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 "bus-errors.h"
51 #include "path-util.h"
52 #include "switch-root.h"
53 #include "capability.h"
57 #include "sd-daemon.h"
59 #include "mount-setup.h"
60 #include "loopback-setup.h"
62 #include "kmod-setup.h"
64 #include "hostname-setup.h"
65 #include "machine-id-setup.h"
66 #include "locale-setup.h"
67 #include "selinux-setup.h"
68 #include "ima-setup.h"
70 #include "smack-setup.h"
77 ACTION_DUMP_CONFIGURATION_ITEMS,
79 } arg_action = ACTION_RUN;
81 static char *arg_default_unit = NULL;
82 static SystemdRunningAs arg_running_as = _SYSTEMD_RUNNING_AS_INVALID;
84 static bool arg_dump_core = true;
85 static bool arg_crash_shell = false;
86 static int arg_crash_chvt = -1;
87 static bool arg_confirm_spawn = false;
88 static bool arg_show_status = true;
89 static bool arg_switched_root = false;
90 static char **arg_default_controllers = NULL;
91 static char ***arg_join_controllers = NULL;
92 static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL;
93 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
94 static usec_t arg_runtime_watchdog = 0;
95 static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE;
96 static struct rlimit *arg_default_rlimit[RLIMIT_NLIMITS] = {};
97 static uint64_t arg_capability_bounding_set_drop = 0;
98 static nsec_t arg_timer_slack_nsec = (nsec_t) -1;
100 static FILE* serialization = NULL;
102 static void nop_handler(int sig) {
105 _noreturn_ static void crash(int sig) {
108 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
113 /* We want to wait for the core process, hence let's enable SIGCHLD */
115 sa.sa_handler = nop_handler;
116 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
117 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
121 log_error("Caught <%s>, cannot fork for core dump: %s",
122 signal_to_string(sig), strerror(errno));
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 */
134 rl.rlim_cur = RLIM_INFINITY;
135 rl.rlim_max = RLIM_INFINITY;
136 setrlimit(RLIMIT_CORE, &rl);
138 /* Just to be sure... */
139 assert_se(chdir("/") == 0);
141 /* Raise the signal again */
144 assert_not_reached("We shouldn't be here...");
151 /* Order things nicely. */
152 r = wait_for_terminate(pid, &status);
154 log_error("Caught <%s>, waitpid() failed: %s",
155 signal_to_string(sig), strerror(-r));
156 else if (status.si_code != CLD_DUMPED)
157 log_error("Caught <%s>, core dump failed.",
158 signal_to_string(sig));
160 log_error("Caught <%s>, dumped core as pid %lu.",
161 signal_to_string(sig),
162 (unsigned long) pid);
167 chvt(arg_crash_chvt);
169 if (arg_crash_shell) {
173 log_info("Executing crash shell in 10s...");
176 /* Let the kernel reap children for us */
178 sa.sa_handler = SIG_IGN;
179 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
180 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
184 log_error("Failed to fork off crash shell: %m");
186 make_console_stdio();
187 execl("/bin/sh", "/bin/sh", NULL);
189 log_error("execl() failed: %m");
193 log_info("Successfully spawned crash shell as pid %lu.",
194 (unsigned long) pid);
197 log_info("Freezing execution.");
201 static void install_crash_handler(void) {
206 sa.sa_handler = crash;
207 sa.sa_flags = SA_NODEFER;
209 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
212 static int console_setup(bool do_reset) {
215 /* If we are init, we connect stdin/stdout/stderr to /dev/null
216 * and make sure we don't have a controlling tty. */
223 tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
225 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
229 /* We don't want to force text mode.
230 * plymouth may be showing pictures already from initrd. */
231 r = reset_terminal_fd(tty_fd, false);
233 log_error("Failed to reset /dev/console: %s", strerror(-r));
235 close_nointr_nofail(tty_fd);
239 static int set_default_unit(const char *u) {
248 free(arg_default_unit);
249 arg_default_unit = c;
254 static int parse_proc_cmdline_word(const char *word) {
256 static const char * const rlmap[] = {
257 "emergency", SPECIAL_EMERGENCY_TARGET,
258 "-b", SPECIAL_EMERGENCY_TARGET,
259 "single", SPECIAL_RESCUE_TARGET,
260 "-s", SPECIAL_RESCUE_TARGET,
261 "s", SPECIAL_RESCUE_TARGET,
262 "S", SPECIAL_RESCUE_TARGET,
263 "1", SPECIAL_RESCUE_TARGET,
264 "2", SPECIAL_RUNLEVEL2_TARGET,
265 "3", SPECIAL_RUNLEVEL3_TARGET,
266 "4", SPECIAL_RUNLEVEL4_TARGET,
267 "5", SPECIAL_RUNLEVEL5_TARGET,
272 if (startswith(word, "systemd.unit=")) {
275 return set_default_unit(word + 13);
277 } else if (startswith(word, "rd.systemd.unit=")) {
280 return set_default_unit(word + 16);
282 } else if (startswith(word, "systemd.log_target=")) {
284 if (log_set_target_from_string(word + 19) < 0)
285 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
287 } else if (startswith(word, "systemd.log_level=")) {
289 if (log_set_max_level_from_string(word + 18) < 0)
290 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
292 } else if (startswith(word, "systemd.log_color=")) {
294 if (log_show_color_from_string(word + 18) < 0)
295 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
297 } else if (startswith(word, "systemd.log_location=")) {
299 if (log_show_location_from_string(word + 21) < 0)
300 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
302 } else if (startswith(word, "systemd.dump_core=")) {
305 if ((r = parse_boolean(word + 18)) < 0)
