_go32_dpmi_set_protected_mode_interrupt_vector

Syntax

#include <dpmi.h>

int _go32_dpmi_set_protected_mode_interrupt_vector(int vector, _go32_dpmi_seginfo *info);

Description

See section DPMI Overview

This function sets the protected mode interrupt vector specified to point to the given function. The pm_offset and pm_selector fields of info must be filled in (see section _go32_my_cs). The following should be noted:

• You may not longjmp out of an interrupt handler.
• You may not make any function calls that require system calls, such as printf.
• This function will not wrap the handler for you. The _go32_dpmi_allocate_iret_wrapper and _go32_dpmi_chain_protected_mode_interrupt_vector functions can wrap your function if you want.
• You must set the pm_selector field of info. Use _go32_my_cs to get a selector valid for your functions.

Return Value

Zero on success, nonzero on failure.

Portability

not ANSI, not POSIX

Example

volatile int tics = 0;

timer_handler()
{
  tics++;
}

int main()
{
  _go32_dpmi_seginfo old_handler, new_handler;

  printf("grabbing timer interrupt\n");
  _go32_dpmi_get_protected_mode_interrupt_vector(8, &old_handler);
  
  new_handler.pm_offset = (int)tic_handler;
  new_handler.pm_selector = _go32_my_cs();
  _go32_dpmi_chain_protected_mode_interrupt_vector(8, &new_handler);

  getkey();

  printf("releasing timer interrupt\n");
  _go32_dpmi_set_protected_mode_interrupt_vector(8, &old_handler);

  return 0;
}

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