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(void) {
 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 (reset_terminal(tty_fd) < 0)
 192                 log_error("Failed to reset /dev/console: %m");
 193
 194         if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
 195             dup2(tty_fd, STDERR_FILENO) < 0 ||
 196             dup2(null_fd, STDIN_FILENO) < 0) {
 197                 log_error("Failed to dup2() device: %m");
 198                 r = -errno;
 199                 goto finish;
 200         }
 201
 202         r = 0;
 203
 204 finish:
 205         if (tty_fd >= 0)
 206                 close_nointr_nofail(tty_fd);
 207
 208         if (null_fd >= 0)
 209                 close_nointr_nofail(null_fd);
 210
 211         return r;
 212 }
 213
 214 static int set_default_unit(const char *u) {
 215         char *c;
 216
 217         assert(u);
 218
 219         if (!(c = strdup(u)))
 220                 return -ENOMEM;
 221
 222         free(default_unit);
 223         default_unit = c;
 224         return 0;
 225 }
 226
 227 static int parse_proc_cmdline_word(const char *word) {
 228
 229         static const char * const rlmap[] = {
 230                 "single", SPECIAL_RUNLEVEL1_TARGET,
 231                 "-s",     SPECIAL_RUNLEVEL1_TARGET,
 232                 "s",      SPECIAL_RUNLEVEL1_TARGET,
 233                 "S",      SPECIAL_RUNLEVEL1_TARGET,
 234                 "1",      SPECIAL_RUNLEVEL1_TARGET,
 235                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 236                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 237                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 238                 "5",      SPECIAL_RUNLEVEL5_TARGET
 239         };
 240
 241         if (startswith(word, "systemd.default="))
 242                 return set_default_unit(word + 16);
 243
 244         else if (startswith(word, "systemd.log_target=")) {
 245
 246                 if (log_set_target_from_string(word + 19) < 0)
 247                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 248
 249         } else if (startswith(word, "systemd.log_level=")) {
 250
 251                 if (log_set_max_level_from_string(word + 18) < 0)
 252                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 253
 254         } else if (startswith(word, "systemd.dump_core=")) {
 255                 int r;
 256
 257                 if ((r = parse_boolean(word + 18)) < 0)
 258                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 259                 else
 260                         dump_core = r;
 261
 262         } else if (startswith(word, "systemd.crash_shell=")) {
 263                 int r;
 264
 265                 if ((r = parse_boolean(word + 20)) < 0)
 266                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 267                 else
 268                         crash_shell = r;
 269
 270
 271         } else if (startswith(word, "systemd.confirm_spawn=")) {
 272                 int r;
 273
 274                 if ((r = parse_boolean(word + 22)) < 0)
 275                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 276                 else
 277                         confirm_spawn = r;
 278
 279         } else if (startswith(word, "systemd.crash_chvt=")) {
 280                 int k;
 281
 282                 if (safe_atoi(word + 19, &k) < 0)
 283                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 284                 else
 285                         crash_chvt = k;
 286
 287         } else if (startswith(word, "systemd.")) {
 288
 289                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 290
 291                 log_info("Supported kernel switches:");
 292                 log_info("systemd.default=UNIT                     Default unit to start");
 293                 log_info("systemd.log_target=console|kmsg|syslog   Log target");
 294                 log_info("systemd.log_level=LEVEL                  Log level");
 295                 log_info("systemd.dump_core=0|1                    Dump core on crash");
 296                 log_info("systemd.crash_shell=0|1                  On crash run shell");
 297                 log_info("systemd.crash_chvt=N                     Change to VT #N on crash");
 298                 log_info("systemd.confirm_spawn=0|1                Confirm every process spawn");
 299
 300         } else {
 301                 unsigned i;
 302
 303                 /* SysV compatibility */
 304                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 305                         if (streq(word, rlmap[i]))
 306                                 return set_default_unit(rlmap[i+1]);
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int parse_proc_cmdline(void) {
 313         char *line;
 314         int r;
 315         char *w;
 316         size_t l;
 317         char *state;
 318
 319         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 320                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 321                 return 0;
 322         }
 323
 324         FOREACH_WORD_QUOTED(w, l, line, state) {
 325                 char *word;
 326
 327                 if (!(word = strndup(w, l))) {
