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"
48 ACTION_DUMP_CONFIGURATION_ITEMS,
50 } action = ACTION_RUN;
52 static char *default_unit = NULL;
53 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
55 static bool dump_core = true;
56 static bool crash_shell = false;
57 static int crash_chvt = -1;
58 static bool confirm_spawn = false;
59 static FILE* serialization = NULL;
61 _noreturn_ static void freeze(void) {
66 static void nop_handler(int sig) {
69 _noreturn_ static void crash(int sig) {
72 log_error("Caught <%s>, not dumping core.", strsignal(sig));
77 /* We want to wait for the core process, hence let's enable SIGCHLD */
79 sa.sa_handler = nop_handler;
80 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
81 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
83 if ((pid = fork()) < 0)
84 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
89 /* Enable default signal handler for core dump */
91 sa.sa_handler = SIG_DFL;
92 assert_se(sigaction(sig, &sa, NULL) == 0);
94 /* Don't limit the core dump size */
96 rl.rlim_cur = RLIM_INFINITY;
97 rl.rlim_max = RLIM_INFINITY;
98 setrlimit(RLIMIT_CORE, &rl);
100 /* Just to be sure... */
101 assert_se(chdir("/") == 0);
103 /* Raise the signal again */
106 assert_not_reached("We shouldn't be here...");
112 /* Order things nicely. */
113 if ((r = waitpid(pid, &status, 0)) < 0)
114 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
115 else if (!WCOREDUMP(status))
116 log_error("Caught <%s>, core dump failed.", strsignal(sig));
118 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
129 log_info("Executing crash shell in 10s...");
132 /* Let the kernel reap children for us */
134 sa.sa_handler = SIG_IGN;
135 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
136 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
138 if ((pid = fork()) < 0)
139 log_error("Failed to fork off crash shell: %s", strerror(errno));
143 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
144 log_error("Failed to acquire terminal: %s", strerror(-fd));
145 else if ((r = make_stdio(fd)) < 0)
146 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
148 execl("/bin/sh", "/bin/sh", NULL);
150 log_error("execl() failed: %s", strerror(errno));
154 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
157 log_info("Freezing execution.");
161 static void install_crash_handler(void) {
166 sa.sa_handler = crash;
167 sa.sa_flags = SA_NODEFER;
169 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
172 static int make_null_stdio(void) {
175 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
176 log_error("Failed to open /dev/null: %m");
180 if ((r = make_stdio(null_fd)) < 0)
181 log_warning("Failed to dup2() device: %s", strerror(-r));
186 static int console_setup(bool do_reset) {
189 /* If we are init, we connect stdin/stdout/stderr to /dev/null
190 * and make sure we don't have a controlling tty. */
197 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
198 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
202 if ((r = reset_terminal(tty_fd)) < 0)
203 log_error("Failed to reset /dev/console: %s", strerror(-r));
205 close_nointr_nofail(tty_fd);
209 static int set_default_unit(const char *u) {
214 if (!(c = strdup(u)))
222 static int parse_proc_cmdline_word(const char *word) {
224 static const char * const rlmap[] = {
225 "single", SPECIAL_RUNLEVEL1_TARGET,
226 "-s", SPECIAL_RUNLEVEL1_TARGET,
227 "s", SPECIAL_RUNLEVEL1_TARGET,
228 "S", SPECIAL_RUNLEVEL1_TARGET,
229 "1", SPECIAL_RUNLEVEL1_TARGET,
230 "2", SPECIAL_RUNLEVEL2_TARGET,
231 "3", SPECIAL_RUNLEVEL3_TARGET,
232 "4", SPECIAL_RUNLEVEL4_TARGET,
233 "5", SPECIAL_RUNLEVEL5_TARGET
236 if (startswith(word, "systemd.default="))
237 return set_default_unit(word + 16);
239 else if (startswith(word, "systemd.log_target=")) {
241 if (log_set_target_from_string(word + 19) < 0)
242 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
244 } else if (startswith(word, "systemd.log_level=")) {
246 if (log_set_max_level_from_string(word + 18) < 0)
247 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
249 } else if (startswith(word, "systemd.dump_core=")) {
252 if ((r = parse_boolean(word + 18)) < 0)
253 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
257 } else if (startswith(word, "systemd.crash_shell=")) {
260 if ((r = parse_boolean(word + 20)) < 0)
261 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
266 } else if (startswith(word, "systemd.confirm_spawn=")) {
269 if ((r = parse_boolean(word + 22)) < 0)
