2 Unix SMB/CIFS implementation.
4 database wrap functions
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 the stupidity of the unix fcntl locking design forces us to never
25 allow a database file to be opened twice in the same process. These
26 wrappers provide convenient access to a tdb or ldb, taking advantage
27 of talloc destructors to ensure that only a single open is done
31 #include "lib/util/dlinklist.h"
32 #include "lib/events/events.h"
33 #include "lib/tdb/include/tdb.h"
36 static struct tdb_wrap *tdb_list;
40 /* destroy the last connection to a tdb */
41 static int tdb_wrap_destructor(struct tdb_wrap *w)
44 DLIST_REMOVE(tdb_list, w);
49 wrapped connection to a tdb database
50 to close just talloc_free() the tdb_wrap pointer
52 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
53 const char *name, int hash_size, int tdb_flags,
54 int open_flags, mode_t mode)
58 for (w=tdb_list;w;w=w->next) {
59 if (strcmp(name, w->name) == 0) {
60 return talloc_reference(mem_ctx, w);
64 w = talloc(mem_ctx, struct tdb_wrap);
69 w->name = talloc_strdup(w, name);
71 w->tdb = tdb_open(name, hash_size, tdb_flags,
78 talloc_set_destructor(w, tdb_wrap_destructor);
80 DLIST_ADD(tdb_list, w);