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;
63 static FILE* serialization = NULL;
65 _noreturn_ static void freeze(void) {
70 static void nop_handler(int sig) {
73 _noreturn_ static void crash(int sig) {
76 log_error("Caught <%s>, not dumping core.", strsignal(sig));
81 /* We want to wait for the core process, hence let's enable SIGCHLD */
83 sa.sa_handler = nop_handler;
84 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
85 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
87 if ((pid = fork()) < 0)
88 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
93 /* Enable default signal handler for core dump */
95 sa.sa_handler = SIG_DFL;
96 assert_se(sigaction(sig, &sa, NULL) == 0);
98 /* Don't limit the core dump size */
100 rl.rlim_cur = RLIM_INFINITY;
101 rl.rlim_max = RLIM_INFINITY;
102 setrlimit(RLIMIT_CORE, &rl);
104 /* Just to be sure... */
105 assert_se(chdir("/") == 0);
107 /* Raise the signal again */
110 assert_not_reached("We shouldn't be here...");
116 /* Order things nicely. */
117 if ((r = waitpid(pid, &status, 0)) < 0)
118 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
119 else if (!WCOREDUMP(status))
120 log_error("Caught <%s>, core dump failed.", strsignal(sig));
122 log_error("Caught <%s>, dumped core as pid %lu.", strsignal(sig), (unsigned long) pid);
127 chvt(arg_crash_chvt);
129 if (arg_crash_shell) {
133 log_info("Executing crash shell in 10s...");
136 /* Let the kernel reap children for us */
138 sa.sa_handler = SIG_IGN;
139 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
140 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
142 if ((pid = fork()) < 0)
143 log_error("Failed to fork off crash shell: %s", strerror(errno));
147 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
148 log_error("Failed to acquire terminal: %s", strerror(-fd));
149 else if ((r = make_stdio(fd)) < 0)
150 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
152 execl("/bin/sh", "/bin/sh", NULL);
154 log_error("execl() failed: %s", strerror(errno));
158 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
161 log_info("Freezing execution.");
165 static void install_crash_handler(void) {
170 sa.sa_handler = crash;
171 sa.sa_flags = SA_NODEFER;
173 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
176 static int make_null_stdio(void) {
179 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
180 log_error("Failed to open /dev/null: %m");
184 if ((r = make_stdio(null_fd)) < 0)
185 log_warning("Failed to dup2() device: %s", strerror(-r));
190 static int console_setup(bool do_reset) {
193 /* If we are init, we connect stdin/stdout/stderr to /dev/null
194 * and make sure we don't have a controlling tty. */
201 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
202 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
206 if ((r = reset_terminal(tty_fd)) < 0)
207 log_error("Failed to reset /dev/console: %s", strerror(-r));
209 close_nointr_nofail(tty_fd);
213 static int set_default_unit(const char *u) {
218 if (!(c = strdup(u)))
221 free(arg_default_unit);
222 arg_default_unit = c;
226 static int parse_proc_cmdline_word(const char *word) {
228 static const char * const rlmap[] = {
229 "single", SPECIAL_RESCUE_TARGET,
230 "-s", SPECIAL_RESCUE_TARGET,
231 "s", SPECIAL_RESCUE_TARGET,
232 "S", SPECIAL_RESCUE_TARGET,
233 "1", SPECIAL_RESCUE_TARGET,
234 "2", SPECIAL_RUNLEVEL2_TARGET,
235 "3", SPECIAL_RUNLEVEL3_TARGET,
236 "4", SPECIAL_RUNLEVEL4_TARGET,
237 "5", SPECIAL_RUNLEVEL5_TARGET
240 if (startswith(word, "systemd.unit="))
241 return set_default_unit(word + 13);
243 else if (startswith(word, "systemd.log_target=")) {
245 if (log_set_target_from_string(word + 19) < 0)
246 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
248 } else if (startswith(word, "systemd.log_level=")) {
250 if (log_set_max_level_from_string(word + 18) < 0)
251 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
253 } else if (startswith(word, "systemd.log_color=")) {
255 if (log_show_color_from_string(word + 18) < 0)
256 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
258 } else if (startswith(word, "systemd.log_location=")) {
260 if (log_show_location_from_string(word + 21) < 0)
261 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
263 } else if (startswith(word, "systemd.dump_core=")) {
266 if ((r = parse_boolean(word + 18)) < 0)
267 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
271 } else if (startswith(word, "systemd.crash_shell=")) {
274 if ((r = parse_boolean(word + 20)) < 0)
275 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
279 } else if (startswith(word, "systemd.confirm_spawn=")) {
282 if ((r = parse_boolean(word + 22)) < 0)
283 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
285 arg_confirm_spawn = r;
287 } else if (startswith(word, "systemd.crash_chvt=")) {
290 if (safe_atoi(word + 19, &k) < 0)
291 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
295 } else if (startswith(word, "systemd.")) {
297 log_warning("Unknown kernel switch %s. Ignoring.", word);
299 log_info("Supported kernel switches:\n"