 328                         r = -ENOMEM;
 329                         goto finish;
 330                 }
 331
 332                 r = parse_proc_cmdline_word(word);
 333                 free(word);
 334
 335                 if (r < 0)
 336                         goto finish;
 337         }
 338
 339         r = 0;
 340
 341 finish:
 342         free(line);
 343         return r;
 344 }
 345
 346 static int parse_argv(int argc, char *argv[]) {
 347
 348         enum {
 349                 ARG_LOG_LEVEL = 0x100,
 350                 ARG_LOG_TARGET,
 351                 ARG_DEFAULT,
 352                 ARG_RUNNING_AS,
 353                 ARG_TEST,
 354                 ARG_DUMP_CONFIGURATION_ITEMS,
 355                 ARG_CONFIRM_SPAWN,
 356                 ARG_DESERIALIZE
 357         };
 358
 359         static const struct option options[] = {
 360                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 361                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 362                 { "default",                  required_argument, NULL, ARG_DEFAULT                  },
 363                 { "running-as",               required_argument, NULL, ARG_RUNNING_AS               },
 364                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 365                 { "help",                     no_argument,       NULL, 'h'                          },
 366                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 367                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 368                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 369                 { NULL,                       0,                 NULL, 0                            }
 370         };
 371
 372         int c, r;
 373
 374         assert(argc >= 1);
 375         assert(argv);
 376
 377         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 378
 379                 switch (c) {
 380
 381                 case ARG_LOG_LEVEL:
 382                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 383                                 log_error("Failed to parse log level %s.", optarg);
 384                                 return r;
 385                         }
 386
 387                         break;
 388
 389                 case ARG_LOG_TARGET:
 390
 391                         if ((r = log_set_target_from_string(optarg)) < 0) {
 392                                 log_error("Failed to parse log target %s.", optarg);
 393                                 return r;
 394                         }
 395
 396                         break;
 397
 398                 case ARG_DEFAULT:
 399
 400                         if ((r = set_default_unit(optarg)) < 0) {
 401                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 402                                 return r;
 403                         }
 404
 405                         break;
 406
 407                 case ARG_RUNNING_AS: {
 408                         ManagerRunningAs as;
 409
 410                         if ((as = manager_running_as_from_string(optarg)) < 0) {
 411                                 log_error("Failed to parse running as value %s", optarg);
 412                                 return -EINVAL;
 413                         }
 414
 415                         running_as = as;
 416                         break;
 417                 }
 418
 419                 case ARG_TEST:
 420                         action = ACTION_TEST;
 421                         break;
 422
 423                 case ARG_DUMP_CONFIGURATION_ITEMS:
 424                         action = ACTION_DUMP_CONFIGURATION_ITEMS;
 425                         break;
 426
 427                 case ARG_CONFIRM_SPAWN:
 428                         confirm_spawn = true;
 429                         break;
 430
 431                 case ARG_DESERIALIZE: {
 432                         int fd;
 433                         FILE *f;
 434
 435                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 436                                 log_error("Failed to parse deserialize option %s.", optarg);
 437                                 return r;
 438                         }
 439
 440                         if (!(f = fdopen(fd, "r"))) {
 441                                 log_error("Failed to open serialization fd: %m");
 442                                 return r;
 443                         }
 444
 445                         if (serialization)
 446                                 fclose(serialization);
 447
 448                         serialization = f;
 449
 450                         break;
 451                 }
 452
 453                 case 'h':
 454                         action = ACTION_HELP;
 455                         break;
 456
 457                 case '?':
 458                         return -EINVAL;
 459
 460                 default:
 461                         log_error("Unknown option code %c", c);
 462                         return -EINVAL;
 463                 }
 464
 465         return 0;
 466 }
 467
 468 static int help(void) {
 469
 470         printf("%s [options]\n\n"
 471                "  -h --help                      Show this help\n"
 472                "     --default=UNIT              Set default unit\n"
