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Berkeley DB: Db::fd
Db::fd
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#include <db_cxx.h>
int
Db::fd(int *fdp);
Description: Db::fd
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 Db::open with
the same file parameter.
This file descriptor may be safely used as a parameter to the
fcntl(2) and flock(2) locking functions. The file
descriptor is not necessarily associated with any of the underlying
files actually used by the access method.
The Db::fd method only supports a coarse-grained form of locking.
Applications should instead use the Berkeley DB lock manager where possible.
The Db::fd method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
Parameters
- fdp
- The fdp parameter references memory into which
the current file descriptor is copied.
Class
Db
See Also
Databases and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
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