devopen.c revision 163891 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/common/devopen.c 163891 2006-11-02 00:02:22Z marcel $");
29
30#include <stand.h>
31#include <string.h>
32
33#include "bootstrap.h"
34
35int
36devopen(struct open_file *f, const char *fname, const char **file)
37{
38    struct devdesc *dev;
39    int result;
40
41    result = archsw.arch_getdev((void **)&dev, fname, file);
42    if (result)
43	return (result);
44
45    /* point to device-specific data so that device open can use it */
46    f->f_devdata = dev;
47    result = dev->d_dev->dv_open(f, dev);
48    if (result != 0) {
49	f->f_devdata = NULL;
50	free(dev);
51	return (result);
52    }
53
54    /* reference the devsw entry from the open_file structure */
55    f->f_dev = dev->d_dev;
56    return (0);
57}
58
59int
60devclose(struct open_file *f)
61{
62    if (f->f_devdata != NULL) {
63	free(f->f_devdata);
64    }
65    return(0);
66}
67