1 /* 2 * Copyright (c) 2014-2015 François Tigeot 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 NSEC_PER_USEC 1000L 31 #define NSEC_PER_SEC 1000000000L 32 33 #include <sys/time.h> 34 #include <linux/math64.h> 35 36 static inline struct timeval 37 ns_to_timeval(const int64_t nsec) 38 { 39 struct timeval tv; 40 long rem; 41 42 if (nsec == 0) { 43 tv.tv_sec = 0; 44 tv.tv_usec = 0; 45 return (tv); 46 } 47 48 tv.tv_sec = nsec / NSEC_PER_SEC; 49 rem = nsec % NSEC_PER_SEC; 50 if (rem < 0) { 51 tv.tv_sec--; 52 rem += NSEC_PER_SEC; 53 } 54 tv.tv_usec = rem / 1000; 55 return (tv); 56 } 57 58 static inline int64_t 59 timeval_to_ns(const struct timeval *tv) 60 { 61 return ((int64_t)tv->tv_sec * NSEC_PER_SEC) + 62 tv->tv_usec * NSEC_PER_USEC; 63 } 64 65 #define getrawmonotonic(ts) nanouptime(ts) 66 67 static inline struct timespec 68 timespec_sub(struct timespec lhs, struct timespec rhs) 69 { 70 struct timespec ts; 71 72 ts.tv_sec = lhs.tv_sec; 73 ts.tv_nsec = lhs.tv_nsec; 74 timespecsub(&ts, &rhs); 75 76 return ts; 77 } 78 79 static inline void 80 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 81 { 82 /* XXX: this doesn't actually normalize anything */ 83 ts->tv_sec = sec; 84 ts->tv_nsec = nsec; 85 } 86 87 static inline int64_t 88 timespec_to_ns(const struct timespec *ts) 89 { 90 return ((ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec); 91 } 92 93 static inline struct timespec 94 ns_to_timespec(const int64_t nsec) 95 { 96 struct timespec ts; 97 int32_t rem; 98 99 if (nsec == 0) { 100 ts.tv_sec = 0; 101 ts.tv_nsec = 0; 102 return (ts); 103 } 104 105 ts.tv_sec = nsec / NSEC_PER_SEC; 106 rem = nsec % NSEC_PER_SEC; 107 if (rem < 0) { 108 ts.tv_sec--; 109 rem += NSEC_PER_SEC; 110 } 111 ts.tv_nsec = rem; 112 return (ts); 113 } 114 115 static inline int 116 timespec_valid(const struct timespec *ts) 117 { 118 if (ts->tv_sec < 0 || ts->tv_sec > 100000000 || 119 ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 120 return (0); 121 return (1); 122 } 123 124 static inline unsigned long 125 get_seconds(void) 126 { 127 return time_uptime; 128 } 129 130 #endif /* _LINUX_TIME_H_ */ 131