David K. Bainbridge | e05cf0c | 2021-08-19 03:16:50 +0000 | [diff] [blame] | 1 | // Copyright 2021 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package unix |
| 6 | |
| 7 | import ( |
| 8 | "runtime" |
| 9 | "unsafe" |
| 10 | ) |
| 11 | |
| 12 | // IoctlRetInt performs an ioctl operation specified by req on a device |
| 13 | // associated with opened file descriptor fd, and returns a non-negative |
| 14 | // integer that is returned by the ioctl syscall. |
| 15 | func IoctlRetInt(fd int, req uint) (int, error) { |
| 16 | ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0) |
| 17 | if err != 0 { |
| 18 | return 0, err |
| 19 | } |
| 20 | return int(ret), nil |
| 21 | } |
| 22 | |
| 23 | func IoctlGetUint32(fd int, req uint) (uint32, error) { |
| 24 | var value uint32 |
| 25 | err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) |
| 26 | return value, err |
| 27 | } |
| 28 | |
| 29 | func IoctlGetRTCTime(fd int) (*RTCTime, error) { |
| 30 | var value RTCTime |
| 31 | err := ioctl(fd, RTC_RD_TIME, uintptr(unsafe.Pointer(&value))) |
| 32 | return &value, err |
| 33 | } |
| 34 | |
| 35 | func IoctlSetRTCTime(fd int, value *RTCTime) error { |
| 36 | err := ioctl(fd, RTC_SET_TIME, uintptr(unsafe.Pointer(value))) |
| 37 | runtime.KeepAlive(value) |
| 38 | return err |
| 39 | } |
| 40 | |
| 41 | func IoctlGetRTCWkAlrm(fd int) (*RTCWkAlrm, error) { |
| 42 | var value RTCWkAlrm |
| 43 | err := ioctl(fd, RTC_WKALM_RD, uintptr(unsafe.Pointer(&value))) |
| 44 | return &value, err |
| 45 | } |
| 46 | |
| 47 | func IoctlSetRTCWkAlrm(fd int, value *RTCWkAlrm) error { |
| 48 | err := ioctl(fd, RTC_WKALM_SET, uintptr(unsafe.Pointer(value))) |
| 49 | runtime.KeepAlive(value) |
| 50 | return err |
| 51 | } |
| 52 | |
| 53 | type ifreqEthtool struct { |
| 54 | name [IFNAMSIZ]byte |
| 55 | data unsafe.Pointer |
| 56 | } |
| 57 | |
| 58 | // IoctlGetEthtoolDrvinfo fetches ethtool driver information for the network |
| 59 | // device specified by ifname. |
| 60 | func IoctlGetEthtoolDrvinfo(fd int, ifname string) (*EthtoolDrvinfo, error) { |
| 61 | // Leave room for terminating NULL byte. |
| 62 | if len(ifname) >= IFNAMSIZ { |
| 63 | return nil, EINVAL |
| 64 | } |
| 65 | |
| 66 | value := EthtoolDrvinfo{ |
| 67 | Cmd: ETHTOOL_GDRVINFO, |
| 68 | } |
| 69 | ifreq := ifreqEthtool{ |
| 70 | data: unsafe.Pointer(&value), |
| 71 | } |
| 72 | copy(ifreq.name[:], ifname) |
| 73 | err := ioctl(fd, SIOCETHTOOL, uintptr(unsafe.Pointer(&ifreq))) |
| 74 | runtime.KeepAlive(ifreq) |
| 75 | return &value, err |
| 76 | } |
| 77 | |
| 78 | // IoctlGetWatchdogInfo fetches information about a watchdog device from the |
| 79 | // Linux watchdog API. For more information, see: |
| 80 | // https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html. |
| 81 | func IoctlGetWatchdogInfo(fd int) (*WatchdogInfo, error) { |
| 82 | var value WatchdogInfo |
| 83 | err := ioctl(fd, WDIOC_GETSUPPORT, uintptr(unsafe.Pointer(&value))) |
| 84 | return &value, err |
| 85 | } |
| 86 | |
| 87 | // IoctlWatchdogKeepalive issues a keepalive ioctl to a watchdog device. For |
| 88 | // more information, see: |
| 89 | // https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html. |
| 90 | func IoctlWatchdogKeepalive(fd int) error { |
| 91 | return ioctl(fd, WDIOC_KEEPALIVE, 0) |
| 92 | } |
| 93 | |
| 94 | // IoctlFileCloneRange performs an FICLONERANGE ioctl operation to clone the |
| 95 | // range of data conveyed in value to the file associated with the file |
| 96 | // descriptor destFd. See the ioctl_ficlonerange(2) man page for details. |
| 97 | func IoctlFileCloneRange(destFd int, value *FileCloneRange) error { |
| 98 | err := ioctl(destFd, FICLONERANGE, uintptr(unsafe.Pointer(value))) |
| 99 | runtime.KeepAlive(value) |
| 100 | return err |
| 101 | } |
| 102 | |
| 103 | // IoctlFileClone performs an FICLONE ioctl operation to clone the entire file |
