vendor: cilium/ebbf 4032b1d8aae306b7bb94a2a11002932caf88c644

full diff: 60c3aa43f4...4032b1d8aa

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/cilium/ebpf/internal/fd.go

@@ -0,0 +1,63 @@
+package internal
+
+import (
+	"runtime"
+	"strconv"
+
+	"github.com/cilium/ebpf/internal/unix"
+
+	"github.com/pkg/errors"
+)
+
+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, errors.Wrap(err, "can't dup fd")
+	}
+
+	return NewFD(uint32(dup)), nil
+}