mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
52ed3e0896
Updates swarmkit, grpc, and all related vendors Signed-off-by: Derek McGowan <derek@mcgstyle.net>
97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
// +build linux
|
|
|
|
/*
|
|
Copyright The containerd 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
|
|
|
|
http://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.
|
|
*/
|
|
|
|
package fifo
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"sync"
|
|
"syscall"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
const O_PATH = 010000000
|
|
|
|
type handle struct {
|
|
f *os.File
|
|
fd uintptr
|
|
dev uint64
|
|
ino uint64
|
|
closeOnce sync.Once
|
|
name string
|
|
}
|
|
|
|
func getHandle(fn string) (*handle, error) {
|
|
f, err := os.OpenFile(fn, O_PATH, 0)
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "failed to open %v with O_PATH", fn)
|
|
}
|
|
|
|
var (
|
|
stat syscall.Stat_t
|
|
fd = f.Fd()
|
|
)
|
|
if err := syscall.Fstat(int(fd), &stat); err != nil {
|
|
f.Close()
|
|
return nil, errors.Wrapf(err, "failed to stat handle %v", fd)
|
|
}
|
|
|
|
h := &handle{
|
|
f: f,
|
|
name: fn,
|
|
dev: uint64(stat.Dev),
|
|
ino: stat.Ino,
|
|
fd: fd,
|
|
}
|
|
|
|
// check /proc just in case
|
|
if _, err := os.Stat(h.procPath()); err != nil {
|
|
f.Close()
|
|
return nil, errors.Wrapf(err, "couldn't stat %v", h.procPath())
|
|
}
|
|
|
|
return h, nil
|
|
}
|
|
|
|
func (h *handle) procPath() string {
|
|
return fmt.Sprintf("/proc/self/fd/%d", h.fd)
|
|
}
|
|
|
|
func (h *handle) Name() string {
|
|
return h.name
|
|
}
|
|
|
|
func (h *handle) Path() (string, error) {
|
|
var stat syscall.Stat_t
|
|
if err := syscall.Stat(h.procPath(), &stat); err != nil {
|
|
return "", errors.Wrapf(err, "path %v could not be statted", h.procPath())
|
|
}
|
|
if uint64(stat.Dev) != h.dev || stat.Ino != h.ino {
|
|
return "", errors.Errorf("failed to verify handle %v/%v %v/%v", stat.Dev, h.dev, stat.Ino, h.ino)
|
|
}
|
|
return h.procPath(), nil
|
|
}
|
|
|
|
func (h *handle) Close() error {
|
|
h.closeOnce.Do(func() {
|
|
h.f.Close()
|
|
})
|
|
return nil
|
|
}
|