Re: How to exit an Ada program with (unix shell) error code?

["Hibou57 (Yannick Duchêne)" <yannick_duchene@yahoo.fr>]

On 5 mai, 22:48, a...@anon.org (anon) wrote:
> Actually, Adam the design for all OS currectly use today states that if the
> program returns the "Accumulator Register" will contain the program exit
> code. Been a standard for at least 40 years.
>

Not sure,

The DOS interrupt 21h function 0h, which ends *.COM program (does not
apply to *.EXE due to the PSP allocation logic), set the AH register
to zero and does not interpret AL : no exit code in the accumulator
AX.

The DOS interrupt 21h function 31h (TSR : terminate and stay resident)
for *.COM and *.EXE, and interrupt 21h function 4Ch (terminate and
free program instance) both expect the AH register set with the
function code (31h or 4Ch) and the exit code in AL. The accumulator is
splitted with a function code in the high byte and an exit code in the
low byte : the accumulator AX does not represent an exit code (only
the low byte).

Note : this reply is just for fun :P