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Command: device_get_softc | Section: 9 | Source: FreeBSD | File: device_get_softc.9.gz
DEVICE_GET_SOFTC(9) FreeBSD Kernel Developer's Manual DEVICE_GET_SOFTC(9)
NAME
device_get_softc - access driver private instance variables
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
void *
device_get_softc(device_t dev);
DESCRIPTION
Return the driver-specific software context of dev. The softc is
automatically allocated and zeroed when the device is attached. The
softc is also initialized and present when a device is probed, but is
subject to caveats as described in DEVICE_PROBE(9). The size of the
allocation is determined by the device's driver_t information used to
define the driver. The softc typically encapsulates the state of this
instance of the device.
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 predate this function.
RETURN VALUES
The pointer to the driver-specific instance variable is returned.
SEE ALSO
device(9), DEVICE_PROBE(9), device_set_softc(9), driver(9)
AUTHORS
This manual page was written by Doug Rabson.
FreeBSD 14.1-RELEASE-p8 January 21, 2015 FreeBSD 14.1-RELEASE-p8