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<!--$Id: db_fd.so,v 10.31 2005/06/14 14:06:57 bostic Exp $-->
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<title>Berkeley DB: DB->fd</title>
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<h3>DB->fd</h3>
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<h3><pre>
#include <db.h>
<p>
int
DB->fd(DB *db, int *fdp);
</pre></h3>
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<h3>Description: DB->fd</h3>
<p>The DB->fd method provides access to a file descriptor representative
of the underlying database. A file descriptor referring to the same
file will be returned to all processes that call <a href="../api_c/db_open.html">DB->open</a> with
the same <b>file</b> parameter.</p>
<p>This file descriptor may be safely used as a parameter to the
<b>fcntl</b>(2) and <b>flock</b>(2) locking functions.</p>
<p>The DB->fd method only supports a coarse-grained form of locking.
Applications should instead use the Berkeley DB lock manager where possible.</p>
<p>The DB->fd method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>fdp</b><dd>The <b>fdp</b> parameter references memory into which
the current file descriptor is copied.
</dl>
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<h3>Class</h3>
<a href="../api_c/db_class.html">DB</a>
<h3>See Also</h3>
<a href="../api_c/db_list.html">Databases and Related Methods</a>
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