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 USEC_PER_SEC 1000000L 31 32 #define NSEC_PER_USEC 1000L 33 #define NSEC_PER_MSEC 1000000L 34 #define NSEC_PER_SEC 1000000000L 35 36 #include <sys/time.h> 37 #include <linux/math64.h> 38 39 static inline struct timeval 40 ns_to_timeval(const int64_t nsec) 41 { 42 struct timeval tv; 43 long rem; 44 45 if (nsec == 0) { 46 tv.tv_sec = 0; 47 tv.tv_usec = 0; 48 return (tv); 49 } 50 51 tv.tv_sec = nsec / NSEC_PER_SEC; 52 rem = nsec % NSEC_PER_SEC; 53 if (rem < 0) { 54 tv.tv_sec--; 55 rem += NSEC_PER_SEC; 56 } 57 tv.tv_usec = rem / 1000; 58 return (tv); 59 } 60 61 static inline int64_t 62 timeval_to_ns(const struct timeval *tv) 63 { 64 return ((int64_t)tv->tv_sec * NSEC_PER_SEC) + 65 tv->tv_usec * NSEC_PER_USEC; 66 } 67 68 #define getrawmonotonic(ts) nanouptime(ts) 69 70 static inline struct timespec 71 timespec_sub(struct timespec lhs, struct timespec rhs) 72 { 73 struct timespec ts; 74 75 ts.tv_sec = lhs.tv_sec; 76 ts.tv_nsec = lhs.tv_nsec; 77 timespecsub(&ts, &rhs); 78 79 return ts; 80 } 81 82 static inline void 83 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 84 { 85 /* XXX: this doesn't actually normalize anything */ 86 ts->tv_sec = sec; 87 ts->tv_nsec = nsec; 88 } 89 90 static inline int64_t 91 timespec_to_ns(const struct timespec *ts) 92 { 93 return ((ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec); 94 } 95 96 static inline struct timespec 97 ns_to_timespec(const int64_t nsec) 98 { 99 struct timespec ts; 100 int32_t rem; 101 102 if (nsec == 0) { 103 ts.tv_sec = 0; 104 ts.tv_nsec = 0; 105 return (ts); 106 } 107 108 ts.tv_sec = nsec / NSEC_PER_SEC; 109 rem = nsec % NSEC_PER_SEC; 110 if (rem < 0) { 111 ts.tv_sec--; 112 rem += NSEC_PER_SEC; 113 } 114 ts.tv_nsec = rem; 115 return (ts); 116 } 117 118 static inline int 119 timespec_valid(const struct timespec *ts) 120 { 121 if (ts->tv_sec < 0 || ts->tv_sec > 100000000 || 122 ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) 123 return (0); 124 return (1); 125 } 126 127 static inline unsigned long 128 get_seconds(void) 129 { 130 return time_uptime; 131 } 132 133 #endif /* _LINUX_TIME_H_ */ 134