1 files changed, 103 insertions, 0 deletions
diff --git a/ctdb/lib/util/db_wrap.c b/ctdb/lib/util/db_wrap.c
new file mode 100644
index 0000000000..1b2bf7e228
--- /dev/null
+++ b/ctdb/lib/util/db_wrap.c
@@ -0,0 +1,103 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   database wrap functions
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+  the stupidity of the unix fcntl locking design forces us to never
+  allow a database file to be opened twice in the same process. These
+  wrappers provide convenient access to a tdb or ldb, taking advantage
+  of talloc destructors to ensure that only a single open is done
+*/
+
+#include "includes.h"
+#include "lib/util/dlinklist.h"
+#include "tdb.h"
+#include "db_wrap.h"
+
+static struct tdb_wrap *tdb_list;
+
+
+
+/* destroy the last connection to a tdb */
+static int tdb_wrap_destructor(struct tdb_wrap *w)
+{
+	tdb_close(w->tdb);
+	DLIST_REMOVE(tdb_list, w);
+	return 0;
+}				 
+
+static void log_fn(struct tdb_context *tdb, enum tdb_debug_level level, const char *fmt, ...)
+{
+	if (level <= TDB_DEBUG_ERROR) {
+		va_list ap;
+		this_log_level = level;
+		char newfmt[strlen(tdb_name(tdb)) + 1 + strlen(fmt) + 1];
+		sprintf(newfmt, "%s:%s", tdb_name(tdb), fmt);
+		va_start(ap, fmt);
+		do_debug_v(newfmt, ap);
+		va_end(ap);
+	}
+}
+
+
+/*
+  wrapped connection to a tdb database
+  to close just talloc_free() the tdb_wrap pointer
+ */
+struct tdb_wrap *tdb_wrap_open(TALLOC_CTX *mem_ctx,
+			       const char *name, int hash_size, int tdb_flags,
+			       int open_flags, mode_t mode)
+{
+	struct tdb_wrap *w;
+	struct tdb_logging_context log_ctx;
+
+	log_ctx.log_fn = log_fn;
+	log_ctx.log_private = NULL;
+
+	for (w=tdb_list;w;w=w->next) {
+		if (strcmp(name, w->name) == 0) {
+			return talloc_reference(mem_ctx, w);
+		}
+	}
+
+	w = talloc(mem_ctx, struct tdb_wrap);
+	if (w == NULL) {
+		return NULL;
+	}
+
+	w->name = talloc_strdup(w, name);
+	if (w->name == NULL) {
+		talloc_free(w);
+		return NULL;
+	}
+
+	w->tdb = tdb_open_ex(name, hash_size, tdb_flags, 
+			     open_flags, mode, &log_ctx, NULL);
+	if (w->tdb == NULL) {
+		talloc_free(w);
+		return NULL;
+	}
+
+	talloc_set_destructor(w, tdb_wrap_destructor);
+
+	DLIST_ADD(tdb_list, w);
+
+	return w;
+}