| 1 | /* $FreeBSD: src/lib/libstand/open.c,v 1.2.6.1 2000/09/10 01:32:06 ps Exp $ */ |
| 2 | /* $DragonFly: src/lib/libstand/open.c,v 1.2 2003/06/17 04:26:51 dillon Exp $ */ |
| 3 | /* $NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk Exp $ */ |
| 4 | |
| 5 | /*- |
| 6 | * Copyright (c) 1993 |
| 7 | * The Regents of the University of California. All rights reserved. |
| 8 | * |
| 9 | * This code is derived from software contributed to Berkeley by |
| 10 | * The Mach Operating System project at Carnegie-Mellon University. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * 3. All advertising materials mentioning features or use of this software |
| 21 | * must display the following acknowledgement: |
| 22 | * This product includes software developed by the University of |
| 23 | * California, Berkeley and its contributors. |
| 24 | * 4. Neither the name of the University nor the names of its contributors |
| 25 | * may be used to endorse or promote products derived from this software |
| 26 | * without specific prior written permission. |
| 27 | * |
| 28 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 38 | * SUCH DAMAGE. |
| 39 | * |
| 40 | * @(#)open.c 8.1 (Berkeley) 6/11/93 |
| 41 | * |
| 42 | * |
| 43 | * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University |
| 44 | * All Rights Reserved. |
| 45 | * |
| 46 | * Author: Alessandro Forin |
| 47 | * |
| 48 | * Permission to use, copy, modify and distribute this software and its |
| 49 | * documentation is hereby granted, provided that both the copyright |
| 50 | * notice and this permission notice appear in all copies of the |
| 51 | * software, derivative works or modified versions, and any portions |
| 52 | * thereof, and that both notices appear in supporting documentation. |
| 53 | * |
| 54 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| 55 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| 56 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 57 | * |
| 58 | * Carnegie Mellon requests users of this software to return to |
| 59 | * |
| 60 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 61 | * School of Computer Science |
| 62 | * Carnegie Mellon University |
| 63 | * Pittsburgh PA 15213-3890 |
| 64 | * |
| 65 | * any improvements or extensions that they make and grant Carnegie the |
| 66 | * rights to redistribute these changes. |
| 67 | */ |
| 68 | |
| 69 | #include "stand.h" |
| 70 | |
| 71 | struct open_file files[SOPEN_MAX]; |
| 72 | |
| 73 | static int |
| 74 | o_gethandle(void) |
| 75 | { |
| 76 | int fd; |
| 77 | |
| 78 | for (fd = 0; fd < SOPEN_MAX; fd++) |
| 79 | if (files[fd].f_flags == 0) |
| 80 | return(fd); |
| 81 | return(-1); |
| 82 | } |
| 83 | |
| 84 | static void |
| 85 | o_rainit(struct open_file *f) |
| 86 | { |
| 87 | f->f_rabuf = malloc(SOPEN_RASIZE); |
| 88 | f->f_ralen = 0; |
| 89 | f->f_raoffset = 0; |
| 90 | } |
| 91 | |
| 92 | int |
| 93 | open(const char *fname, int mode) |
| 94 | { |
| 95 | struct open_file *f; |
| 96 | int fd, i, error, besterror; |
| 97 | const char *file; |
| 98 | |
| 99 | if ((fd = o_gethandle()) == -1) { |
| 100 | errno = EMFILE; |
| 101 | return(-1); |
| 102 | } |
| 103 | |
| 104 | f = &files[fd]; |
| 105 | f->f_flags = mode + 1; |
| 106 | f->f_dev = (struct devsw *)0; |
| 107 | f->f_ops = (struct fs_ops *)0; |
| 108 | f->f_offset = 0; |
| 109 | f->f_devdata = NULL; |
| 110 | f->f_fsdata = NULL; |
| 111 | file = NULL; |
| 112 | error = devopen(f, fname, &file); |
| 113 | if (error || |
| 114 | (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0)) |
| 115 | goto err; |
| 116 | |
| 117 | /* see if we opened a raw device; otherwise, 'file' is the file name. */ |
| 118 | if (file == NULL || *file == '\0') { |
| 119 | f->f_flags |= F_RAW; |
| 120 | return (fd); |
| 121 | } |
| 122 | |
| 123 | /* pass file name to the different filesystem open routines */ |
| 124 | besterror = ENOENT; |
| 125 | for (i = 0; file_system[i] != NULL; i++) { |
| 126 | error = ((*file_system[i]).fo_open)(file, f); |
| 127 | if (error == 0) { |
| 128 | f->f_ops = file_system[i]; |
| 129 | o_rainit(f); |
| 130 | return (fd); |
| 131 | } |
| 132 | if (error != EINVAL) |
| 133 | besterror = error; |
| 134 | } |
| 135 | error = besterror; |
| 136 | |
| 137 | if ((f->f_flags & F_NODEV) == 0) |
| 138 | f->f_dev->dv_close(f); |
| 139 | if (error) |
| 140 | devclose(f); |
| 141 | |
| 142 | err: |
| 143 | f->f_flags = 0; |
| 144 | errno = error; |
| 145 | return (-1); |
| 146 | } |