usr/src/sys/miscfs/fdesc/fdesc.h

/*
 * Copyright (c) 1992 The Regents of the University of California
 * Copyright (c) 1990, 1992 Jan-Simon Pendry
 * All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)fdesc.h     7.2 (Berkeley) %G%
 *
 * $Id: fdesc.h,v 1.8 1993/04/06 15:28:33 jsp Exp $
 */

#ifdef KERNEL
struct fdescmount {
        struct vnode    *f_root;        /* Root node */
};

#define FD_ROOT         2
#define FD_DEVFD        3
#define FD_STDIN        4
#define FD_STDOUT       5
#define FD_STDERR       6
#define FD_CTTY         7
#define FD_DESC         8
#define FD_MAX          12

typedef enum {
        Froot,
        Fdevfd,
        Fdesc,
        Flink,
        Fctty
} fdntype;

struct fdescnode {
        fdntype         fd_type;        /* Type of this node */
        unsigned        fd_fd;          /* Fd to be dup'ed */
        char            *fd_link;       /* Link to fd/n */
        int             fd_ix;          /* filesystem index */
};

#define VFSTOFDESC(mp)  ((struct fdescmount *)((mp)->mnt_data))
#define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)

extern dev_t devctty;
extern int fdesc_allocvp __P((fdntype, int, struct mount *, struct vnode **));
extern int (**fdesc_vnodeop_p)();
extern struct vfsops fdesc_vfsops;
#endif /* KERNEL */