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19adb8a3 ZJS |
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" | |
19adb8a3 ZJS |
25 | #include "fileio.h" |
26 | #include "log.h" | |
07630cea | 27 | #include "string-util.h" |
19adb8a3 ZJS |
28 | #include "strv.h" |
29 | #include "util.h" | |
07630cea | 30 | #include "sleep-config.h" |
19adb8a3 | 31 | |
dabeaa46 ZJS |
32 | #define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0) |
33 | ||
34 | int parse_sleep_config(const char *verb, char ***_modes, char ***_states) { | |
34c10968 | 35 | |
19adb8a3 ZJS |
36 | _cleanup_strv_free_ char |
37 | **suspend_mode = NULL, **suspend_state = NULL, | |
38 | **hibernate_mode = NULL, **hibernate_state = NULL, | |
39 | **hybrid_mode = NULL, **hybrid_state = NULL; | |
dabeaa46 | 40 | char **modes, **states; |
19adb8a3 ZJS |
41 | |
42 | const ConfigTableItem items[] = { | |
43 | { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode }, | |
44 | { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state }, | |
45 | { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode }, | |
46 | { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state }, | |
47 | { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode }, | |
48 | { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state }, | |
34c10968 LP |
49 | {} |
50 | }; | |
19adb8a3 | 51 | |
778b6a3f JT |
52 | config_parse_many(PKGSYSCONFDIR "/sleep.conf", |
53 | CONF_DIRS_NULSTR("systemd/sleep.conf"), | |
54 | "Sleep\0", config_item_table_lookup, items, | |
55 | false, NULL); | |
19adb8a3 | 56 | |
19adb8a3 ZJS |
57 | if (streq(verb, "suspend")) { |
58 | /* empty by default */ | |
dabeaa46 | 59 | USE(modes, suspend_mode); |
19adb8a3 ZJS |
60 | |
61 | if (suspend_state) | |
dabeaa46 | 62 | USE(states, suspend_state); |
19adb8a3 | 63 | else |
dabeaa46 | 64 | states = strv_new("mem", "standby", "freeze", NULL); |
19adb8a3 | 65 | |
19adb8a3 ZJS |
66 | } else if (streq(verb, "hibernate")) { |
67 | if (hibernate_mode) | |
dabeaa46 | 68 | USE(modes, hibernate_mode); |
19adb8a3 | 69 | else |
dabeaa46 | 70 | modes = strv_new("platform", "shutdown", NULL); |
19adb8a3 ZJS |
71 | |
72 | if (hibernate_state) | |
dabeaa46 | 73 | USE(states, hibernate_state); |
19adb8a3 | 74 | else |
dabeaa46 | 75 | states = strv_new("disk", NULL); |
19adb8a3 | 76 | |
19adb8a3 ZJS |
77 | } else if (streq(verb, "hybrid-sleep")) { |
78 | if (hybrid_mode) | |
dabeaa46 | 79 | USE(modes, hybrid_mode); |
19adb8a3 | 80 | else |
dabeaa46 | 81 | modes = strv_new("suspend", "platform", "shutdown", NULL); |
19adb8a3 ZJS |
82 | |
83 | if (hybrid_state) | |
dabeaa46 | 84 | USE(states, hybrid_state); |
19adb8a3 | 85 | else |
dabeaa46 | 86 | states = strv_new("disk", NULL); |
19adb8a3 | 87 | |
19adb8a3 ZJS |
88 | } else |
89 | assert_not_reached("what verb"); | |
90 | ||
dabeaa46 ZJS |
91 | if ((!modes && !streq(verb, "suspend")) || !states) { |
92 | strv_free(modes); | |
93 | strv_free(states); | |
19adb8a3 ZJS |
94 | return log_oom(); |
95 | } | |
96 | ||
dabeaa46 ZJS |
97 | *_modes = modes; |
98 | *_states = states; | |
19adb8a3 ZJS |
99 | return 0; |
100 | } | |
101 | ||
102 | int can_sleep_state(char **types) { | |
a2a5291b | 103 | char **type; |
19adb8a3 ZJS |
104 | int r; |
105 | _cleanup_free_ char *p = NULL; | |
106 | ||
107 | if (strv_isempty(types)) | |
108 | return true; | |
109 | ||
110 | /* If /sys is read-only we cannot sleep */ | |
111 | if (access("/sys/power/state", W_OK) < 0) | |
112 | return false; | |
113 | ||
114 | r = read_one_line_file("/sys/power/state", &p); | |
115 | if (r < 0) | |
116 | return false; | |
117 | ||
118 | STRV_FOREACH(type, types) { | |
a2a5291b | 119 | const char *word, *state; |
19adb8a3 ZJS |
120 | size_t l, k; |
121 | ||
122 | k = strlen(*type); | |
a2a5291b ZJS |
123 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) |
124 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
125 | return true; |
126 | } | |
127 | ||
128 | return false; | |
129 | } | |
130 | ||
131 | int can_sleep_disk(char **types) { | |
a2a5291b | 132 | char **type; |
19adb8a3 ZJS |
133 | int r; |
134 | _cleanup_free_ char *p = NULL; | |
135 | ||
136 | if (strv_isempty(types)) | |
137 | return true; | |
138 | ||
