_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

ANSI/ISO C	No
POSIX	No

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; }