D39623.diff
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	diff --git a/usr.bin/renice/renice.c b/usr.bin/renice/renice.c
	--- a/usr.bin/renice/renice.c
	+++ b/usr.bin/renice/renice.c
	@@ -94,7 +94,7 @@
	}
	if (strcmp(*argv, "-n") == 0) {
	/* may occur only once, prior to priority */
	- if (haveprio \|\| incr)
	+ if (haveprio \|\| incr \|\| argc < 2)
	usage();
	incr = true;
	(void)argc--, argv++;
	diff --git a/usr.bin/renice/tests/renice_test.sh b/usr.bin/renice/tests/renice_test.sh
	--- a/usr.bin/renice/tests/renice_test.sh
	+++ b/usr.bin/renice/tests/renice_test.sh
	@@ -158,6 +158,11 @@
	kill $pid
	}

	+atf_test_case renice_incr_noarg
	+renice_incr_noarg_body() {
	+ atf_check -o empty -e ignore -s exit:1 renice -n
	+}
	+
	atf_init_test_cases() {
	atf_add_test_case renice_abs_pid
	atf_add_test_case renice_rel_pid
	@@ -166,4 +171,5 @@
	atf_add_test_case renice_abs_user
	atf_add_test_case renice_rel_user
	atf_add_test_case renice_delim
	+ atf_add_test_case renice_incr_noarg
	}