X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod.c;h=6fd8eef15a5b3c5f0c07c16795155daa63691ddc;hp=032f9cd0743a85a492b5cb446ebc965dc3b2cb1f;hb=3e3c069366dbb2bf8f157ad0a406bda67dd51783;hpb=30a64ad83ffc0e815cb135b0587ebf5a1f9af081

diff --git a/audiod.c b/audiod.c
index 032f9cd0..6fd8eef1 100644
--- a/audiod.c
+++ b/audiod.c
@@ -1,35 +1,24 @@
 /*
- * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
+ * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.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, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file audiod.c the paraslash's audio daemon */
+#include <sys/types.h>
+#include <dirent.h>
 
 #include "para.h"
-
+#include "error.h"
 #include "audiod.cmdline.h"
 #include "list.h"
-#include "close_on_fork.h"
 #include "sched.h"
 #include "recv.h"
 #include "filter.h"
 #include "grab_client.cmdline.h"
 #include "grab_client.h"
-
-#include "error.h"
+#include "client.cmdline.h"
+#include "client.h"
 #include "audiod.h"
 #include "net.h"
 #include "daemon.h"
@@ -37,13 +26,14 @@
 #include "fd.h"
 #include "write.h"
 #include "write_common.h"
+#include "signal.h"
 
 /** define the array of error lists needed by para_audiod */
 INIT_AUDIOD_ERRLISTS;
 /** define the array containing all supported audio formats */
-DEFINE_AUDIO_FORMAT_ARRAY;
+const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
 
-/** defines how to handle one supported audio format */
+/** Defines how audiod handles one supported audio format. */
 struct audio_format_info {
 	/** pointer to the receiver for this audio format */
 	struct receiver *receiver;
@@ -65,12 +55,28 @@ struct audio_format_info {
 	struct timeval restart_barrier;
 };
 
+/**
+ * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
+ * be associated with a receiver/filter/writer triple. This array holds all
+ * information on the status of these slots.
+ *
+ * \sa struct slot_info
+ * */
 struct slot_info slot[MAX_STREAM_SLOTS];
 
 
+/**
+ * the current mode of operation of which can be changed by the on/off/cycle
+ * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
+ */
 int audiod_status = AUDIOD_ON;
 
-struct gengetopt_args_info conf;
+/**
+ * the gengetopt args_info struct that holds information on all command line
+ * arguments
+ */
+struct audiod_args_info conf;
+
 static char *socket_name;
 static FILE *logfile;
 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
@@ -78,7 +84,14 @@ static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 
 static struct status_task status_task_struct;
+
+/**
+ * the task that calls the status command of para_server
+ *
+ * \sa struct status_task
+ */
 struct status_task *stat_task = &status_task_struct;
+static struct timeval initial_delay_barrier;
 
 /**
  * the task for handling audiod commands
@@ -92,12 +105,6 @@ struct command_task {
 	struct task task;
 };
 
-struct signal_task {
-	int fd;
-	int signum;
-	struct task task;
-};
-
 /** iterate over all supported audio formats */
 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 
@@ -111,14 +118,20 @@ struct signal_task {
 int get_audio_format_num(char *name)
 {
 	int i;
+
+	while (para_isspace(*name))
+		name++;
 	FOR_EACH_AUDIO_FORMAT(i)
 		if (!strcmp(name, audio_formats[i]))
 			return i;
 	return -E_UNSUPPORTED_AUDIO_FORMAT;
 }
 
-/*
- * log function. first argument is loglevel.
+/**
+ * the log function of para_audiod
+ *
+ * \param ll loglevel
+ * \param fmt the format string
  */
 void para_log(int ll, const char* fmt,...)
 {
@@ -131,6 +144,8 @@ void para_log(int ll, const char* fmt,...)
 
 	if (ll < conf.loglevel_arg)
 		return;
+	if (!logfile && conf.daemon_given)
+		return;
 	if (!hostname)
 		hostname = para_hostname();
 	outfd = logfile? logfile : stderr;
@@ -147,14 +162,14 @@ void para_log(int ll, const char* fmt,...)
 
