devname.c revision 48882
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1989, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 341573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3523658Speterstatic char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; 361573Srgrimes#endif /* LIBC_SCCS and not lint */ 371573Srgrimes 381573Srgrimes#include <sys/types.h> 391573Srgrimes 401573Srgrimes#include <db.h> 411573Srgrimes#include <err.h> 421573Srgrimes#include <errno.h> 431573Srgrimes#include <fcntl.h> 441573Srgrimes#include <paths.h> 451573Srgrimes#include <stdio.h> 461573Srgrimes#include <string.h> 4748882Sphk#include <sys/stat.h> 481573Srgrimes 4948882Sphkstatic char * 5048882Sphkxdevname(dev, type) 511573Srgrimes dev_t dev; 521573Srgrimes mode_t type; 531573Srgrimes{ 541573Srgrimes struct { 551573Srgrimes mode_t type; 561573Srgrimes dev_t dev; 571573Srgrimes } bkey; 581573Srgrimes static DB *db; 591573Srgrimes static int failure; 601573Srgrimes DBT data, key; 611573Srgrimes 621573Srgrimes if (!db && !failure && 631573Srgrimes !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) { 641573Srgrimes warn("warning: %s", _PATH_DEVDB); 651573Srgrimes failure = 1; 661573Srgrimes } 671573Srgrimes if (failure) 6823658Speter return (NULL); 691573Srgrimes 701573Srgrimes /* 711573Srgrimes * Keys are a mode_t followed by a dev_t. The former is the type of 721573Srgrimes * the file (mode & S_IFMT), the latter is the st_rdev field. Be 731573Srgrimes * sure to clear any padding that may be found in bkey. 741573Srgrimes */ 751573Srgrimes memset(&bkey, 0, sizeof(bkey)); 761573Srgrimes bkey.dev = dev; 771573Srgrimes bkey.type = type; 781573Srgrimes key.data = &bkey; 791573Srgrimes key.size = sizeof(bkey); 8023658Speter return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data); 811573Srgrimes} 8248882Sphk 8348882Sphkchar * 8448882Sphkdevname(dev, type) 8548882Sphk dev_t dev; 8648882Sphk mode_t type; 8748882Sphk{ 8848882Sphk static char buf[20]; 8948882Sphk char *r; 9048882Sphk 9148882Sphk r = xdevname(dev, type); 9248882Sphk if (!r) { 9348882Sphk r = buf; 9448882Sphk if (minor(dev) > 255) { 9548882Sphk sprintf(buf, "#%c%d:0x%x", 9648882Sphk (type & S_IFMT) == S_IFCHR ? 'C' : 'B', 9748882Sphk major(dev), minor(dev)); 9848882Sphk } else { 9948882Sphk sprintf(buf, "#%c%d:%d", 10048882Sphk (type & S_IFMT) == S_IFCHR ? 'C' : 'B', 10148882Sphk major(dev), minor(dev)); 10248882Sphk } 10348882Sphk } 10448882Sphk return (r); 10548882Sphk} 106