src/test/test-time-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "random-util.h"
   4 #include "serialize.h"
   5 #include "string-util.h"
   6 #include "strv.h"
   7 #include "time-util.h"
   8
   9 static void test_parse_sec(void) {
  10         usec_t u;
  11
  12         log_info("/* %s */", __func__);
  13
  14         assert_se(parse_sec("5s", &u) >= 0);
  15         assert_se(u == 5 * USEC_PER_SEC);
  16         assert_se(parse_sec("5s500ms", &u) >= 0);
  17         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  18         assert_se(parse_sec(" 5s 500ms  ", &u) >= 0);
  19         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  20         assert_se(parse_sec(" 5.5s  ", &u) >= 0);
  21         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC);
  22         assert_se(parse_sec(" 5.5s 0.5ms ", &u) >= 0);
  23         assert_se(u == 5 * USEC_PER_SEC + 500 * USEC_PER_MSEC + 500);
  24         assert_se(parse_sec(" .22s ", &u) >= 0);
  25         assert_se(u == 220 * USEC_PER_MSEC);
  26         assert_se(parse_sec(" .50y ", &u) >= 0);
  27         assert_se(u == USEC_PER_YEAR / 2);
  28         assert_se(parse_sec("2.5", &u) >= 0);
  29         assert_se(u == 2500 * USEC_PER_MSEC);
  30         assert_se(parse_sec(".7", &u) >= 0);
  31         assert_se(u == 700 * USEC_PER_MSEC);
  32         assert_se(parse_sec("23us", &u) >= 0);
  33         assert_se(u == 23);
  34         assert_se(parse_sec("23µs", &u) >= 0);
  35         assert_se(u == 23);
  36         assert_se(parse_sec("infinity", &u) >= 0);
  37         assert_se(u == USEC_INFINITY);
  38         assert_se(parse_sec(" infinity ", &u) >= 0);
  39         assert_se(u == USEC_INFINITY);
  40         assert_se(parse_sec("+3.1s", &u) >= 0);
  41         assert_se(u == 3100 * USEC_PER_MSEC);
  42         assert_se(parse_sec("3.1s.2", &u) >= 0);
  43         assert_se(u == 3300 * USEC_PER_MSEC);
  44         assert_se(parse_sec("3.1 .2", &u) >= 0);
  45         assert_se(u == 3300 * USEC_PER_MSEC);
  46         assert_se(parse_sec("3.1 sec .2 sec", &u) >= 0);
  47         assert_se(u == 3300 * USEC_PER_MSEC);
  48         assert_se(parse_sec("3.1 sec 1.2 sec", &u) >= 0);
  49         assert_se(u == 4300 * USEC_PER_MSEC);
  50
  51         assert_se(parse_sec(" xyz ", &u) < 0);
  52         assert_se(parse_sec("", &u) < 0);
  53         assert_se(parse_sec(" . ", &u) < 0);
  54         assert_se(parse_sec(" 5. ", &u) < 0);
  55         assert_se(parse_sec(".s ", &u) < 0);
  56         assert_se(parse_sec("-5s ", &u) < 0);
  57         assert_se(parse_sec("-0.3s ", &u) < 0);
  58         assert_se(parse_sec("-0.0s ", &u) < 0);
  59         assert_se(parse_sec("-0.-0s ", &u) < 0);
  60         assert_se(parse_sec("0.-0s ", &u) < 0);
  61         assert_se(parse_sec("3.-0s ", &u) < 0);
  62         assert_se(parse_sec(" infinity .7", &u) < 0);
  63         assert_se(parse_sec(".3 infinity", &u) < 0);
  64         assert_se(parse_sec("3.+1s", &u) < 0);
  65         assert_se(parse_sec("3. 1s", &u) < 0);
  66         assert_se(parse_sec("3.s", &u) < 0);
  67         assert_se(parse_sec("12.34.56", &u) < 0);
  68         assert_se(parse_sec("12..34", &u) < 0);
  69         assert_se(parse_sec("..1234", &u) < 0);
  70         assert_se(parse_sec("1234..", &u) < 0);
  71 }
  72
  73 static void test_parse_sec_fix_0(void) {
  74         usec_t u;
  75
  76         log_info("/* %s */", __func__);
  77
  78         assert_se(parse_sec_fix_0("5s", &u) >= 0);
  79         assert_se(u == 5 * USEC_PER_SEC);
  80         assert_se(parse_sec_fix_0("0s", &u) >= 0);
  81         assert_se(u == USEC_INFINITY);
  82         assert_se(parse_sec_fix_0("0", &u) >= 0);
