fn in_window(addr: u64, len: usize) -> Option<Result<(*mut u8, usize), i32>>Expand description
Where len bytes at guest address addr lie in the supervisor’s mapping
of the mailbox, when it is in use.
§Arguments
addr- Guest address.len- Bytes from there.
§Returns
None outside the guest-stub mode; otherwise the local address and how
many of the bytes lie inside the mailbox.
§Errors
EFAULT when addr is not in the mailbox.