Thread: handle_interrupts--->SIGBREAK

Originally, SIGBREAK is handled in my program --->

Code:

/*....
...
.../
signal( SIGBREAK, (_SigFunc)handle_interrupts );
/*....
...
.../
void handle_interrupts( int code )
{

    printf( "%d Signal received. Shutting down...\n", code );

    fflush( stdout );

    logError( "%d Signal received. Shutting down...", code );

    bShutdown = 1;
}
/***/

But i found that SIGBREAK is raised when a user logs off from Windows. But it is not expected to be shutdown in this situation.
Then i remark it---->

//signal( SIGBREAK, (_SigFunc)handle_interrupts );

Then this problem is solved, but another problem raised:
When user restarts windows during using my program, it is not handled well. Since my program is about TCP/IP, in the above case, the resources cannot be released.
So.......my Q is:
1. Is "ctrl-break" triggered by "windows shutdown"?
2. If so, how can I distinguish "windows shutdown" and "user logs off" when there is a "Ctrl-break" exception?

I think you need to work your program into being a windows program rather than a console program.

Then you'll get access to all the windows events which tell you things like user logged off or shutdown in progress.