userfaultfd: uAPI
[deliverable/linux.git] / Documentation / ioctl / ioctl-number.txt
CommitLineData
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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
d475f942 750x10 10-1F arch/s390/include/uapi/sclp_ctl.h
07be0382 760x10 20-2F arch/s390/include/uapi/asm/hypfs.h
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770x12 all linux/fs.h
78 linux/blkpg.h
0ea6e611 790x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
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800x20 all drivers/cdrom/cm206.h
810x22 all scsi/sg.h
82'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 83'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 84'&' 00-07 drivers/firewire/nosy-user.h
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85'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
86 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
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87'2' 01-04 linux/i2o.h
88'3' 00-0F drivers/s390/char/raw3270.h conflict!
89'3' 00-1F linux/suspend_ioctls.h conflict!
90 and kernel/power/user.c
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91'8' all SNP8023 advanced NIC card
92 <mailto:mcr@solidum.com>
cba3345c 93';' 64-7F linux/vfio.h
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94'@' 00-0F linux/radeonfb.h conflict!
95'@' 00-0F drivers/video/aty/aty128fb.c conflict!
96'A' 00-1F linux/apm_bios.h conflict!
97'A' 00-0F linux/agpgart.h conflict!
98 and drivers/char/agp/compat_ioctl.h
99'A' 00-7F sound/asound.h conflict!
100'B' 00-1F linux/cciss_ioctl.h conflict!
101'B' 00-0F include/linux/pmu.h conflict!
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102'B' C0-FF advanced bbus
103 <mailto:maassen@uni-freiburg.de>
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104'C' all linux/soundcard.h conflict!
105'C' 01-2F linux/capi.h conflict!
106'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 107'D' all arch/s390/include/asm/dasd.h
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108'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
109'D' 05 drivers/scsi/pmcraid.h
110'E' all linux/input.h conflict!
111'E' 00-0F xen/evtchn.h conflict!
112'F' all linux/fb.h conflict!
113'F' 01-02 drivers/scsi/pmcraid.h conflict!
114'F' 20 drivers/video/fsl-diu-fb.h conflict!
115'F' 20 drivers/video/intelfb/intelfb.h conflict!
116'F' 20 linux/ivtvfb.h conflict!
117'F' 20 linux/matroxfb.h conflict!
118'F' 20 drivers/video/aty/atyfb_base.c conflict!
119'F' 00-0F video/da8xx-fb.h conflict!
120'F' 80-8F linux/arcfb.h conflict!
121'F' DD video/sstfb.h conflict!
122'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
123'G' 00-0F linux/gigaset_dev.h conflict!
124'H' 00-7F linux/hiddev.h conflict!
125'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 126'H' 01 linux/mei.h conflict!
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127'H' 02 linux/mei.h conflict!
128'H' 03 linux/mei.h conflict!
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129'H' 00-0F sound/asound.h conflict!
130'H' 20-40 sound/asound_fm.h conflict!
131'H' 80-8F sound/sfnt_info.h conflict!
132'H' 10-8F sound/emu10k1.h conflict!
133'H' 10-1F sound/sb16_csp.h conflict!
134'H' 10-1F sound/hda_hwdep.h conflict!
135'H' 40-4F sound/hdspm.h conflict!
136'H' 40-4F sound/hdsp.h conflict!
137'H' 90 sound/usb/usx2y/usb_stream.h
3edce1cf 138'H' A0 uapi/linux/usb/cdc-wdm.h
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139'H' C0-F0 net/bluetooth/hci.h conflict!
140'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
141'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
142'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 143'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
82fbb4f7 144'H' F8-FA sound/firewire.h
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145'I' all linux/isdn.h conflict!
146'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
147'I' 40-4F linux/mISDNif.h conflict!
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148'J' 00-1F drivers/scsi/gdth_ioctl.h
149'K' all linux/kd.h
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150'L' 00-1F linux/loop.h conflict!
151'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
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152'L' E0-FF linux/ppdd.h encrypted disk device driver
153 <http://linux01.gwdg.de/~alatham/ppdd.html>
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154'M' all linux/soundcard.h conflict!
155'M' 01-16 mtd/mtd-abi.h conflict!
156 and drivers/mtd/mtdchar.c
157'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
158'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 159'N' 00-1F drivers/usb/scanner.h
b60503ba 160'N' 40-7F drivers/block/nvme.c
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161'O' 00-06 mtd/ubi-user.h UBI
162'P' all linux/soundcard.h conflict!
