Fuchsia: Build standalone VM. Make it run "Hello, World!".

runtime/bin/platform_fuchsia.cc

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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_ANDROID)
+#if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/platform.h"
 
-#include <signal.h>  // NOLINT
+#include <runtime/sysinfo.h>
 #include <string.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 
 #include "bin/fdutils.h"
 #include "bin/file.h"
 
 namespace dart {
 namespace bin {
 
 const char* Platform::executable_name_ = NULL;
 char* Platform::resolved_executable_name_ = NULL;
 int Platform::script_index_ = 1;
 char** Platform::argv_ = NULL;
 
 bool Platform::Initialize() {
-  // Turn off the signal handler for SIGPIPE as it causes the process
-  // to terminate on writing to a closed pipe. Without the signal
-  // handler error EPIPE is set instead.
-  struct sigaction act;
-  bzero(&act, sizeof(act));
-  act.sa_handler = SIG_IGN;
-  if (sigaction(SIGPIPE, &act, 0) != 0) {
-    perror("Setting signal handler failed");
-    return false;
-  }
   return true;
 }
 
 
 int Platform::NumberOfProcessors() {
-  return sysconf(_SC_NPROCESSORS_ONLN);
+  return mxr_get_nprocs();
 }
 
 
 const char* Platform::OperatingSystem() {
-  return "android";
+  return "fuchsia";
 }
 
 
 const char* Platform::LibraryPrefix() {
   return "lib";
 }
 
 
 const char* Platform::LibraryExtension() {
   return "so";
 }
 
 
 bool Platform::LocalHostname(char *buffer, intptr_t buffer_length) {
   return gethostname(buffer, buffer_length) == 0;
 }
 
 
 char** Platform::Environment(intptr_t* count) {
-  // Using environ directly is only safe as long as we do not
-  // provide access to modifying environment variables.
-  intptr_t i = 0;
-  char** tmp = environ;
-  while (*(tmp++) != NULL) {
-    i++;
-  }
-  *count = i;
-  char** result;
-  result = reinterpret_cast<char**>(Dart_ScopeAllocate(i * sizeof(*result)));
-  for (intptr_t current = 0; current < i; current++) {
-    result[current] = environ[current];
-  }
+  char** result =
+      reinterpret_cast<char**>(Dart_ScopeAllocate(1 * sizeof(*result)));
+  result[0] = NULL;
   return result;
 }
 
 
 const char* Platform::ResolveExecutablePath() {
-  return NULL;
+  return "dart";
 }
 
 
 void Platform::Exit(int exit_code) {
   exit(exit_code);
 }
 
 }  // namespace bin
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_ANDROID)
+#endif  // defined(TARGET_OS_FUCHSIA)