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(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 static void test_sd_event_now(void) {
 306         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 307         uint64_t event_now;
 308
 309         log_info("/* %s */", __func__);
 310
 311         assert_se(sd_event_new(&e) >= 0);
 312         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
 313         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) > 0);
 314         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) > 0);
 315         if (clock_boottime_supported()) {
 316                 assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) > 0);
 317                 assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) > 0);
 318         }
 319         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 320         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 321
 322         assert_se(sd_event_run(e, 0) == 0);
 323
 324         assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
 325         assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) == 0);
 326         assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) == 0);
 327         if (clock_boottime_supported()) {
 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         }
 331         assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
 332         assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
 333 }
 334
 335 static int last_rtqueue_sigval = 0;
 336 static int n_rtqueue = 0;
 337
 338 static int rtqueue_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
 339         last_rtqueue_sigval = si->ssi_int;
 340         n_rtqueue++;
 341         return 0;
 342 }
 343
 344 static void test_rtqueue(void) {
 345         sd_event_source *u = NULL, *v = NULL, *s = NULL;
 346         sd_event *e = NULL;
 347
 348         log_info("/* %s */", __func__);
 349
 350         assert_se(sd_event_default(&e) >= 0);
 351
 352         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+2, SIGRTMIN+3, SIGUSR2, -1) >= 0);
 353         assert_se(sd_event_add_signal(e, &u, SIGRTMIN+2, rtqueue_handler, NULL) >= 0);
 354         assert_se(sd_event_add_signal(e, &v, SIGRTMIN+3, rtqueue_handler, NULL) >= 0);
 355         assert_se(sd_event_add_signal(e, &s, SIGUSR2, rtqueue_handler, NULL) >= 0);
 356
 357         assert_se(sd_event_source_set_priority(v, -10) >= 0);
 358
 359         assert_se(sigqueue(getpid_cached(), SIGRTMIN+2, (union sigval) { .sival_int = 1 }) >= 0);
 360         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 2 }) >= 0);
 361         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 3 }) >= 0);
 362         assert_se(sigqueue(getpid_cached(), SIGRTMIN+3, (union sigval) { .sival_int = 4 }) >= 0);
 363         assert_se(sigqueue(getpid_cached(), SIGUSR2, (union sigval) { .sival_int = 5 }) >= 0);
 364
 365         assert_se(n_rtqueue == 0);
 366         assert_se(last_rtqueue_sigval == 0);
 367
 368         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 369         assert_se(n_rtqueue == 1);
 370         assert_se(last_rtqueue_sigval == 2); /* first SIGRTMIN+3 */
 371
 372         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 373         assert_se(n_rtqueue == 2);
 374         assert_se(last_rtqueue_sigval == 4); /* second SIGRTMIN+3 */
 375
 376         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 377         assert_se(n_rtqueue == 3);
 378         assert_se(last_rtqueue_sigval == 3); /* first SIGUSR2 */
 379
 380         assert_se(sd_event_run(e, UINT64_MAX) >= 1);
 381         assert_se(n_rtqueue == 4);
 382         assert_se(last_rtqueue_sigval == 1); /* SIGRTMIN+2 */
 383
 384         assert_se(sd_event_run(e, 0) == 0); /* the other SIGUSR2 is dropped, because the first one was still queued */
 385         assert_se(n_rtqueue == 4);
 386         assert_se(last_rtqueue_sigval == 1);
 387
 388         sd_event_source_unref(u);
 389         sd_event_source_unref(v);
 390         sd_event_source_unref(s);
 391
 392         sd_event_unref(e);
 393 }
 394
 395 #define CREATE_EVENTS_MAX (70000U)
 396
 397 struct inotify_context {
 398         bool delete_self_handler_called;
 399         unsigned create_called[CREATE_EVENTS_MAX];
 400         unsigned create_overflow;
 401         unsigned n_create_events;
 402 };
 403
 404 static void maybe_exit(sd_event_source *s, struct inotify_context *c) {
 405         unsigned n;
 406
 407         assert(s);
 408         assert(c);
 409
 410         if (!c->delete_self_handler_called)
 411                 return;
 412
 413         for (n = 0; n < 3; n++) {
 414                 unsigned i;
 415
 416                 if (c->create_overflow & (1U << n))
 417                         continue;
 418
 419                 for (i = 0; i < c->n_create_events; i++)
 420                         if (!(c->create_called[i] & (1U << n)))
