X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod.c;h=d9df3847b61c1ff93f7fcf8389ccb90baadff17e;hp=d2c66f2bfe5f5bd0d8ba1da88b048ad21d9ceb00;hb=97ad8ac8735dfd7a514aa66e9de54f253440c17d;hpb=e065f3eec9be99d82da855bf3da38d8e86752fef

diff --git a/audiod.c b/audiod.c
index d2c66f2b..d9df3847 100644
--- a/audiod.c
+++ b/audiod.c
@@ -1,12 +1,18 @@
 /*
- * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2014 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file audiod.c The paraslash's audio daemon. */
+
+#include <netinet/in.h>
+#include <sys/socket.h>
 #include <regex.h>
 #include <sys/types.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <netdb.h>
 #include <signal.h>
 
 #include "para.h"
@@ -87,14 +93,10 @@ enum vss_status_flags {
  */
 struct sched sched = {.max_fileno = 0};
 
-/**
- * The task for obtaining para_server's status (para_client stat).
- *
- * \sa struct task, struct sched.
- */
+/* The task for obtaining para_server's status (para_client stat). */
 struct status_task {
 	/** The associated task structure of audiod. */
-	struct task task;
+	struct task *task;
 	/** Client data associated with the stat task. */
 	struct client_task *ct;
 	/** Do not restart client command until this time. */
@@ -162,7 +164,7 @@ struct command_task {
 	/** the local listening socket */
 	int fd;
 	/** the associated task structure */
-	struct task task;
+	struct task *task;
 };
 
 /** iterate over all supported audio formats */
@@ -213,7 +215,7 @@ static int get_matching_audio_format_nums(const char *re)
  * from the status items received from para_server and the start time of the
  * (first) writer of the given slot.
  *
- * It has to to take into account that probably the stream was not started at
+ * It has to take into account that the stream was probably not started at
  * the beginning of the file, that the clock between the server and the client
  * host may differ and that playback of the stream was delayed, e.g. because
  * the prebuffer filter is used in the filter configuration of the given slot.
@@ -343,10 +345,11 @@ static void parse_config_or_die(void)
 		PARA_EMERG_LOG("can not read config file %s\n", config_file);
 		goto err;
 	}
-	if (ret)
+	if (ret) {
 		audiod_cmdline_parser_config_file(config_file, &conf, &params);
+		daemon_set_loglevel(conf.loglevel_arg);
+	}
 	free(config_file);
-	daemon_set_loglevel(conf.loglevel_arg);
 	return;
 err:
 	free(config_file);
@@ -384,6 +387,7 @@ static void close_receiver(int slot_num)
 		audio_formats[s->format], slot_num);
 	a->receiver->close(s->receiver_node);
 	btr_remove_node(&s->receiver_node->btrn);
+	task_reap(&s->receiver_node->task);
 	free(s->receiver_node);
 	s->receiver_node = NULL;
 	tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
@@ -400,6 +404,7 @@ static void writer_cleanup(struct writer_node *wn)
 	PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 	w->close(wn);
 	btr_remove_node(&wn->btrn);
+	task_reap(&wn->task);
 }
 
 static void close_writers(struct slot_info *s)
@@ -427,7 +432,7 @@ static void close_filters(struct slot_info *s)
 	struct audio_format_info *a = afi + s->format;
 	if (a->num_filters == 0)
 		return;
-	for (i = 0; i < a->num_filters; i++) {
+	for (i = a->num_filters - 1; i >= 0; i--) {
 		struct filter_node *fn = s->fns + i;
 		struct filter *f;
 
@@ -437,6 +442,7 @@ static void close_filters(struct slot_info *s)
 		if (f->close)
 			f->close(fn);
 		btr_remove_node(&fn->btrn);
+		task_reap(&fn->task);
 	}
 	free(s->fns);
 	s->fns = NULL;
@@ -452,7 +458,7 @@ static void notify_receivers(int error)
 			continue;
 		if (!s->receiver_node)
 			continue;
-		task_notify(&s->receiver_node->task, error);
+		task_notify(s->receiver_node->task, error);
 	}
 }
 
