Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs

Index: third_party/grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs
diff --git a/third_party/grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs b/third_party/grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs
new file mode 100644
index 0000000000000000000000000000000000000000..fb1acfb607b23925900c2d211746fa0bed32e365
--- /dev/null
+++ b/third_party/grpc/src/csharp/Grpc.Core/Internal/PlatformApis.cs
@@ -0,0 +1,123 @@
+#region Copyright notice and license
+
+// Copyright 2015-2016, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// Utility methods for detecting platform and architecture.
+    /// </summary>
+    internal static class PlatformApis
+    {
+        static readonly bool isLinux;
+        static readonly bool isMacOSX;
+        static readonly bool isWindows;
+        static readonly bool isMono;
+
+        static PlatformApis()
+        {
+#if DNXCORE50
+            isLinux = RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
+            isMacOSX = RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
+            isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+#else
+            var platform = Environment.OSVersion.Platform;
+
+            // PlatformID.MacOSX is never returned, commonly used trick is to identify Mac is by using uname.
+            isMacOSX = (platform == PlatformID.Unix && GetUname() == "Darwin");
+            isLinux = (platform == PlatformID.Unix && !isMacOSX);
+            isWindows = (platform == PlatformID.Win32NT || platform == PlatformID.Win32S || platform == PlatformID.Win32Windows);
+#endif
+            isMono = Type.GetType("Mono.Runtime") != null;
+        }
+
+        public static bool IsLinux
+        {
+            get { return isLinux; }
+        }
+
+        public static bool IsMacOSX
+        {
+            get { return isMacOSX; }
+        }
+
+        public static bool IsWindows
+        {
+            get { return isWindows; }
+        }
+
+        public static bool IsMono
+        {
+            get { return isMono; }
+        }
+
+        public static bool Is64Bit
+        {
+            get { return IntPtr.Size == 8; }
+        }
+
+        [DllImport("libc")]
+        static extern int uname(IntPtr buf);
+
+        static string GetUname()
+        {
+            var buffer = Marshal.AllocHGlobal(8192);
+            try
+            {
+                if (uname(buffer) == 0)
+                {
+                    return Marshal.PtrToStringAnsi(buffer);
+                }
+                return string.Empty;
+            }
+            catch
+            {
+                return string.Empty;
+            }
+            finally
+            {
+                if (buffer != IntPtr.Zero)
+                {
+                    Marshal.FreeHGlobal(buffer);
+                }
+            }
+        }
+    }
+}