1 files changed, 53 insertions, 0 deletions
diff --git a/test/syscalls/linux/munmap.cc b/test/syscalls/linux/munmap.cc
new file mode 100644
index 000000000..e20039950
--- /dev/null
+++ b/test/syscalls/linux/munmap.cc
@@ -0,0 +1,53 @@
+// 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 <sys/mman.h>
+
+#include "gtest/gtest.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+class MunmapTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    m_ = mmap(nullptr, kPageSize, PROT_READ | PROT_WRITE,
+              MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    ASSERT_NE(MAP_FAILED, m_);
+  }
+
+  void* m_ = nullptr;
+};
+
+TEST_F(MunmapTest, HappyCase) {
+  EXPECT_THAT(munmap(m_, kPageSize), SyscallSucceeds());
+}
+
+TEST_F(MunmapTest, ZeroLength) {
+  EXPECT_THAT(munmap(m_, 0), SyscallFailsWithErrno(EINVAL));
+}
+
+TEST_F(MunmapTest, LastPageRoundUp) {
+  // Attempt to unmap up to and including the last page.
+  EXPECT_THAT(munmap(m_, static_cast<size_t>(-kPageSize + 1)),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor