src/libsystemd/sd-event/test-event.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <sys/wait.h>
   4
   5 #include "sd-event.h"
   6
   7 #include "alloc-util.h"
   8 #include "fd-util.h"
   9 #include "fs-util.h"
  10 #include "log.h"
  11 #include "macro.h"
  12 #include "missing_syscall.h"
  13 #include "parse-util.h"
  14 #include "path-util.h"
  15 #include "process-util.h"
  16 #include "rm-rf.h"
  17 #include "signal-util.h"
  18 #include "stdio-util.h"
  19 #include "string-util.h"
  20 #include "tests.h"
  21 #include "tmpfile-util.h"
  22 #include "util.h"
  23
  24 static int prepare_handler(sd_event_source *s, void *userdata) {
  25         log_info("preparing %c", PTR_TO_INT(userdata));
  26         return 1;
  27 }
  28
  29 static bool got_a, got_b, got_c, got_unref;
  30 static unsigned got_d;
  31
  32 static int unref_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
  33         sd_event_source_unref(s);
  34         got_unref = true;
  35         return 0;
  36 }
  37
  38 static int io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
  39
  40         log_info("got IO on %c", PTR_TO_INT(userdata));
  41
  42         if (userdata == INT_TO_PTR('a')) {
  43                 assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
  44                 assert_se(!got_a);
  45                 got_a = true;
  46         } else if (userdata == INT_TO_PTR('b')) {
  47                 assert_se(!got_b);
  48                 got_b = true;
  49         } else if (userdata == INT_TO_PTR('d')) {
  50                 got_d++;
  51                 if (got_d < 2)
  52                         assert_se(sd_event_source_set_enabled(s, SD_EVENT_ONESHOT) >= 0);
  53                 else
  54                         assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
  55         } else
  56                 assert_not_reached("Yuck!");
  57
  58         return 1;
  59 }
  60
  61 static int child_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
  62
  63         assert_se(s);
  64         assert_se(si);
  65
  66         assert_se(si->si_uid == getuid());
  67         assert_se(si->si_signo == SIGCHLD);
  68         assert_se(si->si_code == CLD_EXITED);
  69         assert_se(si->si_status == 78);
  70
  71         log_info("got child on %c", PTR_TO_INT(userdata));
  72
  73         assert_se(userdata == INT_TO_PTR('f'));
  74
  75         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
  76         sd_event_source_unref(s);
  77
  78         return 1;
  79 }
  80
  81 static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  82         sd_event_source *p = NULL;
  83         pid_t pid;
  84         siginfo_t plain_si;
  85
  86         assert_se(s);
  87         assert_se(si);
  88
  89         log_info("got signal on %c", PTR_TO_INT(userdata));
  90
  91         assert_se(userdata == INT_TO_PTR('e'));
  92
  93         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGUSR2, -1) >= 0);
  94
  95         pid = fork();
  96         assert_se(pid >= 0);
  97
  98         if (pid == 0) {
  99                 sigset_t ss;
 100
 101                 assert_se(sigemptyset(&ss) >= 0);
 102                 assert_se(sigaddset(&ss, SIGUSR2) >= 0);
 103
 104                 zero(plain_si);
 105                 assert_se(sigwaitinfo(&ss, &plain_si) >= 0);
 106
 107                 assert_se(plain_si.si_signo == SIGUSR2);
 108                 assert_se(plain_si.si_value.sival_int == 4711);
 109
 110                 _exit(78);
 111         }
 112
 113         assert_se(sd_event_add_child(sd_event_source_get_event(s), &p, pid, WEXITED, child_handler, INT_TO_PTR('f')) >= 0);
 114         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 115         assert_se(sd_event_source_set_child_process_own(p, true) >= 0);
 116
 117         /* We can't use structured initialization here, since the structure contains various unions and these
 118          * fields lie in overlapping (carefully aligned) unions that LLVM is allergic to allow assignments
 119          * to */
 120         zero(plain_si);
 121         plain_si.si_signo = SIGUSR2;
 122         plain_si.si_code = SI_QUEUE;
 123         plain_si.si_pid = getpid();
 124         plain_si.si_uid = getuid();
 125         plain_si.si_value.sival_int = 4711;
 126
 127         assert_se(sd_event_source_send_child_signal(p, SIGUSR2, &plain_si, 0) >= 0);
 128
 129         sd_event_source_unref(s);
 130
 131         return 1;
 132 }
 133
 134 static int defer_handler(sd_event_source *s, void *userdata) {
 135         sd_event_source *p = NULL;
 136
 137         assert_se(s);
 138
 139         log_info("got defer on %c", PTR_TO_INT(userdata));
 140
 141         assert_se(userdata == INT_TO_PTR('d'));
 142
 143         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGUSR1, -1) >= 0);
 144
 145         assert_se(sd_event_add_signal(sd_event_source_get_event(s), &p, SIGUSR1, signal_handler, INT_TO_PTR('e')) >= 0);
 146         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 147         raise(SIGUSR1);
 148
 149         sd_event_source_unref(s);
 150
 151         return 1;
 152 }
 153
 154 static bool do_quit;
 155
 156 static int time_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 157         log_info("got timer on %c", PTR_TO_INT(userdata));
 158
 159         if (userdata == INT_TO_PTR('c')) {
 160
 161                 if (do_quit) {
 162                         sd_event_source *p;
 163
 164                         assert_se(sd_event_add_defer(sd_event_source_get_event(s), &p, defer_handler, INT_TO_PTR('d')) >= 0);
 165                         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 166                 } else {
 167                         assert_se(!got_c);
 168                         got_c = true;
 169                 }
 170         } else
 171                 assert_not_reached("Huh?");
 172
 173         return 2;
 174 }
 175
 176 static bool got_exit = false;
 177
 178 static int exit_handler(sd_event_source *s, void *userdata) {
 179         log_info("got quit handler on %c", PTR_TO_INT(userdata));
 180
 181         got_exit = true;
 182
 183         return 3;
 184 }
 185
 186 static bool got_post = false;
 187
 188 static int post_handler(sd_event_source *s, void *userdata) {
 189         log_info("got post handler");
 190
 191         got_post = true;
 192
 193         return 2;
 194 }
 195
 196 static void test_basic(bool with_pidfd) {
 197         sd_event *e = NULL;
 198         sd_event_source *w = NULL, *x = NULL, *y = NULL, *z = NULL, *q = NULL, *t = NULL;
 199         static const char ch = 'x';
 200         int a[2] = { -1, -1 }, b[2] = { -1, -1}, d[2] = { -1, -1}, k[2] = { -1, -1 };
 201         uint64_t event_now;
 202         int64_t priority;
 203
 204         log_info("/* %s(pidfd=%s) */", __func__, yes_no(with_pidfd));
 205
 206         assert_se(setenv("SYSTEMD_PIDFD", yes_no(with_pidfd), 1) >= 0);
 207
 208         assert_se(pipe(a) >= 0);
 209         assert_se(pipe(b) >= 0);
 210         assert_se(pipe(d) >= 0);
 211         assert_se(pipe(k) >= 0);
 212
 213         assert_se(sd_event_default(&e) >= 0);
 214         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
 215
 216         assert_se(sd_event_set_watchdog(e, true) >= 0);
 217
 218         /* Test whether we cleanly can destroy an io event source from its own handler */
 219         got_unref = false;
 220         assert_se(sd_event_add_io(e, &t, k[0], EPOLLIN, unref_handler, NULL) >= 0);
 221         assert_se(write(k[1], &ch, 1) == 1);
 222         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 223         assert_se(got_unref);
 224
 225         got_a = false, got_b = false, got_c = false, got_d = 0;
 226
 227         /* Add a oneshot handler, trigger it, reenable it, and trigger
 228          * it again. */
 229         assert_se(sd_event_add_io(e, &w, d[0], EPOLLIN, io_handler, INT_TO_PTR('d')) >= 0);
 230         assert_se(sd_event_source_set_enabled(w, SD_EVENT_ONESHOT) >= 0);
 231         assert_se(write(d[1], &ch, 1) >= 0);
 232         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 233         assert_se(got_d == 1);
 234         assert_se(write(d[1], &ch, 1) >= 0);
 235         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 236         assert_se(got_d == 2);
 237
 238         assert_se(sd_event_add_io(e, &x, a[0], EPOLLIN, io_handler, INT_TO_PTR('a')) >= 0);
 239         assert_se(sd_event_add_io(e, &y, b[0], EPOLLIN, io_handler, INT_TO_PTR('b')) >= 0);
 240
 241         do_quit = false;
 242         assert_se(sd_event_add_time(e, &z, CLOCK_MONOTONIC, 0, 0, time_handler, INT_TO_PTR('c')) >= 0);
 243         assert_se(sd_event_add_exit(e, &q, exit_handler, INT_TO_PTR('g')) >= 0);
 244
 245         assert_se(sd_event_source_set_priority(x, 99) >= 0);
 246         assert_se(sd_event_source_get_priority(x, &priority) >= 0);
 247         assert_se(priority == 99);
 248         assert_se(sd_event_source_set_enabled(y, SD_EVENT_ONESHOT) >= 0);
 249         assert_se(sd_event_source_set_prepare(x, prepare_handler) >= 0);
