Home | History | Annotate | Line # | Download | only in libsa 
      1 /*	$NetBSD: nullfs.c,v 1.12 2014/03/20 03:13:18 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * The Mach Operating System project at Carnegie-Mellon University.
      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  *	@(#)open.c	8.1 (Berkeley) 6/11/93
     35  *
     36  *
     37  * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
     38  * All Rights Reserved.
     39  *
     40  * Author: Alessandro Forin
     41  *
     42  * Permission to use, copy, modify and distribute this software and its
     43  * documentation is hereby granted, provided that both the copyright
     44  * notice and this permission notice appear in all copies of the
     45  * software, derivative works or modified versions, and any portions
     46  * thereof, and that both notices appear in supporting documentation.
     47  *
     48  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     49  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     50  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     51  *
     52  * Carnegie Mellon requests users of this software to return to
     53  *
     54  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     55  *  School of Computer Science
     56  *  Carnegie Mellon University
     57  *  Pittsburgh PA 15213-3890
     58  *
     59  * any improvements or extensions that they make and grant Carnegie the
     60  * rights to redistribute these changes.
     61  */
     62 
     63 #include "stand.h"
     64 
     65 /*
     66  * Null filesystem
     67  */
     68 
     69 __compactcall int
     70 null_open(const char *path, struct open_file *f)
     71 {
     72 
     73 	return EIO;
     74 }
     75 
     76 #ifndef LIBSA_NO_FS_CLOSE
     77 __compactcall int
     78 null_close(struct open_file *f)
     79 {
     80 
     81 	return 0;
     82 }
     83 #endif
     84 
     85 __compactcall int
     86 null_read(struct open_file *f, void *buf, size_t size, size_t *resid)
     87 {
     88 
     89 	return EIO;
     90 }
     91 
     92 #ifndef LIBSA_NO_FS_WRITE
     93 __compactcall int
     94 null_write(struct open_file *f, void *buf, size_t size, size_t *resid)
     95 {
     96 
     97 	return EIO;
     98 }
     99 #endif
    100 
    101 #ifndef LIBSA_NO_FS_SEEK
    102 __compactcall off_t
    103 null_seek(struct open_file *f, off_t offset, int where)
    104 {
    105 
    106 	return (off_t)-1;
    107 }
    108 #endif
    109 
    110 __compactcall int
    111 null_stat(struct open_file *f, struct stat *sb)
    112 {
    113 
    114 	return EIO;
    115 }
    116 
    117 #if defined(LIBSA_ENABLE_LS_OP)
    118 #include "ls.h"
    119 __compactcall void
    120 null_ls(struct open_file *f, const char *pattern)
    121 {
    122 	lsunsup("nullfs");
    123 }
    124 #endif
    125