return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
}
+
+usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to) {
+ usec_t a, b;
+
+ if (x == USEC_INFINITY)
+ return USEC_INFINITY;
+ if (map_clock_id(from) == map_clock_id(to))
+ return x;
+
+ a = now(from);
+ b = now(to);
+
+ if (x > a)
+ /* x lies in the future */
+ return usec_add(b, usec_sub_unsigned(x, a));
+ else
+ /* x lies in the past */
+ return usec_sub_unsigned(b, usec_sub_unsigned(a, x));
+}
bool clock_supported(clockid_t clock);
clockid_t clock_boottime_or_monotonic(void);
+usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
+
#define xstrftime(buf, fmt, tm) \
assert_message_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0, \
"xstrftime: " #buf "[] must be big enough")
assert_se(t.monotonic == 0);
}
+static void assert_similar(usec_t a, usec_t b) {
+ usec_t d;
+
+ if (a > b)
+ d = a - b;
+ else
+ d = b - a;
+
+ assert(d < 10*USEC_PER_SEC);
+}
+
+static void test_usec_shift_clock(void) {
+ usec_t rt, mn, bt;
+
+ rt = now(CLOCK_REALTIME);
+ mn = now(CLOCK_MONOTONIC);
+ bt = now(clock_boottime_or_monotonic());
+
+ assert_se(usec_shift_clock(USEC_INFINITY, CLOCK_REALTIME, CLOCK_MONOTONIC) == USEC_INFINITY);
+
+ assert_similar(usec_shift_clock(rt + USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_MONOTONIC), mn + USEC_PER_HOUR);
+ assert_similar(usec_shift_clock(rt + 2*USEC_PER_HOUR, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt + 2*USEC_PER_HOUR);
+ assert_se(usec_shift_clock(rt + 3*USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_REALTIME_ALARM) == rt + 3*USEC_PER_HOUR);
+
+ assert_similar(usec_shift_clock(mn + 4*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_REALTIME_ALARM), rt + 4*USEC_PER_HOUR);
+ assert_similar(usec_shift_clock(mn + 5*USEC_PER_HOUR, CLOCK_MONOTONIC, clock_boottime_or_monotonic()), bt + 5*USEC_PER_HOUR);
+ assert_se(usec_shift_clock(mn + 6*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_MONOTONIC) == mn + 6*USEC_PER_HOUR);
+
+ assert_similar(usec_shift_clock(bt + 7*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_MONOTONIC), mn + 7*USEC_PER_HOUR);
+ assert_similar(usec_shift_clock(bt + 8*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_REALTIME_ALARM), rt + 8*USEC_PER_HOUR);
+ assert_se(usec_shift_clock(bt + 9*USEC_PER_HOUR, clock_boottime_or_monotonic(), clock_boottime_or_monotonic()) == bt + 9*USEC_PER_HOUR);
+
+ if (mn > USEC_PER_MINUTE) {
+ assert_similar(usec_shift_clock(rt - 30 * USEC_PER_SEC, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC), mn - 30 * USEC_PER_SEC);
+ assert_similar(usec_shift_clock(rt - 50 * USEC_PER_SEC, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt - 50 * USEC_PER_SEC);
+ }
+}
+
int main(int argc, char *argv[]) {
uintmax_t x;
test_format_timestamp();
test_format_timestamp_utc();
test_dual_timestamp_deserialize();
+ test_usec_shift_clock();
/* Ensure time_t is signed */
assert_cc((time_t) -1 < (time_t) 1);