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