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