time.c revision 4bed2e84a34b37259b85e5c092d51c122ef58c3c
#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/unexpect.h>
#include <isc/time.h>
/***
*** Intervals
***/
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
***/
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
isc_time_get(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);
}
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--;
}
}
/***
*** UNIX-only
***/
void
isc_time_fromtimeval(isc_time_t t, struct timeval *tv) {
/*
* Set 't' to the time given by 'ts'.
*/
REQUIRE(t != NULL && tv != NULL);
t->seconds = tv->tv_sec;
t->nanoseconds = tv->tv_usec * 1000;
}
void
isc_time_totimeval(isc_time_t t, struct timeval *tv) {
/*
* Convert 't' to a UNIX timeval.
*/
REQUIRE(t != NULL && tv != NULL);
tv->tv_sec = t->seconds;
tv->tv_usec = t->nanoseconds / 1000;
}
void
isc_time_fromtimespec(isc_time_t t, struct timespec *ts) {
/*
* Set 't' to the time given by 'ts'.
*/
REQUIRE(t != NULL && ts != NULL);
t->seconds = ts->tv_sec;
t->nanoseconds = ts->tv_nsec;
}
void
isc_time_totimespec(isc_time_t t, struct timespec *ts) {
/*
* Convert 't' to a UNIX timespec.
*/
REQUIRE(t != NULL && ts != NULL);
ts->tv_sec = t->seconds;
ts->tv_nsec = t->nanoseconds;
}