1 /* $OpenBSD: open.c,v 1.7 1998/09/11 01:41:18 millert 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)open.c 8.1 (Berkeley) 6/11/93 40 * 41 * 42 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 43 * All Rights Reserved. 44 * 45 * Author: Alessandro Forin 46 * 47 * Permission to use, copy, modify and distribute this software and its 48 * documentation is hereby granted, provided that both the copyright 49 * notice and this permission notice appear in all copies of the 50 * software, derivative works or modified versions, and any portions 51 * thereof, and that both notices appear in supporting documentation. 52 * 53 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 54 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 55 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 56 * 57 * Carnegie Mellon requests users of this software to return to 58 * 59 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 60 * School of Computer Science 61 * Carnegie Mellon University 62 * Pittsburgh PA 15213-3890 63 * 64 * any improvements or extensions that they make and grant Carnegie the 65 * rights to redistribute these changes. 66 */ 67 68 #include "stand.h" 69 70 struct open_file files[SOPEN_MAX]; 71 72 /* 73 * File primitives proper 74 */ 75 76 int 77 #ifndef __INTERNAL_LIBSA_CREAD 78 open(fname, mode) 79 #else 80 oopen(fname, mode) 81 #endif 82 const char *fname; 83 int mode; 84 { 85 register struct open_file *f; 86 register int fd, i, error; 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 f->f_dev = (struct devsw *)0; 102 f->f_ops = (struct fs_ops *)0; 103 file = (char *)0; 104 error = devopen(f, fname, &file); 105 if (error || 106 (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0)) 107 goto err; 108 109 /* see if we opened a raw device; otherwise, 'file' is the file name. */ 110 if (file == (char *)0 || *file == '\0') { 111 f->f_flags |= F_RAW; 112 return (fd); 113 } 114 115 /* pass file name to the different filesystem open routines */ 116 for (i = 0; i < nfsys; i++) { 117 /* convert mode (0,1,2) to FREAD, FWRITE. */ 118 error = (file_system[i].open)(file, f); 119 if (error == 0) { 120 f->f_ops = &file_system[i]; 121 return (fd); 122 } 123 if (error == ENOENT || error == ENOTDIR) 124 break; 125 } 126 if (!error) 127 error = ENOENT; 128 129 f->f_dev->dv_close(f); 130 err: 131 f->f_flags = 0; 132 errno = error; 133 return (-1); 134 } 135