diff --git a/clsync.h b/clsync.h
index 95de249..d21a990 100644
--- a/clsync.h
+++ b/clsync.h
@@ -17,6 +17,9 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef __CLSYNC_CLSYNC_H
+#define __CLSYNC_CLSYNC_H
+
 #include <stdio.h>
 #include <stdint.h>
 #include <sys/types.h>
@@ -89,3 +92,5 @@ extern int clsyncapi_getapiversion();
  */
 extern pid_t clsyncapi_fork(struct ctx *ctx_p);
 
+#endif
+
diff --git a/common.h b/common.h
index 86e3ae0..aea3dbd 100644
--- a/common.h
+++ b/common.h
@@ -182,6 +182,7 @@ typedef struct eventinfo eventinfo_t;
 typedef int (*thread_callbackfunct_t)(ctx_t *ctx_p, char **argv);
 struct threadinfo {
 	int			  thread_num;
+	uint32_t		  iteration;
 	thread_callbackfunct_t 	  callback;
 	char 			**argv;
 	pthread_t		  pthread;
diff --git a/configuration.h b/configuration.h
index 58abcec..4421916 100644
--- a/configuration.h
+++ b/configuration.h
@@ -71,3 +71,5 @@
 #define CONFIG_PATHS 			{ ".clsync.conf", "/etc/clsync/clsync.conf", NULL } /* "~/.clsync.conf" and "/etc/clsync/clsync.conf" */
 
 #define API_PREFIX			"clsyncapi_"
+
+#define DUMP_DIRMODE			0700
diff --git a/control.c b/control.c
index 0f97512..e0a6985 100644
--- a/control.c
+++ b/control.c
@@ -20,7 +20,14 @@
 #include "common.h"
 
 #include <sys/un.h>	// for "struct sockaddr_un"
+#include <sys/stat.h>	// mkdir()
+#include <sys/types.h>	// mkdir()
+#include <fcntl.h>	// mkdirat()
+#include <glib.h>	// g_hash_table_foreach()
 
+
+#include "indexes.h"
+#include "ctx.h"
 #include "error.h"
 #include "sync.h"
 #include "control.h"
@@ -28,19 +35,195 @@
 
 static pthread_t pthread_control;
 
