Revert "Extend the mDNS package with a native extension used on Mac OS"

src/pkg/mdns/mdns_extension_macos.cc

Index: src/pkg/mdns/mdns_extension_macos.cc
diff --git a/src/pkg/mdns/mdns_extension_macos.cc b/src/pkg/mdns/mdns_extension_macos.cc
deleted file mode 100644
index 8a9dbbd141a64a9207248e5e3f2600811676a2f1..0000000000000000000000000000000000000000
--- a/src/pkg/mdns/mdns_extension_macos.cc
+++ /dev/null
@@ -1,132 +0,0 @@
-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE.md file.
-
-#if defined(FLETCH_TARGET_OS_MACOS)
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <arpa/inet.h>
-#include <pthread.h>
-
-#include "include/dart_api.h"
-#include "include/dart_native_api.h"
-
-
-#include "/usr/include/dns_sd.h"
-
-#include "mdns_extension.h"
-
-// Context passed to the callback receiving the mDNS information.
-struct Context {
-  // The Dart port where the result should be delivered.
-  Dart_Port port;
-};
-
-// Print fatal error and exit.
-static void Fatal(const char *message) {
-  fprintf(stderr, "%s (errno %d)\n", message, errno);
-  exit(-1);
-}
-
-// Code running in the threads started for pumping the results.
-static void* ThreadFunction(void* data) {
-  DNSServiceRef ref = reinterpret_cast<DNSServiceRef>(data);
-
-  // Preocess results until an error occurs.
-  DNSServiceErrorType result = kDNSServiceErr_NoError;
-  while (result == kDNSServiceErr_NoError) {
-    result = DNSServiceProcessResult(ref);
-  }
-  // The expected error from deallocation the ref.
-  if (result != kDNSServiceErr_BadReference) {
-    fprintf(stderr, "Error from DNSServiceProcessResult: %d\n", result);
-  }
-
-  return NULL;
-}
-
-// Start a thread for receiving results from a specific DNSServiceRef.
-static int StartThread(DNSServiceRef ref) {
-  pthread_attr_t attr;
-  int result = pthread_attr_init(&attr);
-  if (result != 0) Fatal("Error from pthread_attr_init");
-
-  result = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-  if (result != 0) Fatal("Error from pthread_attr_setdetachstate");
-
-  pthread_t tid;
-  result = pthread_create(&tid, &attr, ThreadFunction, ref);
-  if (result != 0) Fatal("Error from pthread_create");
-
-  result = pthread_attr_destroy(&attr);
-  if (result != 0) Fatal("Error from pthread_attr_destroy");
-
-  return 0;
-}
-
-// Callback for results initiated by calling DNSServiceGetAddrInfo.
-static void GetAddrInfoCallback(DNSServiceRef ref,
-                                DNSServiceFlags flags,
-                                uint32_t interfaceIndex,
-                                DNSServiceErrorType errorCode,
-                                const char *hostname,
-                                const struct sockaddr *address,
-                                uint32_t ttl,
-                                void *context) {
-  if (address->sa_family == AF_INET) {
-    const struct sockaddr_in* address_in = (const struct sockaddr_in*)address;
-    const uint8_t* addr =
-        reinterpret_cast<const uint8_t*>(&address_in->sin_addr.s_addr);
-
-    struct Context* ctx = reinterpret_cast<struct Context*>(context);
-
-    // Build the response message.
-    Dart_CObject cobject_hostname;
-    cobject_hostname.type = Dart_CObject_kString;
-    cobject_hostname.value.as_string = const_cast<char*>(hostname);
-    Dart_CObject cobject_address;
-    cobject_address.type = Dart_CObject_kTypedData;
-    cobject_address.value.as_typed_data.length = 4;
-    cobject_address.value.as_typed_data.type = Dart_TypedData_kUint8;
-    cobject_address.value.as_typed_data.values = const_cast<uint8_t*>(addr);
-    Dart_CObject cobject_result;
-    cobject_result.type = Dart_CObject_kArray;
-    Dart_CObject* result_array[] = {&cobject_hostname, &cobject_address};
-    cobject_result.value.as_array.length = 2;
-    cobject_result.value.as_array.values = result_array;
-    Dart_PostCObject(ctx->port, &cobject_result);
-
-    // Result received, free allocated data and stop lookup.
-    free(ctx);
-    DNSServiceRefDeallocate(ref);
-  }
-}
-
-// Lookup request from Dart.
-void HandleLookup(Dart_Port port_id, char* hostname) {
-  DNSServiceRef ref;
-  DNSServiceErrorType result;
-  struct Context* context =
-      reinterpret_cast<struct Context*>(malloc(sizeof(struct Context)));
-  context->port = port_id;
-  result = DNSServiceGetAddrInfo(&ref,
-                                 0,
-                                 0,
-                                 kDNSServiceProtocol_IPv4,
-                                 hostname,
-                                 &GetAddrInfoCallback,
-                                 context);
-  if (result != kDNSServiceErr_NoError) {
-    fprintf(stderr, "Error from DNSServiceProcessResult: %d\n", result);
-  } else {
-    // Start a thread for retreiving the results.
-    // TODO(sgjesse): Add a timeout for killing the thread if there
-    // are no responses.
-    StartThread(ref);
-  }
-}
-
-#endif