projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4d554349 NW |
1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. | |
| 3 | * 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. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 32 | */ | |
| 33 | ||
| 34 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 35 | static char sccsid[] = "@(#)devname.c 5.14 (Berkeley) 5/6/91"; | |
| 36 | #endif /* LIBC_SCCS and not lint */ | |
| 37 | ||
| 38 | #include <sys/types.h> | |
| 39 | #include <fcntl.h> | |
| 40 | #include <db.h> | |
| 41 | #include <stdio.h> | |
| 42 | #include <paths.h> | |
| 43 | ||
| 44 | char * | |
| 45 | devname(dev, type) | |
| 46 | dev_t dev; | |
| 47 | mode_t type; | |
| 48 | { | |
| 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 | (void)fprintf(stderr, | |
| 60 | "warning: no device database %s\n", _PATH_DEVDB); | |
| 61 | failure = 1; | |
| 62 | } | |
| 63 | if (failure) | |
| 64 | return("??"); | |
| 65 | ||
| 66 | /* | |
| 67 | * Keys are a mode_t followed by a dev_t. The former is the type of | |
| 68 | * the file (mode & S_IFMT), the latter is the st_rdev field. | |
| 69 | */ | |
| 70 | bkey.dev = dev; | |
| 71 | bkey.type = type; | |
| 72 | key.data = &bkey; | |
| 73 | key.size = sizeof(bkey); | |
| 74 | return((db->get)(db, &key, &data, 0L) ? "??" : (char *)data.data); | |
| 75 | } |