| /* |
| * This file is part of the flashrom project. |
| * |
| * Copyright (C) 2011 The Chromium OS Authors |
| * |
| * 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 |
| * |
| * power.c: power management routines |
| */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "flash.h" /* for msg_* */ |
| #include "locks.h" /* for SYSTEM_LOCKFILE_DIR */ |
| #include "power.h" |
| |
| /* |
| * Path to a file containing flashrom's PID. While present, powerd avoids |
| * suspending or shutting down the system. |
| */ |
| static const char powerd_lock_file_name[] = "flashrom_powerd.lock"; |
| |
| int disable_power_management() |
| { |
| FILE *lock_file = NULL; |
| int rc = 0; |
| char lock_file_path[PATH_MAX]; |
| |
| msg_pdbg("%s: Disabling power management.\n", __func__); |
| |
| if (snprintf(lock_file_path, sizeof(lock_file_path), "%s/%s", |
| SYSTEM_LOCKFILE_DIR, powerd_lock_file_name) < 0) |
| return 1; |
| |
| if (!(lock_file = fopen(lock_file_path, "w"))) { |
| msg_perr("%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) { |
| msg_perr("%s: Failed to write PID to %s: %s\n", |
| __func__, lock_file_path, strerror(errno)); |
| rc = 1; |
| } |
| |
| if (fclose(lock_file) != 0) { |
| msg_perr("%s: Failed to close %s: %s\n", |
| __func__, lock_file_path, strerror(errno)); |
| } |
| return rc; |
| |
| } |
| |
| int restore_power_management() |
| { |
| int result = 0; |
| char lock_file_path[PATH_MAX]; |
| |
| msg_pdbg("%s: Re-enabling power management.\n", __func__); |
| |
| if (snprintf(lock_file_path, sizeof(lock_file_path), "%s/%s", |
| SYSTEM_LOCKFILE_DIR, powerd_lock_file_name) < 0) |
| return 1; |
| |
| result = unlink(lock_file_path); |
| if (result != 0 && errno != ENOENT) { |
| msg_perr("%s: Failed to unlink %s: %s\n", |
| __func__, lock_file_path, strerror(errno)); |
| return 1; |
| } |
| return 0; |
| } |