@@ -490,22 +496,26 @@ static void open_filters(struct slot_info *s)
 	s->fns = para_calloc(nf * sizeof(struct filter_node));
 	parent = s->receiver_node->btrn;
 	for (i = 0; i < nf; i++) {
+		char buf[20];
 		struct filter *f = filters + a->filter_nums[i];
 		fn = s->fns + i;
 		fn->filter_num = a->filter_nums[i];
 		fn->conf = a->filter_conf[i];
-		fn->task.pre_select = f->pre_select;
-		fn->task.post_select = f->post_select;
 		fn->btrn = btr_new_node(&(struct btr_node_description)
 			EMBRACE(.name = f->name, .parent = parent,
 				.handler = f->execute, .context = fn));
 
 		f->open(fn);
-		register_task(&sched, &fn->task);
+		sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
+		fn->task = task_register(&(struct task_info) {
+			.name = buf,
+			.pre_select = f->pre_select,
+			.post_select = f->post_select,
+			.context = fn,
+		}, &sched);
 		parent = fn->btrn;
 		PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 			audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
-		sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 	}
 }
 
@@ -519,12 +529,13 @@ static void open_writers(struct slot_info *s)
 	assert(s->wns == NULL);
 	s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 		* sizeof(struct writer_node));
-	PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 	for (i = 0; i < a->num_writers; i++) {
 		wn = s->wns + i;
 		wn->conf = a->writer_conf[i];
 		wn->writer_num = a->writer_nums[i];
 		register_writer_node(wn, parent, &sched);
+		PARA_NOTICE_LOG("%s writer started in slot %d\n",
+			writer_names[a->writer_nums[i]], (int)(s - slot));
 	}
 }
 
@@ -558,10 +569,12 @@ static int open_receiver(int format)
 	s->receiver_node = rn;
 	PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 		audio_formats[format], r->name, slot_num);
-	rn->task.pre_select = r->pre_select;
-	rn->task.post_select = r->post_select;
-	sprintf(rn->task.status, "%s receiver node", r->name);
-	register_task(&sched, &rn->task);
+	rn->task = task_register(&(struct task_info) {
+		.name = r->name,
+		.pre_select = r->pre_select,
+		.post_select = r->post_select,
+		.context = rn,
+	}, &sched);
 	return slot_num;
 }
 
@@ -576,7 +589,7 @@ static bool receiver_running(void)
 
 		if (!s->receiver_node)
 			continue;
-		if (s->receiver_node->task.error >= 0)
+		if (task_status(s->receiver_node->task) >= 0)
 			return true;
 		if (ss1 == ss2)
 			return true;
@@ -603,7 +616,7 @@ struct btr_node *audiod_get_btr_root(void)
 		struct timeval rstime;
 		if (!s->receiver_node)
 			continue;
-		if (s->receiver_node->task.error < 0)
+		if (task_status(s->receiver_node->task) < 0)
 			continue;
 		btr_get_node_start(s->receiver_node->btrn, &rstime);
 		if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
@@ -639,7 +652,7 @@ static bool must_start_decoder(void)
 	return true;
 }
 
-static unsigned compute_time_diff(const struct timeval *status_time)
+static void compute_time_diff(const struct timeval *status_time)
 {
 	struct timeval tmp, diff;
 	static unsigned count;
@@ -647,8 +660,6 @@ static unsigned compute_time_diff(const struct timeval *status_time)
 	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);
@@ -678,7 +689,6 @@ static unsigned compute_time_diff(const struct timeval *status_time)
 	);
 out:
 	stat_task->sa_time_diff_sign = sa_time_diff_sign;
-	return count;
 }
 
 static int update_item(int itemnum, char *buf)
@@ -913,7 +923,7 @@ out:
 
 static int parse_filter_args(void)
 {
-	int i, j, ret, af_mask;
+	int i, j, ret, af_mask, num_matches;
 
 	for (i = 0; i < conf.filter_given; i++) {
 		char *arg;
@@ -921,13 +931,18 @@ static int parse_filter_args(void)
 		if (ret < 0)
 			goto out;
 		af_mask = ret;
+		num_matches = 0;
 		FOR_EACH_AUDIO_FORMAT(j) {
 			if ((af_mask & (1 << j)) == 0) /* no match */
 				continue;
 			ret = add_filter(j, arg);
 			if (ret < 0)
 				goto out;
+			num_matches++;
 		}
+		if (num_matches == 0)
+			PARA_WARNING_LOG("ignoring filter spec: %s\n",
+				conf.filter_arg[i]);
 	}
 	ret = init_default_filters(); /* use default values for the rest */
 out:
@@ -985,73 +1000,98 @@ err:
 	exit(EXIT_FAILURE);
 }
 
