1 /* $NetBSD: open.c,v 1.23 2003/08/07 16:32:29 agc 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(fname, mode) 76 #else 77 oopen(fname, mode) 78 #endif 79 const char *fname; 80 int mode; 81 { 82 struct open_file *f; 83 int fd, error; 84 #if !defined(LIBSA_SINGLE_FILESYSTEM) 85 int i, besterror; 86 #endif 87 char *file; 88 89 /* find a free file descriptor */ 90 for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++) 91 if (f->f_flags == 0) 92 goto fnd; 93 errno = EMFILE; 94 return (-1); 95 fnd: 96 /* 97 * Try to open the device. 98 * Convert open mode (0,1,2) to F_READ, F_WRITE. 99 */ 100 f->f_flags = mode + 1; 101 #if !defined(LIBSA_SINGLE_DEVICE) 102 f->f_dev = (struct devsw *)0; 103 #endif 104 #if !defined(LIBSA_SINGLE_FILESYSTEM) 105 f->f_ops = (struct fs_ops *)0; 106 #endif 107 #if !defined(LIBSA_NO_RAW_ACCESS) 108 f->f_offset = 0; 109 #endif 110 file = (char *)0; 111 error = devopen(f, fname, &file); 112 if (error 113 #if !defined(LIBSA_SINGLE_DEVICE) 114 || (((f->f_flags & F_NODEV) == 0) && 115 f->f_dev == (struct devsw *)0) 116 #endif 117 ) 118 goto err; 119 120 #if !defined(LIBSA_NO_RAW_ACCESS) 121 /* see if we opened a raw device; otherwise, 'file' is the file name. */ 122 if (file == (char *)0 || *file == '\0') { 123 f->f_flags |= F_RAW; 124 return (fd); 125 } 126 #endif 127 128 /* pass file name to the different filesystem open routines */ 129 #if !defined(LIBSA_SINGLE_FILESYSTEM) 130 besterror = ENOENT; 131 for (i = 0; i < nfsys; i++) { 132 error = FS_OPEN(&file_system[i])(file, f); 133 if (error == 0) { 134 f->f_ops = &file_system[i]; 135 return (fd); 136 } 137 if (error != EINVAL) 138 besterror = error; 139 } 140 error = besterror; 141 #else 142 error = FS_OPEN(&file_system[i])(file, f); 143 if (error == 0) 144 return (fd); 145 if (error == EINVAL) 146 error = ENOENT; 147 #endif 148 149 if ((f->f_flags & F_NODEV) == 0) { 150 #if !defined(LIBSA_SINGLE_DEVICE) 151 if (DEV_CLOSE(f->f_dev) != NULL) 152 #endif 153 (void)DEV_CLOSE(f->f_dev)(f); 154 } 155 err: 156 f->f_flags = 0; 157 errno = error; 158 return (-1); 159 } 160