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