 static char *configfile_exists(void)
 {
-	static char *config_file;
-
-	if (!config_file) {
-		char *home = para_homedir();
-		config_file = make_message("%s/.paraslash/audiod.conf", home);
-		free(home);
-	}
-	return file_exists(config_file)? config_file : NULL;
+	char *home = para_homedir();
+	char *config_file = make_message("%s/.paraslash/audiod.conf",
+		home);
+	free(home);
+	if (file_exists(config_file))
+		return config_file;
+	free(config_file);
+	return NULL;
 }
 
 static void setup_signal_handling(void)
@@ -163,10 +178,8 @@ static void setup_signal_handling(void)
 	PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 	para_install_sighandler(SIGINT);
 	para_install_sighandler(SIGTERM);
-	para_install_sighandler(SIGCHLD);
 	para_install_sighandler(SIGHUP);
-	para_install_sighandler(SIGPIPE);
-//	signal(SIGPIPE, SIG_IGN);
+	signal(SIGPIPE, SIG_IGN);
 }
 
 static void clear_slot(int slot_num)
@@ -182,43 +195,38 @@ static void close_receiver(int slot_num)
 {
 	struct slot_info *s = &slot[slot_num];
 	struct audio_format_info *a;
-	const struct timeval restart_delay = {0, 200 * 1000};
 
 	if (s->format < 0 || !s->receiver_node)
 		return;
 	a = &afi[s->format];
-	PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
-		audio_formats[s->format] , slot_num, s->receiver_node->eof);
-//	if (!s->receiver_node->eof)
-//		unregister_task(&s->receiver_node->task);
+	PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
+		audio_formats[s->format], slot_num);
 	a->receiver->close(s->receiver_node);
 	free(s->receiver_node);
 	s->receiver_node = NULL;
-	/* set restart barrier */
-	tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 }
 
-static void kill_all_decoders(void)
+static void kill_all_decoders(int error)
 {
 	int i;
 
 	FOR_EACH_SLOT(i) {
 		struct slot_info *s = &slot[i];
-		if (s->wng && !s->wng->eof) {
+		if (s->wng && !s->wng->error) {
 			PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 				i);
 			wng_unregister(s->wng);
-			s->wng->eof = 1;
+			s->wng->error = error;
 		}
-		if (s->fc && !s->fc->eof) {
+		if (s->fc && !s->fc->error) {
 			PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 			unregister_task(&s->fc->task);
-			s->fc->eof = 1;
+			s->fc->error = error;
 		}
-		if (s->receiver_node && !s->receiver_node->eof) {
+		if (s->receiver_node && !s->receiver_node->error) {
 			PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 			unregister_task(&s->receiver_node->task);
-			s->receiver_node->eof = 1;
+			s->receiver_node->error = error;
 		}
 	}
 }
@@ -242,57 +250,6 @@ static int get_empty_slot(void)
 	return -E_NO_MORE_SLOTS;
 }
 
-static int decoder_running(int format)
-{
-	int i, ret = 0;
-	struct slot_info *s;
-
-	FOR_EACH_SLOT(i) {
-		s = &slot[i];
-		if (s->format == format && s->receiver_node)
-			ret |= 1;
-		if (s->format == format && s->wng)
-			ret |= 2;
-	}
-	return ret;
-}
-
-static void close_stat_pipe(void)
-{
-	int i;
-
-	if (stat_task->fd < 0)
-		return;
-	PARA_NOTICE_LOG("%s", "closing status pipe\n");
-	close(stat_task->fd);
-	del_close_on_fork_list(stat_task->fd);
-	stat_task->fd = -1;
-//	kill_all_decoders();
-	for (i = 0; i < NUM_STAT_ITEMS; i++) {
-		free(stat_task->stat_item_values[i]);
-		stat_task->stat_item_values[i] = NULL;
-	}
-	dump_empty_status();
-	stat_task->length_seconds = 0;
-	stat_task->offset_seconds = 0;
-	audiod_status_dump();
-	stat_task->playing = 0;
-	stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
-		"%s:no connection to para_server\n",
-		status_item_list[SI_STATUS_BAR]);
-	stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
-}
-
-void __noreturn clean_exit(int status, const char *msg)
-{
-	PARA_EMERG_LOG("%s\n", msg);
-	if (socket_name)
-		unlink(socket_name);
-	if (stat_task->fd >= 0)
-		close_stat_pipe();
-	exit(status);
-}
-
 /**
  * get the number of filters
  *
@@ -309,9 +266,9 @@ int num_filters(int audio_format_num)
 
 static void filter_event_handler(struct task *t)
 {
-	PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+	PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 	struct filter_chain *fc = t->private_data;
-	fc->eof = 1;
+	fc->error = t->ret;
 	unregister_task(t);
 }
 