 473                "     --log-level=LEVEL           Set log level\n"
 474                "     --log-target=TARGET         Set log target (console, syslog, kmsg)\n"
 475                "     --running-as=AS             Set running as (init, system, session)\n"
 476                "     --test                      Determine startup sequence, dump it and exit\n"
 477                "     --dump-configuration-items  Dump understood unit configuration items\n"
 478                "     --confirm-spawn             Ask for confirmation when spawning processes\n",
 479                __progname);
 480
 481         return 0;
 482 }
 483
 484 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 485         FILE *f = NULL;
 486         FDSet *fds = NULL;
 487         int r;
 488
 489         assert(m);
 490         assert(_f);
 491         assert(_fds);
 492
 493         if ((r = manager_open_serialization(&f)) < 0) {
 494                 log_error("Failed to create serialization faile: %s", strerror(-r));
 495                 goto fail;
 496         }
 497
 498         if (!(fds = fdset_new())) {
 499                 r = -ENOMEM;
 500                 log_error("Failed to allocate fd set: %s", strerror(-r));
 501                 goto fail;
 502         }
 503
 504         if ((r = manager_serialize(m, f, fds)) < 0) {
 505                 log_error("Failed to serialize state: %s", strerror(-r));
 506                 goto fail;
 507         }
 508
 509         if (fseeko(f, 0, SEEK_SET) < 0) {
 510                 log_error("Failed to rewind serialization fd: %m");
 511                 goto fail;
 512         }
 513
 514         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 515                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 516                 goto fail;
 517         }
 518
 519         if ((r = fdset_cloexec(fds, false)) < 0) {
 520                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 521                 goto fail;
 522         }
 523
 524         *_f = f;
 525         *_fds = fds;
 526
 527         return 0;
 528
 529 fail:
 530         fdset_free(fds);
 531
 532         if (f)
 533                 fclose(f);
 534
 535         return r;
 536 }
 537
 538 int main(int argc, char *argv[]) {
 539         Manager *m = NULL;
 540         Unit *target = NULL;
 541         Job *job = NULL;
 542         int r, retval = 1;
 543         FDSet *fds = NULL;
 544         bool reexecute = false;
 545
 546         if (getpid() == 1)
 547                 running_as = MANAGER_INIT;
 548         else if (getuid() == 0)
 549                 running_as = MANAGER_SYSTEM;
 550         else
 551                 running_as = MANAGER_SESSION;
 552
 553         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 554                 goto finish;
 555
 556         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 557          * /proc/$PID/fd is available. */
 558         if (mount_setup() < 0)
 559                 goto finish;
 560
 561         /* Reset all signal handlers. */
 562         assert_se(reset_all_signal_handlers() == 0);
 563
 564         /* If we are init, we can block sigkill. Yay. */
 565         ignore_signal(SIGKILL);
 566         ignore_signal(SIGPIPE);
 567
 568         if (running_as != MANAGER_SESSION)
 569                 if (parse_proc_cmdline() < 0)
 570                         goto finish;
 571
 572         log_parse_environment();
 573
 574         if (parse_argv(argc, argv) < 0)
 575                 goto finish;
 576
 577         if (action == ACTION_HELP) {
 578                 retval = help();
 579                 goto finish;
 580         } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 581                 unit_dump_config_items(stdout);
 582                 retval = 0;
 583                 goto finish;
 584         }
 585
 586         assert_se(action == ACTION_RUN || action == ACTION_TEST);
 587
 588         /* Remember open file descriptors for later deserialization */
 589         if (serialization) {
 590                 if ((r = fdset_new_fill(&fds)) < 0) {
 591                         log_error("Failed to allocate fd set: %s", strerror(-r));
 592                         goto finish;
 593                 }
 594
 595                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 596         } else
 597                 close_all_fds(NULL, 0);
 598
 599         /* Set up PATH unless it is already set */
 600         setenv("PATH",
 601                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 602                running_as == MANAGER_INIT);
 603
 604         /* Move out of the way, so that we won't block unmounts */
 605         assert_se(chdir("/")  == 0);
 606
 607         if (running_as != MANAGER_SESSION) {
 608                 /* Become a session leader if we aren't one yet. */
 609                 setsid();
 610
 611                 /* Disable the umask logic */
 612                 umask(0);
 613         }
 614
 615         if (running_as == MANAGER_INIT)
 616                 console_setup();
 617
 618         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 619         dbus_connection_set_change_sigpipe(FALSE);
 620
 621         /* Open the logging devices, if possible and necessary */
