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 "load-fragment.h"
49 ACTION_DUMP_CONFIGURATION_ITEMS,
51 } action = ACTION_RUN;
53 static char *default_unit = NULL;
54 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
56 static bool dump_core = true;
57 static bool crash_shell = false;
58 static int crash_chvt = -1;
59 static bool confirm_spawn = false;
60 static FILE* serialization = NULL;
62 _noreturn_ static void freeze(void) {
67 static void nop_handler(int sig) {
70 _noreturn_ static void crash(int sig) {
73 log_error("Caught <%s>, not dumping core.", strsignal(sig));
78 /* We want to wait for the core process, hence let's enable SIGCHLD */
80 sa.sa_handler = nop_handler;
81 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
82 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
84 if ((pid = fork()) < 0)
85 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
90 /* Enable default signal handler for core dump */
92 sa.sa_handler = SIG_DFL;
93 assert_se(sigaction(sig, &sa, NULL) == 0);
95 /* Don't limit the core dump size */
97 rl.rlim_cur = RLIM_INFINITY;
98 rl.rlim_max = RLIM_INFINITY;
99 setrlimit(RLIMIT_CORE, &rl);
101 /* Just to be sure... */
102 assert_se(chdir("/") == 0);
104 /* Raise the signal again */
107 assert_not_reached("We shouldn't be here...");
113 /* Order things nicely. */
114 if ((r = waitpid(pid, &status, 0)) < 0)
115 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
116 else if (!WCOREDUMP(status))
117 log_error("Caught <%s>, core dump failed.", strsignal(sig));
119 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
130 log_info("Executing crash shell in 10s...");
133 /* Let the kernel reap children for us */
135 sa.sa_handler = SIG_IGN;
136 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
137 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
139 if ((pid = fork()) < 0)
140 log_error("Failed to fork off crash shell: %s", strerror(errno));
144 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
145 log_error("Failed to acquire terminal: %s", strerror(-fd));
146 else if ((r = make_stdio(fd)) < 0)
147 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
149 execl("/bin/sh", "/bin/sh", NULL);
151 log_error("execl() failed: %s", strerror(errno));
155 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
158 log_info("Freezing execution.");
162 static void install_crash_handler(void) {
167 sa.sa_handler = crash;
168 sa.sa_flags = SA_NODEFER;
170 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
173 static int make_null_stdio(void) {
176 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
177 log_error("Failed to open /dev/null: %m");
181 if ((r = make_stdio(null_fd)) < 0)
182 log_warning("Failed to dup2() device: %s", strerror(-r));
187 static int console_setup(bool do_reset) {
190 /* If we are init, we connect stdin/stdout/stderr to /dev/null
191 * and make sure we don't have a controlling tty. */
198 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
199 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
203 if ((r = reset_terminal(tty_fd)) < 0)
204 log_error("Failed to reset /dev/console: %s", strerror(-r));
206 close_nointr_nofail(tty_fd);
210 static int set_default_unit(const char *u) {
215 if (!(c = strdup(u)))
223 static int parse_proc_cmdline_word(const char *word) {
225 static const char * const rlmap[] = {
226 "single", SPECIAL_RESCUE_TARGET,
227 "-s", SPECIAL_RESCUE_TARGET,
228 "s", SPECIAL_RESCUE_TARGET,
229 "S", SPECIAL_RESCUE_TARGET,
230 "1", SPECIAL_RESCUE_TARGET,
231 "2", SPECIAL_RUNLEVEL2_TARGET,
232 "3", SPECIAL_RUNLEVEL3_TARGET,
233 "4", SPECIAL_RUNLEVEL4_TARGET,
234 "5", SPECIAL_RUNLEVEL5_TARGET
237 if (startswith(word, "systemd.unit="))
238 return set_default_unit(word + 13);
240 else if (startswith(word, "systemd.log_target=")) {
242 if (log_set_target_from_string(word + 19) < 0)
243 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
245 } else if (startswith(word, "systemd.log_level=")) {
247 if (log_set_max_level_from_string(word + 18) < 0)
248 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
250 } else if (startswith(word, "systemd.log_color=")) {
252 if (log_show_color_from_string(word + 18) < 0)
253 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
255 } else if (startswith(word, "systemd.log_location=")) {
257 if (log_show_location_from_string(word + 21) < 0)
258 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
260 } else if (startswith(word, "systemd.dump_core=")) {
263 if ((r = parse_boolean(word + 18)) < 0)
264 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
268 } else if (startswith(word, "systemd.crash_shell=")) {
271 if ((r = parse_boolean(word + 20)) < 0)
272 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
277 } else if (startswith(word, "systemd.confirm_spawn=")) {
280 if ((r = parse_boolean(word + 22)) < 0)
281 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
285 } else if (startswith(word, "systemd.crash_chvt=")) {
288 if (safe_atoi(word + 19, &k) < 0)