@@ -330,13 +287,13 @@ static void open_filters(int slot_num)
 	INIT_LIST_HEAD(&s->fc->filters);
 	s->fc->inbuf = s->receiver_node->buf;
 	s->fc->in_loaded = &s->receiver_node->loaded;
-	s->fc->input_eof = &s->receiver_node->eof;
+	s->fc->input_error = &s->receiver_node->error;
 	s->fc->task.pre_select = filter_pre_select;
 	s->fc->task.event_handler = filter_event_handler;
 	s->fc->task.private_data = s->fc;
-	s->fc->eof = 0;
+	s->fc->error = 0;
 
-	s->receiver_node->output_eof = &s->fc->eof;
+	s->receiver_node->output_error = &s->fc->error;
 	sprintf(s->fc->task.status, "filter chain");
 	for (i = 0; i < nf; i++) {
 		struct filter_node *fn = para_calloc(sizeof(struct filter_node));
@@ -359,8 +316,8 @@ static void wng_event_handler(struct task *t)
 {
 	struct writer_node_group *wng = t->private_data;
 
-	PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
-	wng->eof = 1;
+	PARA_INFO_LOG("%s\n", para_strerror(-t->ret));
+	wng->error = t->ret;
 	wng_unregister(wng);
 }
 
@@ -378,15 +335,15 @@ static void open_writers(int slot_num)
 	if (s->fc) {
 		s->wng->buf = s->fc->outbuf;
 		s->wng->loaded = s->fc->out_loaded;
-		s->wng->input_eof = &s->fc->eof;
+		s->wng->input_error = &s->fc->error;
 		s->wng->channels = &s->fc->channels;
 		s->wng->samplerate = &s->fc->samplerate;
-		s->fc->output_eof = &s->wng->eof;
+		s->fc->output_error = &s->wng->error;
 		PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 	} else {
 		s->wng->buf = s->receiver_node->buf;
 		s->wng->loaded = &s->receiver_node->loaded;
-		s->wng->input_eof = &s->receiver_node->eof;
+		s->wng->input_error = &s->receiver_node->error;
 	}
 	s->wng->task.event_handler = wng_event_handler;
 	for (i = 0; i < a->num_writers; i++) {
@@ -395,7 +352,7 @@ static void open_writers(int slot_num)
 	}
 	ret = wng_open(s->wng);
 	if (ret < 0) {
-		PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 		return;
 	}
 	s->wstime = *now;
@@ -405,22 +362,35 @@ static void open_writers(int slot_num)
 static void rn_event_handler(struct task *t)
 {
 	struct receiver_node *rn = t->private_data;
+	int i;
 
-	PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
+	PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 	unregister_task(t);
-	rn->eof = 1;
+	rn->error = t->ret;
+	/* set restart barrier */
+	FOR_EACH_SLOT(i) {
+		struct timeval restart_delay = {0, 10 * 1000};
+		if (slot[i].receiver_node != rn)
+			continue;
+		if (rn->error != -E_RECV_EOF)
+			/* don't reconnect immediately on errors */
+			restart_delay.tv_sec = 5;
+		tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
+	}
 }
 
-static void open_receiver(int format)
+static int open_receiver(int format)
 {
 	struct audio_format_info *a = &afi[format];
 	struct slot_info *s;
 	int ret, slot_num;
 	struct receiver_node *rn;
+	const struct timeval restart_delay = {1, 0};
 
-	slot_num = get_empty_slot();
-	if (slot_num < 0)
-		clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
+	ret = get_empty_slot();
+	if (ret < 0)
+		goto err;
+	slot_num = ret;
 	s = &slot[slot_num];
 	s->format = format;
 	s->receiver_node = para_calloc(sizeof(struct receiver_node));
@@ -429,11 +399,9 @@ static void open_receiver(int format)
 	rn->conf = a->receiver_conf;
 	ret = a->receiver->open(s->receiver_node);
 	if (ret < 0) {
-		PARA_ERROR_LOG("failed to open receiver (%s)\n",
-			PARA_STRERROR(-ret));
 		free(s->receiver_node);
 		s->receiver_node = NULL;
-		return;
+		goto err;
 	}
 	PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 		audio_formats[s->format], a->receiver->name, slot_num);
@@ -443,36 +411,52 @@ static void open_receiver(int format)
 	rn->task.event_handler = rn_event_handler;
 	sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 	register_task(&rn->task);
+	return 1;
+err:
+	PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	tv_add(now, &restart_delay, &afi[format].restart_barrier);
+	return ret;
 }
 