270 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
274 } else if (startswith(word, "systemd.crash_chvt=")) {
277 if (safe_atoi(word + 19, &k) < 0)
278 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
282 } else if (startswith(word, "systemd.")) {
284 log_warning("Unknown kernel switch %s. Ignoring.", word);
286 log_info("Supported kernel switches:");
287 log_info("systemd.default=UNIT Default unit to start");
288 log_info("systemd.log_target=console|kmsg|syslog Log target");
289 log_info("systemd.log_level=LEVEL Log level");
290 log_info("systemd.dump_core=0|1 Dump core on crash");
291 log_info("systemd.crash_shell=0|1 On crash run shell");
292 log_info("systemd.crash_chvt=N Change to VT #N on crash");
293 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
298 /* SysV compatibility */
299 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
300 if (streq(word, rlmap[i]))
301 return set_default_unit(rlmap[i+1]);
307 static int parse_proc_cmdline(void) {
314 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
315 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
319 FOREACH_WORD_QUOTED(w, l, line, state) {
322 if (!(word = strndup(w, l))) {
327 r = parse_proc_cmdline_word(word);
341 static int parse_argv(int argc, char *argv[]) {
344 ARG_LOG_LEVEL = 0x100,
349 ARG_DUMP_CONFIGURATION_ITEMS,
355 static const struct option options[] = {
356 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
357 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
358 { "default", required_argument, NULL, ARG_DEFAULT },
359 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
360 { "test", no_argument, NULL, ARG_TEST },
361 { "help", no_argument, NULL, 'h' },
362 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
363 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
364 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
365 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
374 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
379 if ((r = log_set_max_level_from_string(optarg)) < 0) {
380 log_error("Failed to parse log level %s.", optarg);
388 if ((r = log_set_target_from_string(optarg)) < 0) {
389 log_error("Failed to parse log target %s.", optarg);
397 if ((r = set_default_unit(optarg)) < 0) {
398 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
404 case ARG_RUNNING_AS: {
407 if ((as = manager_running_as_from_string(optarg)) < 0) {
408 log_error("Failed to parse running as value %s", optarg);
417 action = ACTION_TEST;
420 case ARG_DUMP_CONFIGURATION_ITEMS:
421 action = ACTION_DUMP_CONFIGURATION_ITEMS;
424 case ARG_CONFIRM_SPAWN:
425 confirm_spawn = true;
428 case ARG_DESERIALIZE: {
432 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
433 log_error("Failed to parse deserialize option %s.", optarg);
437 if (!(f = fdopen(fd, "r"))) {
438 log_error("Failed to open serialization fd: %m");
443 fclose(serialization);
450 case ARG_INTROSPECT: {
451 const char * const * i = NULL;
453 for (i = bus_interface_table; *i; i += 2)
454 if (!optarg || streq(i[0], optarg)) {
455 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
458 fputs("</node>\n", stdout);
465 log_error("Unknown interface %s.", optarg);
467 action = ACTION_DONE;
472 action = ACTION_HELP;
479 log_error("Unknown option code %c", c);
483 /* PID 1 will get the kernel arguments as parameters, which we
484 * ignore and unconditionally read from
485 * /proc/cmdline. However, we need to ignore those arguments
487 if (running_as != MANAGER_INIT && optind < argc) {
488 log_error("Excess arguments.");
495 static int help(void) {
497 printf("%s [options]\n\n"
498 " -h --help Show this help\n"
499 " --default=UNIT Set default unit\n"
500 " --log-level=LEVEL Set log level\n"
501 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg)\n"
502 " --running-as=AS Set running as (init, system, session)\n"
503 " --test Determine startup sequence, dump it and exit\n"
504 " --dump-configuration-items Dump understood unit configuration items\n"
505 " --confirm-spawn Ask for confirmation when spawning processes\n"
506 " --introspect[=INTERFACE] Extract D-Bus interface data\n",
512 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
521 if ((r = manager_open_serialization(&f)) < 0) {
522 log_error("Failed to create serialization faile: %s", strerror(-r));
526 if (!(fds = fdset_new())) {
528 log_error("Failed to allocate fd set: %s", strerror(-r));
532 if ((r = manager_serialize(m, f, fds)) < 0) {
533 log_error("Failed to serialize state: %s", strerror(-r));
