1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <dbus/dbus.h>
28 #include <sys/types.h>
34 #include <sys/prctl.h>
35 #include <sys/mount.h>
39 #include "load-fragment.h"
42 #include "conf-parser.h"
43 #include "dbus-common.h"
51 #include "path-util.h"
52 #include "switch-root.h"
53 #include "capability.h"
57 #include "sd-daemon.h"
58 #include "sd-messages.h"
60 #include "mount-setup.h"
61 #include "loopback-setup.h"
63 #include "kmod-setup.h"
65 #include "hostname-setup.h"
66 #include "machine-id-setup.h"
67 #include "locale-setup.h"
68 #include "selinux-setup.h"
69 #include "ima-setup.h"
71 #include "smack-setup.h"
78 ACTION_DUMP_CONFIGURATION_ITEMS,
80 } arg_action = ACTION_RUN;
82 static char *arg_default_unit = NULL;
83 static SystemdRunningAs arg_running_as = _SYSTEMD_RUNNING_AS_INVALID;
85 static bool arg_dump_core = true;
86 static bool arg_crash_shell = false;
87 static int arg_crash_chvt = -1;
88 static bool arg_confirm_spawn = false;
89 static bool arg_show_status = true;
90 static bool arg_switched_root = false;
91 static char **arg_default_controllers = NULL;
92 static char ***arg_join_controllers = NULL;
93 static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL;
94 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
95 static usec_t arg_runtime_watchdog = 0;
96 static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE;
97 static struct rlimit *arg_default_rlimit[RLIMIT_NLIMITS] = {};
98 static uint64_t arg_capability_bounding_set_drop = 0;
99 static nsec_t arg_timer_slack_nsec = (nsec_t) -1;
101 static FILE* serialization = NULL;
103 static void nop_handler(int sig) {
106 _noreturn_ static void crash(int sig) {
109 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
111 struct sigaction sa = {
112 .sa_handler = nop_handler,
113 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
117 /* We want to wait for the core process, hence let's enable SIGCHLD */
118 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
122 log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
125 struct rlimit rl = {};
127 /* Enable default signal handler for core dump */
129 sa.sa_handler = SIG_DFL;
130 assert_se(sigaction(sig, &sa, NULL) == 0);
132 /* Don't limit the core dump size */
133 rl.rlim_cur = RLIM_INFINITY;
134 rl.rlim_max = RLIM_INFINITY;
135 setrlimit(RLIMIT_CORE, &rl);
137 /* Just to be sure... */
138 assert_se(chdir("/") == 0);
140 /* Raise the signal again */
143 assert_not_reached("We shouldn't be here...");
150 /* Order things nicely. */
151 r = wait_for_terminate(pid, &status);
153 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
154 else if (status.si_code != CLD_DUMPED)
155 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
157 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
162 chvt(arg_crash_chvt);
164 if (arg_crash_shell) {
165 struct sigaction sa = {
166 .sa_handler = SIG_IGN,
167 .sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART,
171 log_info("Executing crash shell in 10s...");
174 /* Let the kernel reap children for us */
175 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
179 log_error("Failed to fork off crash shell: %m");
181 make_console_stdio();
182 execl("/bin/sh", "/bin/sh", NULL);
184 log_error("execl() failed: %m");
188 log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid);
191 log_info("Freezing execution.");
195 static void install_crash_handler(void) {
196 struct sigaction sa = {
198 .sa_flags = SA_NODEFER,
201 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
204 static int console_setup(bool do_reset) {
207 /* If we are init, we connect stdin/stdout/stderr to /dev/null
208 * and make sure we don't have a controlling tty. */
215 tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
217 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
221 /* We don't want to force text mode.
222 * plymouth may be showing pictures already from initrd. */
223 r = reset_terminal_fd(tty_fd, false);
225 log_error("Failed to reset /dev/console: %s", strerror(-r));
227 close_nointr_nofail(tty_fd);
231 static int set_default_unit(const char *u) {
240 free(arg_default_unit);
241 arg_default_unit = c;
246 static int parse_proc_cmdline_word(const char *word) {
248 static const char * const rlmap[] = {
249 "emergency", SPECIAL_EMERGENCY_TARGET,
250 "-b", SPECIAL_EMERGENCY_TARGET,
251 "single", SPECIAL_RESCUE_TARGET,
252 "-s", SPECIAL_RESCUE_TARGET,
253 "s", SPECIAL_RESCUE_TARGET,
254 "S", SPECIAL_RESCUE_TARGET,
255 "1", SPECIAL_RESCUE_TARGET,
256 "2", SPECIAL_RUNLEVEL2_TARGET,
257 "3", SPECIAL_RUNLEVEL3_TARGET,
258 "4", SPECIAL_RUNLEVEL4_TARGET,
259 "5", SPECIAL_RUNLEVEL5_TARGET,
264 if (startswith(word, "systemd.unit=")) {
267 return set_default_unit(word + 13);
269 } else if (startswith(word, "rd.systemd.unit=")) {
272 return set_default_unit(word + 16);
274 } else if (startswith(word, "systemd.log_target=")) {
276 if (log_set_target_from_string(word + 19) < 0)
277 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
279 } else if (startswith(word, "systemd.log_level=")) {
281 if (log_set_max_level_from_string(word + 18) < 0)
282 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
284 } else if (startswith(word, "systemd.log_color=")) {
286 if (log_show_color_from_string(word + 18) < 0)
287 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
289 } else if (startswith(word, "systemd.log_location=")) {
291 if (log_show_location_from_string(word + 21) < 0)
292 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
294 } else if (startswith(word, "systemd.dump_core=")) {
