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moby--moby/pkg/loopback/ioctl.go

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// +build linux,cgo
package loopback
import (
"unsafe"
"golang.org/x/sys/unix"
)
func ioctlLoopCtlGetFree(fd uintptr) (int, error) {
index, err := unix.IoctlGetInt(int(fd), LoopCtlGetFree)
if err != nil {
return 0, err
}
return index, nil
}
func ioctlLoopSetFd(loopFd, sparseFd uintptr) error {
return unix.IoctlSetInt(int(loopFd), LoopSetFd, int(sparseFd))
}
func ioctlLoopSetStatus64(loopFd uintptr, loopInfo *loopInfo64) error {
if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, LoopSetStatus64, uintptr(unsafe.Pointer(loopInfo))); err != 0 {
return err
}
return nil
}
func ioctlLoopClrFd(loopFd uintptr) error {
if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, LoopClrFd, 0); err != 0 {
return err
}
return nil
}
func ioctlLoopGetStatus64(loopFd uintptr) (*loopInfo64, error) {
loopInfo := &loopInfo64{}
if _, _, err := unix.Syscall(unix.SYS_IOCTL, loopFd, LoopGetStatus64, uintptr(unsafe.Pointer(loopInfo))); err != 0 {
return nil, err
}
return loopInfo, nil
}
func ioctlLoopSetCapacity(loopFd uintptr, value int) error {
return unix.IoctlSetInt(int(loopFd), LoopSetCapacity, value)
}