388             return Err(SystemError::EINVAL);  in accept4()
457             return Err(SystemError::EINVAL);  in getsockname()
463         let endpoint: Endpoint = socket.endpoint().ok_or(SystemError::EINVAL)?;  in getsockname()
486             return Err(SystemError::EINVAL);  in getpeername()
493         let endpoint: Endpoint = socket.peer_endpoint().ok_or(SystemError::EINVAL)?;  in getpeername()
574                         return Err(SystemError::EINVAL);  in to_endpoint()
590                         .map_err(|_| SystemError::EINVAL)?  in to_endpoint()
592                         .map_err(|_| SystemError::EINVAL)?;  in to_endpoint()
610                     return Err(SystemError::EINVAL);  in to_endpoint()
614                     return Err(SystemError::EINVAL);  in to_endpoint()
617                     return Err(SystemError::EINVAL);  in to_endpoint()
629             AddressFamily::Unix => Err(SystemError::EINVAL),  in len()
630             _ => Err(SystemError::EINVAL),  in len()
936             None => Err(SystemError::EINVAL),  in try_from()
1025             None => Err(SystemError::EINVAL),  in try_from()