 622         log_open_syslog();
 623         log_open_kmsg();
 624
 625         /* Make sure we leave a core dump without panicing the
 626          * kernel. */
 627         if (getpid() == 1)
 628                 install_crash_handler();
 629
 630         log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
 631
 632         if (running_as == MANAGER_INIT)
 633                 hostname_setup();
 634
 635         if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
 636                 log_error("Failed to allocate manager object: %s", strerror(-r));
 637                 goto finish;
 638         }
 639
 640         if ((r = manager_startup(m, serialization, fds)) < 0)
 641                 log_error("Failed to fully startup daemon: %s", strerror(-r));
 642
 643         if (fds) {
 644                 /* This will close all file descriptors that were opened, but
 645                  * not claimed by any unit. */
 646
 647                 fdset_free(fds);
 648                 fds = NULL;
 649         }
 650
 651         if (serialization) {
 652                 fclose(serialization);
 653                 serialization = NULL;
 654         } else {
 655                 log_debug("Activating default unit: %s", default_unit);
 656
 657                 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
 658                         log_error("Failed to load default target: %s", strerror(-r));
 659
 660                         log_info("Trying to load rescue target...");
 661                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
 662                                 log_error("Failed to load rescue target: %s", strerror(-r));
 663                                 goto finish;
 664                         }
 665                 }
 666
 667                 if (action == ACTION_TEST) {
 668                         printf("→ By units:\n");
 669                         manager_dump_units(m, stdout, "\t");
 670                 }
 671
 672                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
 673                         log_error("Failed to start default target: %s", strerror(-r));
 674                         goto finish;
 675                 }
 676
 677                 if (action == ACTION_TEST) {
 678                         printf("→ By jobs:\n");
 679                         manager_dump_jobs(m, stdout, "\t");
 680                         retval = 0;
 681                         goto finish;
 682                 }
 683         }
 684
 685         for (;;) {
 686                 if ((r = manager_loop(m)) < 0) {
 687                         log_error("Failed to run mainloop: %s", strerror(-r));
 688                         goto finish;
 689                 }
 690
 691                 switch (m->exit_code) {
 692
 693                 case MANAGER_EXIT:
 694                         retval = 0;
 695                         log_debug("Exit.");
 696                         goto finish;
 697
 698                 case MANAGER_RELOAD:
 699                         if ((r = manager_reload(m)) < 0)
 700                                 log_error("Failed to reload: %s", strerror(-r));
 701                         break;
 702
 703                 case MANAGER_REEXECUTE:
 704                         if (prepare_reexecute(m, &serialization, &fds) < 0)
 705                                 goto finish;
 706
 707                         reexecute = true;
 708                         log_debug("Reexecuting.");
 709                         goto finish;
 710
 711                 default:
 712                         assert_not_reached("Unknown exit code.");
 713                 }
 714         }
 715
 716 finish:
 717         if (m)
 718                 manager_free(m);
 719
 720         free(default_unit);
 721
 722         dbus_shutdown();
 723
 724         if (reexecute) {
 725                 const char *args[11];
 726                 unsigned i = 0;
 727                 char sfd[16];
 728
 729                 assert(serialization);
 730                 assert(fds);
 731
 732                 args[i++] = SYSTEMD_BINARY_PATH;
 733
 734                 args[i++] = "--log-level";
 735                 args[i++] = log_level_to_string(log_get_max_level());
 736
 737                 args[i++] = "--log-target";
 738                 args[i++] = log_target_to_string(log_get_target());
 739
 740                 args[i++] = "--running-as";
 741                 args[i++] = manager_running_as_to_string(running_as);
 742
 743                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
 744                 char_array_0(sfd);
 745
 746                 args[i++] = "--deserialize";
 747                 args[i++] = sfd;
 748
 749                 if (confirm_spawn)
 750                         args[i++] = "--confirm-spawn";
 751
 752                 args[i++] = NULL;
 753
 754                 assert(i <= ELEMENTSOF(args));
 755
 756                 execv(args[0], (char* const*) args);
 757
 758                 log_error("Failed to reexecute: %m");
 759         }
 760
 761         if (serialization)
 762                 fclose(serialization);
 763
 764         if (fds)
 765                 fdset_free(fds);
 766
 767         if (getpid() == 1)
 768                 freeze();
 769
 770         return retval;
 771 }