1 /* $NetBSD: getdevmajor.c,v 1.3 2004/12/16 04:37:25 atatat 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 1.3 2004/12/16 04:37:25 atatat 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 50 #ifdef __weak_alias 51 __weak_alias(getdevmajor,_getdevmajor) 52 #endif 53 54 dev_t 55 getdevmajor(const char *name, mode_t type) 56 { 57 struct kinfo_drivers kd[200], *kdp = &kd[0]; 58 int rc, i; 59 size_t sz = sizeof(kd); 60 dev_t n = (dev_t)~0; 61 62 if (type != S_IFCHR && type != S_IFBLK) { 63 errno = EINVAL; 64 return n; 65 } 66 67 do { 68 rc = sysctlbyname("kern.drivers", kdp, &sz, NULL, 0); 69 if (rc == -1) { 70 if (errno != ENOMEM) 71 goto out; 72 if (kdp != &kd[0]) 73 free(kdp); 74 if ((kdp = malloc(sz)) == NULL) 75 return n; 76 } 77 } while (rc == -1); 78 79 rc = sz / sizeof(*kdp); 80 81 for (i = 0; i < rc; i++) { 82 if (strcmp(name, kdp[i].d_name) == 0) { 83 if (type == S_IFCHR) 84 n = kdp[i].d_cmajor; 85 else 86 n = kdp[i].d_bmajor; 87 break; 88 } 89 } 90 if (i >= rc) 91 errno = ENOENT; 92 93 out: 94 if (kdp != &kd[0]) 95 free(kdp); 96 97 return n; 98 } 99