163'P' 60-6F sound/sscape_ioctl.h conflict!
164'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 165'Q' all linux/soundcard.h
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166'R' 00-1F linux/random.h conflict!
167'R' 01 linux/rfkill.h conflict!
cb5a8b2c 168'R' C0-DF net/bluetooth/rfcomm.h
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169'S' all linux/cdrom.h conflict!
170'S' 80-81 scsi/scsi_ioctl.h conflict!
171'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 172'S' 00-7F sound/asequencer.h conflict!
1da177e4 173'T' all linux/soundcard.h conflict!
cb5a8b2c 174'T' 00-AF sound/asound.h conflict!
07983f0e 175'T' all arch/x86/include/asm/ioctls.h conflict!
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176'T' C0-DF linux/if_tun.h conflict!
177'U' all sound/asound.h conflict!
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178'U' 00-CF linux/uinput.h conflict!
179'U' 00-EF linux/usbdevice_fs.h
180'U' C0-CF drivers/bluetooth/hci_uart.h
181'V' all linux/vt.h conflict!
182'V' all linux/videodev2.h conflict!
183'V' C0 linux/ivtvfb.h conflict!
184'V' C0 linux/ivtv.h conflict!
185'V' C0 media/davinci/vpfe_capture.h conflict!
186'V' C0 media/si4713.h conflict!
1da177e4 187'W' 00-1F linux/watchdog.h conflict!
a786a7c0 188'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
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189'W' 00-3F sound/asound.h conflict!
190'X' all fs/xfs/xfs_fs.h conflict!
191 and fs/xfs/linux-2.6/xfs_ioctl32.h
192 and include/linux/falloc.h
193 and linux/fs.h
194'X' all fs/ocfs2/ocfs_fs.h conflict!
195'X' 01 linux/pktcdvd.h conflict!
1da177e4 196'Y' all linux/cyclades.h
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197'Z' 14-15 drivers/message/fusion/mptctl.h
198'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
bc5bca53 199 <mailto:gregkh@linuxfoundation.org>
cb5a8b2c 200'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 201 <http://lrcwww.epfl.ch/>
cea4001a 202'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
cb5a8b2c 203'b' 00-FF conflict! bit3 vme host bridge
1da177e4 204 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 205'c' all linux/cm4000_cs.h conflict!
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206'c' 00-7F linux/comstats.h conflict!
207'c' 00-7F linux/coda.h conflict!
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208'c' 00-1F linux/chio.h conflict!
209'c' 80-9F arch/s390/include/asm/chsc.h conflict!
210'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 211'd' 00-FF linux/char/drm/drm/h conflict!
cb5a8b2c 212'd' 02-40 pcmcia/ds.h conflict!
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213'd' F0-FF linux/digi1.h
214'e' all linux/digi1.h conflict!
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215'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
216'f' 00-1F linux/ext2_fs.h conflict!
217'f' 00-1F linux/ext3_fs.h conflict!
218'f' 00-0F fs/jfs/jfs_dinode.h conflict!
219'f' 00-0F fs/ext4/ext4.h conflict!
220'f' 00-0F linux/fs.h conflict!
221'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
222'g' 00-0F linux/usb/gadgetfs.h
223'g' 20-2F linux/usb/g_printer.h
224'h' 00-7F conflict! Charon filesystem
1da177e4 225 <mailto:zapman@interlan.net>
cb5a8b2c 226'h' 00-1F linux/hpet.h conflict!
a051f71c 227'h' 80-8F fs/hfsplus/ioctl.c
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228'i' 00-3F linux/i2o-dev.h conflict!
229'i' 0B-1F linux/ipmi.h conflict!
230'i' 80-8F linux/i8k.h
1da177e4 231'j' 00-3F linux/joystick.h
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232'k' 00-0F linux/spi/spidev.h conflict!
233'k' 00-05 video/kyro.h conflict!
43139a61 234'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 235'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 236 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 237'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 238 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 239'm' 00-09 linux/mmtimer.h conflict!
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240'm' all linux/mtio.h conflict!
241'm' all linux/soundcard.h conflict!
242'm' all linux/synclink.h conflict!
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243'm' 00-19 drivers/message/fusion/mptctl.h conflict!
