[Mono-dev] Writing a cross platform daemon in C#

[Charlie Poole]

Hi,

For Windows services, I usually put everything into a dll and then
write too exe shells - a service for production use and a console
app for use in testing and debugging. Of course, most of my 
unit tests just use the dll.

I don't have anything for you on the cross-platform part, but I'll
be interested to see what you come up with.

Charlie

> -----Original Message-----
> From: mono-devel-list-bounces at lists.ximian.com 
> [mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf 
> Of mabra at manfbraun.de
> Sent: Saturday, January 09, 2010 12:23 PM
> To: mono-devel-list at lists.ximian.com
> Subject: Re: [Mono-dev] Writing a cross platform daemon in C#
> 
> Hi !
> 
> For the windows-part, write a service [which derives from 
> ServiceBase]. To make the source running in both worlds, mono 
> must implement this and I think [hope?], this is the case. To 
> make a windows service running as a console app - and so, it 
> should run under linux - use this main method:
> 
> public static void Main(string[] args) //(Regard breaks, use 
> full width) {
> 	Service service = new Service();
> 
> 	if(Environment.UserInteractive)
> 	{
> 		//Attach a control-c handler for the console to 
> allow the app to notify about exit.
> 
> 		service.consoleControl = new ConsoleControl();
> 		ConsoleControl.ControlEventHandler controlEventHandler =
> 				new
> ConsoleControl.ControlEventHandler(service.ConsoleControlHandler);
> 		service.consoleControl.ControlEvent += 
> controlEventHandler;
> 		service.exitSignal = new ManualResetEvent(false);
> 
> 
> 		service.OnStart(args);	//For interactive use, call the
> services "OnStart()" "manually" ...
> 
> 		//Wait for the control-c handler for the 
> console to allow the app to notify about exit.
> 
> 		service.WaitForExit();	//Do not do, how to 
> make this under
> (lin)(u)nix ;-)
> 
> 		service.OnStop();
> 	}
> 	else
> 	{
> 		System.ServiceProcess.ServiceBase.Run(service);
> 	}
> }
> 
> I do not know - under linux - how the end signal is finally received.
> I use the obove to make minimal tests for services under windows.
> 
> Hope, this helps.
> 
> br--mabra
> 
> 
> -----Original Message-----
> From: mono-devel-list-bounces at lists.ximian.com
> [mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf 
> Of Miguel de Icaza
> Sent: Friday, January 08, 2010 9:57 PM
> To: paul at all-the-johnsons.co.uk
> Cc: mono-devel
> Subject: Re: [Mono-dev] Writing a cross platform daemon in C#
> 
> Hello,
> 
> > Does anyone have any examples of (or can point me to easy to 
> > understand examples of) daemons in C# and port monitoring in C#?
> 
> A daemon is merely a program that is not connected to a terminal or a
> GUI.   All you need to do to launch a program as a daemon is to launch
> it in the background either from a startup script on your 
> system, or by calling Mono like this:
> 
> 	nohup mono program.exe &
> 
> Since daemons typically can not reliably log data to 
> stdout/stderr, they tend to write their data using syslog so 
> the data ends up in a system managed log, or even better, 
> they dump the data in a well known location, like this:
> 
> 	nohup mono daemon.exe /home/logs/mylogs &
> 
> Or you can dump the data in a database (this might be a better idea).
> 
> Additionally, daemons ideally can be controlled remotely, the 
> operations on Linux are usually pretty trivial and are based 
> on hooking up to
> signals to receive very simple messages.   Usually the message means
> "Relaod your configuration" or "Shut down propertly".
> 
> In this day and age, you might be better off just controlling your
> daemon using a tiny protocol.   You could listen on a socket on a well
> known port, and send command there, or if you are feeling Web 
> two point ohish, you can start an HttpListener and control 
> your daemon by navigating to http://localhost:YOURPORT/ and 
> issuing commands there.
> 
> Miguel
> 
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