+
+static inline int control_error(clsyncsock_t *clsyncsock_p, const char *const funct, const char *const args) {
+	return socket_send(clsyncsock_p, SOCKCMD_REPLY_ECUSTOM, funct, args, errno, strerror(errno));
+}
+
+enum dump_dirfd_obj {
+	DUMP_DIRFD_ROOT = 0,
+	DUMP_DIRFD_QUEUE,
+	DUMP_DIRFD_THREAD,
+
+	DUMP_DIRFD_MAX
+};
+
+enum dump_ltype {
+	DUMP_LTYPE_INCLUDE,
+	DUMP_LTYPE_EXCLUDE,
+	DUMP_LTYPE_EVINFO,
+};
+
+struct control_dump_arg {
+	clsyncsock_t 	*clsyncsock_p;
+	ctx_t 		*ctx_p;
+	int 		 dirfd[DUMP_DIRFD_MAX];
+	int		 fd_out;
+	int		 data;
+};
+
+void control_dump_liststep(gpointer fpath_gp, gpointer evinfo_gp, gpointer arg_gp) {
+	char *fpath			=         (char *)fpath_gp;
+	eventinfo_t *evinfo		=  (eventinfo_t *)evinfo_gp;
+	struct control_dump_arg *arg 	= 		  arg_gp;
+	char act, num;
+
+	switch (arg->data) {
+		case DUMP_LTYPE_INCLUDE:
+			act = '+';
+			num = '1';
+			break;
+		case DUMP_LTYPE_EXCLUDE:
+			act = '-';
+			num = '1';
+			break;
+		case DUMP_LTYPE_EVINFO:
+			act = '+';
+			num = 	 evinfo->flags&EVIF_RECURSIVELY        ? '*' : 
+				(evinfo->flags&EVIF_CONTENTRECURSIVELY ? '/' : '1');
+			break;
+		default:
+			act = '?';
+			num = '?';
+	}
+
+	dprintf(arg->fd_out, "%c%c %s\n", act, num, fpath);
+
+	return;
+}
+
+int control_dump_thread(threadinfo_t *threadinfo_p, void *_arg) {
+	struct control_dump_arg *arg = _arg;
+	char buf[BUFSIZ];
+
+	snprintf(buf, BUFSIZ, "%u-%u-%lx", threadinfo_p->iteration, threadinfo_p->thread_num, (long)threadinfo_p->pthread);
+
+	arg->fd_out = openat(arg->dirfd[DUMP_DIRFD_THREAD], buf, O_WRONLY);
+	if (arg->fd_out == -1)
+		return errno;
+
+	{
+		char **argv;
+
+		dprintf(arg->fd_out, 
+			"thread:\n\titeration == %u;\n\tnum == %u;\n\tpthread == %lx;\n\tstarttime == %lu\n\texpiretime == %lu\n\tchild_pid == %u\n\ttry_n == %u\nCommand:",
+				threadinfo_p->iteration,
+				threadinfo_p->thread_num,
+				(long)threadinfo_p->pthread,
+				threadinfo_p->starttime,
+				threadinfo_p->expiretime,
+				threadinfo_p->child_pid,
+				threadinfo_p->try_n
+			);
+
+		argv = threadinfo_p->argv;
+		while (argv != NULL)
+			dprintf(arg->fd_out, " \"%s\"", *(argv++));
+
+		dprintf(arg->fd_out, "\n");
+	}
+
+	arg->data = DUMP_LTYPE_EVINFO;
+	g_hash_table_foreach(threadinfo_p->fpath2ei_ht, control_dump_liststep, arg);
+
+	close(arg->fd_out);
+
+	return 0;
+}
+
+int control_mkdir_open(clsyncsock_t *clsyncsock_p, const char *const dir_path) {
+	int dirfd;
+
+	if (mkdir(dir_path, DUMP_DIRMODE)) {
+		control_error(clsyncsock_p, "mkdir", dir_path);
+		return -1;
+	}
+
+	dirfd = open(dir_path, O_RDWR);
+	if (dirfd == -1) {
+		control_error(clsyncsock_p, "open",  dir_path);
+		return -1;
+	}
+
+	return dirfd;
+}
+
+int control_dump(ctx_t *ctx_p, clsyncsock_t *clsyncsock_p, sockcmd_t *sockcmd_p) {
+	indexes_t	*indexes_p	= ctx_p->indexes_p;
+	sockcmd_dat_dump_t *dat		= sockcmd_p->data;
+	int rootfd;
+	struct control_dump_arg arg;
+	enum dump_dirfd_obj dirfd_obj;
+
+	static const char *const subdirs[] = {
+		[DUMP_DIRFD_QUEUE]	= "queue",
+		[DUMP_DIRFD_THREAD]	= "threads"
+	};
+
+	rootfd = control_mkdir_open(clsyncsock_p, dat->dir_path);
+	if (rootfd == -1)
+		goto l_control_dump_end;
+
+	arg.dirfd[DUMP_DIRFD_ROOT] = rootfd;
+
+	dirfd_obj = DUMP_DIRFD_ROOT+1;
+	while (dirfd_obj < DUMP_DIRFD_MAX) {
+		const char *const subdir = subdirs[dirfd_obj];
+
+		arg.dirfd[dirfd_obj] = control_mkdir_open(clsyncsock_p, subdir);
+		if (arg.dirfd[dirfd_obj] == -1)
+			goto l_control_dump_end;
+
+		dirfd_obj++;
+	}
+
+	arg.clsyncsock_p = clsyncsock_p;
+	arg.ctx_p	 = ctx_p;
+
+	int queue_id = 0;
+	while (queue_id < QUEUE_MAX) {
+		char buf[BUFSIZ];
+		snprintf(buf, BUFSIZ, "%u", queue_id);
+
+		arg.fd_out = openat(arg.dirfd[DUMP_DIRFD_QUEUE], buf, O_WRONLY);
+
+		arg.data = DUMP_LTYPE_EVINFO;
+		g_hash_table_foreach(indexes_p->fpath2ei_coll_ht[queue_id],  control_dump_liststep, &arg);
+		arg.data = DUMP_LTYPE_EXCLUDE;
+		g_hash_table_foreach(indexes_p->exc_fpath_coll_ht[queue_id], control_dump_liststep, &arg);
+
+		close(arg.fd_out);
+		queue_id++;
+	}
+
+	threads_foreach(control_dump_thread, STATE_RUNNING, &arg);
+
+l_control_dump_end:
+	dirfd_obj = DUMP_DIRFD_ROOT;
+	while (dirfd_obj < DUMP_DIRFD_MAX) {
+		if (arg.dirfd[dirfd_obj] != -1)
+			close(arg.dirfd[dirfd_obj]);
+		dirfd_obj++;
+	}
+
+	return errno ? errno : socket_send(clsyncsock_p, SOCKCMD_REPLY_DUMP);
+}
+
+
 int control_procclsyncsock(socket_sockthreaddata_t *arg, sockcmd_t *sockcmd_p) {
-	clsyncsock_t	*clsyncsock_p =              arg->clsyncsock_p;
-	ctx_t 	*ctx_p    = (ctx_t *)arg->arg;
+	clsyncsock_t	*clsyncsock_p =          arg->clsyncsock_p;
+	ctx_t		*ctx_p        = (ctx_t *)arg->arg;
 