297 if ((r = parse_boolean(word + 18)) < 0)
298 log_warning("Failed to parse dump core switch %s. Ignoring.", word + 18);
302 } else if (startswith(word, "systemd.crash_shell=")) {
305 if ((r = parse_boolean(word + 20)) < 0)
306 log_warning("Failed to parse crash shell switch %s. Ignoring.", word + 20);
310 } else if (startswith(word, "systemd.confirm_spawn=")) {
313 if ((r = parse_boolean(word + 22)) < 0)
314 log_warning("Failed to parse confirm spawn switch %s. Ignoring.", word + 22);
316 arg_confirm_spawn = r;
318 } else if (startswith(word, "systemd.crash_chvt=")) {
321 if (safe_atoi(word + 19, &k) < 0)
322 log_warning("Failed to parse crash chvt switch %s. Ignoring.", word + 19);
326 } else if (startswith(word, "systemd.show_status=")) {
329 if ((r = parse_boolean(word + 20)) < 0)
330 log_warning("Failed to parse show status switch %s. Ignoring.", word + 20);
333 } else if (startswith(word, "systemd.default_standard_output=")) {
336 if ((r = exec_output_from_string(word + 32)) < 0)
337 log_warning("Failed to parse default standard output switch %s. Ignoring.", word + 32);
339 arg_default_std_output = r;
340 } else if (startswith(word, "systemd.default_standard_error=")) {
343 if ((r = exec_output_from_string(word + 31)) < 0)
344 log_warning("Failed to parse default standard error switch %s. Ignoring.", word + 31);
346 arg_default_std_error = r;
347 } else if (startswith(word, "systemd.setenv=")) {
348 _cleanup_free_ char *cenv = NULL;
352 cenv = strdup(word + 15);
356 eq = strchr(cenv, '=');
358 if (!env_name_is_valid(cenv))
359 log_warning("Environment variable name '%s' is not valid. Ignoring.", cenv);
363 log_warning("Unsetting environment variable '%s' failed, ignoring: %m", cenv);
366 if (!env_assignment_is_valid(cenv))
367 log_warning("Environment variable assignment '%s' is not valid. Ignoring.", cenv);
370 r = setenv(cenv, eq + 1, 1);
372 log_warning("Setting environment variable '%s=%s' failed, ignoring: %m", cenv, eq + 1);
376 } else if (startswith(word, "systemd.") ||
377 (in_initrd() && startswith(word, "rd.systemd."))) {
381 /* Ignore systemd.journald.xyz and friends */
383 if (startswith(c, "rd."))
385 if (startswith(c, "systemd."))
387 if (c[strcspn(c, ".=")] != '.') {
389 log_warning("Unknown kernel switch %s. Ignoring.", word);
391 log_info("Supported kernel switches:\n"
392 "systemd.unit=UNIT Default unit to start\n"
393 "rd.systemd.unit=UNIT Default unit to start when run in initrd\n"
394 "systemd.dump_core=0|1 Dump core on crash\n"
395 "systemd.crash_shell=0|1 Run shell on crash\n"
396 "systemd.crash_chvt=N Change to VT #N on crash\n"
397 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
398 "systemd.show_status=0|1 Show status updates on the console during bootup\n"
399 "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n"
401 "systemd.log_level=LEVEL Log level\n"
402 "systemd.log_color=0|1 Highlight important log messages\n"
403 "systemd.log_location=0|1 Include code location in log messages\n"
404 "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
405 " Set default log output for services\n"
406 "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
407 " Set default log error output for services\n"
408 "systemd.setenv=ASSIGNMENT Set an environment variable for all spawned processes\n");
411 } else if (streq(word, "quiet"))
412 arg_show_status = false;
413 else if (streq(word, "debug"))
414 log_set_max_level(LOG_DEBUG);
415 else if (!in_initrd()) {
418 /* SysV compatibility */
419 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
420 if (streq(word, rlmap[i]))
421 return set_default_unit(rlmap[i+1]);
427 #define DEFINE_SETTER(name, func, descr) \
428 static int name(const char *unit, \
429 const char *filename, \
431 const char *section, \
432 const char *lvalue, \
434 const char *rvalue, \
446 log_syntax(unit, LOG_ERR, filename, line, -r, \
447 "Invalid " descr "'%s': %s", \
448 rvalue, strerror(-r)); \
453 DEFINE_SETTER(config_parse_level2, log_set_max_level_from_string, "log level")
454 DEFINE_SETTER(config_parse_target, log_set_target_from_string, "target")
455 DEFINE_SETTER(config_parse_color, log_show_color_from_string, "color" )
456 DEFINE_SETTER(config_parse_location, log_show_location_from_string, "location")
459 static int config_parse_cpu_affinity2(const char *unit,
460 const char *filename,
479 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
484 if (!(t = strndup(w, l)))
487 r = safe_atou(t, &cpu);
491 if (!(c = cpu_set_malloc(&ncpus)))
494 if (r < 0 || cpu >= ncpus) {
495 log_syntax(unit, LOG_ERR, filename, line, -r,
496 "Failed to parse CPU affinity '%s'", rvalue);
501 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
505 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
506 log_warning_unit(unit, "Failed to set CPU affinity: %m");
514 static void strv_free_free(char ***l) {
526 static void free_join_controllers(void) {
527 strv_free_free(arg_join_controllers);
528 arg_join_controllers = NULL;
531 static int config_parse_join_controllers(const char *unit,
532 const char *filename,
549 free_join_controllers();
551 FOREACH_WORD_QUOTED(w, length, rvalue, state) {
554 s = strndup(w, length);
558 l = strv_split(s, ",");
563 if (strv_length(l) <= 1) {
568 if (!arg_join_controllers) {
569 arg_join_controllers = new(char**, 2);
570 if (!arg_join_controllers) {
575 arg_join_controllers[0] = l;
576 arg_join_controllers[1] = NULL;
583 t = new0(char**, n+2);
591 for (a = arg_join_controllers; *a; a++) {
593 if (strv_overlap(*a, l)) {
596 c = strv_merge(*a, l);
619 t[n++] = strv_uniq(l);
