2 Unix SMB/CIFS implementation.
5 Copyright (C) Andrew Tridgell 2004
6 Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "system/filesys.h"
24 #include "lib/util/dlinklist.h"
25 #include "lib/util/debug.h"
29 Log tdb messages via DEBUG().
31 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
32 const char *format, ...) PRINTF_ATTRIBUTE(3,4);
34 static void tdb_wrap_log(TDB_CONTEXT *tdb, enum tdb_debug_level level,
35 const char *format, ...)
49 case TDB_DEBUG_WARNING:
60 ret = vasprintf(&ptr, format, ap);
64 const char *name = tdb_name(tdb);
65 DEBUG(debuglevel, ("tdb(%s): %s", name ? name : "unnamed", ptr));
70 struct tdb_wrap_private {
71 struct tdb_context *tdb;
73 struct tdb_wrap_private *next, *prev;
76 static struct tdb_wrap_private *tdb_list;
78 /* destroy the last connection to a tdb */
79 static int tdb_wrap_private_destructor(struct tdb_wrap_private *w)
82 DLIST_REMOVE(tdb_list, w);
86 static struct tdb_wrap_private *tdb_wrap_private_open(TALLOC_CTX *mem_ctx,
93 struct tdb_wrap_private *result;
94 struct tdb_logging_context lctx = { .log_fn = tdb_wrap_log };
96 result = talloc_pooled_object(mem_ctx, struct tdb_wrap_private,
101 /* Doesn't fail, see talloc_pooled_object */
102 result->name = talloc_strdup(result, name);
105 * TDB files don't make sense after execve()
107 open_flags |= O_CLOEXEC;
109 result->tdb = tdb_open_ex(name, hash_size, tdb_flags,
110 open_flags, mode, &lctx, NULL);
111 if (result->tdb == NULL) {
114 talloc_set_destructor(result, tdb_wrap_private_destructor);
115 DLIST_ADD(tdb_list, result);
124 wrapped connection to a tdb database
125 to close just talloc_free() the tdb_wrap pointer
127 struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
128 const char *name, int hash_size, int tdb_flags,
129 int open_flags, mode_t mode)
131 struct tdb_wrap *result;
132 struct tdb_wrap_private *w;
139 result = talloc(mem_ctx, struct tdb_wrap);
140 if (result == NULL) {
144 for (w=tdb_list;w;w=w->next) {
145 if (strcmp(name, w->name) == 0) {
152 if (tdb_flags & TDB_MUTEX_LOCKING) {
153 if (!tdb_runtime_check_for_robust_mutexes()) {
154 tdb_flags &= ~TDB_MUTEX_LOCKING;
158 w = tdb_wrap_private_open(result, name, hash_size, tdb_flags,
162 * Correctly use talloc_reference: The tdb will be
163 * closed when "w" is being freed. The caller never
164 * sees "w", so an incorrect use of talloc_free(w)
165 * instead of calling talloc_unlink is not possible.
166 * To avoid having to refcount ourselves, "w" will
167 * have multiple parents that hang off all the
168 * tdb_wrap's being returned from here. Those parents
169 * can be freed without problem.
171 if (talloc_reference(result, w) == NULL) {
178 result->tdb = w->tdb;