autochanger.7 (2010 09)

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autochanger(7) autochanger(7)

operation. Movement from this type of location is a physical-media-unmount

operation.

media transport A location for media movement. Media is generally temporarily located in this

type of element only during actual media movement.

Changer Control Requests

The following ioctl functions and structure deﬁnitions are included from

<sys/scsi.h>:

#define SIOC_INIT_ELEM_STAT _IO(’S’, 51)

#define SIOC_ELEMENT_ADDRESSES _IOW(’S’, 52, struct element_addresses)

#define SIOC_ELEMENT_STATUS _IOWR(’S’, 53, struct element_status)

#define SIOC_RESERVE _IOW(’S’, 54, struct reservation_parms)

#define SIOC_RELEASE _IOW(’S’, 55, struct reservation_parms)

#define SIOC_MOVE_MEDIUM _IOW(’S’, 56, struct move_medium_parms)

#define SIOC_EXCHANGE_MEDIUM _IOW(’S’, 57, struct exchange_medium_parms)

/* structure for SIOC_ELEMENT_ADDRESSES ioctl */

struct element_addresses {

unsigned short first_transport;

unsigned short num_transports;

unsigned short first_storage;

unsigned short num_storages;

unsigned short first_import_export;

unsigned short num_import_exports;

unsigned short first_data_transfer;

unsigned short num_data_transfers;

};

/* structure for SIOC_ELEMENT_STATUS ioctl */

struct element_status {

unsigned short element; /* element address */

unsigned int resv1:2;

unsigned int import_enable:1; /* allows media insertion (load) */

unsigned int export_enable:1; /* allows media removal (eject) */

unsigned int access:1; /* transport element accessible */

unsigned int except:1; /* is in an abnormal state */

unsigned int operatr:1; /* medium positioned by operator */

unsigned int full:1; /* holds a a unit of media */

unsigned char resv2;

unsigned char sense_code; /* info. about abnormal state */

unsigned char sense_qualifier; /* info. about abnormal state */

unsigned int not_bus:1; /* transfer device SCSI bus differs */

unsigned int resv3:1;

unsigned int id_valid:1; /* bus_address is valid */

unsigned int lu_valid:1; /* lun is valid */

unsigned int sublu_valid:1; /* sub_lun is valid */

unsigned int lun:3; /* transfer device SCSI LUN */

unsigned char bus_address; /* transfer device SCSI address */

unsigned char sub_lun; /* sub-logical unit number */

unsigned int source_valid:1; /* source_element is valid */

unsigned int invert:1; /* media in element was inverted */

unsigned int resv4:6;

unsigned short source_element; /* last storage medium location */

char pri_vol_tag[36]; /* volume tag (device optional) */

char alt_vol_tag[36]; /* volume tag (device optional) */

unsigned char misc_bytes[168]; /* device specific */

};

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