621 strv_free_free(arg_join_controllers);
622 arg_join_controllers = t;
629 static int parse_config_file(void) {
631 const ConfigTableItem items[] = {
632 { "Manager", "LogLevel", config_parse_level2, 0, NULL },
633 { "Manager", "LogTarget", config_parse_target, 0, NULL },
634 { "Manager", "LogColor", config_parse_color, 0, NULL },
635 { "Manager", "LogLocation", config_parse_location, 0, NULL },
636 { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core },
637 { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell },
638 { "Manager", "ShowStatus", config_parse_bool, 0, &arg_show_status },
639 { "Manager", "CrashChVT", config_parse_int, 0, &arg_crash_chvt },
640 { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL },
641 { "Manager", "DefaultControllers", config_parse_strv, 0, &arg_default_controllers },
642 { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output },
643 { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error },
644 { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers },
645 { "Manager", "RuntimeWatchdogSec", config_parse_sec, 0, &arg_runtime_watchdog },
646 { "Manager", "ShutdownWatchdogSec", config_parse_sec, 0, &arg_shutdown_watchdog },
647 { "Manager", "CapabilityBoundingSet", config_parse_bounding_set, 0, &arg_capability_bounding_set_drop },
648 { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec },
649 { "Manager", "DefaultLimitCPU", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CPU]},
650 { "Manager", "DefaultLimitFSIZE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_FSIZE]},
651 { "Manager", "DefaultLimitDATA", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_DATA]},
652 { "Manager", "DefaultLimitSTACK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_STACK]},
653 { "Manager", "DefaultLimitCORE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CORE]},
654 { "Manager", "DefaultLimitRSS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RSS]},
655 { "Manager", "DefaultLimitNOFILE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NOFILE]},
656 { "Manager", "DefaultLimitAS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_AS]},
657 { "Manager", "DefaultLimitNPROC", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NPROC]},
658 { "Manager", "DefaultLimitMEMLOCK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MEMLOCK]},
659 { "Manager", "DefaultLimitLOCKS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_LOCKS]},
660 { "Manager", "DefaultLimitSIGPENDING",config_parse_limit, 0, &arg_default_rlimit[RLIMIT_SIGPENDING]},
661 { "Manager", "DefaultLimitMSGQUEUE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MSGQUEUE]},
662 { "Manager", "DefaultLimitNICE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NICE]},
663 { "Manager", "DefaultLimitRTPRIO", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTPRIO]},
664 { "Manager", "DefaultLimitRTTIME", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTTIME]},
665 { NULL, NULL, NULL, 0, NULL }
668 _cleanup_fclose_ FILE *f;
672 fn = arg_running_as == SYSTEMD_SYSTEM ? PKGSYSCONFDIR "/system.conf" : PKGSYSCONFDIR "/user.conf";
678 log_warning("Failed to open configuration file '%s': %m", fn);
682 r = config_parse(NULL, fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, false, NULL);
684 log_warning("Failed to parse configuration file: %s", strerror(-r));
689 static int parse_proc_cmdline(void) {
690 _cleanup_free_ char *line = NULL;
695 /* Don't read /proc/cmdline if we are in a container, since
696 * that is only relevant for the host system */
697 if (detect_container(NULL) > 0)
700 r = read_one_line_file("/proc/cmdline", &line);
702 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
706 FOREACH_WORD_QUOTED(w, l, line, state) {
707 _cleanup_free_ char *word;
709 word = strndup(w, l);
713 r = parse_proc_cmdline_word(word);
715 log_error("Failed on cmdline argument %s: %s", word, strerror(-r));
723 static int parse_argv(int argc, char *argv[]) {
726 ARG_LOG_LEVEL = 0x100,
735 ARG_DUMP_CONFIGURATION_ITEMS,
743 ARG_DEFAULT_STD_OUTPUT,
744 ARG_DEFAULT_STD_ERROR
747 static const struct option options[] = {
748 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
749 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
750 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
751 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
752 { "unit", required_argument, NULL, ARG_UNIT },
753 { "system", no_argument, NULL, ARG_SYSTEM },
754 { "user", no_argument, NULL, ARG_USER },
755 { "test", no_argument, NULL, ARG_TEST },
756 { "help", no_argument, NULL, 'h' },
757 { "version", no_argument, NULL, ARG_VERSION },
758 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
759 { "dump-core", optional_argument, NULL, ARG_DUMP_CORE },
760 { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL },
761 { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN },
762 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
763 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
764 { "switched-root", no_argument, NULL, ARG_SWITCHED_ROOT },
765 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
766 { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },
767 { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },
779 while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
784 if ((r = log_set_max_level_from_string(optarg)) < 0) {
785 log_error("Failed to parse log level %s.", optarg);
793 if ((r = log_set_target_from_string(optarg)) < 0) {
794 log_error("Failed to parse log target %s.", optarg);
