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 "load-fragment.h"
47 ACTION_DUMP_CONFIGURATION_ITEMS
48 } action = ACTION_RUN;
50 static char *default_unit = NULL;
51 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
53 static bool dump_core = true;
54 static bool crash_shell = false;
55 static int crash_chvt = -1;
56 static bool confirm_spawn = false;
57 static FILE* serialization = NULL;
59 _noreturn static void freeze(void) {
64 static void nop_handler(int sig) {
67 _noreturn static void crash(int sig) {
70 log_error("Caught <%s>, not dumping core.", strsignal(sig));
75 /* We want to wait for the core process, hence let's enable SIGCHLD */
77 sa.sa_handler = nop_handler;
78 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
79 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
81 if ((pid = fork()) < 0)
82 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
87 /* Enable default signal handler for core dump */
89 sa.sa_handler = SIG_DFL;
90 assert_se(sigaction(sig, &sa, NULL) == 0);
92 /* Don't limit the core dump size */
94 rl.rlim_cur = RLIM_INFINITY;
95 rl.rlim_max = RLIM_INFINITY;
96 setrlimit(RLIMIT_CORE, &rl);
98 /* Just to be sure... */
99 assert_se(chdir("/") == 0);
101 /* Raise the signal again */
104 assert_not_reached("We shouldn't be here...");
110 /* Order things nicely. */
111 if ((r = waitpid(pid, &status, 0)) < 0)
112 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
113 else if (!WCOREDUMP(status))
114 log_error("Caught <%s>, core dump failed.", strsignal(sig));
116 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
127 log_info("Executing crash shell in 10s...");
130 /* Let the kernel reap children for us */
132 sa.sa_handler = SIG_IGN;
133 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
134 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
136 if ((pid = fork()) < 0)
137 log_error("Failed to fork off crash shell: %s", strerror(errno));
141 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
142 log_error("Failed to acquire terminal: %s", strerror(-fd));
143 else if ((r = make_stdio(fd)) < 0)
144 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
146 execl("/bin/sh", "/bin/sh", NULL);
148 log_error("execl() failed: %s", strerror(errno));
152 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
155 log_info("Freezing execution.");
159 static void install_crash_handler(void) {
164 sa.sa_handler = crash;
165 sa.sa_flags = SA_NODEFER;
167 assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
168 assert_se(sigaction(SIGILL, &sa, NULL) == 0);
169 assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
170 assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
171 assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
172 assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
175 static int make_null_stdio(void) {
178 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
179 log_error("Failed to open /dev/null: %m");
183 if ((r = make_stdio(null_fd)) < 0)
184 log_warning("Failed to dup2() device: %s", strerror(-r));
189 static int console_setup(bool do_reset) {
192 /* If we are init, we connect stdin/stdout/stderr to /dev/null
193 * and make sure we don't have a controlling tty. */
200 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
201 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
205 if ((r = reset_terminal(tty_fd)) < 0)
206 log_error("Failed to reset /dev/console: %s", strerror(-r));
208 close_nointr_nofail(tty_fd);
212 static int set_default_unit(const char *u) {
217 if (!(c = strdup(u)))
225 static int parse_proc_cmdline_word(const char *word) {
227 static const char * const rlmap[] = {
228 "single", SPECIAL_RUNLEVEL1_TARGET,
229 "-s", SPECIAL_RUNLEVEL1_TARGET,
230 "s", SPECIAL_RUNLEVEL1_TARGET,
231 "S", SPECIAL_RUNLEVEL1_TARGET,
232 "1", SPECIAL_RUNLEVEL1_TARGET,
233 "2", SPECIAL_RUNLEVEL2_TARGET,
234 "3", SPECIAL_RUNLEVEL3_TARGET,
235 "4", SPECIAL_RUNLEVEL4_TARGET,
236 "5", SPECIAL_RUNLEVEL5_TARGET
239 if (startswith(word, "systemd.default="))
240 return set_default_unit(word + 16);
242 else if (startswith(word, "systemd.log_target=")) {
244 if (log_set_target_from_string(word + 19) < 0)
245 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
247 } else if (startswith(word, "systemd.log_level=")) {
249 if (log_set_max_level_from_string(word + 18) < 0)
250 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
252 } else if (startswith(word, "systemd.dump_core=")) {
