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6<title>Berkeley DB: db_env_set_func_ftruncate</title>
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13<b>db_env_set_func_ftruncate</b>
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21<b><pre>
22#include &lt;db.h&gt;
23<p>
24int
25db_env_set_func_ftruncate(int (*func_ftruncate)(int fd, off_t offset));
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28<b>Description: db_env_set_func_ftruncate</b>
29<p>The Berkeley DB library requires the ability to truncate a file.</p>
30<p>The db_env_set_func_ftruncate method configures all operations performed by a process and
31all of its threads of control, not operations confined to a single
32database environment.</p>
33<p>Although the db_env_set_func_ftruncate method may be called at any time during the life of
34the application, it should normally be called before making calls to the
35<a href="../api_c/env_class.html">db_env_create</a> or <a href="../api_c/db_class.html">db_create</a> methods.</p>
36<p>The db_env_set_func_ftruncate method
37returns a non-zero error value on failure
38and 0 on success.
39</p>
40<b>Parameters</b> <br>
41 <b>func_ftruncate</b><ul compact><li>The <b>func_ftruncate</b> parameter is the function which truncates a file.
42<p>The <b>fd</b> parameter is an open file descriptor on the file.</p>
43<p>The <b>ftruncate</b> function must truncate the file to the byte
44length specified by the <b>offset</b> parameter.</p>
45<p>The <b>func_ftruncate</b> function must return the value of <b>errno</b> on
46failure and 0 on success.</p></ul>
47<br>
48<br><b>See Also</b>
49<a href="../ref/program/runtime.html">Run-time configuration</a>
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