803 if ((r = log_show_color_from_string(optarg)) < 0) {
804 log_error("Failed to parse log color setting %s.", optarg);
808 log_show_color(true);
812 case ARG_LOG_LOCATION:
815 if ((r = log_show_location_from_string(optarg)) < 0) {
816 log_error("Failed to parse log location setting %s.", optarg);
820 log_show_location(true);
824 case ARG_DEFAULT_STD_OUTPUT:
826 if ((r = exec_output_from_string(optarg)) < 0) {
827 log_error("Failed to parse default standard output setting %s.", optarg);
830 arg_default_std_output = r;
833 case ARG_DEFAULT_STD_ERROR:
835 if ((r = exec_output_from_string(optarg)) < 0) {
836 log_error("Failed to parse default standard error output setting %s.", optarg);
839 arg_default_std_error = r;
844 if ((r = set_default_unit(optarg)) < 0) {
845 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
852 arg_running_as = SYSTEMD_SYSTEM;
856 arg_running_as = SYSTEMD_USER;
860 arg_action = ACTION_TEST;
864 arg_action = ACTION_VERSION;
867 case ARG_DUMP_CONFIGURATION_ITEMS:
868 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
872 r = optarg ? parse_boolean(optarg) : 1;
874 log_error("Failed to parse dump core boolean %s.", optarg);
880 case ARG_CRASH_SHELL:
881 r = optarg ? parse_boolean(optarg) : 1;
883 log_error("Failed to parse crash shell boolean %s.", optarg);
889 case ARG_CONFIRM_SPAWN:
890 r = optarg ? parse_boolean(optarg) : 1;
892 log_error("Failed to parse confirm spawn boolean %s.", optarg);
895 arg_confirm_spawn = r;
898 case ARG_SHOW_STATUS:
899 r = optarg ? parse_boolean(optarg) : 1;
901 log_error("Failed to parse show status boolean %s.", optarg);
907 case ARG_DESERIALIZE: {
911 r = safe_atoi(optarg, &fd);
912 if (r < 0 || fd < 0) {
913 log_error("Failed to parse deserialize option %s.", optarg);
914 return r < 0 ? r : -EINVAL;
917 fd_cloexec(fd, true);
921 log_error("Failed to open serialization fd: %m");
926 fclose(serialization);
933 case ARG_SWITCHED_ROOT:
934 arg_switched_root = true;
937 case ARG_INTROSPECT: {
938 const char * const * i = NULL;
940 for (i = bus_interface_table; *i; i += 2)
941 if (!optarg || streq(i[0], optarg)) {
942 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
945 fputs("</node>\n", stdout);
952 log_error("Unknown interface %s.", optarg);
954 arg_action = ACTION_DONE;
959 arg_action = ACTION_HELP;
963 log_set_max_level(LOG_DEBUG);
969 /* Just to eat away the sysvinit kernel
970 * cmdline args without getopt() error
971 * messages that we'll parse in
972 * parse_proc_cmdline_word() or ignore. */
977 log_error("Unknown option code %c", c);
984 if (optind < argc && getpid() != 1) {
985 /* Hmm, when we aren't run as init system
986 * let's complain about excess arguments */
988 log_error("Excess arguments.");
992 if (detect_container(NULL) > 0) {
995 /* All /proc/cmdline arguments the kernel didn't
996 * understand it passed to us. We're not really
997 * interested in that usually since /proc/cmdline is
998 * more interesting and complete. With one exception:
999 * if we are run in a container /proc/cmdline is not
1000 * relevant for the container, hence we rely on argv[]
1003 for (a = argv; a < argv + argc; a++)
1004 if ((r = parse_proc_cmdline_word(*a)) < 0) {
1005 log_error("Failed on cmdline argument %s: %s", *a, strerror(-r));
1013 static int help(void) {
1015 printf("%s [OPTIONS...]\n\n"
1016 "Starts up and maintains the system or user services.\n\n"
1017 " -h --help Show this help\n"
1018 " --test Determine startup sequence, dump it and exit\n"
1019 " --dump-configuration-items Dump understood unit configuration items\n"
1020 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
1021 " --unit=UNIT Set default unit\n"
1022 " --system Run a system instance, even if PID != 1\n"
1023 " --user Run a user instance\n"
1024 " --dump-core[=0|1] Dump core on crash\n"
1025 " --crash-shell[=0|1] Run shell on crash\n"
1026 " --confirm-spawn[=0|1] Ask for confirmation when spawning processes\n"
1027 " --show-status[=0|1] Show status updates on the console during bootup\n"
1028 " --log-target=TARGET Set log target (console, journal, syslog, kmsg, journal-or-kmsg, syslog-or-kmsg, null)\n"
1029 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
1030 " --log-color[=0|1] Highlight important log messages\n"
1031 " --log-location[=0|1] Include code location in log messages\n"
1032 " --default-standard-output= Set default standard output for services\n"
1033 " --default-standard-error= Set default standard error output for services\n",
1034 program_invocation_short_name);
1039 static int version(void) {
1040 puts(PACKAGE_STRING);
1041 puts(SYSTEMD_FEATURES);
1046 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds, bool switching_root) {
1055 /* Make sure nothing is really destructed when we shut down */
1058 r = manager_open_serialization(m, &f);
1060 log_error("Failed to create serialization file: %s", strerror(-r));
1067 log_error("Failed to allocate fd set: %s", strerror(-r));
1071 r = manager_serialize(m, f, fds, switching_root);
1073 log_error("Failed to serialize state: %s", strerror(-r));
1077 if (fseeko(f, 0, SEEK_SET) < 0) {
1078 log_error("Failed to rewind serialization fd: %m");
1082 r = fd_cloexec(fileno(f), false);
1084 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
1088 r = fdset_cloexec(fds, false);
1090 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
1108 static int bump_rlimit_nofile(struct rlimit *saved_rlimit) {
1112 assert(saved_rlimit);
1114 /* Save the original RLIMIT_NOFILE so that we can reset it
1115 * later when transitioning from the initrd to the main
1116 * systemd or suchlike. */
