1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 ProFUSION embedded systems
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/>.
23 #include <sys/types.h>
24 #include <sys/reboot.h>
25 #include <linux/reboot.h>
39 #define TIMEOUT_USEC (5 * USEC_PER_SEC)
40 #define FINALIZE_ATTEMPTS 50
42 static bool ignore_proc(pid_t pid) {
46 /* TODO: add more ignore rules here: device-mapper, etc */
51 static bool is_kernel_thread(pid_t pid)
58 snprintf(buf, sizeof(buf), "/proc/%lu/cmdline", (unsigned long)pid);
61 return true; /* not really, but has the desired effect */
63 count = fread(&c, 1, 1, f);
68 static int killall(int sign) {
71 unsigned int n_processes = 0;
73 if ((dir = opendir("/proc")) == NULL)
76 while ((d = readdir(dir))) {
79 if (parse_pid(d->d_name, &pid) < 0)
82 if (is_kernel_thread(pid))
88 if (kill(pid, sign) == 0)
91 log_warning("Could not kill %d: %m", pid);
99 static void wait_for_children(int n_processes, sigset_t *mask) {
104 until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
111 pid_t pid = waitpid(-1, NULL, WNOHANG);
116 if (pid < 0 && errno == ECHILD)
120 if (--n_processes == 0)
124 n = now(CLOCK_MONOTONIC);
128 timespec_store(&ts, until - n);
130 if ((k = sigtimedwait(mask, NULL, &ts)) != SIGCHLD) {
132 if (k < 0 && errno != EAGAIN) {
133 log_error("sigtimedwait() failed: %m");
138 log_warning("sigtimedwait() returned unexpected signal.");
143 static void send_signal(int sign) {
144 sigset_t mask, oldmask;
147 assert_se(sigemptyset(&mask) == 0);
148 assert_se(sigaddset(&mask, SIGCHLD) == 0);
149 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
151 if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
152 log_warning("kill(-1, SIGSTOP) failed: %m");
154 n_processes = killall(sign);
156 if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
157 log_warning("kill(-1, SIGCONT) failed: %m");
159 if (n_processes <= 0)
162 wait_for_children(n_processes, &mask);
165 sigprocmask(SIG_SETMASK, &oldmask, NULL);
168 static void ultimate_send_signal(int sign) {
169 sigset_t mask, oldmask;
172 assert_se(sigemptyset(&mask) == 0);
173 assert_se(sigaddset(&mask, SIGCHLD) == 0);
174 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
176 if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
177 log_warning("kill(-1, SIGSTOP) failed: %m");
180 if (r < 0 && errno != ESRCH)
181 log_warning("kill(-1, %s) failed: %m", signal_to_string(sign));
183 if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
184 log_warning("kill(-1, SIGCONT) failed: %m");
189 wait_for_children(0, &mask);
192 sigprocmask(SIG_SETMASK, &oldmask, NULL);
195 int main(int argc, char *argv[]) {
198 bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
199 bool killed_everbody = false, in_container;
201 log_parse_environment();
202 log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
206 log_error("Not executed by init (pid 1).");
212 log_error("Invalid number of arguments.");
217 in_container = detect_container(NULL) > 0;
219 if (streq(argv[1], "reboot"))
221 else if (streq(argv[1], "poweroff"))
223 else if (streq(argv[1], "halt"))
224 cmd = RB_HALT_SYSTEM;
225 else if (streq(argv[1], "kexec"))
226 cmd = LINUX_REBOOT_CMD_KEXEC;
228 log_error("Unknown action '%s'.", argv[1]);
233 /* lock us into memory */
234 if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
235 log_warning("Cannot lock process memory: %m");
237 log_info("Sending SIGTERM to remaining processes...");
238 send_signal(SIGTERM);
240 log_info("Sending SIGKILL to remaining processes...");
241 send_signal(SIGKILL);
244 need_swapoff = false;
246 /* Unmount all mountpoints, swaps, and loopback devices */
247 for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
248 bool changed = false;
251 log_info("Unmounting file systems.");
252 r = umount_all(&changed);
256 log_info("Not all file systems unmounted, %d left.", r);
258 log_error("Failed to unmount file systems: %s", strerror(-r));
262 log_info("Disabling swaps.");
263 r = swapoff_all(&changed);
265 need_swapoff = false;
267 log_info("Not all swaps are turned off, %d left.", r);
269 log_error("Failed to turn off swaps: %s", strerror(-r));
272 if (need_loop_detach) {
273 log_info("Detaching loop devices.");
274 r = loopback_detach_all(&changed);
276 need_loop_detach = false;
278 log_info("Not all loop devices detached, %d left.", r);
280 log_error("Failed to detach loop devices: %s", strerror(-r));
283 if (need_dm_detach) {
284 log_info("Detaching DM devices.");
285 r = dm_detach_all(&changed);
287 need_dm_detach = false;
289 log_warning("Not all DM devices detached, %d left.", r);
291 log_error("Failed to detach DM devices: %s", strerror(-r));
294 if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach)
298 /* If in this iteration we didn't manage to
299 * unmount/deactivate anything, we either kill more
300 * processes, or simply give up */
303 if (killed_everbody) {
304 /* Hmm, we already killed everybody,
305 * let's just give up */
306 log_error("Cannot finalize remaining file systems and devices, giving up.");
310 log_warning("Cannot finalize remaining file systems and devices, trying to kill remaining processes.");
311 ultimate_send_signal(SIGTERM);
312 ultimate_send_signal(SIGKILL);
313 killed_everbody = true;
316 log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
319 if (retries >= FINALIZE_ATTEMPTS)
320 log_error("Too many iterations, giving up.");
322 execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, NULL);
324 /* If we are in a container, just exit, this will kill our
325 * container for good. */
327 log_error("Exiting container.");
333 if (cmd == LINUX_REBOOT_CMD_KEXEC) {
334 /* We cheat and exec kexec to avoid doing all its work */
338 log_error("Could not fork: %m. Falling back to normal reboot.");
340 wait_for_terminate_and_warn("kexec", pid);
341 log_warning("kexec failed. Falling back to normal reboot.");
344 const char *args[3] = { "/sbin/kexec", "-e", NULL };
345 execv(args[0], (char * const *) args);
353 log_error("Failed to invoke reboot(): %m");
357 log_error("Critical error while doing system shutdown: %s", strerror(-r));