.

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   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, 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 "pop3d.h"
+
+int
+pop3d_lock ()
+{
+  url_t url = NULL;
+  locker_t lock = NULL;
+  const char *name;
+
+  mailbox_get_url (mbox, &url);
+  name = url_to_string (url);
+  mailbox_get_locker (mbox, &lock);
+  if (locker_lock (lock, MU_LOCKER_WRLOCK))
+    {
+      syslog (LOG_NOTICE, "mailbox '%s' locked by another session",
+	      (name) ? name : "?");
+      return ERR_MBOX_LOCK;
+    }
+  return 0;
+}
+
+int
+pop3d_touchlock ()
+{
+  locker_t lock = NULL;
+  mailbox_get_locker (mbox, &lock);
+  locker_touchlock (lock);
+  return 0;
+}
+
+int
+pop3d_unlock ()
+{
+  locker_t lock = NULL;
+  mailbox_get_locker (mbox, &lock);
+  locker_unlock (lock);
+  return 0;
+}