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"
45 ACTION_DUMP_CONFIGURATION_ITEMS
46 } action = ACTION_RUN;
48 static char *default_unit = NULL;
49 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
51 static bool dump_core = true;
52 static bool crash_shell = false;
53 static int crash_chvt = -1;
55 static bool confirm_spawn = false;
57 _noreturn static void freeze(void) {
62 static void nop_handler(int sig) {
65 _noreturn static void crash(int sig) {
68 log_error("Caught <%s>, not dumping core.", strsignal(sig));
73 /* We want to wait for the core process, hence let's enable SIGCHLD */
75 sa.sa_handler = nop_handler;
76 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
77 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
79 if ((pid = fork()) < 0)
80 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
85 /* Enable default signal handler for core dump */
87 sa.sa_handler = SIG_DFL;
88 assert_se(sigaction(sig, &sa, NULL) == 0);
90 /* Don't limit the core dump size */
92 rl.rlim_cur = RLIM_INFINITY;
93 rl.rlim_max = RLIM_INFINITY;
94 setrlimit(RLIMIT_CORE, &rl);
96 /* Just to be sure... */
97 assert_se(chdir("/") == 0);
99 /* Raise the signal again */
102 assert_not_reached("We shouldn't be here...");
108 /* Order things nicely. */
109 if ((r = waitpid(pid, &status, 0)) < 0)
110 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
111 else if (!WCOREDUMP(status))
112 log_error("Caught <%s>, core dump failed.", strsignal(sig));
114 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
125 log_info("Executing crash shell in 10s...");
128 /* Let the kernel reap children for us */
130 sa.sa_handler = SIG_IGN;
131 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
132 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
134 if ((pid = fork()) < 0)
135 log_error("Failed to fork off crash shell: %s", strerror(errno));
137 execl("/bin/sh", "/bin/sh", NULL);
139 log_error("execl() failed: %s", strerror(errno));
143 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
146 log_info("Freezing execution.");
150 static void install_crash_handler(void) {
155 sa.sa_handler = crash;
156 sa.sa_flags = SA_NODEFER;
158 assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
159 assert_se(sigaction(SIGILL, &sa, NULL) == 0);
160 assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
161 assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
162 assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
163 assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
166 static int console_setup(void) {
167 int tty_fd = -1, null_fd = -1, r = 0;
169 /* If we are init, we connect stdout/stderr to /dev/console
170 * and stdin to /dev/null and make sure we don't have a
171 * controlling tty. */
175 if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
176 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
181 if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
182 log_error("Failed to open /dev/null: %m");
188 assert(null_fd >= 3);
190 if (reset_terminal(tty_fd) < 0)
191 log_error("Failed to reset /dev/console: %m");
193 if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
194 dup2(tty_fd, STDERR_FILENO) < 0 ||
195 dup2(null_fd, STDIN_FILENO) < 0) {
196 log_error("Failed to dup2() device: %m");
205 close_nointr(tty_fd);
208 close_nointr(null_fd);
213 static int set_default_unit(const char *u) {
218 if (!(c = strdup(u)))
226 static int parse_proc_cmdline_word(const char *word) {
228 static const char * const rlmap[] = {
229 "single", SPECIAL_RUNLEVEL1_TARGET,
230 "-s", SPECIAL_RUNLEVEL1_TARGET,
231 "s", SPECIAL_RUNLEVEL1_TARGET,
232 "S", SPECIAL_RUNLEVEL1_TARGET,
233 "1", SPECIAL_RUNLEVEL1_TARGET,
234 "2", SPECIAL_RUNLEVEL2_TARGET,
235 "3", SPECIAL_RUNLEVEL3_TARGET,
236 "4", SPECIAL_RUNLEVEL4_TARGET,
237 "5", SPECIAL_RUNLEVEL5_TARGET
240 if (startswith(word, "systemd.default="))
241 return set_default_unit(word + 16);
243 else if (startswith(word, "systemd.log_target=")) {
245 if (log_set_target_from_string(word + 19) < 0)
246 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
248 } else if (startswith(word, "systemd.log_level=")) {
250 if (log_set_max_level_from_string(word + 18) < 0)
251 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
253 } else if (startswith(word, "systemd.dump_core=")) {
256 if ((r = parse_boolean(word + 18)) < 0)
257 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
261 } else if (startswith(word, "systemd.crash_shell=")) {
264 if ((r = parse_boolean(word + 20)) < 0)
265 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
270 } else if (startswith(word, "systemd.confirm_spawn=")) {
273 if ((r = parse_boolean(word + 22)) < 0)