300 "systemd.unit=UNIT Default unit to start\n"
301 "systemd.log_target=console|kmsg|syslog| Log target\n"
302 " syslog-org-kmsg|null\n"
303 "systemd.log_level=LEVEL Log level\n"
304 "systemd.log_color=0|1 Highlight important log messages\n"
305 "systemd.log_location=0|1 Include code location in log messages\n"
306 "systemd.dump_core=0|1 Dump core on crash\n"
307 "systemd.crash_shell=0|1 On crash run shell\n"
308 "systemd.crash_chvt=N Change to VT #N on crash\n"
309 "systemd.confirm_spawn=0|1 Confirm every process spawn");
311 } else if (streq(word, "nomodules"))
312 arg_nomodules = true;
316 /* SysV compatibility */
317 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
318 if (streq(word, rlmap[i]))
319 return set_default_unit(rlmap[i+1]);
325 static int parse_proc_cmdline(void) {
332 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
333 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
337 FOREACH_WORD_QUOTED(w, l, line, state) {
340 if (!(word = strndup(w, l))) {
345 r = parse_proc_cmdline_word(word);
359 static int parse_argv(int argc, char *argv[]) {
362 ARG_LOG_LEVEL = 0x100,
369 ARG_DUMP_CONFIGURATION_ITEMS,
375 static const struct option options[] = {
376 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
377 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
378 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
379 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
380 { "unit", required_argument, NULL, ARG_UNIT },
381 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
382 { "test", no_argument, NULL, ARG_TEST },
383 { "help", no_argument, NULL, 'h' },
384 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
385 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
386 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
387 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
396 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
401 if ((r = log_set_max_level_from_string(optarg)) < 0) {
402 log_error("Failed to parse log level %s.", optarg);
410 if ((r = log_set_target_from_string(optarg)) < 0) {
411 log_error("Failed to parse log target %s.", optarg);
420 if ((r = log_show_color_from_string(optarg)) < 0) {
421 log_error("Failed to parse log color setting %s.", optarg);
425 log_show_color(true);
429 case ARG_LOG_LOCATION:
432 if ((r = log_show_location_from_string(optarg)) < 0) {
433 log_error("Failed to parse log location setting %s.", optarg);
437 log_show_location(true);
443 if ((r = set_default_unit(optarg)) < 0) {
444 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
450 case ARG_RUNNING_AS: {
453 if ((as = manager_running_as_from_string(optarg)) < 0) {
454 log_error("Failed to parse running as value %s", optarg);
463 arg_action = ACTION_TEST;
466 case ARG_DUMP_CONFIGURATION_ITEMS:
467 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
470 case ARG_CONFIRM_SPAWN:
471 arg_confirm_spawn = true;
474 case ARG_DESERIALIZE: {
478 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
479 log_error("Failed to parse deserialize option %s.", optarg);
483 if (!(f = fdopen(fd, "r"))) {
484 log_error("Failed to open serialization fd: %m");
489 fclose(serialization);
496 case ARG_INTROSPECT: {
497 const char * const * i = NULL;
499 for (i = bus_interface_table; *i; i += 2)
500 if (!optarg || streq(i[0], optarg)) {
501 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
504 fputs("</node>\n", stdout);
511 log_error("Unknown interface %s.", optarg);
513 arg_action = ACTION_DONE;
518 arg_action = ACTION_HELP;
525 log_error("Unknown option code %c", c);
529 /* PID 1 will get the kernel arguments as parameters, which we
530 * ignore and unconditionally read from
531 * /proc/cmdline. However, we need to ignore those arguments
533 if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
534 log_error("Excess arguments.");
541 static int help(void) {
543 printf("%s [OPTIONS...]\n\n"
544 "Starts up and maintains the system or a session.\n\n"
545 " -h --help Show this help\n"
546 " --unit=UNIT Set default unit\n"
547 " --running-as=AS Set running as (system, session)\n"
548 " --test Determine startup sequence, dump it and exit\n"
549 " --dump-configuration-items Dump understood unit configuration items\n"
550 " --confirm-spawn Ask for confirmation when spawning processes\n"
551 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
552 " --log-level=LEVEL Set log level\n"
553 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
554 " --log-color[=0|1] Highlight important log messages\n"
555 " --log-location[=0|1] Include code location in log messages\n",
556 program_invocation_short_name);
561 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
570 if ((r = manager_open_serialization(&f)) < 0) {
571 log_error("Failed to create serialization faile: %s", strerror(-r));
575 if (!(fds = fdset_new())) {
577 log_error("Failed to allocate fd set: %s", strerror(-r));
581 if ((r = manager_serialize(m, f, fds)) < 0) {
582 log_error("Failed to serialize state: %s", strerror(-r));
586 if (fseeko(f, 0, SEEK_SET) < 0) {