306 log_warning("Failed to parse dump core switch %s. Ignoring.", word + 18);
310 } else if (startswith(word, "systemd.crash_shell=")) {
313 if ((r = parse_boolean(word + 20)) < 0)
314 log_warning("Failed to parse crash shell switch %s. Ignoring.", word + 20);
318 } else if (startswith(word, "systemd.confirm_spawn=")) {
321 if ((r = parse_boolean(word + 22)) < 0)
322 log_warning("Failed to parse confirm spawn switch %s. Ignoring.", word + 22);
324 arg_confirm_spawn = r;
326 } else if (startswith(word, "systemd.crash_chvt=")) {
329 if (safe_atoi(word + 19, &k) < 0)
330 log_warning("Failed to parse crash chvt switch %s. Ignoring.", word + 19);
334 } else if (startswith(word, "systemd.show_status=")) {
337 if ((r = parse_boolean(word + 20)) < 0)
338 log_warning("Failed to parse show status switch %s. Ignoring.", word + 20);
341 } else if (startswith(word, "systemd.default_standard_output=")) {
344 if ((r = exec_output_from_string(word + 32)) < 0)
345 log_warning("Failed to parse default standard output switch %s. Ignoring.", word + 32);
347 arg_default_std_output = r;
348 } else if (startswith(word, "systemd.default_standard_error=")) {
351 if ((r = exec_output_from_string(word + 31)) < 0)
352 log_warning("Failed to parse default standard error switch %s. Ignoring.", word + 31);
354 arg_default_std_error = r;
355 } else if (startswith(word, "systemd.setenv=")) {
356 _cleanup_free_ char *cenv = NULL;
360 cenv = strdup(word + 15);
364 eq = strchr(cenv, '=');
366 if (!env_name_is_valid(cenv))
367 log_warning("Environment variable name '%s' is not valid. Ignoring.", cenv);
371 log_warning("Unsetting environment variable '%s' failed, ignoring: %m", cenv);
374 if (!env_assignment_is_valid(cenv))
375 log_warning("Environment variable assignment '%s' is not valid. Ignoring.", cenv);
378 r = setenv(cenv, eq + 1, 1);
380 log_warning("Setting environment variable '%s=%s' failed, ignoring: %m", cenv, eq + 1);
384 } else if (startswith(word, "systemd.") ||
385 (in_initrd() && startswith(word, "rd.systemd."))) {
389 /* Ignore systemd.journald.xyz and friends */
391 if (startswith(c, "rd."))
393 if (startswith(c, "systemd."))
395 if (c[strcspn(c, ".=")] != '.') {
397 log_warning("Unknown kernel switch %s. Ignoring.", word);
399 log_info("Supported kernel switches:\n"
400 "systemd.unit=UNIT Default unit to start\n"
401 "rd.systemd.unit=UNIT Default unit to start when run in initrd\n"
402 "systemd.dump_core=0|1 Dump core on crash\n"
403 "systemd.crash_shell=0|1 Run shell on crash\n"
404 "systemd.crash_chvt=N Change to VT #N on crash\n"
405 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
406 "systemd.show_status=0|1 Show status updates on the console during bootup\n"
407 "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n"
409 "systemd.log_level=LEVEL Log level\n"
410 "systemd.log_color=0|1 Highlight important log messages\n"
411 "systemd.log_location=0|1 Include code location in log messages\n"
412 "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
413 " Set default log output for services\n"
414 "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
415 " Set default log error output for services\n"
416 "systemd.setenv=ASSIGNMENT Set an environment variable for all spawned processes\n");
419 } else if (streq(word, "quiet"))
420 arg_show_status = false;
421 else if (!in_initrd()) {
424 /* SysV compatibility */
425 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
426 if (streq(word, rlmap[i]))
427 return set_default_unit(rlmap[i+1]);
433 static int config_parse_level2(
434 const char *filename,
447 log_set_max_level_from_string(rvalue);
451 static int config_parse_target(
452 const char *filename,
465 log_set_target_from_string(rvalue);
469 static int config_parse_color(
470 const char *filename,
483 log_show_color_from_string(rvalue);
487 static int config_parse_location(
488 const char *filename,
501 log_show_location_from_string(rvalue);
505 static int config_parse_cpu_affinity2(
506 const char *filename,
525 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
530 if (!(t = strndup(w, l)))
533 r = safe_atou(t, &cpu);
537 if (!(c = cpu_set_malloc(&ncpus)))
540 if (r < 0 || cpu >= ncpus) {
541 log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
546 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
550 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
551 log_warning("Failed to set CPU affinity: %m");
559 static void strv_free_free(char ***l) {
571 static void free_join_controllers(void) {
572 if (!arg_join_controllers)
575 strv_free_free(arg_join_controllers);
576 arg_join_controllers = NULL;
579 static int config_parse_join_controllers(
580 const char *filename,
597 free_join_controllers();
599 FOREACH_WORD_QUOTED(w, length, rvalue, state) {
602 s = strndup(w, length);
606 l = strv_split(s, ",");
611 if (strv_length(l) <= 1) {
616 if (!arg_join_controllers) {
617 arg_join_controllers = new(char**, 2);
618 if (!arg_join_controllers) {
623 arg_join_controllers[0] = l;
624 arg_join_controllers[1] = NULL;
631 t = new0(char**, n+2);
639 for (a = arg_join_controllers; *a; a++) {
641 if (strv_overlap(*a, l)) {
644 c = strv_merge(*a, l);
667 t[n++] = strv_uniq(l);
669 strv_free_free(arg_join_controllers);
670 arg_join_controllers = t;
677 static int parse_config_file(void) {
679 const ConfigTableItem items[] = {
680 { "Manager", "LogLevel", config_parse_level2, 0, NULL },
681 { "Manager", "LogTarget", config_parse_target, 0, NULL },
