[Hook HW interrupts in flat memory mode with DOS32/A]

[liaooo]

Dear all,
I have a question about how to hook HW interrupt in flat memory mode...

@ about my application...
- application is created by combining Watcom C and DOS32/A.
- application is written for running on DOS mode( not on OS mode )
- with DOS32/A now I can access >1M memory and allocate large memory to use...(running in flat memory mode !!!)

@ current issue...
- I want to write an ISR(interrupt service routine) for one PCI card. Thus I need to "hook" the HW interrupt.
- Ex. the PCI card's interrupt line = 0xE in DOS. That means this device will issue interrupt via 8259's IRQ 14.
But I did not how to achieve my goal to hook this interrupt in flat mode ?

@ resource I found...
- in watcom C's library, there is one sample using _dos_getvect, _dos_setvect, and _chain_intr to hook INT 0x1C...
I tested this code and found OK. But when I apply it to my case: INT76 ( where IRQ 14 is "INT 0x76" <- (14-8) + 0x70 )
then nothing happened...
* I checked HW interrupt is generated but my own ISR did not invoked...

Do I lose something ? or are there any functions I can use to achieve my goal ?

[thefollower]

Hi,laooo
"hook" is an incorrect word to use, it's boastful, and misleading, you may just re-dispatch the interrupt signal at your own will

[liaooo]

here the hook means:
- save the address corresponding to INT x
- put a new address to that entry for INT x

* new address points to the user-defined routine and within it
check if belongs to mine
if YES then process it then exit with IRET
else pass control to ori routine