587 log_error("Failed to rewind serialization fd: %m");
591 if ((r = fd_cloexec(fileno(f), false)) < 0) {
592 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
596 if ((r = fdset_cloexec(fds, false)) < 0) {
597 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
615 int main(int argc, char *argv[]) {
621 bool reexecute = false;
623 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
624 /* This is compatbility support for SysV, where
625 * calling init as a user is identical to telinit. */
628 execv(SYSTEMCTL_BINARY_PATH, argv);
629 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
633 log_show_color(true);
634 log_show_location(false);
635 log_set_max_level(LOG_DEBUG);
638 arg_running_as = MANAGER_SYSTEM;
639 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
641 arg_running_as = MANAGER_SESSION;
642 log_set_target(LOG_TARGET_CONSOLE);
645 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
648 /* Mount /proc, /sys and friends, so that /proc/cmdline and
649 * /proc/$PID/fd is available. */
651 if (mount_setup() < 0)
654 /* Reset all signal handlers. */
655 assert_se(reset_all_signal_handlers() == 0);
657 /* If we are init, we can block sigkill. Yay. */
658 ignore_signals(SIGNALS_IGNORE, -1);
660 if (arg_running_as == MANAGER_SYSTEM)
661 if (parse_proc_cmdline() < 0)
664 log_parse_environment();
666 if (parse_argv(argc, argv) < 0)
669 if (arg_action == ACTION_HELP) {
672 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
673 unit_dump_config_items(stdout);
676 } else if (arg_action == ACTION_DONE) {
681 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
683 /* Remember open file descriptors for later deserialization */
685 if ((r = fdset_new_fill(&fds)) < 0) {
686 log_error("Failed to allocate fd set: %s", strerror(-r));
690 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
692 close_all_fds(NULL, 0);
694 /* Set up PATH unless it is already set */
696 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
697 arg_running_as == MANAGER_SYSTEM);
699 /* Move out of the way, so that we won't block unmounts */
700 assert_se(chdir("/") == 0);
702 if (arg_running_as == MANAGER_SYSTEM) {
703 /* Become a session leader if we aren't one yet. */
706 /* Disable the umask logic */
710 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
711 dbus_connection_set_change_sigpipe(FALSE);
713 /* Reset the console, but only if this is really init and we
714 * are freshly booted */
715 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
716 console_setup(getpid() == 1 && !serialization);
720 /* Open the logging devices, if possible and necessary */
723 /* Make sure we leave a core dump without panicing the
726 install_crash_handler();
728 log_debug(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
730 if (arg_running_as == MANAGER_SYSTEM) {
731 modprobe_setup(arg_nomodules);
737 if ((r = manager_new(arg_running_as, arg_confirm_spawn, &m)) < 0) {
738 log_error("Failed to allocate manager object: %s", strerror(-r));
742 if ((r = manager_startup(m, serialization, fds)) < 0)
743 log_error("Failed to fully start up daemon: %s", strerror(-r));
746 /* This will close all file descriptors that were opened, but
747 * not claimed by any unit. */
754 fclose(serialization);
755 serialization = NULL;
757 log_debug("Activating default unit: %s", arg_default_unit);
759 if ((r = manager_load_unit(m, arg_default_unit, NULL, &target)) < 0) {
760 log_error("Failed to load default target: %s", strerror(-r));
762 log_info("Trying to load rescue target...");
763 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
764 log_error("Failed to load rescue target: %s", strerror(-r));
769 if (arg_action == ACTION_TEST) {
770 printf("-> By units:\n");
771 manager_dump_units(m, stdout, "\t");
774 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
775 log_error("Failed to start default target: %s", strerror(-r));
779 if (arg_action == ACTION_TEST) {
780 printf("-> By jobs:\n");
781 manager_dump_jobs(m, stdout, "\t");
788 if ((r = manager_loop(m)) < 0) {
789 log_error("Failed to run mainloop: %s", strerror(-r));
793 switch (m->exit_code) {
801 if ((r = manager_reload(m)) < 0)
802 log_error("Failed to reload: %s", strerror(-r));
805 case MANAGER_REEXECUTE:
806 if (prepare_reexecute(m, &serialization, &fds) < 0)
810 log_debug("Reexecuting.");
814 assert_not_reached("Unknown exit code.");
822 free(arg_default_unit);
827 const char *args[11];
831 assert(serialization);
834 args[i++] = SYSTEMD_BINARY_PATH;
836 args[i++] = "--log-level";
837 args[i++] = log_level_to_string(log_get_max_level());
839 args[i++] = "--log-target";
840 args[i++] = log_target_to_string(log_get_target());
842 args[i++] = "--running-as";
843 args[i++] = manager_running_as_to_string(arg_running_as);
845 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
848 args[i++] = "--deserialize";
851 if (arg_confirm_spawn)
852 args[i++] = "--confirm-spawn";
856 assert(i <= ELEMENTSOF(args));
858 execv(args[0], (char* const*) args);
860 log_error("Failed to reexecute: %m");
864 fclose(serialization);