HP-UX Reference (11i v2 03/08) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

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scsi(7) scsi(7)

device control (see scsi_ctl (7)).

Drivers that support only devices which have no meaningful size may not support the

SIOC_CAPACITY

ioctl. Total device size in bytes may exceed 2

−1 for some devices.

DEPENDENCIES

sdisk/schgr/sﬂop/stape

The

SIOC_EXCLUSIVE

ioctl may be used to obtain and release exclusive access. Exclusive access,

which prevents simultaneous access by other applications, is required for some operations and may be

desirable in other circumstances. The following exclusive access control arguments are supported:

0 Release exclusive access to logical unit (LUN).

1 Gain exclusive access to logical unit (LUN).

2 Release exclusive access to associated SCSI target.

3 Gain exclusive access to associated SCSI target.

4 Release exclusive access to associated SCSI bus.

5 Gain exclusive access to associated SCSI bus.

The

SIOC_MEDIUM_CHANGED

ioctl indicates when the media in a removable-media device may have

changed. A value of ‘‘1’’ indicates the device media may have changed since the last

SIOC_MEDIUM_CHANGED

ioctl call. Note that only the ﬁrst such call after a media change receives this

indication. This means that media changes are likely to be missed if multiple applications are attempting

to detect media changes. Exclusive access, obtained through use of the

SIOC_EXCLUSIVE

ioctl, can be

used to avoid this problem.

The following information is included from

<sys/scsi.h>:

#define SIOC_MEDIUM_CHANGED _IOR(’S’, 42, int)

#define SIOC_EXCLUSIVE _IOR(’S’, 68, int)

disc3

The SIOC_VPD_INQUIRY

ioctl allows access to detailed device speciﬁc information. The page_code

ﬁeld speciﬁes which SCSI vital product data page is requested. The page_buf ﬁeld is ﬁlled with the

requested page data.

The following information is included from

<sys/scsi.h>:

#define SIOC_VPD_INQUIRY _IOWR(’S’, 10, struct vpd_inquiry)

/* union for SIOC_VPD_INQUIRY ioctl */

struct vpd_inquiry {

char page_code; /* VPD page code */

char page_buf[126]; /* buffer for VPD page info */

};

FILES

/usr/include/sys/scsi.h