 	switch(sockcmd_p->cmd_id) {
-		case SOCKCMD_REQUEST_INFO: {
+		case SOCKCMD_REQUEST_DUMP:
+			control_dump(ctx_p, clsyncsock_p, sockcmd_p);
+			break;
+		case SOCKCMD_REQUEST_INFO:
 			socket_send(clsyncsock_p, SOCKCMD_REPLY_INFO, ctx_p->config_block, ctx_p->label, ctx_p->flags, ctx_p->flags_set);
 			break;
-		}
-		case SOCKCMD_REQUEST_DIE: {
+		case SOCKCMD_REQUEST_DIE:
 			sync_term(SIGTERM);
 			break;
-		}
 		default:
 			return EINVAL;
 	}
diff --git a/ctx.h b/ctx.h
index ec42191..339eed6 100644
--- a/ctx.h
+++ b/ctx.h
@@ -232,6 +232,7 @@ struct ctx {
 	sigset_t *sigset;
 	char isignoredexitcode[(1<<8)];
 #endif
+	void *indexes_p;
 };
 typedef struct ctx ctx_t;
 
diff --git a/indexes.h b/indexes.h
index 6110b0a..046bfc2 100644
--- a/indexes.h
+++ b/indexes.h
@@ -17,6 +17,9 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef __CLSYNC_INDEXES_H
+#define __CLSYNC_INDEXES_H
+
 #include <glib.h>
 
 struct indexes {
@@ -30,3 +33,5 @@ struct indexes {
 };
 typedef struct indexes indexes_t;
 
+#endif
+
diff --git a/socket.c b/socket.c
index d4c3085..0c7903f 100644
--- a/socket.c
+++ b/socket.c
@@ -58,6 +58,7 @@ static char *recv_ptrs[SOCKET_MAX];
 
 const char *const textmessage_args[SOCKCMD_MAXID] = {
 	[SOCKCMD_REQUEST_NEGOTIATION] 	= "%u",
+	[SOCKCMD_REQUEST_DUMP]	 	= "%s",
 	[SOCKCMD_REPLY_NEGOTIATION] 	= "%u",
 	[SOCKCMD_REPLY_ACK]		= "%03u %lu",
 	[SOCKCMD_REPLY_EINVAL]		= "%03u %lu",
@@ -65,6 +66,9 @@ const char *const textmessage_args[SOCKCMD_MAXID] = {
 	[SOCKCMD_REPLY_INFO]		= "%s\003/ %s\003/ %x %x",
 	[SOCKCMD_REPLY_UNKNOWNCMD]	= "%03u %lu",
 	[SOCKCMD_REPLY_INVALIDCMDID]	= "%lu",
+	[SOCKCMD_REPLY_EEXIST]		= "%s\003/",
+	[SOCKCMD_REPLY_EPERM]		= "%s\003/",
+	[SOCKCMD_REPLY_ECUSTOM]		= "%s\003/ %s\003/ %u %s\003/",
 };
 