| 104 | // associated with the file description srcFd to the file associated with the |
| 105 | // file descriptor destFd. See the ioctl_ficlone(2) man page for details. |
| 106 | func IoctlFileClone(destFd, srcFd int) error { |
| 107 | return ioctl(destFd, FICLONE, uintptr(srcFd)) |
| 108 | } |
| 109 | |
| 110 | type FileDedupeRange struct { |
| 111 | Src_offset uint64 |
| 112 | Src_length uint64 |
| 113 | Reserved1 uint16 |
| 114 | Reserved2 uint32 |
| 115 | Info []FileDedupeRangeInfo |
| 116 | } |
| 117 | |
| 118 | type FileDedupeRangeInfo struct { |
| 119 | Dest_fd int64 |
| 120 | Dest_offset uint64 |
| 121 | Bytes_deduped uint64 |
| 122 | Status int32 |
| 123 | Reserved uint32 |
| 124 | } |
| 125 | |
| 126 | // IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the |
| 127 | // range of data conveyed in value from the file associated with the file |
| 128 | // descriptor srcFd to the value.Info destinations. See the |
| 129 | // ioctl_fideduperange(2) man page for details. |
| 130 | func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error { |
| 131 | buf := make([]byte, SizeofRawFileDedupeRange+ |
| 132 | len(value.Info)*SizeofRawFileDedupeRangeInfo) |
| 133 | rawrange := (*RawFileDedupeRange)(unsafe.Pointer(&buf[0])) |
| 134 | rawrange.Src_offset = value.Src_offset |
| 135 | rawrange.Src_length = value.Src_length |
| 136 | rawrange.Dest_count = uint16(len(value.Info)) |
| 137 | rawrange.Reserved1 = value.Reserved1 |
| 138 | rawrange.Reserved2 = value.Reserved2 |
| 139 | |
| 140 | for i := range value.Info { |
| 141 | rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer( |
| 142 | uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) + |
| 143 | uintptr(i*SizeofRawFileDedupeRangeInfo))) |
| 144 | rawinfo.Dest_fd = value.Info[i].Dest_fd |
| 145 | rawinfo.Dest_offset = value.Info[i].Dest_offset |
| 146 | rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped |
| 147 | rawinfo.Status = value.Info[i].Status |
| 148 | rawinfo.Reserved = value.Info[i].Reserved |
| 149 | } |
| 150 | |
| 151 | err := ioctl(srcFd, FIDEDUPERANGE, uintptr(unsafe.Pointer(&buf[0]))) |
| 152 | |
| 153 | // Output |
| 154 | for i := range value.Info { |
| 155 | rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer( |
| 156 | uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) + |
| 157 | uintptr(i*SizeofRawFileDedupeRangeInfo))) |
| 158 | value.Info[i].Dest_fd = rawinfo.Dest_fd |
| 159 | value.Info[i].Dest_offset = rawinfo.Dest_offset |
| 160 | value.Info[i].Bytes_deduped = rawinfo.Bytes_deduped |
| 161 | value.Info[i].Status = rawinfo.Status |
| 162 | value.Info[i].Reserved = rawinfo.Reserved |
| 163 | } |
| 164 | |
| 165 | return err |
| 166 | } |
| 167 | |
| 168 | func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error { |
| 169 | err := ioctl(fd, HIDIOCGRDESC, uintptr(unsafe.Pointer(value))) |
| 170 | runtime.KeepAlive(value) |
| 171 | return err |
| 172 | } |
| 173 | |
| 174 | func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) { |
| 175 | var value HIDRawDevInfo |
| 176 | err := ioctl(fd, HIDIOCGRAWINFO, uintptr(unsafe.Pointer(&value))) |
| 177 | return &value, err |
| 178 | } |
| 179 | |
| 180 | func IoctlHIDGetRawName(fd int) (string, error) { |
| 181 | var value [_HIDIOCGRAWNAME_LEN]byte |
| 182 | err := ioctl(fd, _HIDIOCGRAWNAME, uintptr(unsafe.Pointer(&value[0]))) |
| 183 | return ByteSliceToString(value[:]), err |
| 184 | } |
| 185 | |
| 186 | func IoctlHIDGetRawPhys(fd int) (string, error) { |
| 187 | var value [_HIDIOCGRAWPHYS_LEN]byte |
| 188 | err := ioctl(fd, _HIDIOCGRAWPHYS, uintptr(unsafe.Pointer(&value[0]))) |
| 189 | return ByteSliceToString(value[:]), err |
| 190 | } |
| 191 | |
| 192 | func IoctlHIDGetRawUniq(fd int) (string, error) { |
| 193 | var value [_HIDIOCGRAWUNIQ_LEN]byte |
| 194 | err := ioctl(fd, _HIDIOCGRAWUNIQ, uintptr(unsafe.Pointer(&value[0]))) |
| 195 | return ByteSliceToString(value[:]), err |
| 196 | } |