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1Ioctl Numbers
219 October 1999
3Michael Elizabeth Chastain
4<mec@shout.net>
5
6If you are adding new ioctl's to the kernel, you should use the _IO
7macros 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
15system calls 'write' and 'read'. For example, a SET_FOO ioctl would
16be _IOW, although the kernel would actually read data from user space;
17a GET_FOO ioctl would be _IOR, although the kernel would actually write
18data to user space.
19
20The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
21or number from the table below. Because of the large number of drivers,
22many drivers share a partial letter with other drivers.
23
24If you are writing a driver for a new device and need a letter, pick an
25unused block with enough room for expansion: 32 to 256 ioctl commands.
26You can register the block by patching this file and submitting the
27patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
28I'll register one for you.
29
30The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
31to 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
33out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
34sizeof(arg) as the third argument as this results in your ioctl thinking
35it passes an argument of type size_t.
36
37Some devices use their major number as the identifier; this is OK, as
38long as it is unique. Some devices are irregular and don't follow any
39convention at all.
40
41Following 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
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59This table lists ioctls visible from user land for Linux/x86. It contains
60most drivers up to 2.6.31, but I know I am missing some. There has been
61no attempt to list non-X86 architectures or ioctls from drivers/staging/.
1da177e4 62
cb5a8b2c 63Code Seq#(hex) Include File Comments
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64========================================================
650x00 00-1F linux/fs.h conflict!
660x00 00-1F scsi/scsi_ioctl.h conflict!
670x00 00-1F linux/fb.h conflict!
680x00 00-1F linux/wavefront.h conflict!
690x02 all linux/fd.h
700x03 all linux/hdreg.h
d5298802 710x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
1da177e4 720x06 all linux/lp.h
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730x09 all linux/raid/md_u.h
740x10 00-0F drivers/char/s390/vmcp.h
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750x12 all linux/fs.h
76 linux/blkpg.h
0ea6e611 770x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
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780x20 all drivers/cdrom/cm206.h
790x22 all scsi/sg.h
80'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 81'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 82'&' 00-07 drivers/firewire/nosy-user.h
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83'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
84 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
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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
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89'8' all SNP8023 advanced NIC card
90 <mailto:mcr@solidum.com>
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91'@' 00-0F linux/radeonfb.h conflict!
92'@' 00-0F drivers/video/aty/aty128fb.c conflict!
93'A' 00-1F linux/apm_bios.h conflict!
94'A' 00-0F linux/agpgart.h conflict!
95 and drivers/char/agp/compat_ioctl.h
96'A' 00-7F sound/asound.h conflict!
97'B' 00-1F linux/cciss_ioctl.h conflict!
98'B' 00-0F include/linux/pmu.h conflict!
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99'B' C0-FF advanced bbus
100 <mailto:maassen@uni-freiburg.de>
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101'C' all linux/soundcard.h conflict!
102'C' 01-2F linux/capi.h conflict!
103'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 104'D' all arch/s390/include/asm/dasd.h
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105'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
106'D' 05 drivers/scsi/pmcraid.h
107'E' all linux/input.h conflict!
108'E' 00-0F xen/evtchn.h conflict!
109'F' all linux/fb.h conflict!
110'F' 01-02 drivers/scsi/pmcraid.h conflict!
111'F' 20 drivers/video/fsl-diu-fb.h conflict!
112'F' 20 drivers/video/intelfb/intelfb.h conflict!
113'F' 20 linux/ivtvfb.h conflict!
114'F' 20 linux/matroxfb.h conflict!
115'F' 20 drivers/video/aty/atyfb_base.c conflict!
116'F' 00-0F video/da8xx-fb.h conflict!
117'F' 80-8F linux/arcfb.h conflict!
118'F' DD video/sstfb.h conflict!
119'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
120'G' 00-0F linux/gigaset_dev.h conflict!
121'H' 00-7F linux/hiddev.h conflict!
122'H' 00-0F linux/hidraw.h conflict!
123'H' 00-0F sound/asound.h conflict!
124'H' 20-40 sound/asound_fm.h conflict!
125'H' 80-8F sound/sfnt_info.h conflict!
126'H' 10-8F sound/emu10k1.h conflict!
127'H' 10-1F sound/sb16_csp.h conflict!
128'H' 10-1F sound/hda_hwdep.h conflict!
129'H' 40-4F sound/hdspm.h conflict!
130'H' 40-4F sound/hdsp.h conflict!
131'H' 90 sound/usb/usx2y/usb_stream.h
132'H' C0-F0 net/bluetooth/hci.h conflict!
133'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
134'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
135'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 136'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
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137'I' all linux/isdn.h conflict!
