64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
|
/*
|
||
|
|
* This file is ported from the flashrom project.
|
||
|
|
*
|
||
|
|
* Copyright 2015 The Chromium OS Authors. All rights reserved.
|
||
|
|
* Use of this source code is governed by a BSD-style license that can be
|
||
|
|
* found in the LICENSE file.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; version 2 of the License.
|
||
|
|
*
|
||
|
|
* This program 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 General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*
|
||
|
|
* powerd_lock.c: power management routines
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include "powerd_lock.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Path to a file containing flashrom's PID. While present, powerd avoids
|
||
|
|
* suspending or shutting down the system.
|
||
|
|
*/
|
||
|
|
static const char lock_file_path[] =
|
||
|
|
"/run/lock/power_override/battery_tool.lock";
|
||
|
|
|
||
|
|
int disable_power_management()
|
||
|
|
{
|
||
|
|
FILE *lock_file;
|
||
|
|
int rc = 0;
|
||
|
|
lock_file = fopen(lock_file_path, "w");
|
||
|
|
if (!lock_file)
|
||
|
|
return POWERD_CREATE_LOCK_FILE_ERROR;
|
||
|
|
|
||
|
|
if (fprintf(lock_file, "%ld", (long)getpid()) < 0)
|
||
|
|
rc = POWERD_WRITE_LOCK_FILE_ERROR;
|
||
|
|
|
||
|
|
if (fclose(lock_file) != 0)
|
||
|
|
rc |= POWERD_CLOSE_LOCK_FILE_ERROR;
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int restore_power_management()
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
result = unlink(lock_file_path);
|
||
|
|
if (result != 0 && errno != ENOENT)
|
||
|
|
return POWERD_DELETE_LOCK_FILE_ERROR;
|
||
|
|
return 0;
|
||
|
|
}
|