682 { "Manager", "LogColor", config_parse_color, 0, NULL },
683 { "Manager", "LogLocation", config_parse_location, 0, NULL },
684 { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core },
685 { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell },
686 { "Manager", "ShowStatus", config_parse_bool, 0, &arg_show_status },
687 { "Manager", "CrashChVT", config_parse_int, 0, &arg_crash_chvt },
688 { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL },
689 { "Manager", "DefaultControllers", config_parse_strv, 0, &arg_default_controllers },
690 { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output },
691 { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error },
692 { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers },
693 { "Manager", "RuntimeWatchdogSec", config_parse_usec, 0, &arg_runtime_watchdog },
694 { "Manager", "ShutdownWatchdogSec", config_parse_usec, 0, &arg_shutdown_watchdog },
695 { "Manager", "CapabilityBoundingSet", config_parse_bounding_set, 0, &arg_capability_bounding_set_drop },
696 { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec },
697 { "Manager", "DefaultLimitCPU", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CPU]},
698 { "Manager", "DefaultLimitFSIZE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_FSIZE]},
699 { "Manager", "DefaultLimitDATA", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_DATA]},
700 { "Manager", "DefaultLimitSTACK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_STACK]},
701 { "Manager", "DefaultLimitCORE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_CORE]},
702 { "Manager", "DefaultLimitRSS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RSS]},
703 { "Manager", "DefaultLimitNOFILE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NOFILE]},
704 { "Manager", "DefaultLimitAS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_AS]},
705 { "Manager", "DefaultLimitNPROC", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NPROC]},
706 { "Manager", "DefaultLimitMEMLOCK", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MEMLOCK]},
707 { "Manager", "DefaultLimitLOCKS", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_LOCKS]},
708 { "Manager", "DefaultLimitSIGPENDING",config_parse_limit, 0, &arg_default_rlimit[RLIMIT_SIGPENDING]},
709 { "Manager", "DefaultLimitMSGQUEUE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_MSGQUEUE]},
710 { "Manager", "DefaultLimitNICE", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_NICE]},
711 { "Manager", "DefaultLimitRTPRIO", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTPRIO]},
712 { "Manager", "DefaultLimitRTTIME", config_parse_limit, 0, &arg_default_rlimit[RLIMIT_RTTIME]},
713 { NULL, NULL, NULL, 0, NULL }
720 fn = arg_running_as == SYSTEMD_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
726 log_warning("Failed to open configuration file '%s': %m", fn);
730 r = config_parse(fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, NULL);
732 log_warning("Failed to parse configuration file: %s", strerror(-r));
739 static int parse_proc_cmdline(void) {
740 char *line, *w, *state;
744 /* Don't read /proc/cmdline if we are in a container, since
745 * that is only relevant for the host system */
746 if (detect_container(NULL) > 0)
749 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
750 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
754 FOREACH_WORD_QUOTED(w, l, line, state) {
757 if (!(word = strndup(w, l))) {
762 r = parse_proc_cmdline_word(word);
764 log_error("Failed on cmdline argument %s: %s", word, strerror(-r));
779 static int parse_argv(int argc, char *argv[]) {
782 ARG_LOG_LEVEL = 0x100,
791 ARG_DUMP_CONFIGURATION_ITEMS,
799 ARG_DEFAULT_STD_OUTPUT,
800 ARG_DEFAULT_STD_ERROR
803 static const struct option options[] = {
804 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
805 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
806 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
807 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
808 { "unit", required_argument, NULL, ARG_UNIT },
809 { "system", no_argument, NULL, ARG_SYSTEM },
810 { "user", no_argument, NULL, ARG_USER },
811 { "test", no_argument, NULL, ARG_TEST },
812 { "help", no_argument, NULL, 'h' },
813 { "version", no_argument, NULL, ARG_VERSION },
814 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
815 { "dump-core", optional_argument, NULL, ARG_DUMP_CORE },
816 { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL },
817 { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN },
818 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
819 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
820 { "switched-root", no_argument, NULL, ARG_SWITCHED_ROOT },
821 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
822 { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },
823 { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },
835 while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
840 if ((r = log_set_max_level_from_string(optarg)) < 0) {
841 log_error("Failed to parse log level %s.", optarg);
849 if ((r = log_set_target_from_string(optarg)) < 0) {
850 log_error("Failed to parse log target %s.", optarg);
859 if ((r = log_show_color_from_string(optarg)) < 0) {
860 log_error("Failed to parse log color setting %s.", optarg);
864 log_show_color(true);
868 case ARG_LOG_LOCATION:
