mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
199 lines
7.1 KiB
Plaintext
199 lines
7.1 KiB
Plaintext
Ioctl Numbers
|
|
19 October 1999
|
|
Michael Elizabeth Chastain
|
|
<mec@shout.net>
|
|
|
|
If you are adding new ioctl's to the kernel, you should use the _IO
|
|
macros 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 the
|
|
system calls 'write' and 'read'. For example, a SET_FOO ioctl would
|
|
be _IOW, although the kernel would actually read data from user space;
|
|
a GET_FOO ioctl would be _IOR, although the kernel would actually write
|
|
data to user space.
|
|
|
|
The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
|
|
or 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 an
|
|
unused block with enough room for expansion: 32 to 256 ioctl commands.
|
|
You can register the block by patching this file and submitting the
|
|
patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
|
|
I'll register one for you.
|
|
|
|
The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
|
|
to distinguish ioctls from each other. The third argument to _IOW,
|
|
_IOR, or _IOWR is the type of the data going into the kernel or coming
|
|
out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
|
|
sizeof(arg) as the third argument as this results in your ioctl thinking
|
|
it passes an argument of type size_t.
|
|
|
|
Some devices use their major number as the identifier; this is OK, as
|
|
long as it is unique. Some devices are irregular and don't follow any
|
|
convention 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 an
|
|
error rather than some unexpected behaviour.
|
|
|
|
(2) The 'strace' build procedure automatically finds ioctl numbers
|
|
defined with _IO, _IOW, _IOR, or _IOWR.
|
|
|
|
(3) 'strace' can decode numbers back into useful names when the
|
|
numbers are unique.
|
|
|
|
(4) People looking for ioctls can grep for them more easily when
|
|
this convention is used to define the ioctl numbers.
|
|
|
|
(5) When following the convention, the driver code can use generic
|
|
code to copy the parameters between user and kernel space.
|
|
|
|
This table lists ioctls visible from user land for Linux/i386. It contains
|
|
most 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.h
|
|
0x03 all linux/hdreg.h
|
|
0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
|
|
0x06 all linux/lp.h
|
|
0x09 all linux/md.h
|
|
0x12 all linux/fs.h
|
|
linux/blkpg.h
|
|
0x1b all InfiniBand Subsystem <http://www.openib.org/>
|
|
0x20 all drivers/cdrom/cm206.h
|
|
0x22 all scsi/sg.h
|
|
'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
|
|
'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
|
|
<ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
|
|
'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
|
|
'E' all linux/input.h
|
|
'F' all linux/fb.h
|
|
'H' all linux/hiddev.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
|
|
'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' 00-EF linux/drivers/usb/usb.h
|
|
'U' F0-FF drivers/usb/auerswald.c
|
|
'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-FF linux/char/drm/drm/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
|
|
'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://sourceforge.net/projects/linux-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
|
|
'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
|
|
'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
|
|
'p' 00-3F linux/mc146818rtc.h conflict!
|
|
'p' 40-7F linux/nvram.h
|
|
'p' 80-9F user-space parport
|
|
<mailto:tim@cyberelk.net>
|
|
'q' 00-1F linux/serio.h
|
|
'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.h
|
|
0x81 00-1F linux/videotext.h
|
|
0x89 00-06 asm-i386/sockios.h
|
|
0x89 0B-DF linux/sockios.h
|
|
0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
|
|
0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
|
|
0x8B all linux/wireless.h
|
|
0x8C 00-3F WiNRADiO driver
|
|
<http://www.proximity.com.au/~brian/winradio/>
|
|
0x90 00 drivers/cdrom/sbpcd.h
|
|
0x93 60-7F linux/auto_fs.h
|
|
0x99 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.h
|
|
0xAB 00-1F linux/nbd.h
|
|
0xAC 00-1F linux/raw.h
|
|
0xAD 00 Netfilter device in development:
|
|
<mailto:rusty@rustcorp.com.au>
|
|
0xAE all linux/kvm.h Kernel-based Virtual Machine
|
|
<mailto:kvm-devel@lists.sourceforge.net>
|
|
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>
|
|
0xDD 00-3F ZFCP device driver see drivers/s390/scsi/
|
|
<mailto:aherrman@de.ibm.com>
|
|
0xF3 00-3F video/sisfb.h sisfb (in development)
|
|
<mailto:thomas@winischhofer.net>
|
|
0xF4 00-1F video/mbxfb.h mbxfb
|
|
<mailto:raph@8d.com>
|