vc: modify ioctl function to handle shim test

The kata shim tests make use of an ioctl function, so instead
of having a custom one within that file, use the ioctl
function in utils/utils_linux

Fixes #1419

Signed-off-by: Gabi Beyer <Gabrielle.n.beyer@intel.com>

virtcontainers/kata_shim_test.go

@@ -18,6 +18,7 @@ import (
 	"unsafe"
 
 	. "github.com/kata-containers/runtime/virtcontainers/pkg/mock"
+	"github.com/kata-containers/runtime/virtcontainers/utils"
 )
 
 const (
@@ -281,26 +282,18 @@ func TestKataShimStartWithConsoleNonExistingFailure(t *testing.T) {
 	testKataShimStart(t, sandbox, params, true)
 }
 
-func ioctl(fd uintptr, flag, data uintptr) error {
-	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, flag, data); err != 0 {
-		return err
-	}
-
-	return nil
-}
-
 // unlockpt unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by f.
 func unlockpt(f *os.File) error {
 	var u int32
 
-	return ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
+	return utils.Ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
 }
 
 // ptsname retrieves the name of the first available pts for the given master.
 func ptsname(f *os.File) (string, error) {
 	var n int32
 
-	if err := ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
+	if err := utils.Ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
 		return "", err
 	}
 

virtcontainers/utils/utils_linux.go

@@ -20,20 +20,18 @@ import (
 // VHOST_VSOCK_SET_GUEST_CID = _IOW(VHOST_VIRTIO, 0x60, __u64)
 const ioctlVhostVsockSetGuestCid = 0x4008AF60
 
-var ioctlFunc = ioctl
+var ioctlFunc = Ioctl
 
 // maxUInt represents the maximum valid value for the context ID.
 // The upper 32 bits of the CID are reserved and zeroed.
 // See http://stefanha.github.io/virtio/
 var maxUInt uint64 = 1<<32 - 1
 
-func ioctl(fd uintptr, request int, arg1 uint64) error {
-	if _, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		fd,
-		uintptr(request),
-		uintptr(unsafe.Pointer(&arg1)),
-	); errno != 0 {
+func Ioctl(fd uintptr, request, data uintptr) error {
+	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, fd, request, data); errno != 0 {
+		//uintptr(request)
+		//uintptr(unsafe.Pointer(&arg1)),
+		//); errno != 0 {
 		return os.NewSyscallError("ioctl", fmt.Errorf("%d", int(errno)))
 	}
 
@@ -75,14 +73,14 @@ func FindContextID() (*os.File, uint64, error) {
 
 	// Looking for the first available context ID.
 	for cid := contextID; cid <= maxUInt; cid++ {
-		if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, cid); err == nil {
+		if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, uintptr(unsafe.Pointer(&cid))); err == nil {
 			return vsockFd, cid, nil
 		}
 	}
 
 	// Last chance to get a free context ID.
 	for cid := contextID - 1; cid >= firstContextID; cid-- {
-		if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, cid); err == nil {
+		if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, uintptr(unsafe.Pointer(&cid))); err == nil {
 			return vsockFd, cid, nil
 		}
 	}

virtcontainers/utils/utils_linux_test.go

@@ -15,7 +15,7 @@ import (
 func TestFindContextID(t *testing.T) {
 	assert := assert.New(t)
 
-	ioctlFunc = func(fd uintptr, request int, arg1 uint64) error {
+	ioctlFunc = func(fd uintptr, request, arg1 uintptr) error {
 		return errors.New("ioctl")
 	}