device_get_softc.9 revision 112739
-*- nroff -*-
Copyright (c) 1998 Doug Rabson
All rights reserved.
This program is free software.
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.
THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
$FreeBSD: head/share/man/man9/device_get_softc.9 112739 2003-03-28 07:28:31Z imp $
.Dd June 16, 1998 .Dt DEVICE_GET_SOFTC 9 .Os .Sh NAME .Nm device_get_softc .Nd access driver private instance variables .Sh SYNOPSIS n sys/param.h n sys/bus.h .Ft void * .Fn device_get_softc "device_t dev" .Sh DESCRIPTION Return the driver-specific state of .Fa dev . The softc is automatically allocated the first time it is requested. The size of the allocation is determined by the device's .Ft driver_t information used to define the driver. The softc typically encaposlates the state of this instance of the device.
Copyright (c) 1998 Doug Rabson
All rights reserved.
This program is free software.
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.
THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
$FreeBSD: head/share/man/man9/device_get_softc.9 112739 2003-03-28 07:28:31Z imp $
.Dd June 16, 1998 .Dt DEVICE_GET_SOFTC 9 .Os .Sh NAME .Nm device_get_softc .Nd access driver private instance variables .Sh SYNOPSIS n sys/param.h n sys/bus.h .Ft void * .Fn device_get_softc "device_t dev" .Sh DESCRIPTION Return the driver-specific state of .Fa dev . The softc is automatically allocated the first time it is requested. The size of the allocation is determined by the device's .Ft driver_t information used to define the driver. The softc typically encaposlates the state of this instance of the device.
p Driver writers are discouraged from using their own softc management mechanisms. Driver writers should not copy such mechanisms found in drivers in the tree that predates this function. .Sh RETURN VALUES The pointer to the driver-specific instance variable is returned. .Sh SEE ALSO .Xr driver 9 , .Xr device 9 , .Xr device_set_softc 9 .Sh AUTHORS This man page was written by .An Doug Rabson .