src/test/test-process-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <sched.h>
   5 #include <sys/mount.h>
   6 #include <sys/personality.h>
   7 #include <sys/prctl.h>
   8 #include <sys/stat.h>
   9 #include <sys/types.h>
  10 #include <sys/wait.h>
  11 #include <unistd.h>
  12 #if HAVE_VALGRIND_VALGRIND_H
  13 #include <valgrind/valgrind.h>
  14 #endif
  15
  16 #include "alloc-util.h"
  17 #include "architecture.h"
  18 #include "fd-util.h"
  19 #include "log.h"
  20 #include "macro.h"
  21 #include "missing_sched.h"
  22 #include "missing_syscall.h"
  23 #include "parse-util.h"
  24 #include "process-util.h"
  25 #include "signal-util.h"
  26 #include "stdio-util.h"
  27 #include "string-util.h"
  28 #include "terminal-util.h"
  29 #include "test-helper.h"
  30 #include "tests.h"
  31 #include "util.h"
  32 #include "virt.h"
  33
  34 static void test_get_process_comm(pid_t pid) {
  35         struct stat st;
  36         _cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
  37         _cleanup_free_ char *env = NULL;
  38         char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
  39         pid_t e;
  40         uid_t u;
  41         gid_t g;
  42         dev_t h;
  43         int r;
  44
  45         xsprintf(path, "/proc/"PID_FMT"/comm", pid);
  46
  47         if (stat(path, &st) == 0) {
  48                 assert_se(get_process_comm(pid, &a) >= 0);
  49                 log_info("PID"PID_FMT" comm: '%s'", pid, a);
  50         } else
  51                 log_warning("%s not exist.", path);
  52
  53         assert_se(get_process_cmdline(pid, 0, PROCESS_CMDLINE_COMM_FALLBACK, &c) >= 0);
  54         log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
  55
  56         assert_se(get_process_cmdline(pid, 8, 0, &d) >= 0);
  57         log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
  58
  59         free(d);
  60         assert_se(get_process_cmdline(pid, 1, 0, &d) >= 0);
  61         log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
  62
  63         assert_se(get_process_ppid(pid, &e) >= 0);
  64         log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
  65         assert_se(pid == 1 ? e == 0 : e > 0);
  66
  67         assert_se(is_kernel_thread(pid) == 0 || pid != 1);
  68
  69         r = get_process_exe(pid, &f);
  70         assert_se(r >= 0 || r == -EACCES);
  71         log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
  72
  73         assert_se(get_process_uid(pid, &u) == 0);
  74         log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
  75
  76         assert_se(get_process_gid(pid, &g) == 0);
  77         log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
  78
  79         r = get_process_environ(pid, &env);
  80         assert_se(r >= 0 || r == -EACCES);
  81         log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
  82
  83         if (!detect_container())
  84                 assert_se(get_ctty_devnr(pid, &h) == -ENXIO || pid != 1);
  85
  86         (void) getenv_for_pid(pid, "PATH", &i);
  87         log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
  88 }
  89
  90 static void test_get_process_comm_escape_one(const char *input, const char *output) {
  91         _cleanup_free_ char *n = NULL;
  92
  93         log_info("input: <%s> — output: <%s>", input, output);
  94
  95         assert_se(prctl(PR_SET_NAME, input) >= 0);
  96         assert_se(get_process_comm(0, &n) >= 0);
  97
  98         log_info("got: <%s>", n);
  99
 100         assert_se(streq_ptr(n, output));
 101 }
 102
 103 static void test_get_process_comm_escape(void) {
 104         _cleanup_free_ char *saved = NULL;
 105
 106         assert_se(get_process_comm(0, &saved) >= 0);
 107
 108         test_get_process_comm_escape_one("", "");
 109         test_get_process_comm_escape_one("foo", "foo");
 110         test_get_process_comm_escape_one("012345678901234", "012345678901234");
 111         test_get_process_comm_escape_one("0123456789012345", "012345678901234");
 112         test_get_process_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
 113         test_get_process_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
