source3/lib/server_mutex.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authenticate against a remote domain
   4    Copyright (C) Andrew Tridgell 1992-2002
   5    Copyright (C) Andrew Bartlett 2002
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /* For reasons known only to MS, many of their NT/Win2k versions
  25    need serialised access only.  Two connections at the same time
  26    may (in certain situations) cause connections to be reset,
  27    or access to be denied.
  28
  29    This locking allows smbd's mutlithread architecture to look
  30    like the single-connection that NT makes. */
  31
  32 static char *mutex_server_name;
  33
  34 BOOL grab_server_mutex(const char *name)
  35 {
  36         mutex_server_name = SMB_STRDUP(name);
  37         if (!mutex_server_name) {
  38                 DEBUG(0,("grab_server_mutex: malloc failed for %s\n", name));
  39                 return False;
  40         }
  41         if (!secrets_named_mutex(mutex_server_name, 10)) {
  42                 DEBUG(10,("grab_server_mutex: failed for %s\n", name));
  43                 SAFE_FREE(mutex_server_name);
  44                 return False;
  45         }
  46
  47         return True;
  48 }
  49
  50 void release_server_mutex(void)
  51 {
  52         if (mutex_server_name) {
  53                 secrets_named_mutex_release(mutex_server_name);
  54                 SAFE_FREE(mutex_server_name);
  55         }
  56 }