1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include "synonyms.h" 34 #include <sys/types.h> 35 #include <sys/mkdev.h> 36 #include <errno.h> 37 38 /* 39 * Create a formatted device number 40 */ 41 dev_t 42 __makedev(const int version, const major_t majdev, const minor_t mindev) 43 { 44 dev_t devnum; 45 switch (version) { 46 case OLDDEV: 47 if (majdev > OMAXMAJ || mindev > OMAXMIN) { 48 errno = EINVAL; 49 return ((o_dev_t)NODEV); 50 } 51 devnum = ((majdev << ONBITSMINOR) | mindev); 52 break; 53 54 case NEWDEV: 55 #if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */ 56 if (majdev > MAXMAJ) { 57 errno = EINVAL; 58 return (NODEV); 59 } 60 #endif 61 #if MAXMIN != 0xfffffffful /* assumes minor_t == uint32_t */ 62 if (mindev > MAXMIN) { 63 errno = EINVAL; 64 return (NODEV); 65 } 66 #endif 67 if ((devnum = (((dev_t)majdev << NBITSMINOR) | 68 mindev)) == NODEV) { 69 errno = EINVAL; 70 return (NODEV); 71 } 72 break; 73 74 default: 75 errno = EINVAL; 76 return (NODEV); 77 } 78 79 return (devnum); 80 } 81 82 /* 83 * Return major number part of formatted device number 84 */ 85 major_t 86 __major(const int version, const dev_t devnum) 87 { 88 major_t maj; 89 90 switch (version) { 91 case OLDDEV: 92 maj = (devnum >> ONBITSMINOR); 93 if (devnum == NODEV || maj > OMAXMAJ) { 94 errno = EINVAL; 95 return ((major_t)NODEV); 96 } 97 break; 98 99 case NEWDEV: 100 maj = (devnum >> NBITSMINOR); 101 if (devnum == NODEV) { 102 errno = EINVAL; 103 return ((major_t)NODEV); 104 } 105 #if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */ 106 if (maj > MAXMAJ) { 107 errno = EINVAL; 108 return ((major_t)NODEV); 109 } 110 #endif 111 break; 112 113 default: 114 errno = EINVAL; 115 return ((major_t)NODEV); 116 } 117 118 return (maj); 119 } 120 121 122 /* 123 * Return minor number part of formatted device number 124 */ 125 minor_t 126 __minor(const int version, const dev_t devnum) 127 { 128 switch (version) { 129 case OLDDEV: 130 if (devnum == NODEV) { 131 errno = EINVAL; 132 return ((minor_t)NODEV); 133 } 134 return (devnum & OMAXMIN); 135 136 case NEWDEV: 137 if (devnum == NODEV) { 138 errno = EINVAL; 139 return ((minor_t)NODEV); 140 } 141 return (devnum & MAXMIN); 142 143 default: 144 errno = EINVAL; 145 return ((minor_t)NODEV); 146 } 147 } 148