main.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <getopt.h>
  31 #include <signal.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34
  35 #include "manager.h"
  36 #include "log.h"
  37 #include "mount-setup.h"
  38 #include "hostname-setup.h"
  39 #include "load-fragment.h"
  40 #include "fdset.h"
  41
  42 static enum {
  43         ACTION_RUN,
  44         ACTION_HELP,
  45         ACTION_TEST,
  46         ACTION_DUMP_CONFIGURATION_ITEMS
  47 } action = ACTION_RUN;
  48
  49 static char *default_unit = NULL;
  50 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
  51
  52 static bool dump_core = true;
  53 static bool crash_shell = false;
  54 static int crash_chvt = -1;
  55 static bool confirm_spawn = false;
  56 static FILE* serialization = NULL;
  57
  58 _noreturn static void freeze(void) {
  59         for (;;)
  60                 pause();
  61 }
  62
  63 static void nop_handler(int sig) {
  64 }
  65
  66 _noreturn static void crash(int sig) {
  67
  68         if (!dump_core)
  69                 log_error("Caught <%s>, not dumping core.", strsignal(sig));
  70         else {
  71                 struct sigaction sa;
  72                 pid_t pid;
  73
  74                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  75                 zero(sa);
  76                 sa.sa_handler = nop_handler;
  77                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  78                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  79
  80                 if ((pid = fork()) < 0)
  81                         log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
  82
  83                 else if (pid == 0) {
  84                         struct rlimit rl;
  85
  86                         /* Enable default signal handler for core dump */
  87                         zero(sa);
  88                         sa.sa_handler = SIG_DFL;
  89                         assert_se(sigaction(sig, &sa, NULL) == 0);
  90
  91                         /* Don't limit the core dump size */
  92                         zero(rl);
  93                         rl.rlim_cur = RLIM_INFINITY;
  94                         rl.rlim_max = RLIM_INFINITY;
  95                         setrlimit(RLIMIT_CORE, &rl);
  96
  97                         /* Just to be sure... */
  98                         assert_se(chdir("/") == 0);
  99
 100                         /* Raise the signal again */
 101                         raise(sig);
 102
 103                         assert_not_reached("We shouldn't be here...");
 104                         _exit(1);
 105
 106                 } else {
 107                         int status, r;
 108
 109                         /* Order things nicely. */
 110                         if ((r = waitpid(pid, &status, 0)) < 0)
 111                                 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
 112                         else if (!WCOREDUMP(status))
 113                                 log_error("Caught <%s>, core dump failed.", strsignal(sig));
 114                         else
 115                                 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
 116                 }
 117         }
 118
 119         if (crash_chvt)
 120                 chvt(crash_chvt);
 121
 122         if (crash_shell) {
 123                 struct sigaction sa;
 124                 pid_t pid;
 125
 126                 log_info("Executing crash shell in 10s...");
 127                 sleep(10);
 128
 129                 /* Let the kernel reap children for us */
 130                 zero(sa);
 131                 sa.sa_handler = SIG_IGN;
 132                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 133                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 134
 135                 if ((pid = fork()) < 0)
 136                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 137                 else if (pid == 0) {
 138                         execl("/bin/sh", "/bin/sh", NULL);
 139
 140                         log_error("execl() failed: %s", strerror(errno));
 141                         _exit(1);
 142                 }
 143
 144                 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
 145         }
 146
 147         log_info("Freezing execution.");
 148         freeze();
 149 }
 150
 151 static void install_crash_handler(void) {
 152         struct sigaction sa;
 153
 154         zero(sa);
 155
 156         sa.sa_handler = crash;
 157         sa.sa_flags = SA_NODEFER;
 158
 159         assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
 160         assert_se(sigaction(SIGILL, &sa, NULL) == 0);
 161         assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
 162         assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
 163         assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
 164         assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
 165 }
 166
 167 static int console_setup(bool do_reset) {
 168         int tty_fd = -1, null_fd = -1, r = 0;
 169
 170         /* If we are init, we connect stdout/stderr to /dev/console
 171          * and stdin to /dev/null and make sure we don't have a
 172          * controlling tty. */
 173
 174         release_terminal();
 175
 176         if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