871 if ((r = log_show_location_from_string(optarg)) < 0) {
872 log_error("Failed to parse log location setting %s.", optarg);
876 log_show_location(true);
880 case ARG_DEFAULT_STD_OUTPUT:
882 if ((r = exec_output_from_string(optarg)) < 0) {
883 log_error("Failed to parse default standard output setting %s.", optarg);
886 arg_default_std_output = r;
889 case ARG_DEFAULT_STD_ERROR:
891 if ((r = exec_output_from_string(optarg)) < 0) {
892 log_error("Failed to parse default standard error output setting %s.", optarg);
895 arg_default_std_error = r;
900 if ((r = set_default_unit(optarg)) < 0) {
901 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
908 arg_running_as = SYSTEMD_SYSTEM;
912 arg_running_as = SYSTEMD_USER;
916 arg_action = ACTION_TEST;
920 arg_action = ACTION_VERSION;
923 case ARG_DUMP_CONFIGURATION_ITEMS:
924 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
928 r = optarg ? parse_boolean(optarg) : 1;
930 log_error("Failed to parse dump core boolean %s.", optarg);
936 case ARG_CRASH_SHELL:
937 r = optarg ? parse_boolean(optarg) : 1;
939 log_error("Failed to parse crash shell boolean %s.", optarg);
945 case ARG_CONFIRM_SPAWN:
946 r = optarg ? parse_boolean(optarg) : 1;
948 log_error("Failed to parse confirm spawn boolean %s.", optarg);
951 arg_confirm_spawn = r;
954 case ARG_SHOW_STATUS:
955 r = optarg ? parse_boolean(optarg) : 1;
957 log_error("Failed to parse show status boolean %s.", optarg);
963 case ARG_DESERIALIZE: {
967 r = safe_atoi(optarg, &fd);
968 if (r < 0 || fd < 0) {
969 log_error("Failed to parse deserialize option %s.", optarg);
970 return r < 0 ? r : -EINVAL;
973 fd_cloexec(fd, true);
977 log_error("Failed to open serialization fd: %m");
982 fclose(serialization);
989 case ARG_SWITCHED_ROOT:
990 arg_switched_root = true;
993 case ARG_INTROSPECT: {
994 const char * const * i = NULL;
996 for (i = bus_interface_table; *i; i += 2)
997 if (!optarg || streq(i[0], optarg)) {
998 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
1000 fputs(i[1], stdout);
1001 fputs("</node>\n", stdout);
1007 if (!i[0] && optarg)
1008 log_error("Unknown interface %s.", optarg);
1010 arg_action = ACTION_DONE;
1015 arg_action = ACTION_HELP;
1019 log_set_max_level(LOG_DEBUG);
1025 /* Just to eat away the sysvinit kernel
1026 * cmdline args without getopt() error
1027 * messages that we'll parse in
1028 * parse_proc_cmdline_word() or ignore. */
1032 if (getpid() != 1) {
1033 log_error("Unknown option code %c", c);
1040 if (optind < argc && getpid() != 1) {
1041 /* Hmm, when we aren't run as init system
1042 * let's complain about excess arguments */
1044 log_error("Excess arguments.");
1048 if (detect_container(NULL) > 0) {
1051 /* All /proc/cmdline arguments the kernel didn't
1052 * understand it passed to us. We're not really
1053 * interested in that usually since /proc/cmdline is
1054 * more interesting and complete. With one exception:
1055 * if we are run in a container /proc/cmdline is not
1056 * relevant for the container, hence we rely on argv[]
1059 for (a = argv; a < argv + argc; a++)
1060 if ((r = parse_proc_cmdline_word(*a)) < 0) {
1061 log_error("Failed on cmdline argument %s: %s", *a, strerror(-r));
1069 static int help(void) {
1071 printf("%s [OPTIONS...]\n\n"
1072 "Starts up and maintains the system or user services.\n\n"
1073 " -h --help Show this help\n"
1074 " --test Determine startup sequence, dump it and exit\n"
1075 " --dump-configuration-items Dump understood unit configuration items\n"
1076 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
1077 " --unit=UNIT Set default unit\n"
1078 " --system Run a system instance, even if PID != 1\n"
1079 " --user Run a user instance\n"
1080 " --dump-core[=0|1] Dump core on crash\n"
1081 " --crash-shell[=0|1] Run shell on crash\n"
1082 " --confirm-spawn[=0|1] Ask for confirmation when spawning processes\n"
1083 " --show-status[=0|1] Show status updates on the console during bootup\n"
1084 " --log-target=TARGET Set log target (console, journal, syslog, kmsg, journal-or-kmsg, syslog-or-kmsg, null)\n"
1085 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
1086 " --log-color[=0|1] Highlight important log messages\n"
1087 " --log-location[=0|1] Include code location in log messages\n"
1088 " --default-standard-output= Set default standard output for services\n"
1089 " --default-standard-error= Set default standard error output for services\n",
1090 program_invocation_short_name);
1095 static int version(void) {
1096 puts(PACKAGE_STRING);
1097 puts(SYSTEMD_FEATURES);
1102 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds, bool serialize_jobs) {
1111 /* Make sure nothing is really destructed when we shut down */
1114 r = manager_open_serialization(m, &f);
1116 log_error("Failed to create serialization file: %s", strerror(-r));
1123 log_error("Failed to allocate fd set: %s", strerror(-r));
1127 r = manager_serialize(m, f, fds, serialize_jobs);
1129 log_error("Failed to serialize state: %s", strerror(-r));
1133 if (fseeko(f, 0, SEEK_SET) < 0) {
1134 log_error("Failed to rewind serialization fd: %m");
1138 r = fd_cloexec(fileno(f), false);
1140 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
1144 r = fdset_cloexec(fds, false);
1146 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
1164 static int bump_rlimit_nofile(struct rlimit *saved_rlimit) {
1168 assert(saved_rlimit);
1170 /* Save the original RLIMIT_NOFILE so that we can reset it
