sync code with last improvements from OpenBSD

app/xsm/lock.h

@@ -0,0 +1,39 @@
+/* $Xorg: lock.h,v 1.4 2001/02/09 02:06:01 xorgcvs Exp $ */
+/******************************************************************************
+
+Copyright 1994, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+******************************************************************************/
+/* $XFree86: xc/programs/xsm/lock.h,v 1.5 2001/08/01 00:45:07 tsi Exp $ */
+
+#ifndef _LOCK_H_
+#define _LOCK_H_
+
+#include <X11/Xdefs.h>
+
+extern Status LockSession(const char *session_name, Bool write_id);
+extern void UnlockSession(const char* session_name);
+extern char * GetLockId(const char *session_name);
+extern Bool CheckSessionLocked(const char *session_name, Bool get_id, char **id_ret);
+extern void UnableToLockSession(const char *session_name);
+
+#endif