src/test/test-process-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <linux/oom.h>
   5 #include <pthread.h>
   6 #include <stdlib.h>
   7 #include <sys/eventfd.h>
   8 #include <sys/mount.h>
   9 #include <sys/personality.h>
  10 #include <sys/prctl.h>
  11 #include <sys/stat.h>
  12 #include <sys/wait.h>
  13 #include <unistd.h>
  14 #include "strv.h"
  15 #if HAVE_VALGRIND_VALGRIND_H
  16 #include <valgrind/valgrind.h>
  17 #endif
  18
  19 #include "sd-daemon.h"
  20
  21 #include "alloc-util.h"
  22 #include "architecture.h"
  23 #include "argv-util.h"
  24 #include "errno-list.h"
  25 #include "errno-util.h"
  26 #include "fd-util.h"
  27 #include "ioprio-util.h"
  28 #include "log.h"
  29 #include "namespace-util.h"
  30 #include "parse-util.h"
  31 #include "pidfd-util.h"
  32 #include "pidref.h"
  33 #include "process-util.h"
  34 #include "procfs-util.h"
  35 #include "rlimit-util.h"
  36 #include "signal-util.h"
  37 #include "stdio-util.h"
  38 #include "string-util.h"
  39 #include "terminal-util.h"
  40 #include "tests.h"
  41 #include "time-util.h"
  42 #include "user-util.h"
  43 #include "virt.h"
  44
  45 static void test_pid_get_comm_one(pid_t pid) {
  46         struct stat st;
  47         _cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
  48         _cleanup_free_ char *env = NULL;
  49         char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
  50         pid_t e;
  51         uid_t u;
  52         gid_t g;
  53         dev_t h;
  54         int r;
  55
  56         log_info("/* %s */", __func__);
  57
  58         xsprintf(path, "/proc/"PID_FMT"/comm", pid);
  59
  60         if (stat(path, &st) == 0) {
  61                 ASSERT_OK(pid_get_comm(pid, &a));
  62                 log_info("PID"PID_FMT" comm: '%s'", pid, a);
  63         } else
  64                 log_warning("%s not exist.", path);
  65
  66         ASSERT_OK(pid_get_cmdline(pid, 0, PROCESS_CMDLINE_COMM_FALLBACK, &c));
  67         log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
  68
  69         ASSERT_OK(pid_get_cmdline(pid, 8, 0, &d));
  70         log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
  71
  72         free(d);
  73         ASSERT_OK(pid_get_cmdline(pid, 1, 0, &d));
  74         log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
  75
  76         r = pid_get_ppid(pid, &e);
  77         if (pid == 1)
  78                 ASSERT_ERROR(r, EADDRNOTAVAIL);
  79         else
  80                 ASSERT_OK(r);
  81         if (r >= 0) {
  82                 log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
  83                 ASSERT_GT(e, 0);
  84         }
  85
  86         ASSERT_TRUE(pid_is_kernel_thread(pid) == 0 || pid != 1);
  87
  88         ASSERT_OK_OR(get_process_exe(pid, &f), -EACCES);
  89         log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
  90
  91         ASSERT_OK_ZERO(pid_get_uid(pid, &u));
  92         log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
  93
  94         ASSERT_OK_ZERO(get_process_gid(pid, &g));
  95         log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
  96
  97         ASSERT_OK_OR(get_process_environ(pid, &env), -EACCES);
  98         log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
  99
 100         if (!detect_container() && pid == 1)
 101                 ASSERT_ERROR(get_ctty_devnr(pid, &h), ENXIO);
 102
 103         (void) getenv_for_pid(pid, "PATH", &i);
 104         log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
 105 }
 106
 107 TEST(pid_get_comm) {
 108         if (saved_argc > 1) {
 109                 pid_t pid = 0;
 110
 111                 (void) parse_pid(saved_argv[1], &pid);
 112                 test_pid_get_comm_one(pid);
 113         } else {
 114                 if (sd_booted() > 0)
 115                         test_pid_get_comm_one(1);
 116                 test_pid_get_comm_one(getpid());
 117         }
 118 }
 119
 120 static void test_pid_get_cmdline_one(pid_t pid) {
 121         _cleanup_free_ char *c = NULL, *d = NULL, *e = NULL, *f = NULL, *g = NULL, *h = NULL, *joined = NULL;
 122         _cleanup_strv_free_ char **strv_a = NULL, **strv_b = NULL;
 123         int r;
 124
 125         r = pid_get_cmdline(pid, SIZE_MAX, 0, &c);
 126         log_info("PID "PID_FMT": %s", pid, r >= 0 ? c : errno_to_name(r));
 127
 128         r = pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &d);
 129         log_info("      %s", r >= 0 ? d : errno_to_name(r));
 130
 131         r = pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &e);
 132         log_info("      %s", r >= 0 ? e : errno_to_name(r));
 133
 134         r = pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE | PROCESS_CMDLINE_COMM_FALLBACK, &f);
 135         log_info("      %s", r >= 0 ? f : errno_to_name(r));
 136
 137         r = pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &g);
 138         log_info("      %s", r >= 0 ? g : errno_to_name(r));
 139
 140         r = pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX | PROCESS_CMDLINE_COMM_FALLBACK, &h);
 141         log_info("      %s", r >= 0 ? h : errno_to_name(r));
 142
 143         r = pid_get_cmdline_strv(pid, 0, &strv_a);
 144         if (r >= 0)
 145                 ASSERT_NOT_NULL((joined = strv_join(strv_a, "\", \"")));
 146         log_info("      \"%s\"", r >= 0 ? joined : errno_to_name(r));
 147
 148         joined = mfree(joined);
 149
 150         r = pid_get_cmdline_strv(pid, PROCESS_CMDLINE_COMM_FALLBACK, &strv_b);
 151         if (r >= 0)
 152                 ASSERT_NOT_NULL((joined = strv_join(strv_b, "\", \"")));
