Documentation / ioctl / ioctl-number.txt
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Based on kernel version 3.9. Page generated on 2013-05-02 23:09 EST.
1 Ioctl Numbers 2 19 October 1999 3 Michael Elizabeth Chastain 4 <mec@shout.net> 5 6 If you are adding new ioctl's to the kernel, you should use the _IO 7 macros defined in <linux/ioctl.h>: 8 9 _IO an ioctl with no parameters 10 _IOW an ioctl with write parameters (copy_from_user) 11 _IOR an ioctl with read parameters (copy_to_user) 12 _IOWR an ioctl with both write and read parameters. 13 14 'Write' and 'read' are from the user's point of view, just like the 15 system calls 'write' and 'read'. For example, a SET_FOO ioctl would 16 be _IOW, although the kernel would actually read data from user space; 17 a GET_FOO ioctl would be _IOR, although the kernel would actually write 18 data to user space. 19 20 The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter 21 or number from the table below. Because of the large number of drivers, 22 many drivers share a partial letter with other drivers. 23 24 If you are writing a driver for a new device and need a letter, pick an 25 unused block with enough room for expansion: 32 to 256 ioctl commands. 26 You can register the block by patching this file and submitting the 27 patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and 28 I'll register one for you. 29 30 The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number 31 to distinguish ioctls from each other. The third argument to _IOW, 32 _IOR, or _IOWR is the type of the data going into the kernel or coming 33 out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use 34 sizeof(arg) as the third argument as this results in your ioctl thinking 35 it passes an argument of type size_t. 36 37 Some devices use their major number as the identifier; this is OK, as 38 long as it is unique. Some devices are irregular and don't follow any 39 convention at all. 40 41 Following this convention is good because: 42 43 (1) Keeping the ioctl's globally unique helps error checking: 44 if a program calls an ioctl on the wrong device, it will get an 45 error rather than some unexpected behaviour. 46 47 (2) The 'strace' build procedure automatically finds ioctl numbers 48 defined with _IO, _IOW, _IOR, or _IOWR. 49 50 (3) 'strace' can decode numbers back into useful names when the 51 numbers are unique. 52 53 (4) People looking for ioctls can grep for them more easily when 54 this convention is used to define the ioctl numbers. 55 56 (5) When following the convention, the driver code can use generic 57 code to copy the parameters between user and kernel space. 58 59 This table lists ioctls visible from user land for Linux/x86. It contains 60 most drivers up to 2.6.31, but I know I am missing some. There has been 61 no attempt to list non-X86 architectures or ioctls from drivers/staging/. 62 63 Code Seq#(hex) Include File Comments 64 ======================================================== 65 0x00 00-1F linux/fs.h conflict! 66 0x00 00-1F scsi/scsi_ioctl.h conflict! 67 0x00 00-1F linux/fb.h conflict! 68 0x00 00-1F linux/wavefront.h conflict! 69 0x02 all linux/fd.h 70 0x03 all linux/hdreg.h 71 0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these. 