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 "load-fragment.h"
46 ACTION_DUMP_CONFIGURATION_ITEMS
47 } action = ACTION_RUN;
49 static char *default_unit = NULL;
50 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
52 static bool dump_core = true;
53 static bool crash_shell = false;
54 static int crash_chvt = -1;
55 static bool confirm_spawn = false;
56 static FILE* serialization = NULL;
58 _noreturn static void freeze(void) {
63 static void nop_handler(int sig) {
66 _noreturn static void crash(int sig) {
69 log_error("Caught <%s>, not dumping core.", strsignal(sig));
74 /* We want to wait for the core process, hence let's enable SIGCHLD */
76 sa.sa_handler = nop_handler;
77 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
78 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
80 if ((pid = fork()) < 0)
81 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
86 /* Enable default signal handler for core dump */
88 sa.sa_handler = SIG_DFL;
89 assert_se(sigaction(sig, &sa, NULL) == 0);
91 /* Don't limit the core dump size */
93 rl.rlim_cur = RLIM_INFINITY;
94 rl.rlim_max = RLIM_INFINITY;
95 setrlimit(RLIMIT_CORE, &rl);
97 /* Just to be sure... */
98 assert_se(chdir("/") == 0);
100 /* Raise the signal again */
103 assert_not_reached("We shouldn't be here...");
109 /* Order things nicely. */
110 if ((r = waitpid(pid, &status, 0)) < 0)
111 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
112 else if (!WCOREDUMP(status))
113 log_error("Caught <%s>, core dump failed.", strsignal(sig));
115 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
126 log_info("Executing crash shell in 10s...");
129 /* Let the kernel reap children for us */
131 sa.sa_handler = SIG_IGN;
132 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
133 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
135 if ((pid = fork()) < 0)
136 log_error("Failed to fork off crash shell: %s", strerror(errno));
138 execl("/bin/sh", "/bin/sh", NULL);
140 log_error("execl() failed: %s", strerror(errno));
144 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
147 log_info("Freezing execution.");
151 static void install_crash_handler(void) {
156 sa.sa_handler = crash;
157 sa.sa_flags = SA_NODEFER;
159 assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
160 assert_se(sigaction(SIGILL, &sa, NULL) == 0);
161 assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
162 assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
163 assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
164 assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
167 static int console_setup(bool do_reset) {
168 int tty_fd = -1, null_fd = -1, r = 0;
170 /* If we are init, we connect stdout/stderr to /dev/console
171 * and stdin to /dev/null and make sure we don't have a
172 * controlling tty. */
176 if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
177 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
182 if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
183 log_error("Failed to open /dev/null: %m");
189 assert(null_fd >= 3);
192 if (reset_terminal(tty_fd) < 0)
193 log_error("Failed to reset /dev/console: %m");
195 if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
196 dup2(tty_fd, STDERR_FILENO) < 0 ||
197 dup2(null_fd, STDIN_FILENO) < 0) {
198 log_error("Failed to dup2() device: %m");
207 close_nointr_nofail(tty_fd);
210 close_nointr_nofail(null_fd);
215 static int set_default_unit(const char *u) {
220 if (!(c = strdup(u)))
228 static int parse_proc_cmdline_word(const char *word) {
230 static const char * const rlmap[] = {
231 "single", SPECIAL_RUNLEVEL1_TARGET,
232 "-s", SPECIAL_RUNLEVEL1_TARGET,
233 "s", SPECIAL_RUNLEVEL1_TARGET,
234 "S", SPECIAL_RUNLEVEL1_TARGET,
235 "1", SPECIAL_RUNLEVEL1_TARGET,
236 "2", SPECIAL_RUNLEVEL2_TARGET,
237 "3", SPECIAL_RUNLEVEL3_TARGET,
238 "4", SPECIAL_RUNLEVEL4_TARGET,
239 "5", SPECIAL_RUNLEVEL5_TARGET
242 if (startswith(word, "systemd.default="))
243 return set_default_unit(word + 16);
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.dump_core=")) {
258 if ((r = parse_boolean(word + 18)) < 0)
259 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
263 } else if (startswith(word, "systemd.crash_shell=")) {
266 if ((r = parse_boolean(word + 20)) < 0)