139 | /* If /sys is read-only we cannot sleep */ | |
140 | if (access("/sys/power/disk", W_OK) < 0) | |
141 | return false; | |
142 | ||
143 | r = read_one_line_file("/sys/power/disk", &p); | |
144 | if (r < 0) | |
145 | return false; | |
146 | ||
147 | STRV_FOREACH(type, types) { | |
a2a5291b | 148 | const char *word, *state; |
19adb8a3 ZJS |
149 | size_t l, k; |
150 | ||
151 | k = strlen(*type); | |
a2a5291b ZJS |
152 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) { |
153 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
154 | return true; |
155 | ||
a2a5291b ZJS |
156 | if (l == k + 2 && |
157 | word[0] == '[' && | |
158 | memcmp(word + 1, *type, l - 2) == 0 && | |
159 | word[l-1] == ']') | |
19adb8a3 ZJS |
160 | return true; |
161 | } | |
162 | } | |
163 | ||
164 | return false; | |
165 | } | |
166 | ||
69ab8088 ZJS |
167 | #define HIBERNATION_SWAP_THRESHOLD 0.98 |
168 | ||
9fb3675e ZJS |
169 | static int hibernation_partition_size(size_t *size, size_t *used) { |
170 | _cleanup_fclose_ FILE *f; | |
1fa2f38f | 171 | unsigned i; |
9fb3675e ZJS |
172 | |
173 | assert(size); | |
174 | assert(used); | |
175 | ||
c8a202b7 | 176 | f = fopen("/proc/swaps", "re"); |
9fb3675e ZJS |
177 | if (!f) { |
178 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
179 | "Failed to retrieve open /proc/swaps: %m"); | |
180 | assert(errno > 0); | |
181 | return -errno; | |
182 | } | |
69ab8088 | 183 | |
9fb3675e ZJS |
184 | (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
185 | ||
186 | for (i = 1;; i++) { | |
db69869f | 187 | _cleanup_free_ char *dev = NULL, *type = NULL; |
9fb3675e ZJS |
188 | size_t size_field, used_field; |
189 | int k; | |
190 | ||
191 | k = fscanf(f, | |
192 | "%ms " /* device/file */ | |
193 | "%ms " /* type of swap */ | |
1fa2f38f ZJS |
194 | "%zu " /* swap size */ |
195 | "%zu " /* used */ | |
9fb3675e ZJS |
196 | "%*i\n", /* priority */ |
197 | &dev, &type, &size_field, &used_field); | |
198 | if (k != 4) { | |
199 | if (k == EOF) | |
200 | break; | |
201 | ||
202 | log_warning("Failed to parse /proc/swaps:%u", i); | |
203 | continue; | |
204 | } | |
205 | ||
db69869f DR |
206 | if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
207 | log_warning("Ignoring deleted swapfile '%s'.", dev); | |
9fb3675e ZJS |
208 | continue; |
209 | } | |
210 | ||
211 | *size = size_field; | |
212 | *used = used_field; | |
213 | return 0; | |
69ab8088 ZJS |
214 | } |
215 | ||
9fb3675e ZJS |
216 | log_debug("No swap partitions were found."); |
217 | return -ENOSYS; | |
218 | } | |
219 | ||
220 | static bool enough_memory_for_hibernation(void) { | |
221 | _cleanup_free_ char *active = NULL; | |
39883f62 LP |
222 | unsigned long long act = 0; |
223 | size_t size = 0, used = 0; | |
9fb3675e ZJS |
224 | int r; |
225 | ||
226 | r = hibernation_partition_size(&size, &used); | |
227 | if (r < 0) | |
69ab8088 | 228 | return false; |
69ab8088 | 229 | |
c4cd1d4d | 230 | r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active); |
69ab8088 | 231 | if (r < 0) { |
da927ba9 | 232 | log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
69ab8088 ZJS |
233 | return false; |
234 | } | |
235 | ||
236 | r = safe_atollu(active, &act); | |
237 | if (r < 0) { | |
c33b3297 MS |
238 | log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", |
239 | active); | |
69ab8088 ZJS |
240 | return false; |
241 | } | |
242 | ||
9fb3675e ZJS |
243 | r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
244 | log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", | |
245 | r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); | |
69ab8088 ZJS |
246 | |
247 | return r; | |
248 | } | |
249 | ||
19adb8a3 ZJS |
250 | int can_sleep(const char *verb) { |
251 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
252 | int r; | |
253 | ||
254 | assert(streq(verb, "suspend") || | |
255 | streq(verb, "hibernate") || | |
256 | streq(verb, "hybrid-sleep")); | |
257 | ||
258 | r = parse_sleep_config(verb, &modes, &states); | |
259 | if (r < 0) | |
260 | return false; | |
261 | ||
69ab8088 ZJS |
262 | if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
263 | return false; | |
264 | ||
265 | return streq(verb, "suspend") || enough_memory_for_hibernation(); | |
19adb8a3 | 266 | } |