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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: devname.c,v 1.5 2003/07/15 17:32:41 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 36 #include <db.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <paths.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <stdlib.h> 44 45 char * 46 devname(int dev, int t) 47 { 48 mode_t type = t; 49 struct { 50 mode_t type; 51 dev_t dev; 52 } bkey; 53 static DB *db; 54 static int failure; 55 DBT data, key; 56 57 if (!db && !failure && 58 !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) { 59 _warn("warning: %s", _PATH_DEVDB); 60 failure = 1; 61 } 62 if (failure) 63 return ("??"); 64 65 /* 66 * Keys are a mode_t followed by a dev_t. The former is the type of 67 * the file (mode & S_IFMT), the latter is the st_rdev field. Be 68 * sure to clear any padding that may be found in bkey. 69 */ 70 memset(&bkey, 0, sizeof(bkey)); 71 bkey.dev = dev; 72 bkey.type = type; 73 key.data = &bkey; 74 key.size = sizeof(bkey); 75 return ((db->get)(db, &key, &data, 0) ? "??" : (char *)data.data); 76 } 77