267 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
272 } else if (startswith(word, "systemd.confirm_spawn=")) {
275 if ((r = parse_boolean(word + 22)) < 0)
276 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
280 } else if (startswith(word, "systemd.crash_chvt=")) {
283 if (safe_atoi(word + 19, &k) < 0)
284 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
288 } else if (startswith(word, "systemd.")) {
290 log_warning("Unknown kernel switch %s. Ignoring.", word);
292 log_info("Supported kernel switches:");
293 log_info("systemd.default=UNIT Default unit to start");
294 log_info("systemd.log_target=console|kmsg|syslog Log target");
295 log_info("systemd.log_level=LEVEL Log level");
296 log_info("systemd.dump_core=0|1 Dump core on crash");
297 log_info("systemd.crash_shell=0|1 On crash run shell");
298 log_info("systemd.crash_chvt=N Change to VT #N on crash");
299 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
304 /* SysV compatibility */
305 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
306 if (streq(word, rlmap[i]))
307 return set_default_unit(rlmap[i+1]);
313 static int parse_proc_cmdline(void) {
320 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
321 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
325 FOREACH_WORD_QUOTED(w, l, line, state) {
328 if (!(word = strndup(w, l))) {
333 r = parse_proc_cmdline_word(word);
347 static int parse_argv(int argc, char *argv[]) {
350 ARG_LOG_LEVEL = 0x100,
355 ARG_DUMP_CONFIGURATION_ITEMS,
360 static const struct option options[] = {
361 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
362 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
363 { "default", required_argument, NULL, ARG_DEFAULT },
364 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
365 { "test", no_argument, NULL, ARG_TEST },
366 { "help", no_argument, NULL, 'h' },
367 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
368 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
369 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
378 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
383 if ((r = log_set_max_level_from_string(optarg)) < 0) {
384 log_error("Failed to parse log level %s.", optarg);
392 if ((r = log_set_target_from_string(optarg)) < 0) {
393 log_error("Failed to parse log target %s.", optarg);
401 if ((r = set_default_unit(optarg)) < 0) {
402 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
408 case ARG_RUNNING_AS: {
411 if ((as = manager_running_as_from_string(optarg)) < 0) {
412 log_error("Failed to parse running as value %s", optarg);
421 action = ACTION_TEST;
424 case ARG_DUMP_CONFIGURATION_ITEMS:
425 action = ACTION_DUMP_CONFIGURATION_ITEMS;
428 case ARG_CONFIRM_SPAWN:
429 confirm_spawn = true;
432 case ARG_DESERIALIZE: {
436 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
437 log_error("Failed to parse deserialize option %s.", optarg);
441 if (!(f = fdopen(fd, "r"))) {
442 log_error("Failed to open serialization fd: %m");
447 fclose(serialization);
455 action = ACTION_HELP;
462 log_error("Unknown option code %c", c);
469 static int help(void) {
471 printf("%s [options]\n\n"
472 " -h --help Show this help\n"
473 " --default=UNIT Set default unit\n"
474 " --log-level=LEVEL Set log level\n"
475 " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
476 " --running-as=AS Set running as (init, system, session)\n"
477 " --test Determine startup sequence, dump it and exit\n"
478 " --dump-configuration-items Dump understood unit configuration items\n"
479 " --confirm-spawn Ask for confirmation when spawning processes\n",
485 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
494 if ((r = manager_open_serialization(&f)) < 0) {
495 log_error("Failed to create serialization faile: %s", strerror(-r));
499 if (!(fds = fdset_new())) {
501 log_error("Failed to allocate fd set: %s", strerror(-r));
505 if ((r = manager_serialize(m, f, fds)) < 0) {
506 log_error("Failed to serialize state: %s", strerror(-r));
510 if (fseeko(f, 0, SEEK_SET) < 0) {
511 log_error("Failed to rewind serialization fd: %m");
515 if ((r = fd_cloexec(fileno(f), false)) < 0) {
516 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
520 if ((r = fdset_cloexec(fds, false)) < 0) {
