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