merge db wrap code from samba4

(This used to be ctdb commit 2f3c299c76ce463cd866dfb1900ff45928f32ba6)

diff --git a/ctdb/lib/util/db_wrap.c b/ctdb/lib/util/db_wrap.c
new file mode 100644 (file)
index 0000000..abf59c2
--- /dev/null
+++ b/ctdb/lib/util/db_wrap.c
@@ -0,0 +1,83 @@
+/* 
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+  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 "lib/events/events.h"
+#include "lib/tdb/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;
+}                               
+
+/*
+  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;
+
+       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);
+
+       w->tdb = tdb_open(name, hash_size, tdb_flags, 
+                         open_flags, mode);
+       if (w->tdb == NULL) {
+               talloc_free(w);
+               return NULL;
+       }
+
+       talloc_set_destructor(w, tdb_wrap_destructor);
+
+       DLIST_ADD(tdb_list, w);
+
+       return w;
+}

diff --git a/ctdb/lib/util/db_wrap.h b/ctdb/lib/util/db_wrap.h
new file mode 100644 (file)
index 0000000..3d04887
--- /dev/null
+++ b/ctdb/lib/util/db_wrap.h
@@ -0,0 +1,33 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   database wrap headers
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+
+struct tdb_wrap {
+       struct tdb_context *tdb;
+
+       const char *name;
+       struct tdb_wrap *next, *prev;
+};
+
+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);