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8950f6426350dbb87f908a0a0b1f70e683876828
systemd/src/sleep/sleep.c
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gvenugo3 8950f64263 sleep: allow HibernateDelaySec and low-battery hibernation to work together 
Previously, setting HibernateDelaySec= would disable ACPI battery trip
point (_BTP) alarms, forcing the system to rely solely on software
polling for battery checks. This could result in the battery draining
to 0% between polling intervals, causing data loss.

Now, when ACPI _BTP is available AND HibernateDelaySec= is set, both
mechanisms work together. The system will hibernate on whichever comes
first: low battery (instant hardware alarm) or the configured timeout.

This also properly respects HibernateOnACPower=no by resetting the
timer while on AC power, matching the documented behavior.

Fixes: https://github.com/systemd/systemd/issues/26498
2026-02-05 10:28:47 +01:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2010-2017 Canonical
Copyright © 2018 Dell Inc.
***/
#include <fcntl.h>
#include <getopt.h>
#include <poll.h>
#include <stdlib.h>
#include <sys/timerfd.h>
#include <sys/utsname.h>
#include "sd-bus.h"
#include "sd-device.h"
#include "sd-id128.h"
#include "sd-json.h"
#include "sd-messages.h"
#include "alloc-util.h"
#include "battery-capacity.h"
#include "battery-util.h"
#include "blockdev-util.h"
#include "build.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-unit-util.h"
#include "bus-util.h"
#include "constants.h"
#include "efivars.h"
#include "env-util.h"
#include "errno-util.h"
#include "exec-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "hibernate-util.h"
#include "io-util.h"
#include "log.h"
#include "main-func.h"
#include "os-util.h"
#include "pretty-print.h"
#include "sleep-config.h"
#include "special.h"
#include "strv.h"
#include "time-util.h"
#define DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY (2 * USEC_PER_HOUR)
static SleepOperation arg_operation = _SLEEP_OPERATION_INVALID;
#if ENABLE_EFI
static int determine_auto_swap(sd_device *device) {
_cleanup_(sd_device_unrefp) sd_device *origin = NULL;
const char *part_designator;
int r;
/* Check if the selected hibernation device is the "auto" one. Specifically, trace to the partition
* block device and check if ID_DISSECT_PART_DESIGNATOR property is set to "swap" by udev
* dissect_image builtin. Later hibernate-resume-generator will generate cryptsetup unit based on
* this info. */
assert(device);
r = block_device_get_originating(device, &origin, /* recursive= */ false);
if (r < 0 && r != -ENOENT)
return r;
if (r >= 0)
device = origin;
r = sd_device_get_property_value(device, "ID_DISSECT_PART_DESIGNATOR", &part_designator);
if (r == -ENOENT)
return false;
if (r < 0)
return r;
return streq(part_designator, "swap");
}
#endif
static int write_efi_hibernate_location(const HibernationDevice *hibernation_device, bool required) {
int log_level = required ? LOG_ERR : LOG_DEBUG;
#if ENABLE_EFI
_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
_cleanup_free_ char *formatted = NULL, *id = NULL, *image_id = NULL,
*version_id = NULL, *image_version = NULL;
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
const char *uuid_str;
sd_id128_t uuid;
struct utsname uts = {};
int r, auto_swap, log_level_ignore = required ? LOG_WARNING : LOG_DEBUG;
assert(hibernation_device);
if (!is_efi_boot())
return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
"Not an EFI boot, passing HibernateLocation via EFI variable is not possible.");
r = sd_device_new_from_devnum(&device, 'b', hibernation_device->devno);
if (r < 0)
return log_full_errno(log_level, r, "Failed to create sd-device object for '%s': %m",
hibernation_device->path);
r = sd_device_get_property_value(device, "ID_FS_UUID", &uuid_str);
if (r < 0)
