1/*	$NetBSD: stdtime.c,v 1.2.6.1 2012/06/05 21:15:23 bouyer 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
42static inline void
43fix_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
67void
68isc_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