| blob | 91261a32a57397bfcb5519cb4afc16c22900683c |
1 Ioctl Numbers
2 19 October 1999
3 Michael Elizabeth Chastain
4 <mec@shout.net>
6 If you are adding new ioctl's to the kernel, you should use the _IO
7 macros defined in <linux/ioctl.h>:
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.
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.
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.
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.
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.
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.
41 Following this convention is good because:
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.
47 (2) The 'strace' build procedure automatically finds ioctl numbers
48 defined with _IO, _IOW, _IOR, or _IOWR.
50 (3) 'strace' can decode numbers back into useful names when the
51 numbers are unique.
53 (4) People looking for ioctls can grep for them more easily when
54 this convention is used to define the ioctl numbers.
56 (5) When following the convention, the driver code can use generic
57 code to copy the parameters between user and kernel space.
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/.
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 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h
76 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h
77 0x12 all linux/fs.h
78 linux/blkpg.h
79 0x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
80 0x20 all drivers/cdrom/cm206.h
81 0x22 all scsi/sg.h
82 '#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
83 '$' 00-0F linux/perf_counter.h, linux/perf_event.h
84 '%' 00-0F include/uapi/linux/stm.h
85 System Trace Module subsystem
86 <mailto:alexander.shishkin@linux.intel.com>
87 '&' 00-07 drivers/firewire/nosy-user.h
88 '1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
89 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
90 '2' 01-04 linux/i2o.h
91 '3' 00-0F drivers/s390/char/raw3270.h conflict!
92 '3' 00-1F linux/suspend_ioctls.h conflict!
93 and kernel/power/user.c
94 '8' all SNP8023 advanced NIC card
95 <mailto:mcr@solidum.com>
96 ';' 64-7F linux/vfio.h
97 '@' 00-0F linux/radeonfb.h conflict!
98 '@' 00-0F drivers/video/aty/aty128fb.c conflict!
99 'A' 00-1F linux/apm_bios.h conflict!
100 'A' 00-0F linux/agpgart.h conflict!
101 and drivers/char/agp/compat_ioctl.h
102 'A' 00-7F sound/asound.h conflict!
103 'B' 00-1F linux/cciss_ioctl.h conflict!
104 'B' 00-0F include/linux/pmu.h conflict!
105 'B' C0-FF advanced bbus
106 <mailto:maassen@uni-freiburg.de>
107 'C' all linux/soundcard.h conflict!
108 'C' 01-2F linux/capi.h conflict!
109 'C' F0-FF drivers/net/wan/cosa.h conflict!
110 'D' all arch/s390/include/asm/dasd.h
111 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
112 'D' 05 drivers/scsi/pmcraid.h
113 'E' all linux/input.h conflict!
114 'E' 00-0F xen/evtchn.h conflict!
115 'F' all linux/fb.h conflict!
116 'F' 01-02 drivers/scsi/pmcraid.h conflict!
117 'F' 20 drivers/video/fsl-diu-fb.h conflict!
118 'F' 20 drivers/video/intelfb/intelfb.h conflict!
119 'F' 20 linux/ivtvfb.h conflict!
120 'F' 20 linux/matroxfb.h conflict!
121 'F' 20 drivers/video/aty/atyfb_base.c conflict!
122 'F' 00-0F video/da8xx-fb.h conflict!
123 'F' 80-8F linux/arcfb.h conflict!
124 'F' DD video/sstfb.h conflict!
125 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
126 'G' 00-0F linux/gigaset_dev.h conflict!
127 'H' 00-7F linux/hiddev.h conflict!
128 'H' 00-0F linux/hidraw.h conflict!
129 'H' 01 linux/mei.h conflict!
130 'H' 02 linux/mei.h conflict!
131 'H' 03 linux/mei.h conflict!
132 'H' 00-0F sound/asound.h conflict!
133 'H' 20-40 sound/asound_fm.h conflict!
134 'H' 80-8F sound/sfnt_info.h conflict!
135 'H' 10-8F sound/emu10k1.h conflict!
136 'H' 10-1F sound/sb16_csp.h conflict!
137 'H' 10-1F sound/hda_hwdep.h conflict!
138 'H' 40-4F sound/hdspm.h conflict!
139 'H' 40-4F sound/hdsp.h conflict!
140 'H' 90 sound/usb/usx2y/usb_stream.h
141 'H' A0 uapi/linux/usb/cdc-wdm.h
142 'H' C0-F0 net/bluetooth/hci.h conflict!
143 'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
144 'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
145 'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
146 'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
147 'H' F8-FA sound/firewire.h
148 'I' all linux/isdn.h conflict!
149 'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
150 'I' 40-4F linux/mISDNif.h conflict!
151 'J' 00-1F drivers/scsi/gdth_ioctl.h
152 'K' all linux/kd.h
153 'L' 00-1F linux/loop.h conflict!
