src/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 "loopback-setup.h"
  40 #include "kmod-setup.h"
  41 #include "modprobe-setup.h"
  42 #include "load-fragment.h"
  43 #include "fdset.h"
  44 #include "special.h"
  45
  46 static enum {
  47         ACTION_RUN,
  48         ACTION_HELP,
  49         ACTION_TEST,
  50         ACTION_DUMP_CONFIGURATION_ITEMS,
  51         ACTION_DONE
  52 } arg_action = ACTION_RUN;
  53
  54 static char *arg_default_unit = NULL;
  55 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  56
  57 static bool arg_dump_core = true;
  58 static bool arg_crash_shell = false;
  59 static int arg_crash_chvt = -1;
  60 static bool arg_confirm_spawn = false;
  61 static bool arg_nomodules = false;
  62
  63 static FILE* serialization = NULL;
  64
  65 _noreturn_ static void freeze(void) {
  66         for (;;)
  67                 pause();
  68 }
  69
  70 static void nop_handler(int sig) {
  71 }
  72
  73 _noreturn_ static void crash(int sig) {
  74
  75         if (!arg_dump_core)
  76                 log_error("Caught <%s>, not dumping core.", strsignal(sig));
  77         else {
  78                 struct sigaction sa;
  79                 pid_t pid;
  80
  81                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  82                 zero(sa);
  83                 sa.sa_handler = nop_handler;
  84                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  85                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  86
  87                 if ((pid = fork()) < 0)
  88                         log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
  89
  90                 else if (pid == 0) {
  91                         struct rlimit rl;
  92
  93                         /* Enable default signal handler for core dump */
  94                         zero(sa);
  95                         sa.sa_handler = SIG_DFL;
  96                         assert_se(sigaction(sig, &sa, NULL) == 0);
  97
  98                         /* Don't limit the core dump size */
  99                         zero(rl);
 100                         rl.rlim_cur = RLIM_INFINITY;
 101                         rl.rlim_max = RLIM_INFINITY;
 102                         setrlimit(RLIMIT_CORE, &rl);
 103
 104                         /* Just to be sure... */
 105                         assert_se(chdir("/") == 0);
 106
 107                         /* Raise the signal again */
 108                         raise(sig);
 109
 110                         assert_not_reached("We shouldn't be here...");
 111                         _exit(1);
 112
 113                 } else {
 114                         int status, r;
 115
 116                         /* Order things nicely. */
 117                         if ((r = waitpid(pid, &status, 0)) < 0)
 118                                 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
 119                         else if (!WCOREDUMP(status))
 120                                 log_error("Caught <%s>, core dump failed.", strsignal(sig));
 121                         else
 122                                 log_error("Caught <%s>, dumped core as pid %lu.", strsignal(sig), (unsigned long) pid);
 123                 }
 124         }
 125
 126         if (arg_crash_chvt)
 127                 chvt(arg_crash_chvt);
 128
 129         if (arg_crash_shell) {
 130                 struct sigaction sa;
 131                 pid_t pid;
 132
 133                 log_info("Executing crash shell in 10s...");
 134                 sleep(10);
 135
 136                 /* Let the kernel reap children for us */
 137                 zero(sa);
 138                 sa.sa_handler = SIG_IGN;
 139                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 140                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 141
 142                 if ((pid = fork()) < 0)
 143                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 144                 else if (pid == 0) {
 145                         int fd, r;
 146
 147                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 148                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 149                         else if ((r = make_stdio(fd)) < 0)
 150                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 151
 152                         execl("/bin/sh", "/bin/sh", NULL);
 153
 154                         log_error("execl() failed: %s", strerror(errno));
 155                         _exit(1);
 156                 }
 157
 158                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 159         }
 160
 161         log_info("Freezing execution.");
 162         freeze();
 163 }
 164
 165 static void install_crash_handler(void) {
 166         struct sigaction sa;
 167
 168         zero(sa);
 169
 170         sa.sa_handler = crash;
 171         sa.sa_flags = SA_NODEFER;
 172
 173         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 174 }
 175
 176 static int make_null_stdio(void) {
 177         int null_fd, r;
 178
 179         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 180                 log_error("Failed to open /dev/null: %m");
 181                 return -errno;
