Category : C Source Code
Archive   : POLY3DRS.ZIP
Filename : CTRL-BRK.C

 
Output of file : CTRL-BRK.C contained in archive : POLY3DRS.ZIP
/*****************************************************************************
* Module to trap ctrl-brk/hardware error and handle them gracefully. *
* Note the usage of GraphGen.c module is assumed. *
* *
* Written by: Gershon Elber Ver 1.0, Jan. 1989 *
*****************************************************************************/

#ifdef __MSDOS__
#include
#include
#else
#include
#endif /* __MSDOS__ */

#include
#include "program.h"
#include "ctrl-brk.h"

#ifdef __MSDOS__
static void far *OldCtrlBrk; /* Save here old int 1bh to be able to restore. */
#endif /* __MSDOS__ */

static int WasCtrlBrkSetUp = FALSE; /* TRUE if SetUpCtrlBrk rtn was called. */
int WasCtrlBrk;

#ifdef __MSDOS__

/*****************************************************************************
* Routine TrapCtrlBrk gain control if Control break was typed: *
*****************************************************************************/
static void interrupt TrapCtrlBrk(void)
{
WasCtrlBrk = TRUE;
}

#endif /* __MSDOS__ */

/*****************************************************************************
* Routine TrapCtrlC gain control if Control C was typed (DOS level): *
*****************************************************************************/
static int TrapCtrlC(void)
{
WasCtrlBrk = TRUE;

#ifndef __MSDOS__
printf("\n*** Break ***\n");
#endif /* __MSDOS__ */

return -1; /* Resume execution. */
}

/*****************************************************************************
* Routine SetUpCtrlBrk must be called once by main program: *
*****************************************************************************/
void SetUpCtrlBrk(void)
{
if (WasCtrlBrkSetUp) return; /* No need to to it twice! */

#ifdef __MSDOS__
OldCtrlBrk = getvect(BIOS_CTRL_BRK);
setvect(BIOS_CTRL_BRK, TrapCtrlBrk);

ctrlbrk(TrapCtrlC);
#else
signal(SIGINT, TrapCtrlC);
signal(SIGQUIT, TrapCtrlC);
#endif /* __MSDOS__ */

WasCtrlBrkSetUp = TRUE;
}

/*****************************************************************************
* Routine RestoreCtrlBrk must be called before the program quit: *
*****************************************************************************/
void RestoreCtrlBrk(void)
{
#ifdef __MSDOS__
if (WasCtrlBrkSetUp)
setvect(BIOS_CTRL_BRK, (void interrupt (*)()) OldCtrlBrk);
#endif /* __MSDOS__ */

WasCtrlBrkSetUp = FALSE;
}

#ifdef __MSDOS__

/*****************************************************************************
* Routine TrapHardWareError gain control if hardware fails - int 24. *
*****************************************************************************/
static int TrapHardWareError(int errval, int ax, int bp, int si)
{
return IGNORE;
}

#endif /* __MSDOS__ */

/*****************************************************************************
* Routine SetUpHardError must be called once by main program: *
* harderr set interrupt vector 0x024 to point to TrapHardWareError. *
*****************************************************************************/
void SetUpHardErr(void)
{
#ifdef __MSDOS__
harderr(TrapHardWareError);
#endif /* __MSDOS__ */
}


  3 Responses to “Category : C Source Code
Archive   : POLY3DRS.ZIP
Filename : CTRL-BRK.C
”

  1. Daniel says:
    January 27, 2013 at 3:59 pm

    Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. Joshie says:
    March 18, 2014 at 4:57 pm

    This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. DiskingRound says:
    January 14, 2015 at 10:57 pm

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