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| <h3 class="section">4.3 <code>dprintf</code>, <code>vdprintf</code>—print to a file descriptor</h3> |
| |
| <p><a name="index-dprintf-150"></a><a name="index-g_t_005fdprintf_005fr-151"></a><a name="index-vdprintf-152"></a><a name="index-g_t_005fvdprintf_005fr-153"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| #include <stdarg.h> |
| int dprintf(int <var>fd</var>, const char *<var>format</var>, ...); |
| int vdprintf(int <var>fd</var>, const char *<var>format</var>, va_list <var>ap</var>); |
| int _dprintf_r(struct _reent *<var>ptr</var>, int <var>fd</var>, |
| const char *<var>format</var>, ...); |
| int _vdprintf_r(struct _reent *<var>ptr</var>, int <var>fd</var>, |
| const char *<var>format</var>, va_list <var>ap</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>dprintf</code> and <code>vdprintf</code> allow printing a format, similarly to |
| <code>printf</code>, but write to a file descriptor instead of to a <code>FILE</code> |
| stream. |
| |
| <p>The functions <code>_dprintf_r</code> and <code>_vdprintf_r</code> are simply |
| reentrant versions of the functions above. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The return value and errors are exactly as for <code>write</code>, except that |
| <code>errno</code> may also be set to <code>ENOMEM</code> if the heap is exhausted. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| This function is originally a GNU extension in glibc and is not portable. |
| |
| <p>Supporting OS subroutines required: <code>sbrk</code>, <code>write</code>. |
| |
| <p><br> |
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