1 /* $NetBSD: time.h,v 1.5 2018/08/27 07:02:16 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 NSEC_PER_MSEC 1000000L 38 39 /* 40 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to 41 * happen on 32-bit systems because it returns unsigned long. Some 42 * callers in Linux (implicitly) convert the result to time_t, though. 43 * We'll pretend get_seconds returns time_t and make sure all our 44 * callers treat it as if it did. 45 */ 46 47 static inline time_t 48 get_seconds(void) 49 { 50 return time_second; 51 } 52 53 static inline void 54 getrawmonotonic(struct timespec *ts) 55 { 56 getnanouptime(ts); 57 } 58 59 static inline void 60 do_gettimeofday(struct timeval *tv) 61 { 62 microtime(tv); 63 } 64 65 static inline bool 66 timespec_valid(const struct timespec *ts) 67 { 68 if (ts->tv_sec < 0) 69 return false; 70 if (1000000000L <= ts->tv_nsec) 71 return false; 72 return true; 73 } 74 75 static inline struct timespec 76 ns_to_timespec(const int64_t nsec) 77 { 78 struct timespec ts; 79 80 ts.tv_sec = (nsec / 1000000000L); 81 ts.tv_nsec = (nsec % 1000000000L); 82 if (ts.tv_nsec < 0) { 83 ts.tv_sec -= 1; 84 ts.tv_nsec += 1000000000L; 85 } 86 87 return ts; 88 } 89 90 static inline int64_t 91 timespec_to_ns(const struct timespec *ts) 92 { 93 return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec); 94 } 95 96 static inline struct timeval 97 ns_to_timeval(int64_t nsec) 98 { 99 struct timespec ts; 100 struct timeval tv; 101 102 ts = ns_to_timespec(nsec); 103 TIMESPEC_TO_TIMEVAL(&tv, &ts); 104 105 return tv; 106 } 107 108 static inline int64_t 109 timeval_to_ns(const struct timeval *tv) 110 { 111 return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul)); 112 } 113 114 static inline struct timespec 115 timespec_sub(struct timespec a, struct timespec b) 116 { 117 struct timespec d; 118 119 timespecsub(&a, &b, &d); 120 121 return d; 122 } 123 124 static inline void 125 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 126 { 127 while (nsec >= 1000000000L) { 128 nsec -= 1000000000L; 129 sec += 1; 130 } 131 while (nsec < 0) { 132 nsec += 1000000000L; 133 sec -= 1; 134 } 135 ts->tv_sec = sec; 136 ts->tv_nsec = nsec; 137 } 138 139 #endif /* _LINUX_TIME_H_ */ 140