 177                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 178                 r = -tty_fd;
 179                 goto finish;
 180         }
 181
 182         if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
 183                 log_error("Failed to open /dev/null: %m");
 184                 r = -errno;
 185                 goto finish;
 186         }
 187
 188         assert(tty_fd >= 3);
 189         assert(null_fd >= 3);
 190
 191         if (do_reset)
 192                 if (reset_terminal(tty_fd) < 0)
 193                         log_error("Failed to reset /dev/console: %m");
 194
 195         if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
 196             dup2(tty_fd, STDERR_FILENO) < 0 ||
 197             dup2(null_fd, STDIN_FILENO) < 0) {
 198                 log_error("Failed to dup2() device: %m");
 199                 r = -errno;
 200                 goto finish;
 201         }
 202
 203         r = 0;
 204
 205 finish:
 206         if (tty_fd >= 0)
 207                 close_nointr_nofail(tty_fd);
 208
 209         if (null_fd >= 0)
 210                 close_nointr_nofail(null_fd);
 211
 212         return r;
 213 }
 214
 215 static int set_default_unit(const char *u) {
 216         char *c;
 217
 218         assert(u);
 219
 220         if (!(c = strdup(u)))
 221                 return -ENOMEM;
 222
 223         free(default_unit);
 224         default_unit = c;
 225         return 0;
 226 }
 227
 228 static int parse_proc_cmdline_word(const char *word) {
 229
 230         static const char * const rlmap[] = {
 231                 "single", SPECIAL_RUNLEVEL1_TARGET,
 232                 "-s",     SPECIAL_RUNLEVEL1_TARGET,
 233                 "s",      SPECIAL_RUNLEVEL1_TARGET,
 234                 "S",      SPECIAL_RUNLEVEL1_TARGET,
 235                 "1",      SPECIAL_RUNLEVEL1_TARGET,
 236                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 237                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 238                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 239                 "5",      SPECIAL_RUNLEVEL5_TARGET
 240         };
 241
 242         if (startswith(word, "systemd.default="))
 243                 return set_default_unit(word + 16);
 244
 245         else if (startswith(word, "systemd.log_target=")) {
 246
 247                 if (log_set_target_from_string(word + 19) < 0)
 248                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 249
 250         } else if (startswith(word, "systemd.log_level=")) {
 251
 252                 if (log_set_max_level_from_string(word + 18) < 0)
 253                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 254
 255         } else if (startswith(word, "systemd.dump_core=")) {
 256                 int r;
 257
 258                 if ((r = parse_boolean(word + 18)) < 0)
 259                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 260                 else
 261                         dump_core = r;
 262
 263         } else if (startswith(word, "systemd.crash_shell=")) {
 264                 int r;
 265
 266                 if ((r = parse_boolean(word + 20)) < 0)
 267                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 268                 else
 269                         crash_shell = r;
 270
 271
 272         } else if (startswith(word, "systemd.confirm_spawn=")) {
 273                 int r;
 274
 275                 if ((r = parse_boolean(word + 22)) < 0)
 276                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 277                 else
 278                         confirm_spawn = r;
 279
 280         } else if (startswith(word, "systemd.crash_chvt=")) {
 281                 int k;
 282
 283                 if (safe_atoi(word + 19, &k) < 0)
 284                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 285                 else
 286                         crash_chvt = k;
 287
 288         } else if (startswith(word, "systemd.")) {
 289
 290                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 291
 292                 log_info("Supported kernel switches:");
 293                 log_info("systemd.default=UNIT                     Default unit to start");
 294                 log_info("systemd.log_target=console|kmsg|syslog   Log target");
 295                 log_info("systemd.log_level=LEVEL                  Log level");
 296                 log_info("systemd.dump_core=0|1                    Dump core on crash");
 297                 log_info("systemd.crash_shell=0|1                  On crash run shell");
 298                 log_info("systemd.crash_chvt=N                     Change to VT #N on crash");
 299                 log_info("systemd.confirm_spawn=0|1                Confirm every process spawn");
 300
 301         } else {
 302                 unsigned i;
 303
 304                 /* SysV compatibility */
 305                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 306                         if (streq(word, rlmap[i]))
 307                                 return set_default_unit(rlmap[i+1]);
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int parse_proc_cmdline(void) {
 314         char *line;
 315         int r;
 316         char *w;
 317         size_t l;
 318         char *state;
 319
 320         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 321                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 322                 return 0;
