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time.h revision 1.2.2.1 
      1 /*	$NetBSD: time.h,v 1.2.2.1 2014/08/10 06:55:39 tls 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 void
     58 do_gettimeofday(struct timeval *tv)
     59 {
     60 	microtime(tv);
     61 }
     62 
     63 static inline bool
     64 timespec_valid(const struct timespec *ts)
     65 {
     66 	if (ts->tv_sec < 0)
     67 		return false;
     68 	if (1000000000L <= ts->tv_nsec)
     69 		return false;
     70 	return true;
     71 }
     72 
     73 static inline struct timespec
     74 ns_to_timespec(const int64_t nsec)
     75 {
     76 	struct timespec ts;
     77 
     78 	ts.tv_sec = (nsec / 1000000000L);
     79 	ts.tv_nsec = (nsec % 1000000000L);
     80 	if (ts.tv_nsec < 0) {
     81 		ts.tv_sec -= 1;
     82 		ts.tv_nsec += 1000000000L;
     83 	}
     84 
     85 	return ts;
     86 }
     87 
     88 static inline int64_t
     89 timespec_to_ns(const struct timespec *ts)
     90 {
     91 	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
     92 }
     93 
     94 static inline struct timeval
     95 ns_to_timeval(int64_t nsec)
     96 {
     97 	struct timespec ts;
     98 	struct timeval tv;
     99 
    100 	ts = ns_to_timespec(nsec);
    101 	TIMESPEC_TO_TIMEVAL(&tv, &ts);
    102 
    103 	return tv;
    104 }
    105 
    106 static inline int64_t
    107 timeval_to_ns(struct timeval *tv)
    108 {
    109 	return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
    110 }
    111 
    112 static inline struct timespec
    113 timespec_sub(struct timespec a, struct timespec b)
    114 {
    115 	struct timespec d;
    116 
    117 	timespecsub(&a, &b, &d);
    118 
    119 	return d;
    120 }
    121 
    122 static inline void
    123 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
    124 {
    125 	while (nsec >= 1000000000L) {
    126 		nsec -= 1000000000L;
    127 		sec += 1;
    128 	}
    129 	while (nsec < 0) {
    130 		nsec += 1000000000L;
    131 		sec -= 1;
    132 	}
    133 	ts->tv_sec = sec;
    134 	ts->tv_nsec = nsec;
    135 }
    136 
    137 #endif  /* _LINUX_TIME_H_ */
    138