 153         log_info("      \"%s\"", r >= 0 ? joined : errno_to_name(r));
 154 }
 155
 156 TEST(pid_get_cmdline) {
 157         _cleanup_closedir_ DIR *d = NULL;
 158         int r;
 159
 160         ASSERT_OK(proc_dir_open(&d));
 161
 162         for (;;) {
 163                 pid_t pid;
 164                 ASSERT_OK(r = proc_dir_read(d, &pid));
 165
 166                 if (r == 0) /* EOF */
 167                         break;
 168
 169                 test_pid_get_cmdline_one(pid);
 170         }
 171 }
 172
 173 static void test_pid_get_comm_escape_one(const char *input, const char *output) {
 174         _cleanup_free_ char *n = NULL;
 175
 176         log_debug("input: <%s> — output: <%s>", input, output);
 177
 178         ASSERT_OK_ERRNO(prctl(PR_SET_NAME, input));
 179         ASSERT_OK(pid_get_comm(0, &n));
 180
 181         log_debug("got: <%s>", n);
 182
 183         ASSERT_STREQ(n, output);
 184 }
 185
 186 TEST(pid_get_comm_escape) {
 187         _cleanup_free_ char *saved = NULL;
 188
 189         ASSERT_OK(pid_get_comm(0, &saved));
 190
 191         test_pid_get_comm_escape_one("", "");
 192         test_pid_get_comm_escape_one("foo", "foo");
 193         test_pid_get_comm_escape_one("012345678901234", "012345678901234");
 194         test_pid_get_comm_escape_one("0123456789012345", "012345678901234");
 195         test_pid_get_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
 196         test_pid_get_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
 197         test_pid_get_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
 198         test_pid_get_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
 199         test_pid_get_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 200         test_pid_get_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 201
 202         ASSERT_OK_ERRNO(prctl(PR_SET_NAME, saved));
 203 }
 204
 205 TEST(pid_is_unwaited) {
 206         pid_t pid;
 207
 208         pid = fork();
 209         ASSERT_OK_ERRNO(pid);
 210         if (pid == 0) {
 211                 _exit(EXIT_SUCCESS);
 212         } else {
 213                 int status;
 214
 215                 ASSERT_OK_EQ_ERRNO(waitpid(pid, &status, 0), pid);
 216                 ASSERT_OK_ZERO(pid_is_unwaited(pid));
 217         }
 218         ASSERT_OK_POSITIVE(pid_is_unwaited(getpid_cached()));
 219         ASSERT_FAIL(pid_is_unwaited(-1));
 220 }
 221
 222 TEST(pid_is_alive) {
 223         pid_t pid;
 224
 225         pid = fork();
 226         ASSERT_OK_ERRNO(pid);
 227         if (pid == 0) {
 228                 _exit(EXIT_SUCCESS);
 229         } else {
 230                 int status;
 231
 232                 ASSERT_OK_EQ_ERRNO(waitpid(pid, &status, 0), pid);
 233                 ASSERT_OK_ZERO(pid_is_alive(pid));
 234         }
 235         ASSERT_OK_POSITIVE(pid_is_alive(getpid_cached()));
 236         ASSERT_FAIL(pid_is_alive(-1));
 237 }
 238
 239 TEST(personality) {
 240         ASSERT_NOT_NULL(personality_to_string(PER_LINUX));
 241         ASSERT_NULL(personality_to_string(PERSONALITY_INVALID));
 242
 243         ASSERT_STREQ(personality_to_string(PER_LINUX), architecture_to_string(native_architecture()));
 244
 245         ASSERT_EQ(personality_from_string(personality_to_string(PER_LINUX)), (unsigned long) PER_LINUX);
 246         ASSERT_EQ(personality_from_string(architecture_to_string(native_architecture())), (unsigned long) PER_LINUX);
 247
 248 #ifdef __x86_64__
 249         ASSERT_STREQ(personality_to_string(PER_LINUX), "x86-64");
 250         ASSERT_STREQ(personality_to_string(PER_LINUX32), "x86");
 251
 252         ASSERT_EQ(personality_from_string("x86-64"), (unsigned long) PER_LINUX);
 253         ASSERT_EQ(personality_from_string("x86"), (unsigned long) PER_LINUX32);
 254         ASSERT_EQ(personality_from_string("ia64"), PERSONALITY_INVALID);
 255         ASSERT_EQ(personality_from_string(NULL), PERSONALITY_INVALID);
 256
 257         ASSERT_EQ(personality_from_string(personality_to_string(PER_LINUX32)), (unsigned long) PER_LINUX32);
 258 #endif
 259 }
 260
 261 TEST(pid_get_cmdline_harder) {
 262         char path[] = "/tmp/test-cmdlineXXXXXX";
 263         _cleanup_close_ int fd = -EBADF;
 264         _cleanup_free_ char *line = NULL;
 265         _cleanup_strv_free_ char **args = NULL;
 266         pid_t pid;
 267         int r;
 268
 269         if (geteuid() != 0) {
 270                 log_info("Skipping %s: not root", __func__);
 271                 return;
 272         }
 273
 274         if (!have_namespaces()) {
 275                 log_notice("Testing without namespaces, skipping %s", __func__);
 276                 return;
 277         }
 278
 279 #if HAVE_VALGRIND_VALGRIND_H
 280         /* valgrind patches open(/proc//cmdline)
 281          * so, test_pid_get_cmdline_harder fails always
 282          * See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
 283         if (RUNNING_ON_VALGRIND) {
 284                 log_info("Skipping %s: running on valgrind", __func__);
 285                 return;
 286         }
 287 #endif
 288
 289         pid = fork();
 290         if (pid > 0) {
 291                 siginfo_t si;
 292
 293                 (void) wait_for_terminate(pid, &si);
 294
 295                 ASSERT_EQ(si.si_code, CLD_EXITED);
 296                 ASSERT_OK_ZERO(si.si_status);
 297
 298                 return;
 299         }
 300
 301         ASSERT_OK_ZERO(pid);
 302
 303         r = detach_mount_namespace();
 304         if (r < 0) {