1171 * later when transitioning from the initrd to the main
1172 * systemd or suchlike. */
1173 if (getrlimit(RLIMIT_NOFILE, saved_rlimit) < 0) {
1174 log_error("Reading RLIMIT_NOFILE failed: %m");
1178 /* Make sure forked processes get the default kernel setting */
1179 if (!arg_default_rlimit[RLIMIT_NOFILE]) {
1182 rl = newdup(struct rlimit, saved_rlimit, 1);
1186 arg_default_rlimit[RLIMIT_NOFILE] = rl;
1189 /* Bump up the resource limit for ourselves substantially */
1190 nl.rlim_cur = nl.rlim_max = 64*1024;
1191 r = setrlimit_closest(RLIMIT_NOFILE, &nl);
1193 log_error("Setting RLIMIT_NOFILE failed: %s", strerror(-r));
1200 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
1202 unsigned long long a, b;
1206 e = getenv("RD_TIMESTAMP");
1210 if (sscanf(e, "%llu %llu", &a, &b) != 2)
1213 t->realtime = (usec_t) a;
1214 t->monotonic = (usec_t) b;
1219 static void test_mtab(void) {
1222 /* Check that /etc/mtab is a symlink */
1224 if (readlink_malloc("/etc/mtab", &p) >= 0) {
1227 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
1234 log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
1235 "This is not supported anymore. "
1236 "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
1239 static void test_usr(void) {
1241 /* Check that /usr is not a separate fs */
1243 if (dir_is_empty("/usr") <= 0)
1246 log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. "
1247 "Some things will probably break (sometimes even silently) in mysterious ways. "
1248 "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1251 static void test_cgroups(void) {
1253 if (access("/proc/cgroups", F_OK) >= 0)
1256 log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. "
1257 "Systems without control groups are not supported. "
1258 "We will now sleep for 10s, and then continue boot-up. "
1259 "Expect breakage and please do not file bugs. "
1260 "Instead fix your kernel and enable CONFIG_CGROUPS. "
1261 "Consult http://0pointer.de/blog/projects/cgroups-vs-cgroups.html for more information.");
1266 static int initialize_join_controllers(void) {
1267 /* By default, mount "cpu" + "cpuacct" together, and "net_cls"
1268 * + "net_prio". We'd like to add "cpuset" to the mix, but
1269 * "cpuset" does't really work for groups with no initialized
1272 arg_join_controllers = new(char**, 3);
1273 if (!arg_join_controllers)
1276 arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL);
1277 if (!arg_join_controllers[0])
1280 arg_join_controllers[1] = strv_new("net_cls", "net_prio", NULL);
1281 if (!arg_join_controllers[1])
1284 arg_join_controllers[2] = NULL;
1288 int main(int argc, char *argv[]) {
1290 int r, retval = EXIT_FAILURE;
1291 usec_t before_startup, after_startup;
1292 char timespan[FORMAT_TIMESPAN_MAX];
1294 bool reexecute = false;
1295 const char *shutdown_verb = NULL;
1296 dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
1297 static char systemd[] = "systemd";
1298 bool skip_setup = false;
1300 bool loaded_policy = false;
1301 bool arm_reboot_watchdog = false;
1302 bool queue_default_job = false;
1303 char *switch_root_dir = NULL, *switch_root_init = NULL;
1304 static struct rlimit saved_rlimit_nofile = { 0, 0 };
1306 #ifdef HAVE_SYSV_COMPAT
1307 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
1308 /* This is compatibility support for SysV, where
1309 * calling init as a user is identical to telinit. */
1312 execv(SYSTEMCTL_BINARY_PATH, argv);
1313 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1318 /* Determine if this is a reexecution or normal bootup. We do
1319 * the full command line parsing much later, so let's just
1320 * have a quick peek here. */
1321 if (strv_find(argv+1, "--deserialize"))
1324 /* If we have switched root, do all the special setup
1326 if (strv_find(argv+1, "--switched-root"))
1329 /* If we get started via the /sbin/init symlink then we are
1330 called 'init'. After a subsequent reexecution we are then
1331 called 'systemd'. That is confusing, hence let's call us
1332 systemd right-away. */
1333 program_invocation_short_name = systemd;
1334 prctl(PR_SET_NAME, systemd);
1339 log_show_color(isatty(STDERR_FILENO) > 0);
1341 if (getpid() == 1 && detect_container(NULL) <= 0) {
1343 /* Running outside of a container as PID 1 */
1344 arg_running_as = SYSTEMD_SYSTEM;
1346 log_set_target(LOG_TARGET_KMSG);
1350 char *rd_timestamp = NULL;
1352 dual_timestamp_get(&initrd_timestamp);
1353 asprintf(&rd_timestamp, "%llu %llu",
1354 (unsigned long long) initrd_timestamp.realtime,
1355 (unsigned long long) initrd_timestamp.monotonic);
1357 setenv("RD_TIMESTAMP", rd_timestamp, 1);
1363 mount_setup_early();
1364 if (selinux_setup(&loaded_policy) < 0)
1366 if (ima_setup() < 0)
1368 if (smack_setup() < 0)
1372 if (label_init(NULL) < 0)
1376 if (hwclock_is_localtime() > 0) {
1379 /* The first-time call to settimeofday() does a time warp in the kernel */
1380 r = hwclock_set_timezone(&min);
1382 log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
1384 log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1385 } else if (!in_initrd()) {
1387 * Do dummy first-time call to seal the kernel's time warp magic
1389 * Do not call this this from inside the initrd. The initrd might not
1390 * carry /etc/adjtime with LOCAL, but the real system could be set up
1391 * that way. In such case, we need to delay the time-warp or the sealing
1392 * until we reach the real system.