154 'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
155 'L' 20-2F linux/lightnvm.h
156 'L' E0-FF linux/ppdd.h encrypted disk device driver
157 <http://linux01.gwdg.de/~alatham/ppdd.html>
158 'M' all linux/soundcard.h conflict!
159 'M' 01-16 mtd/mtd-abi.h conflict!
160 and drivers/mtd/mtdchar.c
161 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
162 'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
163 'N' 00-1F drivers/usb/scanner.h
164 'N' 40-7F drivers/block/nvme.c
165 'O' 00-06 mtd/ubi-user.h UBI
166 'P' all linux/soundcard.h conflict!
167 'P' 60-6F sound/sscape_ioctl.h conflict!
168 'P' 00-0F drivers/usb/class/usblp.c conflict!
169 'Q' all linux/soundcard.h
170 'R' 00-1F linux/random.h conflict!
171 'R' 01 linux/rfkill.h conflict!
172 'R' C0-DF net/bluetooth/rfcomm.h
173 'S' all linux/cdrom.h conflict!
174 'S' 80-81 scsi/scsi_ioctl.h conflict!
175 'S' 82-FF scsi/scsi.h conflict!
176 'S' 00-7F sound/asequencer.h conflict!
177 'T' all linux/soundcard.h conflict!
178 'T' 00-AF sound/asound.h conflict!
179 'T' all arch/x86/include/asm/ioctls.h conflict!
180 'T' C0-DF linux/if_tun.h conflict!
181 'U' all sound/asound.h conflict!
182 'U' 00-CF linux/uinput.h conflict!
183 'U' 00-EF linux/usbdevice_fs.h
184 'U' C0-CF drivers/bluetooth/hci_uart.h
185 'V' all linux/vt.h conflict!
186 'V' all linux/videodev2.h conflict!
187 'V' C0 linux/ivtvfb.h conflict!
188 'V' C0 linux/ivtv.h conflict!
189 'V' C0 media/davinci/vpfe_capture.h conflict!
190 'V' C0 media/si4713.h conflict!
191 'W' 00-1F linux/watchdog.h conflict!
192 'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
193 'W' 00-3F sound/asound.h conflict!
194 'X' all fs/xfs/xfs_fs.h conflict!
195 and fs/xfs/linux-2.6/xfs_ioctl32.h
196 and include/linux/falloc.h
197 and linux/fs.h
198 'X' all fs/ocfs2/ocfs_fs.h conflict!
199 'X' 01 linux/pktcdvd.h conflict!
200 'Y' all linux/cyclades.h
201 'Z' 14-15 drivers/message/fusion/mptctl.h
202 '[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
203 <mailto:gregkh@linuxfoundation.org>
204 'a' all linux/atm*.h, linux/sonet.h ATM on linux
205 <http://lrcwww.epfl.ch/>
206 'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
207 'b' 00-FF conflict! bit3 vme host bridge
208 <mailto:natalia@nikhefk.nikhef.nl>
209 'c' all linux/cm4000_cs.h conflict!
210 'c' 00-7F linux/comstats.h conflict!
211 'c' 00-7F linux/coda.h conflict!
212 'c' 00-1F linux/chio.h conflict!
213 'c' 80-9F arch/s390/include/asm/chsc.h conflict!
214 'c' A0-AF arch/x86/include/asm/msr.h conflict!
215 'd' 00-FF linux/char/drm/drm/h conflict!
216 'd' 02-40 pcmcia/ds.h conflict!
217 'd' F0-FF linux/digi1.h
218 'e' all linux/digi1.h conflict!
219 'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
220 'f' 00-1F linux/ext2_fs.h conflict!
221 'f' 00-1F linux/ext3_fs.h conflict!
222 'f' 00-0F fs/jfs/jfs_dinode.h conflict!
223 'f' 00-0F fs/ext4/ext4.h conflict!
224 'f' 00-0F linux/fs.h conflict!
225 'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
226 'g' 00-0F linux/usb/gadgetfs.h
227 'g' 20-2F linux/usb/g_printer.h
228 'h' 00-7F conflict! Charon filesystem
229 <mailto:zapman@interlan.net>
230 'h' 00-1F linux/hpet.h conflict!
231 'h' 80-8F fs/hfsplus/ioctl.c
232 'i' 00-3F linux/i2o-dev.h conflict!
233 'i' 0B-1F linux/ipmi.h conflict!
234 'i' 80-8F linux/i8k.h
235 'j' 00-3F linux/joystick.h
236 'k' 00-0F linux/spi/spidev.h conflict!
237 'k' 00-05 video/kyro.h conflict!
238 'k' 10-17 linux/hsi/hsi_char.h HSI character device
239 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
240 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
241 'l' 40-7F linux/udf_fs_i.h in development:
242 <http://sourceforge.net/projects/linux-udf/>
243 'm' 00-09 linux/mmtimer.h conflict!