 250         assert_se(sd_event_source_set_priority(z, 50) >= 0);
 251         assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
 252         assert_se(sd_event_source_set_prepare(z, prepare_handler) >= 0);
 253
 254         /* Test for floating event sources */
 255         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+1, -1) >= 0);
 256         assert_se(sd_event_add_signal(e, NULL, SIGRTMIN+1, NULL, NULL) >= 0);
 257
 258         assert_se(write(a[1], &ch, 1) >= 0);
 259         assert_se(write(b[1], &ch, 1) >= 0);
 260
 261         assert_se(!got_a && !got_b && !got_c);
 262
 263         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 264
 265         assert_se(!got_a && got_b && !got_c);
 266
 267         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 268
 269         assert_se(!got_a && got_b && got_c);
 270
 271         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 272
 273         assert_se(got_a && got_b && got_c);
 274
 275         sd_event_source_unref(x);
 276         sd_event_source_unref(y);
 277
 278         do_quit = true;
 279         assert_se(sd_event_add_post(e, NULL, post_handler, NULL) >= 0);
 280         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
 281         assert_se(sd_event_source_set_time(z, event_now + 200 * USEC_PER_MSEC) >= 0);
 282         assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
 283
 284         assert_se(sd_event_loop(e) >= 0);
 285         assert_se(got_post);
 286         assert_se(got_exit);
 287
 288         sd_event_source_unref(z);
 289         sd_event_source_unref(q);
 290
 291         sd_event_source_unref(w);
 292
 293         sd_event_unref(e);
 294
 295         safe_close_pair(a);
 296         safe_close_pair(b);
 297         safe_close_pair(d);
 298         safe_close_pair(k);
 299
 300         assert_se(unsetenv("SYSTEMD_PIDFD") >= 0);
 301 }
 302
 303 static void test_sd_event_now(void) {
 304         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 305         uint64_t event_now;
 306
 307         log_info("/* %s */", __func__);
 308
 309         assert_se(sd_event_new(&e) >= 0);
 310         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
 311         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) > 0);
 312         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) > 0);
 313         if (clock_boottime_supported()) {
 314                 assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) > 0);
 315                 assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) > 0);
 316         }
 317         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 318         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 319
 320         assert_se(sd_event_run(e, 0) == 0);
 321
 322         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
 323         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) == 0);
 324         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) == 0);
 325         if (clock_boottime_supported()) {
 326                 assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) == 0);
 327                 assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) == 0);
 328         }
 329         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 330         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 331 }
 332
 333 static int last_rtqueue_sigval = 0;
 334 static int n_rtqueue = 0;
 335
 336 static int rtqueue_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 337         last_rtqueue_sigval = si->ssi_int;
 338         n_rtqueue++;
 339         return 0;
 340 }
 341
 342 static void test_rtqueue(void) {
 343         sd_event_source *u = NULL, *v = NULL, *s = NULL;
 344         sd_event *e = NULL;
 345
 346         log_info("/* %s */", __func__);
 347
 348         assert_se(sd_event_default(&e) >= 0);
 349
 350         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+2, SIGRTMIN+3, SIGUSR2, -1) >= 0);
 351         assert_se(sd_event_add_signal(e, &u, SIGRTMIN+2, rtqueue_handler, NULL) >= 0);
 352         assert_se(sd_event_add_signal(e, &v, SIGRTMIN+3, rtqueue_handler, NULL) >= 0);
 353         assert_se(sd_event_add_signal(e, &s, SIGUSR2, rtqueue_handler, NULL) >= 0);
 354
 355         assert_se(sd_event_source_set_priority(v, -10) >= 0);
 356
 357         assert_se(sigqueue(getpid_cached(), SIGRTMIN+2, (union sigval) { .sival_int = 1 }) >= 0);
 358         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 2 }) >= 0);
 359         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 3 }) >= 0);
