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authorEric Wong <normalperson@yhbt.net>2006-07-30 23:32:47 +0000
committerEric Wong <normalperson@yhbt.net>2006-07-30 23:32:47 +0000
commit12aec5738b8333a0dd676871bbfb6d6762ea87a5 (patch)
treeb2bb99e19e6a771f01bb465f38f4d878d6a9d805 /src/state_file.c
parent381d7232a0d63c0a145fae5e2c40e577ff2f44f1 (diff)
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Standardize state_file handling routines.
This way it's easier to manage and extend. git-svn-id: https://svn.musicpd.org/mpd/trunk@4494 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to '')
-rw-r--r--src/state_file.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/state_file.c b/src/state_file.c
new file mode 100644
index 000000000..1307faa54
--- /dev/null
+++ b/src/state_file.c
@@ -0,0 +1,112 @@
+/* the Music Player Daemon (MPD)
+ * (c)2003-2006 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 "../config.h"
+#include "state_file.h"
+#include "conf.h"
+#include "gcc.h"
+#include "log.h"
+#include "audio.h"
+#include "playlist.h"
+#include "utils.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+static struct _sf_cb {
+ void (*reader)(FILE *);
+ void (*writer)(FILE *);
+} sf_callbacks [] = {
+ { readAudioDevicesState, saveAudioDevicesState },
+ { readPlaylistState, savePlaylistState },
+};
+
+static const char *sfpath = NULL;
+
+static void get_state_file_path(void)
+{
+ ConfigParam *param;
+ if (sfpath)
+ return;
+ param = parseConfigFilePath(CONF_STATE_FILE, 0);
+ if (param)
+ sfpath = (const char *)param->value;
+}
+
+void write_state_file(void)
+{
+ int i;
+ FILE *fp;
+
+ if (!sfpath)
+ return;
+ while (!(fp = fopen(sfpath, "w")) && errno == EINTR);
+
+ if (mpd_unlikely(!fp)) {
+ ERROR("problems opening state file \"%s\" for writing: %s\n",
+ sfpath, strerror(errno));
+ return;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sf_callbacks); i++)
+ sf_callbacks[i].writer(fp);
+
+ while(fclose(fp) && errno == EINTR) /* nothing */;
+}
+
+void read_state_file(void)
+{
+ struct stat st;
+ int i;
+ FILE *fp;
+
+ get_state_file_path();
+ if (!sfpath)
+ return;
+ if (stat(sfpath, &st) < 0) {
+ DEBUG("failed to stat state file: %s\n", sfpath);
+ return;
+ }
+ if (!S_ISREG(st.st_mode)) {
+ ERROR("state file \"%s\" is not a regular file\n", sfpath);
+ exit(EXIT_FAILURE);
+ }
+
+ while (!(fp = fopen(sfpath, "r")) && errno == EINTR);
+ if (mpd_unlikely(!fp)) {
+ ERROR("problems opening state file \"%s\" for reading: %s\n",
+ sfpath, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ for (i = 0; i < ARRAY_SIZE(sf_callbacks); i++) {
+ sf_callbacks[i].reader(fp);
+ rewind(fp);
+ }
+
+ while(fclose(fp) && errno == EINTR) /* nothing */;
+}
+
+void mpd_noreturn state_file_fatal(void)
+{
+ ERROR("error parsing state file \"%s\"\n", sfpath);
+ exit(EXIT_FAILURE);
+}
+