/* * Copyright (C) 2003-2010 The Music Player Daemon Project * http://www.musicpd.org * * 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; either version 2 of the License, or * (at your option) any later version. * * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include "state_file.h" #include "output_state.h" #include "playlist.h" #include "playlist_state.h" #include "volume.h" #include "glib_compat.h" #include <glib.h> #include <assert.h> #include <string.h> #include <errno.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "state_file" static char *state_file_path; /** the GLib source id for the save timer */ static guint save_state_source_id; /** * These version numbers determine whether we need to save the state * file. If nothing has changed, we won't let the hard drive spin up. */ static unsigned prev_volume_version, prev_output_version, prev_playlist_version; static void state_file_write(void) { FILE *fp; assert(state_file_path != NULL); g_debug("Saving state file %s", state_file_path); fp = fopen(state_file_path, "w"); if (G_UNLIKELY(!fp)) { g_warning("failed to create %s: %s", state_file_path, strerror(errno)); return; } save_sw_volume_state(fp); audio_output_state_save(fp); playlist_state_save(fp, &g_playlist); while(fclose(fp) && errno == EINTR) /* nothing */; prev_volume_version = sw_volume_state_get_hash(); prev_output_version = audio_output_state_get_version(); prev_playlist_version = playlist_state_get_hash(&g_playlist); } static void state_file_read(void) { FILE *fp; char line[1024]; bool success; assert(state_file_path != NULL); g_debug("Loading state file %s", state_file_path); fp = fopen(state_file_path, "r"); if (G_UNLIKELY(!fp)) { g_warning("failed to open %s: %s", state_file_path, strerror(errno)); return; } while (fgets(line, sizeof(line), fp) != NULL) { g_strchomp(line); success = read_sw_volume_state(line) || audio_output_state_read(line) || playlist_state_restore(line, fp, &g_playlist); if (!success) g_warning("Unrecognized line in state file: %s", line); } while(fclose(fp) && errno == EINTR) /* nothing */; prev_volume_version = sw_volume_state_get_hash(); prev_output_version = audio_output_state_get_version(); prev_playlist_version = playlist_state_get_hash(&g_playlist); } /** * This function is called every 5 minutes by the GLib main loop, and * saves the state file. */ static gboolean timer_save_state_file(G_GNUC_UNUSED gpointer data) { if (prev_volume_version == sw_volume_state_get_hash() && prev_output_version == audio_output_state_get_version() && prev_playlist_version == playlist_state_get_hash(&g_playlist)) /* nothing has changed - don't save the state file, don't spin up the hard disk */ return true; state_file_write(); return true; } void state_file_init(const char *path) { assert(state_file_path == NULL); if (path == NULL) return; state_file_path = g_strdup(path); state_file_read(); save_state_source_id = g_timeout_add_seconds(5 * 60, timer_save_state_file, NULL); } void state_file_finish(void) { if (state_file_path == NULL) /* no state file configured, no cleanup required */ return; if (save_state_source_id != 0) g_source_remove(save_state_source_id); state_file_write(); g_free(state_file_path); }