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Test Your Knowledge in Computers #668
Difficulty: Medium
IEEE 802.11 is part of the IEEE 802 set of LAN protocols, and specifies the set of media access control (MAC) and physical layer (PHY) protocols for implementing virtual local area network (VLAN) Wi-Fi computer communication in various frequencies.
True or False?
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device_disable(9) [freebsd man page]

DEVICE_ENABLE(9)					   BSD Kernel Developer's Manual					  DEVICE_ENABLE(9)

NAME
device_enable, device_disable, device_is_enabled -- manipulate device enabled flag SYNOPSIS
#include <sys/param.h> #include <sys/bus.h> void device_enable(device_t dev); void device_disable(device_t dev); int device_is_enabled(device_t dev); DESCRIPTION
Each device has an enabled flag associated with it. A device is enabled by default when it is created but may be disabled (for instance to prevent a destructive or time consuming probe attempt). To disable a device, call device_disable(), to re-enable it, call device_enable() and to test to see if a device is enabled, call device_is_enabled(). SEE ALSO
device(9) AUTHORS
This manual page was written by Doug Rabson. BSD
June 16, 1998 BSD

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DEVICE_GET_STATE(9)					   BSD Kernel Developer's Manual				       DEVICE_GET_STATE(9)

NAME
device_get_state, device_busy, device_unbusy, device_is_alive, device_is_attached -- manipulate device state SYNOPSIS
#include <sys/param.h> #include <sys/bus.h> device_state_t device_get_state(device_t dev); void device_busy(device_t dev); void device_unbusy(device_t dev); int device_is_alive(device_t dev); int device_is_attached(device_t dev); DESCRIPTION
The current state of a device is accessed by calling device_get_state() which returns DS_NOTPRESENT, DS_ALIVE, DS_ATTACHED or DS_BUSY (described in device(9)). To test see if a device was successfully probed, call device_is_alive() which simply returns if the state is greater or equal to DS_ALIVE. To test see if a device was successfully attached, call device_is_attached() which simply returns if the state is greater or equal to DS_ATTACHED. Each device has a busy count which is incremented when device_busy() is called and decremented when device_unbusy() is called. Both routines return an error if the device state is less than DS_ATTACHED. When device_busy() is called on a device in the DS_ATTACHED state, the device changes to the DS_BUSY state. When device_unbusy() is called and after decrementing, the busy count for the device is zero, the device changes to the DS_ATTACHED state. SEE ALSO
device(9) AUTHORS
This manual page was written by Doug Rabson. BSD
June 16, 1998 BSD

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