1/* $NetBSD: getdevmajor.c,v 1.7 2024/01/20 14:52:47 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Brown. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#if defined(LIBC_SCCS) && !defined(lint) 37__RCSID("$NetBSD: getdevmajor.c,v 1.7 2024/01/20 14:52:47 christos Exp $"); 38#endif /* LIBC_SCCS and not lint */ 39 40#include "namespace.h" 41#include <sys/types.h> 42#include <sys/stat.h> 43#include <sys/param.h> 44#include <sys/sysctl.h> 45 46#include <errno.h> 47#include <string.h> 48#include <stdlib.h> 49#include "getdevmajor_private.h" 50 51#ifdef __weak_alias 52__weak_alias(getdevmajor,_getdevmajor) 53#endif 54 55/* 56 * XXX temporary alias because getdevmajor() was renamed 57 * in -current for some time 58 */ 59dev_t 60__getdevmajor50(const char *name, mode_t type) 61{ 62 63 return (dev_t)getdevmajor(name, type); 64} 65 66devmajor_t 67getdevmajor(const char *name, mode_t type) 68{ 69 struct kinfo_drivers kd[200], *kdp = &kd[0]; 70 size_t i, sz = sizeof(kd); 71 int rc; 72 devmajor_t n = NODEVMAJOR; 73 74 if (type != S_IFCHR && type != S_IFBLK) { 75 errno = EINVAL; 76 return n; 77 } 78 79 do { 80 rc = sysctlbyname("kern.drivers", kdp, &sz, NULL, 0); 81 if (rc == -1) { 82 if (errno != ENOMEM) 83 goto out; 84 if (kdp != &kd[0]) 85 free(kdp); 86 if ((kdp = malloc(sz)) == NULL) 87 return n; 88 } 89 } while (rc == -1); 90 91 sz /= sizeof(*kdp); 92 93 for (i = 0; i < sz; i++) { 94 if (strcmp(name, kdp[i].d_name) == 0) { 95 if (type == S_IFCHR) 96 n = kdp[i].d_cmajor; 97 else 98 n = kdp[i].d_bmajor; 99 break; 100 } 101 } 102 if (i >= sz) 103 errno = ENOENT; 104 105 out: 106 if (kdp != &kd[0]) 107 free(kdp); 108 109 return n; 110} 111