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/*
* 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[] = "/var/lock/battery_tool_powerd.lock";
int disable_power_management()
{
FILE *lock_file;
int rc = 0;
lock_file = fopen(lock_file_path, "w");
if (!lock_file) {
printf("%s: Failed to open %s for writing: %s\n",
__func__, lock_file_path, strerror(errno));
return 1;
}
if (fprintf(lock_file, "%ld", (long)getpid()) < 0) {
printf("%s: Failed to write PID to %s: %s\n",
__func__, lock_file_path, strerror(errno));
rc = 1;
}
if (fclose(lock_file) != 0) {
printf("%s: Failed to close %s: %s\n",
__func__, lock_file_path, strerror(errno));
}
return rc;
}
int restore_power_management()
{
int result = 0;
result = unlink(lock_file_path);
if (result != 0 && errno != ENOENT) {
printf("%s: Failed to unlink %s: %s\n",
__func__, lock_file_path, strerror(errno));
return 1;
}
return 0;
}
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