 305                 log_warning_errno(r, "detach mount namespace failed: %m");
 306                 if (!ERRNO_IS_PRIVILEGE(r))
 307                         ASSERT_OK(r);
 308                 return;
 309         }
 310
 311         fd = mkostemp(path, O_CLOEXEC);
 312         ASSERT_OK_ERRNO(fd);
 313
 314         /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
 315          * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
 316         if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
 317                 /* This happens under selinux… Abort the test in this case. */
 318                 log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
 319                 ASSERT_TRUE(IN_SET(errno, EPERM, EACCES));
 320                 return;
 321         }
 322
 323         /* Set RLIMIT_STACK to infinity to test we don't try to allocate unnecessarily large values to read
 324          * the cmdline. */
 325         if (setrlimit(RLIMIT_STACK, &RLIMIT_MAKE_CONST(RLIM_INFINITY)) < 0)
 326                 log_warning("Testing without RLIMIT_STACK=infinity");
 327
 328         ASSERT_OK_ERRNO(unlink(path));
 329
 330         ASSERT_OK_ERRNO(prctl(PR_SET_NAME, "testa"));
 331
 332         ASSERT_ERROR(pid_get_cmdline(0, SIZE_MAX, 0, &line), ENOENT);
 333
 334         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 335         log_debug("'%s'", line);
 336         ASSERT_STREQ(line, "[testa]");
 337         line = mfree(line);
 338
 339         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK | PROCESS_CMDLINE_QUOTE, &line));
 340         log_debug("'%s'", line);
 341         ASSERT_STREQ(line, "\"[testa]\""); /* quoting is enabled here */
 342         line = mfree(line);
 343
 344         ASSERT_OK(pid_get_cmdline(0, 0, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 345         log_debug("'%s'", line);
 346         ASSERT_STREQ(line, "");
 347         line = mfree(line);
 348
 349         ASSERT_OK(pid_get_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 350         ASSERT_STREQ(line, "…");
 351         line = mfree(line);
 352
 353         ASSERT_OK(pid_get_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 354         ASSERT_STREQ(line, "[…");
 355         line = mfree(line);
 356
 357         ASSERT_OK(pid_get_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 358         ASSERT_STREQ(line, "[t…");
 359         line = mfree(line);
 360
 361         ASSERT_OK(pid_get_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 362         ASSERT_STREQ(line, "[te…");
 363         line = mfree(line);
 364
 365         ASSERT_OK(pid_get_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 366         ASSERT_STREQ(line, "[tes…");
 367         line = mfree(line);
 368
 369         ASSERT_OK(pid_get_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 370         ASSERT_STREQ(line, "[test…");
 371         line = mfree(line);
 372
 373         ASSERT_OK(pid_get_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 374         ASSERT_STREQ(line, "[testa]");
 375         line = mfree(line);
 376
 377         ASSERT_OK(pid_get_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 378         ASSERT_STREQ(line, "[testa]");
 379         line = mfree(line);
 380
 381         ASSERT_OK(pid_get_cmdline_strv(0, PROCESS_CMDLINE_COMM_FALLBACK, &args));
 382         ASSERT_TRUE(strv_equal(args, STRV_MAKE("[testa]")));
 383         args = strv_free(args);
 384
 385         /* Test with multiple arguments that don't require quoting */
 386
 387         ASSERT_OK_EQ_ERRNO(write(fd, "foo\0bar", 8), 8);
 388
 389         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, 0, &line));
 390         log_debug("'%s'", line);
 391         ASSERT_STREQ(line, "foo bar");
 392         line = mfree(line);
 393
 394         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 395         ASSERT_STREQ(line, "foo bar");
 396         line = mfree(line);
 397
 398         ASSERT_OK(pid_get_cmdline_strv(0, PROCESS_CMDLINE_COMM_FALLBACK, &args));
 399         ASSERT_TRUE(strv_equal(args, STRV_MAKE("foo", "bar")));
 400         args = strv_free(args);
 401
 402         ASSERT_OK_EQ_ERRNO(write(fd, "quux", 4), 4);
 403         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, 0, &line));
 404         log_debug("'%s'", line);
 405         ASSERT_STREQ(line, "foo bar quux");
 406         line = mfree(line);
 407
 408         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 409         log_debug("'%s'", line);
 410         ASSERT_STREQ(line, "foo bar quux");
 411         line = mfree(line);
 412
 413         ASSERT_OK(pid_get_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 414         log_debug("'%s'", line);
 415         ASSERT_STREQ(line, "…");
 416         line = mfree(line);
 417
 418         ASSERT_OK(pid_get_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 419         log_debug("'%s'", line);
 420         ASSERT_STREQ(line, "f…");
 421         line = mfree(line);
 422
 423         ASSERT_OK(pid_get_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 424         log_debug("'%s'", line);
 425         ASSERT_STREQ(line, "fo…");
 426         line = mfree(line);
 427
 428         ASSERT_OK(pid_get_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 429         log_debug("'%s'", line);
 430         ASSERT_STREQ(line, "foo…");
 431         line = mfree(line);
 432
 433         ASSERT_OK(pid_get_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 434         log_debug("'%s'", line);
 435         ASSERT_STREQ(line, "foo …");
 436         line = mfree(line);
 437
