DEVICE_GET_CHILDREN(9) BSD Kernel Developer's Manual DEVICE_GET_CHILDREN(9)NAME
device_get_children -- get a list of devices connected to a device
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
int
device_get_children(device_t dev, device_t **devlistp, int *devcountp);
DESCRIPTION
Retrieve a list of all device instances currently connected to dev and return the list in *devlistp and the count in *devcountp. The memory
allocated for the list should be freed using free(*devlistp, M_TEMP). devlistp and devcountp are not changed when an error is returned.
RETURN VALUES
Zero is returned on success, otherwise an appropriate error is returned.
SEE ALSO devclass(9), device(9)AUTHORS
This manual page was written by Doug Rabson.
BSD August 23, 2008 BSD
Check Out this Related Man Page
BUS_CHILD_PRESENT(9) BSD Kernel Developer's Manual BUS_CHILD_PRESENT(9)NAME
bus_child_present -- ask the bus driver to see if this device is still really present
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
int
bus_child_present(device_t dev);
DESCRIPTION
The bus_child_present() function requests that the parent device driver of dev check to see if the hardware represented by dev is still phys-
ically accessible at this time. While the notion of accessible varies from bus to bus, generally hardware that is not accessible cannot be
accessed via the bus_space*() methods that would otherwise be used to access the device.
This does not ask the question ``does this device have children?'' which can better be answered by device_get_children(9).
RETURN VALUES
A zero return value indicates that the device is not present in the system. A non-zero return value indicates that the device is present in
the system, or that the state of the device cannot be determined.
EXAMPLES
This is some example code. It only calls stop when the dc(4) device is actually present.
device_t dev;
dc_softc *sc;
sc = device_get_softc(dev);
if (bus_child_present(dev))
dc_stop(sc);
SEE ALSO device(9), driver(9)AUTHORS
This manual page was written by Warner Losh <imp@FreeBSD.org>.
BSD March 27, 2003 BSD
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