contrib/bind-9.2.4rc7/lib/isc/unix/stdtime.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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 1.11.2.2 2004/03/09 06:12:12 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <stdlib.h>     /* NULL */
  23 #include <syslog.h>
  24
  25 #include <sys/time.h>
  26
  27 #include <isc/stdtime.h>
  28 #include <isc/util.h>
  29
  30 #ifndef ISC_FIX_TV_USEC
  31 #define ISC_FIX_TV_USEC 1
  32 #endif
  33
  34 #define US_PER_S 1000000
  35
  36 #if ISC_FIX_TV_USEC
  37 static inline void
  38 fix_tv_usec(struct timeval *tv) {
  39         isc_boolean_t fixed = ISC_FALSE;
  40
  41         if (tv->tv_usec < 0) {
  42                 fixed = ISC_TRUE;
  43                 do {
  44                         tv->tv_sec -= 1;
  45                         tv->tv_usec += US_PER_S;
  46                 } while (tv->tv_usec < 0);
  47         } else if (tv->tv_usec >= US_PER_S) {
  48                 fixed = ISC_TRUE;
  49                 do {
  50                         tv->tv_sec += 1;
  51                         tv->tv_usec -= US_PER_S;
  52                 } while (tv->tv_usec >=US_PER_S);
  53         }
  54         /*
  55          * Call syslog directly as we are called from the logging functions.
  56          */
  57         if (fixed)
  58                 syslog(LOG_ERR, "gettimeofday returned bad tv_usec: corrected");
  59 }
  60 #endif
  61
  62 void
  63 isc_stdtime_get(isc_stdtime_t *t) {
  64         struct timeval tv;
  65
  66         /*
  67          * Set 't' to the number of seconds since 00:00:00 UTC, January 1,
  68          * 1970.
  69          */
  70
  71         REQUIRE(t != NULL);
  72
  73         RUNTIME_CHECK(gettimeofday(&tv, NULL) != -1);
  74
  75 #if ISC_FIX_TV_USEC
  76         fix_tv_usec(&tv);
  77         INSIST(tv.tv_usec >= 0);
  78 #else
  79         INSIST(tv.tv_usec >= 0 && tv.tv_usec < US_PER_S);
  80 #endif
  81
  82         *t = (unsigned int)tv.tv_sec;
  83 }