289 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
293 } else if (startswith(word, "systemd.")) {
295 log_warning("Unknown kernel switch %s. Ignoring.", word);
297 log_info("Supported kernel switches:\n"
298 "systemd.unit=UNIT Default unit to start\n"
299 "systemd.log_target=console|kmsg|syslog| Log target\n"
300 " syslog-org-kmsg|null\n"
301 "systemd.log_level=LEVEL Log level\n"
302 "systemd.log_color=0|1 Highlight important log messages\n"
303 "systemd.log_location=0|1 Include code location in log messages\n"
304 "systemd.dump_core=0|1 Dump core on crash\n"
305 "systemd.crash_shell=0|1 On crash run shell\n"
306 "systemd.crash_chvt=N Change to VT #N on crash\n"
307 "systemd.confirm_spawn=0|1 Confirm every process spawn");
312 /* SysV compatibility */
313 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
314 if (streq(word, rlmap[i]))
315 return set_default_unit(rlmap[i+1]);
321 static int parse_proc_cmdline(void) {
328 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
329 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
333 FOREACH_WORD_QUOTED(w, l, line, state) {
336 if (!(word = strndup(w, l))) {
341 r = parse_proc_cmdline_word(word);
355 static int parse_argv(int argc, char *argv[]) {
358 ARG_LOG_LEVEL = 0x100,
365 ARG_DUMP_CONFIGURATION_ITEMS,
371 static const struct option options[] = {
372 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
373 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
374 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
375 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
376 { "unit", required_argument, NULL, ARG_UNIT },
377 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
378 { "test", no_argument, NULL, ARG_TEST },
379 { "help", no_argument, NULL, 'h' },
380 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
381 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
382 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
383 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
392 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
397 if ((r = log_set_max_level_from_string(optarg)) < 0) {
398 log_error("Failed to parse log level %s.", optarg);
406 if ((r = log_set_target_from_string(optarg)) < 0) {
407 log_error("Failed to parse log target %s.", optarg);
415 if ((r = log_show_color_from_string(optarg)) < 0) {
416 log_error("Failed to parse log color setting %s.", optarg);
422 case ARG_LOG_LOCATION:
424 if ((r = log_show_location_from_string(optarg)) < 0) {
425 log_error("Failed to parse log location setting %s.", optarg);
433 if ((r = set_default_unit(optarg)) < 0) {
434 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
440 case ARG_RUNNING_AS: {
443 if ((as = manager_running_as_from_string(optarg)) < 0) {
444 log_error("Failed to parse running as value %s", optarg);
453 action = ACTION_TEST;
456 case ARG_DUMP_CONFIGURATION_ITEMS:
457 action = ACTION_DUMP_CONFIGURATION_ITEMS;
460 case ARG_CONFIRM_SPAWN:
461 confirm_spawn = true;
464 case ARG_DESERIALIZE: {
468 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
469 log_error("Failed to parse deserialize option %s.", optarg);
473 if (!(f = fdopen(fd, "r"))) {
474 log_error("Failed to open serialization fd: %m");
479 fclose(serialization);
486 case ARG_INTROSPECT: {
487 const char * const * i = NULL;
489 for (i = bus_interface_table; *i; i += 2)
490 if (!optarg || streq(i[0], optarg)) {
491 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
494 fputs("</node>\n", stdout);
501 log_error("Unknown interface %s.", optarg);
503 action = ACTION_DONE;
508 action = ACTION_HELP;
515 log_error("Unknown option code %c", c);
519 /* PID 1 will get the kernel arguments as parameters, which we
520 * ignore and unconditionally read from
521 * /proc/cmdline. However, we need to ignore those arguments
523 if (running_as != MANAGER_INIT && optind < argc) {
524 log_error("Excess arguments.");
531 static int help(void) {
533 printf("%s [options]\n\n"
534 "Starts up and maintains the system or a session.\n\n"
535 " -h --help Show this help\n"
536 " --unit=UNIT Set default unit\n"
537 " --running-as=AS Set running as (init, system, session)\n"
538 " --test Determine startup sequence, dump it and exit\n"
539 " --dump-configuration-items Dump understood unit configuration items\n"
540 " --confirm-spawn Ask for confirmation when spawning processes\n"
541 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
542 " --log-level=LEVEL Set log level\n"
543 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
544 " --log-color[=0|1] Highlight import log messages\n"
545 " --log-location[=0|1] Include code location in log messages\n",
546 program_invocation_short_name);
551 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
560 if ((r = manager_open_serialization(&f)) < 0) {
561 log_error("Failed to create serialization faile: %s", strerror(-r));
565 if (!(fds = fdset_new())) {
567 log_error("Failed to allocate fd set: %s", strerror(-r));
571 if ((r = manager_serialize(m, f, fds)) < 0) {
