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1 | /*** | |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2012 Lennart Poettering | |
5 | Copyright 2013 Zbigniew Jędrzejewski-Szmek | |
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 <errno.h> | |
22 | #include <getopt.h> | |
23 | #include <stdio.h> | |
24 | ||
25 | #include "sd-messages.h" | |
26 | ||
27 | #include "def.h" | |
28 | #include "exec-util.h" | |
29 | #include "fd-util.h" | |
30 | #include "fileio.h" | |
31 | #include "log.h" | |
32 | #include "sleep-config.h" | |
33 | #include "string-util.h" | |
34 | #include "strv.h" | |
35 | #include "util.h" | |
36 | ||
37 | static char* arg_verb = NULL; | |
38 | ||
39 | static int write_mode(char **modes) { | |
40 | int r = 0; | |
41 | char **mode; | |
42 | ||
43 | STRV_FOREACH(mode, modes) { | |
44 | int k; | |
45 | ||
46 | k = write_string_file("/sys/power/disk", *mode, 0); | |
47 | if (k == 0) | |
48 | return 0; | |
49 | ||
50 | log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", | |
51 | *mode); | |
52 | if (r == 0) | |
53 | r = k; | |
54 | } | |
55 | ||
56 | if (r < 0) | |
57 | log_error_errno(r, "Failed to write mode to /sys/power/disk: %m"); | |
58 | ||
59 | return r; | |
60 | } | |
61 | ||
62 | static int write_state(FILE **f, char **states) { | |
63 | char **state; | |
64 | int r = 0; | |
65 | ||
66 | STRV_FOREACH(state, states) { | |
67 | int k; | |
68 | ||
69 | k = write_string_stream(*f, *state, 0); | |
70 | if (k == 0) | |
71 | return 0; | |
72 | log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", | |
73 | *state); | |
74 | if (r == 0) | |
75 | r = k; | |
76 | ||
77 | fclose(*f); | |
78 | *f = fopen("/sys/power/state", "we"); | |
79 | if (!*f) | |
80 | return log_error_errno(errno, "Failed to open /sys/power/state: %m"); | |
81 | } | |
82 | ||
83 | return r; | |
84 | } | |
85 | ||
86 | static int execute(char **modes, char **states) { | |
87 | ||
88 | char *arguments[] = { | |
89 | NULL, | |
90 | (char*) "pre", | |
91 | arg_verb, | |
92 | NULL | |
93 | }; | |
94 | static const char* const dirs[] = { | |
95 | SYSTEM_SLEEP_PATH, | |
96 | NULL | |
97 | }; | |
98 | ||
99 | int r; | |
100 | _cleanup_fclose_ FILE *f = NULL; | |
101 | ||
102 | /* This file is opened first, so that if we hit an error, | |
103 | * we can abort before modifying any state. */ | |
104 | f = fopen("/sys/power/state", "we"); | |
105 | if (!f) | |
106 | return log_error_errno(errno, "Failed to open /sys/power/state: %m"); | |
107 | ||
108 | /* Configure the hibernation mode */ | |
109 | r = write_mode(modes); | |
110 | if (r < 0) | |
111 | return r; | |
112 | ||
113 | execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments); | |
114 | ||
115 | log_struct(LOG_INFO, | |
116 | "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR, | |
117 | LOG_MESSAGE("Suspending system..."), | |
118 | "SLEEP=%s", arg_verb, | |
119 | NULL); | |
120 | ||
121 | r = write_state(&f, states); | |
122 | if (r < 0) | |
123 | return r; | |
124 | ||
125 | log_struct(LOG_INFO, | |
126 | "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR, | |
127 | LOG_MESSAGE("System resumed."), | |
128 | "SLEEP=%s", arg_verb, | |
129 | NULL); | |
130 | ||
131 | arguments[1] = (char*) "post"; | |
132 | execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments); | |
133 | ||
134 | return r; | |
135 | } | |
136 | ||
137 | static void help(void) { | |
138 | printf("%s COMMAND\n\n" | |
139 | "Suspend the system, hibernate the system, or both.\n\n" | |
140 | "Commands:\n" | |
141 | " -h --help Show this help and exit\n" | |
142 | " --version Print version string and exit\n" | |
143 | " suspend Suspend the system\n" | |
144 | " hibernate Hibernate the system\n" | |
145 | " hybrid-sleep Both hibernate and suspend the system\n" | |
146 | , program_invocation_short_name); | |
147 | } | |
148 | ||
149 | static int parse_argv(int argc, char *argv[]) { | |
150 | enum { | |
151 | ARG_VERSION = 0x100, | |
152 | }; | |
153 | ||
154 | static const struct option options[] = { | |
155 | { "help", no_argument, NULL, 'h' }, | |
156 | { "version", no_argument, NULL, ARG_VERSION }, | |
157 | {} | |
158 | }; | |
159 | ||
160 | int c; | |
161 | ||
162 | assert(argc >= 0); | |
163 | assert(argv); | |
164 | ||
165 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) | |
166 | switch(c) { | |
167 | case 'h': | |
168 | help(); | |
169 | return 0; /* done */ | |
170 | ||
171 | case ARG_VERSION: | |
172 | return version(); | |
173 | ||
174 | case '?': | |
175 | return -EINVAL; | |
176 | ||
177 | default: | |
178 | assert_not_reached("Unhandled option"); | |
179 | } | |
180 | ||
181 | if (argc - optind != 1) { | |
182 | log_error("Usage: %s COMMAND", | |
183 | program_invocation_short_name); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | arg_verb = argv[optind]; | |
188 | ||
189 | if (!streq(arg_verb, "suspend") && | |
190 | !streq(arg_verb, "hibernate") && | |
191 | !streq(arg_verb, "hybrid-sleep")) { | |
192 | log_error("Unknown command '%s'.", arg_verb); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | return 1 /* work to do */; | |
197 | } | |
198 | ||
199 | int main(int argc, char *argv[]) { | |
200 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
201 | int r; | |
202 | ||
203 | log_set_target(LOG_TARGET_AUTO); | |
204 | log_parse_environment(); | |
205 | log_open(); | |
206 | ||
207 | r = parse_argv(argc, argv); | |
208 | if (r <= 0) | |
209 | goto finish; | |
210 | ||
211 | r = parse_sleep_config(arg_verb, &modes, &states); | |
212 | if (r < 0) | |
213 | goto finish; | |
214 | ||
215 | r = execute(modes, states); | |
216 | ||
217 | finish: | |
218 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
219 | } |