return log_full_errno(log_level, r, "Failed to get filesystem UUID for device '%s': %m",
hibernation_device->path);
r = sd_id128_from_string(uuid_str, &uuid);
if (r < 0)
return log_full_errno(log_level, r, "Failed to parse ID_FS_UUID '%s' for device '%s': %m",
uuid_str, hibernation_device->path);
auto_swap = determine_auto_swap(device);
if (auto_swap < 0)
log_full_errno(log_level_ignore, auto_swap,
"Failed to get partition designator of '%s', ignoring: %m", hibernation_device->path);
if (uname(&uts) < 0)
log_full_errno(log_level_ignore, errno, "Failed to get kernel info, ignoring: %m");
r = parse_os_release(NULL,
"ID", &id,
"IMAGE_ID", &image_id,
"VERSION_ID", &version_id,
"IMAGE_VERSION", &image_version);
if (r < 0)
log_full_errno(log_level_ignore, r, "Failed to parse os-release, ignoring: %m");
r = sd_json_buildo(
&v,
SD_JSON_BUILD_PAIR_UUID("uuid", uuid),
SD_JSON_BUILD_PAIR_UNSIGNED("offset", hibernation_device->offset),
SD_JSON_BUILD_PAIR_CONDITION(auto_swap >= 0, "autoSwap", SD_JSON_BUILD_BOOLEAN(auto_swap)),
SD_JSON_BUILD_PAIR_CONDITION(!isempty(uts.release), "kernelVersion", SD_JSON_BUILD_STRING(uts.release)),
SD_JSON_BUILD_PAIR_CONDITION(!!id, "osReleaseId", SD_JSON_BUILD_STRING(id)),
SD_JSON_BUILD_PAIR_CONDITION(!!image_id, "osReleaseImageId", SD_JSON_BUILD_STRING(image_id)),
SD_JSON_BUILD_PAIR_CONDITION(!!version_id, "osReleaseVersionId", SD_JSON_BUILD_STRING(version_id)),
SD_JSON_BUILD_PAIR_CONDITION(!!image_version, "osReleaseImageVersion", SD_JSON_BUILD_STRING(image_version)));
if (r < 0)
return log_full_errno(log_level, r, "Failed to build JSON object: %m");
r = sd_json_variant_format(v, 0, &formatted);
if (r < 0)
return log_full_errno(log_level, r, "Failed to format JSON object: %m");
r = efi_set_variable_string(EFI_SYSTEMD_VARIABLE_STR("HibernateLocation"), formatted);
if (r < 0)
return log_full_errno(log_level, r, "Failed to set EFI variable HibernateLocation: %m");
log_debug("Set EFI variable HibernateLocation to '%s'.", formatted);
return 0;
#else
return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
"EFI support not enabled, passing HibernateLocation via EFI variable is not possible.");
#endif
}
static int write_state(int fd, char * const *states) {
int r = 0;
assert(fd >= 0);
assert(states);
STRV_FOREACH(state, states) {
_cleanup_fclose_ FILE *f = NULL;
int k;
k = fdopen_independent(fd, "we", &f);
if (k < 0)
return RET_GATHER(r, k);
k = write_string_stream(f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
if (k >= 0) {
log_debug("Using sleep state '%s'.", *state);
return 0;
}
RET_GATHER(r, log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state));
}
return r;
}
static int write_mode(const char *path, char * const *modes) {
int r, ret = 0;
assert(path);
STRV_FOREACH(mode, modes) {
r = write_string_file(path, *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r >= 0) {
log_debug("Using sleep mode '%s' for %s.", *mode, path);
return 0;
}
RET_GATHER(ret, log_debug_errno(r, "Failed to write '%s' to %s: %m", *mode, path));
}
return ret;
}
static int lock_all_homes(void) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
/* Let's synchronously lock all home directories managed by homed that have been marked for it. This
* way the key material required to access these volumes is hopefully removed from memory. */
r = sd_bus_open_system(&bus);
if (r < 0)
return log_error_errno(r, "Failed to connect to system bus: %m");
r = bus_message_new_method_call(bus, &m, bus_home_mgr, "LockAllHomes");
if (r < 0)
return bus_log_create_error(r);
/* If homed is not running it can't have any home directories active either. */
r = sd_bus_message_set_auto_start(m, false);
if (r < 0)
return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m");
r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL);
if (r < 0) {
if (!bus_error_is_unknown_service(&error))
return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r));
