🚀 go-pugleaf

Arnie Mauer wrote:

>I have a console app.  All of main runs in a try/catch block.  The app logs
>messages including successful completion or any exceptions caught.  The
>problem is that (a customer reported) it just disappears with no logging.
>I'm thinking someone might be using task manager to kill it.
>
>I built a test app and used task manager to kill it.  It does get killed.  I
>have set up signal handlers for:
>
>   signal( SIGINT, ImDead );
>
>but "ImDead" never gets called upon termination.  Is there any other
>mechanism that a process can use to detect if it's being killed?

I don't use exceptions, but use
		SetConsoleCtrlHandler( &CtrlHandler, TRUE);
And at least on XP, EndTask triggers it.
Note that CtrlHandler seems to run as a new thread (Your app is still
running, but will terminate soon after you return.)
I use CtrlHandler to close all open file handles, and to erase an
entry in a "who's running" file. 
Occasionally, the app throws an error for Invalid Handle because the
emergency shutdown has closed and invalidated the handles.


static BOOL _stdcall CtrlHandler(DWORD fdwCtrlType)
{
    switch (fdwCtrlType)
    { 
	/* CTRL+CLOSE: confirm that the user wants to exit. */
/*	Ctrl_Close _needs_ to return False because I don't want a
dialog poping up.*/
	case CTRL_CLOSE_EVENT:
		EmergencyShutdown();
		return FALSE;
 
        /* Pass other signals to the next handler. */ 
	case CTRL_LOGOFF_EVENT:
        case CTRL_SHUTDOWN_EVENT: 
	case CTRL_BREAK_EVENT:
		EmergencyShutdown();
		return TRUE;
	default:
	    return FALSE;
    }; 
}
static void EmergencyShutdown(void)
{
	remove_whoson();
	UnwindLockQue();
	UnwindFileQue();
	/*  remove myself from the handler queue  */
	SetConsoleCtrlHandler( &CtrlHandler, FALSE);
}