/* 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 "parse-util.h"
#include "def.h"
#include "exec-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.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"))
return write_string_file("/sys/power/resume", device, 0);
else if (!streq(type, "file"))
return log_debug_errno(EINVAL, "Invalid hibernate type %s: %m",
type);
/* Only available in 4.17+ */
if (access("/sys/power/resume_offset", F_OK) < 0) {
if (errno == ENOENT)
return 0;
return log_debug_errno(errno, "/sys/power/resume_offset unavailable: %m");
}
r = access("/sys/power/resume_offset", W_OK);
if (r < 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, 0);
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, 0);
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, 0);
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, 0);
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");
/* 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);
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)
return log_error_errno(r, "Failed to write /sys/power/state: %m");
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);
return r;
}
static int read_wakealarm(uint64_t *result) {
_cleanup_free_ char *t = NULL;
if (read_one_line_file("/sys/class/rtc/rtc0/since_epoch", &t) >= 0)
return safe_atou64(t, result);
return -EBADF;
}
static int write_wakealarm(const char *str) {
_cleanup_fclose_ FILE *f = NULL;
int r;
f = fopen("/sys/class/rtc/rtc0/wakealarm", "we");
if (!f)
return log_error_errno(errno, "Failed to open /sys/class/rtc/rtc0/wakealarm: %m");
r = write_string_stream(f, str, 0);
if (r < 0)
return log_error_errno(r, "Failed to write '%s' to /sys/class/rtc/rtc0/wakealarm: %m", str);
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 orig_time, cmp_time;
char time_str[DECIMAL_STR_MAX(uint64_t)];
int r;
r = parse_sleep_config("suspend", &suspend_modes, &suspend_states,
NULL);
if (r < 0)
return r;
r = parse_sleep_config("hibernate", &hibernate_modes,
&hibernate_states, NULL);
if (r < 0)
return r;
r = read_wakealarm(&orig_time);
if (r < 0)
return log_error_errno(errno, "Failed to read time: %d", r);
orig_time += hibernate_delay_sec / USEC_PER_SEC;
xsprintf(time_str, "%" PRIu64, orig_time);
r = write_wakealarm(time_str);
if (r < 0)
return r;
log_debug("Set RTC wake alarm for %s", time_str);
r = execute(suspend_modes, suspend_states);
if (r < 0)
return r;
r = read_wakealarm(&cmp_time);
if (r < 0)
return log_error_errno(errno, "Failed to read time: %d", r);
/* reset RTC */
r = write_wakealarm("0");
if (r < 0)
return r;
log_debug("Woke up at %"PRIu64, cmp_time);
/* if woken up after alarm time, hibernate */
if (cmp_time >= orig_time)
r = execute(hibernate_modes, hibernate_states);
return r;
}
static void help(void) {
printf("%s COMMAND\n\n"
"Suspend the system, hibernate the system, or both.\n\n"
"Commands:\n"
" -h --help Show this help and exit\n"
" --version Print version string and exit\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"
, program_invocation_short_name);
}
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':
help();
return 0; /* done */
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 (!streq(arg_verb, "suspend") &&
!streq(arg_verb, "hibernate") &&
!streq(arg_verb, "hybrid-sleep") &&
!streq(arg_verb, "suspend-then-hibernate")) {
log_error("Unknown command '%s'.", arg_verb);
return -EINVAL;
}
return 1 /* work to do */;
}
int main(int argc, char *argv[]) {
_cleanup_strv_free_ char **modes = NULL, **states = NULL;
usec_t delay = 0;
int r;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
r = parse_sleep_config(arg_verb, &modes, &states, &delay);
if (r < 0)
goto finish;
if (streq(arg_verb, "suspend-then-hibernate"))
r = execute_s2h(delay);
else
r = execute(modes, states);
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}