k3s/vendor/github.com/cilium/ebpf/internal/fd.go
2020-08-28 17:18:31 -07:00

70 lines
1.0 KiB
Go

package internal
import (
"errors"
"fmt"
"os"
"runtime"
"strconv"
"github.com/cilium/ebpf/internal/unix"
)
var ErrClosedFd = errors.New("use of closed file descriptor")
type FD struct {
raw int64
}
func NewFD(value uint32) *FD {
fd := &FD{int64(value)}
runtime.SetFinalizer(fd, (*FD).Close)
return fd
}
func (fd *FD) String() string {
return strconv.FormatInt(fd.raw, 10)
}
func (fd *FD) Value() (uint32, error) {
if fd.raw < 0 {
return 0, ErrClosedFd
}
return uint32(fd.raw), nil
}
func (fd *FD) Close() error {
if fd.raw < 0 {
return nil
}
value := int(fd.raw)
fd.raw = -1
fd.Forget()
return unix.Close(value)
}
func (fd *FD) Forget() {
runtime.SetFinalizer(fd, nil)
}
func (fd *FD) Dup() (*FD, error) {
if fd.raw < 0 {
return nil, ErrClosedFd
}
dup, err := unix.FcntlInt(uintptr(fd.raw), unix.F_DUPFD_CLOEXEC, 0)
if err != nil {
return nil, fmt.Errorf("can't dup fd: %v", err)
}
return NewFD(uint32(dup)), nil
}
func (fd *FD) File(name string) *os.File {
fd.Forget()
return os.NewFile(uintptr(fd.raw), name)
}