 182         }
 183
 184         if ((r = make_stdio(null_fd)) < 0)
 185                 log_warning("Failed to dup2() device: %s", strerror(-r));
 186
 187         return r;
 188 }
 189
 190 static int console_setup(bool do_reset) {
 191         int tty_fd, r;
 192
 193         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 194          * and make sure we don't have a controlling tty. */
 195
 196         release_terminal();
 197
 198         if (!do_reset)
 199                 return 0;
 200
 201         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 202                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 203                 return -tty_fd;
 204         }
 205
 206         if ((r = reset_terminal(tty_fd)) < 0)
 207                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 208
 209         close_nointr_nofail(tty_fd);
 210         return r;
 211 }
 212
 213 static int set_default_unit(const char *u) {
 214         char *c;
 215
 216         assert(u);
 217
 218         if (!(c = strdup(u)))
 219                 return -ENOMEM;
 220
 221         free(arg_default_unit);
 222         arg_default_unit = c;
 223         return 0;
 224 }
 225
 226 static int parse_proc_cmdline_word(const char *word) {
 227
 228         static const char * const rlmap[] = {
 229                 "single", SPECIAL_RESCUE_TARGET,
 230                 "-s",     SPECIAL_RESCUE_TARGET,
 231                 "s",      SPECIAL_RESCUE_TARGET,
 232                 "S",      SPECIAL_RESCUE_TARGET,
 233                 "1",      SPECIAL_RESCUE_TARGET,
 234                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 235                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 236                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 237                 "5",      SPECIAL_RUNLEVEL5_TARGET
 238         };
 239
 240         if (startswith(word, "systemd.unit="))
 241                 return set_default_unit(word + 13);
 242
 243         else if (startswith(word, "systemd.log_target=")) {
 244
 245                 if (log_set_target_from_string(word + 19) < 0)
 246                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 247
 248         } else if (startswith(word, "systemd.log_level=")) {
 249
 250                 if (log_set_max_level_from_string(word + 18) < 0)
 251                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 252
 253         } else if (startswith(word, "systemd.log_color=")) {
 254
 255                 if (log_show_color_from_string(word + 18) < 0)
 256                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 257
 258         } else if (startswith(word, "systemd.log_location=")) {
 259
 260                 if (log_show_location_from_string(word + 21) < 0)
 261                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 262
 263         } else if (startswith(word, "systemd.dump_core=")) {
 264                 int r;
 265
 266                 if ((r = parse_boolean(word + 18)) < 0)
 267                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 268                 else
 269                         arg_dump_core = r;
 270
 271         } else if (startswith(word, "systemd.crash_shell=")) {
 272                 int r;
 273
 274                 if ((r = parse_boolean(word + 20)) < 0)
 275                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 276                 else
 277                         arg_crash_shell = r;
 278
 279         } else if (startswith(word, "systemd.confirm_spawn=")) {
 280                 int r;
 281
 282                 if ((r = parse_boolean(word + 22)) < 0)
 283                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 284                 else
 285                         arg_confirm_spawn = r;
 286
 287         } else if (startswith(word, "systemd.crash_chvt=")) {
 288                 int k;
 289
 290                 if (safe_atoi(word + 19, &k) < 0)
 291                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 292                 else
 293                         arg_crash_chvt = k;
 294
 295         } else if (startswith(word, "systemd.")) {
 296
 297                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 298
 299                 log_info("Supported kernel switches:\n"
 300                          "systemd.unit=UNIT                        Default unit to start\n"
 301                          "systemd.log_target=console|kmsg|syslog|  Log target\n"
 302                          "                   syslog-org-kmsg|null\n"
 303                          "systemd.log_level=LEVEL                  Log level\n"
 304                          "systemd.log_color=0|1                    Highlight important log messages\n"
 305                          "systemd.log_location=0|1                 Include code location in log messages\n"
 306                          "systemd.dump_core=0|1                    Dump core on crash\n"
 307                          "systemd.crash_shell=0|1                  On crash run shell\n"
 308                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 309                          "systemd.confirm_spawn=0|1                Confirm every process spawn");