log_debug("systemd-homed is not running, locking of home directories skipped.");
} else
log_debug("Successfully requested locking of all home directories.");
return 0;
}
static int execute(
const SleepConfig *sleep_config,
SleepOperation operation,
const char *action) {
const char *arguments[] = {
NULL,
"pre",
/* NB: we use 'arg_operation' instead of 'operation' here, as we want to communicate the overall
* operation here, not the specific one, in case of s2h. */
sleep_operation_to_string(arg_operation),
NULL
};
static const char* const dirs[] = {
SYSTEM_SLEEP_PATH,
NULL
};
_cleanup_close_ int state_fd = -EBADF;
int r;
assert(sleep_config);
assert(operation >= 0);
assert(operation < _SLEEP_OPERATION_CONFIG_MAX); /* Others are handled by execute_s2h() instead */
if (strv_isempty(sleep_config->states[operation]))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"No sleep states configured for sleep operation %s, can't sleep.",
sleep_operation_to_string(operation));
/* This file is opened first, so that if we hit an error, we can abort before modifying any state. */
state_fd = open("/sys/power/state", O_WRONLY|O_CLOEXEC);
if (state_fd < 0)
return log_error_errno(errno, "Failed to open %s: %m", "/sys/power/state");
if (sleep_needs_mem_sleep(sleep_config, operation)) {
r = write_mode("/sys/power/mem_sleep", sleep_config->mem_modes);
if (r < 0)
return log_error_errno(r, "Failed to write mode to /sys/power/mem_sleep: %m");
}
/* Configure hibernation settings if we are supposed to hibernate */
if (SLEEP_OPERATION_IS_HIBERNATION(operation)) {
_cleanup_(hibernation_device_done) HibernationDevice hibernation_device = {};
bool resume_set;
r = find_suitable_hibernation_device(&hibernation_device);
if (r < 0)
return log_error_errno(r, "Failed to find location to hibernate to: %m");
resume_set = r > 0;
r = write_efi_hibernate_location(&hibernation_device, !resume_set);
if (!resume_set) {
if (r == -EOPNOTSUPP)
return log_error_errno(r, "No valid 'resume=' option found, refusing to hibernate.");
if (r < 0)
return r;
r = write_resume_config(hibernation_device.devno, hibernation_device.offset, hibernation_device.path);
if (r < 0)
goto fail;
}
r = write_mode("/sys/power/disk", sleep_config->modes[operation]);
if (r < 0) {
log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
goto fail;
}
}
/* Pass an action string to the call-outs. This is mostly our operation string, except if the
* hibernate step of s-t-h fails, in which case we communicate that with a separate action. */
if (!action)
action = sleep_operation_to_string(operation);
if (setenv("SYSTEMD_SLEEP_ACTION", action, /* overwrite= */ 1) < 0)
log_warning_errno(errno, "Failed to set SYSTEMD_SLEEP_ACTION=%s, ignoring: %m", action);
(void) execute_directories(
"system-sleep",
dirs,
DEFAULT_TIMEOUT_USEC,
/* callbacks= */ NULL,
/* callback_args= */ NULL,
(char **) arguments,
/* envp= */ NULL,
EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
(void) lock_all_homes();
log_struct(LOG_INFO,
LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_START_STR),
LOG_MESSAGE("Performing sleep operation '%s'...", sleep_operation_to_string(operation)),
LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
r = write_state(state_fd, sleep_config->states[operation]);
if (r < 0)
log_struct_errno(LOG_ERR, r,
LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_STOP_STR),
LOG_MESSAGE("Failed to put system to sleep. System resumed again: %m"),
LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
else
log_struct(LOG_INFO,
LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_STOP_STR),
LOG_MESSAGE("System returned from sleep operation '%s'.", sleep_operation_to_string(arg_operation)),
LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
arguments[1] = "post";
(void) execute_directories(
"system-sleep",
dirs,
DEFAULT_TIMEOUT_USEC,
/* callbacks= */ NULL,
