package libcontainerd
 
 import "io"
 
 // State constants used in state change reporting.
 const (
 	StateStart        = "start-container"
 	StatePause        = "pause"
 	StateResume       = "resume"
 	StateExit         = "exit"
 	StateRestart      = "restart"
 	StateRestore      = "restore"
 	StateStartProcess = "start-process"
 	StateExitProcess  = "exit-process"
 	StateOOM          = "oom" // fake state
 	stateLive         = "live"
 )
 
 // StateInfo contains description about the new state container has entered.
 type StateInfo struct { // FIXME: event?
 	State     string
 	Pid       uint32
 	ExitCode  uint32
 	ProcessID string
 	OOMKilled bool // TODO Windows containerd factor out
 }
 
 // Backend defines callbacks that the client of the library needs to implement.
 type Backend interface {
 	StateChanged(containerID string, state StateInfo) error
 	AttachStreams(processFriendlyName string, io IOPipe) error
 }
 
 // Client provides access to containerd features.
 type Client interface {
 	Create(containerID string, spec Spec, options ...CreateOption) error
 	Signal(containerID string, sig int) error
 	AddProcess(containerID, processFriendlyName string, process Process) error
 	Resize(containerID, processFriendlyName string, width, height int) error
 	Pause(containerID string) error
 	Resume(containerID string) error
 	Restore(containerID string, options ...CreateOption) error
 	Stats(containerID string) (*Stats, error)
 	GetPidsForContainer(containerID string) ([]int, error)

 	Summary(containerID string) ([]Summary, error)

 	UpdateResources(containerID string, resources Resources) error
 }
 
 // CreateOption allows to configure parameters of container creation.
 type CreateOption interface {
 	Apply(interface{}) error
 }
 
 // IOPipe contains the stdio streams.
 type IOPipe struct {
 	Stdin    io.WriteCloser
 	Stdout   io.Reader
 	Stderr   io.Reader
 	Terminal bool // Whether stderr is connected on Windows
 }