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 "exec-util.h"
   9 #include "fd-util.h"
  10 #include "fs-util.h"
  11 #include "log.h"
  12 #include "macro.h"
  13 #include "missing_syscall.h"
  14 #include "parse-util.h"
  15 #include "path-util.h"
  16 #include "process-util.h"
  17 #include "random-util.h"
  18 #include "rm-rf.h"
  19 #include "signal-util.h"
  20 #include "stdio-util.h"
  21 #include "string-util.h"
  22 #include "tests.h"
  23 #include "tmpfile-util.h"
  24 #include "util.h"
  25
  26 static int prepare_handler(sd_event_source *s, void *userdata) {
  27         log_info("preparing %c", PTR_TO_INT(userdata));
  28         return 1;
  29 }
  30
  31 static bool got_a, got_b, got_c, got_unref;
  32 static unsigned got_d;
  33
  34 static int unref_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
  35         sd_event_source_unref(s);
  36         got_unref = true;
  37         return 0;
  38 }
  39
  40 static int io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
  41
  42         log_info("got IO on %c", PTR_TO_INT(userdata));
  43
  44         if (userdata == INT_TO_PTR('a')) {
  45                 assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
  46                 assert_se(!got_a);
  47                 got_a = true;
  48         } else if (userdata == INT_TO_PTR('b')) {
  49                 assert_se(!got_b);
  50                 got_b = true;
  51         } else if (userdata == INT_TO_PTR('d')) {
  52                 got_d++;
  53                 if (got_d < 2)
  54                         assert_se(sd_event_source_set_enabled(s, SD_EVENT_ONESHOT) >= 0);
  55                 else
  56                         assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
  57         } else
  58                 assert_not_reached();
  59
  60         return 1;
  61 }
  62
  63 static int child_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
  64
  65         assert_se(s);
  66         assert_se(si);
  67
  68         assert_se(si->si_uid == getuid());
  69         assert_se(si->si_signo == SIGCHLD);
  70         assert_se(si->si_code == CLD_EXITED);
  71         assert_se(si->si_status == 78);
  72
  73         log_info("got child on %c", PTR_TO_INT(userdata));
  74
  75         assert_se(userdata == INT_TO_PTR('f'));
  76
  77         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
  78         sd_event_source_unref(s);
  79
  80         return 1;
  81 }
  82
  83 static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
  84         sd_event_source *p = NULL;
  85         pid_t pid;
  86         siginfo_t plain_si;
  87
  88         assert_se(s);
  89         assert_se(si);
  90
  91         log_info("got signal on %c", PTR_TO_INT(userdata));
  92
  93         assert_se(userdata == INT_TO_PTR('e'));
  94
  95         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGUSR2, -1) >= 0);
  96
  97         pid = fork();
  98         assert_se(pid >= 0);
  99
 100         if (pid == 0) {
 101                 sigset_t ss;
 102
 103                 assert_se(sigemptyset(&ss) >= 0);
 104                 assert_se(sigaddset(&ss, SIGUSR2) >= 0);
 105
 106                 zero(plain_si);
 107                 assert_se(sigwaitinfo(&ss, &plain_si) >= 0);
 108
 109                 assert_se(plain_si.si_signo == SIGUSR2);
 110                 assert_se(plain_si.si_value.sival_int == 4711);
 111
 112                 _exit(78);
 113         }
 114
 115         assert_se(sd_event_add_child(sd_event_source_get_event(s), &p, pid, WEXITED, child_handler, INT_TO_PTR('f')) >= 0);
 116         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 117         assert_se(sd_event_source_set_child_process_own(p, true) >= 0);
 118
 119         /* We can't use structured initialization here, since the structure contains various unions and these
 120          * fields lie in overlapping (carefully aligned) unions that LLVM is allergic to allow assignments
 121          * to */
 122         zero(plain_si);
 123         plain_si.si_signo = SIGUSR2;
 124         plain_si.si_code = SI_QUEUE;
 125         plain_si.si_pid = getpid();
 126         plain_si.si_uid = getuid();
 127         plain_si.si_value.sival_int = 4711;
 128
 129         assert_se(sd_event_source_send_child_signal(p, SIGUSR2, &plain_si, 0) >= 0);
 130
 131         sd_event_source_unref(s);
 132
 133         return 1;
 134 }
 135
 136 static int defer_handler(sd_event_source *s, void *userdata) {
