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1 // Copyright 2021 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 package unix
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6
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7 import (
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8 "unsafe"
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9 )
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10
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11 // IoctlRetInt performs an ioctl operation specified by req on a device
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12 // associated with opened file descriptor fd, and returns a non-negative
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13 // integer that is returned by the ioctl syscall.
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14 func IoctlRetInt(fd int, req uint) (int, error) {
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15 ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0)
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16 if err != 0 {
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17 return 0, err
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18 }
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19 return int(ret), nil
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20 }
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21
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22 func IoctlGetUint32(fd int, req uint) (uint32, error) {
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23 var value uint32
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24 err := ioctlPtr(fd, req, unsafe.Pointer(&value))
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25 return value, err
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26 }
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27
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28 func IoctlGetRTCTime(fd int) (*RTCTime, error) {
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29 var value RTCTime
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30 err := ioctlPtr(fd, RTC_RD_TIME, unsafe.Pointer(&value))
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31 return &value, err
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32 }
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33
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34 func IoctlSetRTCTime(fd int, value *RTCTime) error {
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35 return ioctlPtr(fd, RTC_SET_TIME, unsafe.Pointer(value))
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36 }
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37
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38 func IoctlGetRTCWkAlrm(fd int) (*RTCWkAlrm, error) {
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39 var value RTCWkAlrm
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40 err := ioctlPtr(fd, RTC_WKALM_RD, unsafe.Pointer(&value))
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41 return &value, err
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42 }
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43
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44 func IoctlSetRTCWkAlrm(fd int, value *RTCWkAlrm) error {
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45 return ioctlPtr(fd, RTC_WKALM_SET, unsafe.Pointer(value))
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46 }
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47
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48 // IoctlGetEthtoolDrvinfo fetches ethtool driver information for the network
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49 // device specified by ifname.
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50 func IoctlGetEthtoolDrvinfo(fd int, ifname string) (*EthtoolDrvinfo, error) {
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51 ifr, err := NewIfreq(ifname)
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52 if err != nil {
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53 return nil, err
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54 }
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55
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56 value := EthtoolDrvinfo{Cmd: ETHTOOL_GDRVINFO}
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57 ifrd := ifr.withData(unsafe.Pointer(&value))
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58
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59 err = ioctlIfreqData(fd, SIOCETHTOOL, &ifrd)
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60 return &value, err
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61 }
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62
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63 // IoctlGetWatchdogInfo fetches information about a watchdog device from the
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64 // Linux watchdog API. For more information, see:
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65 // https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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66 func IoctlGetWatchdogInfo(fd int) (*WatchdogInfo, error) {
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67 var value WatchdogInfo
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68 err := ioctlPtr(fd, WDIOC_GETSUPPORT, unsafe.Pointer(&value))
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69 return &value, err
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70 }
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71
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72 // IoctlWatchdogKeepalive issues a keepalive ioctl to a watchdog device. For
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73 // more information, see:
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74 // https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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75 func IoctlWatchdogKeepalive(fd int) error {
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76 // arg is ignored and not a pointer, so ioctl is fine instead of ioctlPtr.
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77 return ioctl(fd, WDIOC_KEEPALIVE, 0)
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78 }
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79
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80 // IoctlFileCloneRange performs an FICLONERANGE ioctl operation to clone the
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81 // range of data conveyed in value to the file associated with the file
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82 // descriptor destFd. See the ioctl_ficlonerange(2) man page for details.
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83 func IoctlFileCloneRange(destFd int, value *FileCloneRange) error {
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84 return ioctlPtr(destFd, FICLONERANGE, unsafe.Pointer(value))
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85 }
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86
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87 // IoctlFileClone performs an FICLONE ioctl operation to clone the entire file
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88 // associated with the file description srcFd to the file associated with the
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89 // file descriptor destFd. See the ioctl_ficlone(2) man page for details.
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90 func IoctlFileClone(destFd, srcFd int) error {
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91 return ioctl(destFd, FICLONE, uintptr(srcFd))
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92 }
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93
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94 type FileDedupeRange struct {
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95 Src_offset uint64
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96 Src_length uint64
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97 Reserved1 uint16
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98 Reserved2 uint32
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99 Info []FileDedupeRangeInfo
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100 }
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101
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102 type FileDedupeRangeInfo struct {
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103 Dest_fd int64
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104 Dest_offset uint64
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105 Bytes_deduped uint64
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106 Status int32
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107 Reserved uint32
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108 }
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109
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110 // IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the
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111 // range of data conveyed in value from the file associated with the file
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112 // descriptor srcFd to the value.Info destinations. See the
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113 // ioctl_fideduperange(2) man page for details.
