FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/nullfs.c

     /*      $NetBSD: nullfs.c,v 1.7 2003/08/18 15:45:28 dsl Exp $   */
     
     /*-
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
     * 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.
     *
     *      @(#)open.c      8.1 (Berkeley) 6/11/93
     *  
     *
     * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
     * All Rights Reserved.
     *
     * Author: Alessandro Forin
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    #include "stand.h"
    
    /*
     * Null filesystem
     */
    
    int
    null_open(const char *path, struct open_file *f)
    {
    
            return EIO;
    }
    
    #ifndef LIBSA_NO_FS_CLOSE
    int
    null_close(struct open_file *f)
    {
    
            return 0;
    }
    #endif
    
    int
    null_read(struct open_file *f, void *buf, size_t size, size_t *resid)
    {
    
            return EIO;
    }
    
    #ifndef LIBSA_NO_FS_WRITE
    int
    null_write(struct open_file *f, void *buf, size_t size, size_t *resid)
    {
    
            return EIO;
    }
    #endif
   
   #ifndef LIBSA_NO_FS_SEEK
   off_t
   null_seek(struct open_file *f, off_t offset, int where)
   {
   
           return (off_t)-1;
   }
   #endif
   
   int
   null_stat(struct open_file *f, struct stat *sb)
   {
   
           return EIO;
   }

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