 360         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 4 }) >= 0);
 361         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 5 }) >= 0);
 362
 363         assert_se(n_rtqueue == 0);
 364         assert_se(last_rtqueue_sigval == 0);
 365
 366         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 367         assert_se(n_rtqueue == 1);
 368         assert_se(last_rtqueue_sigval == 2); /* first SIGRTMIN+3 */
 369
 370         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 371         assert_se(n_rtqueue == 2);
 372         assert_se(last_rtqueue_sigval == 4); /* second SIGRTMIN+3 */
 373
 374         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 375         assert_se(n_rtqueue == 3);
 376         assert_se(last_rtqueue_sigval == 3); /* first SIGUSR2 */
 377
 378         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 379         assert_se(n_rtqueue == 4);
 380         assert_se(last_rtqueue_sigval == 1); /* SIGRTMIN+2 */
 381
 382         assert_se(sd_event_run(e, 0) == 0); /* the other SIGUSR2 is dropped, because the first one was still queued */
 383         assert_se(n_rtqueue == 4);
 384         assert_se(last_rtqueue_sigval == 1);
 385
 386         sd_event_source_unref(u);
 387         sd_event_source_unref(v);
 388         sd_event_source_unref(s);
 389
 390         sd_event_unref(e);
 391 }
 392
 393 #define CREATE_EVENTS_MAX (70000U)
 394
 395 struct inotify_context {
 396         bool delete_self_handler_called;
 397         unsigned create_called[CREATE_EVENTS_MAX];
 398         unsigned create_overflow;
 399         unsigned n_create_events;
 400 };
 401
 402 static void maybe_exit(sd_event_source *s, struct inotify_context *c) {
 403         unsigned n;
 404
 405         assert(s);
 406         assert(c);
 407
 408         if (!c->delete_self_handler_called)
 409                 return;
 410
 411         for (n = 0; n < 3; n++) {
 412                 unsigned i;
 413
 414                 if (c->create_overflow & (1U << n))
 415                         continue;
 416
 417                 for (i = 0; i < c->n_create_events; i++)
 418                         if (!(c->create_called[i] & (1U << n)))
 419                                 return;
 420         }
 421
 422         sd_event_exit(sd_event_source_get_event(s), 0);
 423 }
 424
 425 static int inotify_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 426         struct inotify_context *c = userdata;
 427         const char *description;
 428         unsigned bit, n;
 429
 430         assert_se(sd_event_source_get_description(s, &description) >= 0);
 431         assert_se(safe_atou(description, &n) >= 0);
 432
 433         assert_se(n <= 3);
 434         bit = 1U << n;
 435
 436         if (ev->mask & IN_Q_OVERFLOW) {
 437                 log_info("inotify-handler <%s>: overflow", description);
 438                 c->create_overflow |= bit;
 439         } else if (ev->mask & IN_CREATE) {
 440                 unsigned i;
 441
 442                 log_debug("inotify-handler <%s>: create on %s", description, ev->name);
 443
 444                 if (!streq(ev->name, "sub")) {
 445                         assert_se(safe_atou(ev->name, &i) >= 0);
 446
 447                         assert_se(i < c->n_create_events);
 448                         c->create_called[i] |= bit;
 449                 }
 450         } else if (ev->mask & IN_DELETE) {
 451                 log_info("inotify-handler <%s>: delete of %s", description, ev->name);
 452                 assert_se(streq(ev->name, "sub"));
 453         } else
 454                 assert_not_reached("unexpected inotify event");
 455
 456         maybe_exit(s, c);
 457         return 1;
 458 }
 459
 460 static int delete_self_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 461         struct inotify_context *c = userdata;
 462
 463         if (ev->mask & IN_Q_OVERFLOW) {
 464                 log_info("delete-self-handler: overflow");
 465                 c->delete_self_handler_called = true;
 466         } else if (ev->mask & IN_DELETE_SELF) {
 467                 log_info("delete-self-handler: delete-self");
 468                 c->delete_self_handler_called = true;
 469         } else if (ev->mask & IN_IGNORED) {
 470                 log_info("delete-self-handler: ignore");
 471         } else
 472                 assert_not_reached("unexpected inotify event (delete-self)");
 473
 474         maybe_exit(s, c);
 475         return 1;
 476 }
 477
 478 static void test_inotify(unsigned n_create_events) {