 323         }
 324
 325         FOREACH_WORD_QUOTED(w, l, line, state) {
 326                 char *word;
 327
 328                 if (!(word = strndup(w, l))) {
 329                         r = -ENOMEM;
 330                         goto finish;
 331                 }
 332
 333                 r = parse_proc_cmdline_word(word);
 334                 free(word);
 335
 336                 if (r < 0)
 337                         goto finish;
 338         }
 339
 340         r = 0;
 341
 342 finish:
 343         free(line);
 344         return r;
 345 }
 346
 347 static int parse_argv(int argc, char *argv[]) {
 348
 349         enum {
 350                 ARG_LOG_LEVEL = 0x100,
 351                 ARG_LOG_TARGET,
 352                 ARG_DEFAULT,
 353                 ARG_RUNNING_AS,
 354                 ARG_TEST,
 355                 ARG_DUMP_CONFIGURATION_ITEMS,
 356                 ARG_CONFIRM_SPAWN,
 357                 ARG_DESERIALIZE
 358         };
 359
 360         static const struct option options[] = {
 361                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 362                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 363                 { "default",                  required_argument, NULL, ARG_DEFAULT                  },
 364                 { "running-as",               required_argument, NULL, ARG_RUNNING_AS               },
 365                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 366                 { "help",                     no_argument,       NULL, 'h'                          },
 367                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 368                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 369                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 370                 { NULL,                       0,                 NULL, 0                            }
 371         };
 372
 373         int c, r;
 374
 375         assert(argc >= 1);
 376         assert(argv);
 377
 378         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 379
 380                 switch (c) {
 381
 382                 case ARG_LOG_LEVEL:
 383                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 384                                 log_error("Failed to parse log level %s.", optarg);
 385                                 return r;
 386                         }
 387
 388                         break;
 389
 390                 case ARG_LOG_TARGET:
 391
 392                         if ((r = log_set_target_from_string(optarg)) < 0) {
 393                                 log_error("Failed to parse log target %s.", optarg);
 394                                 return r;
 395                         }
 396
 397                         break;
 398
 399                 case ARG_DEFAULT:
 400
 401                         if ((r = set_default_unit(optarg)) < 0) {
 402                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 403                                 return r;
 404                         }
 405
 406                         break;
 407
 408                 case ARG_RUNNING_AS: {
 409                         ManagerRunningAs as;
 410
 411                         if ((as = manager_running_as_from_string(optarg)) < 0) {
 412                                 log_error("Failed to parse running as value %s", optarg);
 413                                 return -EINVAL;
 414                         }
 415
 416                         running_as = as;
 417                         break;
 418                 }
 419
 420                 case ARG_TEST:
 421                         action = ACTION_TEST;
 422                         break;
 423
 424                 case ARG_DUMP_CONFIGURATION_ITEMS:
 425                         action = ACTION_DUMP_CONFIGURATION_ITEMS;
 426                         break;
 427
 428                 case ARG_CONFIRM_SPAWN:
 429                         confirm_spawn = true;
 430                         break;
 431
 432                 case ARG_DESERIALIZE: {
 433                         int fd;
 434                         FILE *f;
 435
 436                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 437                                 log_error("Failed to parse deserialize option %s.", optarg);
 438                                 return r;
 439                         }
 440
 441                         if (!(f = fdopen(fd, "r"))) {
 442                                 log_error("Failed to open serialization fd: %m");
 443                                 return r;
 444                         }
 445
 446                         if (serialization)
 447                                 fclose(serialization);
 448
 449                         serialization = f;
 450
 451                         break;
 452                 }
 453
 454                 case 'h':
 455                         action = ACTION_HELP;
 456                         break;
 457
 458                 case '?':
 459                         return -EINVAL;
 460
 461                 default:
 462                         log_error("Unknown option code %c", c);
 463                         return -EINVAL;
 464                 }
 465
 466         return 0;
 467 }
 468
 469 static int help(void) {
 470
 471         printf("%s [options]\n\n"
