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fdesc.h revision 1.17 
      1 /*	$NetBSD: fdesc.h,v 1.17 2005/08/30 20:08:01 xtraeme 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)fdesc.h	8.8 (Berkeley) 4/3/95
     35  *
     36  * #Id: fdesc.h,v 1.8 1993/04/06 15:28:33 jsp Exp #
     37  */
     38 
     39 #ifdef _KERNEL
     40 struct fdescmount {
     41 	struct vnode	*f_root;	/* Root node */
     42 };
     43 
     44 #define FD_ROOT		2
     45 #define FD_DEVFD	3
     46 #define FD_STDIN	4
     47 #define FD_STDOUT	5
     48 #define FD_STDERR	6
     49 #define FD_CTTY		7
     50 #define FD_DESC		8
     51 #define FD_MAX		12
     52 
     53 typedef enum {
     54 	Froot,
     55 	Fdevfd,
     56 	Fdesc,
     57 	Flink,
     58 	Fctty
     59 } fdntype;
     60 
     61 struct fdescnode {
     62 	LIST_ENTRY(fdescnode) fd_hash;	/* Hash list */
     63 	struct vnode	*fd_vnode;	/* Back ptr to vnode */
     64 	fdntype		fd_type;	/* Type of this node */
     65 	unsigned	fd_fd;		/* Fd to be dup'ed */
     66 	char		*fd_link;	/* Link to fd/n */
     67 	int		fd_ix;		/* filesystem index */
     68 };
     69 
     70 #define VFSTOFDESC(mp)	((struct fdescmount *)((mp)->mnt_data))
     71 #define	VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
     72 
     73 extern dev_t devctty;
     74 extern void fdesc_init(void);
     75 extern void fdesc_done(void);
     76 extern int fdesc_root(struct mount *, struct vnode **);
     77 extern int fdesc_allocvp(fdntype, int, struct mount *, struct vnode **);
     78 extern int (**fdesc_vnodeop_p)(void *);
     79 extern struct vfsops fdesc_vfsops;
     80 
     81 #ifdef SYSCTL_SETUP_PROTO
     82 SYSCTL_SETUP_PROTO(sysctl_vfs_fdesc_setup);
     83 #endif /* SYSCTL_SETUP_PROTO */
     84 #endif /* _KERNEL */
     85