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17<title>Debugging with GDB: lseek</title>
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70<a name="lseek-1"></a>
71<h4 class="unnumberedsubsubsec">lseek</h4>
72<a name="index-lseek_002c-file_002di_002fo-system-call"></a>
73
74<dl compact="compact">
75<dt>Synopsis:</dt>
76<dd><div class="smallexample">
77<pre class="smallexample">long lseek (int fd, long offset, int flag);
78</pre></div>
79
80</dd>
81<dt>Request:</dt>
82<dd><p>&lsquo;<samp>Flseek,<var>fd</var>,<var>offset</var>,<var>flag</var></samp>&rsquo;
83</p>
84<p><var>flag</var> is one of:
85</p>
86<dl compact="compact">
87<dt><code>SEEK_SET</code></dt>
88<dd><p>The offset is set to <var>offset</var> bytes.
89</p>
90</dd>
91<dt><code>SEEK_CUR</code></dt>
92<dd><p>The offset is set to its current location plus <var>offset</var>
93bytes.
94</p>
95</dd>
96<dt><code>SEEK_END</code></dt>
97<dd><p>The offset is set to the size of the file plus <var>offset</var>
98bytes.
99</p></dd>
100</dl>
101
102</dd>
103<dt>Return value:</dt>
104<dd><p>On success, the resulting unsigned offset in bytes from
105the beginning of the file is returned.  Otherwise, a
106value of -1 is returned.
107</p>
108</dd>
109<dt>Errors:</dt>
110<dd>
111<dl compact="compact">
112<dt><code>EBADF</code></dt>
113<dd><p><var>fd</var> is not a valid open file descriptor.
114</p>
115</dd>
116<dt><code>ESPIPE</code></dt>
117<dd><p><var>fd</var> is associated with the <small>GDB</small> console.
118</p>
119</dd>
120<dt><code>EINVAL</code></dt>
121<dd><p><var>flag</var> is not a proper value.
122</p>
123</dd>
124<dt><code>EINTR</code></dt>
125<dd><p>The call was interrupted by the user.
126</p></dd>
127</dl>
128
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