1117 if (getrlimit(RLIMIT_NOFILE, saved_rlimit) < 0) {
1118 log_error("Reading RLIMIT_NOFILE failed: %m");
1122 /* Make sure forked processes get the default kernel setting */
1123 if (!arg_default_rlimit[RLIMIT_NOFILE]) {
1126 rl = newdup(struct rlimit, saved_rlimit, 1);
1130 arg_default_rlimit[RLIMIT_NOFILE] = rl;
1133 /* Bump up the resource limit for ourselves substantially */
1134 nl.rlim_cur = nl.rlim_max = 64*1024;
1135 r = setrlimit_closest(RLIMIT_NOFILE, &nl);
1137 log_error("Setting RLIMIT_NOFILE failed: %s", strerror(-r));
1144 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
1146 unsigned long long a, b;
1150 e = getenv("RD_TIMESTAMP");
1154 if (sscanf(e, "%llu %llu", &a, &b) != 2)
1157 t->realtime = (usec_t) a;
1158 t->monotonic = (usec_t) b;
1163 static void test_mtab(void) {
1166 /* Check that /etc/mtab is a symlink */
1168 if (readlink_malloc("/etc/mtab", &p) >= 0) {
1171 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
1178 log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
1179 "This is not supported anymore. "
1180 "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
1183 static void test_usr(void) {
1185 /* Check that /usr is not a separate fs */
1187 if (dir_is_empty("/usr") <= 0)
1190 log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. "
1191 "Some things will probably break (sometimes even silently) in mysterious ways. "
1192 "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1195 static void test_cgroups(void) {
1197 if (access("/proc/cgroups", F_OK) >= 0)
1200 log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. "
1201 "Systems without control groups are not supported. "
1202 "We will now sleep for 10s, and then continue boot-up. "
1203 "Expect breakage and please do not file bugs. "
1204 "Instead fix your kernel and enable CONFIG_CGROUPS. "
1205 "Consult http://0pointer.de/blog/projects/cgroups-vs-cgroups.html for more information.");
1210 static int initialize_join_controllers(void) {
1211 /* By default, mount "cpu" + "cpuacct" together, and "net_cls"
1212 * + "net_prio". We'd like to add "cpuset" to the mix, but
1213 * "cpuset" does't really work for groups with no initialized
1216 arg_join_controllers = new(char**, 3);
1217 if (!arg_join_controllers)
1220 arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL);
1221 arg_join_controllers[1] = strv_new("net_cls", "net_prio", NULL);
1222 arg_join_controllers[2] = NULL;
1224 if (!arg_join_controllers[0] || !arg_join_controllers[1]) {
1225 free_join_controllers();
1232 int main(int argc, char *argv[]) {
1234 int r, retval = EXIT_FAILURE;
1235 usec_t before_startup, after_startup;
1236 char timespan[FORMAT_TIMESPAN_MAX];
1238 bool reexecute = false;
1239 const char *shutdown_verb = NULL;
1240 dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
1241 dual_timestamp userspace_timestamp = { 0ULL, 0ULL };
1242 dual_timestamp kernel_timestamp = { 0ULL, 0ULL };
1243 static char systemd[] = "systemd";
1244 bool skip_setup = false;
1246 bool loaded_policy = false;
1247 bool arm_reboot_watchdog = false;
1248 bool queue_default_job = false;
1249 char *switch_root_dir = NULL, *switch_root_init = NULL;
1250 static struct rlimit saved_rlimit_nofile = { 0, 0 };
1252 #ifdef HAVE_SYSV_COMPAT
1253 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
1254 /* This is compatibility support for SysV, where
1255 * calling init as a user is identical to telinit. */
1258 execv(SYSTEMCTL_BINARY_PATH, argv);
1259 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1264 dual_timestamp_from_monotonic(&kernel_timestamp, 0);
1265 dual_timestamp_get(&userspace_timestamp);
1267 /* Determine if this is a reexecution or normal bootup. We do
1268 * the full command line parsing much later, so let's just
1269 * have a quick peek here. */
1270 if (strv_find(argv+1, "--deserialize"))
1273 /* If we have switched root, do all the special setup
1275 if (strv_find(argv+1, "--switched-root"))
1278 /* If we get started via the /sbin/init symlink then we are
1279 called 'init'. After a subsequent reexecution we are then
1280 called 'systemd'. That is confusing, hence let's call us
1281 systemd right-away. */
1282 program_invocation_short_name = systemd;
1283 prctl(PR_SET_NAME, systemd);
1288 log_show_color(isatty(STDERR_FILENO) > 0);
1290 if (getpid() == 1 && detect_container(NULL) <= 0) {
1292 /* Running outside of a container as PID 1 */
1293 arg_running_as = SYSTEMD_SYSTEM;
1295 log_set_target(LOG_TARGET_KMSG);
1299 char *rd_timestamp = NULL;
1301 initrd_timestamp = userspace_timestamp;
1302 asprintf(&rd_timestamp, "%llu %llu",
1303 (unsigned long long) initrd_timestamp.realtime,
1304 (unsigned long long) initrd_timestamp.monotonic);
1306 setenv("RD_TIMESTAMP", rd_timestamp, 1);
1312 mount_setup_early();
1313 if (selinux_setup(&loaded_policy) < 0)
1315 if (ima_setup() < 0)
1317 if (smack_setup() < 0)
1321 if (label_init(NULL) < 0)
1325 if (hwclock_is_localtime() > 0) {
1328 /* The first-time call to settimeofday() does a time warp in the kernel */
1329 r = hwclock_set_timezone(&min);
1331 log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
1333 log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1334 } else if (!in_initrd()) {
1336 * Do dummy first-time call to seal the kernel's time warp magic
1338 * Do not call this this from inside the initrd. The initrd might not
1339 * carry /etc/adjtime with LOCAL, but the real system could be set up
1340 * that way. In such case, we need to delay the time-warp or the sealing
1341 * until we reach the real system.