-static void signal_pre_select(struct sched *s, struct task *t)
+static void signal_pre_select(struct sched *s, void *context)
 {
-	struct signal_task *st = container_of(t, struct signal_task, task);
+	struct signal_task *st = context;
 	para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 }
 
-static int signal_post_select(struct sched *s, __a_unused struct task *t)
+static int signal_post_select(struct sched *s, void *context)
 {
-	int signum;
+	struct signal_task *st = context;
+	int ret, signum;
 
+	ret = task_get_notification(st->task);
+	if (ret < 0)
+		return ret;
 	signum = para_next_signal(&s->rfds);
 	switch (signum) {
 	case SIGINT:
 	case SIGTERM:
 	case SIGHUP:
-		PARA_EMERG_LOG("terminating on signal %d\n", signum);
-		clean_exit(EXIT_FAILURE, "caught deadly signal");
+		PARA_NOTICE_LOG("received signal %d\n", signum);
+		task_notify_all(s, E_AUDIOD_SIGNAL);
+		return -E_AUDIOD_SIGNAL;
 	}
 	return 0;
 }
 
-static void signal_setup_default(struct signal_task *st)
-{
-	st->task.pre_select = signal_pre_select;
-	st->task.post_select = signal_post_select;
-	sprintf(st->task.status, "signal task");
-}
-
-static void command_pre_select(struct sched *s, struct task *t)
+static void command_pre_select(struct sched *s, void *context)
 {
-	struct command_task *ct = container_of(t, struct command_task, task);
+	struct command_task *ct = context;
 	para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 }
 
-static int command_post_select(struct sched *s, struct task *t)
+static int command_post_select(struct sched *s, void *context)
 {
 	int ret;
-	struct command_task *ct = container_of(t, struct command_task, task);
+	struct command_task *ct = context;
 	static struct timeval last_status_dump;
-	struct timeval tmp, delay = {0, 500 * 1000};
+	struct timeval tmp, delay;
+	bool force = true;
 
-	tv_add(&last_status_dump, &delay, &tmp);
-	if (tv_diff(&tmp, now, NULL) < 0) {
-		audiod_status_dump();
-		last_status_dump = *now;
-	}
-
-	ret = handle_connect(ct->fd, &s->rfds);
+	ret = task_get_notification(ct->task);
 	if (ret < 0)
+		return ret;
+	ret = handle_connect(ct->fd, &s->rfds);
+	if (ret < 0) {
 		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-	audiod_status_dump();
-	return 0;
+		if (ret == -E_AUDIOD_TERM) {
+			task_notify_all(s, -ret);
+			return ret;
+		}
+	} else if (ret > 0)
+		goto dump;
+
+	/* if last status dump was less than 500ms ago, do nothing */
+	delay.tv_sec = 0;
+	delay.tv_usec = 500 * 1000;
+	tv_add(&last_status_dump, &delay, &tmp);
+	if (tv_diff(now, &tmp, NULL) < 0)
+		return 0;
+
+	/*
+	 * If last status dump was more than 5s ago, force update. Otherwise,
+	 * update only those items that have changed.
+	 */
+	delay.tv_sec = 5;
+	delay.tv_usec = 0;
+	tv_add(&last_status_dump, &delay, &tmp);
+	if (tv_diff(now, &tmp, NULL) < 0)
+		force = false;
+dump:
+	audiod_status_dump(force);
+	last_status_dump = *now;
+	return 1;
 }
 
 static void init_command_task(struct command_task *ct)
 {
-	ct->task.pre_select = command_pre_select;
-	ct->task.post_select = command_post_select;
-	ct->task.error = 0;
 	ct->fd = audiod_get_socket(); /* doesn't return on errors */
-	sprintf(ct->task.status, "command task");
+
+	ct->task = task_register(&(struct task_info) {
+		.name = "command",
+		.pre_select = command_pre_select,
+		.post_select = command_post_select,
+		.context = ct,
+	}, &sched);
 }
 
 static void close_stat_pipe(void)
 {
 	if (!stat_task->ct)
 		return;
+	task_reap(&stat_task->ct->task);
 	client_close(stat_task->ct);
 	stat_task->ct = NULL;
 	clear_and_dump_items();
@@ -1059,28 +1099,7 @@ static void close_stat_pipe(void)
 	stat_task->offset_seconds = 0;
 	stat_task->vss_status = 0;
 	stat_task->current_audio_format_num = -1;
-	audiod_status_dump();
-}
-
-/**
- * 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();
-	exit(status);
+	audiod_status_dump(true);
 }
 
