1 /* $OpenBSD: open.c,v 1.11 2016/03/14 23:08:06 krw Exp $ */ 2 /* $NetBSD: open.c,v 1.12 1996/09/30 16:01:21 ws Exp $ */ 3 4 /*- 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * The Mach Operating System project at Carnegie-Mellon University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)open.c 8.1 (Berkeley) 6/11/93 36 * 37 * 38 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 39 * All Rights Reserved. 40 * 41 * Author: Alessandro Forin 42 * 43 * Permission to use, copy, modify and distribute this software and its 44 * documentation is hereby granted, provided that both the copyright 45 * notice and this permission notice appear in all copies of the 46 * software, derivative works or modified versions, and any portions 47 * thereof, and that both notices appear in supporting documentation. 48 * 49 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 51 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 * 53 * Carnegie Mellon requests users of this software to return to 54 * 55 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 56 * School of Computer Science 57 * Carnegie Mellon University 58 * Pittsburgh PA 15213-3890 59 * 60 * any improvements or extensions that they make and grant Carnegie the 61 * rights to redistribute these changes. 62 */ 63 64 #include "stand.h" 65 66 struct open_file files[SOPEN_MAX]; 67 68 /* 69 * File primitives proper 70 */ 71 72 int 73 #ifndef __INTERNAL_LIBSA_CREAD 74 open(const char *fname, int mode) 75 #else 76 oopen(const char *fname, int mode) 77 #endif 78 { 79 struct open_file *f; 80 int fd, i, error; 81 char *file; 82 83 /* find a free file descriptor */ 84 for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++) 85 if (f->f_flags == 0) 86 goto fnd; 87 errno = EMFILE; 88 return (-1); 89 fnd: 90 /* 91 * Try to open the device. 92 * Convert open mode (0,1,2) to F_READ, F_WRITE. 93 */ 94 f->f_flags = mode + 1; 95 f->f_dev = NULL; 96 f->f_ops = NULL; 97 file = NULL; 98 error = devopen(f, fname, &file); 99 if (error || 100 (((f->f_flags & F_NODEV) == 0) && f->f_dev == NULL)) 101 goto err; 102 103 /* see if we opened a raw device; otherwise, 'file' is the file name. */ 104 if (file == NULL || *file == '\0') { 105 f->f_flags |= F_RAW; 106 return (fd); 107 } 108 109 /* pass file name to the different filesystem open routines */ 110 for (i = 0; i < nfsys; i++) { 111 /* convert mode (0,1,2) to FREAD, FWRITE. */ 112 error = (file_system[i].open)(file, f); 113 if (error == 0) { 114 f->f_ops = &file_system[i]; 115 return (fd); 116 } 117 if (error == ENOENT || error == ENOTDIR) 118 break; 119 } 120 if (!error) 121 error = ENOENT; 122 123 f->f_dev->dv_close(f); 124 err: 125 f->f_flags = 0; 126 errno = error; 127 return (-1); 128 } 129