Refactor syscall tests

- Move shared helpers V4Multicast and V4Broadcast to socket_test_util
- Add unnamed namespace so socket_ipv4_tcp_unbound_external_networking_test.cc
  and socket_ipv4_udp_unbound_external_networking_test.cc can be compiled
  together
- Add test files to "exports_files" so they can be included by Fuchsia's syscall
  test setup

PiperOrigin-RevId: 293880429

1 files changed, 5 insertions, 0 deletions

diff --git a/test/syscalls/linux/socket_test_util.h b/test/syscalls/linux/socket_test_util.h
index bfaa6e397..734b48b96 100644
--- a/test/syscalls/linux/socket_test_util.h
+++ b/test/syscalls/linux/socket_test_util.h
@@ -484,10 +484,15 @@ struct TestAddress {
       : description(std::move(description)), addr(), addr_len() {}
 };
 
+constexpr char kMulticastAddress[] = "224.0.2.1";
+constexpr char kBroadcastAddress[] = "255.255.255.255";
+
 TestAddress V4Any();
+TestAddress V4Broadcast();
 TestAddress V4Loopback();
 TestAddress V4MappedAny();
 TestAddress V4MappedLoopback();
+TestAddress V4Multicast();
 TestAddress V6Any();
 TestAddress V6Loopback();