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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 2013 Zbigniew Jędrzejewski-Szmek
7 :
8 : systemd is free software; you can redistribute it and/or modify it
9 : under the terms of the GNU Lesser General Public License as published by
10 : the Free Software Foundation; either version 2.1 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 : Lesser General Public License for more details.
17 :
18 : You should have received a copy of the GNU Lesser General Public License
19 : along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 : ***/
21 :
22 : #include <stdio.h>
23 :
24 : #include "conf-parser.h"
25 : #include "sleep-config.h"
26 : #include "fileio.h"
27 : #include "log.h"
28 : #include "strv.h"
29 : #include "util.h"
30 :
31 : #define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0)
32 :
33 3 : int parse_sleep_config(const char *verb, char ***_modes, char ***_states) {
34 :
35 : _cleanup_strv_free_ char
36 6 : **suspend_mode = NULL, **suspend_state = NULL,
37 6 : **hibernate_mode = NULL, **hibernate_state = NULL,
38 6 : **hybrid_mode = NULL, **hybrid_state = NULL;
39 : char **modes, **states;
40 :
41 3 : const ConfigTableItem items[] = {
42 : { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
43 : { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
44 : { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
45 : { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
46 : { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
47 : { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
48 : {}
49 : };
50 :
51 3 : config_parse_many(PKGSYSCONFDIR "/sleep.conf",
52 : CONF_DIRS_NULSTR("systemd/sleep.conf"),
53 : "Sleep\0", config_item_table_lookup, items,
54 : false, NULL);
55 :
56 3 : if (streq(verb, "suspend")) {
57 : /* empty by default */
58 1 : USE(modes, suspend_mode);
59 :
60 1 : if (suspend_state)
61 0 : USE(states, suspend_state);
62 : else
63 1 : states = strv_new("mem", "standby", "freeze", NULL);
64 :
65 2 : } else if (streq(verb, "hibernate")) {
66 1 : if (hibernate_mode)
67 0 : USE(modes, hibernate_mode);
68 : else
69 1 : modes = strv_new("platform", "shutdown", NULL);
70 :
71 1 : if (hibernate_state)
72 0 : USE(states, hibernate_state);
73 : else
74 1 : states = strv_new("disk", NULL);
75 :
76 1 : } else if (streq(verb, "hybrid-sleep")) {
77 1 : if (hybrid_mode)
78 0 : USE(modes, hybrid_mode);
79 : else
80 1 : modes = strv_new("suspend", "platform", "shutdown", NULL);
81 :
82 1 : if (hybrid_state)
83 0 : USE(states, hybrid_state);
84 : else
85 1 : states = strv_new("disk", NULL);
86 :
87 : } else
88 0 : assert_not_reached("what verb");
89 :
90 3 : if ((!modes && !streq(verb, "suspend")) || !states) {
91 0 : strv_free(modes);
92 0 : strv_free(states);
93 0 : return log_oom();
94 : }
95 :
96 3 : *_modes = modes;
97 3 : *_states = states;
98 3 : return 0;
99 : }
100 :
101 7 : int can_sleep_state(char **types) {
102 : char **type;
103 : int r;
104 14 : _cleanup_free_ char *p = NULL;
105 :
106 7 : if (strv_isempty(types))
107 0 : return true;
108 :
109 : /* If /sys is read-only we cannot sleep */
110 7 : if (access("/sys/power/state", W_OK) < 0)
111 7 : return false;
112 :
113 0 : r = read_one_line_file("/sys/power/state", &p);
114 0 : if (r < 0)
115 0 : return false;
116 :
117 0 : STRV_FOREACH(type, types) {
118 : const char *word, *state;
119 : size_t l, k;
120 :
121 0 : k = strlen(*type);
122 0 : FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
123 0 : if (l == k && memcmp(word, *type, l) == 0)
124 0 : return true;
125 : }
126 :
127 0 : return false;
128 : }
129 :
130 4 : int can_sleep_disk(char **types) {