 137         sd_event_source *p = NULL;
 138
 139         assert_se(s);
 140
 141         log_info("got defer on %c", PTR_TO_INT(userdata));
 142
 143         assert_se(userdata == INT_TO_PTR('d'));
 144
 145         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGUSR1, -1) >= 0);
 146
 147         assert_se(sd_event_add_signal(sd_event_source_get_event(s), &p, SIGUSR1, signal_handler, INT_TO_PTR('e')) >= 0);
 148         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 149         raise(SIGUSR1);
 150
 151         sd_event_source_unref(s);
 152
 153         return 1;
 154 }
 155
 156 static bool do_quit;
 157
 158 static int time_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 159         log_info("got timer on %c", PTR_TO_INT(userdata));
 160
 161         if (userdata == INT_TO_PTR('c')) {
 162
 163                 if (do_quit) {
 164                         sd_event_source *p;
 165
 166                         assert_se(sd_event_add_defer(sd_event_source_get_event(s), &p, defer_handler, INT_TO_PTR('d')) >= 0);
 167                         assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
 168                 } else {
 169                         assert_se(!got_c);
 170                         got_c = true;
 171                 }
 172         } else
 173                 assert_not_reached();
 174
 175         return 2;
 176 }
 177
 178 static bool got_exit = false;
 179
 180 static int exit_handler(sd_event_source *s, void *userdata) {
 181         log_info("got quit handler on %c", PTR_TO_INT(userdata));
 182
 183         got_exit = true;
 184
 185         return 3;
 186 }
 187
 188 static bool got_post = false;
 189
 190 static int post_handler(sd_event_source *s, void *userdata) {
 191         log_info("got post handler");
 192
 193         got_post = true;
 194
 195         return 2;
 196 }
 197
 198 static void test_basic_one(bool with_pidfd) {
 199         sd_event *e = NULL;
 200         sd_event_source *w = NULL, *x = NULL, *y = NULL, *z = NULL, *q = NULL, *t = NULL;
 201         static const char ch = 'x';
 202         int a[2] = { -1, -1 }, b[2] = { -1, -1}, d[2] = { -1, -1}, k[2] = { -1, -1 };
 203         uint64_t event_now;
 204         int64_t priority;
 205
 206         log_info("/* %s(pidfd=%s) */", __func__, yes_no(with_pidfd));
 207
 208         assert_se(setenv("SYSTEMD_PIDFD", yes_no(with_pidfd), 1) >= 0);
 209
 210         assert_se(pipe(a) >= 0);
 211         assert_se(pipe(b) >= 0);
 212         assert_se(pipe(d) >= 0);
 213         assert_se(pipe(k) >= 0);
 214
 215         assert_se(sd_event_default(&e) >= 0);
 216         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
 217
 218         assert_se(sd_event_set_watchdog(e, true) >= 0);
 219
 220         /* Test whether we cleanly can destroy an io event source from its own handler */
 221         got_unref = false;
 222         assert_se(sd_event_add_io(e, &t, k[0], EPOLLIN, unref_handler, NULL) >= 0);
 223         assert_se(write(k[1], &ch, 1) == 1);
 224         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 225         assert_se(got_unref);
 226
 227         got_a = false, got_b = false, got_c = false, got_d = 0;
 228
 229         /* Add a oneshot handler, trigger it, reenable it, and trigger
 230          * it again. */
 231         assert_se(sd_event_add_io(e, &w, d[0], EPOLLIN, io_handler, INT_TO_PTR('d')) >= 0);
 232         assert_se(sd_event_source_set_enabled(w, SD_EVENT_ONESHOT) >= 0);
 233         assert_se(write(d[1], &ch, 1) >= 0);
 234         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 235         assert_se(got_d == 1);
 236         assert_se(write(d[1], &ch, 1) >= 0);
 237         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 238         assert_se(got_d == 2);
 239
 240         assert_se(sd_event_add_io(e, &x, a[0], EPOLLIN, io_handler, INT_TO_PTR('a')) >= 0);
 241         assert_se(sd_event_add_io(e, &y, b[0], EPOLLIN, io_handler, INT_TO_PTR('b')) >= 0);
 242
 243         do_quit = false;
 244         assert_se(sd_event_add_time(e, &z, CLOCK_MONOTONIC, 0, 0, time_handler, INT_TO_PTR('c')) >= 0);
 245         assert_se(sd_event_add_exit(e, &q, exit_handler, INT_TO_PTR('g')) >= 0);
 246
 247         assert_se(sd_event_source_set_priority(x, 99) >= 0);
 248         assert_se(sd_event_source_get_priority(x, &priority) >= 0);
 249         assert_se(priority == 99);
 250         assert_se(sd_event_source_set_enabled(y, SD_EVENT_ONESHOT) >= 0);
 251         assert_se(sd_event_source_set_prepare(x, prepare_handler) >= 0);
