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| <h3 class="section">4.19 <code>fpurge</code>—discard pending file I/O</h3> |
| |
| <p><a name="index-fpurge-181"></a><a name="index-g_t_005ffpurge_005fr-182"></a><a name="index-g_t_005f_005ffpurge-183"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| int fpurge(FILE *<var>fp</var>); |
| |
| int _fpurge_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| #include <stdio_ext.h> |
| void __fpurge(FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| Use <code>fpurge</code> to clear all buffers of the given stream. For output |
| streams, this discards data not yet written to disk. For input streams, |
| this discards any data from <code>ungetc</code> and any data retrieved from disk |
| but not yet read via <code>getc</code>. This is more severe than <code>fflush</code>, |
| and generally is only needed when manually altering the underlying file |
| descriptor of a stream. |
| |
| <p><code>__fpurge</code> behaves exactly like <code>fpurge</code> but does not return a value. |
| |
| <p>The alternate function <code>_fpurge_r</code> is a reentrant version, where the |
| extra argument <var>reent</var> is a pointer to a reentrancy structure, and |
| <var>fp</var> must not be NULL. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>fpurge</code> returns <code>0</code> unless <var>fp</var> is not valid, in which case it |
| returns <code>EOF</code> and sets <code>errno</code>. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| These functions are not portable to any standard. |
| |
| <p>No supporting OS subroutines are required. |
| |
| <p><br> |
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