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)) < 0) {
142 log_error("Failed to acquire terminal: %s", strerror(-fd));
146 if (dup2(fd, STDIN_FILENO) < 0 ||
147 dup2(fd, STDOUT_FILENO) < 0 ||
148 dup2(fd, STDERR_FILENO) < 0) {
149 log_error("Failed to duplicate terminal fd: %s", strerror(errno));
154 close_nointr_nofail(fd);
156 execl("/bin/sh", "/bin/sh", NULL);
158 log_error("execl() failed: %s", strerror(errno));
162 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
165 log_info("Freezing execution.");
169 static void install_crash_handler(void) {
174 sa.sa_handler = crash;
175 sa.sa_flags = SA_NODEFER;
177 assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
178 assert_se(sigaction(SIGILL, &sa, NULL) == 0);
179 assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
180 assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
181 assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
182 assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
185 static int console_setup(bool do_reset) {
186 int tty_fd = -1, null_fd = -1, r = 0;
188 /* If we are init, we connect stdout/stderr to /dev/console
189 * and stdin to /dev/null and make sure we don't have a
190 * controlling tty. */
194 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY)) < 0) {
195 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
200 if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
201 log_error("Failed to open /dev/null: %m");
207 assert(null_fd >= 3);
210 if (reset_terminal(tty_fd) < 0)
211 log_error("Failed to reset /dev/console: %m");
213 if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
214 dup2(tty_fd, STDERR_FILENO) < 0 ||
215 dup2(null_fd, STDIN_FILENO) < 0) {
216 log_error("Failed to dup2() device: %m");
225 close_nointr_nofail(tty_fd);
228 close_nointr_nofail(null_fd);
233 static int set_default_unit(const char *u) {
238 if (!(c = strdup(u)))
246 static int parse_proc_cmdline_word(const char *word) {
248 static const char * const rlmap[] = {
249 "single", SPECIAL_RUNLEVEL1_TARGET,
250 "-s", SPECIAL_RUNLEVEL1_TARGET,
251 "s", SPECIAL_RUNLEVEL1_TARGET,
252 "S", SPECIAL_RUNLEVEL1_TARGET,
253 "1", SPECIAL_RUNLEVEL1_TARGET,
254 "2", SPECIAL_RUNLEVEL2_TARGET,
255 "3", SPECIAL_RUNLEVEL3_TARGET,
256 "4", SPECIAL_RUNLEVEL4_TARGET,
257 "5", SPECIAL_RUNLEVEL5_TARGET
260 if (startswith(word, "systemd.default="))
261 return set_default_unit(word + 16);
263 else if (startswith(word, "systemd.log_target=")) {
265 if (log_set_target_from_string(word + 19) < 0)
266 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
268 } else if (startswith(word, "systemd.log_level=")) {
270 if (log_set_max_level_from_string(word + 18) < 0)
271 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
273 } else if (startswith(word, "systemd.dump_core=")) {
276 if ((r = parse_boolean(word + 18)) < 0)
277 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
281 } else if (startswith(word, "systemd.crash_shell=")) {
284 if ((r = parse_boolean(word + 20)) < 0)
285 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
290 } else if (startswith(word, "systemd.confirm_spawn=")) {
293 if ((r = parse_boolean(word + 22)) < 0)
294 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
298 } else if (startswith(word, "systemd.crash_chvt=")) {
301 if (safe_atoi(word + 19, &k) < 0)
302 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
306 } else if (startswith(word, "systemd.")) {
308 log_warning("Unknown kernel switch %s. Ignoring.", word);
310 log_info("Supported kernel switches:");
311 log_info("systemd.default=UNIT Default unit to start");
312 log_info("systemd.log_target=console|kmsg|syslog Log target");
313 log_info("systemd.log_level=LEVEL Log level");
314 log_info("systemd.dump_core=0|1 Dump core on crash");
315 log_info("systemd.crash_shell=0|1 On crash run shell");
316 log_info("systemd.crash_chvt=N Change to VT #N on crash");
317 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
322 /* SysV compatibility */
323 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
324 if (streq(word, rlmap[i]))
325 return set_default_unit(rlmap[i+1]);
331 static int parse_proc_cmdline(void) {
338 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
339 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
343 FOREACH_WORD_QUOTED(w, l, line, state) {
346 if (!(word = strndup(w, l))) {
351 r = parse_proc_cmdline_word(word);
365 static int parse_argv(int argc, char *argv[]) {
368 ARG_LOG_LEVEL = 0x100,
373 ARG_DUMP_CONFIGURATION_ITEMS,
378 static const struct option options[] = {
379 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
380 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
381 { "default", required_argument, NULL, ARG_DEFAULT },
382 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
383 { "test", no_argument, NULL, ARG_TEST },
384 { "help", no_argument, NULL, 'h' },
385 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
386 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
387 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
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);
419 if ((r = set_default_unit(optarg)) < 0) {
420 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
426 case ARG_RUNNING_AS: {
429 if ((as = manager_running_as_from_string(optarg)) < 0) {