 /* avoid busy loop if server is down */
@@ -1098,36 +1117,56 @@ static bool must_close_slot(int slot_num)
 
 	if (s->format < 0)
 		return false;
-	if (s->receiver_node && s->receiver_node->task.error >= 0)
+	if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
 		return false;
 	for (i = 0; i < a->num_filters; i++)
-		if (s->fns && s->fns[i].task.error >= 0)
+		if (s->fns && task_status(s->fns[i].task) >= 0)
 			return false;
 	if (a->num_writers > 0) {
 		for (i = 0; i < a->num_writers; i++)
-			if (s->wns && s->wns[i].task.error >= 0)
+			if (s->wns && task_status(s->wns[i].task) >= 0)
 				return false;
 	} else {
-		if (s->wns && s->wns[0].task.error >= 0)
+		if (s->wns && task_status(s->wns[0].task) >= 0)
 			return false;
 	}
 	return true;
 }
 
+static void close_slot(int slot_num)
+{
+	struct slot_info *s = slot + slot_num;
+
+	PARA_INFO_LOG("closing slot %d\n", slot_num);
+	close_writers(s);
+	close_filters(s);
+	close_receiver(slot_num);
+	clear_slot(slot_num);
+}
+
 static void close_unused_slots(void)
 {
 	int i;
 
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = slot + i;
-		if (!must_close_slot(i))
-			continue;
-		PARA_INFO_LOG("closing slot %d\n", i);
-		close_writers(s);
-		close_filters(s);
-		close_receiver(i);
-		clear_slot(i);
-	}
+	FOR_EACH_SLOT(i)
+		if (must_close_slot(i))
+			close_slot(i);
+}
+
+/*
+ * Cleanup all resources.
+ *
+ * This performs various cleanups, removes the audiod socket and closes the
+ * connection to para_server.
+ */
+static void audiod_cleanup(void)
+{
+	if (socket_name)
+		unlink(socket_name);
+	close_stat_pipe();
+	close_unused_slots();
+	audiod_cmdline_parser_free(&conf);
+	close_stat_clients();
 }
 
 /*
@@ -1138,7 +1177,6 @@ static void start_stop_decoders(void)
 {
 	int ret;
 	struct slot_info *sl;
-	struct audio_format_info *a;
 
 	close_unused_slots();
 	if (audiod_status != AUDIOD_ON ||
@@ -1152,17 +1190,15 @@ static void start_stop_decoders(void)
 		return;
 	}
 	sl = slot + ret;
-	a = afi + sl->format;
-	if (a->num_filters)
-		open_filters(sl);
+	open_filters(sl);
 	open_writers(sl);
 	activate_grab_clients(&sched);
 	btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
 }
 
-static void status_pre_select(struct sched *s, struct task *t)
+static void status_pre_select(struct sched *s, void *context)
 {
-	struct status_task *st = container_of(t, struct status_task, task);
+	struct status_task *st = context;
 	int i, ret, cafn = stat_task->current_audio_format_num;
 
 	if (must_start_decoder())
@@ -1192,15 +1228,19 @@ min_delay:
 }
 
 /* restart the client task if necessary */
-static int status_post_select(struct sched *s, struct task *t)
+static int status_post_select(struct sched *s, void *context)
 {
-	struct status_task *st = container_of(t, struct status_task, task);
+	struct status_task *st = context;
+	int ret;
 
