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device(9s)


NAME

  device - General: Contains information that identifies the device. One
  device data structure exists for each device connected to the controller.


SYNOPSIS

  _________________________________
  Member Name	Data Type
  _________________________________
  nxt_dev	struct device *
  ctlr_hd	struct controller *
  dev_type	char *
  dev_name	char *
  logunit	int
  unit		int
  ctlr_name	char *
  ctlr_num	int
  alive		int
  private	void * [8]
  conn_priv	void * [8]
  rsvd		void * [8]
  _________________________________


MEMBERS

  nxt_dev
      Specifies a pointer to the next device at this level.

  ctlr_hd
      Specifies a pointer to the controller structure to which this device is
      connected.

  dev_type
      Specifies the device type (for example, disk or tape).

  dev_name
      This member is set to the device name type, which is a string of up to
      8 characters. For example, Compaq defines the strings rz and tz to
      represent disk and tape devices, respectively.

  logunit
      Specifies the device logical unit number.

  unit
      Specifies the device physical unit number.

  ctlr_name
      Specifies the name of the controller to which this device is connected.

  ctlr_num
      Specifies the number of the controller to which this device is
      connected.

  alive
      Specifies a flag word to indicate the current status of the device.

  private
      Specifies private storage for use by this device or device class.

  conn_priv
      Specifies private storage for use by the controller to which this
      device is connected.

  rsvd
      This member is reserved for future expansion of the data structure.


DESCRIPTION

  The device data structure represents an instance of a device entity. A
  device is an entity that connects to and is controlled by a controller. A
  device does not connect directly to a bus.

  The device and the driver determine the contents of this structure.  That
  is, the driver can store any information that it needs for accessing the
  device.


FILES

  <io/common/devdriver.h>


SEE ALSO

  Data Structures: bus(9s), controller(9s), driver(9s)

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