1343 hwclock_reset_timezone();
1345 /* Tell the kernel our time zone */
1346 r = hwclock_set_timezone(NULL);
1348 log_error("Failed to set the kernel's time zone, ignoring: %s", strerror(-r));
1352 /* Set the default for later on, but don't actually
1353 * open the logs like this for now. Note that if we
1354 * are transitioning from the initrd there might still
1355 * be journal fd open, and we shouldn't attempt
1356 * opening that before we parsed /proc/cmdline which
1357 * might redirect output elsewhere. */
1358 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
1360 } else if (getpid() == 1) {
1361 /* Running inside a container, as PID 1 */
1362 arg_running_as = SYSTEMD_SYSTEM;
1363 log_set_target(LOG_TARGET_CONSOLE);
1366 /* For the later on, see above... */
1367 log_set_target(LOG_TARGET_JOURNAL);
1369 /* clear the kernel timestamp,
1370 * because we are in a container */
1371 kernel_timestamp.monotonic = 0ULL;
1372 kernel_timestamp.realtime = 0ULL;
1375 /* Running as user instance */
1376 arg_running_as = SYSTEMD_USER;
1377 log_set_target(LOG_TARGET_AUTO);
1380 /* clear the kernel timestamp,
1381 * because we are not PID 1 */
1382 kernel_timestamp.monotonic = 0ULL;
1383 kernel_timestamp.realtime = 0ULL;
1386 /* Initialize default unit */
1387 r = set_default_unit(SPECIAL_DEFAULT_TARGET);
1389 log_error("Failed to set default unit %s: %s", SPECIAL_DEFAULT_TARGET, strerror(-r));
1393 r = initialize_join_controllers();
1397 /* Mount /proc, /sys and friends, so that /proc/cmdline and
1398 * /proc/$PID/fd is available. */
1399 if (getpid() == 1) {
1400 r = mount_setup(loaded_policy);
1405 /* Reset all signal handlers. */
1406 assert_se(reset_all_signal_handlers() == 0);
1408 ignore_signals(SIGNALS_IGNORE, -1);
1410 if (parse_config_file() < 0)
1413 if (arg_running_as == SYSTEMD_SYSTEM)
1414 if (parse_proc_cmdline() < 0)
1417 log_parse_environment();
1419 if (parse_argv(argc, argv) < 0)
1422 if (arg_action == ACTION_TEST &&
1424 log_error("Don't run test mode as root.");
1428 if (arg_running_as == SYSTEMD_USER &&
1429 arg_action == ACTION_RUN &&
1431 log_error("Trying to run as user instance, but the system has not been booted with systemd.");
1435 if (arg_running_as == SYSTEMD_SYSTEM &&
1436 arg_action == ACTION_RUN &&
1437 running_in_chroot() > 0) {
1438 log_error("Cannot be run in a chroot() environment.");
1442 if (arg_action == ACTION_HELP) {
1445 } else if (arg_action == ACTION_VERSION) {
1448 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1449 unit_dump_config_items(stdout);
1450 retval = EXIT_SUCCESS;
1452 } else if (arg_action == ACTION_DONE) {
1453 retval = EXIT_SUCCESS;
1457 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1459 /* Close logging fds, in order not to confuse fdset below */
1462 /* Remember open file descriptors for later deserialization */
1463 r = fdset_new_fill(&fds);
1465 log_error("Failed to allocate fd set: %s", strerror(-r));
1468 fdset_cloexec(fds, true);
1471 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1473 /* Set up PATH unless it is already set */
1475 #ifdef HAVE_SPLIT_USR
1476 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1478 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin",
1480 arg_running_as == SYSTEMD_SYSTEM);
1482 if (arg_running_as == SYSTEMD_SYSTEM) {
1483 /* Parse the data passed to us. We leave this
1484 * variables set, but the manager later on will not
1485 * pass them on to our children. */
1487 parse_initrd_timestamp(&initrd_timestamp);
1489 /* Unset some environment variables passed in from the
1490 * kernel that don't really make sense for us. */
1494 /* When we are invoked by a shell, these might be set,
1495 * but make little sense to pass on */
1500 /* When we are invoked by a chroot-like tool such as
1501 * nspawn, these might be set, but make little sense
1504 unsetenv("LOGNAME");
1506 /* We suppress the socket activation env vars, as
1507 * we'll try to match *any* open fd to units if
1509 unsetenv("LISTEN_FDS");
1510 unsetenv("LISTEN_PID");
1512 /* All other variables are left as is, so that clients
1513 * can still read them via /proc/1/environ */
1516 /* Move out of the way, so that we won't block unmounts */
1517 assert_se(chdir("/") == 0);
1519 if (arg_running_as == SYSTEMD_SYSTEM) {
1520 /* Become a session leader if we aren't one yet. */
1523 /* Disable the umask logic */
1527 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1528 dbus_connection_set_change_sigpipe(FALSE);
1530 /* Reset the console, but only if this is really init and we
1531 * are freshly booted */
1532 if (arg_running_as == SYSTEMD_SYSTEM && arg_action == ACTION_RUN)
1533 console_setup(getpid() == 1 && !skip_setup);
1535 /* Open the logging devices, if possible and necessary */
1538 /* Make sure we leave a core dump without panicing the
1540 if (getpid() == 1) {
