/*      $NetBSD: fdesc.h,v 1.23 2020/01/17 20:08:09 ad Exp $    */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)fdesc.h     8.8 (Berkeley) 4/3/95
 *
 * #Id: fdesc.h,v 1.8 1993/04/06 15:28:33 jsp Exp #
 */

#ifdef _KERNEL

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

#define VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)

#define FDESC_MAXNAMLEN 255

extern dev_t devctty;
extern void fdesc_init(void);
extern void fdesc_done(void);
extern int fdesc_root(struct mount *, int, struct vnode **);
extern int fdesc_allocvp(fdntype, int, struct mount *, struct vnode **);
extern int (**fdesc_vnodeop_p)(void *);
extern struct vfsops fdesc_vfsops;

#endif /* _KERNEL */