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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "cgroup-util.h" | |
29 | ||
30 | int main(int argc, char*argv[]) { | |
31 | int ret = EXIT_FAILURE; | |
32 | ||
33 | if (argc != 2) { | |
34 | log_error("This program requires one argument."); | |
35 | return EXIT_FAILURE; | |
36 | } | |
37 | ||
38 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); | |
39 | log_parse_environment(); | |
40 | log_open(); | |
41 | ||
4c12626c LP |
42 | umask(0022); |
43 | ||
e9278741 | 44 | if (streq(argv[1], "start")) { |
4a8a5b29 | 45 | int q = 0, r = 0; |
e9278741 | 46 | |
db019b8d KS |
47 | if (unlink("/run/nologin") < 0 && errno != ENOENT) { |
48 | log_error("Failed to remove /run/nologin file: %m"); | |
4a8a5b29 LP |
49 | r = -errno; |
50 | } | |
e9278741 | 51 | |
4a8a5b29 | 52 | if (unlink("/etc/nologin") < 0 && errno != ENOENT) { |
bd118f8e LP |
53 | |
54 | /* If the file doesn't exist and /etc simply | |
55 | * was read-only (in which case unlink() | |
56 | * returns EROFS even if the file doesn't | |
57 | * exist), don't complain */ | |
58 | ||
59 | if (errno != EROFS || access("/etc/nologin", F_OK) >= 0) { | |
60 | log_error("Failed to remove /etc/nologin file: %m"); | |
61 | q = -errno; | |
62 | } | |
e9278741 LP |
63 | } |
64 | ||
4a8a5b29 LP |
65 | if (r < 0 || q < 0) |
66 | goto finish; | |
67 | ||
e9278741 LP |
68 | } else if (streq(argv[1], "stop")) { |
69 | int r, q; | |
1f73f0f1 | 70 | char *cgroup_user_tree = NULL; |
e9278741 | 71 | |
34ca941c | 72 | if ((r = write_one_line_file_atomic("/run/nologin", "System is going down.")) < 0) |
db019b8d | 73 | log_error("Failed to create /run/nologin: %s", strerror(-r)); |
e9278741 | 74 | |
1f73f0f1 LP |
75 | if ((q = cg_get_user_path(&cgroup_user_tree)) < 0) { |
76 | log_error("Failed to determine use path: %s", strerror(-q)); | |
77 | goto finish; | |
78 | } | |
79 | ||
80 | q = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup_user_tree, true); | |
81 | free(cgroup_user_tree); | |
82 | ||
83 | if (q < 0) { | |
e9278741 | 84 | log_error("Failed to kill sessions: %s", strerror(-q)); |
1f73f0f1 LP |
85 | goto finish; |
86 | } | |
e9278741 | 87 | |
1f73f0f1 | 88 | if (r < 0) |
e9278741 LP |
89 | goto finish; |
90 | ||
91 | } else { | |
92 | log_error("Unknown verb %s.", argv[1]); | |
93 | goto finish; | |
94 | } | |
95 | ||
96 | ret = EXIT_SUCCESS; | |
97 | ||
98 | finish: | |
99 | return ret; | |
100 | } |