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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Zbigniew Jędrzejewski-Szmek
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include "conf-parser.h"
#include "sleep-config.h"
#include "fileio.h"
#include "log.h"
#include "strv.h"
#include "util.h"
#define USE(x, y) do{ (x) = (y); (y) = NULL; } while(0)
int parse_sleep_config(const char *verb, char ***_modes, char ***_states) {
_cleanup_strv_free_ char
**suspend_mode = NULL, **suspend_state = NULL,
**hibernate_mode = NULL, **hibernate_state = NULL,
**hybrid_mode = NULL, **hybrid_state = NULL;
char **modes, **states;
const ConfigTableItem items[] = {
{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
{}
};
config_parse_many(PKGSYSCONFDIR "/sleep.conf",
CONF_DIRS_NULSTR("systemd/sleep.conf"),
"Sleep\0", config_item_table_lookup, items,
false, NULL);
if (streq(verb, "suspend")) {
/* empty by default */
USE(modes, suspend_mode);
if (suspend_state)
USE(states, suspend_state);
else
states = strv_new("mem", "standby", "freeze", NULL);
} else if (streq(verb, "hibernate")) {
if (hibernate_mode)
USE(modes, hibernate_mode);
else
modes = strv_new("platform", "shutdown", NULL);
if (hibernate_state)
USE(states, hibernate_state);
else
states = strv_new("disk", NULL);
} else if (streq(verb, "hybrid-sleep")) {
if (hybrid_mode)
USE(modes, hybrid_mode);
else
modes = strv_new("suspend", "platform", "shutdown", NULL);
if (hybrid_state)
USE(states, hybrid_state);
else
states = strv_new("disk", NULL);
} else
assert_not_reached("what verb");
if ((!modes && !streq(verb, "suspend")) || !states) {
strv_free(modes);
strv_free(states);
return log_oom();
}
*_modes = modes;
*_states = states;
return 0;
}
int can_sleep_state(char **types) {
char **type;
int r;
_cleanup_free_ char *p = NULL;
if (strv_isempty(types))
return true;
/* If /sys is read-only we cannot sleep */
if (access("/sys/power/state", W_OK) < 0)
return false;
r = read_one_line_file("/sys/power/state", &p);
if (r < 0)
return false;
STRV_FOREACH(type, types) {
const char *word, *state;
size_t l, k;
k = strlen(*type);
FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state)
if (l == k && memcmp(word, *type, l) == 0)
return true;
}
return false;
}
int can_sleep_disk(char **types) {
char **type;
int r;
_cleanup_free_ char *p = NULL;
if (strv_isempty(types))
return true;
/* If /sys is read-only we cannot sleep */
if (access("/sys/power/disk", W_OK) < 0)
return false;
r = read_one_line_file("/sys/power/disk", &p);
if (r < 0)
return false;
STRV_FOREACH(type, types) {
const char *word, *state;
size_t l, k;
k = strlen(*type);
FOREACH_WORD_SEPARATOR(word, l, p, WHITESPACE, state) {
if (l == k && memcmp(word, *type, l) == 0)
return true;
if (l == k + 2 &&
word[0] == '[' &&
memcmp(word + 1, *type, l - 2) == 0 &&
word[l-1] == ']')
return true;
}
}
return false;
}
#define HIBERNATION_SWAP_THRESHOLD 0.98
static int hibernation_partition_size(size_t *size, size_t *used) {
_cleanup_fclose_ FILE *f;
unsigned i;
assert(size);
assert(used);
f = fopen("/proc/swaps", "re");
if (!f) {
log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
"Failed to retrieve open /proc/swaps: %m");
assert(errno > 0);
return -errno;
}
(void) fscanf(f, "%*s %*s %*s %*s %*s\n");
for (i = 1;; i++) {
_cleanup_free_ char *dev = NULL, *type = NULL;
size_t size_field, used_field;
int k;
k = fscanf(f,
"%ms " /* device/file */
"%ms " /* type of swap */
"%zu " /* swap size */
"%zu " /* used */
"%*i\n", /* priority */
&dev, &type, &size_field, &used_field);
if (k != 4) {
if (k == EOF)
break;
log_warning("Failed to parse /proc/swaps:%u", i);
continue;
}
if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
log_warning("Ignoring deleted swapfile '%s'.", dev);
continue;
}
*size = size_field;
*used = used_field;
return 0;
}
log_debug("No swap partitions were found.");
return -ENOSYS;
}
static bool enough_memory_for_hibernation(void) {
_cleanup_free_ char *active = NULL;
unsigned long long act = 0;
size_t size = 0, used = 0;
int r;
r = hibernation_partition_size(&size, &used);
if (r < 0)
return false;
r = get_status_field("/proc/meminfo", "\nActive(anon):", &active);
if (r < 0) {
log_error_errno(r, "Failed to retrieve Active(anon) from /proc/meminfo: %m");
return false;
}
r = safe_atollu(active, &act);
if (r < 0) {
log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
active);
return false;
}
r = act <= (size - used) * HIBERNATION_SWAP_THRESHOLD;
log_debug("Hibernation is %spossible, Active(anon)=%llu kB, size=%zu kB, used=%zu kB, threshold=%.2g%%",
r ? "" : "im", act, size, used, 100*HIBERNATION_SWAP_THRESHOLD);
return r;
}
int can_sleep(const char *verb) {
_cleanup_strv_free_ char **modes = NULL, **states = NULL;
int r;
assert(streq(verb, "suspend") ||
streq(verb, "hibernate") ||
streq(verb, "hybrid-sleep"));
r = parse_sleep_config(verb, &modes, &states);
if (r < 0)
return false;
if (!can_sleep_state(states) || !can_sleep_disk(modes))
return false;
return streq(verb, "suspend") || enough_memory_for_hibernation();
}
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