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 5.14 (Berkeley) 05/06/91"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <fcntl.h> 14 #include <db.h> 15 #include <stdio.h> 16 #include <paths.h> 17 18 char * 19 devname(dev, type) 20 dev_t dev; 21 mode_t type; 22 { 23 struct { 24 mode_t type; 25 dev_t dev; 26 } bkey; 27 static DB *db; 28 static int failure; 29 DBT data, key; 30 31 if (!db && !failure && 32 !(db = hash_open(_PATH_DEVDB, O_RDONLY, 0, NULL))) { 33 (void)fprintf(stderr, 34 "warning: no device database %s\n", _PATH_DEVDB); 35 failure = 1; 36 } 37 if (failure) 38 return("??"); 39 40 /* 41 * Keys are a mode_t followed by a dev_t. The former is the type of 42 * the file (mode & S_IFMT), the latter is the st_rdev field. 43 */ 44 bkey.dev = dev; 45 bkey.type = type; 46 key.data = &bkey; 47 key.size = sizeof(bkey); 48 return((db->get)(db, &key, &data, 0L) ? "??" : (char *)data.data); 49 } 50