 310
 311         } else if (streq(word, "nomodules"))
 312                 arg_nomodules = true;
 313         else {
 314                 unsigned i;
 315
 316                 /* SysV compatibility */
 317                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 318                         if (streq(word, rlmap[i]))
 319                                 return set_default_unit(rlmap[i+1]);
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int parse_proc_cmdline(void) {
 326         char *line;
 327         int r;
 328         char *w;
 329         size_t l;
 330         char *state;
 331
 332         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 333                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 334                 return 0;
 335         }
 336
 337         FOREACH_WORD_QUOTED(w, l, line, state) {
 338                 char *word;
 339
 340                 if (!(word = strndup(w, l))) {
 341                         r = -ENOMEM;
 342                         goto finish;
 343                 }
 344
 345                 r = parse_proc_cmdline_word(word);
 346                 free(word);
 347
 348                 if (r < 0)
 349                         goto finish;
 350         }
 351
 352         r = 0;
 353
 354 finish:
 355         free(line);
 356         return r;
 357 }
 358
 359 static int parse_argv(int argc, char *argv[]) {
 360
 361         enum {
 362                 ARG_LOG_LEVEL = 0x100,
 363                 ARG_LOG_TARGET,
 364                 ARG_LOG_COLOR,
 365                 ARG_LOG_LOCATION,
 366                 ARG_UNIT,
 367                 ARG_RUNNING_AS,
 368                 ARG_TEST,
 369                 ARG_DUMP_CONFIGURATION_ITEMS,
 370                 ARG_CONFIRM_SPAWN,
 371                 ARG_DESERIALIZE,
 372                 ARG_INTROSPECT
 373         };
 374
 375         static const struct option options[] = {
 376                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 377                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 378                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 379                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 380                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 381                 { "running-as",               required_argument, NULL, ARG_RUNNING_AS               },
 382                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 383                 { "help",                     no_argument,       NULL, 'h'                          },
 384                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 385                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 386                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 387                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 388                 { NULL,                       0,                 NULL, 0                            }
 389         };
 390
 391         int c, r;
 392
 393         assert(argc >= 1);
 394         assert(argv);
 395
 396         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 397
 398                 switch (c) {
 399
 400                 case ARG_LOG_LEVEL:
 401                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 402                                 log_error("Failed to parse log level %s.", optarg);
 403                                 return r;
 404                         }
 405
 406                         break;
 407
 408                 case ARG_LOG_TARGET:
 409
 410                         if ((r = log_set_target_from_string(optarg)) < 0) {
 411                                 log_error("Failed to parse log target %s.", optarg);
 412                                 return r;
 413                         }
 414
 415                         break;
 416
 417                 case ARG_LOG_COLOR:
 418
 419                         if (optarg) {
 420                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 421                                         log_error("Failed to parse log color setting %s.", optarg);
 422                                         return r;
 423                                 }
 424                         } else
 425                                 log_show_color(true);
 426
 427                         break;
 428
 429                 case ARG_LOG_LOCATION:
 430
 431                         if (optarg) {
 432                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 433                                         log_error("Failed to parse log location setting %s.", optarg);
 434                                         return r;
 435                                 }
 436                         } else
 437                                 log_show_location(true);
 438
 439                         break;
 440
 441                 case ARG_UNIT:
 442
 443                         if ((r = set_default_unit(optarg)) < 0) {
 444                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 445                                 return r;
 446                         }
 447
 448                         break;
 449
 450                 case ARG_RUNNING_AS: {
