#include <time.h>
#include <errno.h>
#include <stdint.h>
#include "syscall.h"
#include "libc.h"
#include "atomic.h"

static int sc_clock_gettime(clockid_t clk, struct timespec *ts)
{
	return __syscall(SYS_clock_gettime, clk, ts);
}

static int sc_gettimeofday(clockid_t clk, struct timespec *ts)
{
	if (clk != CLOCK_REALTIME)
		return EINVAL;
	__syscall(SYS_gettimeofday, ts, 0);
	ts->tv_nsec = (int)ts->tv_nsec * 1000;
	return 0;
}

void *__vdsosym(const char *, const char *);

int __clock_gettime(clockid_t clk, struct timespec *ts)
{
	static int (*cgt)(clockid_t, struct timespec *);
	if (!cgt) {
		int (*f)(clockid_t, struct timespec *) = 0;
#ifdef VDSO_CGT_SYM
		f = __vdsosym(VDSO_CGT_VER, VDSO_CGT_SYM);
#endif
		if (!f) {
			int r = sc_clock_gettime(clk, ts);
			if (r == -ENOSYS) {
				f = sc_gettimeofday;
			} else {
				a_cas_p(&cgt, 0, sc_clock_gettime);
				return r;
			}
		}
		a_cas_p(&cgt, 0, f);
	}
	return cgt(clk, ts);
}