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merge db wrap code from samba4

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(This used to be ctdb commit 2f3c299c76ce463cd866dfb1900ff45928f32ba6)
This commit is contained in:
Andrew Tridgell 2007-01-25 15:11:36 +11:00
parent e1797cf6be
commit e90f9aa084
2 changed files with 116 additions and 0 deletions
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83
ctdb/lib/util/db_wrap.c Normal file
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/*
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;
}

33
ctdb/lib/util/db_wrap.h Normal file
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/*
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);