// The os/user functions may fail for any number of reasons
		// (not implemented on that platform, cgo not enabled, etc).
		if u, ok := userMap.Load(h.Uid); ok {
			h.Uname = u.(string)
		} else if u, err := user.LookupId(strconv.Itoa(h.Uid)); err == nil {
			h.Uname = u.Username
			userMap.Store(h.Uid, h.Uname)
		}
		if g, ok := groupMap.Load(h.Gid); ok {
			h.Gname = g.(string)

pkg os/exec, var ErrNotFound error
pkg os/signal, func Notify(chan<- os.Signal, ...os.Signal)
pkg os/user, func Current() (*User, error)
pkg os/user, func Lookup(string) (*User, error)
pkg os/user, func LookupId(string) (*User, error)
pkg os/user, method (UnknownUserError) Error() string
pkg os/user, method (UnknownUserIdError) Error() string
pkg os/user, type UnknownUserError string
pkg os/user, type UnknownUserIdError int