1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)devname.c 8.2 (Berkeley) 4/29/95"); 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/sysctl.h> 38 39 #include <stdio.h> 40 #include <stdint.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <sys/stat.h> 44 45 char * 46 devname_r(dev_t dev, mode_t type, char *buf, int len) 47 { 48 int i; 49 size_t j; 50 51 if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(type))) { 52 strlcpy(buf, "#NODEV", len); 53 return (buf); 54 } 55 56 if (S_ISCHR(type)) { 57 j = len; 58 i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev)); 59 if (i == 0) 60 return (buf); 61 } 62 63 /* Finally just format it */ 64 snprintf(buf, len, "#%c:%#jx", 65 S_ISCHR(type) ? 'C' : 'B', (uintmax_t)dev); 66 return (buf); 67 } 68 69 char * 70 devname(dev_t dev, mode_t type) 71 { 72 static char buf[SPECNAMELEN + 1]; 73 74 return (devname_r(dev, type, buf, sizeof(buf))); 75 } 76