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fdesc.h revision 1.9 
      1 /*	$NetBSD: fdesc.h,v 1.9 1996/02/09 22:40:03 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software donated to Berkeley by
      8  * Jan-Simon Pendry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)fdesc.h	8.6 (Berkeley) 8/20/94
     39  *
     40  * #Id: fdesc.h,v 1.8 1993/04/06 15:28:33 jsp Exp #
     41  */
     42 
     43 #ifdef _KERNEL
     44 struct fdescmount {
     45 	struct vnode	*f_root;	/* Root node */
     46 };
     47 
     48 #define FD_ROOT		2
     49 #define FD_DEVFD	3
     50 #define FD_STDIN	4
     51 #define FD_STDOUT	5
     52 #define FD_STDERR	6
     53 #define FD_CTTY		7
     54 #define FD_DESC		8
     55 #define FD_MAX		12
     56 
     57 typedef enum {
     58 	Froot,
     59 	Fdevfd,
     60 	Fdesc,
     61 	Flink,
     62 	Fctty
     63 } fdntype;
     64 
     65 struct fdescnode {
     66 	LIST_ENTRY(fdescnode) fd_hash;	/* Hash list */
     67 	struct vnode	*fd_vnode;	/* Back ptr to vnode */
     68 	fdntype		fd_type;	/* Type of this node */
     69 	unsigned	fd_fd;		/* Fd to be dup'ed */
     70 	char		*fd_link;	/* Link to fd/n */
     71 	int		fd_ix;		/* filesystem index */
     72 };
     73 
     74 #define VFSTOFDESC(mp)	((struct fdescmount *)((mp)->mnt_data))
     75 #define	VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
     76 
     77 extern dev_t devctty;
     78 extern void fdesc_init __P((void));
     79 extern int fdesc_root __P((struct mount *, struct vnode **));
     80 extern int fdesc_allocvp __P((fdntype, int, struct mount *, struct vnode **));
     81 extern int (**fdesc_vnodeop_p) __P((void *));
     82 extern struct vfsops fdesc_vfsops;
     83 #endif /* _KERNEL */
     84