 const char *const textmessage_descr[SOCKCMD_MAXID] = {
@@ -78,8 +82,12 @@ const char *const textmessage_descr[SOCKCMD_MAXID] = {
 	[SOCKCMD_REPLY_BYE]		= "Bye.",
 	[SOCKCMD_REPLY_VERSION]		= "clsync v%u.%u%s",
 	[SOCKCMD_REPLY_INFO]		= "config_block == \"%s\"; label == \"%s\"; flags == %x; flags_set == %x.",
+	[SOCKCMD_REPLY_DUMP]		= "Ready",
 	[SOCKCMD_REPLY_UNKNOWNCMD]	= "Unknown command.",
 	[SOCKCMD_REPLY_INVALIDCMDID]	= "Invalid command id. Required: 0 <= cmd_id < 1000.",
+	[SOCKCMD_REPLY_EEXIST]		= "File exists: \"%s\".",
+	[SOCKCMD_REPLY_EPERM]		= "Permission denied: \"%s\".",
+	[SOCKCMD_REPLY_ECUSTOM]		= "%s(%s): Error #%u: \"%s\".",
 };
 
 int socket_check_bysock(int sock) {
@@ -346,6 +354,9 @@ static inline int parse_text_data(sockcmd_t *sockcmd_p, char *args, size_t args_
 		case SOCKCMD_REPLY_NEGOTIATION:
 			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_negotiation_t, &d->prot, &d->subprot);
 			break;
+		case SOCKCMD_REQUEST_DUMP:
+			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_dump_t, &d->dir_path);
+			break;
 		case SOCKCMD_REPLY_ACK:
 			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_ack_t, &d->cmd_id, &d->cmd_num);
 			break;
@@ -368,10 +379,16 @@ static inline int parse_text_data(sockcmd_t *sockcmd_p, char *args, size_t args_
 		case SOCKCMD_REPLY_INVALIDCMDID:
 			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_invalidcmd_t, &d->cmd_num);
 			break;
+		case SOCKCMD_REPLY_EEXIST:
+			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_eexist_t, &d->file_path);
+			break;
+		case SOCKCMD_REPLY_EPERM:
+			PARSE_TEXT_DATA_SSCANF(sockcmd_dat_eperm_t,  &d->descr);
+			break;
 		default:
 			sockcmd_p->data = xmalloc(args_len+1);
 			memcpy(sockcmd_p->data, args, args_len);
-			sockcmd_p->data[args_len] = 0;
+			((char *)sockcmd_p->data)[args_len] = 0;
 			break;
 	}
 
diff --git a/socket.h b/socket.h
index e9205e4..75fc3f7 100644
--- a/socket.h
+++ b/socket.h
@@ -78,18 +78,22 @@ enum sockcmd_id {
 	SOCKCMD_REPLY_UNKNOWNCMD	= 160,
 	SOCKCMD_REPLY_INVALIDCMDID	= 161,
 	SOCKCMD_REPLY_EINVAL		= 162,
+	SOCKCMD_REPLY_EEXIST		= 163,
+	SOCKCMD_REPLY_EPERM		= 164,
+	SOCKCMD_REPLY_ECUSTOM		= 199,
 	SOCKCMD_REQUEST_LOGIN		= 200,
 	SOCKCMD_REQUEST_VERSION		= 201,
 	SOCKCMD_REQUEST_INFO		= 202,
+	SOCKCMD_REQUEST_DUMP		= 203,
 	SOCKCMD_REQUEST_DIE		= 210,
 	SOCKCMD_REQUEST_QUIT		= 250,
 	SOCKCMD_REPLY_LOGIN		= 300,
 	SOCKCMD_REPLY_VERSION		= 301,
 	SOCKCMD_REPLY_INFO		= 302,
+	SOCKCMD_REPLY_DUMP		= 303,
 	SOCKCMD_REPLY_DIE		= 310,
-	SOCKCMD_REPLY_UNEXPECTEDEND	= 300,
-	SOCKCMD_REPLY_QUIT		= 301,
 	SOCKCMD_REPLY_BYE		= 350,
+	SOCKCMD_REPLY_UNEXPECTEDEND	= 351,
 	SOCKCMD_MAXID
 };
 typedef enum sockcmd_id sockcmd_id_t;
@@ -132,11 +136,26 @@ struct sockcmd_dat_info {
 typedef struct sockcmd_dat_info sockcmd_dat_info_t;
 #endif
 
