sys/stand/saio.h

/*      saio.h  4.4     3/15/81 */

/*
 * header file for standalone package
 */

/*
 * io block: includes an
 * inode, cells for the use of seek, etc,
 * and a buffer.
 */
struct  iob {
        char    i_flgs;
        struct  inode i_ino;
        int     i_unit;
        daddr_t i_boff;
        daddr_t i_cyloff;
        off_t   i_offset;
        daddr_t i_bn;
        char    *i_ma;
        int     i_cc;
        char    i_buf[BSIZE];
};

#define F_READ  01
#define F_WRITE 02
#define F_ALLOC 04
#define F_FILE  010

/*
 * dev switch
 */
struct devsw {
        char    *dv_name;
        int     (*dv_strategy)();
        int     (*dv_open)();
        int     (*dv_close)();
};

struct devsw devsw[];

/*
 * request codes. Must be the same a F_XXX above
 */
#define READ    1
#define WRITE   2

#define NBUFS   4

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

#define NFILES  4
struct  iob iob[NFILES];