/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */
#include <sys/fcntl.h>

#ifndef _SYS_FILE_H_
#define _SYS_FILE_H_

/*
 * Descriptor table entry.
 * One for each kernel object.
 */
struct  file {
    int     f_flag;         /* see below */
    int     f_type;         /* descriptor type */
    u_int   f_count;        /* reference count */
    int     f_msgcount;     /* references from message queue */
    union {
        caddr_t f_Data;
        struct socket *f_Socket;
    } f_un;
    off_t   f_offset;
};

#ifdef KERNEL
struct uio;

struct  fileops {
    int (*fo_rw) (struct file *fp, struct uio *uio);
    int (*fo_ioctl) (struct file *fp, u_int com, char *data);
    int (*fo_select) (struct file *fp, int flag);
    int (*fo_close) (struct file *fp);
};

#define f_data      f_un.f_Data
#define f_socket    f_un.f_Socket

extern struct file file[];
extern const struct fileops *const Fops[];
extern const struct fileops inodeops;
extern const struct fileops pipeops;

/*
 * Convert a user supplied file descriptor into a pointer to a file structure.
 */
struct file *getf (int f);

/*
 * Allocate a user file descriptor and a file structure.
 */
struct file *falloc (void);

/*
 * Internal form of close.
 */
int closef (struct file *fp);

/*
 * Set/clear file flags: nonblock and async.
 */
int fset (struct file *fp, int bit, int value);

/*
 * Get/set process group id for a file.
 */
int fgetown (struct file *fp, int *valuep);
int fsetown (struct file *fp, int value);

/*
 * File table inode close routine.
 */
int vn_closefile (struct file *fp);

/*
 * Place an advisory lock on an inode.
 */
int ino_lock (struct file *fp, int cmd);

/*
 * Unlock a file.
 */
void ino_unlock (struct file *fp, int kind);

int ino_ioctl (struct file *fp, u_int com, caddr_t data);

#else /* KERNEL */

int flock(int fd, int operation);

#endif /* KERNEL */

/*
 * Access call.
 */
#define F_OK    0   /* does file exist */
#define X_OK    1   /* is it executable by caller */
#define W_OK    2   /* writable by caller */
#define R_OK    4   /* readable by caller */

/*
 * Lseek call.
 */
#define L_SET   0   /* absolute offset */
#define L_INCR  1   /* relative to current offset */
#define L_XTND  2   /* relative to end of file */

#ifdef KERNEL
#define GETF(fp, fd) { \
    if ((unsigned)(fd) >= NOFILE || ((fp) = u.u_ofile[fd]) == NULL) { \
        u.u_error = EBADF; \
        return; \
    } \
}
#define DTYPE_INODE     1   /* file */
#define DTYPE_SOCKET    2   /* communications endpoint */
#define DTYPE_PIPE      3   /* I don't want to hear it, okay? */
#endif
#endif  /* _SYS_FILE_H_ */