/* callback_args= */ NULL,
(char **) arguments,
/* envp= */ NULL,
EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
if (r >= 0)
return 0;
fail:
if (SLEEP_OPERATION_IS_HIBERNATION(operation))
(void) clear_efi_hibernate_location_and_warn();
return r;
}
/* Return true if wakeup type is APM timer */
static int check_wakeup_type(void) {
static const char dmi_object_path[] = "/sys/firmware/dmi/entries/1-0/raw";
uint8_t wakeup_type_byte, tablesize;
_cleanup_free_ char *buf = NULL;
size_t bufsize;
int r;
/* implementation via dmi/entries */
r = read_full_virtual_file(dmi_object_path, &buf, &bufsize);
if (r < 0)
return log_debug_errno(r, "Unable to read %s: %m", dmi_object_path);
if (bufsize < 25)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"Only read %zu bytes from %s (expected 25)",
bufsize, dmi_object_path);
/* index 1 stores the size of table */
tablesize = (uint8_t) buf[1];
if (tablesize < 25)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"Table size less than the index[0x18] where waketype byte is available.");
wakeup_type_byte = (uint8_t) buf[24];
/* 0 is Reserved and 8 is AC Power Restored. As per table 12 in
* https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.4.0.pdf */
if (wakeup_type_byte >= 128)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Expected value in range 0-127");
if (wakeup_type_byte == 3) {
log_debug("DMI BIOS System Information indicates wakeup type is APM Timer");
return true;
}
return false;
}
static int custom_timer_suspend(const SleepConfig *sleep_config) {
usec_t hibernate_timestamp;
int r;
assert(sleep_config);
hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
while (battery_is_discharging_and_low() == 0) {
_cleanup_hashmap_free_ Hashmap *last_capacity = NULL, *current_capacity = NULL;
_cleanup_close_ int tfd = -EBADF;
struct itimerspec ts = {};
usec_t suspend_interval;
bool woken_by_timer;
tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
if (tfd < 0)
return log_error_errno(errno, "Error creating timerfd: %m");
/* Store current battery capacity before suspension */
r = fetch_batteries_capacity_by_name(&last_capacity);
if (r < 0)
return log_error_errno(r, "Error fetching battery capacity percentage: %m");
if (hashmap_isempty(last_capacity))
/* In case of no battery, system suspend interval will be set to HibernateDelaySec= or 2 hours. */
suspend_interval = timestamp_is_set(hibernate_timestamp)
? sleep_config->hibernate_delay_usec : DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY;
else {
r = get_total_suspend_interval(last_capacity, &suspend_interval);
if (r < 0) {
log_debug_errno(r, "Failed to estimate suspend interval using previous discharge rate, ignoring: %m");
/* In case of any errors, especially when we do not know the battery
* discharging rate, system suspend interval will be set to
* SuspendEstimationSec=. */
suspend_interval = sleep_config->suspend_estimation_usec;
}
}
/* Do not suspend more than HibernateDelaySec= unless HibernateOnACPower=no and currently on AC power */
if (!sleep_config->hibernate_on_ac_power) {
/* Do not allow "decay" to suspend if the system has no battery. */
if (hashmap_isempty(last_capacity))
log_once(LOG_WARNING, "HibernateOnACPower=no was ignored because the system does not have a battery.");
else if (on_ac_power() > 0)
hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
}
usec_t before_timestamp = now(CLOCK_BOOTTIME);
suspend_interval = MIN(suspend_interval, usec_sub_unsigned(hibernate_timestamp, before_timestamp));
if (suspend_interval <= 0)
break; /* system should hibernate */
log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
/* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */
timespec_store(&ts.it_value, suspend_interval);
if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
return log_error_errno(errno, "Error setting battery estimate timer: %m");