537 if (fseeko(f, 0, SEEK_SET) < 0) {
538 log_error("Failed to rewind serialization fd: %m");
542 if ((r = fd_cloexec(fileno(f), false)) < 0) {
543 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
547 if ((r = fdset_cloexec(fds, false)) < 0) {
548 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
566 int main(int argc, char *argv[]) {
572 bool reexecute = false;
575 running_as = MANAGER_INIT;
576 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
578 running_as = MANAGER_SESSION;
580 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
583 /* Mount /proc, /sys and friends, so that /proc/cmdline and
584 * /proc/$PID/fd is available. */
586 if (mount_setup() < 0)
589 /* Reset all signal handlers. */
590 assert_se(reset_all_signal_handlers() == 0);
592 /* If we are init, we can block sigkill. Yay. */
593 ignore_signals(SIGNALS_IGNORE, -1);
595 if (running_as != MANAGER_SESSION)
596 if (parse_proc_cmdline() < 0)
599 log_parse_environment();
601 if (parse_argv(argc, argv) < 0)
604 if (action == ACTION_HELP) {
607 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
608 unit_dump_config_items(stdout);
611 } else if (action == ACTION_DONE) {
616 assert_se(action == ACTION_RUN || action == ACTION_TEST);
618 /* Remember open file descriptors for later deserialization */
620 if ((r = fdset_new_fill(&fds)) < 0) {
621 log_error("Failed to allocate fd set: %s", strerror(-r));
625 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
627 close_all_fds(NULL, 0);
629 /* Set up PATH unless it is already set */
631 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
632 running_as == MANAGER_INIT);
634 /* Move out of the way, so that we won't block unmounts */
635 assert_se(chdir("/") == 0);
637 if (running_as != MANAGER_SESSION) {
638 /* Become a session leader if we aren't one yet. */
641 /* Disable the umask logic */
645 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
646 dbus_connection_set_change_sigpipe(FALSE);
648 /* Reset the console, but only if this is really init and we
649 * are freshly booted */
650 if (running_as != MANAGER_SESSION && action == ACTION_RUN) {
651 console_setup(getpid() == 1 && !serialization);
655 /* Open the logging devices, if possible and necessary */
658 /* Make sure we leave a core dump without panicing the
661 install_crash_handler();
663 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
665 if (running_as == MANAGER_INIT) {
671 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
672 log_error("Failed to allocate manager object: %s", strerror(-r));
676 if ((r = manager_startup(m, serialization, fds)) < 0)
677 log_error("Failed to fully start up daemon: %s", strerror(-r));
680 /* This will close all file descriptors that were opened, but
681 * not claimed by any unit. */
688 fclose(serialization);
689 serialization = NULL;
691 log_debug("Activating default unit: %s", default_unit);
693 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
694 log_error("Failed to load default target: %s", strerror(-r));
696 log_info("Trying to load rescue target...");
697 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
698 log_error("Failed to load rescue target: %s", strerror(-r));
703 if (action == ACTION_TEST) {
704 printf("-> By units:\n");
705 manager_dump_units(m, stdout, "\t");
708 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
709 log_error("Failed to start default target: %s", strerror(-r));
713 if (action == ACTION_TEST) {
714 printf("-> By jobs:\n");
715 manager_dump_jobs(m, stdout, "\t");
722 if ((r = manager_loop(m)) < 0) {
723 log_error("Failed to run mainloop: %s", strerror(-r));
727 switch (m->exit_code) {
735 if ((r = manager_reload(m)) < 0)
736 log_error("Failed to reload: %s", strerror(-r));
739 case MANAGER_REEXECUTE:
740 if (prepare_reexecute(m, &serialization, &fds) < 0)
744 log_debug("Reexecuting.");
748 assert_not_reached("Unknown exit code.");
761 const char *args[11];
765 assert(serialization);
768 args[i++] = SYSTEMD_BINARY_PATH;
770 args[i++] = "--log-level";
771 args[i++] = log_level_to_string(log_get_max_level());
773 args[i++] = "--log-target";
774 args[i++] = log_target_to_string(log_get_target());
776 args[i++] = "--running-as";
777 args[i++] = manager_running_as_to_string(running_as);
779 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
782 args[i++] = "--deserialize";
786 args[i++] = "--confirm-spawn";
790 assert(i <= ELEMENTSOF(args));
792 execv(args[0], (char* const*) args);
794 log_error("Failed to reexecute: %m");
798 fclose(serialization);