255 if ((r = parse_boolean(word + 18)) < 0)
256 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
260 } else if (startswith(word, "systemd.crash_shell=")) {
263 if ((r = parse_boolean(word + 20)) < 0)
264 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
269 } else if (startswith(word, "systemd.confirm_spawn=")) {
272 if ((r = parse_boolean(word + 22)) < 0)
273 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
277 } else if (startswith(word, "systemd.crash_chvt=")) {
280 if (safe_atoi(word + 19, &k) < 0)
281 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
285 } else if (startswith(word, "systemd.")) {
287 log_warning("Unknown kernel switch %s. Ignoring.", word);
289 log_info("Supported kernel switches:");
290 log_info("systemd.default=UNIT Default unit to start");
291 log_info("systemd.log_target=console|kmsg|syslog Log target");
292 log_info("systemd.log_level=LEVEL Log level");
293 log_info("systemd.dump_core=0|1 Dump core on crash");
294 log_info("systemd.crash_shell=0|1 On crash run shell");
295 log_info("systemd.crash_chvt=N Change to VT #N on crash");
296 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
301 /* SysV compatibility */
302 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
303 if (streq(word, rlmap[i]))
304 return set_default_unit(rlmap[i+1]);
310 static int parse_proc_cmdline(void) {
317 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
318 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
322 FOREACH_WORD_QUOTED(w, l, line, state) {
325 if (!(word = strndup(w, l))) {
330 r = parse_proc_cmdline_word(word);
344 static int parse_argv(int argc, char *argv[]) {
347 ARG_LOG_LEVEL = 0x100,
352 ARG_DUMP_CONFIGURATION_ITEMS,
357 static const struct option options[] = {
358 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
359 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
360 { "default", required_argument, NULL, ARG_DEFAULT },
361 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
362 { "test", no_argument, NULL, ARG_TEST },
363 { "help", no_argument, NULL, 'h' },
364 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
365 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
366 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
375 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
380 if ((r = log_set_max_level_from_string(optarg)) < 0) {
381 log_error("Failed to parse log level %s.", optarg);
389 if ((r = log_set_target_from_string(optarg)) < 0) {
390 log_error("Failed to parse log target %s.", optarg);
398 if ((r = set_default_unit(optarg)) < 0) {
399 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
405 case ARG_RUNNING_AS: {
408 if ((as = manager_running_as_from_string(optarg)) < 0) {
409 log_error("Failed to parse running as value %s", optarg);
418 action = ACTION_TEST;
421 case ARG_DUMP_CONFIGURATION_ITEMS:
422 action = ACTION_DUMP_CONFIGURATION_ITEMS;
425 case ARG_CONFIRM_SPAWN:
426 confirm_spawn = true;
429 case ARG_DESERIALIZE: {
433 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
434 log_error("Failed to parse deserialize option %s.", optarg);
438 if (!(f = fdopen(fd, "r"))) {
439 log_error("Failed to open serialization fd: %m");
444 fclose(serialization);
452 action = ACTION_HELP;
459 log_error("Unknown option code %c", c);
463 /* PID 1 will get the kernel arguments as parameters, which we
464 * ignore and unconditionally read from
465 * /proc/cmdline. However, we need to ignore those arguments
467 if (running_as != MANAGER_INIT && optind < argc) {
468 log_error("Excess arguments.");
475 static int help(void) {
477 printf("%s [options]\n\n"
478 " -h --help Show this help\n"
479 " --default=UNIT Set default unit\n"
480 " --log-level=LEVEL Set log level\n"
481 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg)\n"
482 " --running-as=AS Set running as (init, system, session)\n"
483 " --test Determine startup sequence, dump it and exit\n"
484 " --dump-configuration-items Dump understood unit configuration items\n"
485 " --confirm-spawn Ask for confirmation when spawning processes\n",
491 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
500 if ((r = manager_open_serialization(&f)) < 0) {
501 log_error("Failed to create serialization faile: %s", strerror(-r));
505 if (!(fds = fdset_new())) {
507 log_error("Failed to allocate fd set: %s", strerror(-r));
511 if ((r = manager_serialize(m, f, fds)) < 0) {
512 log_error("Failed to serialize state: %s", strerror(-r));
516 if (fseeko(f, 0, SEEK_SET) < 0) {
