pub fn envid2env(envid: u32, checkperm: bool) -> Result<usize, KError>Expand description
Get the env’s PCB by its id. If checkperm is set, the method will check
whether the env just is the current env or the child of it. If not,
KError::BadEnv will be returned with a Err wrapper.
§Safety
The e get by index SHELL be valid.