 479         _cleanup_(rm_rf_physical_and_freep) char *p = NULL;
 480         sd_event_source *a = NULL, *b = NULL, *c = NULL, *d = NULL;
 481         struct inotify_context context = {
 482                 .n_create_events = n_create_events,
 483         };
 484         sd_event *e = NULL;
 485         const char *q;
 486         unsigned i;
 487
 488         log_info("/* %s(%u) */", __func__, n_create_events);
 489
 490         assert_se(sd_event_default(&e) >= 0);
 491
 492         assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &p) >= 0);
 493
 494         assert_se(sd_event_add_inotify(e, &a, p, IN_CREATE|IN_ONLYDIR, inotify_handler, &context) >= 0);
 495         assert_se(sd_event_add_inotify(e, &b, p, IN_CREATE|IN_DELETE|IN_DONT_FOLLOW, inotify_handler, &context) >= 0);
 496         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_IDLE) >= 0);
 497         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_NORMAL) >= 0);
 498         assert_se(sd_event_add_inotify(e, &c, p, IN_CREATE|IN_DELETE|IN_EXCL_UNLINK, inotify_handler, &context) >= 0);
 499         assert_se(sd_event_source_set_priority(c, SD_EVENT_PRIORITY_IDLE) >= 0);
 500
 501         assert_se(sd_event_source_set_description(a, "0") >= 0);
 502         assert_se(sd_event_source_set_description(b, "1") >= 0);
 503         assert_se(sd_event_source_set_description(c, "2") >= 0);
 504
 505         q = strjoina(p, "/sub");
 506         assert_se(touch(q) >= 0);
 507         assert_se(sd_event_add_inotify(e, &d, q, IN_DELETE_SELF, delete_self_handler, &context) >= 0);
 508
 509         for (i = 0; i < n_create_events; i++) {
 510                 char buf[DECIMAL_STR_MAX(unsigned)+1];
 511                 _cleanup_free_ char *z;
 512
 513                 xsprintf(buf, "%u", i);
 514                 assert_se(z = path_join(p, buf));
 515
 516                 assert_se(touch(z) >= 0);
 517         }
 518
 519         assert_se(unlink(q) >= 0);
 520
 521         assert_se(sd_event_loop(e) >= 0);
 522
 523         sd_event_source_unref(a);
 524         sd_event_source_unref(b);
 525         sd_event_source_unref(c);
 526         sd_event_source_unref(d);
 527
 528         sd_event_unref(e);
 529 }
 530
 531 static int pidfd_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
 532         assert_se(s);
 533         assert_se(si);
 534
 535         assert_se(si->si_uid == getuid());
 536         assert_se(si->si_signo == SIGCHLD);
 537         assert_se(si->si_code == CLD_EXITED);
 538         assert_se(si->si_status == 66);
 539
 540         log_info("got pidfd on %c", PTR_TO_INT(userdata));
 541
 542         assert_se(userdata == INT_TO_PTR('p'));
 543
 544         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
 545         sd_event_source_unref(s);
 546
 547         return 0;
 548 }
 549
 550 static void test_pidfd(void) {
 551         sd_event_source *s = NULL, *t = NULL;
 552         sd_event *e = NULL;
 553         int pidfd;
 554         pid_t pid, pid2;
 555
 556         log_info("/* %s */", __func__);
 557
 558         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, -1) >= 0);
 559
 560         pid = fork();
 561         if (pid == 0)
 562                 /* child */
 563                 _exit(66);
 564
 565         assert_se(pid > 1);
 566
 567         pidfd = pidfd_open(pid, 0);
 568         if (pidfd < 0) {
 569                 /* No pidfd_open() supported or blocked? */
 570                 assert_se(ERRNO_IS_NOT_SUPPORTED(errno) || ERRNO_IS_PRIVILEGE(errno));
 571                 (void) wait_for_terminate(pid, NULL);
 572                 return;
 573         }
 574
 575         pid2 = fork();
 576         if (pid2 == 0)
 577                 freeze();
 578
 579         assert_se(pid > 2);
 580
 581         assert_se(sd_event_default(&e) >= 0);
 582         assert_se(sd_event_add_child_pidfd(e, &s, pidfd, WEXITED, pidfd_handler, INT_TO_PTR('p')) >= 0);
 583         assert_se(sd_event_source_set_child_pidfd_own(s, true) >= 0);
 584
 585         /* This one should never trigger, since our second child lives forever */
 586         assert_se(sd_event_add_child(e, &t, pid2, WEXITED, pidfd_handler, INT_TO_PTR('q')) >= 0);
 587         assert_se(sd_event_source_set_child_process_own(t, true) >= 0);
 588
 589         assert_se(sd_event_loop(e) >= 0);
 590
 591         /* Child should still be alive */
 592         assert_se(kill(pid2, 0) >= 0);
 593
 594         t = sd_event_source_unref(t);
 595
 596         /* Child should now be dead, since we dropped the ref */
