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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2010-2017 Canonical
Copyright © 2018 Dell Inc.
***/
#include <errno.h>
#include <getopt.h>
#include <linux/fiemap.h>
#include <stdio.h>
#include "sd-messages.h"
#include "def.h"
#include "exec-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "main-func.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "sleep-config.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
static char* arg_verb = NULL;
static int write_hibernate_location_info(void) {
_cleanup_free_ char *device = NULL, *type = NULL;
_cleanup_free_ struct fiemap *fiemap = NULL;
char offset_str[DECIMAL_STR_MAX(uint64_t)];
char device_str[DECIMAL_STR_MAX(uint64_t)];
_cleanup_close_ int fd = -1;
struct stat stb;
uint64_t offset;
int r;
r = find_hibernate_location(&device, &type, NULL, NULL);
if (r < 0)
return log_debug_errno(r, "Unable to find hibernation location: %m");
/* if it's a swap partition, we just write the disk to /sys/power/resume */
if (streq(type, "partition")) {
r = write_string_file("/sys/power/resume", device, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_debug_errno(r, "Faileed to write partitoin device to /sys/power/resume: %m");
return r;
}
if (!streq(type, "file")) {
log_debug("Invalid hibernate type: %s", type);
return -EINVAL;
}
/* Only available in 4.17+ */
if (access("/sys/power/resume_offset", W_OK) < 0) {
if (errno == ENOENT) {
log_debug("Kernel too old, can't configure resume offset, ignoring.");
return 0;
}
return log_debug_errno(errno, "/sys/power/resume_offset not writeable: %m");
}
fd = open(device, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
if (fd < 0)
return log_debug_errno(errno, "Unable to open '%s': %m", device);
r = fstat(fd, &stb);
if (r < 0)
return log_debug_errno(errno, "Unable to stat %s: %m", device);
r = read_fiemap(fd, &fiemap);
if (r < 0)
return log_debug_errno(r, "Unable to read extent map for '%s': %m", device);
if (fiemap->fm_mapped_extents == 0) {
log_debug("No extents found in '%s'", device);
return -EINVAL;
}
offset = fiemap->fm_extents[0].fe_physical / page_size();
xsprintf(offset_str, "%" PRIu64, offset);
r = write_string_file("/sys/power/resume_offset", offset_str, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_debug_errno(r, "Failed to write offset '%s': %m", offset_str);
xsprintf(device_str, "%lx", (unsigned long)stb.st_dev);
r = write_string_file("/sys/power/resume", device_str, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_debug_errno(r, "Failed to write device '%s': %m", device_str);
return 0;
}
static int write_mode(char **modes) {
int r = 0;
char **mode;
STRV_FOREACH(mode, modes) {
int k;
k = write_string_file("/sys/power/disk", *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
if (k >= 0)
return 0;
log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", *mode);
if (r >= 0)
r = k;
}
return r;
}
static int write_state(FILE **f, char **states) {
char **state;
int r = 0;
STRV_FOREACH(state, states) {
int k;
k = write_string_stream(*f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
if (k >= 0)
return 0;
log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state);
if (r >= 0)
r = k;
fclose(*f);
*f = fopen("/sys/power/state", "we");
if (!*f)
return -errno;
}
return r;
}
static int execute(char **modes, char **states) {
char *arguments[] = {
NULL,
(char*) "pre",
arg_verb,
NULL
};
static const char* const dirs[] = {
SYSTEM_SLEEP_PATH,
NULL
};
int r;
_cleanup_fclose_ FILE *f = NULL;
/* This file is opened first, so that if we hit an error,
* we can abort before modifying any state. */
f = fopen("/sys/power/state", "we");
if (!f)
return log_error_errno(errno, "Failed to open /sys/power/state: %m");
setvbuf(f, NULL, _IONBF, 0);
/* Configure the hibernation mode */
if (!strv_isempty(modes)) {
r = write_hibernate_location_info();
