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/*
* getclock.c - Emulate Unix getclock(3) nanosecond interface for libntp/ntpd
*/
#include "config.h"
#include "ntp_unixtime.h"
#include "clockstuff.h"
#include "ntp_stdlib.h"
/*
* getclock() is in libntp. To use interpolation,
* ports/winnt/ntpd/nt_clockstuff.c overrides GetSystemTimeAsFileTime
* via the pointer get_sys_time_as_filetime.
*/
PGSTAFT get_sys_time_as_filetime;
PGSTAFT pGetSystemTimePreciseAsFileTime;
int
getclock(
int clktyp,
struct timespec *ts
)
{
union {
FILETIME ft;
ULONGLONG ull;
} uNow;
if (clktyp != TIMEOFDAY) {
TRACE(1, ("getclock() supports only TIMEOFDAY clktyp\n"));
errno = EINVAL;
return -1;
}
if (NULL == get_sys_time_as_filetime)
init_win_precise_time();
(*get_sys_time_as_filetime)(&uNow.ft);
/*
* Convert the hecto-nano second time to timespec format
*/
uNow.ull -= FILETIME_1970;
ts->tv_sec = (time_t)( uNow.ull / HECTONANOSECONDS);
ts->tv_nsec = (long)(( uNow.ull % HECTONANOSECONDS) * 100);
return 0;
}
void
init_win_precise_time(void)
{
HANDLE hDll;
FARPROC pfn;
hDll = LoadLibrary("kernel32");
pfn = GetProcAddress(hDll, "GetSystemTimePreciseAsFileTime");
if (NULL != pfn) {
pGetSystemTimePreciseAsFileTime = (PGSTAFT)pfn;
get_sys_time_as_filetime = pGetSystemTimePreciseAsFileTime;
} else {
get_sys_time_as_filetime = &GetSystemTimeAsFileTime;
}
}
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