 252         assert_se(sd_event_source_set_priority(z, 50) >= 0);
 253         assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
 254         assert_se(sd_event_source_set_prepare(z, prepare_handler) >= 0);
 255
 256         /* Test for floating event sources */
 257         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+1, -1) >= 0);
 258         assert_se(sd_event_add_signal(e, NULL, SIGRTMIN+1, NULL, NULL) >= 0);
 259
 260         assert_se(write(a[1], &ch, 1) >= 0);
 261         assert_se(write(b[1], &ch, 1) >= 0);
 262
 263         assert_se(!got_a && !got_b && !got_c);
 264
 265         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 266
 267         assert_se(!got_a && got_b && !got_c);
 268
 269         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 270
 271         assert_se(!got_a && got_b && got_c);
 272
 273         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 274
 275         assert_se(got_a && got_b && got_c);
 276
 277         sd_event_source_unref(x);
 278         sd_event_source_unref(y);
 279
 280         do_quit = true;
 281         assert_se(sd_event_add_post(e, NULL, post_handler, NULL) >= 0);
 282         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
 283         assert_se(sd_event_source_set_time(z, event_now + 200 * USEC_PER_MSEC) >= 0);
 284         assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
 285
 286         assert_se(sd_event_loop(e) >= 0);
 287         assert_se(got_post);
 288         assert_se(got_exit);
 289
 290         sd_event_source_unref(z);
 291         sd_event_source_unref(q);
 292
 293         sd_event_source_unref(w);
 294
 295         sd_event_unref(e);
 296
 297         safe_close_pair(a);
 298         safe_close_pair(b);
 299         safe_close_pair(d);
 300         safe_close_pair(k);
 301
 302         assert_se(unsetenv("SYSTEMD_PIDFD") >= 0);
 303 }
 304
 305 TEST(basic) {
 306         test_basic_one(true);   /* test with pidfd */
 307         test_basic_one(false);  /* test without pidfd */
 308 }
 309
 310 TEST(sd_event_now) {
 311         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 312         uint64_t event_now;
 313
 314         assert_se(sd_event_new(&e) >= 0);
 315         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
 316         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) > 0);
 317         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) > 0);
 318         assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) > 0);
 319         assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) > 0);
 320         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 321         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 322
 323         assert_se(sd_event_run(e, 0) == 0);
 324
 325         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
 326         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) == 0);
 327         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) == 0);
 328         assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) == 0);
 329         assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) == 0);
 330         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 331         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 332 }
 333
 334 static int last_rtqueue_sigval = 0;
 335 static int n_rtqueue = 0;
 336
 337 static int rtqueue_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 338         last_rtqueue_sigval = si->ssi_int;
 339         n_rtqueue++;
 340         return 0;
 341 }
 342
 343 TEST(rtqueue) {
 344         sd_event_source *u = NULL, *v = NULL, *s = NULL;
 345         sd_event *e = NULL;
 346
 347         assert_se(sd_event_default(&e) >= 0);
 348
 349         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+2, SIGRTMIN+3, SIGUSR2, -1) >= 0);
 350         assert_se(sd_event_add_signal(e, &u, SIGRTMIN+2, rtqueue_handler, NULL) >= 0);
 351         assert_se(sd_event_add_signal(e, &v, SIGRTMIN+3, rtqueue_handler, NULL) >= 0);
 352         assert_se(sd_event_add_signal(e, &s, SIGUSR2, rtqueue_handler, NULL) >= 0);
 353
 354         assert_se(sd_event_source_set_priority(v, -10) >= 0);
 355
 356         assert_se(sigqueue(getpid_cached(), SIGRTMIN+2, (union sigval) { .sival_int = 1 }) >= 0);
 357         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 2 }) >= 0);
 358         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 3 }) >= 0);
