ioctl_linux.go
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ioctl_linux.go
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	// Copyright 2021 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package unix

	import "unsafe"

	// IoctlRetInt performs an ioctl operation specified by req on a device
	// associated with opened file descriptor fd, and returns a non-negative
	// integer that is returned by the ioctl syscall.
	func IoctlRetInt(fd int, req uint) (int, error) {
	ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0)
	if err != 0 {
	return 0, err
	}
	return int(ret), nil
	}

	func IoctlGetUint32(fd int, req uint) (uint32, error) {
	var value uint32
	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
	return value, err
	}

	func IoctlGetRTCTime(fd int) (*RTCTime, error) {
	var value RTCTime
	err := ioctlPtr(fd, RTC_RD_TIME, unsafe.Pointer(&value))
	return &value, err
	}

	func IoctlSetRTCTime(fd int, value *RTCTime) error {
	return ioctlPtr(fd, RTC_SET_TIME, unsafe.Pointer(value))
	}

	func IoctlGetRTCWkAlrm(fd int) (*RTCWkAlrm, error) {
	var value RTCWkAlrm
	err := ioctlPtr(fd, RTC_WKALM_RD, unsafe.Pointer(&value))
	return &value, err
	}

	func IoctlSetRTCWkAlrm(fd int, value *RTCWkAlrm) error {
	return ioctlPtr(fd, RTC_WKALM_SET, unsafe.Pointer(value))
	}

	// IoctlGetEthtoolDrvinfo fetches ethtool driver information for the network
	// device specified by ifname.
	func IoctlGetEthtoolDrvinfo(fd int, ifname string) (*EthtoolDrvinfo, error) {
	ifr, err := NewIfreq(ifname)
	if err != nil {
	return nil, err
	}

	value := EthtoolDrvinfo{Cmd: ETHTOOL_GDRVINFO}
	ifrd := ifr.withData(unsafe.Pointer(&value))

	err = ioctlIfreqData(fd, SIOCETHTOOL, &ifrd)
	return &value, err
	}

	// IoctlGetWatchdogInfo fetches information about a watchdog device from the
	// Linux watchdog API. For more information, see:
	// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
	func IoctlGetWatchdogInfo(fd int) (*WatchdogInfo, error) {
	var value WatchdogInfo
	err := ioctlPtr(fd, WDIOC_GETSUPPORT, unsafe.Pointer(&value))
	return &value, err
	}

	// IoctlWatchdogKeepalive issues a keepalive ioctl to a watchdog device. For
	// more information, see:
	// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
	func IoctlWatchdogKeepalive(fd int) error {
	// arg is ignored and not a pointer, so ioctl is fine instead of ioctlPtr.
	return ioctl(fd, WDIOC_KEEPALIVE, 0)
	}

	// IoctlFileCloneRange performs an FICLONERANGE ioctl operation to clone the
	// range of data conveyed in value to the file associated with the file
	// descriptor destFd. See the ioctl_ficlonerange(2) man page for details.
	func IoctlFileCloneRange(destFd int, value *FileCloneRange) error {
	return ioctlPtr(destFd, FICLONERANGE, unsafe.Pointer(value))
	}

	// IoctlFileClone performs an FICLONE ioctl operation to clone the entire file
	// associated with the file description srcFd to the file associated with the
	// file descriptor destFd. See the ioctl_ficlone(2) man page for details.
	func IoctlFileClone(destFd, srcFd int) error {
	return ioctl(destFd, FICLONE, uintptr(srcFd))
	}

	type FileDedupeRange struct {
	Src_offset uint64
	Src_length uint64
	Reserved1 uint16
	Reserved2 uint32
	Info []FileDedupeRangeInfo
	}

	type FileDedupeRangeInfo struct {
	Dest_fd int64
	Dest_offset uint64
	Bytes_deduped uint64
	Status int32
	Reserved uint32
	}

	// IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the
	// range of data conveyed in value from the file associated with the file
	// descriptor srcFd to the value.Info destinations. See the
	// ioctl_fideduperange(2) man page for details.
	func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error {
	buf := make([]byte, SizeofRawFileDedupeRange+
	len(value.Info)*SizeofRawFileDedupeRangeInfo)
	rawrange := (*RawFileDedupeRange)(unsafe.Pointer(&buf[0]))
	rawrange.Src_offset = value.Src_offset
	rawrange.Src_length = value.Src_length
	rawrange.Dest_count = uint16(len(value.Info))
	rawrange.Reserved1 = value.Reserved1
	rawrange.Reserved2 = value.Reserved2

	for i := range value.Info {
	rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
	uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
	uintptr(i*SizeofRawFileDedupeRangeInfo)))
	rawinfo.Dest_fd = value.Info[i].Dest_fd
	rawinfo.Dest_offset = value.Info[i].Dest_offset
	rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped
	rawinfo.Status = value.Info[i].Status
	rawinfo.Reserved = value.Info[i].Reserved
	}

	err := ioctlPtr(srcFd, FIDEDUPERANGE, unsafe.Pointer(&buf[0]))

