1 /* $NetBSD: open.c,v 1.26 2007/11/24 13:20:56 isaki 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
oopen()70 oopen(){}
71 #endif
72
73 int
74 #ifndef __INTERNAL_LIBSA_CREAD
open(const char * fname,int mode)75 open(const char *fname, int mode)
76 #else
77 oopen(const char *fname, int mode)
78 #endif
79 {
80 struct open_file *f;
81 int fd, error;
82 #if !defined(LIBSA_SINGLE_FILESYSTEM)
83 int i, besterror;
84 #endif
85 char *file;
86
87 /* find a free file descriptor */
88 for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++)
89 if (f->f_flags == 0)
90 goto fnd;
91 errno = EMFILE;
92 return -1;
93 fnd:
94 /*
95 * Try to open the device.
96 * Convert open mode (0,1,2) to F_READ, F_WRITE.
97 */
98 f->f_flags = mode + 1;
99 #if !defined(LIBSA_SINGLE_DEVICE)
100 f->f_dev = (struct devsw *)0;
101 #endif
102 #if !defined(LIBSA_SINGLE_FILESYSTEM)
103 f->f_ops = (struct fs_ops *)0;
104 #endif
105 #if !defined(LIBSA_NO_RAW_ACCESS)
106 f->f_offset = 0;
107 #endif
108 file = (char *)0;
109 error = devopen(f, fname, &file);
110 if (error
111 #if !defined(LIBSA_SINGLE_DEVICE)
112 || (((f->f_flags & F_NODEV) == 0) &&
113 f->f_dev == (struct devsw *)0)
114 #endif
115 )
116 goto err;
117
118 #if !defined(LIBSA_NO_RAW_ACCESS)
119 /* see if we opened a raw device; otherwise, 'file' is the file name. */
120 if (file == (char *)0 || *file == '\0') {
121 f->f_flags |= F_RAW;
122 return fd;
123 }
124 #endif
125
126 /* pass file name to the different filesystem open routines */
127 #if !defined(LIBSA_SINGLE_FILESYSTEM)
128 besterror = ENOENT;
129 for (i = 0; i < nfsys; i++) {
130 error = FS_OPEN(&file_system[i])(file, f);
131 if (error == 0) {
132 f->f_ops = &file_system[i];
133 return fd;
134 }
135 if (error != EINVAL)
136 besterror = error;
137 }
138 error = besterror;
139 #else
140 error = FS_OPEN(&file_system[i])(file, f);
141 if (error == 0)
142 return fd;
143 if (error == EINVAL)
144 error = ENOENT;
145 #endif
146
147 if ((f->f_flags & F_NODEV) == 0) {
148 #if !defined(LIBSA_SINGLE_DEVICE)
149 if (DEV_CLOSE(f->f_dev) != NULL)
150 #endif
151 (void)DEV_CLOSE(f->f_dev)(f);
152 }
153 err:
154 f->f_flags = 0;
155 errno = error;
156 return -1;
157 }
158