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time.h revision 1.3.28.1 
      1 /*	$NetBSD: time.h,v 1.3.28.1 2018/09/06 06:56:36 pgoyette 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 #define NSEC_PER_MSEC	1000000L
     38 
     39 /*
     40  * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
     41  * happen on 32-bit systems because it returns unsigned long.  Some
     42  * callers in Linux (implicitly) convert the result to time_t, though.
     43  * We'll pretend get_seconds returns time_t and make sure all our
     44  * callers treat it as if it did.
     45  */
     46 
     47 static inline time_t
     48 get_seconds(void)
     49 {
     50 	return time_second;
     51 }
     52 
     53 static inline void
     54 getrawmonotonic(struct timespec *ts)
     55 {
     56 	getnanouptime(ts);
     57 }
     58 
     59 static inline void
     60 do_gettimeofday(struct timeval *tv)
     61 {
     62 	microtime(tv);
     63 }
     64 
     65 static inline bool
     66 timespec_valid(const struct timespec *ts)
     67 {
     68 	if (ts->tv_sec < 0)
     69 		return false;
     70 	if (1000000000L <= ts->tv_nsec)
     71 		return false;
     72 	return true;
     73 }
     74 
     75 static inline struct timespec
     76 ns_to_timespec(const int64_t nsec)
     77 {
     78 	struct timespec ts;
     79 
     80 	ts.tv_sec = (nsec / 1000000000L);
     81 	ts.tv_nsec = (nsec % 1000000000L);
     82 	if (ts.tv_nsec < 0) {
     83 		ts.tv_sec -= 1;
     84 		ts.tv_nsec += 1000000000L;
     85 	}
     86 
     87 	return ts;
     88 }
     89 
     90 static inline int64_t
     91 timespec_to_ns(const struct timespec *ts)
     92 {
     93 	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
     94 }
     95 
     96 static inline struct timeval
     97 ns_to_timeval(int64_t nsec)
     98 {
     99 	struct timespec ts;
    100 	struct timeval tv;
    101 
    102 	ts = ns_to_timespec(nsec);
    103 	TIMESPEC_TO_TIMEVAL(&tv, &ts);
    104 
    105 	return tv;
    106 }
    107 
    108 static inline int64_t
    109 timeval_to_ns(const struct timeval *tv)
    110 {
    111 	return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
    112 }
    113 
    114 static inline struct timespec
    115 timespec_sub(struct timespec a, struct timespec b)
    116 {
    117 	struct timespec d;
    118 
    119 	timespecsub(&a, &b, &d);
    120 
    121 	return d;
    122 }
    123 
    124 static inline void
    125 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
    126 {
    127 	while (nsec >= 1000000000L) {
    128 		nsec -= 1000000000L;
    129 		sec += 1;
    130 	}
    131 	while (nsec < 0) {
    132 		nsec += 1000000000L;
    133 		sec -= 1;
    134 	}
    135 	ts->tv_sec = sec;
    136 	ts->tv_nsec = nsec;
    137 }
    138 
    139 #endif  /* _LINUX_TIME_H_ */
    140