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
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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33 * $FreeBSD: src/lib/libc/gen/devname.c,v 1.2.2.2 2001/07/31 20:10:19 tmm Exp $
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95";
38 #endif /* LIBC_SCCS and not lint */
40 #include <sys/types.h>
41 #include <sys/sysctl.h>
65 if (!db && !failure &&
66 !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) {
67 warn("warning: %s", _PATH_DEVDB);
74 * Keys are a mode_t followed by a dev_t. The former is the type of
75 * the file (mode & S_IFMT), the latter is the st_rdev field. Be
76 * sure to clear any padding that may be found in bkey.
78 memset(&bkey, 0, sizeof(bkey));
82 key.size = sizeof(bkey);
83 return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data);
91 static char buf[30]; /* XXX: pick up from <sys/conf.h> */
96 /* First check the DB file. */
97 r = xdevname(dev, type);
101 /* Then ask the kernel. */
102 if ((type & S_IFMT) == S_IFCHR) {
104 i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
109 /* Finally just format it */
111 if (minor(dev) > 255) {
112 sprintf(buf, "#%c%d:0x%x",
113 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
114 major(dev), minor(dev));
116 sprintf(buf, "#%c%d:%d",
117 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
118 major(dev), minor(dev));