From be42949a4fadd368fc75e8f688b1b309a69051de Mon Sep 17 00:00:00 2001 From: Sheng-Liang Song Date: Wed, 18 Mar 2015 10:28:00 -0700 Subject: sb_firmware: write PID to lockfile for powerd Add logic to write PID to /var/lock/battery_tool_powerd.lock while performing destructive battery firmware update actions. BUG=chrome-os-partner:36310 BRANCH=none CQ-DEPEND=CL:261318 TEST=Verified on glimmer. Change-Id: I47f34a3a2cb890e66591ef16ac5cf7186d662900 Signed-off-by: Sheng-Liang Song Reviewed-on: https://chromium-review.googlesource.com/260868 Reviewed-by: Shawn N --- util/powerd_lock.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 util/powerd_lock.c (limited to 'util/powerd_lock.c') diff --git a/util/powerd_lock.c b/util/powerd_lock.c new file mode 100644 index 0000000000..632bae069a --- /dev/null +++ b/util/powerd_lock.c @@ -0,0 +1,76 @@ +/* + * 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 +#include +#include +#include +#include +#include + +#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; +} -- cgit v1.2.1