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(void) {
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);
191 if (reset_terminal(tty_fd) < 0)
192 log_error("Failed to reset /dev/console: %m");
194 if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
195 dup2(tty_fd, STDERR_FILENO) < 0 ||
196 dup2(null_fd, STDIN_FILENO) < 0) {
197 log_error("Failed to dup2() device: %m");
206 close_nointr_nofail(tty_fd);
209 close_nointr_nofail(null_fd);
214 static int set_default_unit(const char *u) {
219 if (!(c = strdup(u)))
227 static int parse_proc_cmdline_word(const char *word) {
229 static const char * const rlmap[] = {
230 "single", SPECIAL_RUNLEVEL1_TARGET,
231 "-s", SPECIAL_RUNLEVEL1_TARGET,
232 "s", SPECIAL_RUNLEVEL1_TARGET,
233 "S", SPECIAL_RUNLEVEL1_TARGET,
234 "1", SPECIAL_RUNLEVEL1_TARGET,
235 "2", SPECIAL_RUNLEVEL2_TARGET,
236 "3", SPECIAL_RUNLEVEL3_TARGET,
237 "4", SPECIAL_RUNLEVEL4_TARGET,
238 "5", SPECIAL_RUNLEVEL5_TARGET
241 if (startswith(word, "systemd.default="))
242 return set_default_unit(word + 16);
244 else if (startswith(word, "systemd.log_target=")) {
246 if (log_set_target_from_string(word + 19) < 0)
247 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
249 } else if (startswith(word, "systemd.log_level=")) {
251 if (log_set_max_level_from_string(word + 18) < 0)
252 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
254 } else if (startswith(word, "systemd.dump_core=")) {
257 if ((r = parse_boolean(word + 18)) < 0)
258 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
262 } else if (startswith(word, "systemd.crash_shell=")) {
265 if ((r = parse_boolean(word + 20)) < 0)
266 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
271 } else if (startswith(word, "systemd.confirm_spawn=")) {
274 if ((r = parse_boolean(word + 22)) < 0)
275 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
279 } else if (startswith(word, "systemd.crash_chvt=")) {
282 if (safe_atoi(word + 19, &k) < 0)
283 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
287 } else if (startswith(word, "systemd.")) {
289 log_warning("Unknown kernel switch %s. Ignoring.", word);
291 log_info("Supported kernel switches:");
292 log_info("systemd.default=UNIT Default unit to start");
293 log_info("systemd.log_target=console|kmsg|syslog Log target");
294 log_info("systemd.log_level=LEVEL Log level");
295 log_info("systemd.dump_core=0|1 Dump core on crash");
296 log_info("systemd.crash_shell=0|1 On crash run shell");
297 log_info("systemd.crash_chvt=N Change to VT #N on crash");
298 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
303 /* SysV compatibility */
304 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
305 if (streq(word, rlmap[i]))
306 return set_default_unit(rlmap[i+1]);
312 static int parse_proc_cmdline(void) {
319 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
320 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
324 FOREACH_WORD_QUOTED(w, l, line, state) {
327 if (!(word = strndup(w, l))) {
332 r = parse_proc_cmdline_word(word);
346 static int parse_argv(int argc, char *argv[]) {
349 ARG_LOG_LEVEL = 0x100,
354 ARG_DUMP_CONFIGURATION_ITEMS,
359 static const struct option options[] = {
360 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
361 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
362 { "default", required_argument, NULL, ARG_DEFAULT },
363 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
364 { "test", no_argument, NULL, ARG_TEST },
365 { "help", no_argument, NULL, 'h' },
366 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
367 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
368 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
377 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
382 if ((r = log_set_max_level_from_string(optarg)) < 0) {
383 log_error("Failed to parse log level %s.", optarg);
391 if ((r = log_set_target_from_string(optarg)) < 0) {
392 log_error("Failed to parse log target %s.", optarg);
400 if ((r = set_default_unit(optarg)) < 0) {
401 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
407 case ARG_RUNNING_AS: {
410 if ((as = manager_running_as_from_string(optarg)) < 0) {
411 log_error("Failed to parse running as value %s", optarg);
420 action = ACTION_TEST;
423 case ARG_DUMP_CONFIGURATION_ITEMS:
424 action = ACTION_DUMP_CONFIGURATION_ITEMS;
427 case ARG_CONFIRM_SPAWN:
428 confirm_spawn = true;
431 case ARG_DESERIALIZE: {
435 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
436 log_error("Failed to parse deserialize option %s.", optarg);
440 if (!(f = fdopen(fd, "r"))) {
441 log_error("Failed to open serialization fd: %m");
446 fclose(serialization);
454 action = ACTION_HELP;
461 log_error("Unknown option code %c", c);
468 static int help(void) {
470 printf("%s [options]\n\n"
471 " -h --help Show this help\n"
472 " --default=UNIT Set default unit\n"
473 " --log-level=LEVEL Set log level\n"
474 " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