  83         assert_se(u == USEC_INFINITY);
  84         assert_se(parse_sec_fix_0(" 0", &u) >= 0);
  85         assert_se(u == USEC_INFINITY);
  86 }
  87
  88 static void test_parse_time(void) {
  89         usec_t u;
  90
  91         log_info("/* %s */", __func__);
  92
  93         assert_se(parse_time("5", &u, 1) >= 0);
  94         assert_se(u == 5);
  95
  96         assert_se(parse_time("5", &u, USEC_PER_MSEC) >= 0);
  97         assert_se(u == 5 * USEC_PER_MSEC);
  98
  99         assert_se(parse_time("5", &u, USEC_PER_SEC) >= 0);
 100         assert_se(u == 5 * USEC_PER_SEC);
 101
 102         assert_se(parse_time("5s", &u, 1) >= 0);
 103         assert_se(u == 5 * USEC_PER_SEC);
 104
 105         assert_se(parse_time("5s", &u, USEC_PER_SEC) >= 0);
 106         assert_se(u == 5 * USEC_PER_SEC);
 107
 108         assert_se(parse_time("5s", &u, USEC_PER_MSEC) >= 0);
 109         assert_se(u == 5 * USEC_PER_SEC);
 110
 111         assert_se(parse_time("11111111111111y", &u, 1) == -ERANGE);
 112         assert_se(parse_time("1.1111111111111y", &u, 1) >= 0);
 113 }
 114
 115 static void test_parse_nsec(void) {
 116         nsec_t u;
 117
 118         log_info("/* %s */", __func__);
 119
 120         assert_se(parse_nsec("5s", &u) >= 0);
 121         assert_se(u == 5 * NSEC_PER_SEC);
 122         assert_se(parse_nsec("5s500ms", &u) >= 0);
 123         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 124         assert_se(parse_nsec(" 5s 500ms  ", &u) >= 0);
 125         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 126         assert_se(parse_nsec(" 5.5s  ", &u) >= 0);
 127         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
 128         assert_se(parse_nsec(" 5.5s 0.5ms ", &u) >= 0);
 129         assert_se(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC + 500 * NSEC_PER_USEC);
 130         assert_se(parse_nsec(" .22s ", &u) >= 0);
 131         assert_se(u == 220 * NSEC_PER_MSEC);
 132         assert_se(parse_nsec(" .50y ", &u) >= 0);
 133         assert_se(u == NSEC_PER_YEAR / 2);
 134         assert_se(parse_nsec("2.5", &u) >= 0);
 135         assert_se(u == 2);
 136         assert_se(parse_nsec(".7", &u) >= 0);
 137         assert_se(u == 0);
 138         assert_se(parse_nsec("infinity", &u) >= 0);
 139         assert_se(u == NSEC_INFINITY);
 140         assert_se(parse_nsec(" infinity ", &u) >= 0);
 141         assert_se(u == NSEC_INFINITY);
 142         assert_se(parse_nsec("+3.1s", &u) >= 0);
 143         assert_se(u == 3100 * NSEC_PER_MSEC);
 144         assert_se(parse_nsec("3.1s.2", &u) >= 0);
 145         assert_se(u == 3100 * NSEC_PER_MSEC);
 146         assert_se(parse_nsec("3.1 .2s", &u) >= 0);
 147         assert_se(u == 200 * NSEC_PER_MSEC + 3);
 148         assert_se(parse_nsec("3.1 sec .2 sec", &u) >= 0);
 149         assert_se(u == 3300 * NSEC_PER_MSEC);
 150         assert_se(parse_nsec("3.1 sec 1.2 sec", &u) >= 0);
 151         assert_se(u == 4300 * NSEC_PER_MSEC);
 152
 153         assert_se(parse_nsec(" xyz ", &u) < 0);
 154         assert_se(parse_nsec("", &u) < 0);
 155         assert_se(parse_nsec(" . ", &u) < 0);
 156         assert_se(parse_nsec(" 5. ", &u) < 0);
 157         assert_se(parse_nsec(".s ", &u) < 0);
 158         assert_se(parse_nsec(" infinity .7", &u) < 0);
 159         assert_se(parse_nsec(".3 infinity", &u) < 0);
 160         assert_se(parse_nsec("-5s ", &u) < 0);
 161         assert_se(parse_nsec("-0.3s ", &u) < 0);
 162         assert_se(parse_nsec("-0.0s ", &u) < 0);
 163         assert_se(parse_nsec("-0.-0s ", &u) < 0);
 164         assert_se(parse_nsec("0.-0s ", &u) < 0);
 165         assert_se(parse_nsec("3.-0s ", &u) < 0);
 166         assert_se(parse_nsec(" infinity .7", &u) < 0);
