external/gpl2/lvm2/dist/lib/misc/timestamp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2006 Rackable Systems All rights reserved.
   5  *
   6  * This file is part of LVM2.
   7  *
   8  * This copyrighted material is made available to anyone wishing to use,
   9  * modify, copy, or redistribute it subject to the terms and conditions
  10  * of the GNU Lesser General Public License v.2.1.
  11  *
  12  * You should have received a copy of the GNU Lesser General Public License
  13  * along with this program; if not, write to the Free Software Foundation,
  14  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  */
  16
  17 /*
  18  * Abstract out the time methods used so they can be adjusted later -
  19  * the results of these routines should stay in-core.  This implementation
  20  * requires librt.
  21  */
  22
  23 #include "lib.h"
  24 #include <stdlib.h>
  25
  26 #include "timestamp.h"
  27
  28 /*
  29  * The realtime section uses clock_gettime with the CLOCK_MONOTONIC
  30  * parameter to prevent issues with time warps
  31  */
  32 #ifdef HAVE_REALTIME
  33
  34 #include <time.h>
  35 #include <bits/time.h>
  36
  37 struct timestamp {
  38         struct timespec t;
  39 };
  40
  41 struct timestamp *get_timestamp(void)
  42 {
  43         struct timestamp *ts = NULL;
  44
  45         if (!(ts = dm_malloc(sizeof(*ts))))
  46                 return_NULL;
  47
  48         if (clock_gettime(CLOCK_MONOTONIC, &ts->t)) {
  49                 log_sys_error("clock_gettime", "get_timestamp");
  50                 return NULL;
  51         }
  52
  53         return ts;
  54 }
  55
  56 /* cmp_timestamp: Compare two timestamps
  57  *
  58  * Return: -1 if t1 is less than t2
  59  *          0 if t1 is equal to t2
  60  *          1 if t1 is greater than t2
  61  */
  62 int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
  63 {
  64         if(t1->t.tv_sec < t2->t.tv_sec)
  65                 return -1;
  66         if(t1->t.tv_sec > t2->t.tv_sec)
  67                 return 1;
  68
  69         if(t1->t.tv_nsec < t2->t.tv_nsec)
  70                 return -1;
  71         if(t1->t.tv_nsec > t2->t.tv_nsec)
  72                 return 1;
  73
  74         return 0;
  75 }
  76
  77 #else /* ! HAVE_REALTIME */
  78
  79 /*
  80  * The !realtime section just uses gettimeofday and is therefore subject
  81  * to ntp-type time warps - not sure if should allow that.
  82  */
  83
  84 #include <sys/time.h>
  85
  86 struct timestamp {
  87         struct timeval t;
  88 };
  89
  90 struct timestamp *get_timestamp(void)
  91 {
  92         struct timestamp *ts = NULL;
  93
  94         if (!(ts = dm_malloc(sizeof(*ts))))
  95                 return_NULL;
  96
  97         if (gettimeofday(&ts->t, NULL)) {
  98                 log_sys_error("gettimeofday", "get_timestamp");
  99                 return NULL;
 100         }
 101
 102         return ts;
 103 }
 104
 105 /* cmp_timestamp: Compare two timestamps
 106  *
 107  * Return: -1 if t1 is less than t2
 108  *          0 if t1 is equal to t2
 109  *          1 if t1 is greater than t2
 110  */
 111 int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
 112 {
 113         if(t1->t.tv_sec < t2->t.tv_sec)
 114                 return -1;
 115         if(t1->t.tv_sec > t2->t.tv_sec)
 116                 return 1;
 117
 118         if(t1->t.tv_usec < t2->t.tv_usec)
 119                 return -1;
 120         if(t1->t.tv_usec > t2->t.tv_usec)
 121                 return 1;
 122
 123         return 0;
 124 }
 125
 126 #endif /* HAVE_REALTIME */
 127
 128 void destroy_timestamp(struct timestamp *t)
 129 {
 130         if (t)
 131                 dm_free(t);
 132 }