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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" | |
25 | #include "sleep-config.h" | |
26 | #include "fileio.h" | |
27 | #include "log.h" | |
28 | #include "strv.h" | |
29 | #include "util.h" | |
30 | ||
dabeaa46 ZJS |
31 | #define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0) |
32 | ||
33 | int parse_sleep_config(const char *verb, char ***_modes, char ***_states) { | |
34c10968 | 34 | |
19adb8a3 ZJS |
35 | _cleanup_strv_free_ char |
36 | **suspend_mode = NULL, **suspend_state = NULL, | |
37 | **hibernate_mode = NULL, **hibernate_state = NULL, | |
38 | **hybrid_mode = NULL, **hybrid_state = NULL; | |
dabeaa46 | 39 | char **modes, **states; |
19adb8a3 ZJS |
40 | |
41 | 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 }, | |
34c10968 LP |
48 | {} |
49 | }; | |
19adb8a3 | 50 | |
36f822c4 ZJS |
51 | config_parse(NULL, PKGSYSCONFDIR "/sleep.conf", NULL, |
52 | "Sleep\0", | |
53 | config_item_table_lookup, items, false, false, true, NULL); | |
19adb8a3 | 54 | |
19adb8a3 ZJS |
55 | if (streq(verb, "suspend")) { |
56 | /* empty by default */ | |
dabeaa46 | 57 | USE(modes, suspend_mode); |
19adb8a3 ZJS |
58 | |
59 | if (suspend_state) | |
dabeaa46 | 60 | USE(states, suspend_state); |
19adb8a3 | 61 | else |
dabeaa46 | 62 | states = strv_new("mem", "standby", "freeze", NULL); |
19adb8a3 | 63 | |
19adb8a3 ZJS |
64 | } else if (streq(verb, "hibernate")) { |
65 | if (hibernate_mode) | |
dabeaa46 | 66 | USE(modes, hibernate_mode); |
19adb8a3 | 67 | else |
dabeaa46 | 68 | modes = strv_new("platform", "shutdown", NULL); |
19adb8a3 ZJS |
69 | |
70 | if (hibernate_state) | |
dabeaa46 | 71 | USE(states, hibernate_state); |
19adb8a3 | 72 | else |
dabeaa46 | 73 | states = strv_new("disk", NULL); |
19adb8a3 | 74 | |
19adb8a3 ZJS |
75 | } else if (streq(verb, "hybrid-sleep")) { |
76 | if (hybrid_mode) | |
dabeaa46 | 77 | USE(modes, hybrid_mode); |
19adb8a3 | 78 | else |
dabeaa46 | 79 | modes = strv_new("suspend", "platform", "shutdown", NULL); |
19adb8a3 ZJS |
80 | |
81 | if (hybrid_state) | |
dabeaa46 | 82 | USE(states, hybrid_state); |
19adb8a3 | 83 | else |
dabeaa46 | 84 | states = strv_new("disk", NULL); |
19adb8a3 | 85 | |
19adb8a3 ZJS |
86 | } else |
87 | assert_not_reached("what verb"); | |
88 | ||
dabeaa46 ZJS |
89 | if ((!modes && !streq(verb, "suspend")) || !states) { |
90 | strv_free(modes); | |
91 | strv_free(states); | |
19adb8a3 ZJS |
92 | return log_oom(); |
93 | } | |
94 | ||
dabeaa46 ZJS |
95 | *_modes = modes; |
96 | *_states = states; | |
19adb8a3 ZJS |
97 | return 0; |
98 | } | |
99 | ||
100 | int can_sleep_state(char **types) { | |
a2a5291b | 101 | char **type; |
19adb8a3 ZJS |
102 | int r; |
103 | _cleanup_free_ char *p = NULL; | |
104 | ||
105 | if (strv_isempty(types)) | |
106 | return true; | |
107 | ||
108 | /* If /sys is read-only we cannot sleep */ | |
109 | if (access("/sys/power/state", W_OK) < 0) | |
110 | return false; | |
111 | ||
112 | r = read_one_line_file("/sys/power/state", &p); | |
113 | if (r < 0) | |
114 | return false; | |
115 | ||
116 | STRV_FOREACH(type, types) { | |
a2a5291b | 117 | const char *word, *state; |
19adb8a3 ZJS |
118 | size_t l, k; |
119 | ||
120 | k = strlen(*type); | |
a2a5291b ZJS |
121 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) |
122 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
123 | return true; |
124 | } | |
125 | ||
126 | return false; | |
127 | } | |
128 | ||
129 | int can_sleep_disk(char **types) { | |
a2a5291b | 130 | char **type; |
19adb8a3 ZJS |
131 | int r; |
132 | _cleanup_free_ char *p = NULL; | |
133 | ||
134 | if (strv_isempty(types)) | |
135 | return true; | |
136 | ||
137 | /* If /sys is read-only we cannot sleep */ | |
138 | if (access("/sys/power/disk", W_OK) < 0) | |
139 | return false; | |
140 | ||
141 | r = read_one_line_file("/sys/power/disk", &p); | |
142 | if (r < 0) | |
143 | return false; | |
144 | ||
