Add a cross ref to Optional Mode Line

[gnu-emacs] / src / filelock.c

diff --git a/src/filelock.c b/src/filelock.c
index 7f9b6e7f8e84b4c01420d67476dafdf11923cabc..8aaa656438d6c847eeb5c0e4ee21f6876cb1476f 100644 (file)
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -1,6 +1,6 @@
 /* Lock files for editing.
 
-Copyright (C) 1985-1987, 1993-1994, 1996, 1998-2015 Free Software
+Copyright (C) 1985-1987, 1993-1994, 1996, 1998-2016 Free Software
 Foundation, Inc.
 
 Author: Richard King
@@ -10,8 +10,8 @@ This file is part of GNU Emacs.
 
 GNU Emacs 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 3 of the License, or
-(at your option) any later version.
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -53,6 +53,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "w32.h"       /* for dostounix_filename */
 #endif
 
+#ifndef MSDOS
+
 #ifdef HAVE_UTMP_H
 #include <utmp.h>
 #endif
@@ -742,6 +744,19 @@ unlock_file (Lisp_Object fn)
   SAFE_FREE ();
 }
 
+#else  /* MSDOS */
+void
+lock_file (Lisp_Object fn)
+{
+}
+
+void
+unlock_file (Lisp_Object fn)
+{
+}
+
+#endif /* MSDOS */
+
 void
 unlock_all_files (void)
 {
@@ -805,6 +820,9 @@ The value is nil if the FILENAME is not locked,
 t if it is locked by you, else a string saying which user has locked it.  */)
   (Lisp_Object filename)
 {
+#ifdef MSDOS
+  return Qnil;
+#else
   Lisp_Object ret;
   char *lfname;
   int owner;
@@ -825,6 +843,7 @@ t if it is locked by you, else a string saying which user has locked it.  */)
 
   SAFE_FREE ();
   return ret;
+#endif
 }
 
 void