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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * Copyright (c) 2015, Joyent, Inc. 26 */ 27 28 /* 29 * The copyright in this file is taken from the original Leach 30 * & Salz UUID specification, from which this implementation 31 * is derived. 32 */ 33 34 /* 35 * Copyright (c) 1990- 1993, 1996 Open Software Foundation, Inc. 36 * Copyright (c) 1989 by Hewlett-Packard Company, Palo Alto, Ca. & 37 * Digital Equipment Corporation, Maynard, Mass. Copyright (c) 1998 38 * Microsoft. To anyone who acknowledges that this file is provided 39 * "AS IS" without any express or implied warranty: permission to use, 40 * copy, modify, and distribute this file for any purpose is hereby 41 * granted without fee, provided that the above copyright notices and 42 * this notice appears in all source code copies, and that none of the 43 * names of Open Software Foundation, Inc., Hewlett-Packard Company, 44 * or Digital Equipment Corporation be used in advertising or 45 * publicity pertaining to distribution of the software without 46 * specific, written prior permission. Neither Open Software 47 * Foundation, Inc., Hewlett-Packard Company, Microsoft, nor Digital 48 * Equipment Corporation makes any representations about the 49 * suitability of this software for any purpose. 50 */ 51 52 #include <uuid/uuid.h> 53 #include <stdlib.h> 54 #include <strings.h> 55 #include "uuid_misc.h" 56 57 #define UUCMP(u1, u2) if (u1 != u2) return ((u1 < u2) ? -1 : 1) 58 #define UUIDS_PER_TOD_CALL 10 /* tv_usec is multiplied by 10 */ 59 60 void struct_to_string(uuid_t, struct uuid *); 61 void string_to_struct(struct uuid *, uuid_t); 62 void get_system_time(uuid_time_t *); 63 64 /* 65 * Name: get_current_time 66 * 67 * Description: get-current_time -- get time as 60 bit 100ns ticks 68 * since the beginning of unix time. 69 * Compensate for the fact that real clock resolution is 70 * less than 100ns. 71 * 72 * Returns: None. 73 * 74 */ 75 void 76 get_current_time(uuid_time_t *timestamp) 77 { 78 uuid_time_t time_now; 79 static uuid_time_t time_last = 0; 80 static uint16_t uuids_this_tick = 0; 81 int done; 82 83 done = 0; 84 while (!done) { 85 get_system_time(&time_now); 86 87 /* 88 * if clock reading changed since last UUID generated... 89 */ 90 if (time_last != time_now) { 91 /* 92 * reset count of uuids generated with 93 * this clock reading 94 */ 95 uuids_this_tick = 0; 96 done = 1; 97 } else { 98 uuids_this_tick++; 99 if (uuids_this_tick < UUIDS_PER_TOD_CALL) 100 done = 1; 101 } 102 /* 103 * too many UUIDs for this gettimeofday call; spin 104 */ 105 } 106 time_last = time_now; 107 /* 108 * add the count of uuids to low order bits of the clock reading 109 */ 110 *timestamp = time_now + uuids_this_tick; 111 } 112 113 /* 114 * Name: get_random 115 * 116 * Description: Gets a random number. 117 * 118 * Returns: nbytes of random information. 119 * 120 */ 121 uint16_t 122 get_random(void) 123 { 124 return (arc4random_uniform(UINT16_MAX)); 125 } 126 127 /* 128 * Name: uuid_compare 129 * 130 * Description: Compares 2 uuid strings 131 * 132 * Returns: -1 if u1 < u2, 1 if u1 > u2 and 0 if both are equal 133 */ 134 int 135 uuid_compare(uuid_t uu1, uuid_t uu2) 136 { 137 138 struct uuid uuid1, uuid2; 139 140 string_to_struct(&uuid1, uu1); 141 string_to_struct(&uuid2, uu2); 142 UUCMP(uuid1.time_low, uuid2.time_low); 143 UUCMP(uuid1.time_mid, uuid2.time_mid); 144 UUCMP(uuid1.time_hi_and_version, uuid2.time_hi_and_version); 145 UUCMP(uuid1.clock_seq_hi_and_reserved, uuid2.clock_seq_hi_and_reserved); 146 UUCMP(uuid1.clock_seq_low, uuid2.clock_seq_low); 147 return (memcmp(uuid1.node_addr, uuid2.node_addr, 6)); 148 } 149 150 /* 151 * Name: get_system_time 152 * 153 * Description: system dependent call to get the current system time. 154 * Returned as 100ns ticks since Oct 15, 1582, but 155 * resolution may be less than 100ns. 156 * 157 * Returns: None 158 */ 159 void 160 get_system_time(uuid_time_t *uuid_time) 161 { 162 struct timeval tp; 163 164 (void) gettimeofday(&tp, (struct timezone *)0); 165 166 /* 167 * Offset between UUID formatted times and Unix formatted times. 168 * UUID UTC base time is October 15, 1582. 169 * Unix base time is January 1, 1970. 170 */ 171 *uuid_time = (uint64_t)tp.tv_sec * 10000000; 172 *uuid_time += tp.tv_usec * 10; 173 *uuid_time += 0x01B21DD213814000ULL; 174 } 175