 438         ASSERT_OK(pid_get_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 439         log_debug("'%s'", line);
 440         ASSERT_STREQ(line, "foo b…");
 441         line = mfree(line);
 442
 443         ASSERT_OK(pid_get_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 444         log_debug("'%s'", line);
 445         ASSERT_STREQ(line, "foo ba…");
 446         line = mfree(line);
 447
 448         ASSERT_OK(pid_get_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 449         log_debug("'%s'", line);
 450         ASSERT_STREQ(line, "foo bar…");
 451         line = mfree(line);
 452
 453         ASSERT_OK(pid_get_cmdline(0, 9, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 454         log_debug("'%s'", line);
 455         ASSERT_STREQ(line, "foo bar …");
 456         line = mfree(line);
 457
 458         ASSERT_OK(pid_get_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 459         log_debug("'%s'", line);
 460         ASSERT_STREQ(line, "foo bar q…");
 461         line = mfree(line);
 462
 463         ASSERT_OK(pid_get_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 464         log_debug("'%s'", line);
 465         ASSERT_STREQ(line, "foo bar qu…");
 466         line = mfree(line);
 467
 468         ASSERT_OK(pid_get_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 469         log_debug("'%s'", line);
 470         ASSERT_STREQ(line, "foo bar quux");
 471         line = mfree(line);
 472
 473         ASSERT_OK(pid_get_cmdline(0, 13, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 474         log_debug("'%s'", line);
 475         ASSERT_STREQ(line, "foo bar quux");
 476         line = mfree(line);
 477
 478         ASSERT_OK(pid_get_cmdline(0, 14, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 479         log_debug("'%s'", line);
 480         ASSERT_STREQ(line, "foo bar quux");
 481         line = mfree(line);
 482
 483         ASSERT_OK(pid_get_cmdline(0, 1000, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 484         log_debug("'%s'", line);
 485         ASSERT_STREQ(line, "foo bar quux");
 486         line = mfree(line);
 487
 488         ASSERT_OK(pid_get_cmdline_strv(0, PROCESS_CMDLINE_COMM_FALLBACK, &args));
 489         ASSERT_TRUE(strv_equal(args, STRV_MAKE("foo", "bar", "quux")));
 490         args = strv_free(args);
 491
 492         ASSERT_OK_ERRNO(ftruncate(fd, 0));
 493         ASSERT_OK_ERRNO(prctl(PR_SET_NAME, "aaaa bbbb cccc"));
 494
 495         ASSERT_ERROR(pid_get_cmdline(0, SIZE_MAX, 0, &line), ENOENT);
 496
 497         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 498         log_debug("'%s'", line);
 499         ASSERT_STREQ(line, "[aaaa bbbb cccc]");
 500         line = mfree(line);
 501
 502         ASSERT_OK(pid_get_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 503         log_debug("'%s'", line);
 504         ASSERT_STREQ(line, "[aaaa bbb…");
 505         line = mfree(line);
 506
 507         ASSERT_OK(pid_get_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 508         log_debug("'%s'", line);
 509         ASSERT_STREQ(line, "[aaaa bbbb…");
 510         line = mfree(line);
 511
 512         ASSERT_OK(pid_get_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line));
 513         log_debug("'%s'", line);
 514         ASSERT_STREQ(line, "[aaaa bbbb …");
 515         line = mfree(line);
 516
 517         ASSERT_OK(pid_get_cmdline_strv(0, PROCESS_CMDLINE_COMM_FALLBACK, &args));
 518         ASSERT_TRUE(strv_equal(args, STRV_MAKE("[aaaa bbbb cccc]")));
 519         args = strv_free(args);
 520
 521         /* Test with multiple arguments that do require quoting */
 522
 523 #define CMDLINE1 "foo\0'bar'\0\"bar$\"\0x y z\0!``\0"
 524 #define EXPECT1  "foo \"'bar'\" \"\\\"bar\\$\\\"\" \"x y z\" \"!\\`\\`\""
 525 #define EXPECT1p "foo $'\\'bar\\'' $'\"bar$\"' $'x y z' $'!``'"
 526 #define EXPECT1v STRV_MAKE("foo", "'bar'", "\"bar$\"", "x y z", "!``")
 527
 528         ASSERT_OK_ZERO_ERRNO(lseek(fd, SEEK_SET, 0));
 529         ASSERT_OK_EQ_ERRNO(write(fd, CMDLINE1, sizeof(CMDLINE1)), (ssize_t) sizeof(CMDLINE1));
 530         ASSERT_OK_ZERO_ERRNO(ftruncate(fd, sizeof(CMDLINE1)));
 531
 532         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line));
 533         log_debug("got: ==%s==", line);
 534         log_debug("exp: ==%s==", EXPECT1);
 535         ASSERT_STREQ(line, EXPECT1);
 536         line = mfree(line);
 537
 538         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line));
 539         log_debug("got: ==%s==", line);
 540         log_debug("exp: ==%s==", EXPECT1p);
 541         ASSERT_STREQ(line, EXPECT1p);
 542         line = mfree(line);
 543
 544         ASSERT_OK(pid_get_cmdline_strv(0, 0, &args));
 545         ASSERT_TRUE(strv_equal(args, EXPECT1v));
 546         args = strv_free(args);
 547
 548 #define CMDLINE2 "foo\0\1\2\3\0\0"
 549 #define EXPECT2  "foo \"\\001\\002\\003\""
 550 #define EXPECT2p "foo $'\\001\\002\\003'"
 551 #define EXPECT2v STRV_MAKE("foo", "\1\2\3")
 552
 553         ASSERT_OK_ZERO_ERRNO(lseek(fd, SEEK_SET, 0));
 554         ASSERT_OK_EQ_ERRNO(write(fd, CMDLINE2, sizeof(CMDLINE2)), (ssize_t) sizeof(CMDLINE2));
 555         ASSERT_OK_ZERO_ERRNO(ftruncate(fd, sizeof CMDLINE2));
 556
 557         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line));
 558         log_debug("got: ==%s==", line);
 559         log_debug("exp: ==%s==", EXPECT2);
 560         ASSERT_STREQ(line, EXPECT2);
 561         line = mfree(line);
 562
 563         ASSERT_OK(pid_get_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line));
 564         log_debug("got: ==%s==", line);
