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/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/*
History:
Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
process control of SCSI devices.
Development Sponsored by Killy Corp. NY NY
*/
#ifndef _SCSI_SG_H
#define _SCSI_SG_H 1
/* An SG device is accessed by writing "packets" to it, the replies
are then read using the read call. The same header is used for
replies; ignore the reply_len field. */
struct sg_header
{
int pack_len; /* length of incoming packet
(including header). */
int reply_len; /* max length of expected reply. */
int pack_id; /* id number of packet. */
int result; /* 0==ok, otherwise error number. */
unsigned int twelve_byte:1; /* force 12 byte command length for
group 6 & 7 commands. */
unsigned int other_flags:31; /* for future use. */
unsigned char sense_buffer[16]; /* used only by reads. */
/* command follows then data for command. */
};
/* ioctl's */
#define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */
#define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */
#define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */
#define SG_DEFAULT_RETRIES 1
#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
changed if sufficient DMA buffer room available. */
#define SG_BIG_BUFF 32768
#endif /* scsi/sg.h */
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