On Thu, 28 Nov 2002, Eric Auer wrote:
> anybody knows how I would write a Control Break handler for EDIT 0.5b ?
Borland/Turbo C has a wrapper for it:
ctrlbrk() (in conjunction with setcbrk and getcbrk)
Syntax
#include <dos.h>
void ctrlbrk(int (*handler)(void));
Description
Sets control-break handler.
ctrlbrk sets a new control-break handler function pointed to by handler.
The interrupt vector 0x23 is modified to call the named function.
ctrlbrk establishes a DOS interrupt handler that calls the named function;
the named function is not called directly.
The handler function can perform any number of operations and system
calls. The handler does not have to return; it can use longjmp to return
to an arbitrary point in the program. The handler function returns 0 to
abort the current program; any other value causes the program to resume
execution.
Return Value
ctrlbrk returns nothing.
Example:
#include <stdio.h>
#include <dos.h>
#define ABORT 0
int c_break(void)
{
printf("Control-Break pressed. Program aborting ...\n");
return (ABORT);
}
void main(void)
{
ctrlbrk(c_break);
for(;;)
{
printf("Looping... Press <Ctrl-Break> to quit:\n");
}
}
If you need something different, you can hook up INT-23 and do whatever
you want -- you have to use an "interrupt" function then and manipulate
the registers accordingly; FreeCOM includes an assembly portion therefore.
Bye,
--
Steffen Kaiser
The current maintainer of [EMAIL PROTECTED]
http://freedos.sourceforge.net/freecom/FreeCOM.html
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