kernel: _sys_getnull() (basically /dev/null)

1 files changed, 19 insertions, 0 deletions

diff --git a/src/cmd/tests/kernel/miscsyscall.c b/src/cmd/tests/kernel/miscsyscall.c
index 3cf3f2e..c7ce9e0 100644
--- a/src/cmd/tests/kernel/miscsyscall.c
+++ b/src/cmd/tests/kernel/miscsyscall.c
@@ -304,6 +304,24 @@ static void test_timer(void) {
 	}
 }
 
+static void test_getnull(void) {
+	hid_t h, h2;
+	char buf[16];
+	
+	test((h = _sys_getnull(0)) >= 0);
+	test((h2 = dup(h)));
+
+	test(_sys_read(h, buf, 16, 0) == -ENOSYS);
+	test(_sys_write(h, buf, 16, 0, 0) == -ENOSYS);
+	test(_sys_getsize(h) == -ENOSYS);
+	test(_sys_remove(h) == -ENOSYS);
+	test(_sys_fs_respond(h, buf, 16, 0) == -EBADF);
+	test(_sys_mount(h, "/asdf", 5) == -EGENERIC);
+
+	close(h);
+	close(h2);
+}
+
 void r_k_miscsyscall(void) {
 	run_test(test_await);
 	run_test(test_await2);
@@ -315,4 +333,5 @@ void r_k_miscsyscall(void) {
 	run_test(test_sleep);
 	run_test(test_badopen);
 	run_test(test_timer);
+	run_test(test_getnull);
 }