157 lines
3.6 KiB
Go
157 lines
3.6 KiB
Go
// Copyright 2018 The containerd Authors.
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// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proc
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import (
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"context"
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"fmt"
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"github.com/containerd/console"
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)
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type execState interface {
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Resize(console.WinSize) error
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Start(context.Context) error
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Delete(context.Context) error
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Kill(context.Context, uint32, bool) error
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SetExited(int)
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}
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type execCreatedState struct {
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p *execProcess
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}
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func (s *execCreatedState) name() string {
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return "created"
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}
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func (s *execCreatedState) transition(transition stateTransition) {
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switch transition {
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case running:
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s.p.execState = &execRunningState{p: s.p}
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case stopped:
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s.p.execState = &execStoppedState{p: s.p}
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case deleted:
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s.p.execState = &deletedState{}
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default:
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panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
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}
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}
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func (s *execCreatedState) Resize(ws console.WinSize) error {
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return s.p.resize(ws)
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}
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func (s *execCreatedState) Start(ctx context.Context) error {
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if err := s.p.start(ctx); err != nil {
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return err
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}
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s.transition(running)
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return nil
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}
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func (s *execCreatedState) Delete(context.Context) error {
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s.p.delete()
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s.transition(deleted)
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return nil
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}
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func (s *execCreatedState) Kill(ctx context.Context, sig uint32, all bool) error {
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return s.p.kill(ctx, sig, all)
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}
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func (s *execCreatedState) SetExited(status int) {
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s.p.setExited(status)
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s.transition(stopped)
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}
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type execRunningState struct {
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p *execProcess
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}
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func (s *execRunningState) name() string {
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return "running"
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}
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func (s *execRunningState) transition(transition stateTransition) {
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switch transition {
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case stopped:
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s.p.execState = &execStoppedState{p: s.p}
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default:
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panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
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}
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}
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func (s *execRunningState) Resize(ws console.WinSize) error {
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return s.p.resize(ws)
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}
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func (s *execRunningState) Start(context.Context) error {
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return fmt.Errorf("cannot start a running process")
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}
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func (s *execRunningState) Delete(context.Context) error {
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return fmt.Errorf("cannot delete a running process")
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}
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func (s *execRunningState) Kill(ctx context.Context, sig uint32, all bool) error {
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return s.p.kill(ctx, sig, all)
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}
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func (s *execRunningState) SetExited(status int) {
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s.p.setExited(status)
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s.transition(stopped)
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}
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type execStoppedState struct {
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p *execProcess
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}
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func (s *execStoppedState) name() string {
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return "stopped"
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}
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func (s *execStoppedState) transition(transition stateTransition) {
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switch transition {
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case deleted:
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s.p.execState = &deletedState{}
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default:
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panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
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}
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}
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func (s *execStoppedState) Resize(console.WinSize) error {
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return fmt.Errorf("cannot resize a stopped container")
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}
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func (s *execStoppedState) Start(context.Context) error {
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return fmt.Errorf("cannot start a stopped process")
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}
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func (s *execStoppedState) Delete(context.Context) error {
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s.p.delete()
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s.transition(deleted)
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return nil
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}
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func (s *execStoppedState) Kill(_ context.Context, sig uint32, _ bool) error {
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return handleStoppedKill(sig)
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}
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func (s *execStoppedState) SetExited(int) {
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// no op
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}
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