saio.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*
 * Header file for standalone package
 */

/*	@(#)saio.h	4.1	(ULTRIX)	7/2/90	*/
/************************************************************************
 *									*
 *			Copyright (c) 1985 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/
#include "../ufs/fs.h"
/*
 * Io block: includes an
 * inode, cells for the use of seek, etc,
 * and a buffer.
 */
struct	iob {
	int	i_flgs;		/* see F_ below */
	struct	gnode i_ino;	/* inode, if file */
	int	i_unit;		/* pseudo device unit */
	daddr_t	i_boff;		/* block offset on device */
	daddr_t	i_cyloff;	/* cylinder offset on device */
	off_t	i_offset;	/* seek offset in file */
	daddr_t	i_bn;		/* 1st block # of next read */
	char	*i_ma;		/* memory address of i/o buffer */
	int	i_cc;		/* character count of transfer */
	int	i_error;	/* error # return */
	int	i_errcnt;	/* error count for driver retries */
	int	i_errblk;	/* block # in error for error reporting */
	char	i_buf[MAXBSIZE];/* i/o buffer */
	union {
		struct fs ui_fs;	/* file system super block info */
		char dummy[SBSIZE];
	} i_un;
};
#define i_fs i_un.ui_fs
#define NULL 0

#define F_READ		0x1	/* file opened for reading */
#define F_WRITE		0x2	/* file opened for writing */
#define F_ALLOC		0x4	/* buffer allocated */
#define F_FILE		0x8	/* file instead of device */
#define F_NBSF		0x10	/* no bad sector forwarding */
#define F_ECCLM		0x20	/* limit # of bits in ecc correction */
#define F_SSI		0x40	/* set skip sector inhibit */
#define F_SEVRE		0x80	/* Severe burnin (no retries, no ECC) */
/* io types */
#define	F_RDDATA	0x0100	/* read data */
#define	F_WRDATA	0x0200	/* write data */
#define F_HDR		0x0400	/* include header on next i/o */
#define F_CHECK		0x0800	/* perform check of data read/write */
#define F_HCHECK	0x1000	/* perform check of header and data */

#define	F_TYPEMASK	0xff00

/*
 *	dv_flags definitions
 */

#define	READ	1
#define	WRITE	2

#define	NBUFS	4

char	b[NBUFS][MAXBSIZE];
daddr_t	blknos[NBUFS];

#define	NFILES	1
struct iob iob[NFILES];

extern	int errno;	/* just like unix */

/* error codes */
#define	EBADF	1	/* bad file descriptor */
#define	EOFFSET	2	/* relative seek not supported */
#define	EDEV	3	/* improper device specification on open */
#define	ENXIO	4	/* unknown device specified */
#define	EUNIT	5	/* improper unit specification */
#define	ESRCH	6	/* directory search for file failed */
#define	EIO	7	/* generic error */
#define	ECMD	10	/* undefined driver command */
#define	EBSE	11	/* bad sector error */
#define	EWCK	12	/* write check error */
#define	EECC	13	/* uncorrectable ecc error */
#define	EHER	14	/* hard error */