430 log_error("Failed to parse running as value %s", optarg);
439 action = ACTION_TEST;
442 case ARG_DUMP_CONFIGURATION_ITEMS:
443 action = ACTION_DUMP_CONFIGURATION_ITEMS;
446 case ARG_CONFIRM_SPAWN:
447 confirm_spawn = true;
450 case ARG_DESERIALIZE: {
454 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
455 log_error("Failed to parse deserialize option %s.", optarg);
459 if (!(f = fdopen(fd, "r"))) {
460 log_error("Failed to open serialization fd: %m");
465 fclose(serialization);
473 action = ACTION_HELP;
480 log_error("Unknown option code %c", c);
484 /* PID 1 will get the kernel arguments as parameters, which we
485 * ignore and unconditionally read from
486 * /proc/cmdline. However, we need to ignore those arguments
488 if (running_as != MANAGER_INIT && optind < argc) {
489 log_error("Excess arguments.");
496 static int help(void) {
498 printf("%s [options]\n\n"
499 " -h --help Show this help\n"
500 " --default=UNIT Set default unit\n"
501 " --log-level=LEVEL Set log level\n"
502 " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
503 " --running-as=AS Set running as (init, system, session)\n"
504 " --test Determine startup sequence, dump it and exit\n"
505 " --dump-configuration-items Dump understood unit configuration items\n"
506 " --confirm-spawn Ask for confirmation when spawning processes\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 else if (getuid() == 0)
577 running_as = MANAGER_SYSTEM;
579 running_as = MANAGER_SESSION;
581 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
584 /* Mount /proc, /sys and friends, so that /proc/cmdline and
585 * /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_signal(SIGKILL);
594 ignore_signal(SIGPIPE);
596 if (running_as != MANAGER_SESSION)
597 if (parse_proc_cmdline() < 0)
600 log_parse_environment();
602 if (parse_argv(argc, argv) < 0)
605 if (action == ACTION_HELP) {
608 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
609 unit_dump_config_items(stdout);
614 assert_se(action == ACTION_RUN || action == ACTION_TEST);
616 /* Remember open file descriptors for later deserialization */
618 if ((r = fdset_new_fill(&fds)) < 0) {
619 log_error("Failed to allocate fd set: %s", strerror(-r));
623 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
625 close_all_fds(NULL, 0);
627 /* Set up PATH unless it is already set */
629 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
630 running_as == MANAGER_INIT);
632 /* Move out of the way, so that we won't block unmounts */
633 assert_se(chdir("/") == 0);
635 if (running_as != MANAGER_SESSION) {
636 /* Become a session leader if we aren't one yet. */
639 /* Disable the umask logic */
643 /* Reset the console, but only if this is really init and we
644 * are freshly booted */
645 if (running_as == MANAGER_INIT && action == ACTION_RUN)
646 console_setup(getpid() == 1 && !serialization);
648 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
649 dbus_connection_set_change_sigpipe(FALSE);
651 /* Open the logging devices, if possible and necessary */
655 /* Make sure we leave a core dump without panicing the
658 install_crash_handler();
660 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
662 if (running_as == MANAGER_INIT) {
667 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
668 log_error("Failed to allocate manager object: %s", strerror(-r));
672 if ((r = manager_startup(m, serialization, fds)) < 0)
673 log_error("Failed to fully start up daemon: %s", strerror(-r));
676 /* This will close all file descriptors that were opened, but
677 * not claimed by any unit. */
684 fclose(serialization);
685 serialization = NULL;
687 log_debug("Activating default unit: %s", default_unit);
689 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
690 log_error("Failed to load default target: %s", strerror(-r));
692 log_info("Trying to load rescue target...");
693 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
694 log_error("Failed to load rescue target: %s", strerror(-r));
699 if (action == ACTION_TEST) {
700 printf("-> By units:\n");
701 manager_dump_units(m, stdout, "\t");
704 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
705 log_error("Failed to start default target: %s", strerror(-r));
709 if (action == ACTION_TEST) {
710 printf("-> By jobs:\n");
711 manager_dump_jobs(m, stdout, "\t");
718 if ((r = manager_loop(m)) < 0) {
719 log_error("Failed to run mainloop: %s", strerror(-r));
723 switch (m->exit_code) {
731 if ((r = manager_reload(m)) < 0)
732 log_error("Failed to reload: %s", strerror(-r));
735 case MANAGER_REEXECUTE:
736 if (prepare_reexecute(m, &serialization, &fds) < 0)
740 log_debug("Reexecuting.");
744 assert_not_reached("Unknown exit code.");
757 const char *args[11];
761 assert(serialization);
764 args[i++] = SYSTEMD_BINARY_PATH;
766 args[i++] = "--log-level";
767 args[i++] = log_level_to_string(log_get_max_level());
769 args[i++] = "--log-target";
770 args[i++] = log_target_to_string(log_get_target());
772 args[i++] = "--running-as";
773 args[i++] = manager_running_as_to_string(running_as);
775 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
778 args[i++] = "--deserialize";
782 args[i++] = "--confirm-spawn";
786 assert(i <= ELEMENTSOF(args));
788 execv(args[0], (char* const*) args);
790 log_error("Failed to reexecute: %m");
794 fclose(serialization);