first pass at the database code for Samba. This also includes a test

suite and a very simple tool for manuipulating the databases.

the main code is in tdb/tdb.c and includes both mmap and file based
IO. All databases auto-expand and allow multiple simultaneous writers.

the next step is using this new capability in lots of places in Samba
where we have existing ad-hoc databases
(This used to be commit c89d29cc5e3b6d568928acace01144059f1668b3)

1 files changed, 61 insertions, 0 deletions

diff --git a/source3/tdb/tdb.h b/source3/tdb/tdb.h
new file mode 100644
index 0000000000..316338606b
--- /dev/null
+++ b/source3/tdb/tdb.h
@@ -0,0 +1,61 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   Samba database functions
+   Copyright (C) Andrew Tridgell 1999
+   
+   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.
+*/
+
+typedef unsigned tdb_len;
+typedef unsigned tdb_off;
+
+/* this is stored at the front of every database */
+struct tdb_header {
+	unsigned version; /* version of the code */
+	unsigned hash_size; /* number of hash entries */
+};
+
+typedef struct {
+	char *dptr;
+	size_t dsize;
+} TDB_DATA;
+
+/* this is the context structure that is returned from a db open */
+typedef struct {
+	char *name; /* the name of the database */
+	void *map_ptr; /* where it is currently mapped */
+	int fd; /* open file descriptor for the database */
+	tdb_len map_size; /* how much space has been mapped */
+	int write_locked; /* set if we have the db locked */
+	struct tdb_header header; /* a cached copy of the header */
+} TDB_CONTEXT;
+
+#define TDB_REPLACE 1
+#define TDB_INSERT 2
+
+#if STANDALONE
+int tdb_writelock(TDB_CONTEXT *tdb);
+int tdb_writeunlock(TDB_CONTEXT *tdb);
+TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
+int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
+int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
+TDB_CONTEXT *tdb_open(char *name, int hash_size, int flags, mode_t mode);
+int tdb_close(TDB_CONTEXT *tdb);
+TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
+TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
+int tdb_traverse(TDB_CONTEXT *tdb, int (*fn)(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf));
+int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
+#endif