diff --git a/src/damon.c b/src/damon.c
index 9f8bf5f..49fac0f 100644
--- a/src/damon.c
+++ b/src/damon.c
@@ -78,7 +78,7 @@ static void _damon_destroy(DaMon * damon);
 
 static int _damon_perror(char const * message, int error);
 
-static int _damon_refresh(DaMon * damon);
+static int _rrd_update(DaMon * damon, char const * filename, int args_cnt, ...);
 
 
 /* functions */
@@ -130,6 +130,198 @@ Event * damon_get_event(DaMon * damon)
 }
 
 
+/* useful */
+/* damon_refresh */
+static AppClient * _refresh_connect(Host * host, Event * event);
+static int _refresh_uptime(AppClient * ac, Host * host, char * rrd);
+static int _refresh_load(AppClient * ac, Host * host, char * rrd);
+static int _refresh_ram(AppClient * ac, Host * host, char * rrd);
+static int _refresh_swap(AppClient * ac, Host * host, char * rrd);
+static int _refresh_procs(AppClient * ac, Host * host, char * rrd);
+static int _refresh_users(AppClient * ac, Host * host, char * rrd);
+static int _refresh_ifaces(AppClient * ac, Host * host, char * rrd);
+static int _refresh_vols(AppClient * ac, Host * host, char * rrd);
+
+int damon_refresh(DaMon * damon)
+{
+	unsigned int i;
+	AppClient * ac = NULL;
+	char * rrd = NULL;
+	char * p;
+	Host * hosts = damon->hosts;
+
+#ifdef DEBUG
+	fprintf(stderr, "DEBUG: %s()\n", __func__);
+#endif
+	for(i = 0; i < damon->hosts_cnt; i++)
+	{
+		if((ac = hosts[i].appclient) == NULL)
+			if((ac = _refresh_connect(&hosts[i], damon->event))
+					== NULL)
+				continue;
+		if((p = realloc(rrd, string_length(hosts[i].hostname) + 12))
+				== NULL) /* XXX avoid this constant */
+			break;
+		rrd = p;
+		if(_refresh_uptime(ac, &hosts[i], rrd) != 0
+				|| _refresh_load(ac, &hosts[i], rrd) != 0
+				|| _refresh_ram(ac, &hosts[i], rrd) != 0
+				|| _refresh_swap(ac, &hosts[i], rrd) != 0
+				|| _refresh_procs(ac, &hosts[i], rrd) != 0
+				|| _refresh_users(ac, &hosts[i], rrd) != 0
+				|| _refresh_ifaces(ac, &hosts[i], rrd) != 0
+				|| _refresh_vols(ac, &hosts[i], rrd) != 0)
+		{
+			appclient_delete(ac);
+			hosts[i].appclient = NULL;
+			continue;
+		}
+		ac = NULL;
+	}
+	free(rrd);
+	if(ac != NULL)
+		fprintf(stderr, "%s", "DaMon: refresh: An error occured\n");
+	return 0;
+}
+
+static AppClient * _refresh_connect(Host * host, Event * event)
+{
+	if(setenv("APPSERVER_Probe", host->hostname, 1) != 0)
+		return NULL;
+	if((host->appclient = appclient_new_event(NULL, "Probe", NULL, event))
+			== NULL)
+		error_print(PROGNAME);
+	return host->appclient;
+}
+
+static int _refresh_uptime(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t ret;
+
+	if(appclient_call(ac, (void **)&ret, "uptime") != 0)
+		return error_print(PROGNAME);
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "uptime.rrd");
+	_rrd_update(host->damon, rrd, 1, ret);
+	return 0;
+}
+
+static int _refresh_load(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t res;
+	uint32_t load[3];
+
+	if(appclient_call(ac, (void **)&res, "load", &load[0], &load[1],
+				&load[2]) != 0)
+		return error_print(PROGNAME);
+	if(res != 0)
+		return 0;
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "load.rrd");
+	_rrd_update(host->damon, rrd, 3, load[0], load[1], load[2]);
+	return 0;
+}
+
+static int _refresh_procs(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t res;
+