if (r < 0)
return log_error_errno(r, "Failed to write hibernation disk offset: %m");
r = write_mode(modes);
if (r < 0)
return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");;
}
execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL);
log_struct(LOG_INFO,
"MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
LOG_MESSAGE("Suspending system..."),
"SLEEP=%s", arg_verb);
r = write_state(&f, states);
if (r < 0)
log_struct_errno(LOG_ERR, r,
"MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
LOG_MESSAGE("Failed to suspend system. System resumed again: %m"),
"SLEEP=%s", arg_verb);
else
log_struct(LOG_INFO,
"MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
LOG_MESSAGE("System resumed."),
"SLEEP=%s", arg_verb);
arguments[1] = (char*) "post";
execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL);
return r;
}
static int rtc_read_time(uint64_t *ret_sec) {
_cleanup_free_ char *t = NULL;
int r;
r = read_one_line_file("/sys/class/rtc/rtc0/since_epoch", &t);
if (r < 0)
return log_error_errno(r, "Failed to read RTC time: %m");
r = safe_atou64(t, ret_sec);
if (r < 0)
return log_error_errno(r, "Failed to parse RTC time '%s': %m", t);
return 0;
}
static int rtc_write_wake_alarm(uint64_t sec) {
char buf[DECIMAL_STR_MAX(uint64_t)];
int r;
xsprintf(buf, "%" PRIu64, sec);
r = write_string_file("/sys/class/rtc/rtc0/wakealarm", buf, WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_error_errno(r, "Failed to write '%s' to /sys/class/rtc/rtc0/wakealarm: %m", buf);
return 0;
}
static int execute_s2h(usec_t hibernate_delay_sec) {
_cleanup_strv_free_ char **hibernate_modes = NULL, **hibernate_states = NULL,
**suspend_modes = NULL, **suspend_states = NULL;
usec_t original_time, wake_time, cmp_time;
int r;
r = parse_sleep_config("suspend", NULL, &suspend_modes, &suspend_states, NULL);
if (r < 0)
return r;
r = parse_sleep_config("hibernate", NULL, &hibernate_modes, &hibernate_states, NULL);
if (r < 0)
return r;
r = rtc_read_time(&original_time);
if (r < 0)
return r;
wake_time = original_time + DIV_ROUND_UP(hibernate_delay_sec, USEC_PER_SEC);
r = rtc_write_wake_alarm(wake_time);
if (r < 0)
return r;
log_debug("Set RTC wake alarm for %" PRIu64, wake_time);
r = execute(suspend_modes, suspend_states);
if (r < 0)
return r;
/* Reset RTC right-away */
r = rtc_write_wake_alarm(0);
if (r < 0)
return r;
r = rtc_read_time(&cmp_time);
if (r < 0)
return r;
log_debug("Woke up at %"PRIu64, cmp_time);
if (cmp_time < wake_time) /* We woke up before the alarm time, we are done. */
return 0;
/* If woken up after alarm time, hibernate */
r = execute(hibernate_modes, hibernate_states);
if (r < 0) {
log_notice("Couldn't hibernate, will try to suspend again.");
r = execute(suspend_modes, suspend_states);
if (r < 0) {
log_notice("Could neither hibernate nor suspend again, giving up.");
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\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("Unhandled option");
}
if (argc - optind != 1) {
log_error("Usage: %s COMMAND",
program_invocation_short_name);
return -EINVAL;
}
arg_verb = argv[optind];
if (!STR_IN_SET(arg_verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate")) {
log_error("Unknown command '%s'.", arg_verb);
return -EINVAL;
}
return 1 /* work to do */;
}
static int run(int argc, char *argv[]) {
bool allow;
_cleanup_strv_free_ char **modes = NULL, **states = NULL;
usec_t delay = 0;
int r;
log_setup_service();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = parse_sleep_config(arg_verb, &allow, &modes, &states, &delay);
if (r < 0)
return r;
if (!allow) {
log_error("Sleep mode \"%s\" is disabled by configuration, refusing.", arg_verb);
return -EACCES;
}
if (streq(arg_verb, "suspend-then-hibernate"))
return execute_s2h(delay);
else
return execute(modes, states);
}
DEFINE_MAIN_FUNCTION(run);
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