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sg: Add sg(4) man page
Add minimal sg(4) manual page. This implements a subset of the Linux IOCTL interface for either native FreeBSD programs, or for Linux binaries in the linuxulator. Noticed by: Lexi Winter Sponsored by: Netflix
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@ -494,6 +494,7 @@ MAN= aac.4 \
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send.4 \
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ses.4 \
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${_sfxge.4} \
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sg.4 \
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sge.4 \
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siba.4 \
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siftr.4 \
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63
share/man/man4/sg.4
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63
share/man/man4/sg.4
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@ -0,0 +1,63 @@
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.\"
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.\" Copyright (c) 2024 Netflix, Inc.
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.\"
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.\" SPDX-License-Expression: BSD-2-Clause
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.\"
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.Dd May 6, 2024
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.Dt SG 4
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.Os
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.Sh NAME
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.Nm sg
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.Nd Linux ioclt-compatible SCSI passthru device
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.Sh SYNOPSIS
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.Cd device sg
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.Cd device scbus
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.Sh DESCRIPTION
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The
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.Nm
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driver provides a Linux compatible scsi passthru device.
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This driver attaches to all
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.Xr cam 4
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peripheral devices.
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It is similar to the
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.Xr pass 4
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device, but uses the Linux interfaces, rather than the FreeBSD CAM interfaces.
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.Sh IOCTL
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The following subset of the Linux sg ioctl interfaces are implemented:
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.Bl -tag -width 12
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.It Va SG_SET_TIMEOUT
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.Fa u_int to
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Set the timeout in milliseconds.
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.It Va SG_GET_TIMEOUT
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Get the timeout in milliseconds
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.It Va SG_GET_RESERVED_SIZE
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.Fa u_int
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Returns the size of the I/O one can do this device.
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.It Va SG_GET_SCSI_ID
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.Fa struct sg_scsi_id
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Returns the bus number, channel, scsi bus ID number, lun and other information
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about the SCSI device.
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.It Va SG_GET_SG_TABLESIZE
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.Fa u_int
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Returns the table size, though hard wired to 0.
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.It Va SG_GET_VERSION_NUM
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.Fa u_int
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Return the version number that is implemented.
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.It Va SG_IO
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.Fa struct sg_io_hdr
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.El
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All other ioctl interfaces return
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.Va ENODEV .
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.Sh FILES
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.Bl -tag -width ".Pa /dev/sg*" -compact
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.It Pa /dev/sg*
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Passthru devices.
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.El
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.Sh SEE ALSO
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.Xr cam 4 ,
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.Xr pass 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 7.0 .
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