recv() on a closed TCP socket returns ENOTCONN

From RFC 793 s3.9 p58 Event Processing:

If RECEIVE Call arrives in CLOSED state and the user has access to such a
connection, the return should be "error: connection does not exist"

Fixes #1598

PiperOrigin-RevId: 293494287

1 files changed, 9 insertions, 0 deletions

diff --git a/test/syscalls/linux/tcp_socket.cc b/test/syscalls/linux/tcp_socket.cc
index 525ccbd88..8a8b68e75 100644
--- a/test/syscalls/linux/tcp_socket.cc
+++ b/test/syscalls/linux/tcp_socket.cc
@@ -1339,6 +1339,15 @@ TEST_P(SimpleTcpSocketTest, SetTCPDeferAcceptGreaterThanZero) {
   EXPECT_EQ(get, kTCPDeferAccept);
 }
 
+TEST_P(SimpleTcpSocketTest, RecvOnClosedSocket) {
+  auto s =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(GetParam(), SOCK_STREAM, IPPROTO_TCP));
+  char buf[1];
+  EXPECT_THAT(recv(s.get(), buf, 0, 0), SyscallFailsWithErrno(ENOTCONN));
+  EXPECT_THAT(recv(s.get(), buf, sizeof(buf), 0),
+              SyscallFailsWithErrno(ENOTCONN));
+}
+
 INSTANTIATE_TEST_SUITE_P(AllInetTests, SimpleTcpSocketTest,
                          ::testing::Values(AF_INET, AF_INET6));