"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| FILE *tmpfile(void); |
| |
| FILE *_tmpfile_r(struct _reent *<var>reent</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| Create a temporary file (a file which will be deleted automatically), |
| using a name generated by <code>tmpnam</code>. The temporary file is opened with |
| the mode <code>"wb+"</code>, permitting you to read and write anywhere in it |
| as a binary file (without any data transformations the host system may |
| perform for text files). |
| |
| <p>The alternate function <code>_tmpfile_r</code> is a reentrant version. The |
| argument <var>reent</var> is a pointer to a reentrancy structure. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>tmpfile</code> normally returns a pointer to the temporary file. If no |
| temporary file could be created, the result is NULL, and <code>errno</code> |
| records the reason for failure. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| Both ANSI C and the System V Interface Definition (Issue 2) require |
| <code>tmpfile</code>. |
| |
| <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>getpid</code>, |
| <code>isatty</code>, <code>lseek</code>, <code>open</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. |
| |
| <p><code>tmpfile</code> also requires the global pointer <code>environ</code>. |
| |
| <p><br> |
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