475 " --running-as=AS Set running as (init, system, session)\n"
476 " --test Determine startup sequence, dump it and exit\n"
477 " --dump-configuration-items Dump understood unit configuration items\n"
478 " --confirm-spawn Ask for confirmation when spawning processes\n",
484 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
493 if ((r = manager_open_serialization(&f)) < 0) {
494 log_error("Failed to create serialization faile: %s", strerror(-r));
498 if (!(fds = fdset_new())) {
500 log_error("Failed to allocate fd set: %s", strerror(-r));
504 if ((r = manager_serialize(m, f, fds)) < 0) {
505 log_error("Failed to serialize state: %s", strerror(-r));
509 if (fseeko(f, 0, SEEK_SET) < 0) {
510 log_error("Failed to rewind serialization fd: %m");
514 if ((r = fd_cloexec(fileno(f), false)) < 0) {
515 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
519 if ((r = fdset_cloexec(fds, false)) < 0) {
520 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
538 int main(int argc, char *argv[]) {
544 bool reexecute = false;
547 running_as = MANAGER_INIT;
548 else if (getuid() == 0)
549 running_as = MANAGER_SYSTEM;
551 running_as = MANAGER_SESSION;
553 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
556 /* Mount /proc, /sys and friends, so that /proc/cmdline and
557 * /proc/$PID/fd is available. */
558 if (mount_setup() < 0)
561 /* Reset all signal handlers. */
562 assert_se(reset_all_signal_handlers() == 0);
564 /* If we are init, we can block sigkill. Yay. */
565 ignore_signal(SIGKILL);
566 ignore_signal(SIGPIPE);
568 if (running_as != MANAGER_SESSION)
569 if (parse_proc_cmdline() < 0)
572 log_parse_environment();
574 if (parse_argv(argc, argv) < 0)
577 if (action == ACTION_HELP) {
580 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
581 unit_dump_config_items(stdout);
586 assert_se(action == ACTION_RUN || action == ACTION_TEST);
588 /* Remember open file descriptors for later deserialization */
590 if ((r = fdset_new_fill(&fds)) < 0) {
591 log_error("Failed to allocate fd set: %s", strerror(-r));
595 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
597 close_all_fds(NULL, 0);
599 /* Set up PATH unless it is already set */
601 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
602 running_as == MANAGER_INIT);
604 /* Move out of the way, so that we won't block unmounts */
605 assert_se(chdir("/") == 0);
607 if (running_as != MANAGER_SESSION) {
608 /* Become a session leader if we aren't one yet. */
611 /* Disable the umask logic */
615 if (running_as == MANAGER_INIT)
618 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
619 dbus_connection_set_change_sigpipe(FALSE);
621 /* Open the logging devices, if possible and necessary */
625 /* Make sure we leave a core dump without panicing the
628 install_crash_handler();
630 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
632 if (running_as == MANAGER_INIT)
635 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
636 log_error("Failed to allocate manager object: %s", strerror(-r));
640 if ((r = manager_startup(m, serialization, fds)) < 0)
641 log_error("Failed to fully startup daemon: %s", strerror(-r));
644 /* This will close all file descriptors that were opened, but
645 * not claimed by any unit. */
652 fclose(serialization);
653 serialization = NULL;
655 log_debug("Activating default unit: %s", default_unit);
657 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
658 log_error("Failed to load default target: %s", strerror(-r));
660 log_info("Trying to load rescue target...");
661 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
662 log_error("Failed to load rescue target: %s", strerror(-r));
667 if (action == ACTION_TEST) {
668 printf("→ By units:\n");
669 manager_dump_units(m, stdout, "\t");
672 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
673 log_error("Failed to start default target: %s", strerror(-r));
677 if (action == ACTION_TEST) {
678 printf("→ By jobs:\n");
679 manager_dump_jobs(m, stdout, "\t");
686 if ((r = manager_loop(m)) < 0) {
687 log_error("Failed to run mainloop: %s", strerror(-r));
691 switch (m->exit_code) {
699 if ((r = manager_reload(m)) < 0)
700 log_error("Failed to reload: %s", strerror(-r));
703 case MANAGER_REEXECUTE:
704 if (prepare_reexecute(m, &serialization, &fds) < 0)
708 log_debug("Reexecuting.");
712 assert_not_reached("Unknown exit code.");
725 const char *args[11];
729 assert(serialization);
732 args[i++] = SYSTEMD_BINARY_PATH;
734 args[i++] = "--log-level";
735 args[i++] = log_level_to_string(log_get_max_level());
737 args[i++] = "--log-target";
738 args[i++] = log_target_to_string(log_get_target());
740 args[i++] = "--running-as";
741 args[i++] = manager_running_as_to_string(running_as);
743 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
746 args[i++] = "--deserialize";
750 args[i++] = "--confirm-spawn";
754 assert(i <= ELEMENTSOF(args));
756 execv(args[0], (char* const*) args);
758 log_error("Failed to reexecute: %m");
762 fclose(serialization);