diff options
author | gVisor bot <gvisor-bot@google.com> | 2020-07-13 16:10:58 -0700 |
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committer | gVisor bot <gvisor-bot@google.com> | 2020-07-13 16:10:58 -0700 |
commit | c81ac8ec3b78f898e75830a93b5ed3085b785fd6 (patch) | |
tree | 03042d0bb4b544533d08da6625069d3e6c10d657 /pkg/shim/v2/service_linux.go | |
parent | 59a5479409094b141a60cfcc65f0a53d7871e2e1 (diff) | |
parent | 2afff44403e046078301de39f0252bb57fc018c7 (diff) |
Merge pull request #2672 from amscanne:shim-integrated
PiperOrigin-RevId: 321053634
Diffstat (limited to 'pkg/shim/v2/service_linux.go')
-rw-r--r-- | pkg/shim/v2/service_linux.go | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/pkg/shim/v2/service_linux.go b/pkg/shim/v2/service_linux.go new file mode 100644 index 000000000..1800ab90b --- /dev/null +++ b/pkg/shim/v2/service_linux.go @@ -0,0 +1,108 @@ +// Copyright 2018 The containerd Authors. +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// +build linux + +package v2 + +import ( + "context" + "fmt" + "io" + "sync" + "syscall" + + "github.com/containerd/console" + "github.com/containerd/fifo" +) + +type linuxPlatform struct { + epoller *console.Epoller +} + +func (p *linuxPlatform) CopyConsole(ctx context.Context, console console.Console, stdin, stdout, stderr string, wg *sync.WaitGroup) (console.Console, error) { + if p.epoller == nil { + return nil, fmt.Errorf("uninitialized epoller") + } + + epollConsole, err := p.epoller.Add(console) + if err != nil { + return nil, err + } + + if stdin != "" { + in, err := fifo.OpenFifo(context.Background(), stdin, syscall.O_RDONLY|syscall.O_NONBLOCK, 0) + if err != nil { + return nil, err + } + go func() { + p := bufPool.Get().(*[]byte) + defer bufPool.Put(p) + io.CopyBuffer(epollConsole, in, *p) + }() + } + + outw, err := fifo.OpenFifo(ctx, stdout, syscall.O_WRONLY, 0) + if err != nil { + return nil, err + } + outr, err := fifo.OpenFifo(ctx, stdout, syscall.O_RDONLY, 0) + if err != nil { + return nil, err + } + wg.Add(1) + go func() { + p := bufPool.Get().(*[]byte) + defer bufPool.Put(p) + io.CopyBuffer(outw, epollConsole, *p) + epollConsole.Close() + outr.Close() + outw.Close() + wg.Done() + }() + return epollConsole, nil +} + +func (p *linuxPlatform) ShutdownConsole(ctx context.Context, cons console.Console) error { + if p.epoller == nil { + return fmt.Errorf("uninitialized epoller") + } + epollConsole, ok := cons.(*console.EpollConsole) + if !ok { + return fmt.Errorf("expected EpollConsole, got %#v", cons) + } + return epollConsole.Shutdown(p.epoller.CloseConsole) +} + +func (p *linuxPlatform) Close() error { + return p.epoller.Close() +} + +// initialize a single epoll fd to manage our consoles. `initPlatform` should +// only be called once. +func (s *service) initPlatform() error { + if s.platform != nil { + return nil + } + epoller, err := console.NewEpoller() + if err != nil { + return fmt.Errorf("failed to initialize epoller: %w", err) + } + s.platform = &linuxPlatform{ + epoller: epoller, + } + go epoller.Wait() + return nil +} |