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"
50 ACTION_DUMP_CONFIGURATION_ITEMS,
52 } arg_action = ACTION_RUN;
54 static char *arg_default_unit = NULL;
55 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
57 static bool arg_dump_core = true;
58 static bool arg_crash_shell = false;
59 static int arg_crash_chvt = -1;
60 static bool arg_confirm_spawn = false;
61 static bool arg_nomodules = false;
62 static bool arg_show_status = true;
64 static FILE* serialization = NULL;
66 _noreturn_ static void freeze(void) {
71 static void nop_handler(int sig) {
74 _noreturn_ static void crash(int sig) {
77 log_error("Caught <%s>, not dumping core.", strsignal(sig));
82 /* We want to wait for the core process, hence let's enable SIGCHLD */
84 sa.sa_handler = nop_handler;
85 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
86 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
88 if ((pid = fork()) < 0)
89 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
94 /* Enable default signal handler for core dump */
96 sa.sa_handler = SIG_DFL;
97 assert_se(sigaction(sig, &sa, NULL) == 0);
99 /* Don't limit the core dump size */
101 rl.rlim_cur = RLIM_INFINITY;
102 rl.rlim_max = RLIM_INFINITY;
103 setrlimit(RLIMIT_CORE, &rl);
105 /* Just to be sure... */
106 assert_se(chdir("/") == 0);
108 /* Raise the signal again */
111 assert_not_reached("We shouldn't be here...");
117 /* Order things nicely. */
118 if ((r = waitpid(pid, &status, 0)) < 0)
119 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
120 else if (!WCOREDUMP(status))
121 log_error("Caught <%s>, core dump failed.", strsignal(sig));
123 log_error("Caught <%s>, dumped core as pid %lu.", strsignal(sig), (unsigned long) pid);
128 chvt(arg_crash_chvt);
130 if (arg_crash_shell) {
134 log_info("Executing crash shell in 10s...");
137 /* Let the kernel reap children for us */
139 sa.sa_handler = SIG_IGN;
140 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
141 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
143 if ((pid = fork()) < 0)
144 log_error("Failed to fork off crash shell: %s", strerror(errno));
148 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
149 log_error("Failed to acquire terminal: %s", strerror(-fd));
150 else if ((r = make_stdio(fd)) < 0)
151 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
153 execl("/bin/sh", "/bin/sh", NULL);
155 log_error("execl() failed: %s", strerror(errno));
159 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
162 log_info("Freezing execution.");
166 static void install_crash_handler(void) {
171 sa.sa_handler = crash;
172 sa.sa_flags = SA_NODEFER;
174 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
177 static int make_null_stdio(void) {
180 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
181 log_error("Failed to open /dev/null: %m");
185 if ((r = make_stdio(null_fd)) < 0)
186 log_warning("Failed to dup2() device: %s", strerror(-r));
191 static int console_setup(bool do_reset) {
194 /* If we are init, we connect stdin/stdout/stderr to /dev/null
195 * and make sure we don't have a controlling tty. */
202 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
203 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
207 if ((r = reset_terminal(tty_fd)) < 0)
208 log_error("Failed to reset /dev/console: %s", strerror(-r));
210 close_nointr_nofail(tty_fd);
214 static int set_default_unit(const char *u) {
219 if (!(c = strdup(u)))
222 free(arg_default_unit);
223 arg_default_unit = c;
227 static int parse_proc_cmdline_word(const char *word) {
229 static const char * const rlmap[] = {
230 "single", SPECIAL_RESCUE_TARGET,
231 "-s", SPECIAL_RESCUE_TARGET,
232 "s", SPECIAL_RESCUE_TARGET,
233 "S", SPECIAL_RESCUE_TARGET,
234 "1", SPECIAL_RESCUE_TARGET,
235 "2", SPECIAL_RUNLEVEL2_TARGET,
236 "3", SPECIAL_RUNLEVEL3_TARGET,
237 "4", SPECIAL_RUNLEVEL4_TARGET,
238 "5", SPECIAL_RUNLEVEL5_TARGET
240 bool ignore_quiet = false;
242 if (startswith(word, "systemd.unit="))
243 return set_default_unit(word + 13);
245 else if (startswith(word, "systemd.log_target=")) {
247 if (log_set_target_from_string(word + 19) < 0)
