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116 lines
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<a name="fputs"></a>
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Next: <a href="fputwc.html#fputwc" accesskey="n" rel="next">fputwc</a>, Previous: <a href="fputc.html#fputc" accesskey="p" rel="prev">fputc</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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<a name="fputs_002c-fputs_005funlocked_002d_002d_002dwrite-a-character-string-in-a-file-or-stream"></a>
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<h3 class="section">4.21 <code>fputs</code>, <code>fputs_unlocked</code>—write a character string in a file or stream</h3>
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<a name="index-fputs"></a>
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<a name="index-fputs_005funlocked"></a>
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<a name="index-_005ffputs_005fr"></a>
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<a name="index-_005ffputs_005funlocked_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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int fputs(const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);
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#define _GNU_SOURCE
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#include <stdio.h>
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int fputs_unlocked(const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);
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#include <stdio.h>
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int _fputs_r(struct _reent *<var>ptr</var>, const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);
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#include <stdio.h>
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int _fputs_unlocked_r(struct _reent *<var>ptr</var>, const char *restrict <var>s</var>, FILE *restrict <var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>fputs</code> writes the string at <var>s</var> (but without the trailing null)
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to the file or stream identified by <var>fp</var>.
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</p>
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<p><code>fputs_unlocked</code> is a non-thread-safe version of <code>fputs</code>.
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<code>fputs_unlocked</code> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the (FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<code>fputs_unlocked</code> is equivalent to <code>fputs</code>.
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</p>
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<p><code>_fputs_r</code> and <code>_fputs_unlocked_r</code> are simply reentrant versions of the
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above that take an additional reentrant struct pointer argument: <var>ptr</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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If successful, the result is <code>0</code>; otherwise, the result is <code>EOF</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>fputs</code>, but does not specify that the result on
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success must be <code>0</code>; any non-negative value is permitted.
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</p>
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<p><code>fputs_unlocked</code> is a GNU extension.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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