 597         assert_se(kill(pid2, 0) < 0 && errno == ESRCH);
 598
 599         sd_event_unref(e);
 600 }
 601
 602 static int ratelimit_io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 603         unsigned *c = (unsigned*) userdata;
 604         *c += 1;
 605         return 0;
 606 }
 607
 608 static int ratelimit_time_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 609         int r;
 610
 611         r = sd_event_source_set_enabled(s, SD_EVENT_ON);
 612         if (r < 0)
 613                 log_warning_errno(r, "Failed to turn on notify event source: %m");
 614
 615         r = sd_event_source_set_time(s, usec + 1000);
 616         if (r < 0)
 617                 log_error_errno(r, "Failed to restart watchdog event source: %m");
 618
 619         unsigned *c = (unsigned*) userdata;
 620         *c += 1;
 621
 622         return 0;
 623 }
 624
 625 static void test_ratelimit(void) {
 626         _cleanup_close_pair_ int p[2] = {-1, -1};
 627         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 628         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
 629         uint64_t interval;
 630         unsigned count, burst;
 631
 632         log_info("/* %s */", __func__);
 633
 634         assert_se(sd_event_default(&e) >= 0);
 635         assert_se(pipe2(p, O_CLOEXEC|O_NONBLOCK) >= 0);
 636
 637         assert_se(sd_event_add_io(e, &s, p[0], EPOLLIN, ratelimit_io_handler, &count) >= 0);
 638         assert_se(sd_event_source_set_description(s, "test-ratelimit-io") >= 0);
 639         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 640         assert_se(sd_event_source_get_ratelimit(s, &interval, &burst) >= 0);
 641         assert_se(interval == 1 * USEC_PER_SEC && burst == 5);
 642
 643         assert_se(write(p[1], "1", 1) == 1);
 644
 645         count = 0;
 646         for (unsigned i = 0; i < 10; i++) {
 647                 log_debug("slow loop iteration %u", i);
 648                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 649                 assert_se(usleep(250 * USEC_PER_MSEC) >= 0);
 650         }
 651
 652         assert_se(sd_event_source_is_ratelimited(s) == 0);
 653         assert_se(count == 10);
 654         log_info("ratelimit_io_handler: called %d times, event source not ratelimited", count);
 655
 656         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 657         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 658
 659         count = 0;
 660         for (unsigned i = 0; i < 10; i++) {
 661                 log_debug("fast event loop iteration %u", i);
 662                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 663                 assert_se(usleep(10) >= 0);
 664         }
 665         log_info("ratelimit_io_handler: called %d times, event source got ratelimited", count);
 666         assert_se(count < 10);
 667
 668         s = sd_event_source_unref(s);
 669         safe_close_pair(p);
 670
 671         count = 0;
 672         assert_se(sd_event_add_time_relative(e, &s, CLOCK_MONOTONIC, 1000, 1, ratelimit_time_handler, &count) >= 0);
 673         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) == 0);
 674
 675         do {
 676                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 677         } while (!sd_event_source_is_ratelimited(s));
 678
 679         log_info("ratelimit_time_handler: called %d times, event source got ratelimited", count);
 680         assert_se(count == 10);
 681
 682         /* In order to get rid of active rate limit client needs to disable it explicitly */
 683         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 684         assert_se(!sd_event_source_is_ratelimited(s));
 685
 686         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) >= 0);
 687
 688         do {
 689                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 690         } while (!sd_event_source_is_ratelimited(s));
 691
 692         log_info("ratelimit_time_handler: called 10 more times, event source got ratelimited");
 693         assert_se(count == 20);
 694 }
 695
 696 int main(int argc, char *argv[]) {
 697         test_setup_logging(LOG_DEBUG);
 698
 699         test_basic(true);   /* test with pidfd */
 700         test_basic(false);  /* test without pidfd */
 701
 702         test_sd_event_now();
 703         test_rtqueue();
 704
 705         test_inotify(100); /* should work without overflow */
 706         test_inotify(33000); /* should trigger a q overflow */
 707
 708         test_pidfd();
 709
 710         test_ratelimit();
 711
 712         return 0;
 713 }