ok?

? ktrace.out
Index: calendar.c
===================================================================
RCS file: /cvs/src/usr.bin/calendar/calendar.c,v
diff -u -p -r1.39 calendar.c
--- calendar.c	18 Feb 2026 21:40:55 -0000	1.39
+++ calendar.c	16 Mar 2026 15:17:08 -0000
@@ -128,6 +128,8 @@ main(int argc, char *argv[])
 	if (doall) {
 		if (unveil("/tmp", "rwc") == -1)
 			err(1, "unveil /tmp");
+		if (unveil("/dev/null", "rw") == -1)
+			err(1, "unveil /dev/null");
 		if (unveil("/", "r") == -1)
 			err(1, "unveil /");
 		if (pledge("stdio rpath wpath cpath fattr getpw id proc exec",