/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)file.h	8.2 (Berkeley) 08/20/94
 */

#include <sys/fcntl.h>
#include <sys/unistd.h>

#ifdef KERNEL
#include <sys/queue.h>

struct proc;
struct uio;

/*
 * Kernel descriptor table.
 * One entry for each open kernel vnode and socket.
 */
struct file {
	LIST_ENTRY(file) f_list;/* list of active files */
	short	f_flag;		/* see fcntl.h */
#define	DTYPE_VNODE	1	/* file */
#define	DTYPE_SOCKET	2	/* communications endpoint */
	short	f_type;		/* descriptor type */
	short	f_count;	/* reference count */
	short	f_msgcount;	/* references from message queue */
	struct	ucred *f_cred;	/* credentials associated with descriptor */
	struct	fileops {
		int	(*fo_read)	__P((struct file *fp, struct uio *uio,
					    struct ucred *cred));
		int	(*fo_write)	__P((struct file *fp, struct uio *uio,
					    struct ucred *cred));
		int	(*fo_ioctl)	__P((struct file *fp, int com,
					    caddr_t data, struct proc *p));
		int	(*fo_select)	__P((struct file *fp, int which,
					    struct proc *p));
		int	(*fo_close)	__P((struct file *fp, struct proc *p));
	} *f_ops;
	off_t	f_offset;
	caddr_t	f_data;		/* vnode or socket */
};

LIST_HEAD(filelist, file);
extern struct filelist filehead;	/* head of list of open files */
extern int maxfiles;			/* kernel limit on number of open files */
extern int nfiles;			/* actual number of open files */

#endif /* KERNEL */