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moby--moby/libcontainerd/io_unix.go

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// +build !windows
package libcontainerd
import (
"context"
"io"
"syscall"
"github.com/containerd/containerd"
"github.com/containerd/fifo"
"github.com/pkg/errors"
)
func newIOPipe(fifos *containerd.FIFOSet) (*IOPipe, error) {
var (
err error
ctx, cancel = context.WithCancel(context.Background())
f io.ReadWriteCloser
iop = &IOPipe{
Terminal: fifos.Terminal,
cancel: cancel,
config: containerd.IOConfig{
Terminal: fifos.Terminal,
Stdin: fifos.In,
Stdout: fifos.Out,
Stderr: fifos.Err,
},
}
)
defer func() {
if err != nil {
cancel()
iop.Close()
}
}()
if fifos.In != "" {
if f, err = fifo.OpenFifo(ctx, fifos.In, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, errors.WithStack(err)
}
iop.Stdin = f
}
if fifos.Out != "" {
if f, err = fifo.OpenFifo(ctx, fifos.Out, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, errors.WithStack(err)
}
iop.Stdout = f
}
if fifos.Err != "" {
if f, err = fifo.OpenFifo(ctx, fifos.Err, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
return nil, errors.WithStack(err)
}
iop.Stderr = f
}
return iop, nil
}