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fdesc.h revision 1.4 
      1 /*
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software donated to Berkeley by
      6  * Jan-Simon Pendry.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	from: Id: fdesc.h,v 1.8 1993/04/06 15:28:33 jsp Exp
     37  *	from: @(#)fdesc.h	8.5 (Berkeley) 1/21/94
     38  *	$Id: fdesc.h,v 1.4 1994/06/08 11:33:12 mycroft Exp $
     39  */
     40 
     41 #ifdef KERNEL
     42 struct fdescmount {
     43 	struct vnode	*f_root;	/* Root node */
     44 };
     45 
     46 #define FD_ROOT		2
     47 #define FD_DEVFD	3
     48 #define FD_STDIN	4
     49 #define FD_STDOUT	5
     50 #define FD_STDERR	6
     51 #define FD_CTTY		7
     52 #define FD_DESC		8
     53 #define FD_MAX		12
     54 
     55 typedef enum {
     56 	Froot,
     57 	Fdevfd,
     58 	Fdesc,
     59 	Flink,
     60 	Fctty
     61 } fdntype;
     62 
     63 struct fdescnode {
     64 	struct fdescnode *fd_forw;	/* Hash chain */
     65 	struct fdescnode *fd_back;
     66 	struct vnode	*fd_vnode;	/* Back ptr to vnode */
     67 	fdntype		fd_type;	/* Type of this node */
     68 	unsigned	fd_fd;		/* Fd to be dup'ed */
     69 	char		*fd_link;	/* Link to fd/n */
     70 	int		fd_ix;		/* filesystem index */
     71 };
     72 
     73 #define VFSTOFDESC(mp)	((struct fdescmount *)((mp)->mnt_data))
     74 #define	VTOFDESC(vp) ((struct fdescnode *)(vp)->v_data)
     75 
     76 extern dev_t devctty;
     77 extern int fdesc_init __P((void));
     78 extern int fdesc_root __P((struct mount *, struct vnode **));
     79 extern int fdesc_allocvp __P((fdntype, int, struct mount *, struct vnode **));
     80 extern int (**fdesc_vnodeop_p)();
     81 extern struct vfsops fdesc_vfsops;
     82 #endif /* KERNEL */
     83