2 This file is part of systemd.
4 Copyright 2010 ProFUSION embedded systems
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <linux/reboot.h>
27 #include <sys/mount.h>
28 #include <sys/reboot.h>
32 #include "alloc-util.h"
33 #include "cgroup-util.h"
39 #include "parse-util.h"
40 #include "process-util.h"
41 #include "string-util.h"
42 #include "switch-root.h"
43 #include "terminal-util.h"
49 #define FINALIZE_ATTEMPTS 50
51 static char* arg_verb
;
52 static uint8_t arg_exit_code
;
54 static int parse_argv(int argc
, char *argv
[]) {
56 ARG_LOG_LEVEL
= 0x100,
63 static const struct option options
[] = {
64 { "log-level", required_argument
, NULL
, ARG_LOG_LEVEL
},
65 { "log-target", required_argument
, NULL
, ARG_LOG_TARGET
},
66 { "log-color", optional_argument
, NULL
, ARG_LOG_COLOR
},
67 { "log-location", optional_argument
, NULL
, ARG_LOG_LOCATION
},
68 { "exit-code", required_argument
, NULL
, ARG_EXIT_CODE
},
77 /* "-" prevents getopt from permuting argv[] and moving the verb away
78 * from argv[1]. Our interface to initrd promises it'll be there. */
79 while ((c
= getopt_long(argc
, argv
, "-", options
, NULL
)) >= 0)
83 r
= log_set_max_level_from_string(optarg
);
85 log_error("Failed to parse log level %s, ignoring.", optarg
);
90 r
= log_set_target_from_string(optarg
);
92 log_error("Failed to parse log target %s, ignoring", optarg
);
99 r
= log_show_color_from_string(optarg
);
101 log_error("Failed to parse log color setting %s, ignoring", optarg
);
103 log_show_color(true);
107 case ARG_LOG_LOCATION
:
109 r
= log_show_location_from_string(optarg
);
111 log_error("Failed to parse log location setting %s, ignoring", optarg
);
113 log_show_location(true);
118 r
= safe_atou8(optarg
, &arg_exit_code
);
120 log_error("Failed to parse exit code %s, ignoring", optarg
);
128 log_error("Excess arguments, ignoring");
135 assert_not_reached("Unhandled option code.");
139 log_error("Verb argument missing.");
146 static int switch_root_initramfs(void) {
147 if (mount("/run/initramfs", "/run/initramfs", NULL
, MS_BIND
, NULL
) < 0)
148 return log_error_errno(errno
, "Failed to mount bind /run/initramfs on /run/initramfs: %m");
150 if (mount(NULL
, "/run/initramfs", NULL
, MS_PRIVATE
, NULL
) < 0)
151 return log_error_errno(errno
, "Failed to make /run/initramfs private mount: %m");
153 /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors.
154 * /run/initramfs/shutdown will take care of these.
155 * Also do not detach the old root, because /run/initramfs/shutdown needs to access it.
157 return switch_root("/run/initramfs", "/oldroot", false, MS_BIND
);
160 int main(int argc
, char *argv
[]) {
161 bool need_umount
, need_swapoff
, need_loop_detach
, need_dm_detach
;
162 bool in_container
, use_watchdog
= false;
163 _cleanup_free_
char *cgroup
= NULL
;
167 static const char* const dirs
[] = {SYSTEM_SHUTDOWN_PATH
, NULL
};
169 log_parse_environment();
170 r
= parse_argv(argc
, argv
);
174 /* journald will die if not gone yet. The log target defaults
175 * to console, but may have been changed by command line options. */
177 log_close_console(); /* force reopen of /dev/console */
183 log_error("Not executed by init (PID 1).");
188 if (streq(arg_verb
, "reboot"))
190 else if (streq(arg_verb
, "poweroff"))
192 else if (streq(arg_verb
, "halt"))
193 cmd
= RB_HALT_SYSTEM
;
194 else if (streq(arg_verb
, "kexec"))
195 cmd
= LINUX_REBOOT_CMD_KEXEC
;
196 else if (streq(arg_verb
, "exit"))
197 cmd
= 0; /* ignored, just checking that arg_verb is valid */
200 log_error("Unknown action '%s'.", arg_verb
);
204 (void) cg_get_root_path(&cgroup
);
205 in_container
= detect_container() > 0;
207 use_watchdog
= !!getenv("WATCHDOG_USEC");
209 /* Lock us into memory */
210 mlockall(MCL_CURRENT
|MCL_FUTURE
);
212 /* Synchronize everything that is not written to disk yet at this point already. This is a good idea so that
213 * slow IO is processed here already and the final process killing spree is not impacted by processes
214 * desperately trying to sync IO to disk within their timeout. */
218 log_info("Sending SIGTERM to remaining processes...");
219 broadcast_signal(SIGTERM
, true, true);
221 log_info("Sending SIGKILL to remaining processes...");
222 broadcast_signal(SIGKILL
, true, false);
224 need_umount
= !in_container
;
225 need_swapoff
= !in_container
;
226 need_loop_detach
= !in_container
;
227 need_dm_detach
= !in_container
;
229 /* Unmount all mountpoints, swaps, and loopback devices */
230 for (retries
= 0; retries
< FINALIZE_ATTEMPTS
; retries
++) {
231 bool changed
= false;
236 /* Let's trim the cgroup tree on each iteration so
