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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/misc/timestamp.c
Zdenek Kabelac 5ba08f195a Skip NULL check before dm_free
dm_free checks for NULL itself.
2011-01-28 10:16:04 +00:00

130 lines
2.6 KiB
C

/*
* Copyright (C) 2006 Rackable Systems All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Abstract out the time methods used so they can be adjusted later -
* the results of these routines should stay in-core. This implementation
* requires librt.
*/
#include "lib.h"
#include <stdlib.h>
#include "timestamp.h"
/*
* The realtime section uses clock_gettime with the CLOCK_MONOTONIC
* parameter to prevent issues with time warps
*/
#ifdef HAVE_REALTIME
#include <time.h>
#include <bits/time.h>
struct timestamp {
struct timespec t;
};
struct timestamp *get_timestamp(void)
{
struct timestamp *ts = NULL;
if (!(ts = dm_malloc(sizeof(*ts))))
return_NULL;
if (clock_gettime(CLOCK_MONOTONIC, &ts->t)) {
log_sys_error("clock_gettime", "get_timestamp");
return NULL;
}
return ts;
}
/* cmp_timestamp: Compare two timestamps
*
* Return: -1 if t1 is less than t2
* 0 if t1 is equal to t2
* 1 if t1 is greater than t2
*/
int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
{
if(t1->t.tv_sec < t2->t.tv_sec)
return -1;
if(t1->t.tv_sec > t2->t.tv_sec)
return 1;
if(t1->t.tv_nsec < t2->t.tv_nsec)
return -1;
if(t1->t.tv_nsec > t2->t.tv_nsec)
return 1;
return 0;
}
#else /* ! HAVE_REALTIME */
/*
* The !realtime section just uses gettimeofday and is therefore subject
* to ntp-type time warps - not sure if should allow that.
*/
#include <sys/time.h>
struct timestamp {
struct timeval t;
};
struct timestamp *get_timestamp(void)
{
struct timestamp *ts = NULL;
if (!(ts = dm_malloc(sizeof(*ts))))
return_NULL;
if (gettimeofday(&ts->t, NULL)) {
log_sys_error("gettimeofday", "get_timestamp");
return NULL;
}
return ts;
}
/* cmp_timestamp: Compare two timestamps
*
* Return: -1 if t1 is less than t2
* 0 if t1 is equal to t2
* 1 if t1 is greater than t2
*/
int cmp_timestamp(struct timestamp *t1, struct timestamp *t2)
{
if(t1->t.tv_sec < t2->t.tv_sec)
return -1;
if(t1->t.tv_sec > t2->t.tv_sec)
return 1;
if(t1->t.tv_usec < t2->t.tv_usec)
return -1;
if(t1->t.tv_usec > t2->t.tv_usec)
return 1;
return 0;
}
#endif /* HAVE_REALTIME */
void destroy_timestamp(struct timestamp *t)
{
dm_free(t);
}