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15 * This product includes software developed by the University of
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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 $
34 * $DragonFly: src/lib/libc/gen/devname.c,v 1.6 2005/04/26 16:59:56 joerg Exp $
36 * @(#)devname.c 8.2 (Berkeley) 4/29/95
39 #include <sys/types.h>
41 #include <sys/sysctl.h>
51 #define DEVNAME_DEVFS_COMPAT 1
53 #ifdef DEVNAME_DEVFS_COMPAT
55 xdevname(dev_t dev, mode_t type)
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);
88 devname_r(dev_t dev, mode_t type, char *buf, size_t len)
93 if (sysctlbyname("kern.devname", buf, &n, &dev, sizeof(dev)) == 0)
96 #ifdef DEVNAME_DEVFS_COMPAT
97 /* Fall back to old method if compat for devfs is set */
98 /* First check the DB file. */
99 r = xdevname(dev, type);
101 strlcpy(buf, r, len);
106 /* Finally just format it */
107 snprintf(buf, len, "#%c%d:0x%x",
108 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
109 major(dev), minor(dev));
115 devname(dev_t dev, mode_t type)
117 static char buf[30]; /* XXX: pick up from <sys/conf.h> */
119 strlcpy(buf, devname_r(dev, type, buf, sizeof(buf)), sizeof(buf));