1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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 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.
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.
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/>.
22 #include <dbus/dbus.h>
28 #include <sys/types.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"
45 #include "conf-parser.h"
46 #include "bus-errors.h"
52 ACTION_DUMP_CONFIGURATION_ITEMS,
54 } arg_action = ACTION_RUN;
56 static char *arg_default_unit = NULL;
57 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
59 static bool arg_dump_core = true;
60 static bool arg_crash_shell = false;
61 static int arg_crash_chvt = -1;
62 static bool arg_confirm_spawn = false;
63 static bool arg_nomodules = false;
64 static bool arg_show_status = true;
66 static FILE* serialization = NULL;
68 _noreturn_ static void freeze(void) {
73 static void nop_handler(int sig) {
76 _noreturn_ static void crash(int sig) {
79 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
84 /* We want to wait for the core process, hence let's enable SIGCHLD */
86 sa.sa_handler = nop_handler;
87 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
88 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
90 if ((pid = fork()) < 0)
91 log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
96 /* Enable default signal handler for core dump */
98 sa.sa_handler = SIG_DFL;
99 assert_se(sigaction(sig, &sa, NULL) == 0);
101 /* Don't limit the core dump size */
103 rl.rlim_cur = RLIM_INFINITY;
104 rl.rlim_max = RLIM_INFINITY;
105 setrlimit(RLIMIT_CORE, &rl);
107 /* Just to be sure... */
108 assert_se(chdir("/") == 0);
110 /* Raise the signal again */
113 assert_not_reached("We shouldn't be here...");
119 /* Order things nicely. */
120 if ((r = waitpid(pid, &status, 0)) < 0)
121 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(errno));
122 else if (!WCOREDUMP(status))
123 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
125 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
130 chvt(arg_crash_chvt);
132 if (arg_crash_shell) {
136 log_info("Executing crash shell in 10s...");
139 /* Let the kernel reap children for us */
141 sa.sa_handler = SIG_IGN;
142 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
143 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
145 if ((pid = fork()) < 0)
146 log_error("Failed to fork off crash shell: %s", strerror(errno));
150 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
151 log_error("Failed to acquire terminal: %s", strerror(-fd));
152 else if ((r = make_stdio(fd)) < 0)
153 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
155 execl("/bin/sh", "/bin/sh", NULL);
157 log_error("execl() failed: %s", strerror(errno));
161 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
164 log_info("Freezing execution.");
168 static void install_crash_handler(void) {
173 sa.sa_handler = crash;
174 sa.sa_flags = SA_NODEFER;
176 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
179 static int make_null_stdio(void) {
182 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
183 log_error("Failed to open /dev/null: %m");
187 if ((r = make_stdio(null_fd)) < 0)
188 log_warning("Failed to dup2() device: %s", strerror(-r));
193 static int console_setup(bool do_reset) {
196 /* If we are init, we connect stdin/stdout/stderr to /dev/null
197 * and make sure we don't have a controlling tty. */
204 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
205 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
209 if ((r = reset_terminal(tty_fd)) < 0)
210 log_error("Failed to reset /dev/console: %s", strerror(-r));
212 close_nointr_nofail(tty_fd);
216 static int set_default_unit(const char *u) {
221 if (!(c = strdup(u)))
224 free(arg_default_unit);
225 arg_default_unit = c;
229 static int parse_proc_cmdline_word(const char *word) {
231 static const char * const rlmap[] = {
232 "single", SPECIAL_RESCUE_TARGET,
233 "-s", SPECIAL_RESCUE_TARGET,
234 "s", SPECIAL_RESCUE_TARGET,
235 "S", SPECIAL_RESCUE_TARGET,
236 "1", SPECIAL_RESCUE_TARGET,
237 "2", SPECIAL_RUNLEVEL2_TARGET,
238 "3", SPECIAL_RUNLEVEL3_TARGET,
239 "4", SPECIAL_RUNLEVEL4_TARGET,
240 "5", SPECIAL_RUNLEVEL5_TARGET
242 bool ignore_quiet = false;
244 if (startswith(word, "systemd.unit="))
245 return set_default_unit(word + 13);
247 else if (startswith(word, "systemd.log_target=")) {
249 if (log_set_target_from_string(word + 19) < 0)
250 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
252 } else if (startswith(word, "systemd.log_level=")) {
254 if (log_set_max_level_from_string(word + 18) < 0)
255 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
257 } else if (startswith(word, "systemd.log_color=")) {
