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<h2 class="title" style="clear: both"><a id="db_env_set_func_ftruncate"></a>db_env_set_func_ftruncate</h2>
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<pre class="programlisting">#include <db.h>
int
db_env_set_func_ftruncate(int (*func_ftruncate)(int fd, off_t offset)); </pre>
<p>
The Berkeley DB library requires the ability to truncate a file.
</p>
<p>
The <code class="function">db_env_set_func_ftruncate</code> function configures all operations
performed by a process and all of its threads of control, not
operations confined to a single database environment.
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<p>
Although the <code class="function">db_env_set_func_ftruncate</code> function may be called at any
time during the life of the application, it should normally be called
before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or
<a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods.
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<p>
The <code class="function">db_env_set_func_ftruncate()</code> <span>
function returns a non-zero error value on failure and 0 on success.
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<h4 class="title"><a id="idp55628880"></a>func_ftruncate</h4>
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<p>
The <span class="bold"><strong>func_ftruncate</strong></span> parameter is the
function which truncates a file.
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The <span class="bold"><strong>fd</strong></span> parameter is an open file
descriptor on the file.
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The <span class="bold"><strong>ftruncate</strong></span> function must truncate
the file to the byte length specified by the <span class="bold"><strong>offset</strong></span> parameter.
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The <span class="bold"><strong>func_ftruncate</strong></span> function must
return the value of <span class="bold"><strong>errno</strong></span> on failure
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