Re: You could do worse than Mach ports

[Peter da Silva <peter-dragonfly@xxxxxxxxxxx>]

Matthew Dillon wrote:
>     For system calls the foreign address space is the user process's
>     address space.  User data pointers come in three forms:
>
>     (1) They represent a file path
>     (2) They represent a large block of data (e.g. the buffer in a read())
>     (3) They represent a small block of data (e.g. gettimeofday()).
>     (4) They represent the message itself

Question:

What component is responsible for this rewriting?

	The wrapper or other user code?
	Send() to kernel?
	The receiving system call?
	Something in between?

Could it be table-driven? If so, then the table could provide a place to 
 handle versioning...