517 log_error("Failed to rewind serialization fd: %m");
521 if ((r = fd_cloexec(fileno(f), false)) < 0) {
522 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
526 if ((r = fdset_cloexec(fds, false)) < 0) {
527 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
545 int main(int argc, char *argv[]) {
551 bool reexecute = false;
554 running_as = MANAGER_INIT;
555 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
557 running_as = MANAGER_SESSION;
559 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
562 /* Mount /proc, /sys and friends, so that /proc/cmdline and
563 * /proc/$PID/fd is available. */
564 if (mount_setup() < 0)
567 /* Reset all signal handlers. */
568 assert_se(reset_all_signal_handlers() == 0);
570 /* If we are init, we can block sigkill. Yay. */
571 ignore_signal(SIGKILL);
572 ignore_signal(SIGPIPE);
574 if (running_as != MANAGER_SESSION)
575 if (parse_proc_cmdline() < 0)
578 log_parse_environment();
580 if (parse_argv(argc, argv) < 0)
583 if (action == ACTION_HELP) {
586 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
587 unit_dump_config_items(stdout);
592 assert_se(action == ACTION_RUN || action == ACTION_TEST);
594 /* Remember open file descriptors for later deserialization */
596 if ((r = fdset_new_fill(&fds)) < 0) {
597 log_error("Failed to allocate fd set: %s", strerror(-r));
601 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
603 close_all_fds(NULL, 0);
605 /* Set up PATH unless it is already set */
607 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
608 running_as == MANAGER_INIT);
610 /* Move out of the way, so that we won't block unmounts */
611 assert_se(chdir("/") == 0);
613 if (running_as != MANAGER_SESSION) {
614 /* Become a session leader if we aren't one yet. */
617 /* Disable the umask logic */
621 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
622 dbus_connection_set_change_sigpipe(FALSE);
624 /* Reset the console, but only if this is really init and we
625 * are freshly booted */
626 if (running_as != MANAGER_SESSION && action == ACTION_RUN) {
627 console_setup(getpid() == 1 && !serialization);
631 /* Open the logging devices, if possible and necessary */
634 /* Make sure we leave a core dump without panicing the
637 install_crash_handler();
639 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
641 if (running_as == MANAGER_INIT) {
646 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
647 log_error("Failed to allocate manager object: %s", strerror(-r));
651 if ((r = manager_startup(m, serialization, fds)) < 0)
652 log_error("Failed to fully start up daemon: %s", strerror(-r));
655 /* This will close all file descriptors that were opened, but
656 * not claimed by any unit. */
663 fclose(serialization);
664 serialization = NULL;
666 log_debug("Activating default unit: %s", default_unit);
668 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
669 log_error("Failed to load default target: %s", strerror(-r));
671 log_info("Trying to load rescue target...");
672 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
673 log_error("Failed to load rescue target: %s", strerror(-r));
678 if (action == ACTION_TEST) {
679 printf("-> By units:\n");
680 manager_dump_units(m, stdout, "\t");
683 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
684 log_error("Failed to start default target: %s", strerror(-r));
688 if (action == ACTION_TEST) {
689 printf("-> By jobs:\n");
690 manager_dump_jobs(m, stdout, "\t");
697 if ((r = manager_loop(m)) < 0) {
698 log_error("Failed to run mainloop: %s", strerror(-r));
702 switch (m->exit_code) {
710 if ((r = manager_reload(m)) < 0)
711 log_error("Failed to reload: %s", strerror(-r));
714 case MANAGER_REEXECUTE:
715 if (prepare_reexecute(m, &serialization, &fds) < 0)
719 log_debug("Reexecuting.");
723 assert_not_reached("Unknown exit code.");
736 const char *args[11];
740 assert(serialization);
743 args[i++] = SYSTEMD_BINARY_PATH;
745 args[i++] = "--log-level";
746 args[i++] = log_level_to_string(log_get_max_level());
748 args[i++] = "--log-target";
749 args[i++] = log_target_to_string(log_get_target());
751 args[i++] = "--running-as";
752 args[i++] = manager_running_as_to_string(running_as);
754 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
757 args[i++] = "--deserialize";
761 args[i++] = "--confirm-spawn";
765 assert(i <= ELEMENTSOF(args));
767 execv(args[0], (char* const*) args);
769 log_error("Failed to reexecute: %m");
773 fclose(serialization);