111 lines
3.1 KiB
Groff
111 lines
3.1 KiB
Groff
.\" $Id: su.4,v 1.10 1997/02/22 13:24:44 peter Exp $
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.\"
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.\" Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd December 29, 1997
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.Dt SSC 4
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.Os FreeBSD
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.Sh NAME
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.Nm ssc
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.Nd The `super scsi' driver
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.Sh SYNOPSIS
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.Cd "pseudo-device ssc"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides an access point into the SCSI driver code that can
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be used when no SCSI devices have previously been detected. This
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is useful for systems that contain only external SCSI devices that
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may be powered off at boot time.
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.Pp
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The
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.Sq scsi user ,
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or
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.Xr su 4
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pseudo-device is used by
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.Nm ssc ,
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and therefore must also be configured.
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.Sh KERNEL CONFIGURATION
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There are no configuration parameters for the ssc pseudo-device.
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.Pp
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.Sh IOCTLS
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The
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.Nm
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driver has a single
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.Dv SCIOCADDR
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ioctl of it's own. This ioctl must be used after opening
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.Pa /dev/ssc
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and before issuing any other ioctl calls:
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.Bd -literal -offset indent
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.Fd #include <sys/scsiio.h>
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.Ft int
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.Fn ioctl "int fd" "SCIOCADDR" "struct scsi_addr *data"
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.Ed
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.Pp
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.Ar Fd
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refers to the descriptor returned by
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.Xr open 2 ,
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and
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.Ar data
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must have the
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.Ar scbus ,
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.Ar target
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and
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.Ar lun
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fields set as required. This ioctl may be used at will to change the
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device to which subsequent ioctls affect.
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.Pp
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All other ioctls are passed directly to the
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.Xr su 4
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pseudo-device driver, using the Bus, Target and Lun that were set
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with the last
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.Dv SCIOCADDR
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ioctl call.
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.Sh FILES
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.Bl -tag -width /dev/ssc -compact
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.It Pa /dev/ssc
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The device file used to access the
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.Sq super scsi
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driver.
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.El
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.Sh DIAGNOSTICS
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If any ioctl is attempted before issuing a
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.Dv SCIOCADDR
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ioctl,
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.Dv ENXIO
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is returned. Otherwise, the ioctl is passed directly to the
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.Xr su 4
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driver.
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.Sh SEE ALSO
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.Xr open 2 ,
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.Xr scsi 8 ,
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.Xr su 4
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.Sh HISTORY
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The
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.Nm
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driver originally appeared in FreeBSD 2.0.5.
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