244'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 245'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 246'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 247'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 248'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 249'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
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250'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
251'o' 40-41 mtd/ubi-user.h UBI
252'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 253'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 254'p' 00-1F linux/rtc.h conflict!
cef2cf07 255'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 256'p' 40-7F linux/nvram.h
cb5a8b2c 257'p' 80-9F linux/ppdev.h user-space parport
1da177e4 258 <mailto:tim@cyberelk.net>
717c0336 259'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 260 <mailto:giometti@linux.it>
1da177e4 261'q' 00-1F linux/serio.h
cb5a8b2c 262'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 263 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 264'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 265's' all linux/cdk.h
bf7daebb 266't' 00-7F linux/ppp-ioctl.h
1da177e4 267't' 80-8F linux/isdn_ppp.h
cb5a8b2c 268't' 90 linux/toshiba.h
2116b7a4 269'u' 00-1F linux/smb_fs.h gone
5f708812 270'u' 20-3F linux/uvcvideo.h USB video class host driver
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271'v' 00-1F linux/ext2_fs.h conflict!
272'v' 00-1F linux/fs.h conflict!
273'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c 274'v' C0-FF linux/meye.h conflict!
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275'w' all CERN SCI driver
276'y' 00-1F packet based user level communications
277 <mailto:zapman@interlan.net>
cb5a8b2c 278'z' 00-3F CAN bus card conflict!
1da177e4 279 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 280'z' 40-7F CAN bus card conflict!
1da177e4 281 <mailto:oe@port.de>
cb5a8b2c 282'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 283'|' 00-7F linux/media.h
1da177e4 2840x80 00-1F linux/fb.h
07983f0e 2850x89 00-06 arch/x86/include/asm/sockios.h
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2860x89 0B-DF linux/sockios.h
2870x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2880x89 E0-EF linux/dn.h PROTOPRIVATE range
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2890x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2900x8B all linux/wireless.h
2910x8C 00-3F WiNRADiO driver
0ea6e611 292 <http://www.winradio.com.au/>
1da177e4 2930x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2940x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2950x93 60-7F linux/auto_fs.h
cb5a8b2c 2960x94 all fs/btrfs/ioctl.h
fc7f99cf 2970x97 00-7F fs/ceph/ioctl.h Ceph file system
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2980x99 00-0F 537-Addinboard driver
299 <mailto:buk@buks.ipn.de>
3000xA0 all linux/sdp/sdp.h Industrial Device Project
301 <mailto:kenji@bitgate.com>
ea41b1e5 3020xA2 00-0F arch/tile/include/asm/hardwall.h
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3030xA3 80-8F Port ACL in development:
304 <mailto:tlewis@mindspring.com>
3050xA3 90-9F linux/dtlk.h
1038628d 3060xAA 00-3F linux/uapi/linux/userfaultfd.h
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3070xAB 00-1F linux/nbd.h
3080xAC 00-1F linux/raw.h
3090xAD 00 Netfilter device in development:
cb5a8b2c 310 <mailto:rusty@rustcorp.com.au>
258ac8e0 3110xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 312 <mailto:kvm@vger.kernel.org>
6db71994 3130xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
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3140xB0 all RATIO devices in development:
315 <mailto:vgo@ratio.de>
3160xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3170xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3180xC0 00-0F linux/usb/iowarrior.h
a9282d01 3190xCA 00-0F uapi/misc/cxl.h
65be2c79 3200xCA 80-8F uapi/scsi/cxlflash_ioctl.h
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3210xCB 00-1F CBM serial IEC bus in development:
322 <mailto:michael.klein@puffin.lb.shuttle.de>
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3230xCD 01 linux/reiserfs_fs.h
3240xCF 02 fs/cifs/ioctl.c
3250xDB 00-0F drivers/char/mwave/mwavepub.h
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3260xDD 00-3F ZFCP device driver see drivers/s390/scsi/
327 <mailto:aherrman@de.ibm.com>
00c570f4 3280xE5 00-3F linux/fuse.h
e7c256fb 3290xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
cb5a8b2c 3300xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 331 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3320xF4 00-1F video/mbxfb.h mbxfb
333 <mailto:raph@8d.com>
14d01ff5
MD
3340xF6 all LTTng Linux Trace Toolkit Next Generation
335 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3360xFD all linux/dm-ioctl.h
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