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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2012 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "sd-bus.h" | |
28 | ||
29 | #include "alloc-util.h" | |
30 | #include "bus-error.h" | |
31 | #include "bus-util.h" | |
32 | #include "fd-util.h" | |
33 | #include "format-util.h" | |
34 | #include "process-util.h" | |
35 | #include "signal-util.h" | |
36 | #include "strv.h" | |
37 | #include "user-util.h" | |
38 | #include "util.h" | |
39 | ||
40 | static const char* arg_what = "idle:sleep:shutdown"; | |
41 | static const char* arg_who = NULL; | |
42 | static const char* arg_why = "Unknown reason"; | |
43 | static const char* arg_mode = NULL; | |
44 | ||
45 | static enum { | |
46 | ACTION_INHIBIT, | |
47 | ACTION_LIST | |
48 | } arg_action = ACTION_INHIBIT; | |
49 | ||
50 | static int inhibit(sd_bus *bus, sd_bus_error *error) { | |
51 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
52 | int r; | |
53 | int fd; | |
54 | ||
55 | r = sd_bus_call_method( | |
56 | bus, | |
57 | "org.freedesktop.login1", | |
58 | "/org/freedesktop/login1", | |
59 | "org.freedesktop.login1.Manager", | |
60 | "Inhibit", | |
61 | error, | |
62 | &reply, | |
63 | "ssss", arg_what, arg_who, arg_why, arg_mode); | |
64 | if (r < 0) | |
65 | return r; | |
66 | ||
67 | r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd); | |
68 | if (r < 0) | |
69 | return r; | |
70 | ||
71 | r = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
72 | if (r < 0) | |
73 | return -errno; | |
74 | ||
75 | return r; | |
76 | } | |
77 | ||
78 | static int print_inhibitors(sd_bus *bus, sd_bus_error *error) { | |
79 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
80 | const char *what, *who, *why, *mode; | |
81 | unsigned int uid, pid; | |
82 | unsigned n = 0; | |
83 | int r; | |
84 | ||
85 | r = sd_bus_call_method( | |
86 | bus, | |
87 | "org.freedesktop.login1", | |
88 | "/org/freedesktop/login1", | |
89 | "org.freedesktop.login1.Manager", | |
90 | "ListInhibitors", | |
91 | error, | |
92 | &reply, | |
93 | ""); | |
94 | if (r < 0) | |
95 | return r; | |
96 | ||
97 | r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)"); | |
98 | if (r < 0) | |
99 | return bus_log_parse_error(r); | |
100 | ||
101 | while ((r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid)) > 0) { | |
102 | _cleanup_free_ char *comm = NULL, *u = NULL; | |
103 | ||
104 | if (arg_mode && !streq(mode, arg_mode)) | |
105 | continue; | |
106 | ||
107 | get_process_comm(pid, &comm); | |
108 | u = uid_to_name(uid); | |
109 | ||
110 | printf(" Who: %s (UID "UID_FMT"/%s, PID "PID_FMT"/%s)\n" | |
111 | " What: %s\n" | |
112 | " Why: %s\n" | |
113 | " Mode: %s\n\n", | |
114 | who, uid, strna(u), pid, strna(comm), | |
115 | what, | |
116 | why, | |
117 | mode); | |
118 | ||
119 | n++; | |
120 | } | |
121 | if (r < 0) | |
122 | return bus_log_parse_error(r); | |
123 | ||
124 | r = sd_bus_message_exit_container(reply); | |
125 | if (r < 0) | |
126 | return bus_log_parse_error(r); | |
127 | ||
128 | printf("%u inhibitors listed.\n", n); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static void help(void) { | |
133 | printf("%s [OPTIONS...] {COMMAND} ...\n\n" | |
134 | "Execute a process while inhibiting shutdown/sleep/idle.\n\n" | |
135 | " -h --help Show this help\n" | |
136 | " --version Show package version\n" | |
137 | " --what=WHAT Operations to inhibit, colon separated list of:\n" | |
138 | " shutdown, sleep, idle, handle-power-key,\n" | |
139 | " handle-suspend-key, handle-hibernate-key,\n" | |
140 | " handle-lid-switch\n" | |
141 | " --who=STRING A descriptive string who is inhibiting\n" | |
142 | " --why=STRING A descriptive string why is being inhibited\n" | |
143 | " --mode=MODE One of block or delay\n" | |
144 | " --list List active inhibitors\n" | |
