> +       if (sizeof_buffer > sizeof (buffer))
>> +       sizeof_buffer = sizeof (buffer);
> 
> 
> Now you've thrown away your rounding on the ending address.
> 
> 
>> +       count = sizeof_buffer / sizeof (PTRACE_XFER_TYPE);
> 
> 
> Now count will never be greater than 250, so all writes of
> greater than 1000 bytes will lose.
> 


Yes.  I found/fixed them + forgot to flush the insn cache + forgot to 
increment myaddr + forgot to write to i of d didn't work, yet it was 
still as broken!  Eventually I found the only real bug :-^

> +         memcpy (buffer + addr_off, myaddr, addr_len);


It should be ``(char*)buffer + addr_off'' :-(

Attatched is a version that appears to work (no regressions).

enjoy,
Andrew