 167         assert_se(parse_nsec(".3 infinity", &u) < 0);
 168         assert_se(parse_nsec("3.+1s", &u) < 0);
 169         assert_se(parse_nsec("3. 1s", &u) < 0);
 170         assert_se(parse_nsec("3.s", &u) < 0);
 171         assert_se(parse_nsec("12.34.56", &u) < 0);
 172         assert_se(parse_nsec("12..34", &u) < 0);
 173         assert_se(parse_nsec("..1234", &u) < 0);
 174         assert_se(parse_nsec("1234..", &u) < 0);
 175         assert_se(parse_nsec("1111111111111y", &u) == -ERANGE);
 176         assert_se(parse_nsec("1.111111111111y", &u) >= 0);
 177 }
 178
 179 static void test_format_timespan_one(usec_t x, usec_t accuracy) {
 180         char l[FORMAT_TIMESPAN_MAX];
 181         const char *t;
 182         usec_t y;
 183
 184         log_info(USEC_FMT"     (at accuracy "USEC_FMT")", x, accuracy);
 185
 186         assert_se(t = format_timespan(l, sizeof l, x, accuracy));
 187         log_info(" = <%s>", t);
 188
 189         assert_se(parse_sec(t, &y) >= 0);
 190         log_info(" = "USEC_FMT, y);
 191
 192         if (accuracy <= 0)
 193                 accuracy = 1;
 194
 195         assert_se(x / accuracy == y / accuracy);
 196 }
 197
 198 static void test_format_timespan(usec_t accuracy) {
 199         log_info("/* %s accuracy="USEC_FMT" */", __func__, accuracy);
 200
 201         test_format_timespan_one(0, accuracy);
 202         test_format_timespan_one(1, accuracy);
 203         test_format_timespan_one(1*USEC_PER_SEC, accuracy);
 204         test_format_timespan_one(999*USEC_PER_MSEC, accuracy);
 205         test_format_timespan_one(1234567, accuracy);
 206         test_format_timespan_one(12, accuracy);
 207         test_format_timespan_one(123, accuracy);
 208         test_format_timespan_one(1234, accuracy);
 209         test_format_timespan_one(12345, accuracy);
 210         test_format_timespan_one(123456, accuracy);
 211         test_format_timespan_one(1234567, accuracy);
 212         test_format_timespan_one(12345678, accuracy);
 213         test_format_timespan_one(1200000, accuracy);
 214         test_format_timespan_one(1230000, accuracy);
 215         test_format_timespan_one(1234000, accuracy);
 216         test_format_timespan_one(1234500, accuracy);
 217         test_format_timespan_one(1234560, accuracy);
 218         test_format_timespan_one(1234567, accuracy);
 219         test_format_timespan_one(986087, accuracy);
 220         test_format_timespan_one(500 * USEC_PER_MSEC, accuracy);
 221         test_format_timespan_one(9*USEC_PER_YEAR/5 - 23, accuracy);
 222         test_format_timespan_one(USEC_INFINITY, accuracy);
 223 }
 224
 225 static void test_timezone_is_valid(void) {
 226         log_info("/* %s */", __func__);
 227
 228         assert_se(timezone_is_valid("Europe/Berlin", LOG_ERR));
 229         assert_se(timezone_is_valid("Australia/Sydney", LOG_ERR));
 230         assert_se(!timezone_is_valid("Europe/Do not exist", LOG_ERR));
 231 }
 232
 233 static void test_get_timezones(void) {
 234         _cleanup_strv_free_ char **zones = NULL;
 235         int r;
 236         char **zone;
 237
 238         log_info("/* %s */", __func__);
 239
 240         r = get_timezones(&zones);
 241         assert_se(r == 0);
 242
 243         STRV_FOREACH(zone, zones)
 244                 assert_se(timezone_is_valid(*zone, LOG_ERR));
 245 }
 246
 247 static void test_usec_add(void) {
 248         log_info("/* %s */", __func__);
 249
 250         assert_se(usec_add(0, 0) == 0);
 251         assert_se(usec_add(1, 4) == 5);
 252         assert_se(usec_add(USEC_INFINITY, 5) == USEC_INFINITY);
 253         assert_se(usec_add(5, USEC_INFINITY) == USEC_INFINITY);
 254         assert_se(usec_add(USEC_INFINITY-5, 2) == USEC_INFINITY-3);