248 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
250 } else if (startswith(word, "systemd.log_level=")) {
252 if (log_set_max_level_from_string(word + 18) < 0)
253 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
255 } else if (startswith(word, "systemd.log_color=")) {
257 if (log_show_color_from_string(word + 18) < 0)
258 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
260 } else if (startswith(word, "systemd.log_location=")) {
262 if (log_show_location_from_string(word + 21) < 0)
263 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
265 } else if (startswith(word, "systemd.dump_core=")) {
268 if ((r = parse_boolean(word + 18)) < 0)
269 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
273 } else if (startswith(word, "systemd.crash_shell=")) {
276 if ((r = parse_boolean(word + 20)) < 0)
277 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
281 } else if (startswith(word, "systemd.confirm_spawn=")) {
284 if ((r = parse_boolean(word + 22)) < 0)
285 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
287 arg_confirm_spawn = r;
289 } else if (startswith(word, "systemd.crash_chvt=")) {
292 if (safe_atoi(word + 19, &k) < 0)
293 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
297 } else if (startswith(word, "systemd.show_status=")) {
300 if ((r = parse_boolean(word + 20)) < 0)
301 log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
307 } else if (startswith(word, "systemd.")) {
309 log_warning("Unknown kernel switch %s. Ignoring.", word);
311 log_info("Supported kernel switches:\n"
312 "systemd.unit=UNIT Default unit to start\n"
313 "systemd.log_target=console|kmsg|syslog| Log target\n"
314 " syslog-org-kmsg|null\n"
315 "systemd.log_level=LEVEL Log level\n"
316 "systemd.log_color=0|1 Highlight important log messages\n"
317 "systemd.log_location=0|1 Include code location in log messages\n"
318 "systemd.dump_core=0|1 Dump core on crash\n"
319 "systemd.crash_shell=0|1 Run shell on crash\n"
320 "systemd.crash_chvt=N Change to VT #N on crash\n"
321 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
322 "systemd.show_status=0|1 Show status updates on the console during bootup\n");
324 } else if (streq(word, "nomodules"))
325 arg_nomodules = true;
326 else if (streq(word, "quiet")) {
328 arg_show_status = false;
332 /* SysV compatibility */
333 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
334 if (streq(word, rlmap[i]))
335 return set_default_unit(rlmap[i+1]);
341 static int parse_proc_cmdline(void) {
348 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
349 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
353 FOREACH_WORD_QUOTED(w, l, line, state) {
356 if (!(word = strndup(w, l))) {
361 r = parse_proc_cmdline_word(word);
375 static int parse_argv(int argc, char *argv[]) {
378 ARG_LOG_LEVEL = 0x100,
385 ARG_DUMP_CONFIGURATION_ITEMS,
394 static const struct option options[] = {
395 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
396 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
397 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
398 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
399 { "unit", required_argument, NULL, ARG_UNIT },
400 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
401 { "test", no_argument, NULL, ARG_TEST },
402 { "help", no_argument, NULL, 'h' },
403 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
404 { "dump-core", no_argument, NULL, ARG_DUMP_CORE },
405 { "crash-shell", no_argument, NULL, ARG_CRASH_SHELL },
406 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
407 { "show-status", no_argument, NULL, ARG_SHOW_STATUS },
408 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
409 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
418 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
423 if ((r = log_set_max_level_from_string(optarg)) < 0) {
424 log_error("Failed to parse log level %s.", optarg);
432 if ((r = log_set_target_from_string(optarg)) < 0) {
433 log_error("Failed to parse log target %s.", optarg);
442 if ((r = log_show_color_from_string(optarg)) < 0) {
443 log_error("Failed to parse log color setting %s.", optarg);