1394 hwclock_reset_timezone();
1396 /* Tell the kernel our time zone */
1397 r = hwclock_set_timezone(NULL);
1399 log_error("Failed to set the kernel's time zone, ignoring: %s", strerror(-r));
1403 /* Set the default for later on, but don't actually
1404 * open the logs like this for now. Note that if we
1405 * are transitioning from the initrd there might still
1406 * be journal fd open, and we shouldn't attempt
1407 * opening that before we parsed /proc/cmdline which
1408 * might redirect output elsewhere. */
1409 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
1411 } else if (getpid() == 1) {
1413 /* Running inside a container, as PID 1 */
1414 arg_running_as = SYSTEMD_SYSTEM;
1415 log_set_target(LOG_TARGET_CONSOLE);
1418 /* For the later on, see above... */
1419 log_set_target(LOG_TARGET_JOURNAL);
1423 /* Running as user instance */
1424 arg_running_as = SYSTEMD_USER;
1425 log_set_target(LOG_TARGET_AUTO);
1429 /* Initialize default unit */
1430 r = set_default_unit(SPECIAL_DEFAULT_TARGET);
1432 log_error("Failed to set default unit %s: %s", SPECIAL_DEFAULT_TARGET, strerror(-r));
1436 r = initialize_join_controllers();
1440 /* Mount /proc, /sys and friends, so that /proc/cmdline and
1441 * /proc/$PID/fd is available. */
1442 if (getpid() == 1) {
1443 r = mount_setup(loaded_policy);
1448 /* Reset all signal handlers. */
1449 assert_se(reset_all_signal_handlers() == 0);
1451 /* If we are init, we can block sigkill. Yay. */
1452 ignore_signals(SIGNALS_IGNORE, -1);
1454 if (parse_config_file() < 0)
1457 if (arg_running_as == SYSTEMD_SYSTEM)
1458 if (parse_proc_cmdline() < 0)
1461 log_parse_environment();
1463 if (parse_argv(argc, argv) < 0)
1466 if (arg_action == ACTION_TEST &&
1468 log_error("Don't run test mode as root.");
1472 if (arg_running_as == SYSTEMD_USER &&
1473 arg_action == ACTION_RUN &&
1475 log_error("Trying to run as user instance, but the system has not been booted with systemd.");
1479 if (arg_running_as == SYSTEMD_SYSTEM &&
1480 arg_action == ACTION_RUN &&
1481 running_in_chroot() > 0) {
1482 log_error("Cannot be run in a chroot() environment.");
1486 if (arg_action == ACTION_HELP) {
1489 } else if (arg_action == ACTION_VERSION) {
1492 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1493 unit_dump_config_items(stdout);
1494 retval = EXIT_SUCCESS;
1496 } else if (arg_action == ACTION_DONE) {
1497 retval = EXIT_SUCCESS;
1501 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1503 /* Close logging fds, in order not to confuse fdset below */
1506 /* Remember open file descriptors for later deserialization */
1507 r = fdset_new_fill(&fds);
1509 log_error("Failed to allocate fd set: %s", strerror(-r));
1512 fdset_cloexec(fds, true);
1515 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1517 /* Set up PATH unless it is already set */
1519 #ifdef HAVE_SPLIT_USR
1520 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1522 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin",
1524 arg_running_as == SYSTEMD_SYSTEM);
1526 if (arg_running_as == SYSTEMD_SYSTEM) {
1527 /* Parse the data passed to us. We leave this
1528 * variables set, but the manager later on will not
1529 * pass them on to our children. */
1531 parse_initrd_timestamp(&initrd_timestamp);
1533 /* Unset some environment variables passed in from the
1534 * kernel that don't really make sense for us. */
1538 /* When we are invoked by a shell, these might be set,
1539 * but make little sense to pass on */
1544 /* When we are invoked by a chroot-like tool such as
1545 * nspawn, these might be set, but make little sense
1548 unsetenv("LOGNAME");
1550 /* We suppress the socket activation env vars, as
1551 * we'll try to match *any* open fd to units if
1553 unsetenv("LISTEN_FDS");
1554 unsetenv("LISTEN_PID");
1556 /* All other variables are left as is, so that clients
1557 * can still read them via /proc/1/environ */
1560 /* Move out of the way, so that we won't block unmounts */
1561 assert_se(chdir("/") == 0);
1563 if (arg_running_as == SYSTEMD_SYSTEM) {
1564 /* Become a session leader if we aren't one yet. */
1567 /* Disable the umask logic */
1571 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1572 dbus_connection_set_change_sigpipe(FALSE);
1574 /* Reset the console, but only if this is really init and we
1575 * are freshly booted */
1576 if (arg_running_as == SYSTEMD_SYSTEM && arg_action == ACTION_RUN)
1577 console_setup(getpid() == 1 && !skip_setup);
1579 /* Open the logging devices, if possible and necessary */
1582 /* Make sure we leave a core dump without panicing the
1584 if (getpid() == 1) {
1585 install_crash_handler();
1587 r = mount_cgroup_controllers(arg_join_controllers);
1592 if (arg_running_as == SYSTEMD_SYSTEM) {