 565         log_debug("exp: ==%s==", EXPECT2p);
 566         ASSERT_STREQ(line, EXPECT2p);
 567         line = mfree(line);
 568
 569         ASSERT_OK(pid_get_cmdline_strv(0, 0, &args));
 570         ASSERT_TRUE(strv_equal(args, EXPECT2v));
 571         args = strv_free(args);
 572
 573         safe_close(fd);
 574         _exit(EXIT_SUCCESS);
 575 }
 576
 577 TEST(getpid_cached) {
 578         siginfo_t si;
 579         pid_t a, b, c, d, e, f, child;
 580
 581         a = getpid();
 582         b = getpid_cached();
 583         c = getpid();
 584
 585         ASSERT_EQ(a, b);
 586         ASSERT_EQ(a, c);
 587
 588         child = fork();
 589         ASSERT_OK_ERRNO(child);
 590
 591         if (child == 0) {
 592                 /* In child */
 593                 a = getpid();
 594                 b = getpid_cached();
 595                 c = getpid();
 596
 597                 ASSERT_EQ(a, b);
 598                 ASSERT_EQ(a, c);
 599                 _exit(EXIT_SUCCESS);
 600         }
 601
 602         d = getpid();
 603         e = getpid_cached();
 604         f = getpid();
 605
 606         ASSERT_EQ(a, d);
 607         ASSERT_EQ(a, e);
 608         ASSERT_EQ(a, f);
 609
 610         ASSERT_OK(wait_for_terminate(child, &si));
 611         ASSERT_EQ(si.si_status, 0);
 612         ASSERT_EQ(si.si_code, CLD_EXITED);
 613 }
 614
 615 TEST(getpid_measure) {
 616         usec_t t, q;
 617
 618         unsigned long long iterations = slow_tests_enabled() ? 1000000 : 1000;
 619
 620         log_info("/* %s (%llu iterations) */", __func__, iterations);
 621
 622         t = now(CLOCK_MONOTONIC);
 623         for (unsigned long long i = 0; i < iterations; i++)
 624                 (void) getpid();
 625         q = now(CLOCK_MONOTONIC) - t;
 626
 627         log_info(" glibc getpid(): %lf μs each", (double) q / iterations);
 628
 629         iterations *= 50; /* _cached() is about 50 times faster, so we need more iterations */
 630
 631         t = now(CLOCK_MONOTONIC);
 632         for (unsigned long long i = 0; i < iterations; i++)
 633                 (void) getpid_cached();
 634         q = now(CLOCK_MONOTONIC) - t;
 635
 636         log_info("getpid_cached(): %lf μs each", (double) q / iterations);
 637 }
 638
 639 TEST(safe_fork) {
 640         siginfo_t status;
 641         pid_t pid;
 642         int r;
 643
 644         BLOCK_SIGNALS(SIGCHLD);
 645
 646         r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG_SIGTERM|FORK_REARRANGE_STDIO|FORK_REOPEN_LOG, &pid);
 647         ASSERT_OK(r);
 648
 649         if (r == 0) {
 650                 /* child */
 651                 usleep_safe(100 * USEC_PER_MSEC);
 652
 653                 _exit(88);
 654         }
 655
 656         ASSERT_OK(wait_for_terminate(pid, &status));
 657         ASSERT_EQ(status.si_code, CLD_EXITED);
 658         ASSERT_EQ(status.si_status, 88);
 659
 660         _cleanup_(pidref_done) PidRef child = PIDREF_NULL;
 661         r = pidref_safe_fork("(test-child)", FORK_DETACH, &child);
 662         if (r == 0) {
 663                 /* Don't freeze so this doesn't linger around forever in case something goes wrong. */
 664                 usleep_safe(100 * USEC_PER_SEC);
 665                 _exit(EXIT_SUCCESS);
 666         }
 667
 668         ASSERT_OK_POSITIVE(r);
 669         ASSERT_GT(child.pid, 0);
 670         ASSERT_OK(pidref_get_ppid(&child, &pid));
 671         ASSERT_OK(pidref_kill(&child, SIGKILL));
 672
 673         if (is_reaper_process())
 674                 ASSERT_EQ(pid, getpid_cached());
 675         else
 676                 ASSERT_NE(pid, getpid_cached());
 677 }
 678
 679 TEST(pid_to_ptr) {
 680         ASSERT_EQ(PTR_TO_PID(NULL), 0);
 681         ASSERT_NULL(PID_TO_PTR(0));
 682
 683         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(1)), 1);
 684         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(2)), 2);
 685         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(-1)), -1);
 686         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(-2)), -2);
 687
 688         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(INT16_MAX)), INT16_MAX);
 689         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(INT16_MIN)), INT16_MIN);
 690
 691         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(INT32_MAX)), INT32_MAX);
 692         ASSERT_EQ(PTR_TO_PID(PID_TO_PTR(INT32_MIN)), INT32_MIN);
 693 }
 694
 695 static void test_ioprio_class_from_to_string_one(const char *val, int expected, int normalized) {
 696         ASSERT_EQ(ioprio_class_from_string(val), expected);
 697         if (expected >= 0) {
 698                 _cleanup_free_ char *s = NULL;
 699                 unsigned ret;
 700                 int combined;
 701
 702                 ASSERT_OK_ZERO(ioprio_class_to_string_alloc(expected, &s));
 703                 /* We sometimes get a class number and sometimes a name back */
 704                 ASSERT_TRUE(streq(s, val) || safe_atou(val, &ret) == 0);
 705
 706                 /* Make sure normalization works, i.e. NONE → BE gets normalized */
 707                 combined = ioprio_normalize(ioprio_prio_value(expected, 0));
 708                 ASSERT_EQ(ioprio_prio_class(combined), normalized);
 709                 ASSERT_TRUE(expected != IOPRIO_CLASS_NONE || ioprio_prio_data(combined) == 4);
 710         }
 711 }
 712
 713 TEST(ioprio_class_from_to_string) {
 714         test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE, IOPRIO_CLASS_BE);
 715         test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT, IOPRIO_CLASS_RT);
