2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/lib/libc/gen/devname.c,v 1.2.2.2 2001/07/31 20:10:19 tmm Exp $
34 * $DragonFly: src/lib/libcr/gen/Attic/devname.c,v 1.2 2003/06/17 04:26:42 dillon Exp $
36 * @(#)devname.c 8.2 (Berkeley) 4/29/95
39 #include <sys/types.h>
40 #include <sys/sysctl.h>
64 if (!db && !failure &&
65 !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) {
66 warn("warning: %s", _PATH_DEVDB);
73 * Keys are a mode_t followed by a dev_t. The former is the type of
74 * the file (mode & S_IFMT), the latter is the st_rdev field. Be
75 * sure to clear any padding that may be found in bkey.
77 memset(&bkey, 0, sizeof(bkey));
81 key.size = sizeof(bkey);
82 return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data);
90 static char buf[30]; /* XXX: pick up from <sys/conf.h> */
95 /* First check the DB file. */
96 r = xdevname(dev, type);
100 /* Then ask the kernel. */
101 if ((type & S_IFMT) == S_IFCHR) {
103 i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
108 /* Finally just format it */
110 if (minor(dev) > 255) {
111 sprintf(buf, "#%c%d:0x%x",
112 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
113 major(dev), minor(dev));
115 sprintf(buf, "#%c%d:%d",
116 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
117 major(dev), minor(dev));