 451                         ManagerRunningAs as;
 452
 453                         if ((as = manager_running_as_from_string(optarg)) < 0) {
 454                                 log_error("Failed to parse running as value %s", optarg);
 455                                 return -EINVAL;
 456                         }
 457
 458                         arg_running_as = as;
 459                         break;
 460                 }
 461
 462                 case ARG_TEST:
 463                         arg_action = ACTION_TEST;
 464                         break;
 465
 466                 case ARG_DUMP_CONFIGURATION_ITEMS:
 467                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 468                         break;
 469
 470                 case ARG_CONFIRM_SPAWN:
 471                         arg_confirm_spawn = true;
 472                         break;
 473
 474                 case ARG_DESERIALIZE: {
 475                         int fd;
 476                         FILE *f;
 477
 478                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 479                                 log_error("Failed to parse deserialize option %s.", optarg);
 480                                 return r;
 481                         }
 482
 483                         if (!(f = fdopen(fd, "r"))) {
 484                                 log_error("Failed to open serialization fd: %m");
 485                                 return r;
 486                         }
 487
 488                         if (serialization)
 489                                 fclose(serialization);
 490
 491                         serialization = f;
 492
 493                         break;
 494                 }
 495
 496                 case ARG_INTROSPECT: {
 497                         const char * const * i = NULL;
 498
 499                         for (i = bus_interface_table; *i; i += 2)
 500                                 if (!optarg || streq(i[0], optarg)) {
 501                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 502                                               "<node>\n", stdout);
 503                                         fputs(i[1], stdout);
 504                                         fputs("</node>\n", stdout);
 505
 506                                         if (optarg)
 507                                                 break;
 508                                 }
 509
 510                         if (!i[0] && optarg)
 511                                 log_error("Unknown interface %s.", optarg);
 512
 513                         arg_action = ACTION_DONE;
 514                         break;
 515                 }
 516
 517                 case 'h':
 518                         arg_action = ACTION_HELP;
 519                         break;
 520
 521                 case '?':
 522                         return -EINVAL;
 523
 524                 default:
 525                         log_error("Unknown option code %c", c);
 526                         return -EINVAL;
 527                 }
 528
 529         /* PID 1 will get the kernel arguments as parameters, which we
 530          * ignore and unconditionally read from
 531          * /proc/cmdline. However, we need to ignore those arguments
 532          * here. */
 533         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 534                 log_error("Excess arguments.");
 535                 return -EINVAL;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int help(void) {
 542
 543         printf("%s [OPTIONS...]\n\n"
 544                "Starts up and maintains the system or a session.\n\n"
 545                "  -h --help                      Show this help\n"
 546                "     --unit=UNIT                 Set default unit\n"
 547                "     --running-as=AS             Set running as (system, session)\n"
 548                "     --test                      Determine startup sequence, dump it and exit\n"
 549                "     --dump-configuration-items  Dump understood unit configuration items\n"
 550                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 551                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 552                "     --log-level=LEVEL           Set log level\n"
 553                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 554                "     --log-color[=0|1]           Highlight important log messages\n"
 555                "     --log-location[=0|1]        Include code location in log messages\n",
 556                program_invocation_short_name);
 557
 558         return 0;
 559 }
 560
 561 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 562         FILE *f = NULL;
 563         FDSet *fds = NULL;
 564         int r;
 565
 566         assert(m);
 567         assert(_f);
 568         assert(_fds);
 569
 570         if ((r = manager_open_serialization(&f)) < 0) {
 571                 log_error("Failed to create serialization faile: %s", strerror(-r));
 572                 goto fail;
 573         }
 574
 575         if (!(fds = fdset_new())) {
 576                 r = -ENOMEM;
 577                 log_error("Failed to allocate fd set: %s", strerror(-r));
 578                 goto fail;
