1 /* 2 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_TIME_H_ 28 #define _LINUX_TIME_H_ 29 30 #define USEC_PER_MSEC 1000L 31 #define USEC_PER_SEC 1000000L 32 33 #define NSEC_PER_USEC 1000L 34 #define NSEC_PER_MSEC 1000000L 35 #define NSEC_PER_SEC 1000000000L 36 37 #include <linux/cache.h> 38 #include <linux/seqlock.h> 39 #include <linux/math64.h> 40 #include <linux/time64.h> 41 42 #include <sys/time.h> 43 44 static inline struct timeval 45 ns_to_timeval(const int64_t nsec) 46 { 47 struct timeval tv; 48 long rem; 49 50 if (nsec == 0) { 51 tv.tv_sec = 0; 52 tv.tv_usec = 0; 53 return (tv); 54 } 55 56 tv.tv_sec = nsec / NSEC_PER_SEC; 57 rem = nsec % NSEC_PER_SEC; 58 if (rem < 0) { 59 tv.tv_sec--; 60 rem += NSEC_PER_SEC; 61 } 62 tv.tv_usec = rem / 1000; 63 return (tv); 64 } 65 66 static inline int64_t 67 timeval_to_ns(const struct timeval *tv) 68 { 69 return ((int64_t)tv->tv_sec * NSEC_PER_SEC) + 70 tv->tv_usec * NSEC_PER_USEC; 71 } 72 73 #define getrawmonotonic(ts) nanouptime(ts) 74 75 static inline struct timespec 76 timespec_sub(struct timespec lhs, struct timespec rhs) 77 { 78 struct timespec ts; 79 80 timespecsub(&lhs, &rhs, &ts); 81 82 return ts; 83 } 84 85 static inline void 86 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 87 { 88 /* XXX: this doesn't actually normalize anything */ 89 ts->tv_sec = sec; 90 ts->tv_nsec = nsec; 91 } 92 93 static inline int64_t 94 timespec_to_ns(const struct timespec *ts) 95 { 96 return ((ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec); 97 } 98 99 static inline struct timespec 100 ns_to_timespec(const int64_t nsec) 101 { 102 struct timespec ts; 103 int32_t rem; 104 105 if (nsec == 0) { 106 ts.tv_sec = 0; 107 ts.tv_nsec = 0; 108 return (ts); 109 } 110 111 ts.tv_sec = nsec / NSEC_PER_SEC; 112 rem = nsec % NSEC_PER_SEC; 113 if (rem < 0) { 114 ts.tv_sec--; 115 rem += NSEC_PER_SEC; 116 } 117 ts.tv_nsec = rem; 118 return (ts); 119 } 120 121 static inline int 122 timespec_valid(const struct timespec *ts) 123 { 124 if (ts->tv_sec < 0 || ts->tv_sec > 100000000 || 125 ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 126 return (0); 127 return (1); 128 } 129 130 static inline unsigned long 131 get_seconds(void) 132 { 133 return time_uptime; 134 } 135 136 #endif /* _LINUX_TIME_H_ */ 137