/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "state_file.h" #include "audio.h" #include "playlist.h" #include "volume.h" #include <glib.h> #include <assert.h> #include <string.h> #include <errno.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "state_file" static struct _sf_cb { void (*reader)(FILE *); void (*writer)(FILE *); } sf_callbacks [] = { { read_sw_volume_state, save_sw_volume_state }, { readAudioDevicesState, saveAudioDevicesState }, { readPlaylistState, savePlaylistState }, }; static char *state_file_path; /** the GLib source id for the save timer */ static guint save_state_source_id; static void state_file_write(void) { unsigned int i; FILE *fp; if (state_file_path == NULL) return; fp = fopen(state_file_path, "w"); if (G_UNLIKELY(!fp)) { g_warning("failed to create %s: %s", state_file_path, strerror(errno)); return; } for (i = 0; i < G_N_ELEMENTS(sf_callbacks); i++) sf_callbacks[i].writer(fp); while(fclose(fp) && errno == EINTR) /* nothing */; } static void state_file_read(void) { unsigned int i; FILE *fp; assert(state_file_path != NULL); g_debug("Saving state file"); fp = fopen(state_file_path, "r"); if (G_UNLIKELY(!fp)) { g_warning("failed to open %s: %s", state_file_path, strerror(errno)); return; } for (i = 0; i < G_N_ELEMENTS(sf_callbacks); i++) { sf_callbacks[i].reader(fp); rewind(fp); } while(fclose(fp) && errno == EINTR) /* nothing */; } /** * 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) { 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(5 * 60 * 1000, timer_save_state_file, NULL); } void state_file_finish(void) { if (save_state_source_id != 0) g_source_remove(save_state_source_id); if (state_file_path != NULL) state_file_write(); g_free(state_file_path); }