1 /* $NetBSD: open.c,v 1.26 2007/11/24 13:20:56 isaki 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@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 * File primitives proper 67 */ 68 69 #ifdef HELLO_CTAGS 70 oopen(){} 71 #endif 72 73 int 74 #ifndef __INTERNAL_LIBSA_CREAD 75 open(const char *fname, int mode) 76 #else 77 oopen(const char *fname, int mode) 78 #endif 79 { 80 struct open_file *f; 81 int fd, error; 82 #if !defined(LIBSA_SINGLE_FILESYSTEM) 83 int i, besterror; 84 #endif 85 char *file; 86 87 /* find a free file descriptor */ 88 for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++) 89 if (f->f_flags == 0) 90 goto fnd; 91 errno = EMFILE; 92 return -1; 93 fnd: 94 /* 95 * Try to open the device. 96 * Convert open mode (0,1,2) to F_READ, F_WRITE. 97 */ 98 f->f_flags = mode + 1; 99 #if !defined(LIBSA_SINGLE_DEVICE) 100 f->f_dev = (struct devsw *)0; 101 #endif 102 #if !defined(LIBSA_SINGLE_FILESYSTEM) 103 f->f_ops = (struct fs_ops *)0; 104 #endif 105 #if !defined(LIBSA_NO_RAW_ACCESS) 106 f->f_offset = 0; 107 #endif 108 file = (char *)0; 109 error = devopen(f, fname, &file); 110 if (error 111 #if !defined(LIBSA_SINGLE_DEVICE) 112 || (((f->f_flags & F_NODEV) == 0) && 113 f->f_dev == (struct devsw *)0) 114 #endif 115 ) 116 goto err; 117 118 #if !defined(LIBSA_NO_RAW_ACCESS) 119 /* see if we opened a raw device; otherwise, 'file' is the file name. */ 120 if (file == (char *)0 || *file == '\0') { 121 f->f_flags |= F_RAW; 122 return fd; 123 } 124 #endif 125 126 /* pass file name to the different filesystem open routines */ 127 #if !defined(LIBSA_SINGLE_FILESYSTEM) 128 besterror = ENOENT; 129 for (i = 0; i < nfsys; i++) { 130 error = FS_OPEN(&file_system[i])(file, f); 131 if (error == 0) { 132 f->f_ops = &file_system[i]; 133 return fd; 134 } 135 if (error != EINVAL) 136 besterror = error; 137 } 138 error = besterror; 139 #else 140 error = FS_OPEN(&file_system[i])(file, f); 141 if (error == 0) 142 return fd; 143 if (error == EINVAL) 144 error = ENOENT; 145 #endif 146 147 if ((f->f_flags & F_NODEV) == 0) { 148 #if !defined(LIBSA_SINGLE_DEVICE) 149 if (DEV_CLOSE(f->f_dev) != NULL) 150 #endif 151 (void)DEV_CLOSE(f->f_dev)(f); 152 } 153 err: 154 f->f_flags = 0; 155 errno = error; 156 return -1; 157 } 158