time.c revision 4ad9b25e6ddf948ffb3b8198c5540d251f26c52e
/*
* Copyright (C) 1998, 1999 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/time.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/time.h>
/***
*** Intervals
***/
static isc_interval_t zero_interval = { 0, 0 };
isc_interval_t *isc_interval_zero = &zero_interval;
void
isc_interval_set(isc_interval_t *i,
unsigned int seconds, unsigned int nanoseconds) {
/*
* Set 'i' to a value representing an interval of 'seconds' seconds
* and 'nanoseconds' nanoseconds, suitable for use in isc_time_add()
* and isc_time_subtract().
*/
REQUIRE(i != NULL);
REQUIRE(nanoseconds < 1000000000);
i->seconds = seconds;
i->nanoseconds = nanoseconds;
}
isc_boolean_t
isc_interval_iszero(isc_interval_t *i) {
/*
* Returns ISC_TRUE iff. 'i' is the zero interval.
*/
REQUIRE(i != NULL);
if (i->seconds == 0 && i->nanoseconds == 0)
return (ISC_TRUE);
return (ISC_FALSE);
}
/***
*** Absolute Times
***/
static isc_time_t epoch = { 0, 0 };
isc_time_t *isc_time_epoch = &epoch;
void
isc_time_settoepoch(isc_time_t *t) {
/*
* Set 't' to the time of the epoch.
*/
REQUIRE(t != NULL);
t->seconds = 0;
t->nanoseconds = 0;
}
isc_boolean_t
isc_time_isepoch(isc_time_t *t) {
/*
* Returns ISC_TRUE iff. 't' is the epoch ("time zero").
*/
REQUIRE(t != NULL);
if (t->seconds == 0 && t->nanoseconds == 0)
return (ISC_TRUE);
return (ISC_FALSE);
}
isc_result_t
isc_time_now(isc_time_t *t) {
struct timeval tv;
/*
* Set *t to the current absolute time.
*/
REQUIRE(t != NULL);
if (gettimeofday(&tv, NULL) == -1) {
UNEXPECTED_ERROR(__FILE__, __LINE__, strerror(errno));
return (ISC_R_UNEXPECTED);
}
t->seconds = tv.tv_sec;
t->nanoseconds = tv.tv_usec * 1000;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_time_nowplusinterval(isc_time_t *t, isc_interval_t *i) {
struct timeval tv;
/*
* Set *t to the current absolute time + i.
*/
REQUIRE(t != NULL);
REQUIRE(i != NULL);
if (gettimeofday(&tv, NULL) == -1) {
UNEXPECTED_ERROR(__FILE__, __LINE__, strerror(errno));
return (ISC_R_UNEXPECTED);
}
t->seconds = tv.tv_sec + i->seconds;
t->nanoseconds = tv.tv_usec * 1000 + i->nanoseconds;
if (t->nanoseconds > 1000000000) {
t->seconds++;
t->nanoseconds -= 1000000000;
}
return (ISC_R_SUCCESS);
}
int
isc_time_compare(isc_time_t *t1, isc_time_t *t2) {
/*
* Compare the times referenced by 't1' and 't2'
*/
REQUIRE(t1 != NULL && t2 != NULL);
if (t1->seconds < t2->seconds)
return (-1);
if (t1->seconds > t2->seconds)
return (1);
if (t1->nanoseconds < t2->nanoseconds)
return (-1);
if (t1->nanoseconds > t2->nanoseconds)
return (1);
return (0);
}
void
isc_time_add(isc_time_t *t, isc_interval_t *i, isc_time_t *result)
{
/*
* Add 't' to 'i', storing the result in 'result'.
*/
REQUIRE(t != NULL && i != NULL && result != NULL);
result->seconds = t->seconds + i->seconds;
result->nanoseconds = t->nanoseconds + i->nanoseconds;
if (result->nanoseconds > 1000000000) {
result->seconds++;
result->nanoseconds -= 1000000000;
}
}
void
isc_time_subtract(isc_time_t *t, isc_interval_t *i, isc_time_t *result) {
/*
* Subtract 'i' from 't', storing the result in 'result'.
*/
REQUIRE(t != NULL && i != NULL && result != NULL);
result->seconds = t->seconds - i->seconds;
if (t->nanoseconds >= i->nanoseconds)
result->nanoseconds = t->nanoseconds - i->nanoseconds;
else {
result->nanoseconds = 1000000000 - i->nanoseconds +
t->nanoseconds;
result->seconds--;
}
}
isc_uint64_t
isc_time_microdiff(isc_time_t *t1, isc_time_t *t2) {
isc_uint64_t i1, i2, i3;
REQUIRE(t1 != NULL && t2 != NULL);
i1 = t1->seconds * 1000000000 + t1->nanoseconds;
i2 = t2->seconds * 1000000000 + t2->nanoseconds;
if (i1 <= i2)
return (0);
i3 = i1 - i2;
/*
* Convert to microseconds.
*/
i3 = (i1 - i2) / 10000;
return (i3);
}