1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Zbigniew Jędrzejewski-Szmek
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.
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.
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/>.
24 #include "conf-parser.h"
25 #include "sleep-config.h"
31 #define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0)
33 int parse_sleep_config(const char *verb, char ***_modes, char ***_states) {
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;
39 char **modes, **states;
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 },
51 config_parse(NULL, PKGSYSCONFDIR "/sleep.conf", NULL,
53 config_item_table_lookup, items, false, false, true, NULL);
55 if (streq(verb, "suspend")) {
56 /* empty by default */
57 USE(modes, suspend_mode);
60 USE(states, suspend_state);
62 states = strv_new("mem", "standby", "freeze", NULL);
64 } else if (streq(verb, "hibernate")) {
66 USE(modes, hibernate_mode);
68 modes = strv_new("platform", "shutdown", NULL);
71 USE(states, hibernate_state);
73 states = strv_new("disk", NULL);
75 } else if (streq(verb, "hybrid-sleep")) {
77 USE(modes, hybrid_mode);
79 modes = strv_new("suspend", "platform", "shutdown", NULL);
82 USE(states, hybrid_state);
84 states = strv_new("disk", NULL);
87 assert_not_reached("what verb");
89 if ((!modes && !streq(verb, "suspend")) || !states) {
100 int can_sleep_state(char **types) {
103 _cleanup_free_ char *p = NULL;
105 if (strv_isempty(types))
108 /* If /sys is read-only we cannot sleep */
109 if (access("/sys/power/state", W_OK) < 0)
112 r = read_one_line_file("/sys/power/state", &p);
116 STRV_FOREACH(type, types) {
117 const char *word, *state;
121 FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
122 if (l == k && memcmp(word, *type, l) == 0)
129 int can_sleep_disk(char **types) {
132 _cleanup_free_ char *p = NULL;
134 if (strv_isempty(types))
137 /* If /sys is read-only we cannot sleep */
138 if (access("/sys/power/disk", W_OK) < 0)
141 r = read_one_line_file("/sys/power/disk", &p);
145 STRV_FOREACH(type, types) {
146 const char *word, *state;
150 FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
151 if (l == k && memcmp(word, *type, l) == 0)
156 memcmp(word + 1, *type, l - 2) == 0 &&
165 #define HIBERNATION_SWAP_THRESHOLD 0.98
167 static int hibernation_partition_size(size_t *size, size_t *used) {
168 _cleanup_fclose_ FILE *f;
174 f = fopen("/proc/swaps", "re");
176 log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
177 "Failed to retrieve open /proc/swaps: %m");
182 (void) fscanf(f, "%*s %*s %*s %*s %*s\n");
185 _cleanup_free_ char *dev = NULL, *type = NULL;
186 size_t size_field, used_field;
190 "%ms " /* device/file */
191 "%ms " /* type of swap */
192 "%zd " /* swap size */
194 "%*i\n", /* priority */
195 &dev, &type, &size_field, &used_field);
200 log_warning("Failed to parse /proc/swaps:%u", i);
204 if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
205 log_warning("Ignoring deleted swapfile '%s'.", dev);
214 log_debug("No swap partitions were found.");
218 static bool enough_memory_for_hibernation(void) {
219 _cleanup_free_ char *active = NULL;
220 unsigned long long act = 0;
221 size_t size = 0, used = 0;
224 r = hibernation_partition_size(&size, &used);
228 r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
230 log_error("Failed to retrieve Active(anon) from /proc/meminfo: %s", strerror(-r));
234 r = safe_atollu(active, &act);
236 log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s",
237 active, strerror(-r));
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);
248 int can_sleep(const char *verb) {
249 _cleanup_strv_free_ char **modes = NULL, **states = NULL;
252 assert(streq(verb, "suspend") ||
253 streq(verb, "hibernate") ||
254 streq(verb, "hybrid-sleep"));
256 r = parse_sleep_config(verb, &modes, &states);
260 if (!can_sleep_state(states) || !can_sleep_disk(modes))
263 return streq(verb, "suspend") || enough_memory_for_hibernation();