 716         test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE, IOPRIO_CLASS_BE);
 717         test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE, IOPRIO_CLASS_IDLE);
 718         test_ioprio_class_from_to_string_one("0", IOPRIO_CLASS_NONE, IOPRIO_CLASS_BE);
 719         test_ioprio_class_from_to_string_one("1", 1, 1);
 720         test_ioprio_class_from_to_string_one("7", 7, 7);
 721         test_ioprio_class_from_to_string_one("8", -EINVAL, -EINVAL);
 722         test_ioprio_class_from_to_string_one("9", -EINVAL, -EINVAL);
 723         test_ioprio_class_from_to_string_one("-1", -EINVAL, -EINVAL);
 724 }
 725
 726 TEST(setpriority_closest) {
 727         int r;
 728
 729         r = safe_fork("(test-setprio)",
 730                       FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG_SIGTERM|FORK_WAIT|FORK_LOG|FORK_REOPEN_LOG, NULL);
 731         ASSERT_OK(r);
 732
 733         if (r == 0) {
 734                 bool full_test;
 735                 int p, q;
 736                 /* child */
 737
 738                 /* rlimit of 30 equals nice level of -10 */
 739                 if (setrlimit(RLIMIT_NICE, &RLIMIT_MAKE_CONST(30)) < 0) {
 740                         /* If this fails we are probably unprivileged or in a userns of some kind, let's skip
 741                          * the full test */
 742                         if (!ERRNO_IS_PRIVILEGE(errno))
 743                                 ASSERT_OK_ERRNO(-1);
 744                         full_test = false;
 745                 } else {
 746                         /* However, if the hard limit was above 30, setrlimit would succeed unprivileged, so
 747                          * check if the UID/GID can be changed before enabling the full test. */
 748                         if (setresgid(GID_NOBODY, GID_NOBODY, GID_NOBODY) < 0) {
 749                                 /* If the nobody user does not exist (user namespace) we get EINVAL. */
 750                                 if (!ERRNO_IS_PRIVILEGE(errno) && errno != EINVAL)
 751                                         ASSERT_OK_ERRNO(-1);
 752                                 full_test = false;
 753                         } else if (setresuid(UID_NOBODY, UID_NOBODY, UID_NOBODY) < 0) {
 754                                 /* If the nobody user does not exist (user namespace) we get EINVAL. */
 755                                 if (!ERRNO_IS_PRIVILEGE(errno) && errno != EINVAL)
 756                                         ASSERT_OK_ERRNO(-1);
 757                                 full_test = false;
 758                         } else
 759                                 full_test = true;
 760                 }
 761
 762                 errno = 0;
 763                 p = getpriority(PRIO_PROCESS, 0);
 764                 ASSERT_EQ(errno, 0);
 765
 766                 /* It should always be possible to set our nice level to the current one */
 767                 ASSERT_OK_POSITIVE(setpriority_closest(p));
 768
 769                 errno = 0;
 770                 q = getpriority(PRIO_PROCESS, 0);
 771                 ASSERT_EQ(errno, 0);
 772                 ASSERT_EQ(p, q);
 773
 774                 /* It should also be possible to set the nice level to one higher */
 775                 if (p < PRIO_MAX-1) {
 776                         ASSERT_OK_POSITIVE(setpriority_closest(++p));
 777
 778                         errno = 0;
 779                         q = getpriority(PRIO_PROCESS, 0);
 780                         ASSERT_EQ(errno, 0);
 781                         ASSERT_EQ(p, q);
 782                 }
 783
 784                 /* It should also be possible to set the nice level to two higher */
 785                 if (p < PRIO_MAX-1) {
 786                         ASSERT_OK_POSITIVE(setpriority_closest(++p));
 787
 788                         errno = 0;
 789                         q = getpriority(PRIO_PROCESS, 0);
 790                         ASSERT_EQ(errno, 0);
 791                         ASSERT_EQ(p, q);
 792                 }
 793
 794                 if (full_test) {
 795                         /* These two should work, given the RLIMIT_NICE we set above */
 796                         ASSERT_OK_POSITIVE(setpriority_closest(-10));
 797                         errno = 0;
 798                         q = getpriority(PRIO_PROCESS, 0);
 799                         ASSERT_EQ(errno, 0);
 800                         ASSERT_EQ(q, -10);
 801
 802                         ASSERT_OK_POSITIVE(setpriority_closest(-9));
 803                         errno = 0;
 804                         q = getpriority(PRIO_PROCESS, 0);
 805                         ASSERT_EQ(errno, 0);
 806                         ASSERT_EQ(q, -9);
 807
 808                         /* This should succeed but should be clamped to the limit */
 809                         ASSERT_OK_ZERO(setpriority_closest(-11));
 810                         errno = 0;
 811                         q = getpriority(PRIO_PROCESS, 0);
 812                         ASSERT_EQ(errno, 0);
 813                         ASSERT_EQ(q, -10);
 814
 815                         ASSERT_OK_POSITIVE(setpriority_closest(-8));
 816                         errno = 0;
 817                         q = getpriority(PRIO_PROCESS, 0);
 818                         ASSERT_EQ(errno, 0);
 819                         ASSERT_EQ(q, -8);
 820
 821                         /* This should succeed but should be clamped to the limit */
 822                         ASSERT_OK_ZERO(setpriority_closest(-12));
