devopen.c revision 1.1 
1/*	$NetBSD: devopen.c,v 1.1 2006/04/07 14:21:29 cherry Exp $	*/
2
3/*-
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30
31#include <lib/libsa/stand.h>
32
33#include "bootstrap.h"
34
35int
36devopen(struct open_file *f, const char *fname, char **file)
37{
38    struct devdesc	*dev;
39    int			result;
40
41    if ((result = archsw.arch_getdev((void *)&dev, fname, (const char **) file)) == 0) {	/* get the device */
42	/* point to device-specific data so that device open can use it */
43	f->f_devdata = dev;
44	if ((result = dev->d_dev->dv_open(f, dev)) == 0) { 		/* try to open it */
45	    /* reference the devsw entry from the open_file structure */
46	    f->f_dev = dev->d_dev;
47	} else {
48	    free(dev);		/* release the device descriptor */
49	}
50    }
51    return(result);
52}
53
54int
55devclose(struct open_file *f)
56{
57    if (f->f_devdata != NULL) {
58	free(f->f_devdata);
59    }
60    return(0);
61}
62