Get more specific OS name (#54)

src/SkyWalking.Core/Remote/GrpcApplicationService.cs

@@ -30,6 +30,7 @@ using SkyWalking.Context;
 using SkyWalking.Dictionarys;
 using SkyWalking.Logging;
 using SkyWalking.NetworkProtocol;
+using SkyWalking.Utils;
 
 namespace SkyWalking.Remote
 {
@@ -121,7 +122,7 @@ namespace SkyWalking.Remote
                 var osInfo = new OSInfo
                 {
                     Hostname = hostName,
-                    OsName = Environment.OSVersion.ToString(),
+                    OsName = PlatformInformation.GetOSName(),
                     ProcessNo = Process.GetCurrentProcess().Id
                 };
 

src/SkyWalking.Core/Utils/PlatformInformation.cs

+using System.Runtime.InteropServices;
+
+namespace SkyWalking.Utils
+{
+    internal static class PlatformInformation
+    {
+        private const string OSX = "Mac OS X";
+        private const string LINUX = "Linux";
+        private const string WINDOWS = "Windows";
+
+        public static string GetOSName()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return WINDOWS;
+            }
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                return LINUX;
+            }
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                return OSX;
+            }
+
+            return "Unknow";
+        }
+    }
+}