1593 const char *virtualization = NULL;
1595 log_info(PACKAGE_STRING " running in system mode. (" SYSTEMD_FEATURES ")");
1597 detect_virtualization(&virtualization);
1599 log_info("Detected virtualization '%s'.", virtualization);
1602 log_info("Running in initial RAM disk.");
1605 log_debug(PACKAGE_STRING " running in user mode. (" SYSTEMD_FEATURES ")");
1607 if (arg_running_as == SYSTEMD_SYSTEM && !skip_setup) {
1610 if (arg_show_status || plymouth_running())
1625 if (arg_running_as == SYSTEMD_SYSTEM && arg_runtime_watchdog > 0)
1626 watchdog_set_timeout(&arg_runtime_watchdog);
1628 if (arg_timer_slack_nsec != (nsec_t) -1)
1629 if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0)
1630 log_error("Failed to adjust timer slack: %m");
1632 if (arg_capability_bounding_set_drop) {
1633 r = capability_bounding_set_drop(arg_capability_bounding_set_drop, true);
1635 log_error("Failed to drop capability bounding set: %s", strerror(-r));
1638 r = capability_bounding_set_drop_usermode(arg_capability_bounding_set_drop);
1640 log_error("Failed to drop capability bounding set of usermode helpers: %s", strerror(-r));
1645 if (arg_running_as == SYSTEMD_USER) {
1646 /* Become reaper of our children */
1647 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) {
1648 log_warning("Failed to make us a subreaper: %m");
1649 if (errno == EINVAL)
1650 log_info("Perhaps the kernel version is too old (< 3.4?)");
1654 if (arg_running_as == SYSTEMD_SYSTEM)
1655 bump_rlimit_nofile(&saved_rlimit_nofile);
1657 r = manager_new(arg_running_as, &m);
1659 log_error("Failed to allocate manager object: %s", strerror(-r));
1663 m->confirm_spawn = arg_confirm_spawn;
1664 m->default_std_output = arg_default_std_output;
1665 m->default_std_error = arg_default_std_error;
1666 m->runtime_watchdog = arg_runtime_watchdog;
1667 m->shutdown_watchdog = arg_shutdown_watchdog;
1669 manager_set_default_rlimits(m, arg_default_rlimit);
1671 if (dual_timestamp_is_set(&initrd_timestamp))
1672 m->initrd_timestamp = initrd_timestamp;
1674 if (arg_default_controllers)
1675 manager_set_default_controllers(m, arg_default_controllers);
1677 manager_set_show_status(m, arg_show_status);
1679 /* Remember whether we should queue the default job */
1680 queue_default_job = !serialization || arg_switched_root;
1682 before_startup = now(CLOCK_MONOTONIC);
1684 r = manager_startup(m, serialization, fds);
1686 log_error("Failed to fully start up daemon: %s", strerror(-r));
1688 /* This will close all file descriptors that were opened, but
1689 * not claimed by any unit. */
1692 if (serialization) {
1693 fclose(serialization);
1694 serialization = NULL;
1697 if (queue_default_job) {
1699 Unit *target = NULL;
1700 Job *default_unit_job;
1702 dbus_error_init(&error);
1704 log_debug("Activating default unit: %s", arg_default_unit);
1706 r = manager_load_unit(m, arg_default_unit, NULL, &error, &target);
1708 log_error("Failed to load default target: %s", bus_error(&error, r));
1709 dbus_error_free(&error);
1710 } else if (target->load_state == UNIT_ERROR)
1711 log_error("Failed to load default target: %s", strerror(-target->load_error));
1712 else if (target->load_state == UNIT_MASKED)
1713 log_error("Default target masked.");
1715 if (!target || target->load_state != UNIT_LOADED) {
1716 log_info("Trying to load rescue target...");
1718 r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target);
1720 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1721 dbus_error_free(&error);
1723 } else if (target->load_state == UNIT_ERROR) {
1724 log_error("Failed to load rescue target: %s", strerror(-target->load_error));
1726 } else if (target->load_state == UNIT_MASKED) {
1727 log_error("Rescue target masked.");
1732 assert(target->load_state == UNIT_LOADED);
1734 if (arg_action == ACTION_TEST) {
1735 printf("-> By units:\n");
1736 manager_dump_units(m, stdout, "\t");
1739 r = manager_add_job(m, JOB_START, target, JOB_ISOLATE, false, &error, &default_unit_job);
1741 log_error("Default target could not be isolated, starting instead: %s", bus_error(&error, r));
1742 dbus_error_free(&error);
1744 r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &default_unit_job);
1746 log_error("Failed to start default target: %s", bus_error(&error, r));
1747 dbus_error_free(&error);
1751 log_error("Failed to isolate default target: %s", bus_error(&error, r));
1752 dbus_error_free(&error);
1756 m->default_unit_job_id = default_unit_job->id;
1758 after_startup = now(CLOCK_MONOTONIC);
1759 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
1760 "Loaded units and determined initial transaction in %s.",
1761 format_timespan(timespan, sizeof(timespan), after_startup - before_startup));
1763 if (arg_action == ACTION_TEST) {
