# HG changeset patch
# User Taylor R Campbell <riastradh@NetBSD.org>
# Date 1588091245 0
#      Tue Apr 28 16:27:25 2020 +0000
# Branch trunk
# Node ID e97f864210ce4fb3a39a1b09857e39cfeda7710c
# Parent  d96016ede9402999fd8aa1407c97f3d2e9f79833
Make FUTEX_WAIT_BITSET(bitset=0) fail with EINVAL to match Linux.

diff -r d96016ede940 -r e97f864210ce sys/kern/sys_futex.c
--- a/sys/kern/sys_futex.c	Tue Apr 28 15:59:02 2020 +0000
+++ b/sys/kern/sys_futex.c	Tue Apr 28 16:27:25 2020 +0000
@@ -1202,7 +1202,7 @@ futex_func_wait(bool shared, int *uaddr,
 	 * us, then don't set anything up to wait -- just stop here.
 	 */
 	if (val3 == 0)
-		return 0;
+		return EINVAL;
 
 	/* Optimistically test before anything else.  */
 	if (!futex_test(uaddr, val))
diff -r d96016ede940 -r e97f864210ce tests/lib/libc/sys/t_futex_ops.c
--- a/tests/lib/libc/sys/t_futex_ops.c	Tue Apr 28 15:59:02 2020 +0000
+++ b/tests/lib/libc/sys/t_futex_ops.c	Tue Apr 28 16:27:25 2020 +0000
@@ -632,9 +632,9 @@ ATF_TC_BODY(futex_wait_pointless_bitset,
 {
 
 	futex_word = 1;
-	/* This won't block because no bits are set. */
-	ATF_REQUIRE(__futex(&futex_word, FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG,
-			    1, NULL, NULL, 0, 0) == 0);
+	ATF_REQUIRE_ERRNO(EINVAL,
+	    __futex(&futex_word, FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG,
+		1, NULL, NULL, 0, 0) == -1);
 }
 
 static void