 823                         errno = 0;
 824                         q = getpriority(PRIO_PROCESS, 0);
 825                         ASSERT_EQ(errno, 0);
 826                         ASSERT_EQ(q, -10);
 827                 }
 828
 829                 _exit(EXIT_SUCCESS);
 830         }
 831 }
 832
 833 TEST(pid_get_ppid) {
 834         uint64_t limit;
 835         int r;
 836
 837         ASSERT_ERROR(pid_get_ppid(1, NULL), EADDRNOTAVAIL);
 838
 839         /* the process with the PID above the global limit definitely doesn't exist. Verify that */
 840         ASSERT_OK(procfs_get_pid_max(&limit));
 841         log_debug("kernel.pid_max = %"PRIu64, limit);
 842
 843         if (limit < INT_MAX) {
 844                 r = pid_get_ppid(limit + 1, NULL);
 845                 log_debug_errno(r, "get_process_limit(%"PRIu64") → %d/%m", limit + 1, r);
 846                 assert(r == -ESRCH);
 847         }
 848
 849         for (pid_t pid = 0;;) {
 850                 _cleanup_free_ char *c1 = NULL, *c2 = NULL;
 851                 pid_t ppid;
 852
 853                 r = pid_get_ppid(pid, &ppid);
 854                 if (r == -EADDRNOTAVAIL) {
 855                         log_info("No further parent PID");
 856                         break;
 857                 }
 858
 859                 ASSERT_OK(r);
 860
 861                 ASSERT_OK(pid_get_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c1));
 862                 ASSERT_OK(pid_get_cmdline(ppid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c2));
 863
 864                 log_info("Parent of " PID_FMT " (%s) is " PID_FMT " (%s).", pid, c1, ppid, c2);
 865
 866                 pid = ppid;
 867         }
 868
 869         /* the same via pidref */
 870         _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
 871         ASSERT_OK(pidref_set_self(&pidref));
 872         for (;;) {
 873                 _cleanup_free_ char *c1 = NULL, *c2 = NULL;
 874                 _cleanup_(pidref_done) PidRef parent = PIDREF_NULL;
 875                 r = pidref_get_ppid_as_pidref(&pidref, &parent);
 876                 if (r == -EADDRNOTAVAIL) {
 877                         log_info("No further parent PID");
 878                         break;
 879                 }
 880
 881                 ASSERT_OK(r);
 882
 883                 ASSERT_OK(pidref_get_cmdline(&pidref, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c1));
 884                 ASSERT_OK(pidref_get_cmdline(&parent, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c2));
 885
 886                 log_info("Parent of " PID_FMT " (%s) is " PID_FMT " (%s).", pidref.pid, c1, parent.pid, c2);
 887
 888                 pidref_done(&pidref);
 889                 pidref = TAKE_PIDREF(parent);
 890         }
 891 }
 892
 893 TEST(set_oom_score_adjust) {
 894         int a, b, r;
 895
 896         ASSERT_OK(get_oom_score_adjust(&a));
 897
 898         r = set_oom_score_adjust(OOM_SCORE_ADJ_MIN);
 899         if (!ERRNO_IS_PRIVILEGE(r))
 900                 ASSERT_OK(r);
 901
 902         if (r >= 0) {
 903                 ASSERT_OK(get_oom_score_adjust(&b));
 904                 ASSERT_EQ(b, OOM_SCORE_ADJ_MIN);
 905         }
 906
 907         ASSERT_OK(set_oom_score_adjust(a));
 908         ASSERT_OK(get_oom_score_adjust(&b));
 909         ASSERT_EQ(b, a);
 910 }
 911
 912 static void* dummy_thread(void *p) {
 913         int fd = PTR_TO_FD(p);
 914         char x;
 915
 916         /* let main thread know we are ready */
 917         ASSERT_OK_EQ_ERRNO(write(fd, &(const char) { 'x' }, 1), 1);
 918
 919         /* wait for the main thread to tell us to shut down */
 920         ASSERT_OK_EQ_ERRNO(read(fd, &x, 1), 1);
 921         return NULL;
 922 }
 923
 924 TEST(get_process_threads) {
 925         int r;
 926
 927         /* Run this test in a child, so that we can guarantee there's exactly one thread around in the child */
 928         r = safe_fork("(nthreads)", FORK_RESET_SIGNALS|FORK_DEATHSIG_SIGTERM|FORK_WAIT|FORK_LOG, NULL);
 929         ASSERT_OK(r);
 930
 931         if (r == 0) {
 932                 _cleanup_close_pair_ int pfd[2] = EBADF_PAIR, ppfd[2] = EBADF_PAIR;
 933                 pthread_t t, tt;
 934                 char x;
 935
 936                 ASSERT_OK_ERRNO(socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, pfd));
 937                 ASSERT_OK_ERRNO(socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, ppfd));
 938
 939                 ASSERT_OK_EQ(get_process_threads(0), 1);
 940                 ASSERT_OK_ZERO_ERRNO(pthread_create(&t, NULL, &dummy_thread, FD_TO_PTR(pfd[0])));
 941                 ASSERT_OK_EQ_ERRNO(read(pfd[1], &x, 1), 1);
 942                 ASSERT_OK_EQ(get_process_threads(0), 2);
 943                 ASSERT_OK_ZERO_ERRNO(pthread_create(&tt, NULL, &dummy_thread, FD_TO_PTR(ppfd[0])));
 944                 ASSERT_OK_EQ_ERRNO(read(ppfd[1], &x, 1), 1);
 945                 ASSERT_OK_EQ(get_process_threads(0), 3);
 946
 947                 ASSERT_OK_EQ_ERRNO(write(pfd[1], &(const char) { 'x' }, 1), 1);
 948                 ASSERT_OK_ZERO_ERRNO(pthread_join(t, NULL));
 949
 950                 /* the value reported via /proc/ is decreased asynchronously, and there appears to be no nice
 951                  * way to sync on it. Hence we do the weak >= 2 check, even though == 2 is what we'd actually
 952                  * like to check here */
 953                 r = get_process_threads(0);
 954                 ASSERT_OK(r);
 955                 ASSERT_GE(r, 2);
 956
