1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)devname.c 5.16 (Berkeley) 06/05/92"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <fcntl.h> 14 #include <errno.h> 15 #include <db.h> 16 #include <stdio.h> 17 #include <string.h> 18 #include <paths.h> 19 20 char * 21 devname(dev, type) 22 dev_t dev; 23 mode_t type; 24 { 25 struct { 26 mode_t type; 27 dev_t dev; 28 } bkey; 29 static DB *db; 30 static int failure; 31 DBT data, key; 32 33 if (!db && !failure && 34 !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) { 35 (void)fprintf(stderr, 36 "warning: %s: %s\n", _PATH_DEVDB, strerror(errno)); 37 failure = 1; 38 } 39 if (failure) 40 return("??"); 41 42 /* 43 * Keys are a mode_t followed by a dev_t. The former is the type of 44 * the file (mode & S_IFMT), the latter is the st_rdev field. 45 */ 46 bkey.dev = dev; 47 bkey.type = type; 48 key.data = &bkey; 49 key.size = sizeof(bkey); 50 return((db->get)(db, &key, &data, 0L) ? "??" : (char *)data.data); 51 } 52