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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) { | |
19adb8a3 ZJS |
34 | _cleanup_strv_free_ char |
35 | **suspend_mode = NULL, **suspend_state = NULL, | |
36 | **hibernate_mode = NULL, **hibernate_state = NULL, | |
37 | **hybrid_mode = NULL, **hybrid_state = NULL; | |
dabeaa46 | 38 | char **modes, **states; |
19adb8a3 ZJS |
39 | |
40 | const ConfigTableItem items[] = { | |
41 | { "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode }, | |
42 | { "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state }, | |
43 | { "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode }, | |
44 | { "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state }, | |
45 | { "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode }, | |
46 | { "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state }, | |
47 | {}}; | |
48 | ||
49 | int r; | |
50 | FILE _cleanup_fclose_ *f; | |
51 | ||
52 | f = fopen(PKGSYSCONFDIR "/sleep.conf", "re"); | |
0ee8d636 ZJS |
53 | if (!f) |
54 | log_full(errno == ENOENT ? LOG_DEBUG: LOG_WARNING, | |
55 | "Failed to open configuration file " PKGSYSCONFDIR "/sleep.conf: %m"); | |
56 | else { | |
57 | r = config_parse(NULL, PKGSYSCONFDIR "/sleep.conf", f, "Sleep\0", | |
58 | config_item_table_lookup, (void*) items, false, false, NULL); | |
59 | if (r < 0) | |
60 | log_warning("Failed to parse configuration file: %s", strerror(-r)); | |
19adb8a3 ZJS |
61 | } |
62 | ||
19adb8a3 ZJS |
63 | if (streq(verb, "suspend")) { |
64 | /* empty by default */ | |
dabeaa46 | 65 | USE(modes, suspend_mode); |
19adb8a3 ZJS |
66 | |
67 | if (suspend_state) | |
dabeaa46 | 68 | USE(states, suspend_state); |
19adb8a3 | 69 | else |
dabeaa46 | 70 | states = strv_new("mem", "standby", "freeze", NULL); |
19adb8a3 | 71 | |
19adb8a3 ZJS |
72 | } else if (streq(verb, "hibernate")) { |
73 | if (hibernate_mode) | |
dabeaa46 | 74 | USE(modes, hibernate_mode); |
19adb8a3 | 75 | else |
dabeaa46 | 76 | modes = strv_new("platform", "shutdown", NULL); |
19adb8a3 ZJS |
77 | |
78 | if (hibernate_state) | |
dabeaa46 | 79 | USE(states, hibernate_state); |
19adb8a3 | 80 | else |
dabeaa46 | 81 | states = strv_new("disk", NULL); |
19adb8a3 | 82 | |
19adb8a3 ZJS |
83 | } else if (streq(verb, "hybrid-sleep")) { |
84 | if (hybrid_mode) | |
dabeaa46 | 85 | USE(modes, hybrid_mode); |
19adb8a3 | 86 | else |
dabeaa46 | 87 | modes = strv_new("suspend", "platform", "shutdown", NULL); |
19adb8a3 ZJS |
88 | |
89 | if (hybrid_state) | |
dabeaa46 | 90 | USE(states, hybrid_state); |
19adb8a3 | 91 | else |
dabeaa46 | 92 | states = strv_new("disk", NULL); |
19adb8a3 | 93 | |
19adb8a3 ZJS |
94 | } else |
95 | assert_not_reached("what verb"); | |
96 | ||
dabeaa46 ZJS |
97 | if ((!modes && !streq(verb, "suspend")) || !states) { |
98 | strv_free(modes); | |
99 | strv_free(states); | |
19adb8a3 ZJS |
100 | return log_oom(); |
101 | } | |
102 | ||
dabeaa46 ZJS |
103 | *_modes = modes; |
104 | *_states = states; | |
19adb8a3 ZJS |
105 | return 0; |
106 | } | |
107 | ||
108 | int can_sleep_state(char **types) { | |
109 | char *w, *state, **type; | |
110 | int r; | |
111 | _cleanup_free_ char *p = NULL; | |
112 | ||
113 | if (strv_isempty(types)) | |
114 | return true; | |
115 | ||
116 | /* If /sys is read-only we cannot sleep */ | |
117 | if (access("/sys/power/state", W_OK) < 0) | |
118 | return false; | |
119 | ||
120 | r = read_one_line_file("/sys/power/state", &p); | |
121 | if (r < 0) | |
122 | return false; | |
123 | ||
124 | STRV_FOREACH(type, types) { | |
125 | size_t l, k; | |
126 | ||
127 | k = strlen(*type); | |
128 | FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) | |
129 | if (l == k && memcmp(w, *type, l) == 0) | |
130 | return true; | |
131 | } | |
132 | ||
133 | return false; | |
134 | } | |
135 | ||
136 | int can_sleep_disk(char **types) { | |
137 | char *w, *state, **type; | |
138 | int r; | |
139 | _cleanup_free_ char *p = NULL; | |
140 | ||
141 | if (strv_isempty(types)) | |
142 | return true; | |