-static int open_current_receiver(struct sched *s)
+static int receiver_running(int format)
 {
 	int i;
+
+	FOR_EACH_SLOT(i) {
+		struct slot_info *s = &slot[i];
+		if (s->format == format && s->receiver_node
+				&& !s->receiver_node->error)
+			return 1;
+	}
+	return 0;
+}
+
+static int open_current_receiver(struct sched *s)
+{
 	struct timeval diff;
+	int cafn = stat_task->current_audio_format_num;
 
-	if (!stat_task->af_status)
+	if (cafn < 0 || !stat_task->pcd)
 		return 0;
-	i = get_audio_format_num(stat_task->af_status);
-	if (i < 0)
+	if (receiver_running(cafn))
 		return 0;
-	if (decoder_running(i))
-		return 0;
-	if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
+	if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 		s->timeout = diff;
 		return 0;
 	}
-	open_receiver(i);
-	return 1;
+	return open_receiver(cafn) < 0? 0 : 1;
 }
 
-static void compute_time_diff(const struct timeval *status_time)
+static unsigned compute_time_diff(const struct timeval *status_time)
 {
 	struct timeval tmp, diff;
-	static int count;
+	static unsigned count;
 	int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 	const struct timeval max_deviation = {0, 500 * 1000};
 	const int time_smooth = 5;
 
+	if (!status_time)
+		return count;
 	sign = tv_diff(status_time, now, &diff);
 //		PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 //			sign, sa_time_diff_sign);
@@ -480,7 +464,7 @@ static void compute_time_diff(const struct timeval *status_time)
 		sa_time_diff_sign = sign;
 		stat_task->sa_time_diff = diff;
 		count++;
-		return;
+		goto out;
 	}
 	if (count > 5) {
 		int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
@@ -494,15 +478,18 @@ static void compute_time_diff(const struct timeval *status_time)
 		count > 10? sign : sign * time_smooth, &diff,
 		&tmp);
 	stat_task->sa_time_diff = tmp;
-	PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
+	PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 		sign > 0? "+" : "-",
 		tv2ms(&diff),
 		sa_time_diff_sign ? "+" : "-",
 		tv2ms(&stat_task->sa_time_diff)
 	);
+out:
+	stat_task->sa_time_diff_sign = sa_time_diff_sign;
+	return count;
 }
 
-static void check_stat_line(char *line)
+static int check_stat_line(char *line, __a_unused void *data)
 {
 	int itemnum;
 	size_t ilen = 0;
@@ -511,12 +498,14 @@ static void check_stat_line(char *line)
 