 114         test_get_process_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
 115         test_get_process_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
 116         test_get_process_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 117         test_get_process_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 118
 119         assert_se(prctl(PR_SET_NAME, saved) >= 0);
 120 }
 121
 122 static void test_pid_is_unwaited(void) {
 123         pid_t pid;
 124
 125         pid = fork();
 126         assert_se(pid >= 0);
 127         if (pid == 0) {
 128                 _exit(EXIT_SUCCESS);
 129         } else {
 130                 int status;
 131
 132                 waitpid(pid, &status, 0);
 133                 assert_se(!pid_is_unwaited(pid));
 134         }
 135         assert_se(pid_is_unwaited(getpid_cached()));
 136         assert_se(!pid_is_unwaited(-1));
 137 }
 138
 139 static void test_pid_is_alive(void) {
 140         pid_t pid;
 141
 142         pid = fork();
 143         assert_se(pid >= 0);
 144         if (pid == 0) {
 145                 _exit(EXIT_SUCCESS);
 146         } else {
 147                 int status;
 148
 149                 waitpid(pid, &status, 0);
 150                 assert_se(!pid_is_alive(pid));
 151         }
 152         assert_se(pid_is_alive(getpid_cached()));
 153         assert_se(!pid_is_alive(-1));
 154 }
 155
 156 static void test_personality(void) {
 157
 158         assert_se(personality_to_string(PER_LINUX));
 159         assert_se(!personality_to_string(PERSONALITY_INVALID));
 160
 161         assert_se(streq(personality_to_string(PER_LINUX), architecture_to_string(native_architecture())));
 162
 163         assert_se(personality_from_string(personality_to_string(PER_LINUX)) == PER_LINUX);
 164         assert_se(personality_from_string(architecture_to_string(native_architecture())) == PER_LINUX);
 165
 166 #ifdef __x86_64__
 167         assert_se(streq_ptr(personality_to_string(PER_LINUX), "x86-64"));
 168         assert_se(streq_ptr(personality_to_string(PER_LINUX32), "x86"));
 169
 170         assert_se(personality_from_string("x86-64") == PER_LINUX);
 171         assert_se(personality_from_string("x86") == PER_LINUX32);
 172         assert_se(personality_from_string("ia64") == PERSONALITY_INVALID);
 173         assert_se(personality_from_string(NULL) == PERSONALITY_INVALID);
 174
 175         assert_se(personality_from_string(personality_to_string(PER_LINUX32)) == PER_LINUX32);
 176 #endif
 177 }
 178
 179 static void test_get_process_cmdline_harder(void) {
 180         char path[] = "/tmp/test-cmdlineXXXXXX";
 181         _cleanup_close_ int fd = -1;
 182         _cleanup_free_ char *line = NULL;
 183         pid_t pid;
 184
 185         if (geteuid() != 0) {
 186                 log_info("Skipping %s: not root", __func__);
 187                 return;
 188         }
 189
 190         if (!have_namespaces()) {
 191                 log_notice("Testing without namespaces, skipping %s", __func__);
 192                 return;
 193         }
 194
 195 #if HAVE_VALGRIND_VALGRIND_H
 196         /* valgrind patches open(/proc//cmdline)
 197          * so, test_get_process_cmdline_harder fails always
 198          * See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
 199         if (RUNNING_ON_VALGRIND) {
 200                 log_info("Skipping %s: running on valgrind", __func__);
 201                 return;
 202         }
 203 #endif
 204
 205         pid = fork();
 206         if (pid > 0) {
 207                 siginfo_t si;
 208
 209                 (void) wait_for_terminate(pid, &si);
 210
 211                 assert_se(si.si_code == CLD_EXITED);
 212                 assert_se(si.si_status == 0);
 213
 214                 return;
 215         }
 216
 217         assert_se(pid == 0);
 218         assert_se(unshare(CLONE_NEWNS) >= 0);
 219
 220         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
 221                 log_warning_errno(errno, "mount(..., \"/\", MS_SLAVE|MS_REC, ...) failed: %m");
 222                 assert_se(IN_SET(errno, EPERM, EACCES));
 223                 return;