+	ret = task_get_notification(st->task);
+	if (ret < 0)
+		return ret;
 	if (audiod_status == AUDIOD_OFF) {
 		if (!st->ct)
 			goto out;
-		if (st->ct->task.error >= 0) {
-			task_notify(&st->ct->task, E_AUDIOD_OFF);
+		if (task_status(st->ct->task) >= 0) {
+			task_notify(st->ct->task, E_AUDIOD_OFF);
 			goto out;
 		}
 		close_stat_pipe();
@@ -1210,26 +1250,26 @@ static int status_post_select(struct sched *s, struct task *t)
 	if (st->ct) {
 		char *buf;
 		size_t sz;
-		int ret;
-		if (st->ct->task.error < 0) {
+
+		ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
+		if (ret < 0) {
 			close_stat_pipe();
 			goto out;
 		}
-		if (st->ct->status != CL_RECEIVING)
+		if (st->ct->status != CL_EXECUTING)
 			goto out;
-		ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
-		if (ret <= 0) {
+		if (ret == 0) {
 			struct timeval diff;
 			tv_diff(now, &st->last_status_read, &diff);
 			if (diff.tv_sec > 61)
-				task_notify(&st->ct->task, E_AUDIOD_OFF);
+				task_notify(st->ct->task, E_STATUS_TIMEOUT);
 			goto out;
 		}
 		btr_merge(st->btrn, st->min_iqs);
 		sz = btr_next_buffer(st->btrn, &buf);
 		ret = for_each_stat_item(buf, sz, update_item);
 		if (ret < 0) {
-			task_notify(&st->ct->task, E_AUDIOD_OFF);
+			task_notify(st->ct->task, -ret);
 			goto out;
 		}
 		if (sz != ret) {
@@ -1271,14 +1311,18 @@ out:
 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->sa_time_diff_sign = 1;
 	st->clock_diff_count = conf.clock_diff_count_arg;
 	st->current_audio_format_num = -1;
-	sprintf(st->task.status, "stat");
 	st->btrn = btr_new_node(&(struct btr_node_description)
 		EMBRACE(.name = "stat"));
+
+	stat_task->task = task_register(&(struct task_info) {
+		.name = "stat",
+		.pre_select = status_pre_select,
+		.post_select = status_post_select,
+		.context = stat_task,
+	}, &sched);
 }
 
 static void set_initial_status(void)
@@ -1300,18 +1344,17 @@ static void set_initial_status(void)
 
 __noreturn static void print_help_and_die(void)
 {
-	int d = conf.detailed_help_given;
-	const char **p = d? audiod_args_info_detailed_help
-		: audiod_args_info_help;
-
-	printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
-		AUDIOD_CMDLINE_PARSER_VERSION);
-	printf_or_die("%s\n\n", audiod_args_info_usage);
-	for (; *p; p++)
-		printf_or_die("%s\n", *p);
-	print_receiver_helps(d);
-	print_filter_helps(d);
-	print_writer_helps(d);
+	struct ggo_help h = DEFINE_GGO_HELP(audiod);
+	bool d = conf.detailed_help_given;
+	unsigned flags;
+
+	flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
+	ggo_print_help(&h, flags);
+
+	flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
+	print_receiver_helps(flags);
+	print_filter_helps(flags);
+	print_writer_helps(flags);
 	exit(0);
 }
 
@@ -1350,16 +1393,16 @@ int main(int argc, char *argv[])
 	};
 
 	valid_fd_012();
-	if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
-		exit(EXIT_FAILURE);
-	HANDLE_VERSION_FLAG("audiod", conf);
+	audiod_cmdline_parser_ext(argc, argv, &conf, &params);
+	daemon_set_loglevel(conf.loglevel_arg);
+	version_handle_flag("audiod", conf.version_given);
 	/* init receivers/filters/writers early to make help work */
 	recv_init();
 	filter_init();
 	writer_init();
 	if (conf.help_given || conf.detailed_help_given)
 		print_help_and_die();
-	drop_privileges_or_die(conf.user_arg, conf.group_arg);
+	daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
 	parse_config_or_die();
 	init_colors_or_die();
 	init_random_seed_or_die();
@@ -1377,13 +1420,12 @@ int main(int argc, char *argv[])
 		PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 		exit(EXIT_FAILURE);
 	}
-	log_welcome("para_audiod");
-	set_server_start_time(NULL);
+	daemon_log_welcome("para_audiod");
+	daemon_set_start_time();
 	set_initial_status();
 	FOR_EACH_SLOT(i)
 		clear_slot(i);
 	setup_signal_handling();
-	signal_setup_default(sig_task);
 
 	init_status_task(stat_task);
 	init_command_task(cmd_task);
@@ -1391,13 +1433,20 @@ int main(int argc, char *argv[])
 	if (conf.daemon_given)
 		daemonize(false /* parent exits immediately */);
 
-	register_task(&sched, &sig_task->task);
-	register_task(&sched, &cmd_task->task);
-	register_task(&sched, &stat_task->task);
+	sig_task->task = task_register(&(struct task_info) {
+		.name = "signal",
+		.pre_select = signal_pre_select,
+		.post_select = signal_post_select,
+		.context = sig_task,
+	}, &sched);
+
 	sched.default_timeout.tv_sec = 2;
 	sched.default_timeout.tv_usec = 999 * 1000;
 	ret = schedule(&sched);
+	audiod_cleanup();
+	sched_shutdown(&sched);
 
-	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
-	return EXIT_FAILURE;
+	if (ret < 0)
+		PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+	return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 }