r = execute(sleep_config, SLEEP_SUSPEND, NULL);
if (r < 0)
return r;
r = fd_wait_for_event(tfd, POLLIN, 0);
if (r < 0)
return log_error_errno(r, "Error polling timerfd: %m");
/* Store fd_wait status */
woken_by_timer = FLAGS_SET(r, POLLIN);
r = fetch_batteries_capacity_by_name(&current_capacity);
if (r < 0 || hashmap_isempty(current_capacity)) {
/* In case of no battery or error while getting charge level, no need to measure
* discharge rate. Instead the system should wake up if it is manual wakeup or
* hibernate if this is a timer wakeup. */
if (r < 0)
log_debug_errno(r, "Battery capacity percentage unavailable, cannot estimate discharge rate: %m");
else
log_debug("No battery found.");
if (!woken_by_timer)
return 0;
break;
}
usec_t after_timestamp = now(CLOCK_BOOTTIME);
log_debug("Attempting to estimate battery discharge rate after wakeup from %s sleep",
FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_HOUR));
if (after_timestamp != before_timestamp) {
r = estimate_battery_discharge_rate_per_hour(last_capacity, current_capacity, before_timestamp, after_timestamp);
if (r < 0)
log_warning_errno(r, "Failed to estimate and update battery discharge rate, ignoring: %m");
} else
log_debug("System woke up too early to estimate discharge rate.");
if (!woken_by_timer)
/* Return as manual wakeup done. This also will return in case battery was charged during suspension */
return 0;
r = check_wakeup_type();
if (r > 0) {
log_debug("wakeup type is APM timer");
/* system should hibernate */
break;
}
}
return 1;
}
static int execute_s2h(const SleepConfig *sleep_config) {
_cleanup_close_ int tfd = -EBADF;
usec_t hibernate_timestamp = 0;
int r;
assert(sleep_config);
/* Always check if we have automated battery alarms, regardless of HibernateDelaySec= setting.
* This allows both low-battery hibernation AND timeout-based hibernation to work together. */
r = check_wakeup_type();
if (r < 0)
log_warning_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
else {
r = battery_trip_point_alarm_exists();
if (r < 0)
log_warning_errno(r, "Failed to check whether acpi_btp support is enabled or not, ignoring: %m");
}
if (r > 0) {
/* We have hardware battery alarm support (ACPI _BTP). If HibernateDelaySec= is also set,
* set up an RTC alarm so we hibernate on whichever comes first: low battery or timeout. */
if (timestamp_is_set(sleep_config->hibernate_delay_usec)) {
tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
if (tfd < 0)
return log_error_errno(errno, "Error creating timerfd: %m");
hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
}
for (;;) {
if (tfd >= 0) {
struct itimerspec ts = {};
usec_t time_left;
/* Handle HibernateOnACPower=no: reset timer while on AC power */
if (!sleep_config->hibernate_on_ac_power && on_ac_power() > 0) {
log_debug("On AC power with HibernateOnACPower=no, resetting hibernate timer");
hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
}
time_left = usec_sub_unsigned(hibernate_timestamp, now(CLOCK_BOOTTIME));
if (time_left <= 0)
break; /* Timer expired, hibernate */
log_debug("Set timerfd wake alarm for %s",
FORMAT_TIMESPAN(time_left, USEC_PER_SEC));
timespec_store(&ts.it_value, time_left);
if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
return log_error_errno(errno, "Error setting hibernate delay timer: %m");
}
log_debug("Attempting to suspend...");
r = execute(sleep_config, SLEEP_SUSPEND, NULL);
if (r < 0)
return r;
r = check_wakeup_type();
if (r < 0)
return log_error_errno(r, "Failed to check hardware wakeup type: %m");
if (r > 0) {
/* APM Timer wakeup - this means the battery alarm triggered, hibernate */
log_debug("Woken by APM Timer (battery low), proceeding to hibernate");
break;
}
if (tfd >= 0) {
/* Check if our HibernateDelaySec timer fired */
r = fd_wait_for_event(tfd, POLLIN, 0);
if (r < 0)
return log_error_errno(r, "Error polling timerfd: %m");
if (FLAGS_SET(r, POLLIN)) {
