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Man Pages


Manual Reference Pages  -  DEVICE_UNBUSY (9)

NAME

device_get_state, device_busy, device_unbusy, device_is_alive, device_is_attached - manipulate device state

CONTENTS

Synopsis
Description
See Also
Authors

SYNOPSIS


.In sys/param.h
.In 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
.An Doug Rabson .
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