 421                                 return;
 422         }
 423
 424         sd_event_exit(sd_event_source_get_event(s), 0);
 425 }
 426
 427 static int inotify_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 428         struct inotify_context *c = userdata;
 429         const char *description;
 430         unsigned bit, n;
 431
 432         assert_se(sd_event_source_get_description(s, &description) >= 0);
 433         assert_se(safe_atou(description, &n) >= 0);
 434
 435         assert_se(n <= 3);
 436         bit = 1U << n;
 437
 438         if (ev->mask & IN_Q_OVERFLOW) {
 439                 log_info("inotify-handler <%s>: overflow", description);
 440                 c->create_overflow |= bit;
 441         } else if (ev->mask & IN_CREATE) {
 442                 if (streq(ev->name, "sub"))
 443                         log_debug("inotify-handler <%s>: create on %s", description, ev->name);
 444                 else {
 445                         unsigned i;
 446
 447                         assert_se(safe_atou(ev->name, &i) >= 0);
 448                         assert_se(i < c->n_create_events);
 449                         c->create_called[i] |= bit;
 450                 }
 451         } else if (ev->mask & IN_DELETE) {
 452                 log_info("inotify-handler <%s>: delete of %s", description, ev->name);
 453                 assert_se(streq(ev->name, "sub"));
 454         } else
 455                 assert_not_reached();
 456
 457         maybe_exit(s, c);
 458         return 1;
 459 }
 460
 461 static int delete_self_handler(sd_event_source *s, const struct inotify_event *ev, void *userdata) {
 462         struct inotify_context *c = userdata;
 463
 464         if (ev->mask & IN_Q_OVERFLOW) {
 465                 log_info("delete-self-handler: overflow");
 466                 c->delete_self_handler_called = true;
 467         } else if (ev->mask & IN_DELETE_SELF) {
 468                 log_info("delete-self-handler: delete-self");
 469                 c->delete_self_handler_called = true;
 470         } else if (ev->mask & IN_IGNORED) {
 471                 log_info("delete-self-handler: ignore");
 472         } else
 473                 assert_not_reached();
 474
 475         maybe_exit(s, c);
 476         return 1;
 477 }
 478
 479 static void test_inotify(unsigned n_create_events) {
 480         _cleanup_(rm_rf_physical_and_freep) char *p = NULL;
 481         sd_event_source *a = NULL, *b = NULL, *c = NULL, *d = NULL;
 482         struct inotify_context context = {
 483                 .n_create_events = n_create_events,
 484         };
 485         sd_event *e = NULL;
 486         const char *q;
 487         unsigned i;
 488
 489         log_info("/* %s(%u) */", __func__, n_create_events);
 490
 491         assert_se(sd_event_default(&e) >= 0);
 492
 493         assert_se(mkdtemp_malloc("/tmp/test-inotify-XXXXXX", &p) >= 0);
 494
 495         assert_se(sd_event_add_inotify(e, &a, p, IN_CREATE|IN_ONLYDIR, inotify_handler, &context) >= 0);
 496         assert_se(sd_event_add_inotify(e, &b, p, IN_CREATE|IN_DELETE|IN_DONT_FOLLOW, inotify_handler, &context) >= 0);
 497         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_IDLE) >= 0);
 498         assert_se(sd_event_source_set_priority(b, SD_EVENT_PRIORITY_NORMAL) >= 0);
 499         assert_se(sd_event_add_inotify(e, &c, p, IN_CREATE|IN_DELETE|IN_EXCL_UNLINK, inotify_handler, &context) >= 0);
 500         assert_se(sd_event_source_set_priority(c, SD_EVENT_PRIORITY_IDLE) >= 0);
 501
 502         assert_se(sd_event_source_set_description(a, "0") >= 0);
 503         assert_se(sd_event_source_set_description(b, "1") >= 0);
 504         assert_se(sd_event_source_set_description(c, "2") >= 0);
 505
 506         q = strjoina(p, "/sub");
 507         assert_se(touch(q) >= 0);
 508         assert_se(sd_event_add_inotify(e, &d, q, IN_DELETE_SELF, delete_self_handler, &context) >= 0);
 509
 510         for (i = 0; i < n_create_events; i++) {
 511                 char buf[DECIMAL_STR_MAX(unsigned)+1];
 512                 _cleanup_free_ char *z;
 513
 514                 xsprintf(buf, "%u", i);
 515                 assert_se(z = path_join(p, buf));
 516
 517                 assert_se(touch(z) >= 0);
 518         }
 519
 520         assert_se(unlink(q) >= 0);
 521
 522         assert_se(sd_event_loop(e) >= 0);
 523
 524         sd_event_source_unref(a);
 525         sd_event_source_unref(b);
 526         sd_event_source_unref(c);
 527         sd_event_source_unref(d);
 528
 529         sd_event_unref(e);
 530 }
 531
 532 static int pidfd_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
 533         assert_se(s);
 534         assert_se(si);
 535
 536         assert_se(si->si_uid == getuid());
 537         assert_se(si->si_signo == SIGCHLD);
 538         assert_se(si->si_code == CLD_EXITED);
 539         assert_se(si->si_status == 66);
 540
 541         log_info("got pidfd on %c", PTR_TO_INT(userdata));
 542