+struct sockcmd_dat_dump {
+	char		dir_path[PATH_MAX];
+};
+typedef struct sockcmd_dat_dump sockcmd_dat_dump_t;
+
+struct sockcmd_dat_eexist {
+	char		file_path[PATH_MAX];
+};
+typedef struct sockcmd_dat_eexist sockcmd_dat_eexist_t;
+
+struct sockcmd_dat_eperm {
+	char		descr[BUFSIZ];
+};
+typedef struct sockcmd_dat_eperm sockcmd_dat_eperm_t;
+
 struct sockcmd {
 	uint64_t	 cmd_num;
 	uint16_t	 cmd_id;
 	size_t		 data_len;
-	char		*data;
+	void		*data;
 };
 typedef struct sockcmd sockcmd_t;
 
diff --git a/sync.c b/sync.c
index 22d01cd..ae7ae05 100644
--- a/sync.c
+++ b/sync.c
@@ -803,11 +803,12 @@ static inline int so_call_sync(ctx_t *ctx_p, indexes_t *indexes_p, int n, api_ev
 	threadinfo_p->try_n       = 0;
 	threadinfo_p->callback    = NULL;
 	threadinfo_p->argv        = NULL;
-	threadinfo_p->ctx_p   = ctx_p;
+	threadinfo_p->ctx_p       = ctx_p;
 	threadinfo_p->starttime	  = time(NULL);
 	threadinfo_p->fpath2ei_ht = g_hash_table_dup(indexes_p->fpath2ei_ht, g_str_hash, g_str_equal, free, free, (gpointer(*)(gpointer))strdup, eidup);
 	threadinfo_p->n           = n;
 	threadinfo_p->ei          = ei;
+	threadinfo_p->iteration   = ctx_p->iteration_num;
 
 	if (ctx_p->synctimeout)
 		threadinfo_p->expiretime = threadinfo_p->starttime + ctx_p->synctimeout;
@@ -937,9 +938,10 @@ static inline int so_call_rsync(ctx_t *ctx_p, indexes_t *indexes_p, const char *
 	threadinfo_p->try_n       = 0;
 	threadinfo_p->callback    = NULL;
 	threadinfo_p->argv        = xmalloc(sizeof(char *) * 3);
-	threadinfo_p->ctx_p   = ctx_p;
+	threadinfo_p->ctx_p       = ctx_p;
 	threadinfo_p->starttime	  = time(NULL);
 	threadinfo_p->fpath2ei_ht = g_hash_table_dup(indexes_p->fpath2ei_ht, g_str_hash, g_str_equal, free, free, (gpointer(*)(gpointer))strdup, eidup);
+	threadinfo_p->iteration   = ctx_p->iteration_num;
 
