Index: trunk/include/slib.h
===================================================================
--- trunk/include/slib.h	(revision 211)
+++ trunk/include/slib.h	(revision 212)
@@ -355,4 +355,8 @@
   sh_string * sl_get_content (SL_TICKET ticket);
 
+  /* Lock file (uses fcntl F_SETLK).
+   */
+  int sl_lock (SL_TICKET ticket);
+
   /* Close file.
    */