--- ray/src/util/rttree_reduce.c	2013/10/03 03:36:11	2.8
+++ ray/src/util/rttree_reduce.c	2014/03/17 01:59:48	2.9
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rttree_reduce.c,v 2.8 2013/10/03 03:36:11 greg Exp $";
+static const char RCSid[] = "$Id: rttree_reduce.c,v 2.9 2014/03/17 01:59:48 greg Exp $";
 #endif
 /*
  *  A utility called by genBSDF.pl to reduce tensor tree samples and output
@@ -364,12 +364,15 @@ main(int argc, char *argv[])
 	if (i < argc-1)
 		goto userr;
 					/* load input data */
-	if (i == argc-1 && freopen(argv[i], "rb", stdin) == NULL) {
+	if (i == argc-1 && freopen(argv[i], "r", stdin) == NULL) {
 		sprintf(errmsg, "cannot open input file '%s'", argv[i]);
 		error(SYSTEM, errmsg);
 	}
 	if (infmt != 'a')
 		SET_FILE_BINARY(stdin);
+#ifdef getc_unlocked			/* avoid lock/unlock overhead */
+	flockfile(stdin);
+#endif
 	load_data();
 	if (recipavg)
 		do_reciprocity();