 579         }
 580
 581         if ((r = manager_serialize(m, f, fds)) < 0) {
 582                 log_error("Failed to serialize state: %s", strerror(-r));
 583                 goto fail;
 584         }
 585
 586         if (fseeko(f, 0, SEEK_SET) < 0) {
 587                 log_error("Failed to rewind serialization fd: %m");
 588                 goto fail;
 589         }
 590
 591         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 592                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 593                 goto fail;
 594         }
 595
 596         if ((r = fdset_cloexec(fds, false)) < 0) {
 597                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 598                 goto fail;
 599         }
 600
 601         *_f = f;
 602         *_fds = fds;
 603
 604         return 0;
 605
 606 fail:
 607         fdset_free(fds);
 608
 609         if (f)
 610                 fclose(f);
 611
 612         return r;
 613 }
 614
 615 int main(int argc, char *argv[]) {
 616         Manager *m = NULL;
 617         Unit *target = NULL;
 618         Job *job = NULL;
 619         int r, retval = 1;
 620         FDSet *fds = NULL;
 621         bool reexecute = false;
 622
 623         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 624                 /* This is compatbility support for SysV, where
 625                  * calling init as a user is identical to telinit. */
 626
 627                 errno = -ENOENT;
 628                 execv(SYSTEMCTL_BINARY_PATH, argv);
 629                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 630                 return 1;
 631         }
 632
 633         log_show_color(true);
 634         log_show_location(false);
 635         log_set_max_level(LOG_DEBUG);
 636
 637         if (getpid() == 1) {
 638                 arg_running_as = MANAGER_SYSTEM;
 639                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 640         } else {
 641                 arg_running_as = MANAGER_SESSION;
 642                 log_set_target(LOG_TARGET_CONSOLE);
 643         }
 644
 645         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 646                 goto finish;
 647
 648         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 649          * /proc/$PID/fd is available. */
 650         if (geteuid() == 0)
 651                 if (mount_setup() < 0)
 652                         goto finish;
 653
 654         /* Reset all signal handlers. */
 655         assert_se(reset_all_signal_handlers() == 0);
 656
 657         /* If we are init, we can block sigkill. Yay. */
 658         ignore_signals(SIGNALS_IGNORE, -1);
 659
 660         if (arg_running_as == MANAGER_SYSTEM)
 661                 if (parse_proc_cmdline() < 0)
 662                         goto finish;
 663
 664         log_parse_environment();
 665
 666         if (parse_argv(argc, argv) < 0)
 667                 goto finish;
 668
 669         if (arg_action == ACTION_HELP) {
 670                 retval = help();
 671                 goto finish;
 672         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 673                 unit_dump_config_items(stdout);
 674                 retval = 0;
 675                 goto finish;
 676         } else if (arg_action == ACTION_DONE) {
 677                 retval = 0;
 678                 goto finish;
 679         }
 680
 681         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 682
 683         /* Remember open file descriptors for later deserialization */
 684         if (serialization) {
 685                 if ((r = fdset_new_fill(&fds)) < 0) {
 686                         log_error("Failed to allocate fd set: %s", strerror(-r));
 687                         goto finish;
 688                 }
 689
 690                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 691         } else
 692                 close_all_fds(NULL, 0);
 693
 694         /* Set up PATH unless it is already set */
 695         setenv("PATH",
 696                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 697                arg_running_as == MANAGER_SYSTEM);
 698
 699         /* Move out of the way, so that we won't block unmounts */
 700         assert_se(chdir("/")  == 0);
 701
 702         if (arg_running_as == MANAGER_SYSTEM) {
 703                 /* Become a session leader if we aren't one yet. */
 704                 setsid();
 705
 706                 /* Disable the umask logic */
 707                 umask(0);
 708         }
 709
 710         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 711         dbus_connection_set_change_sigpipe(FALSE);
 712
 713         /* Reset the console, but only if this is really init and we
 714          * are freshly booted */
 715         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 716                 console_setup(getpid() == 1 && !serialization);
 717                 make_null_stdio();
 718         }
 719
 720         /* Open the logging devices, if possible and necessary */
 721         log_open();
 722
 723         /* Make sure we leave a core dump without panicing the
 724          * kernel. */
 725         if (getpid() == 1)
 726                 install_crash_handler();
 727
