1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: src/lib/libc/gen/devname.c,v 1.2.2.2 2001/07/31 20:10:19 tmm Exp $
30 *
31 * @(#)devname.c 8.2 (Berkeley) 4/29/95
32 */
33
34 #include "namespace.h"
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <sys/param.h>
38 #include <sys/sysctl.h>
39
40 #include <err.h>
41 #include <fcntl.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include "un-namespace.h"
46
47 char *
devname_r(dev_t dev,mode_t type,char * buf,size_t len)48 devname_r(dev_t dev, mode_t type, char *buf, size_t len)
49 {
50 size_t n = len;
51
52 if (sysctlbyname("kern.devname", buf, &n, &dev, sizeof(dev)) == 0)
53 return buf;
54
55 /* Just format it if failed to get its name */
56 snprintf(buf, len, "#%c%d:0x%x",
57 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
58 major(dev), minor(dev));
59
60 return (buf);
61 }
62
63 char *
devname(dev_t dev,mode_t type)64 devname(dev_t dev, mode_t type)
65 {
66 static char buf[MAXPATHLEN];
67
68 strlcpy(buf, devname_r(dev, type, buf, sizeof(buf)), sizeof(buf));
69
70 return (buf);
71 }
72