devname.c revision 287332
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 287332 2015-08-31 19:40:54Z rodrigc $"); 351573Srgrimes 361573Srgrimes#include <sys/types.h> 3765632Sphk#include <sys/sysctl.h> 381573Srgrimes 391573Srgrimes#include <stdio.h> 40225847Sed#include <stdint.h> 41287332Srodrigc#include <stdlib.h> 421573Srgrimes#include <string.h> 4365955Sphk#include <sys/param.h> 4448882Sphk#include <sys/stat.h> 451573Srgrimes 4648882Sphkchar * 47116610Sphkdevname_r(dev_t dev, mode_t type, char *buf, int len) 4848882Sphk{ 4980552Stmm int i; 5080552Stmm size_t j; 5148882Sphk 52203290Sed if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(dev))) { 53203290Sed strlcpy(buf, "#NODEV", len); 54203290Sed return (buf); 55203290Sed } 56203290Sed 57203290Sed if (S_ISCHR(type)) { 58116610Sphk j = len; 5965632Sphk i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); 6065632Sphk if (i == 0) 61203290Sed return (buf); 6248882Sphk } 6365632Sphk 6465632Sphk /* Finally just format it */ 65225847Sed snprintf(buf, len, "#%c:%#jx", 66225847Sed S_ISCHR(type) ? 'C' : 'B', (uintmax_t)dev); 6765955Sphk return (buf); 6848882Sphk} 69116610Sphk 70116610Sphkchar * 71116610Sphkdevname(dev_t dev, mode_t type) 72116610Sphk{ 73116610Sphk static char buf[SPECNAMELEN + 1]; 74116610Sphk 75203290Sed return (devname_r(dev, type, buf, sizeof(buf))); 76116610Sphk} 77