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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
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 <errno.h>
#include <string.h>
#include <getopt.h>
#include "sd-id128.h"
#include "sd-messages.h"
#include "log.h"
#include "util.h"
#include "strv.h"
#include "fileio.h"
#include "build.h"
#include "sleep-config.h"
#include "def.h"
static char* arg_verb = NULL;
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);
if (k == 0)
return 0;
log_debug("Failed to write '%s' to /sys/power/disk: %s",
*mode, strerror(-k));
if (r == 0)
r = k;
}
if (r < 0)
log_error("Failed to write mode to /sys/power/disk: %s",
strerror(-r));
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);
if (k == 0)
return 0;
log_debug("Failed to write '%s' to /sys/power/state: %s",
*state, strerror(-k));
if (r == 0)
r = k;
fclose(*f);
*f = fopen("/sys/power/state", "we");
if (!*f) {
log_error("Failed to open /sys/power/state: %m");
return -errno;
}
}
return r;
}
static int execute(char **modes, char **states) {
char* arguments[4];
int r;
_cleanup_fclose_ FILE *f = NULL;
const char* note = strappenda("SLEEP=", arg_verb);
/* 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) {
log_error("Failed to open /sys/power/state: %m");
return -errno;
}
/* Configure the hibernation mode */
r = write_mode(modes);
if (r < 0)
return r;
arguments[0] = NULL;
arguments[1] = (char*) "pre";
arguments[2] = arg_verb;
arguments[3] = NULL;
execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments, NULL);
log_struct(LOG_INFO,
MESSAGE_ID(SD_MESSAGE_SLEEP_START),
"MESSAGE=Suspending system...",
note,
NULL);
r = write_state(&f, states);
if (r < 0)
return r;
log_struct(LOG_INFO,
MESSAGE_ID(SD_MESSAGE_SLEEP_STOP),
"MESSAGE=System resumed.",
note,
NULL);
arguments[1] = (char*) "post";
execute_directory(SYSTEM_SLEEP_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments, NULL);
return r;
}
static int 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"
, program_invocation_short_name
);
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:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0 /* done */;
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")) {
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;
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);
if (r < 0)
goto finish;
r = execute(modes, states);
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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