 //	PARA_INFO_LOG("line: %s\n", line);
 	if (!line)
-		return;
+		return 1;
 	itemnum = stat_line_valid(line);
 	if (itemnum < 0) {
 		PARA_WARNING_LOG("invalid status line: %s\n", line);
-		return;
+		return 1;
 	}
+	if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
+		return 1;
 	tmp = make_message("%s\n", line);
 	stat_client_write(tmp, itemnum);
 	free(tmp);
@@ -527,20 +516,28 @@ static void check_stat_line(char *line)
 	case SI_STATUS:
 		stat_task->playing = strstr(line, "playing")? 1 : 0;
 		break;
-	case SI_FORMAT:
-		free(stat_task->af_status);
-		stat_task->af_status = para_strdup(line + ilen + 1);
-		break;
 	case SI_OFFSET:
 		stat_task->offset_seconds = atoi(line + ilen + 1);
 		break;
-	case SI_LENGTH:
+	case SI_SECONDS_TOTAL:
 		stat_task->length_seconds = atoi(line + ilen + 1);
 		break;
 	case SI_STREAM_START:
 		if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
+			struct timeval a_start, delay;
+			delay.tv_sec = conf.stream_delay_arg / 1000;
+			delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 			stat_task->server_stream_start.tv_sec = sec;
 			stat_task->server_stream_start.tv_usec = usec;
+			if (compute_time_diff(NULL) > 2) {
+				if (stat_task->sa_time_diff_sign < 0)
+					tv_add(&stat_task->server_stream_start,
+						&stat_task->sa_time_diff, &a_start);
+				else
+					tv_diff(&stat_task->server_stream_start,
+						&stat_task->sa_time_diff, &a_start);
+				tv_add(&a_start, &delay, &initial_delay_barrier);
+			}
 		}
 		break;
 	case SI_CURRENT_TIME:
@@ -548,27 +545,14 @@ static void check_stat_line(char *line)
 			struct timeval tv = {sec, usec};
 			compute_time_diff(&tv);
 		}
+		if (stat_task->clock_diff_count)
+			stat_task->clock_diff_count--;
 		break;
+	case SI_FORMAT:
+		stat_task->current_audio_format_num = get_audio_format_num(
+			line + ilen + 1);
 	}
-}
-
-static void handle_signal(int sig)
-{
-	switch (sig) {
-	case SIGCHLD:
-		for (;;) {
-			pid_t pid = para_reap_child();
-			if (pid <= 0)
-				return;
-			PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
-		}
-	case SIGINT:
-	case SIGTERM:
-	case SIGHUP:
-		PARA_EMERG_LOG("terminating on signal %d\n", sig);
-		clean_exit(EXIT_FAILURE, "caught deadly signal");
-		return;
-	}
+	return 1;
 }
 
 static void try_to_close_slot(int slot_num)
@@ -577,13 +561,13 @@ static void try_to_close_slot(int slot_num)
 
 	if (s->format < 0)
 		return;
-	if (s->receiver_node && !s->receiver_node->eof)
+	if (s->receiver_node && !s->receiver_node->error)
 		return;
-	if (s->fc && !s->fc->eof)
+	if (s->fc && !s->fc->error)
 		return;
-	if (s->wng && !s->wng->eof)
+	if (s->wng && !s->wng->error)
 		return;
-	PARA_INFO_LOG("closing slot %d \n", slot_num);
+	PARA_INFO_LOG("closing slot %d\n", slot_num);
 	wng_close(s->wng);
 	close_filters(s->fc);
 	free(s->fc);
@@ -593,7 +577,7 @@ static void try_to_close_slot(int slot_num)
 
 /*
  * Check if any receivers/filters/writers need to be started and do so if
- * neccessary.  Since the pre_select function didn't have a chance yet to put
+ * necessary.  Since the pre_select function didn't have a chance yet to put
  * file descriptors into the fd sets given by s, make the upcoming select()
  * return immediately to avoid a long timeout in case we started something.
  */
@@ -604,18 +588,21 @@ static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 
 	t->ret = 1;
 	if (audiod_status != AUDIOD_ON || !stat_task->playing)
-		return kill_all_decoders();
+		return kill_all_decoders(-E_NOT_PLAYING);
 	if (open_current_receiver(s))
 		s->timeout = min_delay;
 	FOR_EACH_SLOT(i) {
 		struct slot_info *sl = &slot[i];
 		struct audio_format_info *a;
+		struct timeval diff;
 
 		if (sl->format < 0)
 			continue;
 		a = &afi[sl->format];
 		if (!sl->receiver_node)
 			continue;
+		if ((!a->num_filters || sl->fc) && sl->wng)
+			continue; /* everything already started */
 		if (!a->num_filters) {
 			if (sl->receiver_node->loaded && !sl->wng) {
 				open_writers(i);
@@ -628,9 +615,16 @@ static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 			s->timeout = min_delay;
 			continue;
 		}
-		if (sl->fc && *sl->fc->out_loaded && !sl->wng) {
+		if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
+			continue;
+		if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 			open_writers(i);
 			s->timeout = min_delay;
+			continue;
+		}
+		PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
+		if (tv_diff(&s->timeout, &diff, NULL) > 0) {
+			s->timeout = diff;
 		}
 	}
 }
@@ -640,7 +634,6 @@ static void audiod_post_select(__a_unused struct sched *s,
 {
 	int i;
 