 359         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 4 }) >= 0);
 360         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 5 }) >= 0);
 361
 362         assert_se(n_rtqueue == 0);
 363         assert_se(last_rtqueue_sigval == 0);
 364
 365         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 366         assert_se(n_rtqueue == 1);
 367         assert_se(last_rtqueue_sigval == 2); /* first SIGRTMIN+3 */
 368
 369         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 370         assert_se(n_rtqueue == 2);
 371         assert_se(last_rtqueue_sigval == 4); /* second SIGRTMIN+3 */
 372
 373         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 374         assert_se(n_rtqueue == 3);
 375         assert_se(last_rtqueue_sigval == 3); /* first SIGUSR2 */
 376
 377         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 378         assert_se(n_rtqueue == 4);
 379         assert_se(last_rtqueue_sigval == 1); /* SIGRTMIN+2 */
 380
 381         assert_se(sd_event_run(e, 0) == 0); /* the other SIGUSR2 is dropped, because the first one was still queued */
 382         assert_se(n_rtqueue == 4);
 383         assert_se(last_rtqueue_sigval == 1);
 384
 385         sd_event_source_unref(u);
 386         sd_event_source_unref(v);
 387         sd_event_source_unref(s);
 388
 389         sd_event_unref(e);
 390 }
 391
 392 #define CREATE_EVENTS_MAX (70000U)
 393
 394 struct inotify_context {
 395         bool delete_self_handler_called;
 396         unsigned create_called[CREATE_EVENTS_MAX];
 397         unsigned create_overflow;
 398         unsigned n_create_events;
 399 };
 400
 401 static void maybe_exit(sd_event_source *s, struct inotify_context *c) {
 402         unsigned n;
 403
 404         assert_se(s);
 405         assert_se(c);
 406
 407         if (!c->delete_self_handler_called)
 408                 return;
 409
 410         for (n = 0; n < 3; n++) {
 411                 unsigned i;
 412
 413                 if (c->create_overflow & (1U << n))
 414                         continue;
 415
 416                 for (i = 0; i < c->n_create_events; i++)
 417                         if (!(c->create_called[i] & (1U << n)))
 418                                 return;
 419         }
 420
 421         sd_event_exit(sd_event_source_get_event(s), 0);
 422 }
 423
 424 static int inotify_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 425         struct inotify_context *c = userdata;
 426         const char *description;
 427         unsigned bit, n;
 428
 429         assert_se(sd_event_source_get_description(s, &description) >= 0);
 430         assert_se(safe_atou(description, &n) >= 0);
 431
 432         assert_se(n <= 3);
 433         bit = 1U << n;
 434
 435         if (ev->mask & IN_Q_OVERFLOW) {
 436                 log_info("inotify-handler <%s>: overflow", description);
 437                 c->create_overflow |= bit;
 438         } else if (ev->mask & IN_CREATE) {
 439                 if (streq(ev->name, "sub"))
 440                         log_debug("inotify-handler <%s>: create on %s", description, ev->name);
 441                 else {
 442                         unsigned i;
 443
 444                         assert_se(safe_atou(ev->name, &i) >= 0);
 445                         assert_se(i < c->n_create_events);
 446                         c->create_called[i] |= bit;
 447                 }
 448         } else if (ev->mask & IN_DELETE) {
 449                 log_info("inotify-handler <%s>: delete of %s", description, ev->name);
 450                 assert_se(streq(ev->name, "sub"));
 451         } else
 452                 assert_not_reached();
 453
 454         maybe_exit(s, c);
 455         return 1;
 456 }
 457
 458 static int delete_self_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 459         struct inotify_context *c = userdata;
 460
 461         if (ev->mask & IN_Q_OVERFLOW) {
 462                 log_info("delete-self-handler: overflow");
 463                 c->delete_self_handler_called = true;
 464         } else if (ev->mask & IN_DELETE_SELF) {
 465                 log_info("delete-self-handler: delete-self");
 466                 c->delete_self_handler_called = true;
 467         } else if (ev->mask & IN_IGNORED) {
 468                 log_info("delete-self-handler: ignore");
 469         } else
 470                 assert_not_reached();
 471
 472         maybe_exit(s, c);
 473         return 1;
 474 }
 475
 476 static void test_inotify_one(unsigned n_create_events) {
