#include <stdio.h>

#include "alloc-util.h"

#include "conf-parser.h"

#include "fd-util.h"

#include "fileio.h"

#include "log.h"

#include "sleep-config.h"

#include "string-util.h"

#include "strv.h"

#include "util.h"

#include "parse-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_proc_field("/proc/meminfo", "Active(anon)", WHITESPACE, &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();

}