 957                 ASSERT_OK_EQ_ERRNO(write(ppfd[1], &(const char) { 'x' }, 1), 1);
 958                 ASSERT_OK_ZERO_ERRNO(pthread_join(tt, NULL));
 959
 960                 /* similar here */
 961                 r = get_process_threads(0);
 962                 ASSERT_OK(r);
 963                 ASSERT_GE(r, 1);
 964
 965                 _exit(EXIT_SUCCESS);
 966         }
 967 }
 968
 969 TEST(is_reaper_process) {
 970         int r;
 971
 972         r = safe_fork("(regular)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_WAIT, NULL);
 973         ASSERT_OK(r);
 974         if (r == 0) {
 975                 /* child */
 976
 977                 ASSERT_OK_ZERO(is_reaper_process());
 978                 _exit(EXIT_SUCCESS);
 979         }
 980
 981         r = safe_fork("(newpid)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_WAIT, NULL);
 982         ASSERT_OK(r);
 983         if (r == 0) {
 984                 /* child */
 985
 986                 if (unshare(CLONE_NEWPID) < 0) {
 987                         if (ERRNO_IS_PRIVILEGE(errno) || ERRNO_IS_NOT_SUPPORTED(errno)) {
 988                                 log_notice("Skipping CLONE_NEWPID reaper check, lacking privileges/support");
 989                                 _exit(EXIT_SUCCESS);
 990                         }
 991                 }
 992
 993                 r = safe_fork("(newpid1)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_WAIT, NULL);
 994                 ASSERT_OK(r);
 995                 if (r == 0) {
 996                         /* grandchild, which is PID1 in a pidns */
 997                         ASSERT_OK_EQ(getpid_cached(), 1);
 998                         ASSERT_OK_POSITIVE(is_reaper_process());
 999                         _exit(EXIT_SUCCESS);
1000                 }
1001
1002                 _exit(EXIT_SUCCESS);
1003         }
1004
1005         r = safe_fork("(subreaper)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_WAIT, NULL);
1006         ASSERT_OK(r);
1007         if (r == 0) {
1008                 /* child */
1009                 ASSERT_OK(make_reaper_process(true));
1010
1011                 ASSERT_OK_POSITIVE(is_reaper_process());
1012                 _exit(EXIT_SUCCESS);
1013         }
1014 }
1015
1016 TEST(pid_get_start_time) {
1017         _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
1018
1019         ASSERT_OK(pidref_set_self(&pidref));
1020
1021         usec_t start_time;
1022         ASSERT_OK(pidref_get_start_time(&pidref, &start_time));
1023         log_info("our starttime: " USEC_FMT, start_time);
1024
1025         _cleanup_(pidref_done_sigkill_wait) PidRef child = PIDREF_NULL;
1026
1027         ASSERT_OK_POSITIVE(pidref_safe_fork("(stub)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_FREEZE, &child));
1028
1029         usec_t start_time2;
1030         ASSERT_OK(pidref_get_start_time(&child, &start_time2));
1031
1032         log_info("child starttime: " USEC_FMT, start_time2);
1033
1034         ASSERT_GE(start_time2, start_time);
1035 }
1036
1037 TEST(pidref_from_same_root_fs) {
1038         int r;
1039
1040         _cleanup_(pidref_done) PidRef pid1 = PIDREF_NULL, self = PIDREF_NULL;
1041
1042         ASSERT_OK(pidref_set_self(&self));
1043         ASSERT_OK(pidref_set_pid(&pid1, 1));
1044
1045         ASSERT_OK_POSITIVE(pidref_from_same_root_fs(&self, &self));
1046         ASSERT_OK_POSITIVE(pidref_from_same_root_fs(&pid1, &pid1));
1047
1048         r = pidref_from_same_root_fs(&pid1, &self);
1049         if (ERRNO_IS_NEG_PRIVILEGE(r))
1050                 return (void) log_tests_skipped("skipping pidref_from_same_root_fs() test, lacking privileged.");
1051         ASSERT_OK(r);
1052         log_info("PID1 and us have the same rootfs: %s", yes_no(r));
1053
1054         int q = pidref_from_same_root_fs(&self, &pid1);
1055         ASSERT_OK(q);
1056         ASSERT_EQ(r, q);
1057
1058         _cleanup_(pidref_done_sigkill_wait) PidRef child1 = PIDREF_NULL;
1059         ASSERT_OK(pidref_safe_fork("(child1)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_FREEZE, &child1));
1060         ASSERT_OK_POSITIVE(pidref_from_same_root_fs(&self, &child1));
1061
1062         _cleanup_close_ int efd = eventfd(0, EFD_CLOEXEC);
1063         ASSERT_OK_ERRNO(efd);
1064
1065         _cleanup_(pidref_done_sigkill_wait) PidRef child2 = PIDREF_NULL;
1066         r = pidref_safe_fork("(child2)", FORK_RESET_SIGNALS|FORK_REOPEN_LOG, &child2);
1067         ASSERT_OK(r);
1068
1069         if (r == 0) {
1070                 ASSERT_OK_ERRNO(chroot("/usr"));
1071                 uint64_t u = 1;
1072
1073                 ASSERT_OK_EQ_ERRNO(write(efd, &u, sizeof(u)), (ssize_t) sizeof(u));
1074                 freeze();
1075         }
1076
1077         uint64_t u;
1078         ASSERT_OK_EQ_ERRNO(read(efd, &u, sizeof(u)), (ssize_t) sizeof(u));
1079
1080         ASSERT_OK_ZERO(pidref_from_same_root_fs(&self, &child2));
1081         ASSERT_OK_ZERO(pidref_from_same_root_fs(&child2, &self));
1082 }
1083
1084 TEST(pidfd_get_inode_id_self_cached) {
1085         int r;
1086
1087         log_info("pid=" PID_FMT, getpid_cached());
1088
1089         uint64_t id;
1090         r = pidfd_get_inode_id_self_cached(&id);
1091         if (ERRNO_IS_NEG_NOT_SUPPORTED(r))
1092                 log_info("pidfdid not supported");
1093         else {
1094                 assert(r >= 0);
1095                 log_info("pidfdid=%" PRIu64, id);
1096         }
1097 }
1098
1099 static int intro(void) {
1100         log_show_color(true);
1101         return EXIT_SUCCESS;
1102 }
1103
1104 DEFINE_TEST_MAIN_WITH_INTRO(LOG_INFO, intro);