/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include #include #include #include #include #include static char * xdevname(dev, type) dev_t dev; mode_t type; { struct { mode_t type; dev_t dev; } bkey; static DB *db; static int failure; DBT data, key; if (!db && !failure && !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) failure = 1; if (failure) return (NULL); /* * Keys are a mode_t followed by a dev_t. The former is the type of * the file (mode & S_IFMT), the latter is the st_rdev field. Be * sure to clear any padding that may be found in bkey. */ memset(&bkey, 0, sizeof(bkey)); bkey.dev = dev; bkey.type = type; key.data = &bkey; key.size = sizeof(bkey); return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data); } char * devname(dev, type) dev_t dev; mode_t type; { static char buf[SPECNAMELEN + 1]; int i; size_t j; char *r; /* First check the DB file. */ r = xdevname(dev, type); if (r != NULL) return (r); /* Then ask the kernel. */ if ((type & S_IFMT) == S_IFCHR) { j = sizeof(buf); i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); if (i == 0) return (buf); } /* Finally just format it */ if (minor(dev) > 255) r = "#%c:%d:0x%x"; else r = "#%c:%d:0x%d"; snprintf(buf, SPECNAMELEN + 1, r, (type & S_IFMT) == S_IFCHR ? 'C' : 'B', major(dev), minor(dev)); return (buf); }