1764 printf("-> By jobs:\n");
1765 manager_dump_jobs(m, stdout, "\t");
1766 retval = EXIT_SUCCESS;
1772 r = manager_loop(m);
1774 log_error("Failed to run mainloop: %s", strerror(-r));
1778 switch (m->exit_code) {
1781 retval = EXIT_SUCCESS;
1785 case MANAGER_RELOAD:
1786 log_info("Reloading.");
1787 r = manager_reload(m);
1789 log_error("Failed to reload: %s", strerror(-r));
1792 case MANAGER_REEXECUTE:
1794 if (prepare_reexecute(m, &serialization, &fds, true) < 0)
1798 log_notice("Reexecuting.");
1801 case MANAGER_SWITCH_ROOT:
1802 /* Steal the switch root parameters */
1803 switch_root_dir = m->switch_root;
1804 switch_root_init = m->switch_root_init;
1805 m->switch_root = m->switch_root_init = NULL;
1807 if (!switch_root_init)
1808 if (prepare_reexecute(m, &serialization, &fds, false) < 0)
1812 log_notice("Switching root.");
1815 case MANAGER_REBOOT:
1816 case MANAGER_POWEROFF:
1818 case MANAGER_KEXEC: {
1819 static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1820 [MANAGER_REBOOT] = "reboot",
1821 [MANAGER_POWEROFF] = "poweroff",
1822 [MANAGER_HALT] = "halt",
1823 [MANAGER_KEXEC] = "kexec"
1826 assert_se(shutdown_verb = table[m->exit_code]);
1827 arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT;
1829 log_notice("Shutting down.");
1834 assert_not_reached("Unknown exit code.");
1842 for (j = 0; j < RLIMIT_NLIMITS; j++)
1843 free(arg_default_rlimit[j]);
1845 free(arg_default_unit);
1846 strv_free(arg_default_controllers);
1847 free_join_controllers();
1854 unsigned i, args_size;
1856 /* Close and disarm the watchdog, so that the new
1857 * instance can reinitialize it, but doesn't get
1858 * rebooted while we do that */
1859 watchdog_close(true);
1861 /* Reset the RLIMIT_NOFILE to the kernel default, so
1862 * that the new systemd can pass the kernel default to
1863 * its child processes */
1864 if (saved_rlimit_nofile.rlim_cur > 0)
1865 setrlimit(RLIMIT_NOFILE, &saved_rlimit_nofile);
1867 if (switch_root_dir) {
1868 /* Kill all remaining processes from the
1869 * initrd, but don't wait for them, so that we
1870 * can handle the SIGCHLD for them after
1872 broadcast_signal(SIGTERM, false);
1874 /* And switch root */
1875 r = switch_root(switch_root_dir);
1877 log_error("Failed to switch root, ignoring: %s", strerror(-r));
1880 args_size = MAX(6, argc+1);
1881 args = newa(const char*, args_size);
1883 if (!switch_root_init) {
1886 /* First try to spawn ourselves with the right
1887 * path, and with full serialization. We do
1888 * this only if the user didn't specify an
1889 * explicit init to spawn. */
1891 assert(serialization);
1894 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1898 args[i++] = SYSTEMD_BINARY_PATH;
1899 if (switch_root_dir)
1900 args[i++] = "--switched-root";
1901 args[i++] = arg_running_as == SYSTEMD_SYSTEM ? "--system" : "--user";
1902 args[i++] = "--deserialize";
1906 assert(i <= args_size);
1907 execv(args[0], (char* const*) args);
1910 /* Try the fallback, if there is any, without any
1911 * serialization. We pass the original argv[] and
1912 * envp[]. (Well, modulo the ordering changes due to
1913 * getopt() in argv[], and some cleanups in envp[],
1914 * but let's hope that doesn't matter.) */
1916 if (serialization) {
1917 fclose(serialization);
1918 serialization = NULL;
1926 /* Reopen the console */
1927 make_console_stdio();
1929 for (j = 1, i = 1; j < argc; j++)
1930 args[i++] = argv[j];
1932 assert(i <= args_size);
1934 if (switch_root_init) {
1935 args[0] = switch_root_init;
1936 execv(args[0], (char* const*) args);
1937 log_warning("Failed to execute configured init, trying fallback: %m");
1940 args[0] = "/sbin/init";
1941 execv(args[0], (char* const*) args);
1943 if (errno == ENOENT) {
1944 log_warning("No /sbin/init, trying fallback");
1946 args[0] = "/bin/sh";
1948 execv(args[0], (char* const*) args);
1949 log_error("Failed to execute /bin/sh, giving up: %m");
1951 log_warning("Failed to execute /sbin/init, giving up: %m");
1955 fclose(serialization);
1960 if (shutdown_verb) {
1961 const char * command_line[] = {
1962 SYSTEMD_SHUTDOWN_BINARY_PATH,
1968 if (arm_reboot_watchdog && arg_shutdown_watchdog > 0) {
1971 /* If we reboot let's set the shutdown
1972 * watchdog and tell the shutdown binary to
1973 * repeatedly ping it */
1974 watchdog_set_timeout(&arg_shutdown_watchdog);
1975 watchdog_close(false);
1977 /* Tell the binary how often to ping */
1978 snprintf(e, sizeof(e), "WATCHDOG_USEC=%llu", (unsigned long long) arg_shutdown_watchdog);
1981 env_block = strv_append(environ, e);
1983 env_block = strv_copy(environ);
1984 watchdog_close(true);
1987 execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block);
1989 log_error("Failed to execute shutdown binary, freezing: %m");