1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/>.
28 #include "cgroup-util.h"
30 int main(int argc, char*argv[]) {
31 int ret = EXIT_FAILURE;
34 log_error("This program requires one argument.");
38 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
39 log_parse_environment();
42 if (streq(argv[1], "start")) {
45 if (unlink("/run/nologin") < 0 && errno != ENOENT) {
46 log_error("Failed to remove /run/nologin file: %m");
50 if (unlink("/etc/nologin") < 0 && errno != ENOENT) {
52 /* If the file doesn't exist and /etc simply
53 * was read-only (in which case unlink()
54 * returns EROFS even if the file doesn't
55 * exist), don't complain */
57 if (errno != EROFS || access("/etc/nologin", F_OK) >= 0) {
58 log_error("Failed to remove /etc/nologin file: %m");
66 } else if (streq(argv[1], "stop")) {
68 char *cgroup_user_tree = NULL;
70 if ((r = write_one_line_file("/run/nologin", "System is going down.")) < 0)
71 log_error("Failed to create /run/nologin: %s", strerror(-r));
73 if ((q = cg_get_user_path(&cgroup_user_tree)) < 0) {
74 log_error("Failed to determine use path: %s", strerror(-q));
78 q = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup_user_tree, true);
79 free(cgroup_user_tree);
82 log_error("Failed to kill sessions: %s", strerror(-q));
90 log_error("Unknown verb %s.", argv[1]);