275 lines
6.3 KiB
Groff
275 lines
6.3 KiB
Groff
.\" $NetBSD: ioctl.9,v 1.12 2001/12/07 18:49:30 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Heiko W.Rupp <hwr@pilhuhn.de>
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of the The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.Dd December 7, 2001
|
|
.Dt IOCTL 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ioctl
|
|
.Nd "how to implement a new ioctl call to access device drivers"
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/ioctl.h>
|
|
.Fd #include <sys/ioccom.h>
|
|
.Ft int
|
|
.Fn ioctl "int" "unsigned long" "..."
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
are internally defined as
|
|
.Bl -tag -width define
|
|
.It #define FOOIOCTL fun(t,n,pt)
|
|
.El
|
|
.Pp
|
|
where the different variables and functions are:
|
|
.Bl -tag -width FOOIOCTL
|
|
.It Fn FOOIOCTL
|
|
the name which will later be given in the
|
|
.Xr ioctl 2
|
|
system call as second argument, e.g.
|
|
.Dl ioctl(s, FOOIOCTL, ...) .
|
|
.It Fn fun
|
|
a macro which can be one of
|
|
.Bl -tag -width _IOWR
|
|
.It _IO
|
|
the call is a simple message to the kernel by itself. It does not copy
|
|
anything into the kernel, nor does it want anything back.
|
|
.It _IOR
|
|
the call only reads parameters from the kernel and does not
|
|
pass any to it
|
|
.It _IOW
|
|
the call only writes parameters to the kernel, but does not want anything
|
|
back
|
|
.It _IOWR
|
|
the call writes data to the kernel and wants information back.
|
|
.El
|
|
.It Ar t
|
|
This integer describes to which subsystem the ioctl applies.
|
|
.Ar t
|
|
can be one of
|
|
.Bl -tag -width xxxxx -compact
|
|
.It '1'
|
|
pulse-per-second interface
|
|
.It '4'
|
|
.Xr i4b 4
|
|
.It 'a'
|
|
ISO networking
|
|
.It 'A'
|
|
ac devices (hp300)
|
|
.It 'A'
|
|
Advanced Power Management (hpcmips, i386, sparc), see
|
|
.Xr apm 4
|
|
.It 'A'
|
|
ADB devices (mac68k, macppc)
|
|
.It 'A'
|
|
.Xr audio 4
|
|
.It 'A'
|
|
.Xr i4btel 4
|
|
.It 'b'
|
|
.Xr \&tb 4
|
|
.It 'B'
|
|
bell device (x68k)
|
|
.It 'B'
|
|
.Xr bpf 4
|
|
.It 'c'
|
|
coda
|
|
.It 'c'
|
|
.Xr \&cd 4
|
|
.It 'c'
|
|
.Xr \&ch 4
|
|
.It 'C'
|
|
clock devices (amiga, atari, hp300, x68k)
|
|
.It 'C'
|
|
.Xr i4bctl 4
|
|
.It 'd'
|
|
the disk subsystem
|
|
.It 'E'
|
|
.Xr envsys 4
|
|
.It 'f'
|
|
files
|
|
.It 'F'
|
|
Sun-compatible framebuffers
|
|
.It 'F'
|
|
.Xr ccd 4
|
|
and
|
|
.Xr vnd 4
|
|
.It 'g'
|
|
qdss framebuffers
|
|
.It 'G'
|
|
grf devices (amiga, atari, hp300, mac68k, x68k)
|
|
.It 'h'
|
|
HIL devices (hp300)
|
|
.It 'H'
|
|
HIL devices (hp300)
|
|
.It 'H'
|
|
HPc framebuffers
|
|
.It 'i'
|
|
a (pseudo) interface
|
|
.It 'I'
|
|
.Xr ite 4
|
|
(mac68k)
|
|
.It 'J'
|
|
ISA joystick interface
|
|
.It 'k'
|
|
Sun-compatible (and other) keyboards
|
|
.It 'K'
|
|
.Xr lkm 4
|
