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49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
// +build linux
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package loopback // import "github.com/docker/docker/pkg/loopback"
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import (
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func ioctlLoopCtlGetFree(fd uintptr) (int, error) {
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index, err := unix.IoctlGetInt(int(fd), LoopCtlGetFree)
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if err != nil {
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return 0, err
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}
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return index, nil
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}
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func ioctlLoopSetFd(loopFd, sparseFd uintptr) error {
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return unix.IoctlSetInt(int(loopFd), unix.LOOP_SET_FD, int(sparseFd))
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}
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func ioctlLoopSetStatus64(loopFd uintptr, loopInfo *unix.LoopInfo64) error {
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if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, unix.LOOP_SET_STATUS64, uintptr(unsafe.Pointer(loopInfo))); err != 0 {
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return err
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}
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return nil
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}
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func ioctlLoopClrFd(loopFd uintptr) error {
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if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, unix.LOOP_CLR_FD, 0); err != 0 {
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return err
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}
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return nil
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}
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func ioctlLoopGetStatus64(loopFd uintptr) (*unix.LoopInfo64, error) {
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loopInfo := &unix.LoopInfo64{}
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if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, unix.LOOP_GET_STATUS64, uintptr(unsafe.Pointer(loopInfo))); err != 0 {
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return nil, err
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}
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return loopInfo, nil
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}
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func ioctlLoopSetCapacity(loopFd uintptr, value int) error {
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return unix.IoctlSetInt(int(loopFd), unix.LOOP_SET_CAPACITY, value)
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}
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