Fix TCP_LINGER2 behavior to match linux.

We still deviate a bit from linux in how long we will actually wait in
FIN-WAIT-2. Linux seems to cap it with TIME_WAIT_LEN and it's not completely
obvious as to why it's done that way. For now I think we can ignore that and
fix it if it really is an issue.

PiperOrigin-RevId: 328324922

1 files changed, 25 insertions, 6 deletions

diff --git a/test/syscalls/linux/socket_ip_tcp_generic.cc b/test/syscalls/linux/socket_ip_tcp_generic.cc
index 53c076787..04356b780 100644
--- a/test/syscalls/linux/socket_ip_tcp_generic.cc
+++ b/test/syscalls/linux/socket_ip_tcp_generic.cc
@@ -819,18 +819,37 @@ TEST_P(TCPSocketPairTest, TCPLingerTimeoutDefault) {
   EXPECT_EQ(get, kDefaultTCPLingerTimeout);
 }
 
-TEST_P(TCPSocketPairTest, SetTCPLingerTimeoutZeroOrLess) {
+TEST_P(TCPSocketPairTest, SetTCPLingerTimeoutLessThanZero) {
   auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
 
-  constexpr int kZero = 0;
-  EXPECT_THAT(setsockopt(sockets->first_fd(), IPPROTO_TCP, TCP_LINGER2, &kZero,
-                         sizeof(kZero)),
-              SyscallSucceedsWithValue(0));
-
   constexpr int kNegative = -1234;
   EXPECT_THAT(setsockopt(sockets->first_fd(), IPPROTO_TCP, TCP_LINGER2,
                          &kNegative, sizeof(kNegative)),
               SyscallSucceedsWithValue(0));
+  int get = INT_MAX;
+  socklen_t get_len = sizeof(get);
+  EXPECT_THAT(
+      getsockopt(sockets->first_fd(), IPPROTO_TCP, TCP_LINGER2, &get, &get_len),
+      SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get_len, sizeof(get));
+  EXPECT_EQ(get, -1);
+}
+
+TEST_P(TCPSocketPairTest, SetTCPLingerTimeoutZero) {
+  auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
+
+  constexpr int kZero = 0;
+  EXPECT_THAT(setsockopt(sockets->first_fd(), IPPROTO_TCP, TCP_LINGER2, &kZero,
+                         sizeof(kZero)),
+              SyscallSucceedsWithValue(0));
+  int get = -1;
+  socklen_t get_len = sizeof(get);
+  EXPECT_THAT(
+      getsockopt(sockets->first_fd(), IPPROTO_TCP, TCP_LINGER2, &get, &get_len),
+      SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get_len, sizeof(get));
+  EXPECT_THAT(get,
+              AnyOf(Eq(kMaxTCPLingerTimeout), Eq(kOldMaxTCPLingerTimeout)));
 }
 
 TEST_P(TCPSocketPairTest, SetTCPLingerTimeoutAboveMax) {