Begin work on ios secure sockets

runtime/bin/platform_macos.cc

 // Copyright (c) 2012, the Dart 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 file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "bin/platform.h"
 
 #if !TARGET_OS_IOS
@@ skipping 58 matching lines @@
 }
 
 
 bool Platform::LocalHostname(char *buffer, intptr_t buffer_length) {
   return gethostname(buffer, buffer_length) == 0;
 }
 
 
 char** Platform::Environment(intptr_t* count) {
 #if TARGET_OS_IOS
-  // TODO(iposva): On Mac (desktop), _NSGetEnviron() is used to access the
-  // environ from shared libraries or bundles. This is present in crt_externs.h
-  // which is unavailable on iOS. On iOS, everything is statically linked for
-  // now. So arguably, accessing the environ directly with a "extern char
-  // **environ" will work. But this approach is brittle as the target with this
-  // CU could be a dynamic framework (introduced in iOS 8). A more elegant
-  // approach needs to be devised.
-  return NULL;
+  // TODO(zra,chinmaygarde): On iOS, environment variables are seldom used. Wire
+  // this up if someone needs it. In the meantime, we return an empty array.
+  char** result;
+  result = reinterpret_cast<char**>(Dart_ScopeAllocate(1 * sizeof(*result)));
+  if (result == NULL) {
+    return NULL;
+  }
+  result[0] = NULL;
+  *count = 0;
+  return result;
 #else
   // Using environ directly is only safe as long as we do not
   // provide access to modifying environment variables.
   // On MacOS you have to do a bit of magic to get to the
   // environment strings.
   char** environ = *(_NSGetEnviron());
   intptr_t i = 0;
   char** tmp = environ;
   while (*(tmp++) != NULL) {
     i++;
@@ skipping 27 matching lines @@
 
 
 void Platform::Exit(int exit_code) {
   exit(exit_code);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)