1 files changed, 59 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc_net.cc b/test/syscalls/linux/proc_net.cc
new file mode 100644
index 000000000..6060d0644
--- /dev/null
+++ b/test/syscalls/linux/proc_net.cc
@@ -0,0 +1,59 @@
+// 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 "gtest/gtest.h"
+#include "gtest/gtest.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/fs_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+namespace {
+
+TEST(ProcNetIfInet6, Format) {
+  auto ifinet6 = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/if_inet6"));
+  EXPECT_THAT(ifinet6,
+              ::testing::MatchesRegex(
+                  // Ex: "00000000000000000000000000000001 01 80 10 80 lo\n"
+                  "^([a-f\\d]{32}( [a-f\\d]{2}){4} +[a-z][a-z\\d]*\\n)+$"));
+}
+
+TEST(ProcSysNetIpv4Sack, Exists) {
+  EXPECT_THAT(open("/proc/sys/net/ipv4/tcp_sack", O_RDONLY), SyscallSucceeds());
+}
+
+TEST(ProcSysNetIpv4Sack, CanReadAndWrite) {
+  auto const fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/sys/net/ipv4/tcp_sack", O_RDWR));
+
+  char buf;
+  EXPECT_THAT(PreadFd(fd.get(), &buf, sizeof(buf), 0),
+              SyscallSucceedsWithValue(sizeof(buf)));
+
+  EXPECT_TRUE(buf == '0' || buf == '1') << "unexpected tcp_sack: " << buf;
+
+  char to_write = (buf == '1') ? '0' : '1';
+  EXPECT_THAT(PwriteFd(fd.get(), &to_write, sizeof(to_write), 0),
+              SyscallSucceedsWithValue(sizeof(to_write)));
+
+  buf = 0;
+  EXPECT_THAT(PreadFd(fd.get(), &buf, sizeof(buf), 0),
+              SyscallSucceedsWithValue(sizeof(buf)));
+  EXPECT_EQ(buf, to_write);
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace gvisor