143 | ||
144 | /* If /sys is read-only we cannot sleep */ | |
145 | if (access("/sys/power/disk", W_OK) < 0) | |
146 | return false; | |
147 | ||
148 | r = read_one_line_file("/sys/power/disk", &p); | |
149 | if (r < 0) | |
150 | return false; | |
151 | ||
152 | STRV_FOREACH(type, types) { | |
153 | size_t l, k; | |
154 | ||
155 | k = strlen(*type); | |
156 | FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) { | |
157 | if (l == k && memcmp(w, *type, l) == 0) | |
158 | return true; | |
159 | ||
160 | if (l == k + 2 && w[0] == '[' && memcmp(w + 1, *type, l - 2) == 0 && w[l-1] == ']') | |
161 | return true; | |
162 | } | |
163 | } | |
164 | ||
165 | return false; | |
166 | } | |
167 | ||
69ab8088 ZJS |
168 | #define HIBERNATION_SWAP_THRESHOLD 0.98 |
169 | ||
9fb3675e ZJS |
170 | static int hibernation_partition_size(size_t *size, size_t *used) { |
171 | _cleanup_fclose_ FILE *f; | |
172 | int i; | |
173 | ||
174 | assert(size); | |
175 | assert(used); | |
176 | ||
c8a202b7 | 177 | f = fopen("/proc/swaps", "re"); |
9fb3675e ZJS |
178 | if (!f) { |
179 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
180 | "Failed to retrieve open /proc/swaps: %m"); | |
181 | assert(errno > 0); | |
182 | return -errno; | |
183 | } | |
69ab8088 | 184 | |
9fb3675e ZJS |
185 | (void) fscanf(f, "%*s %*s %*s %*s %*s\n"); |
186 | ||
187 | for (i = 1;; i++) { | |
db69869f | 188 | _cleanup_free_ char *dev = NULL, *type = NULL; |
9fb3675e ZJS |
189 | size_t size_field, used_field; |
190 | int k; | |
191 | ||
192 | k = fscanf(f, | |
193 | "%ms " /* device/file */ | |
194 | "%ms " /* type of swap */ | |
195 | "%zd " /* swap size */ | |
196 | "%zd " /* used */ | |
197 | "%*i\n", /* priority */ | |
198 | &dev, &type, &size_field, &used_field); | |
199 | if (k != 4) { | |
200 | if (k == EOF) | |
201 | break; | |
202 | ||
203 | log_warning("Failed to parse /proc/swaps:%u", i); | |
204 | continue; | |
205 | } | |
206 | ||
db69869f DR |
207 | if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) { |
208 | log_warning("Ignoring deleted swapfile '%s'.", dev); | |
9fb3675e ZJS |
209 | continue; |
210 | } | |
211 | ||
212 | *size = size_field; | |
213 | *used = used_field; | |
214 | return 0; | |
69ab8088 ZJS |
215 | } |
216 | ||
9fb3675e ZJS |
217 | log_debug("No swap partitions were found."); |
218 | return -ENOSYS; | |
219 | } | |
220 | ||
221 | static bool enough_memory_for_hibernation(void) { | |
222 | _cleanup_free_ char *active = NULL; | |
223 | unsigned long long act; | |
224 | size_t size, used; | |
225 | int r; | |
226 | ||
227 | r = hibernation_partition_size(&size, &used); | |
228 | if (r < 0) | |
69ab8088 | 229 | return false; |
69ab8088 ZJS |
230 | |
231 | r = get_status_field("/proc/meminfo", "\nActive(anon):", &active); | |
232 | if (r < 0) { | |
233 | log_error("Failed to retrieve Active(anon) from /proc/meminfo: %s", strerror(-r)); | |
234 | return false; | |
235 | } | |
236 | ||
237 | r = safe_atollu(active, &act); | |
238 | if (r < 0) { | |
239 | log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s", | |
240 | active, strerror(-r)); | |
241 | return false; | |
242 | } | |
243 | ||
9fb3675e ZJS |
244 | r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD; |
245 | log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%", | |
246 | r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD); | |
69ab8088 ZJS |
247 | |
248 | return r; | |
249 | } | |
250 | ||
19adb8a3 ZJS |
251 | int can_sleep(const char *verb) { |
252 | _cleanup_strv_free_ char **modes = NULL, **states = NULL; | |
253 | int r; | |
254 | ||
255 | assert(streq(verb, "suspend") || | |
256 | streq(verb, "hibernate") || | |
257 | streq(verb, "hybrid-sleep")); | |
258 | ||
259 | r = parse_sleep_config(verb, &modes, &states); | |
260 | if (r < 0) | |
261 | return false; | |
262 | ||
69ab8088 ZJS |
263 | if (!can_sleep_state(states) || !can_sleep_disk(modes)) |
264 | return false; | |
265 | ||
266 | return streq(verb, "suspend") || enough_memory_for_hibernation(); | |
19adb8a3 | 267 | } |