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<title>Debugging with GDB: lseek</title>
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Next: <a href="rename.html#rename" accesskey="n" rel="next">rename</a>, Previous: <a href="write.html#write" accesskey="p" rel="previous">write</a>, Up: <a href="List-of-Supported-Calls.html#List-of-Supported-Calls" accesskey="u" rel="up">List of Supported Calls</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="lseek-1"></a>
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<h4 class="unnumberedsubsubsec">lseek</h4>
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<a name="index-lseek_002c-file_002di_002fo-system-call"></a>
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<dl compact="compact">
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<dt>Synopsis:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">long lseek (int fd, long offset, int flag);
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</pre></div>
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</dd>
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<dt>Request:</dt>
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<dd><p>‘<samp>Flseek,<var>fd</var>,<var>offset</var>,<var>flag</var></samp>’
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</p>
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<p><var>flag</var> is one of:
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</p>
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<dl compact="compact">
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<dt><code>SEEK_SET</code></dt>
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<dd><p>The offset is set to <var>offset</var> bytes.
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</p>
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</dd>
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<dt><code>SEEK_CUR</code></dt>
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<dd><p>The offset is set to its current location plus <var>offset</var>
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bytes.
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</p>
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</dd>
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<dt><code>SEEK_END</code></dt>
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<dd><p>The offset is set to the size of the file plus <var>offset</var>
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bytes.
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</p></dd>
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</dl>
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</dd>
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<dt>Return value:</dt>
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<dd><p>On success, the resulting unsigned offset in bytes from
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the beginning of the file is returned. Otherwise, a
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value of -1 is returned.
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</p>
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</dd>
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<dt>Errors:</dt>
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<dd>
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<dl compact="compact">
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<dt><code>EBADF</code></dt>
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<dd><p><var>fd</var> is not a valid open file descriptor.
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</p>
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</dd>
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<dt><code>ESPIPE</code></dt>
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<dd><p><var>fd</var> is associated with the <small>GDB</small> console.
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</p>
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</dd>
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<dt><code>EINVAL</code></dt>
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<dd><p><var>flag</var> is not a proper value.
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</p>
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</dd>
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<dt><code>EINTR</code></dt>
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<dd><p>The call was interrupted by the user.
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</p></dd>
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</dl>
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