diff --git a/usr.bin/truss/extern.h b/usr.bin/truss/extern.h
--- a/usr.bin/truss/extern.h
+++ b/usr.bin/truss/extern.h
@@ -36,4 +36,4 @@
 extern void start_tracing(struct trussinfo *, pid_t);
 extern void restore_proc(int);
 extern void decode_siginfo(FILE *, siginfo_t *);
-extern void eventloop(struct trussinfo *);
+extern int eventloop(struct trussinfo *);
diff --git a/usr.bin/truss/main.c b/usr.bin/truss/main.c
--- a/usr.bin/truss/main.c
+++ b/usr.bin/truss/main.c
@@ -71,7 +71,7 @@
 	char **command;
 	const char *errstr;
 	pid_t pid;
-	int c;
+	int c, ret;
 
 	fname = NULL;
 
@@ -196,12 +196,12 @@
 	 */
 	clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
 
-	eventloop(trussinfo);
+	ret = eventloop(trussinfo);
 
 	if (trussinfo->flags & COUNTONLY)
 		print_summary(trussinfo);
 
 	fflush(trussinfo->outfile);
 
-	return (0);
+	return (ret);
 }
diff --git a/usr.bin/truss/setup.c b/usr.bin/truss/setup.c
--- a/usr.bin/truss/setup.c
+++ b/usr.bin/truss/setup.c
@@ -747,17 +747,18 @@
  * Wait for events until all the processes have exited or truss has been
  * asked to stop.
  */
-void
+int
 eventloop(struct trussinfo *info)
 {
 	struct ptrace_lwpinfo pl;
 	siginfo_t si;
-	int pending_signal;
+	int pending_signal, ret;
 
+	ret = 0;
 	while (!LIST_EMPTY(&info->proclist)) {
 		if (detaching) {
 			detach_all_procs(info);
-			return;
+			return (0);
 		}
 
 		if (waitid(P_ALL, 0, &si, WTRAPPED | WEXITED) == -1) {
@@ -777,6 +778,7 @@
 				if (si.si_code == CLD_EXITED)
 					thread_exit_syscall(info);
 				report_exit(info, &si);
+				ret = si.si_status;
 			}
 			free_proc(info->curthread->proc);
 			info->curthread = NULL;
@@ -829,4 +831,5 @@
 			break;
 		}
 	}
+	return (ret);
 }