rancherOS/vendor/github.com/opencontainers/runc/libcontainer/console_freebsd.go

// +build freebsd

package libcontainer

import (
	"errors"
)

// NewConsole returns an initalized console that can be used within a container by copying bytes
// from the master side to the slave that is attached as the tty for the container's init process.
func NewConsole(uid, gid int) (Console, error) {
	return nil, errors.New("libcontainer console is not supported on FreeBSD")
}