 728         log_debug(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 729
 730         if (arg_running_as == MANAGER_SYSTEM) {
 731                 modprobe_setup(arg_nomodules);
 732                 kmod_setup();
 733                 hostname_setup();
 734                 loopback_setup();
 735         }
 736
 737         if ((r = manager_new(arg_running_as, arg_confirm_spawn, &m)) < 0) {
 738                 log_error("Failed to allocate manager object: %s", strerror(-r));
 739                 goto finish;
 740         }
 741
 742         if ((r = manager_startup(m, serialization, fds)) < 0)
 743                 log_error("Failed to fully start up daemon: %s", strerror(-r));
 744
 745         if (fds) {
 746                 /* This will close all file descriptors that were opened, but
 747                  * not claimed by any unit. */
 748
 749                 fdset_free(fds);
 750                 fds = NULL;
 751         }
 752
 753         if (serialization) {
 754                 fclose(serialization);
 755                 serialization = NULL;
 756         } else {
 757                 log_debug("Activating default unit: %s", arg_default_unit);
 758
 759                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &target)) < 0) {
 760                         log_error("Failed to load default target: %s", strerror(-r));
 761
 762                         log_info("Trying to load rescue target...");
 763                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
 764                                 log_error("Failed to load rescue target: %s", strerror(-r));
 765                                 goto finish;
 766                         }
 767                 }
 768
 769                 if (arg_action == ACTION_TEST) {
 770                         printf("-> By units:\n");
 771                         manager_dump_units(m, stdout, "\t");
 772                 }
 773
 774                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
 775                         log_error("Failed to start default target: %s", strerror(-r));
 776                         goto finish;
 777                 }
 778
 779                 if (arg_action == ACTION_TEST) {
 780                         printf("-> By jobs:\n");
 781                         manager_dump_jobs(m, stdout, "\t");
 782                         retval = 0;
 783                         goto finish;
 784                 }
 785         }
 786
 787         for (;;) {
 788                 if ((r = manager_loop(m)) < 0) {
 789                         log_error("Failed to run mainloop: %s", strerror(-r));
 790                         goto finish;
 791                 }
 792
 793                 switch (m->exit_code) {
 794
 795                 case MANAGER_EXIT:
 796                         retval = 0;
 797                         log_debug("Exit.");
 798                         goto finish;
 799
 800                 case MANAGER_RELOAD:
 801                         if ((r = manager_reload(m)) < 0)
 802                                 log_error("Failed to reload: %s", strerror(-r));
 803                         break;
 804
 805                 case MANAGER_REEXECUTE:
 806                         if (prepare_reexecute(m, &serialization, &fds) < 0)
 807                                 goto finish;
 808
 809                         reexecute = true;
 810                         log_debug("Reexecuting.");
 811                         goto finish;
 812
 813                 default:
 814                         assert_not_reached("Unknown exit code.");
 815                 }
 816         }
 817
 818 finish:
 819         if (m)
 820                 manager_free(m);
 821
 822         free(arg_default_unit);
 823
 824         dbus_shutdown();
 825
 826         if (reexecute) {
 827                 const char *args[11];
 828                 unsigned i = 0;
 829                 char sfd[16];
 830
 831                 assert(serialization);
 832                 assert(fds);
 833
 834                 args[i++] = SYSTEMD_BINARY_PATH;
 835
 836                 args[i++] = "--log-level";
 837                 args[i++] = log_level_to_string(log_get_max_level());
 838
 839                 args[i++] = "--log-target";
 840                 args[i++] = log_target_to_string(log_get_target());
 841
 842                 args[i++] = "--running-as";
 843                 args[i++] = manager_running_as_to_string(arg_running_as);
 844
 845                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
 846                 char_array_0(sfd);
 847
 848                 args[i++] = "--deserialize";
 849                 args[i++] = sfd;
 850
 851                 if (arg_confirm_spawn)
 852                         args[i++] = "--confirm-spawn";
 853
 854                 args[i++] = NULL;
 855
 856                 assert(i <= ELEMENTSOF(args));
 857
 858                 execv(args[0], (char* const*) args);
 859
 860                 log_error("Failed to reexecute: %m");
 861         }
 862
 863         if (serialization)
 864                 fclose(serialization);
 865
 866         if (fds)
 867                 fdset_free(fds);
 868
 869         if (getpid() == 1)
 870                 freeze();
 871
 872         return retval;
 873 }