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time-util: add new call usec_shift_clock() for converting times between clocks

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We use that quite often, let's implement one clean version of it.
This commit is contained in:
Lennart Poettering
2017-06-22 20:52:23 +02:00
parent 54d8ef14d8
commit 1007ec60e6
3 changed files with 60 additions and 0 deletions
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src/test/test-time.c
+39
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@@ -331,6 +331,44 @@ static void test_dual_timestamp_deserialize(void) {
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;
@@ -348,6 +386,7 @@ int main(int argc, char *argv[]) {
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);