 472                "  -h --help                      Show this help\n"
 473                "     --default=UNIT              Set default unit\n"
 474                "     --log-level=LEVEL           Set log level\n"
 475                "     --log-target=TARGET         Set log target (console, syslog, kmsg)\n"
 476                "     --running-as=AS             Set running as (init, system, session)\n"
 477                "     --test                      Determine startup sequence, dump it and exit\n"
 478                "     --dump-configuration-items  Dump understood unit configuration items\n"
 479                "     --confirm-spawn             Ask for confirmation when spawning processes\n",
 480                __progname);
 481
 482         return 0;
 483 }
 484
 485 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 486         FILE *f = NULL;
 487         FDSet *fds = NULL;
 488         int r;
 489
 490         assert(m);
 491         assert(_f);
 492         assert(_fds);
 493
 494         if ((r = manager_open_serialization(&f)) < 0) {
 495                 log_error("Failed to create serialization faile: %s", strerror(-r));
 496                 goto fail;
 497         }
 498
 499         if (!(fds = fdset_new())) {
 500                 r = -ENOMEM;
 501                 log_error("Failed to allocate fd set: %s", strerror(-r));
 502                 goto fail;
 503         }
 504
 505         if ((r = manager_serialize(m, f, fds)) < 0) {
 506                 log_error("Failed to serialize state: %s", strerror(-r));
 507                 goto fail;
 508         }
 509
 510         if (fseeko(f, 0, SEEK_SET) < 0) {
 511                 log_error("Failed to rewind serialization fd: %m");
 512                 goto fail;
 513         }
 514
 515         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 516                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 517                 goto fail;
 518         }
 519
 520         if ((r = fdset_cloexec(fds, false)) < 0) {
 521                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 522                 goto fail;
 523         }
 524
 525         *_f = f;
 526         *_fds = fds;
 527
 528         return 0;
 529
 530 fail:
 531         fdset_free(fds);
 532
 533         if (f)
 534                 fclose(f);
 535
 536         return r;
 537 }
 538
 539 int main(int argc, char *argv[]) {
 540         Manager *m = NULL;
 541         Unit *target = NULL;
 542         Job *job = NULL;
 543         int r, retval = 1;
 544         FDSet *fds = NULL;
 545         bool reexecute = false;
 546
 547         if (getpid() == 1)
 548                 running_as = MANAGER_INIT;
 549         else if (getuid() == 0)
 550                 running_as = MANAGER_SYSTEM;
 551         else
 552                 running_as = MANAGER_SESSION;
 553
 554         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 555                 goto finish;
 556
 557         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 558          * /proc/$PID/fd is available. */
 559         if (mount_setup() < 0)
 560                 goto finish;
 561
 562         /* Reset all signal handlers. */
 563         assert_se(reset_all_signal_handlers() == 0);
 564
 565         /* If we are init, we can block sigkill. Yay. */
 566         ignore_signal(SIGKILL);
 567         ignore_signal(SIGPIPE);
 568
 569         if (running_as != MANAGER_SESSION)
 570                 if (parse_proc_cmdline() < 0)
 571                         goto finish;
 572
 573         log_parse_environment();
 574
 575         if (parse_argv(argc, argv) < 0)
 576                 goto finish;
 577
 578         if (action == ACTION_HELP) {
 579                 retval = help();
 580                 goto finish;
 581         } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 582                 unit_dump_config_items(stdout);
 583                 retval = 0;
 584                 goto finish;
 585         }
 586
 587         assert_se(action == ACTION_RUN || action == ACTION_TEST);
 588
 589         /* Remember open file descriptors for later deserialization */
 590         if (serialization) {
 591                 if ((r = fdset_new_fill(&fds)) < 0) {
 592                         log_error("Failed to allocate fd set: %s", strerror(-r));
 593                         goto finish;
 594                 }
 595
 596                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 597         } else
 598                 close_all_fds(NULL, 0);
 599
 600         /* Set up PATH unless it is already set */
 601         setenv("PATH",
 602                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 603                running_as == MANAGER_INIT);
 604
 605         /* Move out of the way, so that we won't block unmounts */
 606         assert_se(chdir("/")  == 0);
 607
 608         if (running_as != MANAGER_SESSION) {
 609                 /* Become a session leader if we aren't one yet. */
 610                 setsid();
 611
 612                 /* Disable the umask logic */
 613                 umask(0);
 614         }
 615
 616         /* Reset the console, but only if this is really init and we
 617          * are freshly booted */
 618         if (running_as == MANAGER_INIT)
 619                 console_setup(getpid() == 1 && !serialization);
 620
 621         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 622         dbus_connection_set_change_sigpipe(FALSE);
