sg4

Usage

Overview

The sg driver provides a Linux compatible scsi passthru device. This driver attaches to all cam(4) peripheral devices. It is similar to the pass(4) device, but uses the Linux interfaces, rather than the FreeBSD CAM interfaces.

Ioctl

The following subset of the Linux sg ioctl interfaces are implemented:

SG_SET_TIMEOUT

u_int, to Set the timeout in milliseconds.

SG_GET_TIMEOUT

Get the timeout in milliseconds

SG_GET_RESERVED_SIZE

u_int Returns the size of the I/O one can do this device.

SG_GET_SCSI_ID

struct, sg_scsi_id Returns the bus number, channel, scsi bus ID number, lun and other information about the SCSI device.

SG_GET_SG_TABLESIZE

u_int Returns the table size, though hard wired to 0.

SG_GET_VERSION_NUM

u_int Return the version number that is implemented.

SG_IO

struct, sg_io_hdr

All other ioctl interfaces return ENODEV.

Files

/dev/sg*

Passthru devices.