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      1 /*
      2  * iperf, Copyright (c) 2014-2018, The Regents of the University of
      3  * California, through Lawrence Berkeley National Laboratory (subject
      4  * to receipt of any required approvals from the U.S. Dept. of
      5  * Energy).  All rights reserved.
      6  *
      7  * If you have questions about your rights to use or distribute this
      8  * software, please contact Berkeley Lab's Technology Transfer
      9  * Department at TTD (at) lbl.gov.
     10  *
     11  * NOTICE.  This software is owned by the U.S. Department of Energy.
     12  * As such, the U.S. Government has been granted for itself and others
     13  * acting on its behalf a paid-up, nonexclusive, irrevocable,
     14  * worldwide license in the Software to reproduce, prepare derivative
     15  * works, and perform publicly and display publicly.  Beginning five
     16  * (5) years after the date permission to assert copyright is obtained
     17  * from the U.S. Department of Energy, and subject to any subsequent
     18  * five (5) year renewals, the U.S. Government is granted for itself
     19  * and others acting on its behalf a paid-up, nonexclusive,
     20  * irrevocable, worldwide license in the Software to reproduce,
     21  * prepare derivative works, distribute copies to the public, perform
     22  * publicly and display publicly, and to permit others to do so.
     23  *
     24  * This code is distributed under a BSD style license, see the LICENSE
     25  * file for complete information.
     26  */
     27 
     28 
     29 #include <stddef.h>
     30 
     31 #include "iperf_config.h"
     32 #include "iperf_time.h"
     33 
     34 #ifdef HAVE_CLOCK_GETTIME
     35 
     36 #include <time.h>
     37 
     38 int
     39 iperf_time_now(struct iperf_time *time1)
     40 {
     41     struct timespec ts;
     42     int result;
     43     result = clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
     44     if (result == 0) {
     45         time1->secs = (uint32_t) ts.tv_sec;
     46         time1->usecs = (uint32_t) ts.tv_nsec / 1000;
     47     }
     48     return result;
     49 }
     50 
     51 #else
     52 
     53 #include <sys/time.h>
     54 
     55 int
     56 iperf_time_now(struct iperf_time *time1)
     57 {
     58     struct timeval tv;
     59     int result;
     60     result = gettimeofday(&tv, NULL);
     61     time1->secs = tv.tv_sec;
     62     time1->usecs = tv.tv_usec;
     63     return result;
     64 }
     65 
     66 #endif
     67 
     68 /* iperf_time_add_usecs
     69  *
     70  * Add a number of microseconds to a iperf_time.
     71  */
     72 void
     73 iperf_time_add_usecs(struct iperf_time *time1, uint64_t usecs)
     74 {
     75     time1->secs += usecs / 1000000L;
     76     time1->usecs += usecs % 1000000L;
     77     if ( time1->usecs >= 1000000L ) {
     78         time1->secs += time1->usecs / 1000000L;
     79         time1->usecs %= 1000000L;
     80     }
     81 }
     82 
     83 uint64_t
     84 iperf_time_in_usecs(struct iperf_time *time)
     85 {
     86     return time->secs * 1000000LL + time->usecs;
     87 }
     88 
     89 double
     90 iperf_time_in_secs(struct iperf_time *time)
     91 {
     92     return time->secs + time->usecs / 1000000.0;
     93 }
     94 
     95 /* iperf_time_compare
     96  *
     97  * Compare two timestamps
     98  *
     99  * Returns -1 if time1 is earlier, 1 if time1 is later,
    100  * or 0 if the timestamps are equal.
    101  */
    102 int
    103 iperf_time_compare(struct iperf_time *time1, struct iperf_time *time2)
    104 {
    105     if (time1->secs < time2->secs)
    106         return -1;
    107     if (time1->secs > time2->secs)
    108         return 1;
    109     if (time1->usecs < time2->usecs)
    110         return -1;
    111     if (time1->usecs > time2->usecs)
    112         return 1;
    113     return 0;
    114 }
    115 
    116 /* iperf_time_diff
    117  *
    118  * Calculates the time from time2 to time1, assuming time1 is later than time2.
    119  * The diff will always be positive, so the return value should be checked
    120  * to determine if time1 was earlier than time2.
    121  *
    122  * Returns 1 if the time1 is less than or equal to time2, otherwise 0.
    123  */
    124 int
    125 iperf_time_diff(struct iperf_time *time1, struct iperf_time *time2, struct iperf_time *diff)
    126 {
    127     int past = 0;
    128     int cmp = 0;
    129 
    130     cmp = iperf_time_compare(time1, time2);
    131     if (cmp == 0) {
    132         diff->secs = 0;
    133         diff->usecs = 0;
    134         past = 1;
    135     }
    136     else if (cmp == 1) {
    137         diff->secs = time1->secs - time2->secs;
    138         diff->usecs = time1->usecs;
    139         if (diff->usecs < time2->usecs) {
    140             diff->secs -= 1;
    141             diff->usecs += 1000000;
    142         }
    143         diff->usecs = diff->usecs - time2->usecs;
    144     } else {
    145         diff->secs = time2->secs - time1->secs;
    146         diff->usecs = time2->usecs;
    147         if (diff->usecs < time1->usecs) {
    148             diff->secs -= 1;
    149             diff->usecs += 1000000;
    150         }
    151         diff->usecs = diff->usecs - time1->usecs;
    152         past = 1;
    153     }
    154 
    155     return past;
    156 }
    157