1 /* $NetBSD: time.h,v 1.2 2014/03/18 18:20:43 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 /* 38 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to 39 * happen on 32-bit systems because it returns unsigned long. Some 40 * callers in Linux (implicitly) convert the result to time_t, though. 41 * We'll pretend get_seconds returns time_t and make sure all our 42 * callers treat it as if it did. 43 */ 44 45 static inline time_t 46 get_seconds(void) 47 { 48 return time_second; 49 } 50 51 static inline void 52 getrawmonotonic(struct timespec *ts) 53 { 54 getnanouptime(ts); 55 } 56 57 static inline bool 58 timespec_valid(const struct timespec *ts) 59 { 60 if (ts->tv_sec < 0) 61 return false; 62 if (1000000000L <= ts->tv_nsec) 63 return false; 64 return true; 65 } 66 67 static inline struct timespec 68 ns_to_timespec(const int64_t nsec) 69 { 70 struct timespec ts; 71 72 ts.tv_sec = (nsec / 1000000000L); 73 ts.tv_nsec = (nsec % 1000000000L); 74 if (ts.tv_nsec < 0) { 75 ts.tv_sec -= 1; 76 ts.tv_nsec += 1000000000L; 77 } 78 79 return ts; 80 } 81 82 static inline int64_t 83 timespec_to_ns(const struct timespec *ts) 84 { 85 return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec); 86 } 87 88 static inline struct timespec 89 timespec_sub(struct timespec a, struct timespec b) 90 { 91 struct timespec d; 92 93 timespecsub(&a, &b, &d); 94 95 return d; 96 } 97 98 static inline void 99 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec) 100 { 101 while (nsec >= 1000000000L) { 102 nsec -= 1000000000L; 103 sec += 1; 104 } 105 while (nsec < 0) { 106 nsec += 1000000000L; 107 sec -= 1; 108 } 109 ts->tv_sec = sec; 110 ts->tv_nsec = nsec; 111 } 112 113 #endif /* _LINUX_TIME_H_ */ 114