145 | , program_invocation_short_name); | |
146 | } | |
147 | ||
148 | static int parse_argv(int argc, char *argv[]) { | |
149 | ||
150 | enum { | |
151 | ARG_VERSION = 0x100, | |
152 | ARG_WHAT, | |
153 | ARG_WHO, | |
154 | ARG_WHY, | |
155 | ARG_MODE, | |
156 | ARG_LIST, | |
157 | }; | |
158 | ||
159 | static const struct option options[] = { | |
160 | { "help", no_argument, NULL, 'h' }, | |
161 | { "version", no_argument, NULL, ARG_VERSION }, | |
162 | { "what", required_argument, NULL, ARG_WHAT }, | |
163 | { "who", required_argument, NULL, ARG_WHO }, | |
164 | { "why", required_argument, NULL, ARG_WHY }, | |
165 | { "mode", required_argument, NULL, ARG_MODE }, | |
166 | { "list", no_argument, NULL, ARG_LIST }, | |
167 | {} | |
168 | }; | |
169 | ||
170 | int c; | |
171 | ||
172 | assert(argc >= 0); | |
173 | assert(argv); | |
174 | ||
175 | while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0) | |
176 | ||
177 | switch (c) { | |
178 | ||
179 | case 'h': | |
180 | help(); | |
181 | return 0; | |
182 | ||
183 | case ARG_VERSION: | |
184 | return version(); | |
185 | ||
186 | case ARG_WHAT: | |
187 | arg_what = optarg; | |
188 | break; | |
189 | ||
190 | case ARG_WHO: | |
191 | arg_who = optarg; | |
192 | break; | |
193 | ||
194 | case ARG_WHY: | |
195 | arg_why = optarg; | |
196 | break; | |
197 | ||
198 | case ARG_MODE: | |
199 | arg_mode = optarg; | |
200 | break; | |
201 | ||
202 | case ARG_LIST: | |
203 | arg_action = ACTION_LIST; | |
204 | break; | |
205 | ||
206 | case '?': | |
207 | return -EINVAL; | |
208 | ||
209 | default: | |
210 | assert_not_reached("Unhandled option"); | |
211 | } | |
212 | ||
213 | if (arg_action == ACTION_INHIBIT && optind == argc) | |
214 | arg_action = ACTION_LIST; | |
215 | ||
216 | else if (arg_action == ACTION_INHIBIT && optind >= argc) { | |
217 | log_error("Missing command line to execute."); | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | return 1; | |
222 | } | |
223 | ||
224 | int main(int argc, char *argv[]) { | |
225 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
226 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
227 | int r; | |
228 | ||
229 | log_parse_environment(); | |
230 | log_open(); | |
231 | ||
232 | r = parse_argv(argc, argv); | |
233 | if (r < 0) | |
234 | return EXIT_FAILURE; | |
235 | if (r == 0) | |
236 | return EXIT_SUCCESS; | |
237 | ||
238 | r = sd_bus_default_system(&bus); | |
239 | if (r < 0) { | |
240 | log_error_errno(r, "Failed to connect to bus: %m"); | |
241 | return EXIT_FAILURE; | |
242 | } | |
243 | ||
244 | if (arg_action == ACTION_LIST) { | |
245 | ||
246 | r = print_inhibitors(bus, &error); | |
247 | if (r < 0) { | |
248 | log_error("Failed to list inhibitors: %s", bus_error_message(&error, -r)); | |
249 | return EXIT_FAILURE; | |
250 | } | |
251 | ||
252 | } else { | |
253 | _cleanup_close_ int fd = -1; | |
254 | _cleanup_free_ char *w = NULL; | |
255 | pid_t pid; | |
256 | ||
257 | if (!arg_who) | |
258 | arg_who = w = strv_join(argv + optind, " "); | |
259 | ||
260 | if (!arg_mode) | |
261 | arg_mode = "block"; | |
262 | ||
263 | fd = inhibit(bus, &error); | |
264 | if (fd < 0) { | |
265 | log_error("Failed to inhibit: %s", bus_error_message(&error, fd)); | |
266 | return EXIT_FAILURE; | |
267 | } | |
268 | ||
269 | r = safe_fork("(inhibit)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_LOG, &pid); | |
270 | if (r < 0) | |
271 | return EXIT_FAILURE; | |
272 | if (r == 0) { | |
273 | /* Child */ | |
274 | execvp(argv[optind], argv + optind); | |
275 | log_error_errno(errno, "Failed to execute %s: %m", argv[optind]); | |
276 | _exit(EXIT_FAILURE); | |
277 | } | |
278 | ||
279 | r = wait_for_terminate_and_check(argv[optind], pid, WAIT_LOG); | |
280 | return r < 0 ? EXIT_FAILURE : r; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } |