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<title>db_env_set_func_ftruncate</title>
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<p>Library Version 11.2.5.3</p>
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<th colspan="3" align="center">db_env_set_func_ftruncate</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="db_env_set_func_fsync.html">Prev</a> </td>
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<th width="60%" align="center">Appendix C.
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Berkeley DB Application Space Static Functions
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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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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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db_env_set_func_ftruncate(int (*func_ftruncate)(int fd, off_t offset)); </pre>
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<p>
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The Berkeley DB library requires the ability to truncate a file.
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</p>
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<p>
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The <code class="function">db_env_set_func_ftruncate</code> function configures all operations
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performed by a process and all of its threads of control, not
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operations confined to a single database environment.
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</p>
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<p>
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Although the <code class="function">db_env_set_func_ftruncate</code> function may be called at any
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time during the life of the application, it should normally be called
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before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or
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<a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods.
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</p>
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<p>
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The <code class="function">db_env_set_func_ftruncate()</code> <span>
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function returns a non-zero error value on failure and 0 on success.
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp63587448"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="idp63587640"></a>func_ftruncate</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>func_ftruncate</strong></span> parameter is the
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function which truncates a file.
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</p>
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<p>
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The <span class="bold"><strong>fd</strong></span> parameter is an open file
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descriptor on the file.
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</p>
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<p>
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The <span class="bold"><strong>ftruncate</strong></span> function must truncate
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the file to the byte length specified by the <span class="bold"><strong>offset</strong></span> parameter.
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</p>
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<p>
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The <span class="bold"><strong>func_ftruncate</strong></span> function must
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return the value of <span class="bold"><strong>errno</strong></span> on failure
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and 0 on success.
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</p>
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<div>
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<h3 class="title"><a id="idp63585200"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a href="../../programmer_reference/program_runtime.html" class="olink">Run-time configuration</a>
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