/* Timer fired - but respect HibernateOnACPower setting */
if (!sleep_config->hibernate_on_ac_power && on_ac_power() > 0) {
log_debug("Timer fired but on AC power with HibernateOnACPower=no, continuing suspend");
continue;
}
log_debug("HibernateDelaySec timeout reached, proceeding to hibernate");
break;
}
}
/* Manual wakeup - not battery alarm and not timer */
return 0;
}
} else {
r = custom_timer_suspend(sleep_config);
if (r < 0)
return log_debug_errno(r, "Suspend cycle with manual battery discharge rate estimation failed: %m");
if (r == 0)
/* manual wakeup */
return 0;
}
/* For above custom timer, if 1 is returned, system will directly hibernate */
log_debug("Attempting to hibernate");
r = execute(sleep_config, SLEEP_HIBERNATE, NULL);
if (r < 0) {
log_notice("Couldn't hibernate, will try to suspend again.");
r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hibernate");
if (r < 0)
return r;
}
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-suspend.service", "8", &link);
if (r < 0)
return log_oom();
printf("%s COMMAND\n\n"
"Suspend the system, hibernate the system, or both.\n\n"
" -h --help Show this help and exit\n"
" --version Print version string and exit\n"
"\nCommands:\n"
" suspend Suspend the system\n"
" hibernate Hibernate the system\n"
" hybrid-sleep Both hibernate and suspend the system\n"
" suspend-then-hibernate Initially suspend and then hibernate\n"
" the system after a fixed period of time or\n"
" when battery is low\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (argc - optind != 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Usage: %s COMMAND",
program_invocation_short_name);
arg_operation = sleep_operation_from_string(argv[optind]);
if (arg_operation < 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command '%s'.", argv[optind]);
return 1 /* work to do */;
}
static int run(int argc, char *argv[]) {
_cleanup_(unit_freezer_freep) UnitFreezer *user_slice_freezer = NULL;
_cleanup_(sleep_config_freep) SleepConfig *sleep_config = NULL;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = parse_sleep_config(&sleep_config);
if (r < 0)
return r;
if (!sleep_config->allow[arg_operation])
return log_error_errno(SYNTHETIC_ERRNO(EACCES),
"Sleep operation \"%s\" is disabled by configuration, refusing.",
sleep_operation_to_string(arg_operation));
/* Freeze the user sessions */
r = getenv_bool("SYSTEMD_SLEEP_FREEZE_USER_SESSIONS");
if (r < 0 && r != -ENXIO)
log_warning_errno(r, "Cannot parse value of $SYSTEMD_SLEEP_FREEZE_USER_SESSIONS, ignoring: %m");
if (r != 0) {
r = unit_freezer_new(SPECIAL_USER_SLICE, &user_slice_freezer);
if (r < 0)
return r;
(void) unit_freezer_freeze(user_slice_freezer);
} else
log_notice("User sessions remain unfrozen on explicit request ($SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=0).\n"
"This is not recommended, and might result in unexpected behavior, particularly\n"
"in suspend-then-hibernate operations or setups with encrypted home directories.");
switch (arg_operation) {
case SLEEP_SUSPEND_THEN_HIBERNATE:
r = execute_s2h(sleep_config);
break;
case SLEEP_HYBRID_SLEEP:
r = execute(sleep_config, SLEEP_HYBRID_SLEEP, NULL);
if (r < 0) {
/* If we can't hybrid sleep, then let's try to suspend at least. After all, the user
* asked us to do both: suspend + hibernate, and it's almost certainly the
* hibernation that failed, hence still do the other thing, the suspend. */
log_notice_errno(r, "Couldn't hybrid sleep, will try to suspend instead: %m");
r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hybrid-sleep");
}
break;
case SLEEP_SUSPEND:
case SLEEP_HIBERNATE:
r = execute(sleep_config, arg_operation, NULL);
break;
default:
assert_not_reached();
}
if (user_slice_freezer)
RET_GATHER(r, unit_freezer_thaw(user_slice_freezer));
return r;
}
DEFINE_MAIN_FUNCTION(run);
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