 224         }
 225
 226         fd = mkostemp(path, O_CLOEXEC);
 227         assert_se(fd >= 0);
 228
 229         /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
 230          * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
 231         if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
 232                 /* This happens under selinux… Abort the test in this case. */
 233                 log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
 234                 assert_se(IN_SET(errno, EPERM, EACCES));
 235                 return;
 236         }
 237
 238         assert_se(unlink(path) >= 0);
 239
 240         assert_se(prctl(PR_SET_NAME, "testa") >= 0);
 241
 242         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) == -ENOENT);
 243
 244         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 245         assert_se(streq(line, "[testa]"));
 246         line = mfree(line);
 247
 248         assert_se(get_process_cmdline(getpid_cached(), 0, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 249         log_info("'%s'", line);
 250         assert_se(streq(line, ""));
 251         line = mfree(line);
 252
 253         assert_se(get_process_cmdline(getpid_cached(), 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 254         assert_se(streq(line, "…"));
 255         line = mfree(line);
 256
 257         assert_se(get_process_cmdline(getpid_cached(), 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 258         assert_se(streq(line, "[…"));
 259         line = mfree(line);
 260
 261         assert_se(get_process_cmdline(getpid_cached(), 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 262         assert_se(streq(line, "[t…"));
 263         line = mfree(line);
 264
 265         assert_se(get_process_cmdline(getpid_cached(), 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 266         assert_se(streq(line, "[te…"));
 267         line = mfree(line);
 268
 269         assert_se(get_process_cmdline(getpid_cached(), 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 270         assert_se(streq(line, "[tes…"));
 271         line = mfree(line);
 272
 273         assert_se(get_process_cmdline(getpid_cached(), 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 274         assert_se(streq(line, "[test…"));
 275         line = mfree(line);
 276
 277         assert_se(get_process_cmdline(getpid_cached(), 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 278         assert_se(streq(line, "[testa]"));
 279         line = mfree(line);
 280
 281         assert_se(get_process_cmdline(getpid_cached(), 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 282         assert_se(streq(line, "[testa]"));
 283         line = mfree(line);
 284
 285         assert_se(write(fd, "foo\0bar", 8) == 8);
 286
 287         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) >= 0);
 288         log_info("'%s'", line);
 289         assert_se(streq(line, "foo bar"));
 290         line = mfree(line);
 291
 292         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 293         assert_se(streq(line, "foo bar"));
 294         line = mfree(line);
 295
 296         assert_se(write(fd, "quux", 4) == 4);
 297         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) >= 0);
 298         log_info("'%s'", line);
 299         assert_se(streq(line, "foo bar quux"));
 300         line = mfree(line);
 301
 302         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 303         assert_se(streq(line, "foo bar quux"));
 304         line = mfree(line);
 305
 306         assert_se(get_process_cmdline(getpid_cached(), 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 307         assert_se(streq(line, "…"));
 308         line = mfree(line);
 309
 310         assert_se(get_process_cmdline(getpid_cached(), 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 311         assert_se(streq(line, "f…"));
 312         line = mfree(line);
 313
 314         assert_se(get_process_cmdline(getpid_cached(), 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 315         assert_se(streq(line, "fo…"));
 316         line = mfree(line);
 317
