From:	Waldemar Schultz <schultz AT ma DOT tum DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Fool_Proof
Date:	Tue, 02 Nov 1999 12:37:52 +0100
Organization:	[posted via] Leibniz-Rechenzentrum, Muenchen (Germany)
Lines:	72
Distribution:	world
Message-ID:	<381ECD10.8D177FC8@ma.tum.de>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I used to use some code as posted below for intercept certain events
under my old Symantec-C / Zortech-C platform.

Now I'd like to have a similar functionality with DJGPP.
I was reading the manuals/FAQ's but the only thing I found,
was how to intercept CONTROL_C using signal();
Any hints ? Thank you.
=====================================================
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <int.h>

#define INT_PRT_SCR 0x05 /* PrintScreen          [Druck]             */
#define INT_CNTRL_P 0x17 /* Control-P            [Strg-P]            */
#define INT_C_BREAK 0x1B /* Control-Break        [Strg-Pause]        */
#define INT_CNTRL_C 0x23 /* Control-C | -2(???)  [Strg-C | -2 (???)] */
#if 0
 #define INT_PAUSE   0x?? /*Pause (or ^S) HOW TO ??*/
#endif

int Intoff=0;

int do_ctrl(struct INT_DATA *pd) {
  pd=pd;
  return 1; //rti
}

/*this should intercept EVERYTHING that could crash/hang/abort the
program */
void Int_Off(void) {
 if(Intoff) return;

 int_intercept(INT_CNTRL_P,do_ctrl, 0);
 int_intercept(INT_PRT_SCR,do_ctrl, 0);
 int_intercept(INT_C_BREAK,do_ctrl, 0);
 int_intercept(INT_CNTRL_C,do_ctrl, 0);
 /* more stuff ?? */
 Intoff=1;
}

/* this should restore EVERYTHING to it's initial state */
void Int_On(void) {
 if(!Intoff) return;
 int_restore (INT_CNTRL_C);
 int_restore (INT_C_BREAK);
 int_restore (INT_CNTRL_P);
 int_restore (INT_PRT_SCR);
 /* more stuff ?? */
 Intoff=0;
}

int main(void) {
int c=0;

 Int_Off();
 do
 {
  if(kbhit())
   c=getch();
  printf("."); fflush(stdout); /* any action */
 }
 while(c!='\x1b'); /*Escape*/
 Int_On();
 return 0;
}
--
 Gruss Waldemar Schultz.
 Technische Universität München, Zentrum Mathematik M1, D 80290 München
 Tel: +49 (0)89 2892 8226        FAX: +49 (0)89 2892 8228

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