1/* $NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk 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 * 4. 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 <sys/cdefs.h> 64__FBSDID("$FreeBSD$"); 65 66#include "stand.h" 67 68struct open_file files[SOPEN_MAX]; 69 70static int 71o_gethandle(void) 72{ 73 int fd; 74 75 for (fd = 0; fd < SOPEN_MAX; fd++) 76 if (files[fd].f_flags == 0) 77 return(fd); 78 return(-1); 79} 80 81static void 82o_rainit(struct open_file *f) 83{ 84 f->f_rabuf = malloc(SOPEN_RASIZE); 85 f->f_ralen = 0; 86 f->f_raoffset = 0; 87} 88 89int 90open(const char *fname, int mode) 91{ 92 struct open_file *f; 93 int fd, i, error, besterror; 94 const char *file; 95 96 if ((fd = o_gethandle()) == -1) { 97 errno = EMFILE; 98 return(-1); 99 } 100 101 f = &files[fd]; 102 f->f_flags = mode + 1; 103 f->f_dev = (struct devsw *)0; 104 f->f_ops = (struct fs_ops *)0; 105 f->f_offset = 0; 106 f->f_devdata = NULL; 107 file = (char *)0; 108 error = devopen(f, fname, &file); 109 if (error || 110 (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0)) 111 goto err; 112 113 /* see if we opened a raw device; otherwise, 'file' is the file name. */ 114 if (file == (char *)0 || *file == '\0') { 115 f->f_flags |= F_RAW; 116 f->f_rabuf = NULL; 117 return (fd); 118 } 119 120 /* pass file name to the different filesystem open routines */ 121 besterror = ENOENT; 122 for (i = 0; file_system[i] != NULL; i++) { 123 124 error = ((*file_system[i]).fo_open)(file, f); 125 if (error == 0) { 126 127 f->f_ops = file_system[i]; 128 o_rainit(f); 129 return (fd); 130 } 131 if (error != EINVAL) 132 besterror = error; 133 } 134 error = besterror; 135 136 if ((f->f_flags & F_NODEV) == 0) 137 f->f_dev->dv_close(f); 138 if (error) 139 devclose(f); 140 141 err: 142 f->f_flags = 0; 143 errno = error; 144 return (-1); 145} 146