72 0x06 all linux/lp.h 73 0x09 all linux/raid/md_u.h 74 0x10 00-0F drivers/char/s390/vmcp.h 75 0x12 all linux/fs.h 76 linux/blkpg.h 77 0x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/> 78 0x20 all drivers/cdrom/cm206.h 79 0x22 all scsi/sg.h 80 '#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem 81 '$' 00-0F linux/perf_counter.h, linux/perf_event.h 82 '&' 00-07 drivers/firewire/nosy-user.h 83 '1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl 84 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> 85 '2' 01-04 linux/i2o.h 86 '3' 00-0F drivers/s390/char/raw3270.h conflict! 87 '3' 00-1F linux/suspend_ioctls.h conflict! 88 and kernel/power/user.c 89 '8' all SNP8023 advanced NIC card 90 <mailto:mcr@solidum.com> 91 ';' 64-7F linux/vfio.h 92 '@' 00-0F linux/radeonfb.h conflict! 93 '@' 00-0F drivers/video/aty/aty128fb.c conflict! 94 'A' 00-1F linux/apm_bios.h conflict! 95 'A' 00-0F linux/agpgart.h conflict! 96 and drivers/char/agp/compat_ioctl.h 97 'A' 00-7F sound/asound.h conflict! 98 'B' 00-1F linux/cciss_ioctl.h conflict! 99 'B' 00-0F include/linux/pmu.h conflict! 100 'B' C0-FF advanced bbus 101 <mailto:maassen@uni-freiburg.de> 102 'C' all linux/soundcard.h conflict! 103 'C' 01-2F linux/capi.h conflict! 104 'C' F0-FF drivers/net/wan/cosa.h conflict! 105 'D' all arch/s390/include/asm/dasd.h 106 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h 107 'D' 05 drivers/scsi/pmcraid.h 108 'E' all linux/input.h conflict! 109 'E' 00-0F xen/evtchn.h conflict! 110 'F' all linux/fb.h conflict! 111 'F' 01-02 drivers/scsi/pmcraid.h conflict! 112 'F' 20 drivers/video/fsl-diu-fb.h conflict! 113 'F' 20 drivers/video/intelfb/intelfb.h conflict! 114 'F' 20 linux/ivtvfb.h conflict! 115 'F' 20 linux/matroxfb.h conflict! 116 'F' 20 drivers/video/aty/atyfb_base.c conflict! 117 'F' 00-0F video/da8xx-fb.h conflict! 118 'F' 80-8F linux/arcfb.h conflict! 119 'F' DD video/sstfb.h conflict! 120 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict! 121 'G' 00-0F linux/gigaset_dev.h conflict! 122 'H' 00-7F linux/hiddev.h conflict! 123 'H' 00-0F linux/hidraw.h conflict! 124 'H' 01 linux/mei.h conflict! 125 'H' 00-0F sound/asound.h conflict! 126 'H' 20-40 sound/asound_fm.h conflict! 127 'H' 80-8F sound/sfnt_info.h conflict! 128 'H' 10-8F sound/emu10k1.h conflict! 129 'H' 10-1F sound/sb16_csp.h conflict! 130 'H' 10-1F sound/hda_hwdep.h conflict! 131 'H' 40-4F sound/hdspm.h conflict! 132 'H' 40-4F sound/hdsp.h conflict! 133 'H' 90 sound/usb/usx2y/usb_stream.h 134 'H' C0-F0 net/bluetooth/hci.h conflict! 135 'H' C0-DF net/bluetooth/hidp/hidp.h conflict! 136 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict! 137 'H' C0-DF net/bluetooth/bnep/bnep.h conflict! 138 'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net> 139 'I' all linux/isdn.h conflict! 140 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict! 141 'I' 40-4F linux/mISDNif.h conflict! 142 'J' 00-1F drivers/scsi/gdth_ioctl.h 143 'K' all linux/kd.h 144 'L' 00-1F linux/loop.h conflict! 145 'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict! 146 'L' E0-FF linux/ppdd.h encrypted disk device driver 147 <http://linux01.gwdg.de/~alatham/ppdd.html> 148 'M' all linux/soundcard.h conflict! 149 'M' 01-16 mtd/mtd-abi.h conflict! 150 and drivers/mtd/mtdchar.c 151 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h 152 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! 153 'N' 00-1F drivers/usb/scanner.h 154 'N' 40-7F drivers/block/nvme.c 155 'O' 00-06 mtd/ubi-user.h UBI 156 'P' all linux/soundcard.h conflict! 157 'P' 60-6F sound/sscape_ioctl.h conflict! 