-	/* save away the current time for other users */
 	t->ret = 1;
 	FOR_EACH_SLOT(i)
 		try_to_close_slot(i);
@@ -736,18 +729,18 @@ static int init_receivers(void)
 		PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 		receivers[i].init(&receivers[i]);
 	}
-	for (i = 0; i < conf.receiver_given; i++) {
+	for (i = conf.receiver_given - 1; i >= 0; i--) {
 		char *arg = conf.receiver_arg[i];
-		char *recv = strchr(arg, ':');
+		char *recv_arg = strchr(arg, ':');
 		ret = -E_MISSING_COLON;
-		if (!recv)
+		if (!recv_arg)
 			goto out;
-		*recv = '\0';
-		recv++;
+		*recv_arg = '\0';
+		recv_arg++;
 		ret = get_audio_format_num(arg);
 		if (ret < 0)
 			goto out;
-		afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
+		afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 		if (!afi[ret].receiver_conf) {
 			ret = -E_RECV_SYNTAX;
 			goto out;
@@ -855,10 +848,11 @@ static int init_stream_io(void)
 	return 1;
 }
 
+/* does not unlink socket on errors */
 static int audiod_get_socket(void)
 {
 	struct sockaddr_un unix_addr;
-	int fd;
+	int ret, fd;
 
 	if (conf.socket_given)
 		socket_name = para_strdup(conf.socket_arg);
@@ -871,52 +865,45 @@ static int audiod_get_socket(void)
 	PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 	if (conf.force_given)
 		unlink(socket_name);
-	fd = create_pf_socket(socket_name, &unix_addr,
-			S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
-	if (fd < 0) {
-		PARA_EMERG_LOG("%s", "can not connect to socket\n");
-		exit(EXIT_FAILURE); /* do not unlink socket */
-	}
+	ret = create_local_socket(socket_name, &unix_addr,
+		S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
+	if (ret < 0)
+		goto err;
+	fd = ret;
 	if (listen(fd , 5) < 0) {
-		PARA_EMERG_LOG("%s", "can not listen on socket\n");
-		exit(EXIT_FAILURE); /* do not unlink socket */
+		ret = -ERRNO_TO_PARA_ERROR(errno);
+		goto err;
 	}
-	add_close_on_fork_list(fd);
+	ret = mark_fd_nonblocking(fd);
+	if (ret < 0)
+		goto err;
 	return fd;
+err:
+	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+	exit(EXIT_FAILURE);
 }
 
-static int open_stat_pipe(void)
-{
-	int ret, fd[3] = {-1, 1, 0};
-	pid_t pid;
-	ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
-	if (ret >= 0) {
-		ret = fd[1];
-		PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
-		add_close_on_fork_list(ret);
-	} else
-		clean_exit(EXIT_FAILURE, "failed to open status pipe");
-	return ret;
-}
-
-void signal_event_handler(struct task *t)
+static void signal_event_handler(struct task *t)
 {
 	struct signal_task *st = t->private_data;
 
-	if (t->ret != -E_SIGNAL_CAUGHT)
-		PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
-	else
-		handle_signal(st->signum);
+	switch (st->signum) {
+	case SIGINT:
+	case SIGTERM:
+	case SIGHUP:
+		PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
+		clean_exit(EXIT_FAILURE, "caught deadly signal");
+	}
 }
 
-void signal_pre_select(struct sched *s, struct task *t)
+static void signal_pre_select(struct sched *s, struct task *t)
 {
 	struct signal_task *st = t->private_data;
 	t->ret = 1;
 	para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 }
 
-void signal_post_select(struct sched *s, struct task *t)
+static void signal_post_select(struct sched *s, struct task *t)
 {
 	struct signal_task *st = t->private_data;
 	t->ret = 1;
@@ -926,7 +913,7 @@ void signal_post_select(struct sched *s, struct task *t)
 	st->signum = para_next_signal();
 }
 
-void signal_setup_default(struct signal_task *st)
+static void signal_setup_default(struct signal_task *st)
 {
 	st->task.pre_select = signal_pre_select;
 	st->task.post_select = signal_post_select;
@@ -948,13 +935,12 @@ static void command_post_select(struct sched *s, struct task *t)
 	struct command_task *ct = t->private_data;
 
 	t->ret = 1; /* always successful */
-	if (audiod_status != AUDIOD_OFF)
-		audiod_status_dump();
+	audiod_status_dump();
 	if (!FD_ISSET(ct->fd, &s->rfds))
 		return;
 	ret = handle_connect(ct->fd);
 	if (ret < 0)
-		PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 }
 
 static void init_command_task(struct command_task *ct)
@@ -967,52 +953,134 @@ static void init_command_task(struct command_task *ct)
 	sprintf(ct->task.status, "command task");
 }
 
