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) {
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;
38 char **modes, **states;
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 },
50 FILE _cleanup_fclose_ *f;
52 f = fopen(PKGSYSCONFDIR "/sleep.conf", "re");
54 log_full(errno == ENOENT ? LOG_DEBUG: LOG_WARNING,
55 "Failed to open configuration file " PKGSYSCONFDIR "/sleep.conf: %m");
57 r = config_parse(NULL, PKGSYSCONFDIR "/sleep.conf", f, "Sleep\0",
58 config_item_table_lookup, (void*) items, false, false, NULL);
60 log_warning("Failed to parse configuration file: %s", strerror(-r));
63 if (streq(verb, "suspend")) {
64 /* empty by default */
65 USE(modes, suspend_mode);
68 USE(states, suspend_state);
70 states = strv_new("mem", "standby", "freeze", NULL);
72 } else if (streq(verb, "hibernate")) {
74 USE(modes, hibernate_mode);
76 modes = strv_new("platform", "shutdown", NULL);
79 USE(states, hibernate_state);
81 states = strv_new("disk", NULL);
83 } else if (streq(verb, "hybrid-sleep")) {
85 USE(modes, hybrid_mode);
87 modes = strv_new("suspend", "platform", "shutdown", NULL);
90 USE(states, hybrid_state);
92 states = strv_new("disk", NULL);
95 assert_not_reached("what verb");
97 if ((!modes && !streq(verb, "suspend")) || !states) {
108 int can_sleep_state(char **types) {
109 char *w, *state, **type;
111 _cleanup_free_ char *p = NULL;
113 if (strv_isempty(types))
116 /* If /sys is read-only we cannot sleep */
117 if (access("/sys/power/state", W_OK) < 0)
120 r = read_one_line_file("/sys/power/state", &p);
124 STRV_FOREACH(type, types) {
128 FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state)
129 if (l == k && memcmp(w, *type, l) == 0)
136 int can_sleep_disk(char **types) {
137 char *w, *state, **type;
139 _cleanup_free_ char *p = NULL;
141 if (strv_isempty(types))
144 /* If /sys is read-only we cannot sleep */
145 if (access("/sys/power/disk", W_OK) < 0)
148 r = read_one_line_file("/sys/power/disk", &p);
152 STRV_FOREACH(type, types) {
156 FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) {
157 if (l == k && memcmp(w, *type, l) == 0)
160 if (l == k + 2 && w[0] == '[' && memcmp(w + 1, *type, l - 2) == 0 && w[l-1] == ']')
168 #define HIBERNATION_SWAP_THRESHOLD 0.98
170 static int hibernation_partition_size(size_t *size, size_t *used) {
171 _cleanup_fclose_ FILE *f;
177 f = fopen("/proc/swaps", "re");
179 log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
180 "Failed to retrieve open /proc/swaps: %m");
185 (void) fscanf(f, "%*s %*s %*s %*s %*s\n");
188 _cleanup_free_ char *dev = NULL, *type = NULL;
189 size_t size_field, used_field;
193 "%ms " /* device/file */
194 "%ms " /* type of swap */
195 "%zd " /* swap size */
197 "%*i\n", /* priority */
198 &dev, &type, &size_field, &used_field);
203 log_warning("Failed to parse /proc/swaps:%u", i);
207 if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
208 log_warning("Ignoring deleted swapfile '%s'.", dev);
217 log_debug("No swap partitions were found.");
221 static bool enough_memory_for_hibernation(void) {
222 _cleanup_free_ char *active = NULL;
223 unsigned long long act = 0;
224 size_t size = 0, used = 0;
227 r = hibernation_partition_size(&size, &used);
231 r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
233 log_error("Failed to retrieve Active(anon) from /proc/meminfo: %s", strerror(-r));
237 r = safe_atollu(active, &act);
239 log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s",
240 active, strerror(-r));
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);
251 int can_sleep(const char *verb) {
252 _cleanup_strv_free_ char **modes = NULL, **states = NULL;
255 assert(streq(verb, "suspend") ||
256 streq(verb, "hibernate") ||
257 streq(verb, "hybrid-sleep"));
259 r = parse_sleep_config(verb, &modes, &states);
263 if (!can_sleep_state(states) || !can_sleep_disk(modes))
266 return streq(verb, "suspend") || enough_memory_for_hibernation();