145 | STRV_FOREACH(type, types) { | |
a2a5291b | 146 | const char *word, *state; |
19adb8a3 ZJS |
147 | size_t l, k; |
148 | ||
149 | k = strlen(*type); | |
a2a5291b ZJS |
150 | FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) { |
151 | if (l == k && memcmp(word, *type, l) == 0) | |
19adb8a3 ZJS |
152 | return true; |
153 | ||
a2a5291b ZJS |
154 | if (l == k + 2 && |
155 | word[0] == '[' && | |
156 | memcmp(word + 1, *type, l - 2) == 0 && | |
157 | word[l-1] == ']') | |
19adb8a3 ZJS |
158 | return true; |
159 | } | |
160 | } | |
161 | ||
162 | return false; | |
163 | } | |
164 | ||
69ab8088 ZJS |
165 | #define HIBERNATION_SWAP_THRESHOLD 0.98 |
166 | ||
9fb3675e ZJS |
167 | static int hibernation_partition_size(size_t *size, size_t *used) { |
168 | _cleanup_fclose_ FILE *f; | |
169 | int i; | |
170 | ||
171 | assert(size); | |
172 | assert(used); | |
173 | ||
c8a202b7 | 174 | f = fopen("/proc/swaps", "re"); |
9fb3675e ZJS |
175 | if (!f) { |
176 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
177 | "Failed to retrieve open /proc/swaps: %m"); | |
178 | assert(errno > 0); | |
179 | return -errno; | |
180 | } | |
69ab8088 | 181 | |
9fb3675e ZJS |
182 | (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
183 | ||
184 | for (i = 1;; i++) { | |
db69869f | 185 | _cleanup_free_ char *dev = NULL, *type = NULL; |
9fb3675e ZJS |
186 | size_t size_field, used_field; |
187 | int k; | |
188 | ||
189 | k = fscanf(f, | |
190 | "%ms " /* device/file */ | |
191 | "%ms " /* type of swap */ | |
192 | "%zd " /* swap size */ | |
193 | "%zd " /* used */ | |
194 | "%*i\n", /* priority */ | |
195 | &dev, &type, &size_field, &used_field); | |
196 | if (k != 4) { | |
197 | if (k == EOF) | |
198 | break; | |
199 | ||
200 | log_warning("Failed to parse /proc/swaps:%u", i); | |
201 | continue; | |
202 | } | |
203 | ||
db69869f DR |
204 | if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
205 | log_warning("Ignoring deleted swapfile '%s'.", dev); | |
9fb3675e ZJS |
206 | continue; |
207 | } | |
208 | ||
209 | *size = size_field; | |
210 | *used = used_field; | |
211 | return 0; | |
69ab8088 ZJS |
212 | } |
213 | ||
9fb3675e ZJS |
214 | log_debug("No swap partitions were found."); |
215 | return -ENOSYS; | |
216 | } | |
217 | ||
218 | static bool enough_memory_for_hibernation(void) { | |
219 | _cleanup_free_ char *active = NULL; | |
39883f62 LP |
220 | unsigned long long act = 0; |
221 | size_t size = 0, used = 0; | |
9fb3675e ZJS |
222 | int r; |
223 | ||
224 | r = hibernation_partition_size(&size, &used); | |
225 | if (r < 0) | |
69ab8088 | 226 | return false; |
69ab8088 ZJS |
227 | |
228 | r = get_status_field("/proc/meminfo", "\nActive(anon):", &active); | |
229 | if (r < 0) { | |
da927ba9 | 230 | log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m"); |
69ab8088 ZJS |
231 | return false; |
232 | } | |
233 | ||
234 | r = safe_atollu(active, &act); | |
235 | if (r < 0) { | |
c33b3297 MS |
236 | log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m", |
237 | active); | |
69ab8088 ZJS |
238 | return false; |
239 | } | |
240 | ||
9fb3675e ZJS |
241 | r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
242 | log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", | |
243 | r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); | |
69ab8088 ZJS |
244 | |
245 | return r; | |
246 | } | |
247 | ||
19adb8a3 ZJS |
248 | int can_sleep(const char *verb) { |
249 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
250 | int r; | |
251 | ||
252 | assert(streq(verb, "suspend") || | |
253 | streq(verb, "hibernate") || | |
254 | streq(verb, "hybrid-sleep")); | |
255 | ||
256 | r = parse_sleep_config(verb, &modes, &states); | |
257 | if (r < 0) | |
258 | return false; | |
259 | ||
69ab8088 ZJS |
260 | if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
261 | return false; | |
262 | ||
263 | return streq(verb, "suspend") || enough_memory_for_hibernation(); | |
19adb8a3 | 264 | } |