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114 func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error {
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115 buf := make([]byte, SizeofRawFileDedupeRange+
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116 len(value.Info)*SizeofRawFileDedupeRangeInfo)
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117 rawrange := (*RawFileDedupeRange)(unsafe.Pointer(&buf[0]))
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118 rawrange.Src_offset = value.Src_offset
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119 rawrange.Src_length = value.Src_length
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120 rawrange.Dest_count = uint16(len(value.Info))
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121 rawrange.Reserved1 = value.Reserved1
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122 rawrange.Reserved2 = value.Reserved2
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123
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124 for i := range value.Info {
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125 rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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126 uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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127 uintptr(i*SizeofRawFileDedupeRangeInfo)))
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128 rawinfo.Dest_fd = value.Info[i].Dest_fd
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129 rawinfo.Dest_offset = value.Info[i].Dest_offset
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130 rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped
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131 rawinfo.Status = value.Info[i].Status
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132 rawinfo.Reserved = value.Info[i].Reserved
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133 }
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134
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135 err := ioctlPtr(srcFd, FIDEDUPERANGE, unsafe.Pointer(&buf[0]))
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136
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137 // Output
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138 for i := range value.Info {
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139 rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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140 uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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141 uintptr(i*SizeofRawFileDedupeRangeInfo)))
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142 value.Info[i].Dest_fd = rawinfo.Dest_fd
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143 value.Info[i].Dest_offset = rawinfo.Dest_offset
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144 value.Info[i].Bytes_deduped = rawinfo.Bytes_deduped
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145 value.Info[i].Status = rawinfo.Status
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146 value.Info[i].Reserved = rawinfo.Reserved
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147 }
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148
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149 return err
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150 }
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151
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152 func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error {
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153 return ioctlPtr(fd, HIDIOCGRDESC, unsafe.Pointer(value))
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154 }
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155
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156 func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) {
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157 var value HIDRawDevInfo
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158 err := ioctlPtr(fd, HIDIOCGRAWINFO, unsafe.Pointer(&value))
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159 return &value, err
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160 }
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161
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162 func IoctlHIDGetRawName(fd int) (string, error) {
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163 var value [_HIDIOCGRAWNAME_LEN]byte
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164 err := ioctlPtr(fd, _HIDIOCGRAWNAME, unsafe.Pointer(&value[0]))
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165 return ByteSliceToString(value[:]), err
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166 }
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167
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168 func IoctlHIDGetRawPhys(fd int) (string, error) {
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169 var value [_HIDIOCGRAWPHYS_LEN]byte
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170 err := ioctlPtr(fd, _HIDIOCGRAWPHYS, unsafe.Pointer(&value[0]))
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171 return ByteSliceToString(value[:]), err
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172 }
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173
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174 func IoctlHIDGetRawUniq(fd int) (string, error) {
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175 var value [_HIDIOCGRAWUNIQ_LEN]byte
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176 err := ioctlPtr(fd, _HIDIOCGRAWUNIQ, unsafe.Pointer(&value[0]))
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177 return ByteSliceToString(value[:]), err
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178 }
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179
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180 // IoctlIfreq performs an ioctl using an Ifreq structure for input and/or
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181 // output. See the netdevice(7) man page for details.
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182 func IoctlIfreq(fd int, req uint, value *Ifreq) error {
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183 // It is possible we will add more fields to *Ifreq itself later to prevent
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184 // misuse, so pass the raw *ifreq directly.
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185 return ioctlPtr(fd, req, unsafe.Pointer(&value.raw))
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186 }
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187
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188 // TODO(mdlayher): export if and when IfreqData is exported.
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189
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190 // ioctlIfreqData performs an ioctl using an ifreqData structure for input
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191 // and/or output. See the netdevice(7) man page for details.
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192 func ioctlIfreqData(fd int, req uint, value *ifreqData) error {
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193 // The memory layout of IfreqData (type-safe) and ifreq (not type-safe) are
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194 // identical so pass *IfreqData directly.
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195 return ioctlPtr(fd, req, unsafe.Pointer(value))
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196 }
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197
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198 // IoctlKCMClone attaches a new file descriptor to a multiplexor by cloning an
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199 // existing KCM socket, returning a structure containing the file descriptor of
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200 // the new socket.
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201 func IoctlKCMClone(fd int) (*KCMClone, error) {
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202 var info KCMClone
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203 if err := ioctlPtr(fd, SIOCKCMCLONE, unsafe.Pointer(&info)); err != nil {
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204 return nil, err
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205 }
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206
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207 return &info, nil
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208 }
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209
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210 // IoctlKCMAttach attaches a TCP socket and associated BPF program file
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211 // descriptor to a multiplexor.
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212 func IoctlKCMAttach(fd int, info KCMAttach) error {
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213 return ioctlPtr(fd, SIOCKCMATTACH, unsafe.Pointer(&info))
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214 }
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215
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216 // IoctlKCMUnattach unattaches a TCP socket file descriptor from a multiplexor.
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217 func IoctlKCMUnattach(fd int, info KCMUnattach) error {
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218 return ioctlPtr(fd, SIOCKCMUNATTACH, unsafe.Pointer(&info))
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219 }
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