kernel: implement /dev/bintime

1 files changed, 49 insertions, 0 deletions

diff --git a/src/cmd/tests/kernel/time.c b/src/cmd/tests/kernel/time.c
new file mode 100644
index 0000000..476a90a
--- /dev/null
+++ b/src/cmd/tests/kernel/time.c
@@ -0,0 +1,49 @@
+#include "../tests.h"
+#include <camellia.h>
+
+static void
+test_settime(void) {
+	uint64_t ns = 1000000000;
+	uint64_t base = 1337 * ns;
+	union {
+		uint64_t t;
+		char buf[8];
+	} u;
+
+	hid_t h = camellia_open("/dev/bintime", OPEN_RW);
+
+	/* check if time is reasonable */
+	test(h >= 0);
+	test(_sys_read(h, u.buf, 8, 0) == 8);
+	test(0 < u.t);
+	test(u.t < ns); /* this should've taken less than a second */
+
+	/* try changing the time */
+	u.t = base;
+	test(_sys_write(h, u.buf, 8, 0, 0) == 8);
+
+	/* did we succeed? */
+	u.t = 0;
+	test(_sys_read(h, u.buf, 8, 0) == 8);
+	test(base < u.t);
+	test(u.t < base + ns);
+
+	/* clone the handle */
+	hid_t h2 = _sys_dup(h, 0, DUP_SEARCH | DUP_RDONLY);
+	test(h2 >= 0);
+
+	/* i shouldn't be able to write to it */
+	u.t = 0;
+	test(_sys_write(h2, u.buf, 8, 0, 0) == -EACCES);
+
+	/* but reads should be fine */
+	test(_sys_read(h2, u.buf, 8, 0) == 8);
+	test(base < u.t);
+	test(u.t < base + ns);
+}
+
+void
+r_k_time(void)
+{
+	run_test(test_settime);
+}