devname.c revision 203290
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 * 4. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3123658Speterstatic char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3390039Sobrien#include <sys/cdefs.h> 3490039Sobrien__FBSDID("$FreeBSD: head/lib/libc/gen/devname.c 203290 2010-01-31 14:51:04Z ed $"); 351573Srgrimes 361573Srgrimes#include <sys/types.h> 3765632Sphk#include <sys/sysctl.h> 381573Srgrimes 391573Srgrimes#include <stdio.h> 401573Srgrimes#include <string.h> 4165955Sphk#include <sys/param.h> 4248882Sphk#include <sys/stat.h> 431573Srgrimes 4448882Sphkchar * 45116610Sphkdevname_r(dev_t dev, mode_t type, char *buf, int len) 4648882Sphk{ 4780552Stmm int i; 4880552Stmm size_t j; 4948882Sphk 50203290Sed if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(dev))) { 51203290Sed strlcpy(buf, "#NODEV", len); 52203290Sed return (buf); 53203290Sed } 54203290Sed 55203290Sed if (S_ISCHR(type)) { 56116610Sphk j = len; 5765632Sphk i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); 5865632Sphk if (i == 0) 59203290Sed return (buf); 6048882Sphk } 6165632Sphk 6265632Sphk /* Finally just format it */ 63203290Sed snprintf(buf, len, "#%c:%d:0x%x", 64203290Sed S_ISCHR(type) ? 'C' : 'B', major(dev), minor(dev)); 6565955Sphk return (buf); 6648882Sphk} 67116610Sphk 68116610Sphkchar * 69116610Sphkdevname(dev_t dev, mode_t type) 70116610Sphk{ 71116610Sphk static char buf[SPECNAMELEN + 1]; 72116610Sphk 73203290Sed return (devname_r(dev, type, buf, sizeof(buf))); 74116610Sphk} 75