 477         _cleanup_(rm_rf_physical_and_freep) char *p = NULL;
 478         sd_event_source *a = NULL, *b = NULL, *c = NULL, *d = NULL;
 479         struct inotify_context context = {
 480                 .n_create_events = n_create_events,
 481         };
 482         sd_event *e = NULL;
 483         const char *q;
 484         unsigned i;
 485
 486         log_info("/* %s(%u) */", __func__, n_create_events);
 487
 488         assert_se(sd_event_default(&e) >= 0);
 489
 490         assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &p) >= 0);
 491
 492         assert_se(sd_event_add_inotify(e, &a, p, IN_CREATE|IN_ONLYDIR, inotify_handler, &context) >= 0);
 493         assert_se(sd_event_add_inotify(e, &b, p, IN_CREATE|IN_DELETE|IN_DONT_FOLLOW, inotify_handler, &context) >= 0);
 494         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_IDLE) >= 0);
 495         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_NORMAL) >= 0);
 496         assert_se(sd_event_add_inotify(e, &c, p, IN_CREATE|IN_DELETE|IN_EXCL_UNLINK, inotify_handler, &context) >= 0);
 497         assert_se(sd_event_source_set_priority(c, SD_EVENT_PRIORITY_IDLE) >= 0);
 498
 499         assert_se(sd_event_source_set_description(a, "0") >= 0);
 500         assert_se(sd_event_source_set_description(b, "1") >= 0);
 501         assert_se(sd_event_source_set_description(c, "2") >= 0);
 502
 503         q = strjoina(p, "/sub");
 504         assert_se(touch(q) >= 0);
 505         assert_se(sd_event_add_inotify(e, &d, q, IN_DELETE_SELF, delete_self_handler, &context) >= 0);
 506
 507         for (i = 0; i < n_create_events; i++) {
 508                 char buf[DECIMAL_STR_MAX(unsigned)+1];
 509                 _cleanup_free_ char *z;
 510
 511                 xsprintf(buf, "%u", i);
 512                 assert_se(z = path_join(p, buf));
 513
 514                 assert_se(touch(z) >= 0);
 515         }
 516
 517         assert_se(unlink(q) >= 0);
 518
 519         assert_se(sd_event_loop(e) >= 0);
 520
 521         sd_event_source_unref(a);
 522         sd_event_source_unref(b);
 523         sd_event_source_unref(c);
 524         sd_event_source_unref(d);
 525
 526         sd_event_unref(e);
 527 }
 528
 529 TEST(inotify) {
 530         test_inotify_one(100); /* should work without overflow */
 531         test_inotify_one(33000); /* should trigger a q overflow */
 532 }
 533
 534 static int pidfd_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
 535         assert_se(s);
 536         assert_se(si);
 537
 538         assert_se(si->si_uid == getuid());
 539         assert_se(si->si_signo == SIGCHLD);
 540         assert_se(si->si_code == CLD_EXITED);
 541         assert_se(si->si_status == 66);
 542
 543         log_info("got pidfd on %c", PTR_TO_INT(userdata));
 544
 545         assert_se(userdata == INT_TO_PTR('p'));
 546
 547         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
 548         sd_event_source_unref(s);
 549
 550         return 0;
 551 }
 552
 553 TEST(pidfd) {
 554         sd_event_source *s = NULL, *t = NULL;
 555         sd_event *e = NULL;
 556         int pidfd;
 557         pid_t pid, pid2;
 558
 559         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, -1) >= 0);
 560
 561         pid = fork();
 562         if (pid == 0)
 563                 /* child */
 564                 _exit(66);
 565
 566         assert_se(pid > 1);
 567
 568         pidfd = pidfd_open(pid, 0);
 569         if (pidfd < 0) {
 570                 /* No pidfd_open() supported or blocked? */
 571                 assert_se(ERRNO_IS_NOT_SUPPORTED(errno) || ERRNO_IS_PRIVILEGE(errno));
 572                 (void) wait_for_terminate(pid, NULL);
 573                 return;
 574         }
 575
 576         pid2 = fork();
 577         if (pid2 == 0)
 578                 freeze();
 579
 580         assert_se(pid > 2);
 581
 582         assert_se(sd_event_default(&e) >= 0);
 583         assert_se(sd_event_add_child_pidfd(e, &s, pidfd, WEXITED, pidfd_handler, INT_TO_PTR('p')) >= 0);
 584         assert_se(sd_event_source_set_child_pidfd_own(s, true) >= 0);
 585
 586         /* This one should never trigger, since our second child lives forever */
 587         assert_se(sd_event_add_child(e, &t, pid2, WEXITED, pidfd_handler, INT_TO_PTR('q')) >= 0);
 588         assert_se(sd_event_source_set_child_process_own(t, true) >= 0);
 589
 590         assert_se(sd_event_loop(e) >= 0);
 591
 592         /* Child should still be alive */
