Ever wonder on which platform Amazon AWS Lambda in C# is running?

In last December, AWS announced C# support for AWS Lambda using .NET Core 1.0 runtime. Ever wonder on which platform is it running? I am curious too and I did not see it in any official documentation. So I decided to write a small AWS Lambda function to detect the platform:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using Amazon.Lambda.Core;
using Amazon.Lambda.Serialization;
 
// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
[assembly: LambdaSerializerAttribute(typeof(Amazon.Lambda.Serialization.Json.JsonSerializer))]
 
namespace SysInfoLambda
{
    public class Function
    {
 
        /// <summary>
        /// A simple function that takes a string and does a ToUpper
        /// </summary>
        /// <param name="input"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        public RuntimeInfo FunctionHandler(ILambdaContext context)
        {
            return new RuntimeInfo()
            {
                FrameworkDescription = RuntimeInformation.FrameworkDescription,
                OSArchitecture = RuntimeInformation.OSArchitecture,
                ProcessArchitecture = RuntimeInformation.ProcessArchitecture,
                OSDescription = RuntimeInformation.OSDescription,
                OSPlatform = RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ? OS.Linux :
                    RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? OS.OSX : OS.Windows
            };
        }
 
    }
 
    public class RuntimeInfo
    {
        public string FrameworkDescription { get; set; }
        public Architecture OSArchitecture { get; set; }
        public string OSDescription { get; set; }
        public Architecture ProcessArchitecture { get; set; }
        public OS OSPlatform { get; set; }
    }
 
    public enum OS
    {
        Linux,
        OSX,
        Windows
    }
 
}

The result? The AWS C# Lambda runs in 64 bit Linux. The extract OS description is: Linux 4.4.35-33.55.amzn1.x86_64 #1 SMP Tue Dec 6 20:30:04 UTC 2016.