447 log_show_color(true);
451 case ARG_LOG_LOCATION:
454 if ((r = log_show_location_from_string(optarg)) < 0) {
455 log_error("Failed to parse log location setting %s.", optarg);
459 log_show_location(true);
465 if ((r = set_default_unit(optarg)) < 0) {
466 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
472 case ARG_RUNNING_AS: {
475 if ((as = manager_running_as_from_string(optarg)) < 0) {
476 log_error("Failed to parse running as value %s", optarg);
485 arg_action = ACTION_TEST;
488 case ARG_DUMP_CONFIGURATION_ITEMS:
489 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
493 arg_dump_core = true;
496 case ARG_CRASH_SHELL:
497 arg_crash_shell = true;
500 case ARG_CONFIRM_SPAWN:
501 arg_confirm_spawn = true;
504 case ARG_SHOW_STATUS:
505 arg_show_status = true;
508 case ARG_DESERIALIZE: {
512 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
513 log_error("Failed to parse deserialize option %s.", optarg);
517 if (!(f = fdopen(fd, "r"))) {
518 log_error("Failed to open serialization fd: %m");
523 fclose(serialization);
530 case ARG_INTROSPECT: {
531 const char * const * i = NULL;
533 for (i = bus_interface_table; *i; i += 2)
534 if (!optarg || streq(i[0], optarg)) {
535 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
538 fputs("</node>\n", stdout);
545 log_error("Unknown interface %s.", optarg);
547 arg_action = ACTION_DONE;
552 arg_action = ACTION_HELP;
559 log_error("Unknown option code %c", c);
563 /* PID 1 will get the kernel arguments as parameters, which we
564 * ignore and unconditionally read from
565 * /proc/cmdline. However, we need to ignore those arguments
567 if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
568 log_error("Excess arguments.");
575 static int help(void) {
577 printf("%s [OPTIONS...]\n\n"
578 "Starts up and maintains the system or a session.\n\n"
579 " -h --help Show this help\n"
580 " --test Determine startup sequence, dump it and exit\n"
581 " --dump-configuration-items Dump understood unit configuration items\n"
582 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
583 " --unit=UNIT Set default unit\n"
584 " --running-as=AS Set running as (system, session)\n"
585 " --dump-core Dump core on crash\n"
586 " --crash-shell Run shell on crash\n"
587 " --confirm-spawn Ask for confirmation when spawning processes\n"
588 " --show-status Show status updates on the console during bootup\n"
589 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
590 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
591 " --log-color[=0|1] Highlight important log messages\n"
592 " --log-location[=0|1] Include code location in log messages\n",
593 program_invocation_short_name);
598 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
607 if ((r = manager_open_serialization(&f)) < 0) {
608 log_error("Failed to create serialization faile: %s", strerror(-r));
612 if (!(fds = fdset_new())) {
614 log_error("Failed to allocate fd set: %s", strerror(-r));
618 if ((r = manager_serialize(m, f, fds)) < 0) {
619 log_error("Failed to serialize state: %s", strerror(-r));
623 if (fseeko(f, 0, SEEK_SET) < 0) {
624 log_error("Failed to rewind serialization fd: %m");
628 if ((r = fd_cloexec(fileno(f), false)) < 0) {
629 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
633 if ((r = fdset_cloexec(fds, false)) < 0) {
634 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
652 int main(int argc, char *argv[]) {
658 bool reexecute = false;
660 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
661 /* This is compatbility support for SysV, where
662 * calling init as a user is identical to telinit. */
665 execv(SYSTEMCTL_BINARY_PATH, argv);
666 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
670 log_show_color(true);
671 log_show_location(false);
672 log_set_max_level(LOG_DEBUG);
675 arg_running_as = MANAGER_SYSTEM;
676 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
678 arg_running_as = MANAGER_SESSION;
679 log_set_target(LOG_TARGET_CONSOLE);
682 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
685 /* Mount /proc, /sys and friends, so that /proc/cmdline and
686 * /proc/$PID/fd is available. */
