chiark / gitweb /
sd-dhcp-server: remove unused cleanup function
[elogind.git] / src / sleep / sleep.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2012 Lennart Poettering
7   Copyright 2013 Zbigniew JÄ™drzejewski-Szmek
8
9   systemd is free software; you can redistribute it and/or modify it
10   under the terms of the GNU Lesser General Public License as published by
11   the Free Software Foundation; either version 2.1 of the License, or
12   (at your option) any later version.
13
14   systemd is distributed in the hope that it will be useful, but
15   WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17   Lesser General Public License for more details.
18
19   You should have received a copy of the GNU Lesser General Public License
20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
21 ***/
22
23 #include <stdio.h>
24 #include <errno.h>
25 #include <string.h>
26 #include <getopt.h>
27
28 #include "sd-id128.h"
29 #include "sd-messages.h"
30 #include "log.h"
31 #include "util.h"
32 #include "strv.h"
33 #include "fileio.h"
34 #include "build.h"
35 #include "sleep-config.h"
36 #include "def.h"
37
38 static char* arg_verb = NULL;
39
40 static int write_mode(char **modes) {
41         int r = 0;
42         char **mode;
43
44         STRV_FOREACH(mode, modes) {
45                 int k;
46
47                 k = write_string_file("/sys/power/disk", *mode);
48                 if (k == 0)
49                         return 0;
50
51                 log_debug("Failed to write '%s' to /sys/power/disk: %s",
52                           *mode, strerror(-k));
53                 if (r == 0)
54                         r = k;
55         }
56
57         if (r < 0)
58                 log_error("Failed to write mode to /sys/power/disk: %s",
59                           strerror(-r));
60
61         return r;
62 }
63
64 static int write_state(FILE **f, char **states) {
65         char **state;
66         int r = 0;
67
68         STRV_FOREACH(state, states) {
69                 int k;
70
71                 k = write_string_to_file(*f, *state);
72                 if (k == 0)
73                         return 0;
74                 log_debug("Failed to write '%s' to /sys/power/state: %s",
75                           *state, strerror(-k));
76                 if (r == 0)
77                         r = k;
78
79                 fclose(*f);
80                 *f = fopen("/sys/power/state", "we");
81                 if (!*f) {
82                         log_error("Failed to open /sys/power/state: %m");
83                         return -errno;
84                 }
85         }
86
87         return r;
88 }
89
90 static int execute(char **modes, char **states) {
91         char* arguments[4];
92         int r;
93         _cleanup_fclose_ FILE *f = NULL;
94         const char* note = strappenda("SLEEP=", arg_verb);
95
96         /* This file is opened first, so that if we hit an error,
97          * we can abort before modifying any state. */
98         f = fopen("/sys/power/state", "we");
99         if (!f) {
100                 log_error("Failed to open /sys/power/state: %m");
101                 return -errno;
102         }
103
104         /* Configure the hibernation mode */
105         r = write_mode(modes);
106         if (r < 0)
107                 return r;
108
109         arguments[0] = NULL;
110         arguments[1] = (char*) "pre";
111         arguments[2] = arg_verb;
112         arguments[3] = NULL;
113         execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
114
115         log_struct(LOG_INFO,
116                    MESSAGE_ID(SD_MESSAGE_SLEEP_START),
117                    "MESSAGE=Suspending system...",
118                    note,
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),
127                    "MESSAGE=System resumed.",
128                    note,
129                    NULL);
130
131         arguments[1] = (char*) "post";
132         execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
133
134         return r;
135 }
136
137 static int help(void) {
138
139         printf("%s COMMAND\n\n"
140                "Suspend the system, hibernate the system, or both.\n\n"
141                "Commands:\n"
142                "  -h --help            Show this help and exit\n"
143                "  --version            Print version string and exit\n"
144                "  suspend              Suspend the system\n"
145                "  hibernate            Hibernate the system\n"
146                "  hybrid-sleep         Both hibernate and suspend the system\n"
147                , program_invocation_short_name
148                );
149
150         return 0;
151 }
152
153 static int parse_argv(int argc, char *argv[]) {
154         enum {
155                 ARG_VERSION = 0x100,
156         };
157
158         static const struct option options[] = {
159                 { "help",         no_argument,       NULL, 'h'           },
160                 { "version",      no_argument,       NULL, ARG_VERSION   },
161                 {}
162         };
163
164         int c;
165
166         assert(argc >= 0);
167         assert(argv);
168
169         while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
170                 switch(c) {
171                 case 'h':
172                         return help();
173
174                 case ARG_VERSION:
175                         puts(PACKAGE_STRING);
176                         puts(SYSTEMD_FEATURES);
177                         return 0 /* done */;
178
179                 case '?':
180                         return -EINVAL;
181
182                 default:
183                         assert_not_reached("Unhandled option");
184                 }
185
186         if (argc - optind != 1) {
187                 log_error("Usage: %s COMMAND",
188                           program_invocation_short_name);
189                 return -EINVAL;
190         }
191
192         arg_verb = argv[optind];
193
194         if (!streq(arg_verb, "suspend") &&
195             !streq(arg_verb, "hibernate") &&
196             !streq(arg_verb, "hybrid-sleep")) {
197                 log_error("Unknown command '%s'.", arg_verb);
198                 return -EINVAL;
199         }
200
201         return 1 /* work to do */;
202 }
203
204 int main(int argc, char *argv[]) {
205         _cleanup_strv_free_ char **modes = NULL, **states = NULL;
206         int r;
207
208         log_set_target(LOG_TARGET_AUTO);
209         log_parse_environment();
210         log_open();
211
212         r = parse_argv(argc, argv);
213         if (r <= 0)
214                 goto finish;
215
216         r = parse_sleep_config(arg_verb, &modes, &states);
217         if (r < 0)
218                 goto finish;
219
220         r = execute(modes, states);
221
222 finish:
223         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
224 }