1 /* $NetBSD: time.h,v 1.11 2021/12/19 12:30:23 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_TIME_H_ 33 #define _LINUX_TIME_H_ 34 35 #include <sys/time.h> 36 37 #include <linux/math64.h> 38 #include <linux/seqlock.h> 39 40 #define timespec64 timespec /* take that, 2038 */ 41 42 #define NSEC_PER_USEC 1000L 43 #define NSEC_PER_MSEC 1000000L 44 #define NSEC_PER_SEC 1000000000L 45 #define USEC_PER_MSEC 1000L 46 47 /* 48 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to 49 * happen on 32-bit systems because it returns unsigned long. Some 50 * callers in Linux (implicitly) convert the result to time_t, though. 51 * We'll pretend get_seconds returns time_t and make sure all our 52 * callers treat it as if it did. 53 */ 54 55 static inline time_t 56 get_seconds(void) 57 { 58 return time_second; 59 } 60 61 static inline void 62 getrawmonotonic(struct timespec *ts) 63 { 64 getnanouptime(ts); 65 } 66 67 static inline void 68 do_gettimeofday(struct timeval *tv) 69 { 70 microtime(tv); 71 } 72 73 static inline bool 74 timespec_valid(const struct timespec *ts) 75 { 76 if (ts->tv_sec < 0) 77 return false; 78 if (1000000000L <= ts->tv_nsec) 79 return false; 80 return true; 81 } 82 83 static inline struct timespec 84 ns_to_timespec(const int64_t nsec) 85 { 86 struct timespec ts; 87 88 ts.tv_sec = (nsec / 1000000000L); 89 ts.tv_nsec = (nsec % 1000000000L); 90 if (ts.tv_nsec < 0) { 91 ts.tv_sec -= 1; 92 ts.tv_nsec += 1000000000L; 93 } 94 95 return ts; 96 } 97 98 static inline int64_t 99 timespec_to_ns(const struct timespec *ts) 100 { 101 return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec); 102 } 103 104 static inline struct timeval 105 ns_to_timeval(int64_t nsec) 106 { 107 struct timespec ts; 108 struct timeval tv; 109 110 ts = ns_to_timespec(nsec); 111 TIMESPEC_TO_TIMEVAL(&tv, &ts); 112 113 return tv; 114 } 115 116 static inline int64_t 117 timeval_to_ns(const struct timeval *tv) 118 { 119 return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul)); 120 } 121 122 static inline struct timespec 123 timespec_sub(struct timespec a, struct timespec b) 124 { 125 struct timespec d; 126 127 timespecsub(&a, &b, &d); 128 129 return d; 130 } 131 132 static inline void 133 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 134 { 135 while (nsec >= 1000000000L) { 136 nsec -= 1000000000L; 137 sec += 1; 138 } 139 while (nsec < 0) { 140 nsec += 1000000000L; 141 sec -= 1; 142 } 143 ts->tv_sec = sec; 144 ts->tv_nsec = nsec; 145 } 146 147 static inline bool 148 time_after32(uint32_t a, uint32_t b) 149 { 150 return (int32_t)(b - a) < 0; 151 } 152 153 #endif /* _LINUX_TIME_H_ */ 154