 593         assert_se(kill(pid2, 0) >= 0);
 594
 595         t = sd_event_source_unref(t);
 596
 597         /* Child should now be dead, since we dropped the ref */
 598         assert_se(kill(pid2, 0) < 0 && errno == ESRCH);
 599
 600         sd_event_unref(e);
 601 }
 602
 603 static int ratelimit_io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 604         unsigned *c = (unsigned*) userdata;
 605         *c += 1;
 606         return 0;
 607 }
 608
 609 static int ratelimit_time_handler(sd_event_source *s, uint64_t usec, void *userdata) {
 610         int r;
 611
 612         r = sd_event_source_set_enabled(s, SD_EVENT_ON);
 613         if (r < 0)
 614                 log_warning_errno(r, "Failed to turn on notify event source: %m");
 615
 616         r = sd_event_source_set_time(s, usec + 1000);
 617         if (r < 0)
 618                 log_error_errno(r, "Failed to restart watchdog event source: %m");
 619
 620         unsigned *c = (unsigned*) userdata;
 621         *c += 1;
 622
 623         return 0;
 624 }
 625
 626 static int expired = -1;
 627 static int ratelimit_expired(sd_event_source *s, void *userdata) {
 628         return ++expired;
 629 }
 630
 631 TEST(ratelimit) {
 632         _cleanup_close_pair_ int p[2] = {-1, -1};
 633         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 634         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
 635         uint64_t interval;
 636         unsigned count, burst;
 637
 638         assert_se(sd_event_default(&e) >= 0);
 639         assert_se(pipe2(p, O_CLOEXEC|O_NONBLOCK) >= 0);
 640
 641         assert_se(sd_event_add_io(e, &s, p[0], EPOLLIN, ratelimit_io_handler, &count) >= 0);
 642         assert_se(sd_event_source_set_description(s, "test-ratelimit-io") >= 0);
 643         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 644         assert_se(sd_event_source_get_ratelimit(s, &interval, &burst) >= 0);
 645         assert_se(interval == 1 * USEC_PER_SEC && burst == 5);
 646
 647         assert_se(write(p[1], "1", 1) == 1);
 648
 649         count = 0;
 650         for (unsigned i = 0; i < 10; i++) {
 651                 log_debug("slow loop iteration %u", i);
 652                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 653                 assert_se(usleep(250 * USEC_PER_MSEC) >= 0);
 654         }
 655
 656         assert_se(sd_event_source_is_ratelimited(s) == 0);
 657         assert_se(count == 10);
 658         log_info("ratelimit_io_handler: called %d times, event source not ratelimited", count);
 659
 660         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 661         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 662
 663         count = 0;
 664         for (unsigned i = 0; i < 10; i++) {
 665                 log_debug("fast event loop iteration %u", i);
 666                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 667                 assert_se(usleep(10) >= 0);
 668         }
 669         log_info("ratelimit_io_handler: called %d times, event source got ratelimited", count);
 670         assert_se(count < 10);
 671
 672         s = sd_event_source_unref(s);
 673         safe_close_pair(p);
 674
 675         count = 0;
 676         assert_se(sd_event_add_time_relative(e, &s, CLOCK_MONOTONIC, 1000, 1, ratelimit_time_handler, &count) >= 0);
 677         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) == 0);
 678
 679         do {
 680                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 681         } while (!sd_event_source_is_ratelimited(s));
 682
 683         log_info("ratelimit_time_handler: called %d times, event source got ratelimited", count);
 684         assert_se(count == 10);
 685
 686         /* In order to get rid of active rate limit client needs to disable it explicitly */
 687         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 688         assert_se(!sd_event_source_is_ratelimited(s));
 689
 690         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) >= 0);
 691
 692         /* Set callback that will be invoked when we leave rate limited state. */
 693         assert_se(sd_event_source_set_ratelimit_expire_callback(s, ratelimit_expired) >= 0);
 694
 695         do {
 696                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 697         } while (!sd_event_source_is_ratelimited(s));
 698
 699         log_info("ratelimit_time_handler: called 10 more times, event source got ratelimited");
