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<title>The Red Hat newlib C Library: fputs</title>

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<a name="fputs"></a>
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<hr>
<a name="fputs_002c-fputs_005funlocked_002d_002d_002dwrite-a-character-string-in-a-file-or-stream"></a>
<h3 class="section">4.21 <code>fputs</code>, <code>fputs_unlocked</code>&mdash;write a character string in a file or stream</h3>
<a name="index-fputs"></a>
<a name="index-fputs_005funlocked"></a>
<a name="index-_005ffputs_005fr"></a>
<a name="index-_005ffputs_005funlocked_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
int fputs(const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);

#define _GNU_SOURCE
#include &lt;stdio.h&gt;
int fputs_unlocked(const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);

#include &lt;stdio.h&gt;
int _fputs_r(struct _reent *<var>ptr</var>, const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);

#include &lt;stdio.h&gt;
int _fputs_unlocked_r(struct _reent *<var>ptr</var>, const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>fputs</code> writes the string at <var>s</var> (but without the trailing null)
to the file or stream identified by <var>fp</var>.
</p>
<p><code>fputs_unlocked</code> is a non-thread-safe version of <code>fputs</code>.
<code>fputs_unlocked</code> may only safely be used within a scope
protected by flockfile() (or ftrylockfile()) and funlockfile().  This
function may safely be used in a multi-threaded program if and only
if they are called while the invoking thread owns the (FILE *)
object, as is the case after a successful call to the flockfile() or
ftrylockfile() functions.  If threads are disabled, then
<code>fputs_unlocked</code> is equivalent to <code>fputs</code>.
</p>
<p><code>_fputs_r</code> and <code>_fputs_unlocked_r</code> are simply reentrant versions of the
above that take an additional reentrant struct pointer argument: <var>ptr</var>.
</p>
<br>
<p><strong>Returns</strong><br>
If successful, the result is <code>0</code>; otherwise, the result is <code>EOF</code>.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>fputs</code>, but does not specify that the result on
success must be <code>0</code>; any non-negative value is permitted.
</p>
<p><code>fputs_unlocked</code> is a GNU extension.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
</p>
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