1 /* dtls -- a very basic DTLS implementation
2 *
3 * Copyright (C) 2011--2013 Olaf Bergmann <bergmann@tzi.org>
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use, copy,
9 * modify, merge, publish, distribute, sublicense, and/or sell copies
10 * of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 /**
27 * @file dtls_time.c
28 * @brief Clock Handling
29 */
30
31 #include "tinydtls.h"
32 #include "dtls_config.h"
33 #include "dtls_time.h"
34
35 #ifdef WITH_CONTIKI
36 clock_time_t dtls_clock_offset;
37
38 void
dtls_clock_init(void)39 dtls_clock_init(void) {
40 clock_init();
41 dtls_clock_offset = clock_time();
42 }
43
44 void
dtls_ticks(dtls_tick_t * t)45 dtls_ticks(dtls_tick_t *t) {
46 *t = clock_time();
47 }
48
49 #else /* WITH_CONTIKI */
50
51 time_t dtls_clock_offset;
52
53 void
dtls_clock_init(void)54 dtls_clock_init(void) {
55 #ifdef HAVE_TIME_H
56 dtls_clock_offset = time(NULL);
57 #else
58 # ifdef __GNUC__
59 /* Issue a warning when using gcc. Other prepropressors do
60 * not seem to have a similar feature. */
61 # warning "cannot initialize clock"
62 # endif
63 dtls_clock_offset = 0;
64 #endif
65 }
66
dtls_ticks(dtls_tick_t * t)67 void dtls_ticks(dtls_tick_t *t) {
68 #ifdef HAVE_SYS_TIME_H
69 struct timeval tv;
70 gettimeofday(&tv, NULL);
71 *t = (tv.tv_sec - dtls_clock_offset) * DTLS_TICKS_PER_SECOND
72 + (tv.tv_usec * DTLS_TICKS_PER_SECOND / 1000000);
73 #else
74 #error "clock not implemented"
75 #endif
76 }
77
78 #endif /* WITH_CONTIKI */
79
80
81