244 'm' all linux/mtio.h conflict!
245 'm' all linux/soundcard.h conflict!
246 'm' all linux/synclink.h conflict!
247 'm' 00-19 drivers/message/fusion/mptctl.h conflict!
248 'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
249 'm' 00-1F net/irda/irmod.h conflict!
250 'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
251 'n' 80-8F linux/nilfs2_fs.h NILFS2
252 'n' E0-FF linux/matroxfb.h matroxfb
253 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
254 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
255 'o' 40-41 mtd/ubi-user.h UBI
256 'o' 01-A1 linux/dvb/*.h DVB
257 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
258 'p' 00-1F linux/rtc.h conflict!
259 'p' 00-3F linux/mc146818rtc.h conflict!
260 'p' 40-7F linux/nvram.h
261 'p' 80-9F linux/ppdev.h user-space parport
262 <mailto:tim@cyberelk.net>
263 'p' A1-A5 linux/pps.h LinuxPPS
264 <mailto:giometti@linux.it>
265 'q' 00-1F linux/serio.h
266 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
267 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
268 'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
269 's' all linux/cdk.h
270 't' 00-7F linux/ppp-ioctl.h
271 't' 80-8F linux/isdn_ppp.h
272 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM
273 'u' 00-1F linux/smb_fs.h gone
274 'u' 20-3F linux/uvcvideo.h USB video class host driver
275 'v' 00-1F linux/ext2_fs.h conflict!
276 'v' 00-1F linux/fs.h conflict!
277 'v' 00-0F linux/sonypi.h conflict!
278 'v' C0-FF linux/meye.h conflict!
279 'w' all CERN SCI driver
280 'y' 00-1F packet based user level communications
281 <mailto:zapman@interlan.net>
282 'z' 00-3F CAN bus card conflict!
283 <mailto:hdstich@connectu.ulm.circular.de>
284 'z' 40-7F CAN bus card conflict!
285 <mailto:oe@port.de>
286 'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
287 '|' 00-7F linux/media.h
288 0x80 00-1F linux/fb.h
289 0x89 00-06 arch/x86/include/asm/sockios.h
290 0x89 0B-DF linux/sockios.h
291 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
292 0x89 E0-EF linux/dn.h PROTOPRIVATE range
293 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
294 0x8B all linux/wireless.h
295 0x8C 00-3F WiNRADiO driver
296 <http://www.winradio.com.au/>
297 0x90 00 drivers/cdrom/sbpcd.h
298 0x92 00-0F drivers/usb/mon/mon_bin.c
299 0x93 60-7F linux/auto_fs.h
300 0x94 all fs/btrfs/ioctl.h
301 0x97 00-7F fs/ceph/ioctl.h Ceph file system
302 0x99 00-0F 537-Addinboard driver
303 <mailto:buk@buks.ipn.de>
304 0xA0 all linux/sdp/sdp.h Industrial Device Project
305 <mailto:kenji@bitgate.com>
306 0xA2 00-0F arch/tile/include/asm/hardwall.h
307 0xA3 80-8F Port ACL in development:
308 <mailto:tlewis@mindspring.com>
309 0xA3 90-9F linux/dtlk.h
310 0xAA 00-3F linux/uapi/linux/userfaultfd.h
311 0xAB 00-1F linux/nbd.h
312 0xAC 00-1F linux/raw.h
313 0xAD 00 Netfilter device in development:
314 <mailto:rusty@rustcorp.com.au>
315 0xAE all linux/kvm.h Kernel-based Virtual Machine
316 <mailto:kvm@vger.kernel.org>
317 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
318 0xB0 all RATIO devices in development:
319 <mailto:vgo@ratio.de>
320 0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
321 0xB3 00 linux/mmc/ioctl.h
322 0xC0 00-0F linux/usb/iowarrior.h
323 0xCA 00-0F uapi/misc/cxl.h
324 0xCA 80-8F uapi/scsi/cxlflash_ioctl.h
325 0xCB 00-1F CBM serial IEC bus in development:
326 <mailto:michael.klein@puffin.lb.shuttle.de>
327 0xCD 01 linux/reiserfs_fs.h
328 0xCF 02 fs/cifs/ioctl.c
329 0xDB 00-0F drivers/char/mwave/mwavepub.h
330 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/
331 <mailto:aherrman@de.ibm.com>
332 0xE5 00-3F linux/fuse.h
333 0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
334 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
335 <mailto:thomas@winischhofer.net>
336 0xF4 00-1F video/mbxfb.h mbxfb
337 <mailto:raph@8d.com>
338 0xF6 all LTTng Linux Trace Toolkit Next Generation
339 <mailto:mathieu.desnoyers@efficios.com>
340 0xFD all linux/dm-ioctl.h