521 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
539 int main(int argc, char *argv[]) {
545 bool reexecute = false;
548 running_as = MANAGER_INIT;
549 else if (getuid() == 0)
550 running_as = MANAGER_SYSTEM;
552 running_as = MANAGER_SESSION;
554 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
557 /* Mount /proc, /sys and friends, so that /proc/cmdline and
558 * /proc/$PID/fd is available. */
559 if (mount_setup() < 0)
562 /* Reset all signal handlers. */
563 assert_se(reset_all_signal_handlers() == 0);
565 /* If we are init, we can block sigkill. Yay. */
566 ignore_signal(SIGKILL);
567 ignore_signal(SIGPIPE);
569 if (running_as != MANAGER_SESSION)
570 if (parse_proc_cmdline() < 0)
573 log_parse_environment();
575 if (parse_argv(argc, argv) < 0)
578 if (action == ACTION_HELP) {
581 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
582 unit_dump_config_items(stdout);
587 assert_se(action == ACTION_RUN || action == ACTION_TEST);
589 /* Remember open file descriptors for later deserialization */
591 if ((r = fdset_new_fill(&fds)) < 0) {
592 log_error("Failed to allocate fd set: %s", strerror(-r));
596 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
598 close_all_fds(NULL, 0);
600 /* Set up PATH unless it is already set */
602 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
603 running_as == MANAGER_INIT);
605 /* Move out of the way, so that we won't block unmounts */
606 assert_se(chdir("/") == 0);
608 if (running_as != MANAGER_SESSION) {
609 /* Become a session leader if we aren't one yet. */
612 /* Disable the umask logic */
616 /* Reset the console, but only if this is really init and we
617 * are freshly booted */
618 if (running_as == MANAGER_INIT && action == ACTION_RUN)
619 console_setup(getpid() == 1 && !serialization);
621 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
622 dbus_connection_set_change_sigpipe(FALSE);
624 /* Open the logging devices, if possible and necessary */
628 /* Make sure we leave a core dump without panicing the
631 install_crash_handler();
633 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
635 if (running_as == MANAGER_INIT)
638 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
639 log_error("Failed to allocate manager object: %s", strerror(-r));
643 if ((r = manager_startup(m, serialization, fds)) < 0)
644 log_error("Failed to fully startup daemon: %s", strerror(-r));
647 /* This will close all file descriptors that were opened, but
648 * not claimed by any unit. */
655 fclose(serialization);
656 serialization = NULL;
658 log_debug("Activating default unit: %s", default_unit);
660 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
661 log_error("Failed to load default target: %s", strerror(-r));
663 log_info("Trying to load rescue target...");
664 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
665 log_error("Failed to load rescue target: %s", strerror(-r));
670 if (action == ACTION_TEST) {
671 printf("-> By units:\n");
672 manager_dump_units(m, stdout, "\t");
675 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
676 log_error("Failed to start default target: %s", strerror(-r));
680 if (action == ACTION_TEST) {
681 printf("-> By jobs:\n");
682 manager_dump_jobs(m, stdout, "\t");
689 if ((r = manager_loop(m)) < 0) {
690 log_error("Failed to run mainloop: %s", strerror(-r));
694 switch (m->exit_code) {
702 if ((r = manager_reload(m)) < 0)
703 log_error("Failed to reload: %s", strerror(-r));
706 case MANAGER_REEXECUTE:
707 if (prepare_reexecute(m, &serialization, &fds) < 0)
711 log_debug("Reexecuting.");
715 assert_not_reached("Unknown exit code.");
728 const char *args[11];
732 assert(serialization);
735 args[i++] = SYSTEMD_BINARY_PATH;
737 args[i++] = "--log-level";
738 args[i++] = log_level_to_string(log_get_max_level());
740 args[i++] = "--log-target";
741 args[i++] = log_target_to_string(log_get_target());
743 args[i++] = "--running-as";
744 args[i++] = manager_running_as_to_string(running_as);
746 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
749 args[i++] = "--deserialize";
753 args[i++] = "--confirm-spawn";
757 assert(i <= ELEMENTSOF(args));
759 execv(args[0], (char* const*) args);
761 log_error("Failed to reexecute: %m");
765 fclose(serialization);