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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" | |
3ffd4af2 | 25 | #include "fd-util.h" |
19adb8a3 ZJS |
26 | #include "fileio.h" |
27 | #include "log.h" | |
3ffd4af2 | 28 | #include "sleep-config.h" |
07630cea | 29 | #include "string-util.h" |
19adb8a3 ZJS |
30 | #include "strv.h" |
31 | #include "util.h" | |
6bedfcbb | 32 | #include "parse-util.h" |
19adb8a3 | 33 | |
dabeaa46 ZJS |
34 | #define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0) |
35 | ||
36 | int parse_sleep_config(const char *verb, char ***_modes, char ***_states) { | |
34c10968 | 37 | |
19adb8a3 ZJS |
38 | _cleanup_strv_free_ char |
39 | **suspend_mode = NULL, **suspend_state = NULL, | |
40 | **hibernate_mode = NULL, **hibernate_state = NULL, | |
41 | **hybrid_mode = NULL, **hybrid_state = NULL; | |
dabeaa46 | 42 | char **modes, **states; |
19adb8a3 ZJS |
43 | |
44 | const ConfigTableItem items[] = { | |
45 | { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode }, | |
46 | { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state }, | |
47 | { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode }, | |
48 | { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state }, | |
49 | { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode }, | |
50 | { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state }, | |
34c10968 LP |
51 | {} |
52 | }; | |
19adb8a3 | 53 | |
778b6a3f JT |
54 | config_parse_many(PKGSYSCONFDIR "/sleep.conf", |
55 | CONF_DIRS_NULSTR("systemd/sleep.conf"), | |
56 | "Sleep\0", config_item_table_lookup, items, | |
57 | false, NULL); | |
19adb8a3 | 58 | |
19adb8a3 ZJS |
59 | if (streq(verb, "suspend")) { |
60 | /* empty by default */ | |
dabeaa46 | 61 | USE(modes, suspend_mode); |
19adb8a3 ZJS |
62 | |
63 | if (suspend_state) | |
dabeaa46 | 64 | USE(states, suspend_state); |
19adb8a3 | 65 | else |
dabeaa46 | 66 | states = strv_new("mem", "standby", "freeze", NULL); |
19adb8a3 | 67 | |
19adb8a3 ZJS |
68 | } else if (streq(verb, "hibernate")) { |
69 | if (hibernate_mode) | |
dabeaa46 | 70 | USE(modes, hibernate_mode); |
19adb8a3 | 71 | else |
dabeaa46 | 72 | modes = strv_new("platform", "shutdown", NULL); |
19adb8a3 ZJS |
73 | |
74 | if (hibernate_state) | |
dabeaa46 | 75 | USE(states, hibernate_state); |
19adb8a3 | 76 | else |
dabeaa46 | 77 | states = strv_new("disk", NULL); |
19adb8a3 | 78 | |
19adb8a3 ZJS |
79 | } else if (streq(verb, "hybrid-sleep")) { |
80 | if (hybrid_mode) | |
dabeaa46 | 81 | USE(modes, hybrid_mode); |
19adb8a3 | 82 | else |
dabeaa46 | 83 | modes = strv_new("suspend", "platform", "shutdown", NULL); |
19adb8a3 ZJS |
84 | |
85 | if (hybrid_state) | |
dabeaa46 | 86 | USE(states, hybrid_state); |
19adb8a3 | 87 | else |
dabeaa46 | 88 | states = strv_new("disk", NULL); |
19adb8a3 | 89 | |
19adb8a3 ZJS |
90 | } else |
91 | assert_not_reached("what verb"); | |
92 | ||
dabeaa46 ZJS |
93 | if ((!modes && !streq(verb, "suspend")) || !states) { |
94 | strv_free(modes); | |
95 | strv_free(states); | |
19adb8a3 ZJS |
96 | return log_oom(); |
97 | } | |
98 | ||
dabeaa46 ZJS |
99 | *_modes = modes; |
100 | *_states = states; | |
19adb8a3 ZJS |
101 | return 0; |
102 | } | |
103 | ||
104 | int can_sleep_state(char **types) { | |
a2a5291b | 105 | char **type; |
19adb8a3 ZJS |
106 | int r; |
107 | _cleanup_free_ char *p = NULL; | |
108 | ||
109 | if (strv_isempty(types)) | |
110 | return true; | |
111 | ||
112 | /* If /sys is read-only we cannot sleep */ | |
113 | if (access("/sys/power/state", W_OK) < 0) | |
114 | return false; | |
115 | ||
116 | r = read_one_line_file("/sys/power/state", &p); | |
117 | if (r < 0) | |
118 | return false; | |
119 | ||
120 | STRV_FOREACH(type, types) { | |
a2a5291b | 121 | const char *word, *state; |
19adb8a3 ZJS |
122 | size_t l, k; |
123 | ||
124 | k = strlen(*type); | |
a2a5291b ZJS |
125 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) |
126 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
127 | return true; |
128 | } | |
129 | ||
130 | return false; | |
131 | } | |
132 | ||
133 | int can_sleep_disk(char **types) { | |
a2a5291b | 134 | char **type; |
19adb8a3 ZJS |
135 | int r; |
136 | _cleanup_free_ char *p = NULL; | |
137 | ||
138 | if (strv_isempty(types)) | |
139 | return true; | |
