github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/daemon/logger/plugin_unix.go (about)

     1  // +build linux freebsd
     2  
     3  package logger // import "github.com/docker/docker/daemon/logger"
     4  
     5  import (
     6  	"context"
     7  	"io"
     8  
     9  	"github.com/containerd/fifo"
    10  	"github.com/pkg/errors"
    11  	"golang.org/x/sys/unix"
    12  )
    13  
    14  func openPluginStream(a *pluginAdapter) (io.WriteCloser, error) {
    15  	// Make sure to also open with read (in addition to write) to avoid borken pipe errors on plugin failure.
    16  	// It is up to the plugin to keep track of pipes that it should re-attach to, however.
    17  	// If the plugin doesn't open for reads, then the container will block once the pipe is full.
    18  	f, err := fifo.OpenFifo(context.Background(), a.fifoPath, unix.O_RDWR|unix.O_CREAT|unix.O_NONBLOCK, 0700)
    19  	if err != nil {
    20  		return nil, errors.Wrapf(err, "error creating i/o pipe for log plugin: %s", a.Name())
    21  	}
    22  	return f, nil
    23  }