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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [Documentation/] [ioctl-number.txt] - Rev 1765
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Ioctl Numbers19 October 1999Michael Elizabeth Chastain<mec@shout.net>If you are adding new ioctl's to the kernel, you should use the _IOmacros defined in <linux/ioctl.h>:_IO an ioctl with no parameters_IOW an ioctl with write parameters (copy_from_user)_IOR an ioctl with read parameters (copy_to_user)_IOWR an ioctl with both write and read parameters.'Write' and 'read' are from the user's point of view, just like thesystem calls 'write' and 'read'. For example, a SET_FOO ioctl wouldbe _IOW, although the kernel would actually read data from user space;a GET_FOO ioctl would be _IOR, although the kernel would actually writedata to user space.The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letteror number from the table below. Because of the large number of drivers,many drivers share a partial letter with other drivers.If you are writing a driver for a new device and need a letter, pick anunused block with enough room for expansion: 32 to 256 ioctl commands.You can register the block by patching this file and submitting thepatch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> andI'll register one for you.The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence numberto distinguish ioctls from each other. The third argument to _IOW,_IOR, or _IOWR is the type of the data going into the kernel or comingout of the kernel (e.g. 'int' or 'struct foo').Some devices use their major number as the identifier; this is OK, aslong as it is unique. Some devices are irregular and don't follow anyconvention at all.Following this convention is good because:(1) Keeping the ioctl's globally unique helps error checking:if a program calls an ioctl on the wrong device, it will get anerror rather than some unexpected behaviour.(2) The 'strace' build procedure automatically finds ioctl numbersdefined with _IO, _IOW, _IOR, or _IOWR.(3) 'strace' can decode numbers back into useful names when thenumbers are unique.(4) People looking for ioctls can grep for them more easily whenthis convention is used to define the ioctl numbers.(5) When following the convention, the driver code can use genericcode to copy the parameters between user and kernel space.This table lists ioctls visible from user land for Linux/i386. It containsmost drivers up to 2.3.14, but I know I am missing some.Code Seq# Include File Comments========================================================0x00 00-1F linux/fs.h conflict!0x00 00-1F scsi/scsi_ioctl.h conflict!0x00 00-1F linux/fb.h conflict!0x00 00-1F linux/wavefront.h conflict!0x02 all linux/fd.h0x03 all linux/hdreg.h0x04 all linux/umsdos_fs.h0x06 all linux/lp.h0x09 all linux/md.h0x12 all linux/fs.hlinux/blkpg.h0x20 all drivers/cdrom/cm206.h0x22 all scsi/sg.h'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl<ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>'6' 00-10 <asm-i386/processor.h> Intel IA32 microcode update driver<mailto:tigran@veritas.com>'8' all SNP8023 advanced NIC card<mailto:mcr@solidum.com>'A' 00-1F linux/apm_bios.h'B' C0-FF advanced bbus<mailto:maassen@uni-freiburg.de>'C' all linux/soundcard.h'D' all asm-s390/dasd.h'F' all linux/fb.h'I' all linux/isdn.h'J' 00-1F drivers/scsi/gdth_ioctl.h'K' all linux/kd.h'L' 00-1F linux/loop.h'L' E0-FF linux/ppdd.h encrypted disk device driver<http://linux01.gwdg.de/~alatham/ppdd.html>'M' all linux/soundcard.h conflict!'M' 00-1F linux/isicom.h conflict!'N' 00-1F drivers/usb/scanner.h'P' all linux/soundcard.h'Q' all linux/soundcard.h'R' 00-1F linux/random.h'S' all linux/cdrom.h conflict!'S' 80-81 scsi/scsi_ioctl.h conflict!'S' 82-FF scsi/scsi.h conflict!'T' all linux/soundcard.h conflict!'T' all asm-i386/ioctls.h conflict!'U' all linux/drivers/usb/usb.h'V' all linux/vt.h'W' 00-1F linux/watchdog.h conflict!'W' 00-1F linux/wanrouter.h conflict!'X' all linux/xfs_fs.h'Y' all linux/cyclades.h'a' all ATM on linux<http://lrcwww.epfl.ch/linux-atm/magic.html>'b' 00-FF bit3 vme host bridge<mailto:natalia@nikhefk.nikhef.nl>'c' 00-7F linux/comstats.h conflict!'c' 00-7F linux/coda.h conflict!'d' 00-1F linux/devfs_fs.h conflict!'d' 00-DF linux/video_decoder.h conflict!'d' F0-FF linux/digi1.h'e' all linux/digi1.h conflict!'e' 00-1F linux/video_encoder.h conflict!'e' 00-1F net/irda/irtty.h conflict!'f' 00-1F linux/ext2_fs.h'h' 00-7F Charon filesystem<mailto:zapman@interlan.net>'i' 00-3F linux/i2o.h'j' 00-3F linux/joystick.h'k' all asm-sparc/kbio.hasm-sparc64/kbio.h'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system<http://mikonos.dia.unisa.it/tcfs>'l' 40-7F linux/udf_fs_i.h in development:<http://www.trylinux.com/projects/udf/>'m' all linux/mtio.h conflict!'m' all linux/soundcard.h conflict!'m' all linux/synclink.h conflict!'m' 00-1F net/irda/irmod.h conflict!'n' 00-7F linux/ncp_fs.h'n' E0-FF video/matrox.h matroxfb'p' 00-3F linux/mc146818rtc.h'p' 40-7F linux/nvram.h'p' 80-9F user-space parport<mailto:tim@cyberelk.net>'q' 00-1F linux/videotext.h conflict!'q' 80-FF Internet PhoneJACK, Internet LineJACK<http://www.quicknet.net>'r' 00-1F linux/msdos_fs.h's' all linux/cdk.h't' 00-7F linux/if_ppp.h't' 80-8F linux/isdn_ppp.h'u' 00-1F linux/smb_fs.h'v' 00-1F linux/ext2_fs.h conflict!'v' all linux/videodev.h conflict!'w' all CERN SCI driver'y' 00-1F packet based user level communications<mailto:zapman@interlan.net>'z' 00-3F CAN bus card<mailto:hdstich@connectu.ulm.circular.de>'z' 40-7F CAN bus card<mailto:oe@port.de>0x80 00-1F linux/fb.h0x89 00-06 asm-i386/sockios.h0x89 0B-DF linux/sockios.h0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range0x8B all linux/wireless.h0x8C 00-3F WiNRADiO driver<http://www.proximity.com.au/~brian/winradio/>0x90 00 drivers/cdrom/sbpcd.h0x93 60-7F linux/auto_fs.h0x99 00-0F 537-Addinboard driver<mailto:buk@buks.ipn.de>0xA0 all linux/sdp/sdp.h Industrial Device Project<mailto:kenji@bitgate.com>0xA3 80-8F Port ACL in development:<mailto:tlewis@mindspring.com>0xA3 90-9F linux/dtlk.h0xAB 00-1F linux/nbd.h0xAC 00-1F linux/raw.h0xAD 00 Netfilter device in development:<mailto:rusty@rustcorp.com.au>0xB0 all RATIO devices in development:<mailto:vgo@ratio.de>0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>0xCB 00-1F CBM serial IEC bus in development:<mailto:michael.klein@puffin.lb.shuttle.de>0xFE 00-9F Logical Volume Manager <mailto:linux-lvm@sistina.com>