 623
 624         /* Open the logging devices, if possible and necessary */
 625         log_open_syslog();
 626         log_open_kmsg();
 627
 628         /* Make sure we leave a core dump without panicing the
 629          * kernel. */
 630         if (getpid() == 1)
 631                 install_crash_handler();
 632
 633         log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
 634
 635         if (running_as == MANAGER_INIT)
 636                 hostname_setup();
 637
 638         if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
 639                 log_error("Failed to allocate manager object: %s", strerror(-r));
 640                 goto finish;
 641         }
 642
 643         if ((r = manager_startup(m, serialization, fds)) < 0)
 644                 log_error("Failed to fully startup daemon: %s", strerror(-r));
 645
 646         if (fds) {
 647                 /* This will close all file descriptors that were opened, but
 648                  * not claimed by any unit. */
 649
 650                 fdset_free(fds);
 651                 fds = NULL;
 652         }
 653
 654         if (serialization) {
 655                 fclose(serialization);
 656                 serialization = NULL;
 657         } else {
 658                 log_debug("Activating default unit: %s", default_unit);
 659
 660                 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
 661                         log_error("Failed to load default target: %s", strerror(-r));
 662
 663                         log_info("Trying to load rescue target...");
 664                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
 665                                 log_error("Failed to load rescue target: %s", strerror(-r));
 666                                 goto finish;
 667                         }
 668                 }
 669
 670                 if (action == ACTION_TEST) {
 671                         printf("-> By units:\n");
 672                         manager_dump_units(m, stdout, "\t");
 673                 }
 674
 675                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
 676                         log_error("Failed to start default target: %s", strerror(-r));
 677                         goto finish;
 678                 }
 679
 680                 if (action == ACTION_TEST) {
 681                         printf("-> By jobs:\n");
 682                         manager_dump_jobs(m, stdout, "\t");
 683                         retval = 0;
 684                         goto finish;
 685                 }
 686         }
 687
 688         for (;;) {
 689                 if ((r = manager_loop(m)) < 0) {
 690                         log_error("Failed to run mainloop: %s", strerror(-r));
 691                         goto finish;
 692                 }
 693
 694                 switch (m->exit_code) {
 695
 696                 case MANAGER_EXIT:
 697                         retval = 0;
 698                         log_debug("Exit.");
 699                         goto finish;
 700
 701                 case MANAGER_RELOAD:
 702                         if ((r = manager_reload(m)) < 0)
 703                                 log_error("Failed to reload: %s", strerror(-r));
 704                         break;
 705
 706                 case MANAGER_REEXECUTE:
 707                         if (prepare_reexecute(m, &serialization, &fds) < 0)
 708                                 goto finish;
 709
 710                         reexecute = true;
 711                         log_debug("Reexecuting.");
 712                         goto finish;
 713
 714                 default:
 715                         assert_not_reached("Unknown exit code.");
 716                 }
 717         }
 718
 719 finish:
 720         if (m)
 721                 manager_free(m);
 722
 723         free(default_unit);
 724
 725         dbus_shutdown();
 726
 727         if (reexecute) {
 728                 const char *args[11];
 729                 unsigned i = 0;
 730                 char sfd[16];
 731
 732                 assert(serialization);
 733                 assert(fds);
 734
 735                 args[i++] = SYSTEMD_BINARY_PATH;
 736
 737                 args[i++] = "--log-level";
 738                 args[i++] = log_level_to_string(log_get_max_level());
 739
 740                 args[i++] = "--log-target";
 741                 args[i++] = log_target_to_string(log_get_target());
 742
 743                 args[i++] = "--running-as";
 744                 args[i++] = manager_running_as_to_string(running_as);
 745
 746                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
 747                 char_array_0(sfd);
 748
 749                 args[i++] = "--deserialize";
 750                 args[i++] = sfd;
 751
 752                 if (confirm_spawn)
 753                         args[i++] = "--confirm-spawn";
 754
 755                 args[i++] = NULL;
 756
 757                 assert(i <= ELEMENTSOF(args));
 758
 759                 execv(args[0], (char* const*) args);
 760
 761                 log_error("Failed to reexecute: %m");
 762         }
 763
 764         if (serialization)
 765                 fclose(serialization);
 766
 767         if (fds)
 768                 fdset_free(fds);
 769
 770         if (getpid() == 1)
 771                 freeze();
 772
 773         return retval;
 774 }