unblock Unix Domain Socket on Dispose on macOS (#101753)

* unblock Unix Domain Socket on dispose on macOS

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Author: wfurt

Diff for: src/libraries/System.Net.Sockets/tests/FunctionalTests/UnixDomainSocketTest.cs

@@ -586,6 +586,56 @@ public async Task ReceiveFrom_EndPoints_Correct(bool useAsync)
             }
         }
 
+        [ConditionalFact(typeof(Socket), nameof(Socket.OSSupportsUnixDomainSockets))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/52124", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
+        public async Task UnixDomainSocket_Receive_GetsCanceledByDispose()
+        {
+            string path = GetRandomNonExistingFilePath();
+            var endPoint = new UnixDomainSocketEndPoint(path);
+
+            using (var server = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified))
+            using (var client = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified))
+            {
+                server.Bind(endPoint);
+                server.Listen(1);
+
+                client.Connect(endPoint);
+                int msDelay = 100;
+                bool readFailed = false;
+                byte[] buffer = new byte[100];
+                using (Socket accepted = server.Accept())
+                {
+                    while (msDelay < 10_000)
+                    {
+                        Task disposeTask = Task.Run(() =>
+                        {
+                            Thread.Sleep(msDelay);
+                            client.Dispose();
+                        });
+
+                        try
+                        {
+                            client.Receive(buffer);
+                        }
+                        catch (SocketException)
+                        {
+                            await disposeTask;
+                            readFailed = true;
+                            break;
+                        }
+                        catch (ObjectDisposedException)
+                        {
+                            await disposeTask;
+                            // Dispose happened before the operation, retry.
+                            msDelay *= 2;
+                            continue;
+                        }
+                    }
+                }
+                Assert.True(readFailed);
+            }
+        }
+
         private static string GetRandomNonExistingFilePath()
         {
             string result;

Diff for: src/native/libs/System.Native/pal_networking.c

@@ -3143,6 +3143,11 @@ int32_t SystemNative_Disconnect(intptr_t socket)
 #elif HAVE_DISCONNECTX
     // disconnectx causes a FIN close on OSX. It's the best we can do.
     err = disconnectx(fd, SAE_ASSOCID_ANY, SAE_CONNID_ANY);
+    if (err != 0)
+    {
+        // This happens on Unix Domain Sockets as disconnectx is only supported on AF_INET and AF_INET6
+        err = shutdown(fd, SHUT_RDWR);
+    }
 #else
     // best-effort, this may cause a FIN close.
     err = shutdown(fd, SHUT_RDWR);