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 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 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