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| <title>Debugging with GDB: lseek</title> |
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| <a name="lseek-1"></a> |
| <h4 class="unnumberedsubsubsec">lseek</h4> |
| <a name="index-lseek_002c-file_002di_002fo-system-call"></a> |
| |
| <dl compact="compact"> |
| <dt>Synopsis:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">long lseek (int fd, long offset, int flag); |
| </pre></div> |
| |
| </dd> |
| <dt>Request:</dt> |
| <dd><p>‘<samp>Flseek,<var>fd</var>,<var>offset</var>,<var>flag</var></samp>’ |
| </p> |
| <p><var>flag</var> is one of: |
| </p> |
| <dl compact="compact"> |
| <dt><code>SEEK_SET</code></dt> |
| <dd><p>The offset is set to <var>offset</var> bytes. |
| </p> |
| </dd> |
| <dt><code>SEEK_CUR</code></dt> |
| <dd><p>The offset is set to its current location plus <var>offset</var> |
| bytes. |
| </p> |
| </dd> |
| <dt><code>SEEK_END</code></dt> |
| <dd><p>The offset is set to the size of the file plus <var>offset</var> |
| bytes. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt>Return value:</dt> |
| <dd><p>On success, the resulting unsigned offset in bytes from |
| the beginning of the file is returned. Otherwise, a |
| value of -1 is returned. |
| </p> |
| </dd> |
| <dt>Errors:</dt> |
| <dd> |
| <dl compact="compact"> |
| <dt><code>EBADF</code></dt> |
| <dd><p><var>fd</var> is not a valid open file descriptor. |
| </p> |
| </dd> |
| <dt><code>ESPIPE</code></dt> |
| <dd><p><var>fd</var> is associated with the <small>GDB</small> console. |
| </p> |
| </dd> |
| <dt><code>EINVAL</code></dt> |
| <dd><p><var>flag</var> is not a proper value. |
| </p> |
| </dd> |
| <dt><code>EINTR</code></dt> |
| <dd><p>The call was interrupted by the user. |
| </p></dd> |
| </dl> |
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