--- ray/src/util/rtcontrib.c	2005/06/17 16:07:18	1.24
+++ ray/src/util/rtcontrib.c	2005/09/20 17:05:11	1.27
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rtcontrib.c,v 1.24 2005/06/17 16:07:18 greg Exp $";
+static const char RCSid[] = "$Id: rtcontrib.c,v 1.27 2005/09/20 17:05:11 greg Exp $";
 #endif
 /*
  * Gather rtrace output to compute contributions from particular sources
@@ -173,6 +173,13 @@ main(int argc, char *argv[])
 	char	*binval = NULL;
 	char	fmt[8];
 	int	i, j;
+				/* need at least one argument */
+	if (argc < 2) {
+		fprintf(stderr,
+"Usage: %s [-n nprocs][-r][-e expr][-f source][-o ospec][-b binv] {-m mod | -M file} [rtrace options] octree\n",
+			argv[0]);
+		exit(1);
+	}
 				/* global program name */
 	gargv = argv;
 				/* initialize calcomp routines */
@@ -323,12 +330,15 @@ main(int argc, char *argv[])
 	quit(0);
 }
 
+#ifndef SIGALRM
+#define SIGALRM SIGTERM
+#endif
 /* kill persistent rtrace process */
 static void
 killpersist(void)
 {
 	FILE	*fp = fopen(persistfn, "r");
-	int	pid;
+	RT_PID	pid;
 
 	if (fp == NULL)
 		return;
@@ -706,7 +716,7 @@ add_contrib(const char *modn)
 	bn = (int)(evalue(mp->binv) + .5);
 	if (bn <= 0)
 		bn = 0;
-	else if (bn > mp->nbins) {	/* new bin */
+	else if (bn >= mp->nbins) {	/* new bin */
 		mp = (MODCONT *)realloc(mp, sizeof(MODCONT) +
 						bn*sizeof(DCOLOR));
 		if (mp == NULL)