259 if (log_show_color_from_string(word + 18) < 0)
260 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
262 } else if (startswith(word, "systemd.log_location=")) {
264 if (log_show_location_from_string(word + 21) < 0)
265 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
267 } else if (startswith(word, "systemd.dump_core=")) {
270 if ((r = parse_boolean(word + 18)) < 0)
271 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
275 } else if (startswith(word, "systemd.crash_shell=")) {
278 if ((r = parse_boolean(word + 20)) < 0)
279 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
283 } else if (startswith(word, "systemd.confirm_spawn=")) {
286 if ((r = parse_boolean(word + 22)) < 0)
287 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
289 arg_confirm_spawn = r;
291 } else if (startswith(word, "systemd.crash_chvt=")) {
294 if (safe_atoi(word + 19, &k) < 0)
295 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
299 } else if (startswith(word, "systemd.show_status=")) {
302 if ((r = parse_boolean(word + 20)) < 0)
303 log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
309 } else if (startswith(word, "systemd.")) {
311 log_warning("Unknown kernel switch %s. Ignoring.", word);
313 log_info("Supported kernel switches:\n"
314 "systemd.unit=UNIT Default unit to start\n"
315 "systemd.log_target=console|kmsg|syslog| Log target\n"
316 " syslog-org-kmsg|null\n"
317 "systemd.log_level=LEVEL Log level\n"
318 "systemd.log_color=0|1 Highlight important log messages\n"
319 "systemd.log_location=0|1 Include code location in log messages\n"
320 "systemd.dump_core=0|1 Dump core on crash\n"
321 "systemd.crash_shell=0|1 Run shell on crash\n"
322 "systemd.crash_chvt=N Change to VT #N on crash\n"
323 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
324 "systemd.show_status=0|1 Show status updates on the console during bootup\n");
326 } else if (streq(word, "nomodules"))
327 arg_nomodules = true;
328 else if (streq(word, "quiet")) {
330 arg_show_status = false;
334 /* SysV compatibility */
335 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
336 if (streq(word, rlmap[i]))
337 return set_default_unit(rlmap[i+1]);
343 static int config_parse_level(
344 const char *filename,
356 log_set_max_level_from_string(rvalue);
360 static int config_parse_target(
361 const char *filename,
373 log_set_target_from_string(rvalue);
377 static int config_parse_color(
378 const char *filename,
390 log_show_color_from_string(rvalue);
394 static int config_parse_location(
395 const char *filename,
407 log_show_location_from_string(rvalue);
411 static int config_parse_cpu_affinity(
412 const char *filename,
430 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
435 if (!(t = strndup(w, l)))
438 r = safe_atou(t, &cpu);
442 if (!(c = cpu_set_malloc(&ncpus)))
445 if (r < 0 || cpu >= ncpus) {
446 log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
451 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
455 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
456 log_warning("Failed to set CPU affinity: %m");
464 static int parse_config_file(void) {
466 const ConfigItem items[] = {
467 { "LogLevel", config_parse_level, NULL, "Manager" },
468 { "LogTarget", config_parse_target, NULL, "Manager" },
469 { "LogColor", config_parse_color, NULL, "Manager" },
470 { "LogLocation", config_parse_location, NULL, "Manager" },
471 { "DumpCore", config_parse_bool, &arg_dump_core, "Manager" },
472 { "CrashShell", config_parse_bool, &arg_crash_shell, "Manager" },
473 { "ShowStatus", config_parse_bool, &arg_show_status, "Manager" },
474 { "CrashChVT", config_parse_int, &arg_crash_chvt, "Manager" },
475 { "CPUAffinity", config_parse_cpu_affinity, NULL, "Manager" },
476 { NULL, NULL, NULL, NULL }
479 static const char * const sections[] = {
488 fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
490 if (!(f = fopen(fn, "re"))) {
494 log_warning("Failed to open configuration file '%s': %m", fn);
498 if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
499 log_warning("Failed to parse configuration file: %s", strerror(-r));
506 static int parse_proc_cmdline(void) {
513 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
514 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
518 FOREACH_WORD_QUOTED(w, l, line, state) {
521 if (!(word = strndup(w, l))) {
526 r = parse_proc_cmdline_word(word);
540 static int parse_argv(int argc, char *argv[]) {
543 ARG_LOG_LEVEL = 0x100,
550 ARG_DUMP_CONFIGURATION_ITEMS,
559 static const struct option options[] = {
560 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
561 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
562 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
563 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
