197 lines
6.5 KiB
Go
197 lines
6.5 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package unix
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import (
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"unsafe"
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)
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// IoctlRetInt performs an ioctl operation specified by req on a device
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// associated with opened file descriptor fd, and returns a non-negative
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// integer that is returned by the ioctl syscall.
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func IoctlRetInt(fd int, req uint) (int, error) {
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ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0)
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if err != 0 {
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return 0, err
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}
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return int(ret), nil
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}
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func IoctlGetUint32(fd int, req uint) (uint32, error) {
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var value uint32
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err := ioctlPtr(fd, req, unsafe.Pointer(&value))
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return value, err
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}
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func IoctlGetRTCTime(fd int) (*RTCTime, error) {
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var value RTCTime
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err := ioctlPtr(fd, RTC_RD_TIME, unsafe.Pointer(&value))
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return &value, err
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}
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func IoctlSetRTCTime(fd int, value *RTCTime) error {
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return ioctlPtr(fd, RTC_SET_TIME, unsafe.Pointer(value))
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}
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func IoctlGetRTCWkAlrm(fd int) (*RTCWkAlrm, error) {
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var value RTCWkAlrm
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err := ioctlPtr(fd, RTC_WKALM_RD, unsafe.Pointer(&value))
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return &value, err
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}
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func IoctlSetRTCWkAlrm(fd int, value *RTCWkAlrm) error {
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return ioctlPtr(fd, RTC_WKALM_SET, unsafe.Pointer(value))
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}
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// IoctlGetEthtoolDrvinfo fetches ethtool driver information for the network
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// device specified by ifname.
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func IoctlGetEthtoolDrvinfo(fd int, ifname string) (*EthtoolDrvinfo, error) {
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ifr, err := NewIfreq(ifname)
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if err != nil {
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return nil, err
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}
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value := EthtoolDrvinfo{Cmd: ETHTOOL_GDRVINFO}
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ifrd := ifr.withData(unsafe.Pointer(&value))
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err = ioctlIfreqData(fd, SIOCETHTOOL, &ifrd)
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return &value, err
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}
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// IoctlGetWatchdogInfo fetches information about a watchdog device from the
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// Linux watchdog API. For more information, see:
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// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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func IoctlGetWatchdogInfo(fd int) (*WatchdogInfo, error) {
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var value WatchdogInfo
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err := ioctlPtr(fd, WDIOC_GETSUPPORT, unsafe.Pointer(&value))
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return &value, err
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}
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// IoctlWatchdogKeepalive issues a keepalive ioctl to a watchdog device. For
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// more information, see:
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// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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func IoctlWatchdogKeepalive(fd int) error {
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// arg is ignored and not a pointer, so ioctl is fine instead of ioctlPtr.
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return ioctl(fd, WDIOC_KEEPALIVE, 0)
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}
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// IoctlFileCloneRange performs an FICLONERANGE ioctl operation to clone the
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// range of data conveyed in value to the file associated with the file
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// descriptor destFd. See the ioctl_ficlonerange(2) man page for details.
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func IoctlFileCloneRange(destFd int, value *FileCloneRange) error {
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return ioctlPtr(destFd, FICLONERANGE, unsafe.Pointer(value))
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}
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// IoctlFileClone performs an FICLONE ioctl operation to clone the entire file
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// associated with the file description srcFd to the file associated with the
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// file descriptor destFd. See the ioctl_ficlone(2) man page for details.
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func IoctlFileClone(destFd, srcFd int) error {
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return ioctl(destFd, FICLONE, uintptr(srcFd))
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}
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type FileDedupeRange struct {
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Src_offset uint64
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Src_length uint64
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Reserved1 uint16
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Reserved2 uint32
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Info []FileDedupeRangeInfo
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}
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type FileDedupeRangeInfo struct {
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Dest_fd int64
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Dest_offset uint64
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Bytes_deduped uint64
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Status int32
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Reserved uint32
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}
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// IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the
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// range of data conveyed in value from the file associated with the file
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// descriptor srcFd to the value.Info destinations. See the
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// ioctl_fideduperange(2) man page for details.
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func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error {
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buf := make([]byte, SizeofRawFileDedupeRange+
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len(value.Info)*SizeofRawFileDedupeRangeInfo)
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rawrange := (*RawFileDedupeRange)(unsafe.Pointer(&buf[0]))
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rawrange.Src_offset = value.Src_offset
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rawrange.Src_length = value.Src_length
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rawrange.Dest_count = uint16(len(value.Info))
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rawrange.Reserved1 = value.Reserved1
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rawrange.Reserved2 = value.Reserved2
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for i := range value.Info {
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rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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uintptr(i*SizeofRawFileDedupeRangeInfo)))
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rawinfo.Dest_fd = value.Info[i].Dest_fd
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rawinfo.Dest_offset = value.Info[i].Dest_offset
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rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped
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rawinfo.Status = value.Info[i].Status
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rawinfo.Reserved = value.Info[i].Reserved
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}
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err := ioctlPtr(srcFd, FIDEDUPERANGE, unsafe.Pointer(&buf[0]))
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// Output
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for i := range value.Info {
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rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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uintptr(i*SizeofRawFileDedupeRangeInfo)))
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value.Info[i].Dest_fd = rawinfo.Dest_fd
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value.Info[i].Dest_offset = rawinfo.Dest_offset
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value.Info[i].Bytes_deduped = rawinfo.Bytes_deduped
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value.Info[i].Status = rawinfo.Status
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value.Info[i].Reserved = rawinfo.Reserved
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}
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return err
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}
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func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error {
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return ioctlPtr(fd, HIDIOCGRDESC, unsafe.Pointer(value))
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}
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func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) {
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var value HIDRawDevInfo
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err := ioctlPtr(fd, HIDIOCGRAWINFO, unsafe.Pointer(&value))
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return &value, err
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}
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func IoctlHIDGetRawName(fd int) (string, error) {
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var value [_HIDIOCGRAWNAME_LEN]byte
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err := ioctlPtr(fd, _HIDIOCGRAWNAME, unsafe.Pointer(&value[0]))
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return ByteSliceToString(value[:]), err
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}
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func IoctlHIDGetRawPhys(fd int) (string, error) {
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var value [_HIDIOCGRAWPHYS_LEN]byte
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err := ioctlPtr(fd, _HIDIOCGRAWPHYS, unsafe.Pointer(&value[0]))
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return ByteSliceToString(value[:]), err
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}
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func IoctlHIDGetRawUniq(fd int) (string, error) {
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var value [_HIDIOCGRAWUNIQ_LEN]byte
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err := ioctlPtr(fd, _HIDIOCGRAWUNIQ, unsafe.Pointer(&value[0]))
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return ByteSliceToString(value[:]), err
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}
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// IoctlIfreq performs an ioctl using an Ifreq structure for input and/or
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// output. See the netdevice(7) man page for details.
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func IoctlIfreq(fd int, req uint, value *Ifreq) error {
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// It is possible we will add more fields to *Ifreq itself later to prevent
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// misuse, so pass the raw *ifreq directly.
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return ioctlPtr(fd, req, unsafe.Pointer(&value.raw))
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}
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// TODO(mdlayher): export if and when IfreqData is exported.
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// ioctlIfreqData performs an ioctl using an ifreqData structure for input
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// and/or output. See the netdevice(7) man page for details.
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func ioctlIfreqData(fd int, req uint, value *ifreqData) error {
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// The memory layout of IfreqData (type-safe) and ifreq (not type-safe) are
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// identical so pass *IfreqData directly.
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return ioctlPtr(fd, req, unsafe.Pointer(value))
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}
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