devname.c revision 65632
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. 3265632Sphk * 3365632Sphk * $FreeBSD: head/lib/libc/gen/devname.c 65632 2000-09-09 11:39:59Z phk $ 341573Srgrimes */ 351573Srgrimes 361573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3723658Speterstatic char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; 381573Srgrimes#endif /* LIBC_SCCS and not lint */ 391573Srgrimes 401573Srgrimes#include <sys/types.h> 4165632Sphk#include <sys/sysctl.h> 421573Srgrimes 431573Srgrimes#include <db.h> 441573Srgrimes#include <err.h> 451573Srgrimes#include <errno.h> 461573Srgrimes#include <fcntl.h> 471573Srgrimes#include <paths.h> 481573Srgrimes#include <stdio.h> 491573Srgrimes#include <string.h> 5048882Sphk#include <sys/stat.h> 511573Srgrimes 5248882Sphkstatic char * 5348882Sphkxdevname(dev, type) 541573Srgrimes dev_t dev; 551573Srgrimes mode_t type; 561573Srgrimes{ 571573Srgrimes struct { 581573Srgrimes mode_t type; 591573Srgrimes dev_t dev; 601573Srgrimes } bkey; 611573Srgrimes static DB *db; 621573Srgrimes static int failure; 631573Srgrimes DBT data, key; 641573Srgrimes 651573Srgrimes if (!db && !failure && 661573Srgrimes !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) { 671573Srgrimes warn("warning: %s", _PATH_DEVDB); 681573Srgrimes failure = 1; 691573Srgrimes } 701573Srgrimes if (failure) 7123658Speter return (NULL); 721573Srgrimes 731573Srgrimes /* 741573Srgrimes * Keys are a mode_t followed by a dev_t. The former is the type of 751573Srgrimes * the file (mode & S_IFMT), the latter is the st_rdev field. Be 761573Srgrimes * sure to clear any padding that may be found in bkey. 771573Srgrimes */ 781573Srgrimes memset(&bkey, 0, sizeof(bkey)); 791573Srgrimes bkey.dev = dev; 801573Srgrimes bkey.type = type; 811573Srgrimes key.data = &bkey; 821573Srgrimes key.size = sizeof(bkey); 8323658Speter return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data); 841573Srgrimes} 8548882Sphk 8648882Sphkchar * 8748882Sphkdevname(dev, type) 8848882Sphk dev_t dev; 8948882Sphk mode_t type; 9048882Sphk{ 9165632Sphk static char buf[30]; /* XXX: pick up from <sys/conf.h> */ 9265632Sphk int i, j; 9348882Sphk char *r; 9448882Sphk 9565632Sphk /* First check the DB file. */ 9648882Sphk r = xdevname(dev, type); 9765632Sphk if (r != NULL) 9865632Sphk return (r); 9965632Sphk 10065632Sphk /* Then ask the kernel. */ 10165632Sphk if ((type & S_IFMT) == S_IFCHR) { 10265632Sphk j = sizeof(buf); 10365632Sphk i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); 10465632Sphk if (i == 0) 10565632Sphk return (buf); 10648882Sphk } 10765632Sphk 10865632Sphk /* Finally just format it */ 10965632Sphk r = buf; 11065632Sphk if (minor(dev) > 255) { 11165632Sphk sprintf(buf, "#%c%d:0x%x", 11265632Sphk (type & S_IFMT) == S_IFCHR ? 'C' : 'B', 11365632Sphk major(dev), minor(dev)); 11465632Sphk } else { 11565632Sphk sprintf(buf, "#%c%d:%d", 11665632Sphk (type & S_IFMT) == S_IFCHR ? 'C' : 'B', 11765632Sphk major(dev), minor(dev)); 11865632Sphk } 11948882Sphk return (r); 12048882Sphk} 121