bionic (9) device_get_softc.9freebsd.gz

Provided by: freebsd-manpages_11.1-3_all bug

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.