Syslog.cs

using System;
using System.Runtime.InteropServices;

namespace Jitbit.Utils
{
	public class Syslog
	{
		[Flags]
		private enum Option
		{
			Pid = 0x01,
			Console = 0x02,
			Delay = 0x04,
			NoDelay = 0x08,
			NoWait = 0x10,
			PrintError = 0x20
		}

		[Flags]
		private enum Facility
		{
			User = 1 << 3, //removed other unused enum values for brevity
		}

		[Flags]
		public enum Level
		{
			Emerg = 0,
			Alert = 1,
			Crit = 2,
			Err = 3,
			Warning = 4,
			Notice = 5,
			Info = 6,
			Debug = 7
		}

		[DllImport("libc")]
		private static extern void openlog(IntPtr ident, Option option, Facility facility);

		[DllImport("libc")]
		private static extern void syslog(int priority, string message);

		[DllImport("libc")]
		private static extern void closelog();

		public static void Write(Syslog.Level level, string identity, string message)
		{
			//are we on linux?
			if (!OperatingSystem.IsLinux()) return;

			//validate input
			if (string.IsNullOrWhiteSpace(message) && string.IsNullOrWhiteSpace(identity)) return;

			IntPtr ident = Marshal.StringToHGlobalAnsi(identity);
			openlog(ident, Option.Console | Option.Pid | Option.PrintError, Facility.User);

			//split multiline messages, otherwise we end up with "line1 #012 line2 #012 line3" etc
			foreach (var line in message.Split('\n', StringSplitOptions.RemoveEmptyEntries))
			{
				syslog((int)Facility.User | (int)level, line.Trim());
			}
			
			closelog();
			Marshal.FreeHGlobal(ident);
		}
	}
}