Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site amiga.amiga.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!decwrl!pyramid!amiga!bruceb
From: bruceb@amiga.UUCP (Bruce Barrett)
Newsgroups: net.micro.amiga
Subject: Break detection (^C) On the Amiga.
Message-ID: <776@amiga.amiga.UUCP>
Date: Fri, 28-Feb-86 20:37:17 EST
Article-I.D.: amiga.776
Posted: Fri Feb 28 20:37:17 1986
Date-Received: Sat, 1-Mar-86 23:58:09 EST
Reply-To: bruceb@amiga.UUCP (Bruce Barrett)
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 46

Hi friends, it's me (BruceB) again with a brief lesson on break detection
on the Amiga.

I think someone actually requested this information, but we're busy guys
(and gals) around here and don't always keep track.  Anyway, I needed this
for my current application so thought I'd share it.

If you don't have or don't want to use Lattice's routines for ^C detection
you can do the following instead (see program).  [BTW Lattice has to be
doing something real similar.]  Also please note that if your program 
does a Wait() anyway you can include the ^C (^D, ^E, or ^F)
flags as well.  Please be warned that SetSignal() will clear the bit you
are checking so you should look at oldsigs rather than calling SetSignal()
again.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
/* mybreak.c - look for break (^C) */
/* Note: This does NOT require any of the Lattice libraries or */
/* run time routines.					       */
/* Public domain, ,and you're welcome to it!		       */

#include	"libraries/dos.h"	/* Needed for the control-C */
					/* bit number */

main()
{
    int		loop;
    LONG	newsigs;
    LONG	oldsigs;
    
    loop = TRUE;
    newsigs = 0;
    
    while (loop) {
	Delay(15);		/* Keep it slow */
	printf("*");
	oldsigs = SetSignal(newsigs, 1 << SIGBREAKB_CTRL_C);
	if (oldsigs & (1 << SIGBREAKB_CTRL_C) ) {
	    printf ("\nControl-C detected.\nDone.\n");
	    loop = FALSE;
	}			/* end if if */
    }				/* end of while */

}				/* end of main */
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Enjoy!
	Bruce Barrett