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1ebfc66b2c
Another preparation to convert secrets.c to dbwrap: The dbwrap API does not
provide a sane tdb_lock_with_timeout abstraction. In the clustered case the DC
mutex is needed per-node anyway, so it is perfectly fine to use a local mutex
only.
(This used to be commit f94a63cd8f)
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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Authenticate against a remote domain
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Copyright (C) Andrew Tridgell 1992-2002
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Copyright (C) Andrew Bartlett 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/* For reasons known only to MS, many of their NT/Win2k versions
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need serialised access only. Two connections at the same time
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may (in certain situations) cause connections to be reset,
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or access to be denied.
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This locking allows smbd's mutlithread architecture to look
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like the single-connection that NT makes. */
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struct named_mutex {
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struct tdb_wrap *tdb;
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char *name;
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};
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static int unlock_named_mutex(struct named_mutex *mutex)
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{
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tdb_unlock_bystring(mutex->tdb->tdb, mutex->name);
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return 0;
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}
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struct named_mutex *grab_named_mutex(TALLOC_CTX *mem_ctx, const char *name,
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int timeout)
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{
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struct named_mutex *result;
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result = talloc(mem_ctx, struct named_mutex);
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if (result == NULL) {
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DEBUG(0, ("talloc failed\n"));
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return NULL;
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}
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result->name = talloc_strdup(result, name);
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if (result->name == NULL) {
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DEBUG(0, ("talloc failed\n"));
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TALLOC_FREE(result);
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return NULL;
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}
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result->tdb = tdb_wrap_open(result, lock_path("mutex.tdb"), 0,
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TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
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if (result->tdb == NULL) {
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DEBUG(1, ("Could not open mutex.tdb: %s\n",
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strerror(errno)));
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TALLOC_FREE(result);
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return NULL;
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}
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if (tdb_lock_bystring_with_timeout(result->tdb->tdb, name,
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timeout) == -1) {
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DEBUG(1, ("Could not get the lock for %s\n", name));
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TALLOC_FREE(result);
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return NULL;
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}
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talloc_set_destructor(result, unlock_named_mutex);
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return result;
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}
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