 	threadinfo_p->argv[0]	  = strdup(inclistfile);
 	threadinfo_p->argv[1]	  = strdup(exclistfile);
@@ -1184,9 +1186,10 @@ static inline int sync_exec_thread(ctx_t *ctx_p, indexes_t *indexes_p, thread_ca
 	threadinfo_p->try_n       = 0;
 	threadinfo_p->callback    = callback;
 	threadinfo_p->argv        = argv;
-	threadinfo_p->ctx_p   = ctx_p;
+	threadinfo_p->ctx_p       = ctx_p;
 	threadinfo_p->starttime	  = time(NULL);
 	threadinfo_p->fpath2ei_ht = g_hash_table_dup(indexes_p->fpath2ei_ht, g_str_hash, g_str_equal, free, free, (gpointer(*)(gpointer))strdup, eidup);
+	threadinfo_p->iteration   = ctx_p->iteration_num;
 
 	if (ctx_p->synctimeout)
 		threadinfo_p->expiretime = threadinfo_p->starttime + ctx_p->synctimeout;
@@ -2678,14 +2681,14 @@ int sync_idle_dosync_collectedevents(ctx_t *ctx_p, indexes_t *indexes_p) {
 		g_hash_table_remove_all(indexes_p->fpath2ei_ht);
 	}
 
-	if (!ctx_p->flags[THREADING]) {
-		if(ctx_p->iteration_num < ~0) // ~0 is the max value for unsigned variables
-			ctx_p->iteration_num++;
+	if(ctx_p->iteration_num < ~0) // ~0 is the max value for unsigned variables
+		ctx_p->iteration_num++;
+
+	if (!ctx_p->flags[THREADING])
 		setenv_iteration(ctx_p->iteration_num); 
 
-		debug(3, "next iteration: %u/%u", 
-			ctx_p->iteration_num, ctx_p->flags[MAXITERATIONS]);
-	}
+	debug(3, "next iteration: %u/%u", 
+		ctx_p->iteration_num, ctx_p->flags[MAXITERATIONS]);
 
 	return 0;
 }
@@ -3306,9 +3309,9 @@ int sync_run(ctx_t *ctx_p) {
 	ret = pthread_sigmask(SIG_BLOCK, &sigset_sighandler, NULL);
 	if (ret) return ret;
 
-	sighandler_arg.ctx_p        =  ctx_p;
-//	sighandler_arg.indexes_p        = &indexes;
-	sighandler_arg.pthread_parent   =  pthread_self();
+	sighandler_arg.ctx_p		=  ctx_p;
+//	sighandler_arg.indexes_p	= &indexes;
+	sighandler_arg.pthread_parent	=  pthread_self();
 	sighandler_arg.exitcode_p	= &ret;
 	sighandler_arg.sigset_p		= &sigset_sighandler;
 	ret = pthread_create(&pthread_sighandler, NULL, (void *(*)(void *))sync_sighandler, &sighandler_arg);
@@ -3325,12 +3328,14 @@ int sync_run(ctx_t *ctx_p) {
 
 	// Creating hash tables
 
-	indexes_t indexes         = {NULL};
-	indexes.wd2fpath_ht       = g_hash_table_new_full(g_direct_hash, g_direct_equal, 0,    0);
-	indexes.fpath2wd_ht       = g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
-	indexes.fpath2ei_ht       = g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, free);
-	indexes.exc_fpath_ht      = g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
-	indexes.out_lines_aggr_ht = g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
+	indexes_t indexes         =  {NULL};
+	ctx_p->indexes_p	  = &indexes;
+
+	indexes.wd2fpath_ht	  =  g_hash_table_new_full(g_direct_hash, g_direct_equal, 0,    0);
+	indexes.fpath2wd_ht	  =  g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
+	indexes.fpath2ei_ht	  =  g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, free);
+	indexes.exc_fpath_ht	  =  g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
+	indexes.out_lines_aggr_ht =  g_hash_table_new_full(g_str_hash,	 g_str_equal,	 free, 0);
 	i=0;
 	while (i<QUEUE_MAX) {
 		switch (i) {
diff --git a/sync.h b/sync.h
index 10da9d0..b89c159 100644
--- a/sync.h
+++ b/sync.h
@@ -19,4 +19,5 @@
 
 extern int sync_run(struct ctx *ctx);
 extern int sync_term(int exitcode);
+extern int threads_foreach(int (*funct)(threadinfo_t *, void *), state_t state, void *arg);