1 /*-
2  * Copyright (c) 2016 Maksym Sobolyev <sobomax@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/time.h>
31 #include <time.h>
32 
33 #include "uc_check_time.h"
34 
35 static const struct timeval max_diff_tv = {.tv_sec = 1, .tv_usec = 0};
36 static const struct timespec max_diff_ts = {.tv_sec = 1, .tv_nsec = 0};
37 
38 #define timespeccmp(tvp, uvp, cmp)                                      \
39 	(((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
40 	    ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
41 	    ((tvp)->tv_sec cmp (uvp)->tv_sec))
42 #define timespecsub(vvp, uvp)                                           \
43 	do {                                                            \
44 		(vvp)->tv_sec -= (uvp)->tv_sec;                         \
45 		(vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
46 		if ((vvp)->tv_nsec < 0) {                               \
47 			(vvp)->tv_sec--;                                \
48 			(vvp)->tv_nsec += 1000000000;                   \
49 		}                                                       \
50 	} while (0)
51 
52 int
53 uc_check_bintime(const struct bintime *mt)
54 {
55 	struct timespec bt;
56 
57 	bintime2timespec(mt, &bt);
58 	return (uc_check_timespec_real(&bt));
59 }
60 
61 int
62 uc_check_timeval(const struct timeval *bt)
63 {
64 	struct timeval ct, dt;
65 
66 	if (gettimeofday(&ct, NULL) < 0)
67 		return (-1);
68 	timersub(&ct, bt, &dt);
69 	if (!timercmp(&dt, &max_diff_tv, <))
70 		return (-1);
71 
72 	return (0);
73 }
74 
75 int
76 uc_check_timespec_real(const struct timespec *bt)
77 {
78 	struct timespec ct;
79 
80 	if (clock_gettime(CLOCK_REALTIME, &ct) < 0)
81 		return (-1);
82 	timespecsub(&ct, bt);
83 	if (!timespeccmp(&ct, &max_diff_ts, <))
84 		return (-1);
85 
86 	return (0);
87 }
88 
89 int
90 uc_check_timespec_mono(const struct timespec *bt)
91 {
92 	struct timespec ct;
93 
94 	if (clock_gettime(CLOCK_MONOTONIC, &ct) < 0)
95 		return (-1);
96 	timespecsub(&ct, bt);
97 	if (!timespeccmp(&ct, &max_diff_ts, <))
98 		return (-1);
99 
100 	return (0);
101 }
102