1 /* $NetBSD: timestamp.c,v 1.1.1.1 2008/12/22 00:18:13 haad Exp $ */
2
3 /*
4 * Copyright (C) 2006 Rackable Systems All rights reserved.
5 *
6 * This file is part of LVM2.
7 *
8 * This copyrighted material is made available to anyone wishing to use,
9 * modify, copy, or redistribute it subject to the terms and conditions
10 * of the GNU Lesser General Public License v.2.1.
11 *
12 * You should have received a copy of the GNU Lesser General Public License
13 * along with this program; if not, write to the Free Software Foundation,
14 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17 /*
18 * Abstract out the time methods used so they can be adjusted later -
19 * the results of these routines should stay in-core. This implementation
20 * requires librt.
21 */
22
23 #include "lib.h"
24 #include <stdlib.h>
25
26 #include "timestamp.h"
27
28 /*
29 * The realtime section uses clock_gettime with the CLOCK_MONOTONIC
30 * parameter to prevent issues with time warps
31 */
32 #ifdef HAVE_REALTIME
33
34 #include <time.h>
35 #include <bits/time.h>
36
37 struct timestamp {
38 struct timespec t;
39 };
40
get_timestamp(void)41 struct timestamp *get_timestamp(void)
42 {
43 struct timestamp *ts = NULL;
44
45 if (!(ts = dm_malloc(sizeof(*ts))))
46 return_NULL;
47
48 if (clock_gettime(CLOCK_MONOTONIC, &ts->t)) {
49 log_sys_error("clock_gettime", "get_timestamp");
50 return NULL;
51 }
52
53 return ts;
54 }
55
56 /* cmp_timestamp: Compare two timestamps
57 *
58 * Return: -1 if t1 is less than t2
59 * 0 if t1 is equal to t2
60 * 1 if t1 is greater than t2
61 */
cmp_timestamp(struct timestamp * t1,struct timestamp * t2)62 int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
63 {
64 if(t1->t.tv_sec < t2->t.tv_sec)
65 return -1;
66 if(t1->t.tv_sec > t2->t.tv_sec)
67 return 1;
68
69 if(t1->t.tv_nsec < t2->t.tv_nsec)
70 return -1;
71 if(t1->t.tv_nsec > t2->t.tv_nsec)
72 return 1;
73
74 return 0;
75 }
76
77 #else /* ! HAVE_REALTIME */
78
79 /*
80 * The !realtime section just uses gettimeofday and is therefore subject
81 * to ntp-type time warps - not sure if should allow that.
82 */
83
84 #include <sys/time.h>
85
86 struct timestamp {
87 struct timeval t;
88 };
89
get_timestamp(void)90 struct timestamp *get_timestamp(void)
91 {
92 struct timestamp *ts = NULL;
93
94 if (!(ts = dm_malloc(sizeof(*ts))))
95 return_NULL;
96
97 if (gettimeofday(&ts->t, NULL)) {
98 log_sys_error("gettimeofday", "get_timestamp");
99 return NULL;
100 }
101
102 return ts;
103 }
104
105 /* cmp_timestamp: Compare two timestamps
106 *
107 * Return: -1 if t1 is less than t2
108 * 0 if t1 is equal to t2
109 * 1 if t1 is greater than t2
110 */
cmp_timestamp(struct timestamp * t1,struct timestamp * t2)111 int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
112 {
113 if(t1->t.tv_sec < t2->t.tv_sec)
114 return -1;
115 if(t1->t.tv_sec > t2->t.tv_sec)
116 return 1;
117
118 if(t1->t.tv_usec < t2->t.tv_usec)
119 return -1;
120 if(t1->t.tv_usec > t2->t.tv_usec)
121 return 1;
122
123 return 0;
124 }
125
126 #endif /* HAVE_REALTIME */
127
destroy_timestamp(struct timestamp * t)128 void destroy_timestamp(struct timestamp *t)
129 {
130 if (t)
131 dm_free(t);
132 }
133