1 /* $NetBSD: stdtime.c,v 1.6 2020/05/25 20:47:23 christos Exp $ */
2
3 /*
4 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1999-2001 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /* Id: stdtime.c,v 1.19 2007/06/19 23:47:18 tbox Exp */
21
22 /*! \file */
23
24 #include <config.h>
25
26 #include <stddef.h> /* NULL */
27 #include <stdlib.h> /* NULL */
28 #include <syslog.h>
29
30 #include <sys/time.h>
31
32 #include <isc/stdtime.h>
33 #include <isc/util.h>
34
35 #ifndef ISC_FIX_TV_USEC
36 #define ISC_FIX_TV_USEC 1
37 #endif
38
39 #define US_PER_S 1000000
40
41 #if ISC_FIX_TV_USEC
42 static inline void
fix_tv_usec(struct timeval * tv)43 fix_tv_usec(struct timeval *tv) {
44 isc_boolean_t fixed = ISC_FALSE;
45
46 if (tv->tv_usec < 0) {
47 fixed = ISC_TRUE;
48 do {
49 tv->tv_sec -= 1;
50 tv->tv_usec += US_PER_S;
51 } while (tv->tv_usec < 0);
52 } else if (tv->tv_usec >= US_PER_S) {
53 fixed = ISC_TRUE;
54 do {
55 tv->tv_sec += 1;
56 tv->tv_usec -= US_PER_S;
57 } while (tv->tv_usec >=US_PER_S);
58 }
59 /*
60 * Call syslog directly as we are called from the logging functions.
61 */
62 if (fixed)
63 (void)syslog(LOG_ERR, "gettimeofday returned bad tv_usec: corrected");
64 }
65 #endif
66
67 void
isc_stdtime_get(isc_stdtime_t * t)68 isc_stdtime_get(isc_stdtime_t *t) {
69 struct timeval tv;
70
71 /*
72 * Set 't' to the number of seconds since 00:00:00 UTC, January 1,
73 * 1970.
74 */
75
76 REQUIRE(t != NULL);
77
78 RUNTIME_CHECK(gettimeofday(&tv, NULL) != -1);
79
80 #if ISC_FIX_TV_USEC
81 fix_tv_usec(&tv);
82 INSIST(tv.tv_usec >= 0);
83 #else
84 INSIST(tv.tv_usec >= 0 && tv.tv_usec < US_PER_S);
85 #endif
86
87 *t = (unsigned int)tv.tv_sec;
88 }
89