Port tests in udp_socket.cc to Fuchsia

Separate out a test in udp_socket.cc that depends on <linux/errqueue.h> so the
rest of the tests can run on Fuchsia.

PiperOrigin-RevId: 283322633

test/syscalls/linux/BUILD

@@ -3351,11 +3351,15 @@ cc_binary(
     ],
 )
 
-cc_binary(
-    name = "udp_socket_test",
+cc_library(
+    name = "udp_socket_test_cases",
     testonly = 1,
-    srcs = ["udp_socket.cc"],
-    linkstatic = 1,
+    srcs = [
+        "udp_socket_test_cases.cc",
+    ] + select_for_linux([
+        "udp_socket_errqueue_test_case.cc",
+    ]),
+    hdrs = ["udp_socket_test_cases.h"],
     deps = [
         ":socket_test_util",
         ":unix_domain_socket_test_util",
@@ -3366,6 +3370,17 @@ cc_binary(
         "@com_google_absl//absl/time",
         "@com_google_googletest//:gtest",
     ],
+    alwayslink = 1,
+)
+
+cc_binary(
+    name = "udp_socket_test",
+    testonly = 1,
+    srcs = ["udp_socket.cc"],
+    linkstatic = 1,
+    deps = [
+        ":udp_socket_test_cases",
+    ],
 )
 
 cc_binary(

test/syscalls/linux/udp_socket_errqueue_test_case.cc

@@ -0,0 +1,54 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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 "test/syscalls/linux/udp_socket_test_cases.h"
+
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <linux/errqueue.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "gtest/gtest.h"
+#include "absl/base/macros.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/syscalls/linux/unix_domain_socket_test_util.h"
+#include "test/util/test_util.h"
+#include "test/util/thread_util.h"
+
+namespace gvisor {
+namespace testing {
+
+TEST_P(UdpSocketTest, ErrorQueue) {
+  char cmsgbuf[CMSG_SPACE(sizeof(sock_extended_err))];
+  msghdr msg;
+  memset(&msg, 0, sizeof(msg));
+  iovec iov;
+  memset(&iov, 0, sizeof(iov));
+  msg.msg_iov = &iov;
+  msg.msg_iovlen = 1;
+  msg.msg_control = cmsgbuf;
+  msg.msg_controllen = sizeof(cmsgbuf);
+
+  // recv*(MSG_ERRQUEUE) never blocks, even without MSG_DONTWAIT.
+  EXPECT_THAT(RetryEINTR(recvmsg)(s_, &msg, MSG_ERRQUEUE),
+              SyscallFailsWithErrno(EAGAIN));
+}
+
+}  // namespace testing
+}  // namespace gvisor

test/syscalls/linux/udp_socket_test_cases.h

@@ -0,0 +1,74 @@
+// Copyright 2019 The gVisor Authors.
+//
+// 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.
+
+#ifndef THIRD_PARTY_GOLANG_GVISOR_TEST_SYSCALLS_LINUX_SOCKET_IPV4_UDP_UNBOUND_H_
+#define THIRD_PARTY_GOLANG_GVISOR_TEST_SYSCALLS_LINUX_SOCKET_IPV4_UDP_UNBOUND_H_
+
+#include "gtest/gtest.h"
+#include "test/syscalls/linux/socket_test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+// The initial port to be be used on gvisor.
+constexpr int TestPort = 40000;
+
+// Fixture for tests parameterized by the address family to use (AF_INET and
+// AF_INET6) when creating sockets.
+class UdpSocketTest
+    : public ::testing::TestWithParam<gvisor::testing::AddressFamily> {
+ protected:
+  // Creates two sockets that will be used by test cases.
+  void SetUp() override;
+
+  // Closes the sockets created by SetUp().
+  void TearDown() override {
+    EXPECT_THAT(close(s_), SyscallSucceeds());
+    EXPECT_THAT(close(t_), SyscallSucceeds());
+
+    for (size_t i = 0; i < ABSL_ARRAYSIZE(ports_); ++i) {
+      ASSERT_NO_ERRNO(FreeAvailablePort(ports_[i]));
+    }
+  }
+
+  // First UDP socket.
+  int s_;
+
+  // Second UDP socket.
+  int t_;
+
+  // The length of the socket address.
+  socklen_t addrlen_;
+
+  // Initialized address pointing to loopback and port TestPort+i.
+  struct sockaddr* addr_[3];
+
+  // Initialize "any" address.
+  struct sockaddr* anyaddr_;
+
+  // Used ports.
+  int ports_[3];
+
+ private:
+  // Storage for the loopback addresses.
+  struct sockaddr_storage addr_storage_[3];
+
+  // Storage for the "any" address.
+  struct sockaddr_storage anyaddr_storage_;
+};
+
+}  // namespace testing
+}  // namespace gvisor
+
+#endif  // THIRD_PARTY_GOLANG_GVISOR_TEST_SYSCALLS_LINUX_SOCKET_IPV4_UDP_UNBOUND_H_