 318         assert_se(get_process_cmdline(getpid_cached(), 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 319         assert_se(streq(line, "foo…"));
 320         line = mfree(line);
 321
 322         assert_se(get_process_cmdline(getpid_cached(), 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 323         assert_se(streq(line, "foo …"));
 324         line = mfree(line);
 325
 326         assert_se(get_process_cmdline(getpid_cached(), 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 327         assert_se(streq(line, "foo b…"));
 328         line = mfree(line);
 329
 330         assert_se(get_process_cmdline(getpid_cached(), 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 331         assert_se(streq(line, "foo ba…"));
 332         line = mfree(line);
 333
 334         assert_se(get_process_cmdline(getpid_cached(), 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 335         assert_se(streq(line, "foo bar…"));
 336         line = mfree(line);
 337
 338         assert_se(get_process_cmdline(getpid_cached(), 9, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 339         assert_se(streq(line, "foo bar …"));
 340         line = mfree(line);
 341
 342         assert_se(get_process_cmdline(getpid_cached(), 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 343         assert_se(streq(line, "foo bar q…"));
 344         line = mfree(line);
 345
 346         assert_se(get_process_cmdline(getpid_cached(), 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 347         assert_se(streq(line, "foo bar qu…"));
 348         line = mfree(line);
 349
 350         assert_se(get_process_cmdline(getpid_cached(), 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 351         assert_se(streq(line, "foo bar quux"));
 352         line = mfree(line);
 353
 354         assert_se(get_process_cmdline(getpid_cached(), 13, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 355         assert_se(streq(line, "foo bar quux"));
 356         line = mfree(line);
 357
 358         assert_se(get_process_cmdline(getpid_cached(), 14, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 359         assert_se(streq(line, "foo bar quux"));
 360         line = mfree(line);
 361
 362         assert_se(get_process_cmdline(getpid_cached(), 1000, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 363         assert_se(streq(line, "foo bar quux"));
 364         line = mfree(line);
 365
 366         assert_se(ftruncate(fd, 0) >= 0);
 367         assert_se(prctl(PR_SET_NAME, "aaaa bbbb cccc") >= 0);
 368
 369         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) == -ENOENT);
 370
 371         assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 372         assert_se(streq(line, "[aaaa bbbb cccc]"));
 373         line = mfree(line);
 374
 375         assert_se(get_process_cmdline(getpid_cached(), 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 376         assert_se(streq(line, "[aaaa bbb…"));
 377         line = mfree(line);
 378
 379         assert_se(get_process_cmdline(getpid_cached(), 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 380         assert_se(streq(line, "[aaaa bbbb…"));
 381         line = mfree(line);
 382
 383         assert_se(get_process_cmdline(getpid_cached(), 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 384         assert_se(streq(line, "[aaaa bbbb …"));
 385         line = mfree(line);
 386
 387         safe_close(fd);
 388         _exit(EXIT_SUCCESS);
 389 }
 390
 391 static void test_rename_process_now(const char *p, int ret) {
 392         _cleanup_free_ char *comm = NULL, *cmdline = NULL;
 393         int r;
 394
 395         r = rename_process(p);
 396         assert_se(r == ret ||
 397                   (ret == 0 && r >= 0) ||
 398                   (ret > 0 && r > 0));
 399
 400         if (r < 0)
 401                 return;
 402
 403 #if HAVE_VALGRIND_VALGRIND_H
 404         /* see above, valgrind is weird, we can't verify what we are doing here */
 405         if (RUNNING_ON_VALGRIND)
 406                 return;
 407 #endif
 408
 409         assert_se(get_process_comm(0, &comm) >= 0);
 410         log_info("comm = <%s>", comm);
 411         assert_se(strneq(comm, p, TASK_COMM_LEN-1));
