Index: src/cmp.c
===================================================================
RCS file: /sources/diffutils/diffutils/src/cmp.c,v
retrieving revision 1.47
diff -u -r1.47 cmp.c
--- src/cmp.c	19 Jul 2007 17:45:28 -0000	1.47
+++ src/cmp.c	11 Apr 2009 11:56:21 -0000
@@ -284,7 +284,11 @@
 	{
 	  file_desc[f1] = STDIN_FILENO;
 	  if (O_BINARY && ! isatty (STDIN_FILENO))
-	    freopen (NULL, "rb", stdin);
+	  {
+	    /* Try to change stdin to binary mode */
+	    if (!freopen (NULL, "rb", stdin))
+		    error (EXIT_TROUBLE, errno, "%s", _("standard input"));
+	  }
 	}
       else
 	file_desc[f1] = open (file[f1], O_RDONLY | O_BINARY, 0);