	// Output
	for i := range value.Info {
	rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
	uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
	uintptr(i*SizeofRawFileDedupeRangeInfo)))
	value.Info[i].Dest_fd = rawinfo.Dest_fd
	value.Info[i].Dest_offset = rawinfo.Dest_offset
	value.Info[i].Bytes_deduped = rawinfo.Bytes_deduped
	value.Info[i].Status = rawinfo.Status
	value.Info[i].Reserved = rawinfo.Reserved
	}

	return err
	}

	func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error {
	return ioctlPtr(fd, HIDIOCGRDESC, unsafe.Pointer(value))
	}

	func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) {
	var value HIDRawDevInfo
	err := ioctlPtr(fd, HIDIOCGRAWINFO, unsafe.Pointer(&value))
	return &value, err
	}

	func IoctlHIDGetRawName(fd int) (string, error) {
	var value [_HIDIOCGRAWNAME_LEN]byte
	err := ioctlPtr(fd, _HIDIOCGRAWNAME, unsafe.Pointer(&value[0]))
	return ByteSliceToString(value[:]), err
	}

	func IoctlHIDGetRawPhys(fd int) (string, error) {
	var value [_HIDIOCGRAWPHYS_LEN]byte
	err := ioctlPtr(fd, _HIDIOCGRAWPHYS, unsafe.Pointer(&value[0]))
	return ByteSliceToString(value[:]), err
	}

	func IoctlHIDGetRawUniq(fd int) (string, error) {
	var value [_HIDIOCGRAWUNIQ_LEN]byte
	err := ioctlPtr(fd, _HIDIOCGRAWUNIQ, unsafe.Pointer(&value[0]))
	return ByteSliceToString(value[:]), err
	}

	// IoctlIfreq performs an ioctl using an Ifreq structure for input and/or
	// output. See the netdevice(7) man page for details.
	func IoctlIfreq(fd int, req uint, value *Ifreq) error {
	// It is possible we will add more fields to *Ifreq itself later to prevent
	// misuse, so pass the raw *ifreq directly.
	return ioctlPtr(fd, req, unsafe.Pointer(&value.raw))
	}

	// TODO(mdlayher): export if and when IfreqData is exported.

	// ioctlIfreqData performs an ioctl using an ifreqData structure for input
	// and/or output. See the netdevice(7) man page for details.
	func ioctlIfreqData(fd int, req uint, value *ifreqData) error {
	// The memory layout of IfreqData (type-safe) and ifreq (not type-safe) are
	// identical so pass *IfreqData directly.
	return ioctlPtr(fd, req, unsafe.Pointer(value))
	}

	// IoctlKCMClone attaches a new file descriptor to a multiplexor by cloning an
	// existing KCM socket, returning a structure containing the file descriptor of
	// the new socket.
	func IoctlKCMClone(fd int) (*KCMClone, error) {
	var info KCMClone
	if err := ioctlPtr(fd, SIOCKCMCLONE, unsafe.Pointer(&info)); err != nil {
	return nil, err
	}

	return &info, nil
	}

	// IoctlKCMAttach attaches a TCP socket and associated BPF program file
	// descriptor to a multiplexor.
	func IoctlKCMAttach(fd int, info KCMAttach) error {
	return ioctlPtr(fd, SIOCKCMATTACH, unsafe.Pointer(&info))
	}

	// IoctlKCMUnattach unattaches a TCP socket file descriptor from a multiplexor.
	func IoctlKCMUnattach(fd int, info KCMUnattach) error {
	return ioctlPtr(fd, SIOCKCMUNATTACH, unsafe.Pointer(&info))
	}

	// IoctlLoopGetStatus64 gets the status of the loop device associated with the
	// file descriptor fd using the LOOP_GET_STATUS64 operation.
	func IoctlLoopGetStatus64(fd int) (*LoopInfo64, error) {
	var value LoopInfo64
	if err := ioctlPtr(fd, LOOP_GET_STATUS64, unsafe.Pointer(&value)); err != nil {
	return nil, err
	}
	return &value, nil
	}

	// IoctlLoopSetStatus64 sets the status of the loop device associated with the
	// file descriptor fd using the LOOP_SET_STATUS64 operation.
	func IoctlLoopSetStatus64(fd int, value *LoopInfo64) error {
	return ioctlPtr(fd, LOOP_SET_STATUS64, unsafe.Pointer(value))
	}

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