-static void status_event_handler(__a_unused struct task *t)
+static void close_stat_pipe(void)
 {
-	struct timeval delay = {1, 0};
 	int i;
-	struct status_task *st = t->private_data;
 
-	PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
+	if (!stat_task->pcd)
+		return;
+	client_close(stat_task->pcd);
+	stat_task->pcd = NULL;
+	FOR_EACH_STATUS_ITEM(i) {
+		free(stat_task->stat_item_values[i]);
+		stat_task->stat_item_values[i] = NULL;
+	}
+	dump_empty_status();
+	stat_task->length_seconds = 0;
+	stat_task->offset_seconds = 0;
+	audiod_status_dump();
+	stat_task->playing = 0;
+	stat_task->stat_item_values[SI_BASENAME] = make_message(
+		"%s: no connection to para_server\n",
+		status_item_list[SI_BASENAME]);
+	stat_client_write(stat_task->stat_item_values[SI_BASENAME],
+		SI_BASENAME);
+	if (stat_task->clock_diff_count) {
+		stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
+		stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
+	}
+}
+
+/**
+ * close the connection to para_server and exit
+ *
+ * \param status the exit status which is passed to exit(3)
+ * \param msg the log message
+ *
+ * Log \a msg with loglevel \p EMERG, close the connection to para_server if
+ * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
+ * EXIT_FAILURE.
+ *
+ * \sa exit(3)
+ */
+void __noreturn clean_exit(int status, const char *msg)
+{
+	PARA_EMERG_LOG("%s\n", msg);
+	if (socket_name)
+		unlink(socket_name);
 	close_stat_pipe();
-	/* avoid busy loop if server is down */
-	tv_add(now, &delay, &st->restart_barrier);
+	exit(status);
+}
+
+/* avoid busy loop if server is down */
+static void set_stat_task_restart_barrier(void)
+{
+	struct timeval delay = {5, 0};
+	tv_add(now, &delay, &stat_task->restart_barrier);
+}
+
+static void client_task_event_handler(__a_unused struct task *t)
+{
+	int i;
+
+	if (t->ret == -E_HANDSHAKE_COMPLETE)
+		return;
+	unregister_task(t);
+	close_stat_pipe();
+	if (t->ret != -E_SERVER_EOF)
+		stat_task->clock_diff_count = conf.clock_diff_count_arg;
+	set_stat_task_restart_barrier();
 	FOR_EACH_AUDIO_FORMAT(i)
-		afi[i].restart_barrier = st->restart_barrier;
+		afi[i].restart_barrier = stat_task->restart_barrier;
 }
 
 static void status_pre_select(struct sched *s, struct task *t)
 {
 	struct status_task *st = t->private_data;
-	t->ret = 1;
-	if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
-		close_stat_pipe();
-	if (st->fd < 0 && audiod_status != AUDIOD_OFF
-		&& tv_diff(now, &st->restart_barrier, NULL) > 0) {
-		st->fd = open_stat_pipe();
-		st->loaded = 0;
-		st->buf[0] = '\0';
+	int ret;
+
+	t->ret = 1; /* always successful */
+	if (st->pcd || audiod_status == AUDIOD_OFF)
+		return;
+	if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
+			< 0)
+		return;
+	if (st->clock_diff_count) {
+		char *argv[] = {"audiod", "stat", "1", NULL};
+		int argc = 3;
+		if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
+			return;
+		PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
+		ret = client_open(argc, argv, &st->pcd);
+
+	} else {
+		char *argv[] = {"audiod", "stat", NULL};
+		int argc = 2;
+		ret = client_open(argc, argv, &st->pcd);
 	}
-	if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
-		para_fd_set(st->fd, &s->rfds, &s->max_fileno);
+	set_stat_task_restart_barrier();
+	if (ret < 0)
+		return;
+	st->pcd->task.event_handler = client_task_event_handler;
+	s->timeout.tv_sec = 0;
+	s->timeout.tv_usec = 1;
 }
 