274 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
278 } else if (startswith(word, "systemd.crash_chvt=")) {
281 if (safe_atoi(word + 19, &k) < 0)
282 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
286 } else if (startswith(word, "systemd.")) {
288 log_warning("Unknown kernel switch %s. Ignoring.", word);
290 log_info("Supported kernel switches:");
291 log_info("systemd.default=UNIT Default unit to start");
292 log_info("systemd.log_target=console|kmsg|syslog Log target");
293 log_info("systemd.log_level=LEVEL Log level");
294 log_info("systemd.dump_core=0|1 Dump core on crash");
295 log_info("systemd.crash_shell=0|1 On crash run shell");
296 log_info("systemd.crash_chvt=N Change to VT #N on crash");
297 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
302 /* SysV compatibility */
303 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
304 if (streq(word, rlmap[i]))
305 return set_default_unit(rlmap[i+1]);
311 static int parse_proc_cmdline(void) {
318 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
319 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
323 FOREACH_WORD_QUOTED(w, l, line, state) {
326 if (!(word = strndup(w, l))) {
331 r = parse_proc_cmdline_word(word);
345 static int parse_argv(int argc, char *argv[]) {
348 ARG_LOG_LEVEL = 0x100,
353 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 },
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;
429 action = ACTION_HELP;
436 log_error("Unknown option code %c", c);
443 static int help(void) {
445 printf("%s [options]\n\n"
446 " -h --help Show this help\n"
447 " --default=UNIT Set default unit\n"
448 " --log-level=LEVEL Set log level\n"
449 " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
450 " --running-as=AS Set running as (init, system, session)\n"
451 " --test Determine startup sequence, dump it and exit\n"
452 " --dump-configuration-items Dump understood unit configuration items\n"
453 " --confirm-spawn Ask for confirmation when spawning processes\n",
459 int main(int argc, char *argv[]) {
466 running_as = MANAGER_INIT;
467 else if (getuid() == 0)
468 running_as = MANAGER_SYSTEM;
470 running_as = MANAGER_SESSION;
472 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
475 /* Mount /proc, /sys and friends, so that /proc/cmdline and
476 * /proc/$PID/fd is available. */
477 if (mount_setup() < 0)
480 /* Reset all signal handlers. */
481 assert_se(reset_all_signal_handlers() == 0);
483 /* If we are init, we can block sigkill. Yay. */
484 ignore_signal(SIGKILL);
485 ignore_signal(SIGPIPE);
487 /* Close all open files */
488 assert_se(close_all_fds(NULL, 0) == 0);
490 if (running_as != MANAGER_SESSION)
491 if (parse_proc_cmdline() < 0)
494 log_parse_environment();
496 if (parse_argv(argc, argv) < 0)
499 if (action == ACTION_HELP) {
502 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
503 unit_dump_config_items(stdout);
508 assert_se(action == ACTION_RUN || action == ACTION_TEST);
510 /* Set up PATH unless it is already set */
512 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
513 running_as == MANAGER_INIT);
515 /* Move out of the way, so that we won't block unmounts */
516 assert_se(chdir("/") == 0);
518 if (running_as != MANAGER_SESSION) {
519 /* Become a session leader if we aren't one yet. */
522 /* Disable the umask logic */
526 if (running_as == MANAGER_INIT)
529 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
530 dbus_connection_set_change_sigpipe(FALSE);
532 /* Open the logging devices, if possible and necessary */
536 /* Make sure we leave a core dump without panicing the
539 install_crash_handler();
541 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
543 if (running_as == MANAGER_INIT)
546 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
547 log_error("Failed to allocate manager object: %s", strerror(-r));
551 if ((r = manager_coldplug(m)) < 0) {
552 log_error("Failed to retrieve coldplug information: %s", strerror(-r));
556 log_debug("Activating default unit: %s", default_unit);
558 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
559 log_error("Failed to load default target: %s", strerror(-r));
561 log_info("Trying to load rescue target...");
562 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
563 log_error("Failed to load rescue target: %s", strerror(-r));
568 if (action == ACTION_TEST) {
569 printf("→ By units:\n");
570 manager_dump_units(m, stdout, "\t");
573 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
574 log_error("Failed to start default target: %s", strerror(-r));
578 if (action == ACTION_TEST) {
579 printf("→ By jobs:\n");
580 manager_dump_jobs(m, stdout, "\t");
589 if ((r = manager_loop(m)) < 0) {
590 log_error("Failed to run mainloop: %s", strerror(-r));