1541 install_crash_handler();
1543 r = mount_cgroup_controllers(arg_join_controllers);
1548 if (arg_running_as == SYSTEMD_SYSTEM) {
1549 const char *virtualization = NULL;
1551 log_info(PACKAGE_STRING " running in system mode. (" SYSTEMD_FEATURES ")");
1553 detect_virtualization(&virtualization);
1555 log_info("Detected virtualization '%s'.", virtualization);
1558 log_info("Running in initial RAM disk.");
1561 log_debug(PACKAGE_STRING " running in user mode. (" SYSTEMD_FEATURES ")");
1563 if (arg_running_as == SYSTEMD_SYSTEM && !skip_setup) {
1566 if (arg_show_status || plymouth_running())
1581 if (arg_running_as == SYSTEMD_SYSTEM && arg_runtime_watchdog > 0)
1582 watchdog_set_timeout(&arg_runtime_watchdog);
1584 if (arg_timer_slack_nsec != (nsec_t) -1)
1585 if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0)
1586 log_error("Failed to adjust timer slack: %m");
1588 if (arg_capability_bounding_set_drop) {
1589 r = capability_bounding_set_drop(arg_capability_bounding_set_drop, true);
1591 log_error("Failed to drop capability bounding set: %s", strerror(-r));
1594 r = capability_bounding_set_drop_usermode(arg_capability_bounding_set_drop);
1596 log_error("Failed to drop capability bounding set of usermode helpers: %s", strerror(-r));
1601 if (arg_running_as == SYSTEMD_USER) {
1602 /* Become reaper of our children */
1603 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) {
1604 log_warning("Failed to make us a subreaper: %m");
1605 if (errno == EINVAL)
1606 log_info("Perhaps the kernel version is too old (< 3.4?)");
1610 if (arg_running_as == SYSTEMD_SYSTEM)
1611 bump_rlimit_nofile(&saved_rlimit_nofile);
1613 r = manager_new(arg_running_as, &m);
1615 log_error("Failed to allocate manager object: %s", strerror(-r));
1619 m->confirm_spawn = arg_confirm_spawn;
1620 m->default_std_output = arg_default_std_output;
1621 m->default_std_error = arg_default_std_error;
1622 m->runtime_watchdog = arg_runtime_watchdog;
1623 m->shutdown_watchdog = arg_shutdown_watchdog;
1624 m->userspace_timestamp = userspace_timestamp;
1625 m->kernel_timestamp = kernel_timestamp;
1626 m->initrd_timestamp = initrd_timestamp;
1628 manager_set_default_rlimits(m, arg_default_rlimit);
1630 if (arg_default_controllers)
1631 manager_set_default_controllers(m, arg_default_controllers);
1633 manager_set_show_status(m, arg_show_status);
1635 /* Remember whether we should queue the default job */
1636 queue_default_job = !serialization || arg_switched_root;
1638 before_startup = now(CLOCK_MONOTONIC);
1640 r = manager_startup(m, serialization, fds);
1642 log_error("Failed to fully start up daemon: %s", strerror(-r));
1644 /* This will close all file descriptors that were opened, but
1645 * not claimed by any unit. */
1648 if (serialization) {
1649 fclose(serialization);
1650 serialization = NULL;
1653 if (queue_default_job) {
1655 Unit *target = NULL;
1656 Job *default_unit_job;
1658 dbus_error_init(&error);
1660 log_debug("Activating default unit: %s", arg_default_unit);
1662 r = manager_load_unit(m, arg_default_unit, NULL, &error, &target);
1664 log_error("Failed to load default target: %s", bus_error(&error, r));
1665 dbus_error_free(&error);
1666 } else if (target->load_state == UNIT_ERROR)
1667 log_error("Failed to load default target: %s", strerror(-target->load_error));
1668 else if (target->load_state == UNIT_MASKED)
1669 log_error("Default target masked.");
1671 if (!target || target->load_state != UNIT_LOADED) {
1672 log_info("Trying to load rescue target...");
1674 r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target);
1676 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1677 dbus_error_free(&error);
1679 } else if (target->load_state == UNIT_ERROR) {
1680 log_error("Failed to load rescue target: %s", strerror(-target->load_error));
1682 } else if (target->load_state == UNIT_MASKED) {
1683 log_error("Rescue target masked.");
1688 assert(target->load_state == UNIT_LOADED);
1690 if (arg_action == ACTION_TEST) {
1691 printf("-> By units:\n");
1692 manager_dump_units(m, stdout, "\t");
1695 r = manager_add_job(m, JOB_START, target, JOB_ISOLATE, false, &error, &default_unit_job);
1697 log_debug("Default target could not be isolated, starting instead: %s", bus_error(&error, r));
1698 dbus_error_free(&error);
1700 r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &default_unit_job);
1702 log_error("Failed to start default target: %s", bus_error(&error, r));
1703 dbus_error_free(&error);
1707 log_error("Failed to isolate default target: %s", bus_error(&error, r));
1708 dbus_error_free(&error);
1712 m->default_unit_job_id = default_unit_job->id;
1714 after_startup = now(CLOCK_MONOTONIC);
1715 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
1716 "Loaded units and determined initial transaction in %s.",
