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moby--moby/libcontainerd/process_unix.go

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// +build linux solaris
package libcontainerd
import (
"io"
"io/ioutil"
"os"
"path/filepath"
goruntime "runtime"
"strings"
containerd "github.com/containerd/containerd/api/grpc/types"
"github.com/tonistiigi/fifo"
"golang.org/x/net/context"
"golang.org/x/sys/unix"
)
var fdNames = map[int]string{
unix.Stdin: "stdin",
unix.Stdout: "stdout",
unix.Stderr: "stderr",
}
// process keeps the state for both main container process and exec process.
type process struct {
processCommon
// Platform specific fields are below here.
dir string
}
func (p *process) openFifos(ctx context.Context, terminal bool) (pipe *IOPipe, err error) {
if err := os.MkdirAll(p.dir, 0700); err != nil {
return nil, err
}
io := &IOPipe{}
io.Stdin, err = fifo.OpenFifo(ctx, p.fifo(unix.Stdin), unix.O_WRONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdin.Close()
}
}()
io.Stdout, err = fifo.OpenFifo(ctx, p.fifo(unix.Stdout), unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdout.Close()
}
}()
if goruntime.GOOS == "solaris" || !terminal {
// For Solaris terminal handling is done exclusively by the runtime therefore we make no distinction
// in the processing for terminal and !terminal cases.
io.Stderr, err = fifo.OpenFifo(ctx, p.fifo(unix.Stderr), unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stderr.Close()
}
}()
} else {
io.Stderr = ioutil.NopCloser(emptyReader{})
}
return io, nil
}
func (p *process) sendCloseStdin() error {
_, err := p.client.remote.apiClient.UpdateProcess(context.Background(), &containerd.UpdateProcessRequest{
Id: p.containerID,
Pid: p.friendlyName,
CloseStdin: true,
})
if err != nil && (strings.Contains(err.Error(), "container not found") || strings.Contains(err.Error(), "process not found")) {
return nil
}
return err
}
func (p *process) closeFifos(io *IOPipe) {
io.Stdin.Close()
io.Stdout.Close()
io.Stderr.Close()
}
type emptyReader struct{}
func (r emptyReader) Read(b []byte) (int, error) {
return 0, io.EOF
}
func (p *process) fifo(index int) string {
return filepath.Join(p.dir, p.friendlyName+"-"+fdNames[index])
}