//
// System.Platform
//
// Copyright (C) 2011-2013 Xamarin Inc. (www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Runtime.InteropServices;

namespace System {
	internal static class Platform {
#if MONOTOUCH
		public static bool IsMacOS {
			get { return true; }
		}
#else
		[DllImport ("libc")]
		static extern int uname (IntPtr buf);
		
		static bool checkedIsMacOS;
		static bool isMacOS;
		
		public static bool IsMacOS {
			get {
				if (Environment.OSVersion.Platform != PlatformID.Unix)
					return false;

				if (!checkedIsMacOS) {
					IntPtr buf = Marshal.AllocHGlobal (8192);
					if (uname (buf) == 0) {
						string os = Marshal.PtrToStringAnsi (buf);
						if (os == "Darwin")
							isMacOS = true;
					}
					Marshal.FreeHGlobal (buf);
					checkedIsMacOS = true;
				}
				
				return isMacOS;
			}
		}
#endif
	}
}