 412         /* We expect comm to be at most 16 bytes (TASK_COMM_LEN). The kernel may raise this limit in the
 413          * future. We'd only check the initial part, at least until we recompile, but this will still pass. */
 414
 415         r = get_process_cmdline(0, SIZE_MAX, 0, &cmdline);
 416         assert_se(r >= 0);
 417         /* we cannot expect cmdline to be renamed properly without privileges */
 418         if (geteuid() == 0) {
 419                 if (r == 0 && detect_container() > 0)
 420                         log_info("cmdline = <%s> (not verified, Running in unprivileged container?)", cmdline);
 421                 else {
 422                         log_info("cmdline = <%s>", cmdline);
 423                         assert_se(strneq(p, cmdline, STRLEN("test-process-util")));
 424                         assert_se(startswith(p, cmdline));
 425                 }
 426         } else
 427                 log_info("cmdline = <%s> (not verified)", cmdline);
 428 }
 429
 430 static void test_rename_process_one(const char *p, int ret) {
 431         siginfo_t si;
 432         pid_t pid;
 433
 434         pid = fork();
 435         assert_se(pid >= 0);
 436
 437         if (pid == 0) {
 438                 /* child */
 439                 test_rename_process_now(p, ret);
 440                 _exit(EXIT_SUCCESS);
 441         }
 442
 443         assert_se(wait_for_terminate(pid, &si) >= 0);
 444         assert_se(si.si_code == CLD_EXITED);
 445         assert_se(si.si_status == EXIT_SUCCESS);
 446 }
 447
 448 static void test_rename_process_multi(void) {
 449         pid_t pid;
 450
 451         pid = fork();
 452         assert_se(pid >= 0);
 453
 454         if (pid > 0) {
 455                 siginfo_t si;
 456
 457                 assert_se(wait_for_terminate(pid, &si) >= 0);
 458                 assert_se(si.si_code == CLD_EXITED);
 459                 assert_se(si.si_status == EXIT_SUCCESS);
 460
 461                 return;
 462         }
 463
 464         /* child */
 465         test_rename_process_now("one", 1);
 466         test_rename_process_now("more", 0); /* longer than "one", hence truncated */
 467         (void) setresuid(99, 99, 99); /* change uid when running privileged */
 468         test_rename_process_now("time!", 0);
 469         test_rename_process_now("0", 1); /* shorter than "one", should fit */
 470         test_rename_process_one("", -EINVAL);
 471         test_rename_process_one(NULL, -EINVAL);
 472         _exit(EXIT_SUCCESS);
 473 }
 474
 475 static void test_rename_process(void) {
 476         test_rename_process_one(NULL, -EINVAL);
 477         test_rename_process_one("", -EINVAL);
 478         test_rename_process_one("foo", 1); /* should always fit */
 479         test_rename_process_one("this is a really really long process name, followed by some more words", 0); /* unlikely to fit */
 480         test_rename_process_one("1234567", 1); /* should always fit */
 481         test_rename_process_multi(); /* multiple invocations and dropped privileges */
 482 }
 483
 484 static void test_getpid_cached(void) {
 485         siginfo_t si;
 486         pid_t a, b, c, d, e, f, child;
 487
 488         a = raw_getpid();
 489         b = getpid_cached();
 490         c = getpid();
 491
 492         assert_se(a == b && a == c);
 493
 494         child = fork();
 495         assert_se(child >= 0);
 496
 497         if (child == 0) {
 498                 /* In child */
 499                 a = raw_getpid();
 500                 b = getpid_cached();
 501                 c = getpid();
 502
 503                 assert_se(a == b && a == c);
 504                 _exit(EXIT_SUCCESS);
 505         }
 506
 507         d = raw_getpid();
 508         e = getpid_cached();
 509         f = getpid();
 510
 511         assert_se(a == d && a == e && a == f);
 512
 513         assert_se(wait_for_terminate(child, &si) >= 0);
 514         assert_se(si.si_status == 0);
 515         assert_se(si.si_code == CLD_EXITED);
 516 }
 517
 518 #define MEASURE_ITERATIONS (10000000LLU)
 519
 520 static void test_getpid_measure(void) {
 521         unsigned long long i;