1717 format_timespan(timespan, sizeof(timespan), after_startup - before_startup, 0));
1719 if (arg_action == ACTION_TEST) {
1720 printf("-> By jobs:\n");
1721 manager_dump_jobs(m, stdout, "\t");
1722 retval = EXIT_SUCCESS;
1728 r = manager_loop(m);
1730 log_error("Failed to run mainloop: %s", strerror(-r));
1734 switch (m->exit_code) {
1737 retval = EXIT_SUCCESS;
1741 case MANAGER_RELOAD:
1742 log_info("Reloading.");
1743 r = manager_reload(m);
1745 log_error("Failed to reload: %s", strerror(-r));
1748 case MANAGER_REEXECUTE:
1750 if (prepare_reexecute(m, &serialization, &fds, false) < 0)
1754 log_notice("Reexecuting.");
1757 case MANAGER_SWITCH_ROOT:
1758 /* Steal the switch root parameters */
1759 switch_root_dir = m->switch_root;
1760 switch_root_init = m->switch_root_init;
1761 m->switch_root = m->switch_root_init = NULL;
1763 if (!switch_root_init)
1764 if (prepare_reexecute(m, &serialization, &fds, true) < 0)
1768 log_notice("Switching root.");
1771 case MANAGER_REBOOT:
1772 case MANAGER_POWEROFF:
1774 case MANAGER_KEXEC: {
1775 static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1776 [MANAGER_REBOOT] = "reboot",
1777 [MANAGER_POWEROFF] = "poweroff",
1778 [MANAGER_HALT] = "halt",
1779 [MANAGER_KEXEC] = "kexec"
1782 assert_se(shutdown_verb = table[m->exit_code]);
1783 arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT;
1785 log_notice("Shutting down.");
1790 assert_not_reached("Unknown exit code.");
1798 for (j = 0; j < RLIMIT_NLIMITS; j++)
1799 free(arg_default_rlimit[j]);
1801 free(arg_default_unit);
1802 strv_free(arg_default_controllers);
1803 free_join_controllers();
1810 unsigned i, args_size;
1812 /* Close and disarm the watchdog, so that the new
1813 * instance can reinitialize it, but doesn't get
1814 * rebooted while we do that */
1815 watchdog_close(true);
1817 /* Reset the RLIMIT_NOFILE to the kernel default, so
1818 * that the new systemd can pass the kernel default to
1819 * its child processes */
1820 if (saved_rlimit_nofile.rlim_cur > 0)
1821 setrlimit(RLIMIT_NOFILE, &saved_rlimit_nofile);
1823 if (switch_root_dir) {
1824 /* Kill all remaining processes from the
1825 * initrd, but don't wait for them, so that we
1826 * can handle the SIGCHLD for them after
1828 broadcast_signal(SIGTERM, false);
1830 /* And switch root */
1831 r = switch_root(switch_root_dir);
1833 log_error("Failed to switch root, ignoring: %s", strerror(-r));
1836 args_size = MAX(6, argc+1);
1837 args = newa(const char*, args_size);
1839 if (!switch_root_init) {
1842 /* First try to spawn ourselves with the right
1843 * path, and with full serialization. We do
1844 * this only if the user didn't specify an
1845 * explicit init to spawn. */
1847 assert(serialization);
1850 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1854 args[i++] = SYSTEMD_BINARY_PATH;
1855 if (switch_root_dir)
1856 args[i++] = "--switched-root";
1857 args[i++] = arg_running_as == SYSTEMD_SYSTEM ? "--system" : "--user";
1858 args[i++] = "--deserialize";
1862 assert(i <= args_size);
1863 execv(args[0], (char* const*) args);
1866 /* Try the fallback, if there is any, without any
1867 * serialization. We pass the original argv[] and
1868 * envp[]. (Well, modulo the ordering changes due to
1869 * getopt() in argv[], and some cleanups in envp[],
1870 * but let's hope that doesn't matter.) */
1872 if (serialization) {
1873 fclose(serialization);
1874 serialization = NULL;
1882 /* Reopen the console */
1883 make_console_stdio();
1885 for (j = 1, i = 1; j < argc; j++)
1886 args[i++] = argv[j];
1888 assert(i <= args_size);
1890 if (switch_root_init) {
1891 args[0] = switch_root_init;
1892 execv(args[0], (char* const*) args);
1893 log_warning("Failed to execute configured init, trying fallback: %m");
1896 args[0] = "/sbin/init";
1897 execv(args[0], (char* const*) args);
1899 if (errno == ENOENT) {
1900 log_warning("No /sbin/init, trying fallback");
1902 args[0] = "/bin/sh";
1904 execv(args[0], (char* const*) args);
1905 log_error("Failed to execute /bin/sh, giving up: %m");
1907 log_warning("Failed to execute /sbin/init, giving up: %m");
1911 fclose(serialization);
1916 if (shutdown_verb) {
1917 const char * command_line[] = {
1918 SYSTEMD_SHUTDOWN_BINARY_PATH,
1924 if (arm_reboot_watchdog && arg_shutdown_watchdog > 0) {
1927 /* If we reboot let's set the shutdown
1928 * watchdog and tell the shutdown binary to
1929 * repeatedly ping it */
1930 watchdog_set_timeout(&arg_shutdown_watchdog);
1931 watchdog_close(false);
1933 /* Tell the binary how often to ping */
1934 snprintf(e, sizeof(e), "WATCHDOG_USEC=%llu", (unsigned long long) arg_shutdown_watchdog);
1937 env_block = strv_append(environ, e);
1939 env_block = strv_copy(environ);
1940 watchdog_close(true);
1943 execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block);
1945 log_error("Failed to execute shutdown binary, freezing: %m");