 255         assert_se(usec_add(USEC_INFINITY-2, 2) == USEC_INFINITY);
 256         assert_se(usec_add(USEC_INFINITY-1, 2) == USEC_INFINITY);
 257         assert_se(usec_add(USEC_INFINITY, 2) == USEC_INFINITY);
 258 }
 259
 260 static void test_usec_sub_unsigned(void) {
 261         log_info("/* %s */", __func__);
 262
 263         assert_se(usec_sub_unsigned(0, 0) == 0);
 264         assert_se(usec_sub_unsigned(0, 2) == 0);
 265         assert_se(usec_sub_unsigned(0, USEC_INFINITY) == 0);
 266         assert_se(usec_sub_unsigned(1, 0) == 1);
 267         assert_se(usec_sub_unsigned(1, 1) == 0);
 268         assert_se(usec_sub_unsigned(1, 2) == 0);
 269         assert_se(usec_sub_unsigned(1, 3) == 0);
 270         assert_se(usec_sub_unsigned(1, USEC_INFINITY) == 0);
 271         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 0) == USEC_INFINITY-1);
 272         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 1) == USEC_INFINITY-2);
 273         assert_se(usec_sub_unsigned(USEC_INFINITY-1, 2) == USEC_INFINITY-3);
 274         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-2) == 1);
 275         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY-1) == 0);
 276         assert_se(usec_sub_unsigned(USEC_INFINITY-1, USEC_INFINITY) == 0);
 277         assert_se(usec_sub_unsigned(USEC_INFINITY, 0) == USEC_INFINITY);
 278         assert_se(usec_sub_unsigned(USEC_INFINITY, 1) == USEC_INFINITY);
 279         assert_se(usec_sub_unsigned(USEC_INFINITY, 2) == USEC_INFINITY);
 280         assert_se(usec_sub_unsigned(USEC_INFINITY, USEC_INFINITY) == USEC_INFINITY);
 281 }
 282
 283 static void test_usec_sub_signed(void) {
 284         log_info("/* %s */", __func__);
 285
 286         assert_se(usec_sub_signed(0, 0) == 0);
 287         assert_se(usec_sub_signed(4, 1) == 3);
 288         assert_se(usec_sub_signed(4, 4) == 0);
 289         assert_se(usec_sub_signed(4, 5) == 0);
 290         assert_se(usec_sub_signed(USEC_INFINITY-3, -3) == USEC_INFINITY);
 291         assert_se(usec_sub_signed(USEC_INFINITY-3, -4) == USEC_INFINITY);
 292         assert_se(usec_sub_signed(USEC_INFINITY-3, -5) == USEC_INFINITY);
 293         assert_se(usec_sub_signed(USEC_INFINITY, 5) == USEC_INFINITY);
 294 }
 295
 296 static void test_format_timestamp(void) {
 297         unsigned i;
 298
 299         log_info("/* %s */", __func__);
 300
 301         for (i = 0; i < 100; i++) {
 302                 char buf[MAX(FORMAT_TIMESTAMP_MAX, FORMAT_TIMESPAN_MAX)];
 303                 usec_t x, y;
 304
 305                 random_bytes(&x, sizeof(x));
 306                 x = x % (2147483600 * USEC_PER_SEC) + 1;
 307
 308                 assert_se(format_timestamp(buf, sizeof(buf), x));
 309                 log_info("%s", buf);
 310                 assert_se(parse_timestamp(buf, &y) >= 0);
 311                 assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
 312
 313                 assert_se(format_timestamp_utc(buf, sizeof(buf), x));
 314                 log_info("%s", buf);
 315                 assert_se(parse_timestamp(buf, &y) >= 0);
 316                 assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
 317
 318                 assert_se(format_timestamp_us(buf, sizeof(buf), x));
 319                 log_info("%s", buf);
 320                 assert_se(parse_timestamp(buf, &y) >= 0);
 321                 assert_se(x == y);
 322
 323                 assert_se(format_timestamp_us_utc(buf, sizeof(buf), x));
 324                 log_info("%s", buf);
 325                 assert_se(parse_timestamp(buf, &y) >= 0);
 326                 assert_se(x == y);
 327
 328                 assert_se(format_timestamp_relative(buf, sizeof(buf), x));
