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