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@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
iperf_time_now(struct iperf_time * time1)39 iperf_time_now(struct iperf_time *time1)
40 {
41 struct timespec ts;
42 int result;
43 result = clock_gettime(CLOCK_MONOTONIC, &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
iperf_time_now(struct iperf_time * time1)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
iperf_time_add_usecs(struct iperf_time * time1,uint64_t usecs)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
iperf_time_in_usecs(struct iperf_time * time)84 iperf_time_in_usecs(struct iperf_time *time)
85 {
86 return time->secs * 1000000LL + time->usecs;
87 }
88
89 double
iperf_time_in_secs(struct iperf_time * time)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
iperf_time_compare(struct iperf_time * time1,struct iperf_time * time2)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
iperf_time_diff(struct iperf_time * time1,struct iperf_time * time2,struct iperf_time * diff)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