Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/Documentation/ioctl-number.txt
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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'). 34 35 Some devices use their major number as the identifier; this is OK, as 36 long as it is unique. Some devices are irregular and don't follow any 37 convention at all. 38 39 Following this convention is good because: 40 41 (1) Keeping the ioctl's globally unique helps error checking: 42 if a program calls an ioctl on the wrong device, it will get an 43 error rather than some unexpected behaviour. 44 45 (2) The 'strace' build procedure automatically finds ioctl numbers 46 defined with _IO, _IOW, _IOR, or _IOWR. 47 48 (3) 'strace' can decode numbers back into useful names when the 49 numbers are unique. 50 51 (4) People looking for ioctls can grep for them more easily when 52 this convention is used to define the ioctl numbers. 53 54 (5) When following the convention, the driver code can use generic 55 code to copy the parameters between user and kernel space. 56 57 This table lists ioctls visible from user land for Linux/i386. It contains 58 most drivers up to 2.3.14, but I know I am missing some. 59 60 Code Seq# Include File Comments 61 ======================================================== 62 0x00 00-1F linux/fs.h conflict! 63 0x00 00-1F scsi/scsi_ioctl.h conflict! 64 0x00 00-1F linux/fb.h conflict! 65 0x00 00-1F linux/wavefront.h conflict! 66 0x02 all linux/fd.h 67 0x03 all linux/hdreg.h 68 0x04 all linux/umsdos_fs.h 69 0x06 all linux/lp.h 70 0x09 all linux/md.h 71 0x12 all linux/fs.h 72 linux/blkpg.h 73 0x20 all drivers/cdrom/cm206.h 74 0x22 all scsi/sg.h 75 '1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl 76 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> 77 '6' 00-10 <asm-i386/processor.h> Intel IA32 microcode update driver 78 <mailto:tigran@veritas.com> 79 '8' all SNP8023 advanced NIC card 80 <mailto:mcr@solidum.com> 81 'A' 00-1F linux/apm_bios.h 82 'B' C0-FF advanced bbus 83 <mailto:maassen@uni-freiburg.de> 84 'C' all linux/soundcard.h 85 'D' all asm-s390/dasd.h 86 'F' all linux/fb.h 87 'I' all linux/isdn.h 88 'J' 00-1F drivers/scsi/gdth_ioctl.h 89 'K' all linux/kd.h 90 'L' 00-1F linux/loop.h 91 'L' E0-FF linux/ppdd.h encrypted disk device driver 92 <http://linux01.gwdg.de/~alatham/ppdd.html> 93 'M' all linux/soundcard.h conflict! 94 'M' 00-1F linux/isicom.h conflict! 95 'N' 00-1F drivers/usb/scanner.h 96 'P' all linux/soundcard.h 97 'Q' all linux/soundcard.h 98 'R' 00-1F linux/random.h 99 'S' all linux/cdrom.h conflict! 100 'S' 80-81 scsi/scsi_ioctl.h conflict! 101 'S' 82-FF scsi/scsi.h conflict! 102 'T' all linux/soundcard.h conflict! 103 'T' all asm-i386/ioctls.h conflict! 104 'U' all linux/drivers/usb/usb.h 105 'V' all linux/vt.h 106 'W' 00-1F linux/watchdog.h conflict! 107 'W' 00-1F linux/wanrouter.h conflict! 108 'X' all linux/xfs_fs.h 109 'Y' all linux/cyclades.h 110 'a' all ATM on linux 111 <http://lrcwww.epfl.ch/linux-atm/magic.html> 112 'b' 00-FF bit3 vme host bridge 113 <mailto:natalia@nikhefk.nikhef.nl> 114 'c' 00-7F linux/comstats.h conflict! 115 'c' 00-7F linux/coda.h conflict! 116 'd' 00-1F linux/devfs_fs.h conflict! 117 'd' 00-DF linux/video_decoder.h conflict! 118 'd' F0-FF linux/digi1.h 119 'e' all linux/digi1.h conflict! 120 'e' 00-1F linux/video_encoder.h conflict! 121 'e' 00-1F net/irda/irtty.h conflict! 122 'f' 00-1F linux/ext2_fs.h 123 'h' 00-7F Charon filesystem 124 <mailto:zapman@interlan.net> 125 'i' 00-3F linux/i2o.h 126 'j' 00-3F linux/joystick.h 127 'k' all asm-sparc/kbio.h 128 asm-sparc64/kbio.h 129 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system 130 <http://mikonos.dia.unisa.it/tcfs> 131 'l' 40-7F linux/udf_fs_i.h in development: 132 <http://www.trylinux.com/projects/udf/> 133 'm' all linux/mtio.h conflict! 134 'm' all linux/soundcard.h conflict! 135 'm' all linux/synclink.h conflict! 136 'm' 00-1F net/irda/irmod.h conflict! 137 'n' 00-7F linux/ncp_fs.h 138 'n' E0-FF video/matrox.h matroxfb 139 'p' 00-3F linux/mc146818rtc.h 140 'p' 40-7F linux/nvram.h 141 'p' 80-9F user-space parport 142 <mailto:tim@cyberelk.net> 143 'q' 00-1F linux/videotext.h conflict! 144 'q' 80-FF Internet PhoneJACK, Internet LineJACK 145 <http://www.quicknet.net> 146 'r' 00-1F linux/msdos_fs.h 147 's' all linux/cdk.h 148 't' 00-7F linux/if_ppp.h 149 't' 80-8F linux/isdn_ppp.h 150 'u' 00-1F linux/smb_fs.h 151 'v' 00-1F linux/ext2_fs.h conflict! 152 'v' all linux/videodev.h conflict! 153 'w' all CERN SCI driver 154 'y' 00-1F packet based user level communications 155 <mailto:zapman@interlan.net> 156 'z' 00-3F CAN bus card 157 <mailto:hdstich@connectu.ulm.circular.de> 158 'z' 40-7F CAN bus card 159 <mailto:oe@port.de> 160 0x80 00-1F linux/fb.h 161 0x89 00-06 asm-i386/sockios.h 162 0x89 0B-DF linux/sockios.h 163 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range 164 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range 165 0x8B all linux/wireless.h 166 0x8C 00-3F WiNRADiO driver 167 <http://www.proximity.com.au/~brian/winradio/> 168 0x90 00 drivers/cdrom/sbpcd.h 169 0x93 60-7F linux/auto_fs.h 170 0x99 00-0F 537-Addinboard driver 171 <mailto:buk@buks.ipn.de> 172 0xA0 all linux/sdp/sdp.h Industrial Device Project 173 <mailto:kenji@bitgate.com> 174 0xA2 00-0F DVD decoder driver in development: 175 <http://linuxtv.org/dvd/api/> 176 0xA3 00-1F Philips SAA7146 dirver in development: 177 <mailto:Andreas.Beckmann@hamburg.sc.philips.com> 178 0xA3 80-8F Port ACL in development: 179 <mailto:tlewis@mindspring.com> 180 0xA3 90-9F linux/dtlk.h 181 0xAB 00-1F linux/nbd.h 182 0xAC 00-1F linux/raw.h 183 0xAD 00 Netfilter device in development: 184 <mailto:rusty@rustcorp.com.au> 185 0xB0 all RATIO devices in development: 186 <mailto:vgo@ratio.de> 187 0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca> 188 0xCB 00-1F CBM serial IEC bus in development: 189 <mailto:michael.klein@puffin.lb.shuttle.de> 190 191 0xFE 00-9F Logical Volume Manager <mailto:linux-lvm@sistina.com>
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