[dart:io] Adds Platform.operatingSystemVersion

runtime/bin/platform_fuchsia.cc

 // 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(HOST_OS_FUCHSIA)
 
 #include "bin/platform.h"
 
 #include <magenta/process.h>
 #include <magenta/status.h>
 #include <magenta/syscalls.h>
 #include <string.h>
+#include <sys/utsname.h>
 #include <unistd.h>
 
 #include "bin/dartutils.h"
 #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() {
   return true;
 }
 
 int Platform::NumberOfProcessors() {
   return sysconf(_SC_NPROCESSORS_CONF);
 }
 
 const char* Platform::OperatingSystem() {
   return "fuchsia";
 }
 
+const char* Platform::OperatingSystemVersion() {
+  struct utsname info;
+  int ret = uname(&info);
+  if (ret != 0) {
+    return NULL;
+  }
+  const char* kFormat = "%s %s %s";
+  int len =
+      snprintf(NULL, 0, kFormat, info.sysname, info.release, info.version);
+  if (len <= 0) {
+    return NULL;
+  }
+  char* result = DartUtils::ScopedCString(len + 1);
+  ASSERT(result != NULL);
+  len = snprintf(result, len + 1, kFormat, info.sysname, info.release,
+                 info.version);
+  if (len <= 0) {
+    return NULL;
+  }
+  return result;
+}
+
 const char* Platform::LibraryPrefix() {
   return "lib";
 }
 
 const char* Platform::LibraryExtension() {
   return "so";
 }
 
 const char* Platform::LocaleName() {
   char* lang = getenv("LANG");
@@ skipping 74 matching lines @@
 }
 
 void Platform::Exit(int exit_code) {
   exit(exit_code);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_FUCHSIA)