devopen.c revision 39673 
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 *	$Id: devopen.c,v 1.1.1.1 1998/08/21 03:17:41 msmith Exp $
27 */
28
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    if ((result = archsw.arch_getdev((void *)&dev, fname, 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