572 log_error("Failed to serialize state: %s", strerror(-r));
576 if (fseeko(f, 0, SEEK_SET) < 0) {
577 log_error("Failed to rewind serialization fd: %m");
581 if ((r = fd_cloexec(fileno(f), false)) < 0) {
582 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
586 if ((r = fdset_cloexec(fds, false)) < 0) {
587 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
605 int main(int argc, char *argv[]) {
611 bool reexecute = false;
613 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
614 /* This is compatbility support for SysV, where
615 * calling init as a user is identical to telinit. */
618 execv(SYSTEMCTL_BINARY_PATH, argv);
619 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
623 log_show_color(true);
624 log_show_location(false);
625 log_set_max_level(LOG_DEBUG);
628 running_as = MANAGER_INIT;
629 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
631 running_as = MANAGER_SESSION;
632 log_set_target(LOG_TARGET_CONSOLE);
635 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
638 /* Mount /proc, /sys and friends, so that /proc/cmdline and
639 * /proc/$PID/fd is available. */
641 if (mount_setup() < 0)
644 /* Reset all signal handlers. */
645 assert_se(reset_all_signal_handlers() == 0);
647 /* If we are init, we can block sigkill. Yay. */
648 ignore_signals(SIGNALS_IGNORE, -1);
650 if (running_as != MANAGER_SESSION)
651 if (parse_proc_cmdline() < 0)
654 log_parse_environment();
656 if (parse_argv(argc, argv) < 0)
659 if (action == ACTION_HELP) {
662 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
663 unit_dump_config_items(stdout);
666 } else if (action == ACTION_DONE) {
671 assert_se(action == ACTION_RUN || action == ACTION_TEST);
673 /* Remember open file descriptors for later deserialization */
675 if ((r = fdset_new_fill(&fds)) < 0) {
676 log_error("Failed to allocate fd set: %s", strerror(-r));
680 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
682 close_all_fds(NULL, 0);
684 /* Set up PATH unless it is already set */
686 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
687 running_as == MANAGER_INIT);
689 /* Move out of the way, so that we won't block unmounts */
690 assert_se(chdir("/") == 0);
692 if (running_as != MANAGER_SESSION) {
693 /* Become a session leader if we aren't one yet. */
696 /* Disable the umask logic */
700 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
701 dbus_connection_set_change_sigpipe(FALSE);
703 /* Reset the console, but only if this is really init and we
704 * are freshly booted */
705 if (running_as != MANAGER_SESSION && action == ACTION_RUN) {
706 console_setup(getpid() == 1 && !serialization);
710 /* Open the logging devices, if possible and necessary */
713 /* Make sure we leave a core dump without panicing the
716 install_crash_handler();
718 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
720 if (running_as == MANAGER_INIT) {
726 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
727 log_error("Failed to allocate manager object: %s", strerror(-r));
731 if ((r = manager_startup(m, serialization, fds)) < 0)
732 log_error("Failed to fully start up daemon: %s", strerror(-r));
735 /* This will close all file descriptors that were opened, but
736 * not claimed by any unit. */
743 fclose(serialization);
744 serialization = NULL;
746 log_debug("Activating default unit: %s", default_unit);
748 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
749 log_error("Failed to load default target: %s", strerror(-r));
751 log_info("Trying to load rescue target...");
752 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
753 log_error("Failed to load rescue target: %s", strerror(-r));
758 if (action == ACTION_TEST) {
759 printf("-> By units:\n");
760 manager_dump_units(m, stdout, "\t");
763 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
764 log_error("Failed to start default target: %s", strerror(-r));
768 if (action == ACTION_TEST) {
769 printf("-> By jobs:\n");
770 manager_dump_jobs(m, stdout, "\t");
777 if ((r = manager_loop(m)) < 0) {
778 log_error("Failed to run mainloop: %s", strerror(-r));
782 switch (m->exit_code) {
790 if ((r = manager_reload(m)) < 0)
791 log_error("Failed to reload: %s", strerror(-r));
794 case MANAGER_REEXECUTE:
795 if (prepare_reexecute(m, &serialization, &fds) < 0)
799 log_debug("Reexecuting.");
803 assert_not_reached("Unknown exit code.");
816 const char *args[11];
820 assert(serialization);
823 args[i++] = SYSTEMD_BINARY_PATH;
825 args[i++] = "--log-level";
826 args[i++] = log_level_to_string(log_get_max_level());
828 args[i++] = "--log-target";
829 args[i++] = log_target_to_string(log_get_target());
831 args[i++] = "--running-as";
832 args[i++] = manager_running_as_to_string(running_as);
834 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
837 args[i++] = "--deserialize";
841 args[i++] = "--confirm-spawn";
845 assert(i <= ELEMENTSOF(args));
847 execv(args[0], (char* const*) args);
849 log_error("Failed to reexecute: %m");
853 fclose(serialization);