138'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
139'I' 40-4F linux/mISDNif.h conflict!
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140'J' 00-1F drivers/scsi/gdth_ioctl.h
141'K' all linux/kd.h
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142'L' 00-1F linux/loop.h conflict!
143'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
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144'L' E0-FF linux/ppdd.h encrypted disk device driver
145 <http://linux01.gwdg.de/~alatham/ppdd.html>
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146'M' all linux/soundcard.h conflict!
147'M' 01-16 mtd/mtd-abi.h conflict!
148 and drivers/mtd/mtdchar.c
149'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
150'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 151'N' 00-1F drivers/usb/scanner.h
b60503ba 152'N' 40-7F drivers/block/nvme.c
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153'O' 00-06 mtd/ubi-user.h UBI
154'P' all linux/soundcard.h conflict!
155'P' 60-6F sound/sscape_ioctl.h conflict!
156'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 157'Q' all linux/soundcard.h
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158'R' 00-1F linux/random.h conflict!
159'R' 01 linux/rfkill.h conflict!
cb5a8b2c 160'R' C0-DF net/bluetooth/rfcomm.h
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161'S' all linux/cdrom.h conflict!
162'S' 80-81 scsi/scsi_ioctl.h conflict!
163'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 164'S' 00-7F sound/asequencer.h conflict!
1da177e4 165'T' all linux/soundcard.h conflict!
cb5a8b2c 166'T' 00-AF sound/asound.h conflict!
07983f0e 167'T' all arch/x86/include/asm/ioctls.h conflict!
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168'T' C0-DF linux/if_tun.h conflict!
169'U' all sound/asound.h conflict!
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170'U' 00-CF linux/uinput.h conflict!
171'U' 00-EF linux/usbdevice_fs.h
172'U' C0-CF drivers/bluetooth/hci_uart.h
173'V' all linux/vt.h conflict!
174'V' all linux/videodev2.h conflict!
175'V' C0 linux/ivtvfb.h conflict!
176'V' C0 linux/ivtv.h conflict!
177'V' C0 media/davinci/vpfe_capture.h conflict!
178'V' C0 media/si4713.h conflict!
179'V' C0-CF drivers/media/video/mxb.h conflict!
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180'W' 00-1F linux/watchdog.h conflict!
181'W' 00-1F linux/wanrouter.h conflict!
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182'W' 00-3F sound/asound.h conflict!
183'X' all fs/xfs/xfs_fs.h conflict!
184 and fs/xfs/linux-2.6/xfs_ioctl32.h
185 and include/linux/falloc.h
186 and linux/fs.h
187'X' all fs/ocfs2/ocfs_fs.h conflict!
188'X' 01 linux/pktcdvd.h conflict!
1da177e4 189'Y' all linux/cyclades.h
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190'Z' 14-15 drivers/message/fusion/mptctl.h
191'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
5b775f67 192 <mailto:gregkh@suse.de>
cb5a8b2c 193'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 194 <http://lrcwww.epfl.ch/>
cb5a8b2c 195'b' 00-FF conflict! bit3 vme host bridge
1da177e4 196 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 197'c' all linux/cm4000_cs.h conflict!
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198'c' 00-7F linux/comstats.h conflict!
199'c' 00-7F linux/coda.h conflict!
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200'c' 00-1F linux/chio.h conflict!
201'c' 80-9F arch/s390/include/asm/chsc.h conflict!
202'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 203'd' 00-FF linux/char/drm/drm/h conflict!
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204'd' 02-40 pcmcia/ds.h conflict!
205'd' 10-3F drivers/media/video/dabusb.h conflict!
206'd' C0-CF drivers/media/video/saa7191.h conflict!
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207'd' F0-FF linux/digi1.h
208'e' all linux/digi1.h conflict!
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209'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
210'f' 00-1F linux/ext2_fs.h conflict!
211'f' 00-1F linux/ext3_fs.h conflict!
212'f' 00-0F fs/jfs/jfs_dinode.h conflict!
213'f' 00-0F fs/ext4/ext4.h conflict!
214'f' 00-0F linux/fs.h conflict!
215'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
216'g' 00-0F linux/usb/gadgetfs.h
217'g' 20-2F linux/usb/g_printer.h
218'h' 00-7F conflict! Charon filesystem
1da177e4 219 <mailto:zapman@interlan.net>
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220'h' 00-1F linux/hpet.h conflict!
221'i' 00-3F linux/i2o-dev.h conflict!
222'i' 0B-1F linux/ipmi.h conflict!
223'i' 80-8F linux/i8k.h
1da177e4 224'j' 00-3F linux/joystick.h
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225'k' 00-0F linux/spi/spidev.h conflict!