140 | ||
141 | /* If /sys is read-only we cannot sleep */ | |
142 | if (access("/sys/power/disk", W_OK) < 0) | |
143 | return false; | |
144 | ||
145 | r = read_one_line_file("/sys/power/disk", &p); | |
146 | if (r < 0) | |
147 | return false; | |
148 | ||
149 | STRV_FOREACH(type, types) { | |
a2a5291b | 150 | const char *word, *state; |
19adb8a3 ZJS |
151 | size_t l, k; |
152 | ||
153 | k = strlen(*type); | |
a2a5291b ZJS |
154 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) { |
155 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
156 | return true; |
157 | ||
a2a5291b ZJS |
158 | if (l == k + 2 && |
159 | word[0] == '[' && | |
160 | memcmp(word + 1, *type, l - 2) == 0 && | |
161 | word[l-1] == ']') | |
19adb8a3 ZJS |
162 | return true; |
163 | } | |
164 | } | |
165 | ||
166 | return false; | |
167 | } | |
168 | ||
69ab8088 ZJS |
169 | #define HIBERNATION_SWAP_THRESHOLD 0.98 |
170 | ||
9fb3675e ZJS |
171 | static int hibernation_partition_size(size_t *size, size_t *used) { |
172 | _cleanup_fclose_ FILE *f; | |
1fa2f38f | 173 | unsigned i; |
9fb3675e ZJS |
174 | |
175 | assert(size); | |
176 | assert(used); | |
177 | ||
c8a202b7 | 178 | f = fopen("/proc/swaps", "re"); |
9fb3675e ZJS |
179 | if (!f) { |
180 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
181 | "Failed to retrieve open /proc/swaps: %m"); | |
182 | assert(errno > 0); | |
183 | return -errno; | |
184 | } | |
69ab8088 | 185 | |
9fb3675e ZJS |
186 | (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
187 | ||
188 | for (i = 1;; i++) { | |
db69869f | 189 | _cleanup_free_ char *dev = NULL, *type = NULL; |
9fb3675e ZJS |
190 | size_t size_field, used_field; |
191 | int k; | |
192 | ||
193 | k = fscanf(f, | |
194 | "%ms " /* device/file */ | |
195 | "%ms " /* type of swap */ | |
1fa2f38f ZJS |
196 | "%zu " /* swap size */ |
197 | "%zu " /* used */ | |
9fb3675e ZJS |
198 | "%*i\n", /* priority */ |
199 | &dev, &type, &size_field, &used_field); | |
200 | if (k != 4) { | |
201 | if (k == EOF) | |
202 | break; | |
203 | ||
204 | log_warning("Failed to parse /proc/swaps:%u", i); | |
205 | continue; | |
206 | } | |
207 | ||
db69869f DR |
208 | if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
209 | log_warning("Ignoring deleted swapfile '%s'.", dev); | |
9fb3675e ZJS |
210 | continue; |
211 | } | |
212 | ||
213 | *size = size_field; | |
214 | *used = used_field; | |
215 | return 0; | |
69ab8088 ZJS |
216 | } |
217 | ||
9fb3675e ZJS |
218 | log_debug("No swap partitions were found."); |
219 | return -ENOSYS; | |
220 | } | |
221 | ||
222 | static bool enough_memory_for_hibernation(void) { | |
223 | _cleanup_free_ char *active = NULL; | |
39883f62 LP |
224 | unsigned long long act = 0; |
225 | size_t size = 0, used = 0; | |
9fb3675e ZJS |
226 | int r; |
227 | ||
228 | r = hibernation_partition_size(&size, &used); | |
229 | if (r < 0) | |
69ab8088 | 230 | return false; |
69ab8088 | 231 | |
c4cd1d4d | 232 | r = get_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &active); |
69ab8088 | 233 | if (r < 0) { |
da927ba9 | 234 | log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
69ab8088 ZJS |
235 | return false; |
236 | } | |
237 | ||
238 | r = safe_atollu(active, &act); | |
239 | if (r < 0) { | |
c33b3297 MS |
240 | log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", |
241 | active); | |
69ab8088 ZJS |
242 | return false; |
243 | } | |
244 | ||
9fb3675e ZJS |
245 | r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
246 | log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", | |
247 | r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); | |
69ab8088 ZJS |
248 | |
249 | return r; | |
250 | } | |
251 | ||
19adb8a3 ZJS |
252 | int can_sleep(const char *verb) { |
253 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
254 | int r; | |
255 | ||
256 | assert(streq(verb, "suspend") || | |
257 | streq(verb, "hibernate") || | |
258 | streq(verb, "hybrid-sleep")); | |
259 | ||
260 | r = parse_sleep_config(verb, &modes, &states); | |
261 | if (r < 0) | |
262 | return false; | |
263 | ||
69ab8088 ZJS |
264 | if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
265 | return false; | |
266 | ||
267 | return streq(verb, "suspend") || enough_memory_for_hibernation(); | |
19adb8a3 | 268 | } |