102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "log.h"
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#include "util.h"
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#include "cgroup-util.h"
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int main(int argc, char*argv[]) {
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int ret = EXIT_FAILURE;
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if (argc != 2) {
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log_error("This program requires one argument.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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if (streq(argv[1], "start")) {
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int q = 0, r = 0;
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if (unlink("/run/nologin") < 0 && errno != ENOENT) {
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log_error("Failed to remove /run/nologin file: %m");
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r = -errno;
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}
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if (unlink("/etc/nologin") < 0 && errno != ENOENT) {
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/* If the file doesn't exist and /etc simply
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* was read-only (in which case unlink()
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* returns EROFS even if the file doesn't
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* exist), don't complain */
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if (errno != EROFS || access("/etc/nologin", F_OK) >= 0) {
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log_error("Failed to remove /etc/nologin file: %m");
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q = -errno;
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}
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}
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if (r < 0 || q < 0)
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goto finish;
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} else if (streq(argv[1], "stop")) {
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int r, q;
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char *cgroup_user_tree = NULL;
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r = write_one_line_file_atomic("/run/nologin", "System is going down.");
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if (r < 0)
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log_error("Failed to create /run/nologin: %s", strerror(-r));
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q = cg_get_user_path(&cgroup_user_tree);
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if (q < 0) {
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log_error("Failed to determine use path: %s", strerror(-q));
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goto finish;
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}
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q = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup_user_tree, true);
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free(cgroup_user_tree);
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if (q < 0) {
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log_error("Failed to kill sessions: %s", strerror(-q));
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goto finish;
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}
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if (r < 0)
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goto finish;
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} else {
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log_error("Unknown verb %s.", argv[1]);
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goto finish;
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}
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ret = EXIT_SUCCESS;
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finish:
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return ret;
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}
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