github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/pkg/sentry/devices/accel/accel_unsafe.go (about)

     1  // Copyright 2023 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package accel
    16  
    17  import (
    18  	"unsafe"
    19  
    20  	"golang.org/x/exp/constraints"
    21  	"golang.org/x/sys/unix"
    22  	"github.com/MerlinKodo/gvisor/pkg/abi/gasket"
    23  )
    24  
    25  func ioctlInvokePtrArg[Params any](hostFd int32, cmd gasket.Ioctl, params *Params) (uintptr, error) {
    26  	return ioctlInvoke[uintptr](hostFd, cmd, uintptr(unsafe.Pointer(params)))
    27  }
    28  
    29  func ioctlInvoke[Arg constraints.Integer](hostFd int32, cmd gasket.Ioctl, arg Arg) (uintptr, error) {
    30  	n, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(hostFd), uintptr(cmd), uintptr(arg))
    31  	if errno != 0 {
    32  		return n, errno
    33  	}
    34  	return n, nil
    35  }