131 : char **type;
132 : int r;
133 8 : _cleanup_free_ char *p = NULL;
134 :
135 4 : if (strv_isempty(types))
136 0 : return true;
137 :
138 : /* If /sys is read-only we cannot sleep */
139 4 : if (access("/sys/power/disk", W_OK) < 0)
140 4 : return false;
141 :
142 0 : r = read_one_line_file("/sys/power/disk", &p);
143 0 : if (r < 0)
144 0 : return false;
145 :
146 0 : STRV_FOREACH(type, types) {
147 : const char *word, *state;
148 : size_t l, k;
149 :
150 0 : k = strlen(*type);
151 0 : FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
152 0 : if (l == k && memcmp(word, *type, l) == 0)
153 0 : return true;
154 :
155 0 : if (l == k + 2 &&
156 0 : word[0] == '[' &&
157 0 : memcmp(word + 1, *type, l - 2) == 0 &&
158 0 : word[l-1] == ']')
159 0 : return true;
160 : }
161 : }
162 :
163 0 : return false;
164 : }
165 :
166 : #define HIBERNATION_SWAP_THRESHOLD 0.98
167 :
168 0 : static int hibernation_partition_size(size_t *size, size_t *used) {
169 0 : _cleanup_fclose_ FILE *f;
170 : unsigned i;
171 :
172 0 : assert(size);
173 0 : assert(used);
174 :
175 0 : f = fopen("/proc/swaps", "re");
176 0 : if (!f) {
177 0 : log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
178 : "Failed to retrieve open /proc/swaps: %m");
179 0 : assert(errno > 0);
180 0 : return -errno;
181 : }
182 :
183 0 : (void) fscanf(f, "%*s %*s %*s %*s %*s\n");
184 :
185 0 : for (i = 1;; i++) {
186 0 : _cleanup_free_ char *dev = NULL, *type = NULL;
187 : size_t size_field, used_field;
188 : int k;
189 :
190 0 : k = fscanf(f,
191 : "%ms " /* device/file */
192 : "%ms " /* type of swap */
193 : "%zu " /* swap size */
194 : "%zu " /* used */
195 : "%*i\n", /* priority */
196 : &dev, &type, &size_field, &used_field);
197 0 : if (k != 4) {
198 0 : if (k == EOF)
199 0 : break;
200 :
201 0 : log_warning("Failed to parse /proc/swaps:%u", i);
202 0 : continue;
203 : }
204 :
205 0 : if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
206 0 : log_warning("Ignoring deleted swapfile '%s'.", dev);
207 0 : continue;
208 : }
209 :
210 0 : *size = size_field;
211 0 : *used = used_field;
212 0 : return 0;
213 0 : }
214 :
215 0 : log_debug("No swap partitions were found.");
216 0 : return -ENOSYS;
217 : }
218 :
219 0 : static bool enough_memory_for_hibernation(void) {
220 0 : _cleanup_free_ char *active = NULL;
221 0 : unsigned long long act = 0;
222 0 : size_t size = 0, used = 0;
223 : int r;
224 :
225 0 : r = hibernation_partition_size(&size, &used);
226 0 : if (r < 0)
227 0 : return false;
228 :
229 0 : r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
230 0 : if (r < 0) {
231 0 : log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
232 0 : return false;
233 : }
234 :
235 0 : r = safe_atollu(active, &act);
236 0 : if (r < 0) {
237 0 : log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
238 : active);
239 0 : return false;
240 : }
241 :
242 0 : r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
243 0 : log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
244 : r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
245 :
246 0 : return r;
247 : }
248 :
249 3 : int can_sleep(const char *verb) {
250 6 : _cleanup_strv_free_ char **modes = NULL, **states = NULL;
251 : int r;
252 :
253 3 : assert(streq(verb, "suspend") ||
254 : streq(verb, "hibernate") ||
255 : streq(verb, "hybrid-sleep"));
256 :
257 3 : r = parse_sleep_config(verb, &modes, &states);
258 3 : if (r < 0)
259 0 : return false;
260 :
261 3 : if (!can_sleep_state(states) || !can_sleep_disk(modes))
262 3 : return false;
263 :
264 0 : return streq(verb, "suspend") || enough_memory_for_hibernation();
265 : }
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