 522         usec_t t, q;
 523
 524         t = now(CLOCK_MONOTONIC);
 525         for (i = 0; i < MEASURE_ITERATIONS; i++)
 526                 (void) getpid();
 527         q = now(CLOCK_MONOTONIC) - t;
 528
 529         log_info(" glibc getpid(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
 530
 531         t = now(CLOCK_MONOTONIC);
 532         for (i = 0; i < MEASURE_ITERATIONS; i++)
 533                 (void) getpid_cached();
 534         q = now(CLOCK_MONOTONIC) - t;
 535
 536         log_info("getpid_cached(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
 537 }
 538
 539 static void test_safe_fork(void) {
 540         siginfo_t status;
 541         pid_t pid;
 542         int r;
 543
 544         BLOCK_SIGNALS(SIGCHLD);
 545
 546         r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_REOPEN_LOG, &pid);
 547         assert_se(r >= 0);
 548
 549         if (r == 0) {
 550                 /* child */
 551                 usleep(100 * USEC_PER_MSEC);
 552
 553                 _exit(88);
 554         }
 555
 556         assert_se(wait_for_terminate(pid, &status) >= 0);
 557         assert_se(status.si_code == CLD_EXITED);
 558         assert_se(status.si_status == 88);
 559 }
 560
 561 static void test_pid_to_ptr(void) {
 562
 563         assert_se(PTR_TO_PID(NULL) == 0);
 564         assert_se(PID_TO_PTR(0) == NULL);
 565
 566         assert_se(PTR_TO_PID(PID_TO_PTR(1)) == 1);
 567         assert_se(PTR_TO_PID(PID_TO_PTR(2)) == 2);
 568         assert_se(PTR_TO_PID(PID_TO_PTR(-1)) == -1);
 569         assert_se(PTR_TO_PID(PID_TO_PTR(-2)) == -2);
 570
 571         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
 572         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
 573
 574 #if SIZEOF_PID_T >= 4
 575         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
 576         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
 577 #endif
 578 }
 579
 580 static void test_ioprio_class_from_to_string_one(const char *val, int expected) {
 581         assert_se(ioprio_class_from_string(val) == expected);
 582         if (expected >= 0) {
 583                 _cleanup_free_ char *s = NULL;
 584                 unsigned ret;
 585
 586                 assert_se(ioprio_class_to_string_alloc(expected, &s) == 0);
 587                 /* We sometimes get a class number and sometimes a number back */
 588                 assert_se(streq(s, val) ||
 589                           safe_atou(val, &ret) == 0);
 590         }
 591 }
 592
 593 static void test_ioprio_class_from_to_string(void) {
 594         test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE);
 595         test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT);
 596         test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE);
 597         test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE);
 598         test_ioprio_class_from_to_string_one("0", 0);
 599         test_ioprio_class_from_to_string_one("1", 1);
 600         test_ioprio_class_from_to_string_one("7", 7);
 601         test_ioprio_class_from_to_string_one("8", 8);
 602         test_ioprio_class_from_to_string_one("9", -1);
 603         test_ioprio_class_from_to_string_one("-1", -1);
 604 }
 605
 606 int main(int argc, char *argv[]) {
 607         test_setup_logging(LOG_DEBUG);
 608
 609         save_argc_argv(argc, argv);
 610
 611         if (argc > 1) {
 612                 pid_t pid = 0;
 613
 614                 (void) parse_pid(argv[1], &pid);
 615                 test_get_process_comm(pid);
 616         } else {
 617                 TEST_REQ_RUNNING_SYSTEMD(test_get_process_comm(1));
 618                 test_get_process_comm(getpid());
 619         }
 620
 621         test_get_process_comm_escape();
 622         test_pid_is_unwaited();
 623         test_pid_is_alive();
 624         test_personality();
 625         test_get_process_cmdline_harder();
 626         test_rename_process();
 627         test_getpid_cached();
 628         test_getpid_measure();
 629         test_safe_fork();
 630         test_pid_to_ptr();
 631         test_ioprio_class_from_to_string();
 632
 633         return 0;
 634 }