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/* 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);
}
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