 329                 log_info("%s", buf);
 330                 assert_se(parse_timestamp(buf, &y) >= 0);
 331
 332                 /* The two calls above will run with a slightly different local time. Make sure we are in the same
 333                  * range however, but give enough leeway that this is unlikely to explode. And of course,
 334                  * format_timestamp_relative() scales the accuracy with the distance from the current time up to one
 335                  * month, cover for that too. */
 336                 assert_se(y > x ? y - x : x - y <= USEC_PER_MONTH + USEC_PER_DAY);
 337         }
 338 }
 339
 340 static void test_format_timestamp_utc_one(usec_t val, const char *result) {
 341         char buf[FORMAT_TIMESTAMP_MAX];
 342         const char *t;
 343
 344         t = format_timestamp_utc(buf, sizeof(buf), val);
 345         assert_se(streq_ptr(t, result));
 346 }
 347
 348 static void test_format_timestamp_utc(void) {
 349         log_info("/* %s */", __func__);
 350
 351         test_format_timestamp_utc_one(0, NULL);
 352         test_format_timestamp_utc_one(1, "Thu 1970-01-01 00:00:00 UTC");
 353         test_format_timestamp_utc_one(USEC_PER_SEC, "Thu 1970-01-01 00:00:01 UTC");
 354
 355 #if SIZEOF_TIME_T == 8
 356         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX, "Thu 9999-12-30 23:59:59 UTC");
 357         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX + 1, "--- XXXX-XX-XX XX:XX:XX");
 358 #elif SIZEOF_TIME_T == 4
 359         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX, "Tue 2038-01-19 03:14:07 UTC");
 360         test_format_timestamp_utc_one(USEC_TIMESTAMP_FORMATTABLE_MAX + 1, "--- XXXX-XX-XX XX:XX:XX");
 361 #endif
 362
 363         test_format_timestamp_utc_one(USEC_INFINITY, NULL);
 364 }
 365
 366 static void test_deserialize_dual_timestamp(void) {
 367         int r;
 368         dual_timestamp t;
 369
 370         log_info("/* %s */", __func__);
 371
 372         r = deserialize_dual_timestamp("1234 5678", &t);
 373         assert_se(r == 0);
 374         assert_se(t.realtime == 1234);
 375         assert_se(t.monotonic == 5678);
 376
 377         r = deserialize_dual_timestamp("1234x 5678", &t);
 378         assert_se(r == -EINVAL);
 379
 380         r = deserialize_dual_timestamp("1234 5678y", &t);
 381         assert_se(r == -EINVAL);
 382
 383         r = deserialize_dual_timestamp("-1234 5678", &t);
 384         assert_se(r == -EINVAL);
 385
 386         r = deserialize_dual_timestamp("1234 -5678", &t);
 387         assert_se(r == -EINVAL);
 388
 389         /* Check that output wasn't modified. */
 390         assert_se(t.realtime == 1234);
 391         assert_se(t.monotonic == 5678);
 392
 393         r = deserialize_dual_timestamp("+123 567", &t);
 394         assert_se(r == 0);
 395         assert_se(t.realtime == 123);
 396         assert_se(t.monotonic == 567);
 397
 398         /* Check that we get "infinity" on overflow. */
 399         r = deserialize_dual_timestamp("18446744073709551617 0", &t);
 400         assert_se(r == 0);
 401         assert_se(t.realtime == USEC_INFINITY);
 402         assert_se(t.monotonic == 0);
 403 }
 404
 405 static void assert_similar(usec_t a, usec_t b) {
 406         usec_t d;
 407
 408         if (a > b)
 409                 d = a - b;
 410         else
 411                 d = b - a;
 412
 413         assert(d < 10*USEC_PER_SEC);
 414 }
 415
 416 static void test_usec_shift_clock(void) {
 417         usec_t rt, mn, bt;
 418
 419         log_info("/* %s */", __func__);
 420
 421         rt = now(CLOCK_REALTIME);
 422         mn = now(CLOCK_MONOTONIC);
 423         bt = now(clock_boottime_or_monotonic());
