time.h revision 1.6
1/* $NetBSD: time.h,v 1.6 2021/12/19 01:16:28 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#define timespec64 timespec /* take that, 2038 */ 38 39#define NSEC_PER_MSEC 1000000L 40 41/* 42 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to 43 * happen on 32-bit systems because it returns unsigned long. Some 44 * callers in Linux (implicitly) convert the result to time_t, though. 45 * We'll pretend get_seconds returns time_t and make sure all our 46 * callers treat it as if it did. 47 */ 48 49static inline time_t 50get_seconds(void) 51{ 52 return time_second; 53} 54 55static inline void 56getrawmonotonic(struct timespec *ts) 57{ 58 getnanouptime(ts); 59} 60 61static inline void 62do_gettimeofday(struct timeval *tv) 63{ 64 microtime(tv); 65} 66 67static inline bool 68timespec_valid(const struct timespec *ts) 69{ 70 if (ts->tv_sec < 0) 71 return false; 72 if (1000000000L <= ts->tv_nsec) 73 return false; 74 return true; 75} 76 77static inline struct timespec 78ns_to_timespec(const int64_t nsec) 79{ 80 struct timespec ts; 81 82 ts.tv_sec = (nsec / 1000000000L); 83 ts.tv_nsec = (nsec % 1000000000L); 84 if (ts.tv_nsec < 0) { 85 ts.tv_sec -= 1; 86 ts.tv_nsec += 1000000000L; 87 } 88 89 return ts; 90} 91 92static inline int64_t 93timespec_to_ns(const struct timespec *ts) 94{ 95 return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec); 96} 97 98static inline struct timeval 99ns_to_timeval(int64_t nsec) 100{ 101 struct timespec ts; 102 struct timeval tv; 103 104 ts = ns_to_timespec(nsec); 105 TIMESPEC_TO_TIMEVAL(&tv, &ts); 106 107 return tv; 108} 109 110static inline int64_t 111timeval_to_ns(const struct timeval *tv) 112{ 113 return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul)); 114} 115 116static inline struct timespec 117timespec_sub(struct timespec a, struct timespec b) 118{ 119 struct timespec d; 120 121 timespecsub(&a, &b, &d); 122 123 return d; 124} 125 126static inline void 127set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 128{ 129 while (nsec >= 1000000000L) { 130 nsec -= 1000000000L; 131 sec += 1; 132 } 133 while (nsec < 0) { 134 nsec += 1000000000L; 135 sec -= 1; 136 } 137 ts->tv_sec = sec; 138 ts->tv_nsec = nsec; 139} 140 141#endif /* _LINUX_TIME_H_ */ 142