-static void status_post_select(struct sched *s, struct task *t)
+static void status_post_select(__a_unused struct sched *s, struct task *t)
 {
 	struct status_task *st = t->private_data;
+	unsigned bytes_left;
 
 	t->ret = 1;
-	if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
+	if (!st->pcd || st->pcd->status != CL_RECEIVING)
 		return;
-	t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
-	if (t->ret <= 0) {
-		if (!t->ret)
-			t->ret = -E_STATUS_EOF;
+	if (st->pcd && audiod_status == AUDIOD_OFF) {
+		unregister_task(&st->pcd->task);
+		close_stat_pipe();
+		st->clock_diff_count = conf.clock_diff_count_arg;
 		return;
 	}
-	st->buf[t->ret + st->loaded] = '\0';
-	st->loaded = for_each_line(st->buf, t->ret + st->loaded,
-		&check_stat_line);
+	bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
+		&check_stat_line, NULL);
+	if (st->pcd->loaded != bytes_left) {
+		st->last_status_read = *now;
+		st->pcd->loaded = bytes_left;
+	} else {
+		struct timeval diff;
+		tv_diff(now, &st->last_status_read, &diff);
+		if (diff.tv_sec > 61)
+			close_stat_pipe();
+	}
 }
 
 static void init_status_task(struct status_task *st)
@@ -1020,10 +1088,10 @@ static void init_status_task(struct status_task *st)
 	memset(st, 0, sizeof(struct status_task));
 	st->task.pre_select = status_pre_select;
 	st->task.post_select = status_post_select;
-	st->task.event_handler = status_event_handler;
 	st->task.private_data = st;
-	st->fd = -1;
 	st->sa_time_diff_sign = 1;
+	st->clock_diff_count = conf.clock_diff_count_arg;
+	st->current_audio_format_num = -1;
 	sprintf(st->task.status, "status task");
 }
 
@@ -1041,35 +1109,52 @@ static void set_initial_status(void)
 		return;
 	}
 	if (strcmp(conf.mode_arg, "on"))
-		PARA_WARNING_LOG("%s", "invalid mode\n");
+		PARA_WARNING_LOG("invalid mode\n");
 }
 
+/**
+ * the main function of para_audiod
+ *
+ * \param argc usual argument count
+ * \param argv usual argument vector
+ *
+ * \return EXIT_SUCCESS or EXIT_FAILURE
+ *
+ * \sa para_audiod(1)
+ * */
 int main(int argc, char *argv[])
 {
-	char *cf;
+	char *config_file;
 	int ret, i;
 	struct sched s;
 	struct command_task command_task_struct, *cmd_task = &command_task_struct;
 	struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
 
-	init_sched();
-
 	valid_fd_012();
-	cmdline_parser(argc, argv, &conf);
+	audiod_cmdline_parser(argc, argv, &conf);
+	HANDLE_VERSION_FLAG("audiod", conf);
 	para_drop_privileges(conf.user_arg, conf.group_arg);
-	cf = configfile_exists();
-	if (cf) {
-		if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
-			PARA_EMERG_LOG("%s", "parse error in config file\n");
+	config_file = configfile_exists();
+	if (config_file) {
+		struct audiod_cmdline_parser_params params = {
+			.override = 0,
+			.initialize = 0,
+			.check_required = 0,
+			.check_ambiguity = 0
+
+		};
+		if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
+			PARA_EMERG_LOG("parse error in config file\n");
 			exit(EXIT_FAILURE);
 		}
+		free(config_file);
 	}
 	if (conf.logfile_given)
 		logfile = open_log(conf.logfile_arg);
 	log_welcome("para_audiod", conf.loglevel_arg);
 	i = init_stream_io();
 	if (i < 0) {
-		PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
+		PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
 		exit(EXIT_FAILURE);
 	}
 	server_uptime(UPTIME_SET);
@@ -1092,10 +1177,10 @@ int main(int argc, char *argv[])
 	register_task(&cmd_task->task);
 	register_task(&stat_task->task);
 	register_task(audiod_task);
-	s.default_timeout.tv_sec = 3;
+	s.default_timeout.tv_sec = 0;
 	s.default_timeout.tv_usec = 99 * 1000;
-	ret = sched(&s);
+	ret = schedule(&s);
 
-	PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
+	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 	return EXIT_FAILURE;
 }