Open source system call tests.

PiperOrigin-RevId: 224886231
Change-Id: I0fccb4d994601739d8b16b1d4e6b31f40297fb22

1 files changed, 44 insertions, 0 deletions

diff --git a/test/syscalls/linux/vsyscall.cc b/test/syscalls/linux/vsyscall.cc
new file mode 100644
index 000000000..cb6840cc6
--- /dev/null
+++ b/test/syscalls/linux/vsyscall.cc
@@ -0,0 +1,44 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <errno.h>
+#include <time.h>
+
+#include "gtest/gtest.h"
+#include "test/util/proc_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+time_t vsyscall_time(time_t* t) {
+  constexpr uint64_t kVsyscallTimeEntry = 0xffffffffff600400;
+  return reinterpret_cast<time_t (*)(time_t*)>(kVsyscallTimeEntry)(t);
+}
+
+TEST(VsyscallTest, VsyscallAlwaysAvailableOnGvisor) {
+  SKIP_IF(!IsRunningOnGvisor());
+  // Vsyscall is always advertised by gvisor.
+  EXPECT_TRUE(ASSERT_NO_ERRNO_AND_VALUE(IsVsyscallEnabled()));
+  // Vsyscall should always works on gvisor.
+  time_t t;
+  EXPECT_THAT(vsyscall_time(&t), SyscallSucceeds());
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor