With locking disabled (if `gdbm_open' was called with GDBM_NOLOCK),
the user may want to perform their own file locking on the database file
in order to prevent multiple writers operating on the same file
In order to support this, the `gdbm_fdesc' routine is provided.
ret = gdbm_fdesc(dbf);
The single valid parameter is:
The pointer returned by `gdbm_open'.
The return value will be the file descriptor of the database.
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