05-18-2012
Device Available / Define state
Hi,
I would like to know wheather it is possible to make device in availabe state?
if for same reason os is not able to make it in available state. and it is in define state.
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LEARN ABOUT FREEBSD
device_unbusy
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