 543         assert_se(userdata == INT_TO_PTR('p'));
 544
 545         assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
 546         sd_event_source_unref(s);
 547
 548         return 0;
 549 }
 550
 551 static void test_pidfd(void) {
 552         sd_event_source *s = NULL, *t = NULL;
 553         sd_event *e = NULL;
 554         int pidfd;
 555         pid_t pid, pid2;
 556
 557         log_info("/* %s */", __func__);
 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 void test_ratelimit(void) {
 627         _cleanup_close_pair_ int p[2] = {-1, -1};
 628         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 629         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
 630         uint64_t interval;
 631         unsigned count, burst;
 632
 633         log_info("/* %s */", __func__);
 634
 635         assert_se(sd_event_default(&e) >= 0);
 636         assert_se(pipe2(p, O_CLOEXEC|O_NONBLOCK) >= 0);
 637
 638         assert_se(sd_event_add_io(e, &s, p[0], EPOLLIN, ratelimit_io_handler, &count) >= 0);
 639         assert_se(sd_event_source_set_description(s, "test-ratelimit-io") >= 0);
 640         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 641         assert_se(sd_event_source_get_ratelimit(s, &interval, &burst) >= 0);
 642         assert_se(interval == 1 * USEC_PER_SEC && burst == 5);
 643
 644         assert_se(write(p[1], "1", 1) == 1);
 645
 646         count = 0;
 647         for (unsigned i = 0; i < 10; i++) {
 648                 log_debug("slow loop iteration %u", i);
 649                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 650                 assert_se(usleep(250 * USEC_PER_MSEC) >= 0);
 651         }
 652
 653         assert_se(sd_event_source_is_ratelimited(s) == 0);
 654         assert_se(count == 10);
 655         log_info("ratelimit_io_handler: called %d times, event source not ratelimited", count);
 656
 657         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 658         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 5) >= 0);
 659
 660         count = 0;
 661         for (unsigned i = 0; i < 10; i++) {
 662                 log_debug("fast event loop iteration %u", i);
 663                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 664                 assert_se(usleep(10) >= 0);
 665         }
 666         log_info("ratelimit_io_handler: called %d times, event source got ratelimited", count);
 667         assert_se(count < 10);
 668
 669         s = sd_event_source_unref(s);
 670         safe_close_pair(p);
 671
 672         count = 0;
 673         assert_se(sd_event_add_time_relative(e, &s, CLOCK_MONOTONIC, 1000, 1, ratelimit_time_handler, &count) >= 0);
 674         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) == 0);
 675
 676         do {
 677                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 678         } while (!sd_event_source_is_ratelimited(s));
 679
 680         log_info("ratelimit_time_handler: called %d times, event source got ratelimited", count);
 681         assert_se(count == 10);
 682
 683         /* In order to get rid of active rate limit client needs to disable it explicitly */
 684         assert_se(sd_event_source_set_ratelimit(s, 0, 0) >= 0);
 685         assert_se(!sd_event_source_is_ratelimited(s));
 686
 687         assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) >= 0);
 688
 689         do {
 690                 assert_se(sd_event_run(e, UINT64_MAX) >= 0);
 691         } while (!sd_event_source_is_ratelimited(s));
 692
 693         log_info("ratelimit_time_handler: called 10 more times, event source got ratelimited");
 694         assert_se(count == 20);
 695 }
 696
 697 static void test_simple_timeout(void) {
 698         _cleanup_(sd_event_unrefp) sd_event *e = NULL;
 699         usec_t f, t, some_time;
 700
 701         some_time = random_u64_range(2 * USEC_PER_SEC);
 702
 703         assert_se(sd_event_default(&e) >= 0);
 704
 705         assert_se(sd_event_prepare(e) == 0);
 706
 707         f = now(CLOCK_MONOTONIC);
 708         assert_se(sd_event_wait(e, some_time) >= 0);
 709         t = now(CLOCK_MONOTONIC);
 710
 711         /* The event loop may sleep longer than the specified time (timer accuracy, scheduling latencies, …),
 712          * but never shorter. Let's check that. */
 713         assert_se(t >= usec_add(f, some_time));
 714 }
 715
 716 int main(int argc, char *argv[]) {
 717         test_setup_logging(LOG_DEBUG);
 718
 719         test_simple_timeout();
 720
 721         test_basic(true);   /* test with pidfd */
 722         test_basic(false);  /* test without pidfd */
 723
 724         test_sd_event_now();
 725         test_rtqueue();
 726
 727         test_inotify(100); /* should work without overflow */
 728         test_inotify(33000); /* should trigger a q overflow */
 729
 730         test_pidfd();
 731
 732         test_ratelimit();
 733
 734         return 0;
 735 }