 424
 425         assert_se(usec_shift_clock(USEC_INFINITY, CLOCK_REALTIME, CLOCK_MONOTONIC) == USEC_INFINITY);
 426
 427         assert_similar(usec_shift_clock(rt + USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_MONOTONIC), mn + USEC_PER_HOUR);
 428         assert_similar(usec_shift_clock(rt + 2*USEC_PER_HOUR, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt + 2*USEC_PER_HOUR);
 429         assert_se(usec_shift_clock(rt + 3*USEC_PER_HOUR, CLOCK_REALTIME, CLOCK_REALTIME_ALARM) == rt + 3*USEC_PER_HOUR);
 430
 431         assert_similar(usec_shift_clock(mn + 4*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_REALTIME_ALARM), rt + 4*USEC_PER_HOUR);
 432         assert_similar(usec_shift_clock(mn + 5*USEC_PER_HOUR, CLOCK_MONOTONIC, clock_boottime_or_monotonic()), bt + 5*USEC_PER_HOUR);
 433         assert_se(usec_shift_clock(mn + 6*USEC_PER_HOUR, CLOCK_MONOTONIC, CLOCK_MONOTONIC) == mn + 6*USEC_PER_HOUR);
 434
 435         assert_similar(usec_shift_clock(bt + 7*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_MONOTONIC), mn + 7*USEC_PER_HOUR);
 436         assert_similar(usec_shift_clock(bt + 8*USEC_PER_HOUR, clock_boottime_or_monotonic(), CLOCK_REALTIME_ALARM), rt + 8*USEC_PER_HOUR);
 437         assert_se(usec_shift_clock(bt + 9*USEC_PER_HOUR, clock_boottime_or_monotonic(), clock_boottime_or_monotonic()) == bt + 9*USEC_PER_HOUR);
 438
 439         if (mn > USEC_PER_MINUTE) {
 440                 assert_similar(usec_shift_clock(rt - 30 * USEC_PER_SEC, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC), mn - 30 * USEC_PER_SEC);
 441                 assert_similar(usec_shift_clock(rt - 50 * USEC_PER_SEC, CLOCK_REALTIME, clock_boottime_or_monotonic()), bt - 50 * USEC_PER_SEC);
 442         }
 443 }
 444
 445 static void test_in_utc_timezone(void) {
 446         log_info("/* %s */", __func__);
 447
 448         assert_se(setenv("TZ", ":UTC", 1) >= 0);
 449         assert_se(in_utc_timezone());
 450         assert_se(streq(tzname[0], "UTC"));
 451         assert_se(streq(tzname[1], "UTC"));
 452         assert_se(timezone == 0);
 453         assert_se(daylight == 0);
 454
 455         assert_se(setenv("TZ", "Europe/Berlin", 1) >= 0);
 456         assert_se(!in_utc_timezone());
 457         assert_se(streq(tzname[0], "CET"));
 458         assert_se(streq(tzname[1], "CEST"));
 459
 460         assert_se(unsetenv("TZ") >= 0);
 461 }
 462
 463 int main(int argc, char *argv[]) {
 464         uintmax_t x;
 465
 466         log_info("realtime=" USEC_FMT "\n"
 467                  "monotonic=" USEC_FMT "\n"
 468                  "boottime=" USEC_FMT "\n",
 469                  now(CLOCK_REALTIME),
 470                  now(CLOCK_MONOTONIC),
 471                  now(clock_boottime_or_monotonic()));
 472
 473         test_parse_sec();
 474         test_parse_sec_fix_0();
 475         test_parse_time();
 476         test_parse_nsec();
 477         test_format_timespan(1);
 478         test_format_timespan(USEC_PER_MSEC);
 479         test_format_timespan(USEC_PER_SEC);
 480         test_timezone_is_valid();
 481         test_get_timezones();
 482         test_usec_add();
 483         test_usec_sub_signed();
 484         test_usec_sub_unsigned();
 485         test_format_timestamp();
 486         test_format_timestamp_utc();
 487         test_deserialize_dual_timestamp();
 488         test_usec_shift_clock();
 489         test_in_utc_timezone();
 490
 491         /* Ensure time_t is signed */
 492         assert_cc((time_t) -1 < (time_t) 1);
 493
 494         /* Ensure TIME_T_MAX works correctly */
 495         x = (uintmax_t) TIME_T_MAX;
 496         x++;
 497         assert((time_t) x < 0);
 498
 499         return 0;
 500 }