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xtime.c
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xtime.c
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#include <time.h>
#include <unistd.h>
#include "xtypes.h"
#include "xtime.h"
utsa_t
utsa_createnew()
{
utsa_t result;
struct timespec ts_high; // high-precision nonsence clock
struct timespec ts_low; // low-precision adjusted clock
clock_gettime(CLOCK_MONOTONIC_RAW, &ts_high);
clock_gettime(CLOCK_REALTIME, &ts_low);
result.stamp.secs = (i64)ts_low.tv_sec - NEWEPOCH;
result.stamp.frac = (u64)ts_low.tv_nsec;
result.stamp.frac <<= 32;
result.stamp.frac /= 1000000000;
result.stamp.frac <<= 32; // nanoseconds to 64-pow fracs
result.adjust.secs = (i64)ts_high.tv_sec;
result.adjust.frac = (u64)ts_high.tv_nsec;
result.adjust.frac <<= 32;
result.adjust.frac /= 1000000000;
result.adjust.frac <<= 32; // nanoseconds to 64-pow fracs
uts_sub(&result.adjust, &result.stamp, &result.adjust);
return result;
}
utsa_t *
utsa_get(
utsa_t *astamp
)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
astamp.stamp.secs = (i64)ts.tv_sec;
astamp.stamp.frac = (u64)ts.tv_nsec;
astamp.stamp.frac <<= 32;
astamp.stamp.frac /= 1000000000;
astamp.stamp.frac <<= 32;
uts_add(astamp.stamp, astamp.stamp, astamp.adjust);
return astamp;
}
struct tm *
uts_gmtime_r(
uts_t *stamp,
struct tm *result
)
{
u64 usecs = uts->frac;
usecs >>= 32;
usecs *= 1000000000;
usecs >>= 32;
result->tm_isdst = (int)usecs;
result->tm_sec = (int)(stamp->secs % 60);
// ...
// TODO
return result;
}
uts_t
uts_mktime(
struct tm *tm
)
{
uts_t result;
result.frac = (u64)tm.tm_isdst;
result.frac <<= 32;
result.frac /= 1000000000;
result.frac <<= 32; // nanoseconds to 64-pow fracs
result.secs = tm->tm_sec;
// ...
// TODO
return result;
}
uts_t *
uts_sub(
uts_t *result, // = a - b
uts_t *a,
uts_t *b
)
{
if (a->frac >= b->frac)
result->secs = a->secs - b->secs;
else
result->secs = a->secs - b->secs - 1;
result->frac = a->frac - b->frac;
return result;
}
uts_t *
uts_add(
uts_t *result, // = a + b
uts_t *a,
uts_t *b
)
{
u64 fracsum = a->frac + b->frac;
if (a->frac <= fracsum)
result->secs = a->secs + b->secs;
else
result->secs = a->secs + b->secs + 1;
result->frac = fracsum;
return result;
}
void
uts_sleep(
uts_t *uts
)
{
u64 usecs = uts->frac;
usecs >>= 32;
usecs *= 1000000;
usecs >>= 32;
if (uts->secs < 0)
return;
sleep(uts->secs);
usleep(usecs);
}