158 'P' 00-0F drivers/usb/class/usblp.c conflict! 159 'Q' all linux/soundcard.h 160 'R' 00-1F linux/random.h conflict! 161 'R' 01 linux/rfkill.h conflict! 162 'R' C0-DF net/bluetooth/rfcomm.h 163 'S' all linux/cdrom.h conflict! 164 'S' 80-81 scsi/scsi_ioctl.h conflict! 165 'S' 82-FF scsi/scsi.h conflict! 166 'S' 00-7F sound/asequencer.h conflict! 167 'T' all linux/soundcard.h conflict! 168 'T' 00-AF sound/asound.h conflict! 169 'T' all arch/x86/include/asm/ioctls.h conflict! 170 'T' C0-DF linux/if_tun.h conflict! 171 'U' all sound/asound.h conflict! 172 'U' 00-CF linux/uinput.h conflict! 173 'U' 00-EF linux/usbdevice_fs.h 174 'U' C0-CF drivers/bluetooth/hci_uart.h 175 'V' all linux/vt.h conflict! 176 'V' all linux/videodev2.h conflict! 177 'V' C0 linux/ivtvfb.h conflict! 178 'V' C0 linux/ivtv.h conflict! 179 'V' C0 media/davinci/vpfe_capture.h conflict! 180 'V' C0 media/si4713.h conflict! 181 'W' 00-1F linux/watchdog.h conflict! 182 'W' 00-1F linux/wanrouter.h conflict! (pre 3.9) 183 'W' 00-3F sound/asound.h conflict! 184 'X' all fs/xfs/xfs_fs.h conflict! 185 and fs/xfs/linux-2.6/xfs_ioctl32.h 186 and include/linux/falloc.h 187 and linux/fs.h 188 'X' all fs/ocfs2/ocfs_fs.h conflict! 189 'X' 01 linux/pktcdvd.h conflict! 190 'Y' all linux/cyclades.h 191 'Z' 14-15 drivers/message/fusion/mptctl.h 192 '[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices 193 <mailto:gregkh@linuxfoundation.org> 194 'a' all linux/atm*.h, linux/sonet.h ATM on linux 195 <http://lrcwww.epfl.ch/> 196 'b' 00-FF conflict! bit3 vme host bridge 197 <mailto:natalia@nikhefk.nikhef.nl> 198 'c' all linux/cm4000_cs.h conflict! 199 'c' 00-7F linux/comstats.h conflict! 200 'c' 00-7F linux/coda.h conflict! 201 'c' 00-1F linux/chio.h conflict! 202 'c' 80-9F arch/s390/include/asm/chsc.h conflict! 203 'c' A0-AF arch/x86/include/asm/msr.h conflict! 204 'd' 00-FF linux/char/drm/drm/h conflict! 205 'd' 02-40 pcmcia/ds.h conflict! 206 'd' F0-FF linux/digi1.h 207 'e' all linux/digi1.h conflict! 208 'e' 00-1F drivers/net/irda/irtty-sir.h conflict! 209 'f' 00-1F linux/ext2_fs.h conflict! 210 'f' 00-1F linux/ext3_fs.h conflict! 211 'f' 00-0F fs/jfs/jfs_dinode.h conflict! 212 'f' 00-0F fs/ext4/ext4.h conflict! 213 'f' 00-0F linux/fs.h conflict! 214 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict! 215 'g' 00-0F linux/usb/gadgetfs.h 216 'g' 20-2F linux/usb/g_printer.h 217 'h' 00-7F conflict! Charon filesystem 218 <mailto:zapman@interlan.net> 219 'h' 00-1F linux/hpet.h conflict! 220 'h' 80-8F fs/hfsplus/ioctl.c 221 'i' 00-3F linux/i2o-dev.h conflict! 222 'i' 0B-1F linux/ipmi.h conflict! 223 'i' 80-8F linux/i8k.h 224 'j' 00-3F linux/joystick.h 225 'k' 00-0F linux/spi/spidev.h conflict! 226 'k' 00-05 video/kyro.h conflict! 227 'k' 10-17 linux/hsi/hsi_char.h HSI character device 228 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system 229 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs> 230 'l' 40-7F linux/udf_fs_i.h in development: 231 <http://sourceforge.net/projects/linux-udf/> 232 'm' 00-09 linux/mmtimer.h conflict! 233 'm' all linux/mtio.h conflict! 234 'm' all linux/soundcard.h conflict! 235 'm' all linux/synclink.h conflict! 236 'm' 00-19 drivers/message/fusion/mptctl.h conflict! 237 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict! 238 'm' 00-1F net/irda/irmod.h conflict! 