[ros-kernel] Handling of user mode exceptions in ros

[Thomas Weidenmueller]

Anich Gregor wrote:

> I was looking at a function which Royce has written... it works like this:
>
>1) Does a syscall to the "real" function which tells how much memory it needs
>2) Allocates that memory
>3) Does the same syscall, this time passing in the buffer which in turn is 
>filled by the function.
>4) Calls the callback
>5) Frees that memory
>
>I think this is a good way to do it (what do you think? :)
>  
>
yes we're wrinting functions this way if possible. But this way is not 
possible in every circumstance, e.g. SendMessage() requires callbacks to 
usermode in certain cases.

Regards
Thomas