 700         assert_se(count == 20);
 701
 702         /* Dispatch the event loop once more and check that ratelimit expiration callback got called */
 703         assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 704         assert_se(expired == 0);
 705 }
 706
 707 TEST(simple_timeout) {
 708         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 709         usec_t f, t, some_time;
 710
 711         some_time = random_u64_range(2 * USEC_PER_SEC);
 712
 713         assert_se(sd_event_default(&e) >= 0);
 714
 715         assert_se(sd_event_prepare(e) == 0);
 716
 717         f = now(CLOCK_MONOTONIC);
 718         assert_se(sd_event_wait(e, some_time) >= 0);
 719         t = now(CLOCK_MONOTONIC);
 720
 721         /* The event loop may sleep longer than the specified time (timer accuracy, scheduling latencies, …),
 722          * but never shorter. Let's check that. */
 723         assert_se(t >= usec_add(f, some_time));
 724 }
 725
 726 static int inotify_self_destroy_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 727         sd_event_source **p = userdata;
 728
 729         assert_se(ev);
 730         assert_se(p);
 731         assert_se(*p == s);
 732
 733         assert_se(FLAGS_SET(ev->mask, IN_ATTRIB));
 734
 735         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
 736
 737         *p = sd_event_source_unref(*p); /* here's what we actually intend to test: we destroy the event
 738                                          * source from inside the event source handler */
 739         return 1;
 740 }
 741
 742 TEST(inotify_self_destroy) {
 743         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
 744         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 745         char path[] = "/tmp/inotifyXXXXXX";
 746         _cleanup_close_ int fd = -1;
 747
 748         /* Tests that destroying an inotify event source from its own handler is safe */
 749
 750         assert_se(sd_event_default(&e) >= 0);
 751
 752         fd = mkostemp_safe(path);
 753         assert_se(fd >= 0);
 754         assert_se(sd_event_add_inotify_fd(e, &s, fd, IN_ATTRIB, inotify_self_destroy_handler, &s) >= 0);
 755         fd = safe_close(fd);
 756         assert_se(unlink(path) >= 0); /* This will trigger IN_ATTRIB because link count goes to zero */
 757         assert_se(sd_event_loop(e) >= 0);
 758 }
 759
 760 struct inotify_process_buffered_data_context {
 761         const char *path[2];
 762         unsigned i;
 763 };
 764
 765 static int inotify_process_buffered_data_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 766         struct inotify_process_buffered_data_context *c = ASSERT_PTR(userdata);
 767         const char *description;
 768
 769         assert_se(sd_event_source_get_description(s, &description) >= 0);
 770
 771         assert_se(c->i < 2);
 772         assert_se(streq(c->path[c->i], description));
 773         c->i++;
 774
 775         return 1;
 776 }
 777
 778 TEST(inotify_process_buffered_data) {
 779         _cleanup_(rm_rf_physical_and_freep) char *p = NULL, *q = NULL;
 780         _cleanup_(sd_event_source_unrefp) sd_event_source *a = NULL, *b = NULL;
 781         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 782         _cleanup_free_ char *z = NULL;
 783
 784         /* For issue #23826 */
 785
 786         assert_se(sd_event_default(&e) >= 0);
 787
 788         assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &p) >= 0);
 789         assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &q) >= 0);
 790
 791         struct inotify_process_buffered_data_context context = {
 792                 .path = { p, q },
 793         };
 794
 795         assert_se(sd_event_add_inotify(e, &a, p, IN_CREATE, inotify_process_buffered_data_handler, &context) >= 0);
 796         assert_se(sd_event_add_inotify(e, &b, q, IN_CREATE, inotify_process_buffered_data_handler, &context) >= 0);
 797
 798         assert_se(z = path_join(p, "aaa"));
 799         assert_se(touch(z) >= 0);
 800         z = mfree(z);
 801         assert_se(z = path_join(q, "bbb"));
 802         assert_se(touch(z) >= 0);
 803         z = mfree(z);
 804
 805         assert_se(sd_event_run(e, 10 * USEC_PER_SEC) > 0);
 806         assert_se(sd_event_prepare(e) > 0); /* issue #23826: this was 0. */
 807         assert_se(sd_event_dispatch(e) > 0);
 808         assert_se(sd_event_prepare(e) == 0);
 809         assert_se(sd_event_wait(e, 0) == 0);
 810 }
 811
 812 DEFINE_TEST_MAIN(LOG_DEBUG);