SG(4)

NAME
sg - Linux ioctl-compatible SCSI passthru device

SYNOPSIS
device sg
device scbus

DESCRIPTION
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.

SEE ALSO
cam(4), pass(4)

HISTORY
The sg driver first appeared in FreeBSD 7.0.