564 { "unit", required_argument, NULL, ARG_UNIT },
565 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
566 { "test", no_argument, NULL, ARG_TEST },
567 { "help", no_argument, NULL, 'h' },
568 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
569 { "dump-core", no_argument, NULL, ARG_DUMP_CORE },
570 { "crash-shell", no_argument, NULL, ARG_CRASH_SHELL },
571 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
572 { "show-status", no_argument, NULL, ARG_SHOW_STATUS },
573 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
574 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
583 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
588 if ((r = log_set_max_level_from_string(optarg)) < 0) {
589 log_error("Failed to parse log level %s.", optarg);
597 if ((r = log_set_target_from_string(optarg)) < 0) {
598 log_error("Failed to parse log target %s.", optarg);
607 if ((r = log_show_color_from_string(optarg)) < 0) {
608 log_error("Failed to parse log color setting %s.", optarg);
612 log_show_color(true);
616 case ARG_LOG_LOCATION:
619 if ((r = log_show_location_from_string(optarg)) < 0) {
620 log_error("Failed to parse log location setting %s.", optarg);
624 log_show_location(true);
630 if ((r = set_default_unit(optarg)) < 0) {
631 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
637 case ARG_RUNNING_AS: {
640 if ((as = manager_running_as_from_string(optarg)) < 0) {
641 log_error("Failed to parse running as value %s", optarg);
650 arg_action = ACTION_TEST;
653 case ARG_DUMP_CONFIGURATION_ITEMS:
654 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
658 arg_dump_core = true;
661 case ARG_CRASH_SHELL:
662 arg_crash_shell = true;
665 case ARG_CONFIRM_SPAWN:
666 arg_confirm_spawn = true;
669 case ARG_SHOW_STATUS:
670 arg_show_status = true;
673 case ARG_DESERIALIZE: {
677 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
678 log_error("Failed to parse deserialize option %s.", optarg);
682 if (!(f = fdopen(fd, "r"))) {
683 log_error("Failed to open serialization fd: %m");
688 fclose(serialization);
695 case ARG_INTROSPECT: {
696 const char * const * i = NULL;
698 for (i = bus_interface_table; *i; i += 2)
699 if (!optarg || streq(i[0], optarg)) {
700 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
703 fputs("</node>\n", stdout);
710 log_error("Unknown interface %s.", optarg);
712 arg_action = ACTION_DONE;
717 arg_action = ACTION_HELP;
724 log_error("Unknown option code %c", c);
728 /* PID 1 will get the kernel arguments as parameters, which we
729 * ignore and unconditionally read from
730 * /proc/cmdline. However, we need to ignore those arguments
732 if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
733 log_error("Excess arguments.");
740 static int help(void) {
742 printf("%s [OPTIONS...]\n\n"
743 "Starts up and maintains the system or a session.\n\n"
744 " -h --help Show this help\n"
745 " --test Determine startup sequence, dump it and exit\n"
746 " --dump-configuration-items Dump understood unit configuration items\n"
747 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
748 " --unit=UNIT Set default unit\n"
749 " --running-as=AS Set running as (system, session)\n"
750 " --dump-core Dump core on crash\n"
751 " --crash-shell Run shell on crash\n"
752 " --confirm-spawn Ask for confirmation when spawning processes\n"
753 " --show-status Show status updates on the console during bootup\n"
754 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
755 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
756 " --log-color[=0|1] Highlight important log messages\n"
757 " --log-location[=0|1] Include code location in log messages\n",
758 program_invocation_short_name);
763 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
772 if ((r = manager_open_serialization(&f)) < 0) {
773 log_error("Failed to create serialization faile: %s", strerror(-r));
777 if (!(fds = fdset_new())) {
779 log_error("Failed to allocate fd set: %s", strerror(-r));
783 if ((r = manager_serialize(m, f, fds)) < 0) {
784 log_error("Failed to serialize state: %s", strerror(-r));
788 if (fseeko(f, 0, SEEK_SET) < 0) {
789 log_error("Failed to rewind serialization fd: %m");
793 if ((r = fd_cloexec(fileno(f), false)) < 0) {
794 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
798 if ((r = fdset_cloexec(fds, false)) < 0) {
799 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
817 int main(int argc, char *argv[]) {
823 bool reexecute = false;
825 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
826 /* This is compatbility support for SysV, where
827 * calling init as a user is identical to telinit. */
830 execv(SYSTEMCTL_BINARY_PATH, argv);
831 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
835 log_show_color(true);
836 log_show_location(false);
837 log_set_max_level(LOG_INFO);
