gnumach RPC: get info about the calling task

[Joan Lledó]

Hi,

I'm working on the gnumach rpc to return a pager from a task and an 
address mapped in that task.

For security reasons I'd like to check if the calling task is the same 
as the one the given map belongs to. But I don't know how to do it.

In the rpc implementation, the function receives a vm_map_t parameter. 
How can I get the task from the vm_map_t? and how can I compare it with 
the calling task to check whether it's the same?