226'k' 00-05 video/kyro.h conflict!
1da177e4 227'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 228 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 229'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 230 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 231'm' 00-09 linux/mmtimer.h conflict!
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232'm' all linux/mtio.h conflict!
233'm' all linux/soundcard.h conflict!
234'm' all linux/synclink.h conflict!
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235'm' 00-19 drivers/message/fusion/mptctl.h conflict!
236'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 237'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 238'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 239'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 240'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 241'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
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242'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
243'o' 40-41 mtd/ubi-user.h UBI
244'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 245'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 246'p' 00-1F linux/rtc.h conflict!
cef2cf07 247'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 248'p' 40-7F linux/nvram.h
cb5a8b2c 249'p' 80-9F linux/ppdev.h user-space parport
1da177e4 250 <mailto:tim@cyberelk.net>
717c0336 251'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 252 <mailto:giometti@linux.it>
1da177e4 253'q' 00-1F linux/serio.h
cb5a8b2c 254'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 255 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 256'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
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257's' all linux/cdk.h
258't' 00-7F linux/if_ppp.h
259't' 80-8F linux/isdn_ppp.h
cb5a8b2c 260't' 90 linux/toshiba.h
2116b7a4 261'u' 00-1F linux/smb_fs.h gone
5f708812 262'u' 20-3F linux/uvcvideo.h USB video class host driver
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263'v' 00-1F linux/ext2_fs.h conflict!
264'v' 00-1F linux/fs.h conflict!
265'v' 00-0F linux/sonypi.h conflict!
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266'v' C0-DF media/pwc-ioctl.h conflict!
267'v' C0-FF linux/meye.h conflict!
cb5a8b2c 268'v' D0-DF drivers/media/video/cpia2/cpia2dev.h conflict!
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269'w' all CERN SCI driver
270'y' 00-1F packet based user level communications
271 <mailto:zapman@interlan.net>
cb5a8b2c 272'z' 00-3F CAN bus card conflict!
1da177e4 273 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 274'z' 40-7F CAN bus card conflict!
1da177e4 275 <mailto:oe@port.de>
cb5a8b2c 276'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 277'|' 00-7F linux/media.h
1da177e4 2780x80 00-1F linux/fb.h
07983f0e 2790x89 00-06 arch/x86/include/asm/sockios.h
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2800x89 0B-DF linux/sockios.h
2810x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2820x89 E0-EF linux/dn.h PROTOPRIVATE range
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2830x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2840x8B all linux/wireless.h
2850x8C 00-3F WiNRADiO driver
0ea6e611 286 <http://www.winradio.com.au/>
1da177e4 2870x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2880x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2890x93 60-7F linux/auto_fs.h
cb5a8b2c 2900x94 all fs/btrfs/ioctl.h
fc7f99cf 2910x97 00-7F fs/ceph/ioctl.h Ceph file system
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2920x99 00-0F 537-Addinboard driver
293 <mailto:buk@buks.ipn.de>
2940xA0 all linux/sdp/sdp.h Industrial Device Project
295 <mailto:kenji@bitgate.com>
ea41b1e5 2960xA2 00-0F arch/tile/include/asm/hardwall.h
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2970xA3 80-8F Port ACL in development:
298 <mailto:tlewis@mindspring.com>
2990xA3 90-9F linux/dtlk.h
3000xAB 00-1F linux/nbd.h
3010xAC 00-1F linux/raw.h
3020xAD 00 Netfilter device in development:
cb5a8b2c 303 <mailto:rusty@rustcorp.com.au>
258ac8e0 3040xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 305 <mailto:kvm@vger.kernel.org>
6db71994 3060xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
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3070xB0 all RATIO devices in development:
308 <mailto:vgo@ratio.de>
3090xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3100xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3110xC0 00-0F linux/usb/iowarrior.h
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3120xCB 00-1F CBM serial IEC bus in development:
313 <mailto:michael.klein@puffin.lb.shuttle.de>
cb5a8b2c
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3140xCD 01 linux/reiserfs_fs.h
3150xCF 02 fs/cifs/ioctl.c
3160xDB 00-0F drivers/char/mwave/mwavepub.h
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3170xDD 00-3F ZFCP device driver see drivers/s390/scsi/
318 <mailto:aherrman@de.ibm.com>
cb5a8b2c 3190xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 320 <mailto:thomas@winischhofer.net>
1ce4d390
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3210xF4 00-1F video/mbxfb.h mbxfb
322 <mailto:raph@8d.com>
14d01ff5
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3230xF6 all LTTng Linux Trace Toolkit Next Generation
324 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3250xFD all linux/dm-ioctl.h