[unix-history] / usr / src / sys / stand / stand.h

/*-
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)stand.h     7.1 (Berkeley) %G%
*/

#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <stand/saioctl.h>

#define UNIX    "/vmunix"

#ifndef NULL
#define NULL    0
#endif

extern int errno;

struct open_file;

/*
* This structure is used to define file system operations in a file system
* independent way.
*/
struct fs_ops {
       int     (*open) __P((char *path, struct open_file *f));
       int     (*close) __P((struct open_file *f));
       int     (*read) __P((struct open_file *f, char *buf,
                       u_int size, u_int *resid));
       int     (*write) __P((struct open_file *f, char *buf,
                       u_int size, u_int *resid));
       off_t   (*seek) __P((struct open_file *f, off_t offset, int where));
       int     (*stat) __P((struct open_file *f, struct stat *sb));
};

extern struct fs_ops file_system[];

/* where values for lseek(2) */
#define SEEK_SET        0       /* set file offset to offset */
#define SEEK_CUR        1       /* set file offset to current plus offset */
#define SEEK_END        2       /* set file offset to EOF plus offset */

/* Device switch */
struct devsw {
       char    *dv_name;
       int     (*dv_strategy) __P((void *devdata, int rw,
                       daddr_t blk, u_int size, char *buf, u_int *rsize));
       int     (*dv_open)();   /* (struct open_file *f, ...) */
       int     (*dv_close) __P((struct open_file *f));
       int     (*dv_ioctl) __P((struct open_file *f, int cmd, void *data));
};

extern struct devsw devsw[];    /* device array */
extern int ndevs;               /* number of elements in devsw[] */

struct open_file {
       int             f_flags;        /* see F_* below */
       struct devsw    *f_dev;         /* pointer to device operations */
       void            *f_devdata;     /* device specific data */
       struct fs_ops   *f_ops;         /* pointer to file system operations */
       void            *f_fsdata;      /* file system specific data */
};

#define SOPEN_MAX       4
extern struct open_file files[SOPEN_MAX];

/* f_flags values */
#define F_READ          0x0001  /* file opened for reading */
#define F_WRITE         0x0002  /* file opened for writing */
#define F_RAW           0x0004  /* raw device open - no file system */

int     devopen __P((struct open_file *f, char *fname, char **file));
void    *alloc __P((unsigned size));
void    free __P((void *ptr, unsigned size));
struct  disklabel;
char    *getdisklabel __P((const char *buf, struct disklabel *lp));