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102 lines
4.1 KiB
HTML
102 lines
4.1 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>dprintf (The Red Hat newlib C Library)</title>
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<meta name="description" content="dprintf (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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<body lang="en">
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<a name="dprintf"></a>
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<div class="header">
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<p>
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Next: <a href="fclose.html#fclose" accesskey="n" rel="next">fclose</a>, Previous: <a href="diprintf.html#diprintf" accesskey="p" rel="prev">diprintf</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="dprintf_002c-vdprintf_002d_002d_002dprint-to-a-file-descriptor"></a>
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<h3 class="section">4.3 <code>dprintf</code>, <code>vdprintf</code>—print to a file descriptor</h3>
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<a name="index-dprintf"></a>
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<a name="index-_005fdprintf_005fr"></a>
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<a name="index-vdprintf"></a>
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<a name="index-_005fvdprintf_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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#include <stdarg.h>
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int dprintf(int <var>fd</var>, const char *restrict <var>format</var>, ...);
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int vdprintf(int <var>fd</var>, const char *restrict <var>format</var>,
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va_list <var>ap</var>);
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int _dprintf_r(struct _reent *<var>ptr</var>, int <var>fd</var>,
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const char *restrict <var>format</var>, ...);
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int _vdprintf_r(struct _reent *<var>ptr</var>, int <var>fd</var>,
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const char *restrict <var>format</var>, va_list <var>ap</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>dprintf</code> and <code>vdprintf</code> allow printing a format, similarly to
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<code>printf</code>, but write to a file descriptor instead of to a <code>FILE</code>
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stream.
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</p>
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<p>The functions <code>_dprintf_r</code> and <code>_vdprintf_r</code> are simply
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reentrant versions of the functions above.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The return value and errors are exactly as for <code>write</code>, except that
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<code>errno</code> may also be set to <code>ENOMEM</code> if the heap is exhausted.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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This function is originally a GNU extension in glibc and is not portable.
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</p>
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<p>Supporting OS subroutines required: <code>sbrk</code>, <code>write</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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