688 if (mount_setup() < 0)
691 /* Reset all signal handlers. */
692 assert_se(reset_all_signal_handlers() == 0);
694 /* If we are init, we can block sigkill. Yay. */
695 ignore_signals(SIGNALS_IGNORE, -1);
697 if (arg_running_as == MANAGER_SYSTEM)
698 if (parse_proc_cmdline() < 0)
701 log_parse_environment();
703 if (parse_argv(argc, argv) < 0)
706 if (arg_action == ACTION_HELP) {
709 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
710 unit_dump_config_items(stdout);
713 } else if (arg_action == ACTION_DONE) {
718 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
720 /* Remember open file descriptors for later deserialization */
722 if ((r = fdset_new_fill(&fds)) < 0) {
723 log_error("Failed to allocate fd set: %s", strerror(-r));
727 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
729 close_all_fds(NULL, 0);
731 /* Set up PATH unless it is already set */
733 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
734 arg_running_as == MANAGER_SYSTEM);
736 /* Move out of the way, so that we won't block unmounts */
737 assert_se(chdir("/") == 0);
739 if (arg_running_as == MANAGER_SYSTEM) {
740 /* Become a session leader if we aren't one yet. */
743 /* Disable the umask logic */
747 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
748 dbus_connection_set_change_sigpipe(FALSE);
750 /* Reset the console, but only if this is really init and we
751 * are freshly booted */
752 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
753 console_setup(getpid() == 1 && !serialization);
757 /* Open the logging devices, if possible and necessary */
760 /* Make sure we leave a core dump without panicing the
763 install_crash_handler();
765 log_debug(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
767 if (arg_running_as == MANAGER_SYSTEM && !serialization) {
769 modprobe_setup(arg_nomodules);
775 if ((r = manager_new(arg_running_as, &m)) < 0) {
776 log_error("Failed to allocate manager object: %s", strerror(-r));
780 m->confirm_spawn = arg_confirm_spawn;
781 m->show_status = arg_show_status;
783 if ((r = manager_startup(m, serialization, fds)) < 0)
784 log_error("Failed to fully start up daemon: %s", strerror(-r));
787 /* This will close all file descriptors that were opened, but
788 * not claimed by any unit. */
795 fclose(serialization);
796 serialization = NULL;
798 log_debug("Activating default unit: %s", arg_default_unit);
800 if ((r = manager_load_unit(m, arg_default_unit, NULL, &target)) < 0) {
801 log_error("Failed to load default target: %s", strerror(-r));
803 log_info("Trying to load rescue target...");
804 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
805 log_error("Failed to load rescue target: %s", strerror(-r));
810 if (arg_action == ACTION_TEST) {
811 printf("-> By units:\n");
812 manager_dump_units(m, stdout, "\t");
815 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
816 log_error("Failed to start default target: %s", strerror(-r));
820 if (arg_action == ACTION_TEST) {
821 printf("-> By jobs:\n");
822 manager_dump_jobs(m, stdout, "\t");
829 if ((r = manager_loop(m)) < 0) {
830 log_error("Failed to run mainloop: %s", strerror(-r));
834 switch (m->exit_code) {
842 if ((r = manager_reload(m)) < 0)
843 log_error("Failed to reload: %s", strerror(-r));
846 case MANAGER_REEXECUTE:
847 if (prepare_reexecute(m, &serialization, &fds) < 0)
851 log_debug("Reexecuting.");
855 assert_not_reached("Unknown exit code.");
863 free(arg_default_unit);
868 const char *args[11];
872 assert(serialization);
875 args[i++] = SYSTEMD_BINARY_PATH;
877 args[i++] = "--log-level";
878 args[i++] = log_level_to_string(log_get_max_level());
880 args[i++] = "--log-target";
881 args[i++] = log_target_to_string(log_get_target());
883 args[i++] = "--running-as";
884 args[i++] = manager_running_as_to_string(arg_running_as);
886 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
889 args[i++] = "--deserialize";
892 if (arg_confirm_spawn)
893 args[i++] = "--confirm-spawn";
897 assert(i <= ELEMENTSOF(args));
899 execv(args[0], (char* const*) args);
901 log_error("Failed to reexecute: %m");
905 fclose(serialization);