840 arg_running_as = MANAGER_SYSTEM;
841 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
843 arg_running_as = MANAGER_SESSION;
844 log_set_target(LOG_TARGET_CONSOLE);
847 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
850 /* Mount /proc, /sys and friends, so that /proc/cmdline and
851 * /proc/$PID/fd is available. */
852 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
853 if (mount_setup() < 0)
856 /* Reset all signal handlers. */
857 assert_se(reset_all_signal_handlers() == 0);
859 /* If we are init, we can block sigkill. Yay. */
860 ignore_signals(SIGNALS_IGNORE, -1);
862 if (parse_config_file() < 0)
865 if (arg_running_as == MANAGER_SYSTEM)
866 if (parse_proc_cmdline() < 0)
869 log_parse_environment();
871 if (parse_argv(argc, argv) < 0)
874 if (arg_action == ACTION_HELP) {
877 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
878 unit_dump_config_items(stdout);
881 } else if (arg_action == ACTION_DONE) {
886 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
888 /* Remember open file descriptors for later deserialization */
890 if ((r = fdset_new_fill(&fds)) < 0) {
891 log_error("Failed to allocate fd set: %s", strerror(-r));
895 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
897 close_all_fds(NULL, 0);
899 /* Set up PATH unless it is already set */
901 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
902 arg_running_as == MANAGER_SYSTEM);
904 /* Move out of the way, so that we won't block unmounts */
905 assert_se(chdir("/") == 0);
907 if (arg_running_as == MANAGER_SYSTEM) {
908 /* Become a session leader if we aren't one yet. */
911 /* Disable the umask logic */
915 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
916 dbus_connection_set_change_sigpipe(FALSE);
918 /* Reset the console, but only if this is really init and we
919 * are freshly booted */
920 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
921 console_setup(getpid() == 1 && !serialization);
925 /* Open the logging devices, if possible and necessary */
928 /* Make sure we leave a core dump without panicing the
931 install_crash_handler();
933 log_info(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
935 if (arg_running_as == MANAGER_SYSTEM && !serialization) {
938 modprobe_setup(arg_nomodules);
944 if ((r = manager_new(arg_running_as, &m)) < 0) {
945 log_error("Failed to allocate manager object: %s", strerror(-r));
949 m->confirm_spawn = arg_confirm_spawn;
950 m->show_status = arg_show_status;
952 if ((r = manager_startup(m, serialization, fds)) < 0)
953 log_error("Failed to fully start up daemon: %s", strerror(-r));
956 /* This will close all file descriptors that were opened, but
957 * not claimed by any unit. */
964 fclose(serialization);
965 serialization = NULL;
969 dbus_error_init(&error);
971 log_debug("Activating default unit: %s", arg_default_unit);
973 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
974 log_error("Failed to load default target: %s", bus_error(&error, r));
975 dbus_error_free(&error);
977 log_info("Trying to load rescue target...");
978 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
979 log_error("Failed to load rescue target: %s", bus_error(&error, r));
980 dbus_error_free(&error);
985 if (arg_action == ACTION_TEST) {
986 printf("-> By units:\n");
987 manager_dump_units(m, stdout, "\t");
990 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, &job)) < 0) {
991 log_error("Failed to start default target: %s", bus_error(&error, r));
992 dbus_error_free(&error);
996 if (arg_action == ACTION_TEST) {
997 printf("-> By jobs:\n");
998 manager_dump_jobs(m, stdout, "\t");
1005 if ((r = manager_loop(m)) < 0) {
1006 log_error("Failed to run mainloop: %s", strerror(-r));
1010 switch (m->exit_code) {
1017 case MANAGER_RELOAD:
1018 log_info("Reloading.");
1019 if ((r = manager_reload(m)) < 0)
1020 log_error("Failed to reload: %s", strerror(-r));
1023 case MANAGER_REEXECUTE:
1024 if (prepare_reexecute(m, &serialization, &fds) < 0)
1028 log_notice("Reexecuting.");
1032 assert_not_reached("Unknown exit code.");
1040 free(arg_default_unit);
1045 const char *args[11];
1049 assert(serialization);
1052 args[i++] = SYSTEMD_BINARY_PATH;
1054 args[i++] = "--log-level";
1055 args[i++] = log_level_to_string(log_get_max_level());
1057 args[i++] = "--log-target";
1058 args[i++] = log_target_to_string(log_get_target());
1060 args[i++] = "--running-as";
1061 args[i++] = manager_running_as_to_string(arg_running_as);
1063 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1066 args[i++] = "--deserialize";
1069 if (arg_confirm_spawn)
1070 args[i++] = "--confirm-spawn";
1074 assert(i <= ELEMENTSOF(args));
1076 execv(args[0], (char* const*) args);
1078 log_error("Failed to reexecute: %m");
1082 fclose(serialization);