devname.c revision 203290
1168404Spjd/* 2168404Spjd * Copyright (c) 1989, 1993 3168404Spjd * The Regents of the University of California. All rights reserved. 4168404Spjd * 5168404Spjd * Redistribution and use in source and binary forms, with or without 6168404Spjd * modification, are permitted provided that the following conditions 7168404Spjd * are met: 8168404Spjd * 1. Redistributions of source code must retain the above copyright 9168404Spjd * notice, this list of conditions and the following disclaimer. 10168404Spjd * 2. Redistributions in binary form must reproduce the above copyright 11168404Spjd * notice, this list of conditions and the following disclaimer in the 12168404Spjd * documentation and/or other materials provided with the distribution. 13168404Spjd * 4. Neither the name of the University nor the names of its contributors 14168404Spjd * may be used to endorse or promote products derived from this software 15168404Spjd * without specific prior written permission. 16168404Spjd * 17168404Spjd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18168404Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19168404Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20168404Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21168404Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22209962Smm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23168404Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24168404Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25168404Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26168404Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27168404Spjd * SUCH DAMAGE. 28185029Spjd */ 29168404Spjd 30168404Spjd#if defined(LIBC_SCCS) && !defined(lint) 31168404Spjdstatic char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95"; 32168404Spjd#endif /* LIBC_SCCS and not lint */ 33168404Spjd#include <sys/cdefs.h> 34185029Spjd__FBSDID("$FreeBSD: head/lib/libc/gen/devname.c 203290 2010-01-31 14:51:04Z ed $"); 35168404Spjd 36168404Spjd#include <sys/types.h> 37168404Spjd#include <sys/sysctl.h> 38168404Spjd 39168404Spjd#include <stdio.h> 40168404Spjd#include <string.h> 41168404Spjd#include <sys/param.h> 42168404Spjd#include <sys/stat.h> 43168404Spjd 44168404Spjdchar * 45168404Spjddevname_r(dev_t dev, mode_t type, char *buf, int len) 46168404Spjd{ 47168404Spjd int i; 48168404Spjd size_t j; 49168404Spjd 50209962Smm if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(dev))) { 51168404Spjd strlcpy(buf, "#NODEV", len); 52168404Spjd return (buf); 53168404Spjd } 54185029Spjd 55185029Spjd if (S_ISCHR(type)) { 56168404Spjd j = len; 57168404Spjd i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); 58168404Spjd if (i == 0) 59168404Spjd return (buf); 60168404Spjd } 61168404Spjd 62168404Spjd /* Finally just format it */ 63168404Spjd snprintf(buf, len, "#%c:%d:0x%x", 64168404Spjd S_ISCHR(type) ? 'C' : 'B', major(dev), minor(dev)); 65168404Spjd return (buf); 66168404Spjd} 67168404Spjd 68168404Spjdchar * 69168404Spjddevname(dev_t dev, mode_t type) 70168404Spjd{ 71168404Spjd static char buf[SPECNAMELEN + 1]; 72168404Spjd 73168404Spjd return (devname_r(dev, type, buf, sizeof(buf))); 74168404Spjd} 75168404Spjd