237 that we leave an empty cgroup tree around, so that
238 container managers get a nice notify event when we
241 cg_trim(SYSTEMD_CGROUP_CONTROLLER
, cgroup
, false);
244 log_info("Unmounting file systems.");
245 r
= umount_all(&changed
);
248 log_info("All filesystems unmounted.");
250 log_info("Not all file systems unmounted, %d left.", r
);
252 log_error_errno(r
, "Failed to unmount file systems: %m");
256 log_info("Deactivating swaps.");
257 r
= swapoff_all(&changed
);
259 need_swapoff
= false;
260 log_info("All swaps deactivated.");
262 log_info("Not all swaps deactivated, %d left.", r
);
264 log_error_errno(r
, "Failed to deactivate swaps: %m");
267 if (need_loop_detach
) {
268 log_info("Detaching loop devices.");
269 r
= loopback_detach_all(&changed
);
271 need_loop_detach
= false;
272 log_info("All loop devices detached.");
274 log_info("Not all loop devices detached, %d left.", r
);
276 log_error_errno(r
, "Failed to detach loop devices: %m");
279 if (need_dm_detach
) {
280 log_info("Detaching DM devices.");
281 r
= dm_detach_all(&changed
);
283 need_dm_detach
= false;
284 log_info("All DM devices detached.");
286 log_info("Not all DM devices detached, %d left.", r
);
288 log_error_errno(r
, "Failed to detach DM devices: %m");
291 if (!need_umount
&& !need_swapoff
&& !need_loop_detach
&& !need_dm_detach
) {
293 log_info("All filesystems, swaps, loop devices, DM devices detached.");
298 /* If in this iteration we didn't manage to
299 * unmount/deactivate anything, we simply give up */
301 log_info("Cannot finalize remaining%s%s%s%s continuing.",
302 need_umount
? " file systems," : "",
303 need_swapoff
? " swap devices," : "",
304 need_loop_detach
? " loop devices," : "",
305 need_dm_detach
? " DM devices," : "");
309 log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
311 need_umount
? " file systems," : "",
312 need_swapoff
? " swap devices," : "",
313 need_loop_detach
? " loop devices," : "",
314 need_dm_detach
? " DM devices," : "");
317 log_error("Too many iterations, giving up.");
322 arguments
[1] = arg_verb
;
324 execute_directories(dirs
, DEFAULT_TIMEOUT_USEC
, arguments
);
326 if (!in_container
&& !in_initrd() &&
327 access("/run/initramfs/shutdown", X_OK
) == 0) {
328 r
= switch_root_initramfs();
330 argv
[0] = (char*) "/shutdown";
333 make_console_stdio();
335 log_info("Successfully changed into root pivot.\n"
336 "Returning to initrd...");
338 execv("/shutdown", argv
);
339 log_error_errno(errno
, "Failed to execute shutdown binary: %m");
341 log_error_errno(r
, "Failed to switch root to \"/run/initramfs\": %m");
345 if (need_umount
|| need_swapoff
|| need_loop_detach
|| need_dm_detach
)
346 log_error("Failed to finalize %s%s%s%s ignoring",
347 need_umount
? " file systems," : "",
348 need_swapoff
? " swap devices," : "",
349 need_loop_detach
? " loop devices," : "",
350 need_dm_detach
? " DM devices," : "");
352 /* The kernel will automatically flush ATA disks and suchlike on reboot(), but the file systems need to be
353 * sync'ed explicitly in advance. So let's do this here, but not needlessly slow down containers. Note that we
354 * sync'ed things already once above, but we did some more work since then which might have caused IO, hence
355 * let's doit once more. */
359 if (streq(arg_verb
, "exit")) {
363 /* We cannot exit() on the host, fallback on another
371 case LINUX_REBOOT_CMD_KEXEC
:
374 /* We cheat and exec kexec to avoid doing all its work */
377 log_info("Rebooting with kexec.");
381 log_error_errno(errno
, "Failed to fork: %m");
384 const char * const args
[] = {
390 execv(args
[0], (char * const *) args
);
393 wait_for_terminate_and_warn("kexec", pid
, true);
402 _cleanup_free_
char *param
= NULL
;
404 r
= read_one_line_file("/run/systemd/reboot-param", ¶m
);
406 log_warning_errno(r
, "Failed to read reboot parameter file: %m");
408 if (!isempty(param
)) {
409 log_info("Rebooting with argument '%s'.", param
);
410 syscall(SYS_reboot
, LINUX_REBOOT_MAGIC1
, LINUX_REBOOT_MAGIC2
, LINUX_REBOOT_CMD_RESTART2
, param
);
411 log_warning_errno(errno
, "Failed to reboot with parameter, retrying without: %m");
415 log_info("Rebooting.");
419 log_info("Powering off.");
423 log_info("Halting system.");
427 assert_not_reached("Unknown magic");
431 if (errno
== EPERM
&& in_container
) {
432 /* If we are in a container, and we lacked
433 * CAP_SYS_BOOT just exit, this will kill our
434 * container for good. */
435 log_info("Exiting container.");
439 r
= log_error_errno(errno
, "Failed to invoke reboot(): %m");
442 log_emergency_errno(r
, "Critical error while doing system shutdown: %m");