239 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c 240 'n' 80-8F linux/nilfs2_fs.h NILFS2 241 'n' E0-FF linux/matroxfb.h matroxfb 242 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2 243 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps) 244 'o' 40-41 mtd/ubi-user.h UBI 245 'o' 01-A1 linux/dvb/*.h DVB 246 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this) 247 'p' 00-1F linux/rtc.h conflict! 248 'p' 00-3F linux/mc146818rtc.h conflict! 249 'p' 40-7F linux/nvram.h 250 'p' 80-9F linux/ppdev.h user-space parport 251 <mailto:tim@cyberelk.net> 252 'p' A1-A5 linux/pps.h LinuxPPS 253 <mailto:giometti@linux.it> 254 'q' 00-1F linux/serio.h 255 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK 256 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net> 257 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c 258 's' all linux/cdk.h 259 't' 00-7F linux/ppp-ioctl.h 260 't' 80-8F linux/isdn_ppp.h 261 't' 90 linux/toshiba.h 262 'u' 00-1F linux/smb_fs.h gone 263 'u' 20-3F linux/uvcvideo.h USB video class host driver 264 'v' 00-1F linux/ext2_fs.h conflict! 265 'v' 00-1F linux/fs.h conflict! 266 'v' 00-0F linux/sonypi.h conflict! 267 'v' C0-FF linux/meye.h conflict! 268 'w' all CERN SCI driver 269 'y' 00-1F packet based user level communications 270 <mailto:zapman@interlan.net> 271 'z' 00-3F CAN bus card conflict! 272 <mailto:hdstich@connectu.ulm.circular.de> 273 'z' 40-7F CAN bus card conflict! 274 <mailto:oe@port.de> 275 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict! 276 '|' 00-7F linux/media.h 277 0x80 00-1F linux/fb.h 278 0x89 00-06 arch/x86/include/asm/sockios.h 279 0x89 0B-DF linux/sockios.h 280 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range 281 0x89 E0-EF linux/dn.h PROTOPRIVATE range 282 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range 283 0x8B all linux/wireless.h 284 0x8C 00-3F WiNRADiO driver 285 <http://www.winradio.com.au/> 286 0x90 00 drivers/cdrom/sbpcd.h 287 0x92 00-0F drivers/usb/mon/mon_bin.c 288 0x93 60-7F linux/auto_fs.h 289 0x94 all fs/btrfs/ioctl.h 290 0x97 00-7F fs/ceph/ioctl.h Ceph file system 291 0x99 00-0F 537-Addinboard driver 292 <mailto:buk@buks.ipn.de> 293 0xA0 all linux/sdp/sdp.h Industrial Device Project 294 <mailto:kenji@bitgate.com> 295 0xA2 00-0F arch/tile/include/asm/hardwall.h 296 0xA3 80-8F Port ACL in development: 297 <mailto:tlewis@mindspring.com> 298 0xA3 90-9F linux/dtlk.h 299 0xAB 00-1F linux/nbd.h 300 0xAC 00-1F linux/raw.h 301 0xAD 00 Netfilter device in development: 302 <mailto:rusty@rustcorp.com.au> 303 0xAE all linux/kvm.h Kernel-based Virtual Machine 304 <mailto:kvm@vger.kernel.org> 305 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor 306 0xB0 all RATIO devices in development: 307 <mailto:vgo@ratio.de> 308 0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca> 309 0xB3 00 linux/mmc/ioctl.h 310 0xC0 00-0F linux/usb/iowarrior.h 311 0xCB 00-1F CBM serial IEC bus in development: 312 <mailto:michael.klein@puffin.lb.shuttle.de> 313 0xCD 01 linux/reiserfs_fs.h 314 0xCF 02 fs/cifs/ioctl.c 315 0xDB 00-0F drivers/char/mwave/mwavepub.h 316 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ 317 <mailto:aherrman@de.ibm.com> 318 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development) 319 <mailto:thomas@winischhofer.net> 320 0xF4 00-1F video/mbxfb.h mbxfb 321 <mailto:raph@8d.com> 322 0xF6 all LTTng Linux Trace Toolkit Next Generation 323 <mailto:mathieu.desnoyers@efficios.com> 324 0xFD all linux/dm-ioctl.h
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