Initial import

[samba] / source / lib / server_mutex.c

diff --git a/source/lib/server_mutex.c b/source/lib/server_mutex.c
new file mode 100644 (file)
index 0000000..2267fba
--- /dev/null
+++ b/source/lib/server_mutex.c
@@ -0,0 +1,56 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Authenticate against a remote domain
+   Copyright (C) Andrew Tridgell 1992-2002
+   Copyright (C) Andrew Bartlett 2002
+   
+   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.
+*/
+
+#include "includes.h"
+
+/* For reasons known only to MS, many of their NT/Win2k versions
+   need serialised access only.  Two connections at the same time
+   may (in certain situations) cause connections to be reset,
+   or access to be denied.
+
+   This locking allows smbd's mutlithread architecture to look
+   like the single-connection that NT makes. */
+
+static char *mutex_server_name;
+
+BOOL grab_server_mutex(const char *name)
+{
+       mutex_server_name = SMB_STRDUP(name);
+       if (!mutex_server_name) {
+               DEBUG(0,("grab_server_mutex: malloc failed for %s\n", name));
+               return False;
+       }
+       if (!secrets_named_mutex(mutex_server_name, 10)) {
+               DEBUG(10,("grab_server_mutex: failed for %s\n", name));
+               SAFE_FREE(mutex_server_name);
+               return False;
+       }
+
+       return True;
+}
+
+void release_server_mutex(void)
+{
+       if (mutex_server_name) {
+               secrets_named_mutex_release(mutex_server_name);
+               SAFE_FREE(mutex_server_name);
+       }
+}