|
.It 'l'
|
|
leo devices (atari)
|
|
.It 'm'
|
|
.Xr mtio 4
|
|
.It 'M'
|
|
mouse devices (atari)
|
|
.It 'M'
|
|
.Xr mlx 4
|
|
.It 'n'
|
|
virtual console device (arm32)
|
|
.It 'n'
|
|
SMB networking
|
|
.It 'O'
|
|
OpenPROM and OpenFirmware
|
|
.It 'p'
|
|
power control (x68k)
|
|
.It 'P'
|
|
parallel port (amiga, x68k)
|
|
.It 'P'
|
|
profiling (arm32)
|
|
.It 'P'
|
|
printer/plotter interface (hp300)
|
|
.It 'P'
|
|
.Xr magma 4
|
|
bpp (sparc)
|
|
.It 'q'
|
|
.Xr altq 9
|
|
.It 'q'
|
|
pmax graphics devices
|
|
.It 'Q'
|
|
.Xr altq 9
|
|
.It 'Q'
|
|
raw SCSI commands
|
|
.It 'r'
|
|
the routing subsystem
|
|
.It 'r'
|
|
.Xr \&md 4
|
|
.It 'R'
|
|
.Xr i4brbch 4
|
|
.It 'R'
|
|
.Xr rnd 4
|
|
.It 's'
|
|
the socket layer
|
|
.It 's'
|
|
satlink devices
|
|
.It 'S'
|
|
SCSI disks (arc, hp300, pmax)
|
|
.It 'S'
|
|
watchdog devices (sh3)
|
|
.It 'S'
|
|
ISA speaker devices
|
|
.It 'S'
|
|
stic devices
|
|
.It 'S'
|
|
scanners
|
|
.It 't'
|
|
the tty layer
|
|
.It 'u'
|
|
user defined ???
|
|
.It 'U'
|
|
scsibus (see
|
|
.Xr scsi 4 )
|
|
.It 'v'
|
|
Sun-compatible
|
|
.Dq firm events
|
|
.It 'V'
|
|
view device (amiga, atari)
|
|
.It 'V'
|
|
sram device (x68k)
|
|
.It 'w'
|
|
watchdog devices
|
|
.It 'W'
|
|
wt devices
|
|
.It 'W'
|
|
wscons devices
|
|
.It 'x'
|
|
bt8xx devices
|
|
.It 'Z'
|
|
ite devices (amiga, atari, x68k)
|
|
.It 'Z'
|
|
passthrough ioctls
|
|
.El
|
|
.It Ar n
|
|
This numbers the ioctl within the group. There may be only one
|
|
.Ar n
|
|
for a given
|
|
.Ar t .
|
|
This is a unsigned 8 bit number.
|
|
.It Ar pt
|
|
This specifies the type of the passed parameter. This one gets internally
|
|
transformed to the size of the parameter, so if you e.g. want to pass
|
|
a structure, then you have to specify that structure and not a pointer
|
|
to it or sizeof(struct foo)
|
|
.El
|
|
.Pp
|
|
In order for the new ioctl to be known to the system it is installed
|
|
in either <sys/ioctl.h> or one of the files that are reached from
|
|
<sys/ioctl.h>.
|
|
.Sh EXAMPLES
|
|
.Bd -literal
|
|
#define FOOIOCTL _IOWR('i',23,int)
|
|
|
|
int a=3;
|
|
error = ioctl(s,FOOICTL, &a);
|
|
.Ed
|
|
.Pp
|
|
Within the ioctl()-routine of the driver, it can be then accessed like
|
|
.Bd -literal
|
|
driver_ioctl(..,cmd,data)
|
|
u_long cmd;
|
|
caddr_t data;
|
|
|
|
...
|
|
switch(cmd) {
|
|
case FOOIOCTL:
|
|
int *a = (int *)data;
|
|
printf(" Value passed: %d\n",a);
|
|
}
|
|
.Ed
|
|
.Sh NOTES
|
|
Note that if you e.g. try to read information from e.g. a ethernet
|
|
driver where the name of the card is included in the third argument
|
|
(e.g. ioctl(s,READFROMETH,struct ifreq *)), then you have to use
|
|
the _IOWR() form not the _IOR(), as passing the name of the card to the
|
|
kernel already consists of writing data.
|
|
.Sh SEE ALSO
|
|
.Xr ioctl 2
|