+	if(appclient_call(ac, (void **)&res, "procs") != 0)
+		return 1;
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "procs.rrd");
+	_rrd_update(host->damon, rrd, 1, res);
+	return 0;
+}
+
+static int _refresh_ram(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t res;
+	uint32_t ram[4];
+
+	if(appclient_call(ac, (void **)&res, "ram", &ram[0], &ram[1], &ram[2],
+				&ram[3]) != 0)
+		return 1;
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "ram.rrd");
+	_rrd_update(host->damon, rrd, 4, ram[0], ram[1], ram[2], ram[3]);
+	return 0;
+}
+
+static int _refresh_swap(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t res;
+	uint32_t swap[2];
+
+	if(appclient_call(ac, (void **)&res, "swap", &swap[0], &swap[1]) != 0)
+		return 1;
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "swap.rrd");
+	_rrd_update(host->damon, rrd, 2, swap[0], swap[1]);
+	return 0;
+}
+
+static int _refresh_users(AppClient * ac, Host * host, char * rrd)
+{
+	int32_t res;
+
+	if(appclient_call(ac, (void **)&res, "users") != 0)
+		return 1;
+	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "users.rrd");
+	_rrd_update(host->damon, rrd, 1, res);
+	return 0;
+}
+
+static int _ifaces_if(AppClient * ac, Host * host, char * rrd,
+		char const * iface);
+static int _refresh_ifaces(AppClient * ac, Host * host, char * rrd)
+{
+	char ** p = host->ifaces;
+	int ret = 0;
+
+	if(p == NULL)
+		return 0;
+	for(; *p != NULL; p++)
+		ret |= _ifaces_if(ac, host, rrd, *p);
+	return ret;
+}
+
+static int _ifaces_if(AppClient * ac, Host * host, char * rrd,
+		char const * iface)
+{
+	int32_t res[2];
+
+	if(appclient_call(ac, (void **)&res[0], "ifrxbytes", iface) != 0
+			|| appclient_call(ac, (void **)&res[1], "iftxbytes",
+				iface) != 0)
+		return 1;
+	sprintf(rrd, "%s%c%s%s", host->hostname, DAMON_SEP, iface, ".rrd");
+	_rrd_update(host->damon, rrd, 2, res[0], res[1]);
+	return 0;
+}
+
+static int _vols_vol(AppClient * ac, Host * host, char * rrd, char * vol);
+static int _refresh_vols(AppClient * ac, Host * host, char * rrd)
+{
+	char ** p = host->vols;
+	int ret = 0;
+
+	if(p == NULL)
+		return 0;
+	for(; *p != NULL; p++)
+		ret |= _vols_vol(ac, host, rrd, *p);
+	return ret;
+}
+
+static int _vols_vol(AppClient * ac, Host * host, char * rrd, char * vol)
+{
+	int32_t res[2];
+
+	if(appclient_call(ac, (void **)&res[0], "voltotal", vol) != 0
+			|| appclient_call(ac, (void **)&res[1], "volfree", vol)
+			!= 0)
+		return 1;
+	sprintf(rrd, "%s%s%s", host->hostname, vol, ".rrd"); /* FIXME */
+	_rrd_update(host->damon, rrd, 2, res[0], res[1]);
+	return 0;
+}
+
+
 /* private */
 /* functions */
 /* damon_init */
@@ -144,11 +336,11 @@ static int _damon_init(DaMon * damon, char const * config, Event * event)
 	if(_init_config(damon, config) != 0)
 		return 1;
 	damon->event = event;
-	_damon_refresh(damon);
+	damon_refresh(damon);
 	tv.tv_sec = damon->refresh;
 	tv.tv_usec = 0;
 	event_register_timeout(damon->event, &tv,
-			(EventTimeoutFunc)_damon_refresh, damon);
+			(EventTimeoutFunc)damon_refresh, damon);
 	return 0;
 }
 
@@ -322,198 +514,9 @@ static int _damon_perror(char const * message, int ret)
 }
 
 
-/* damon_refresh */
-static AppClient * _refresh_connect(Host * host, Event * event);
-static int _refresh_uptime(AppClient * ac, Host * host, char * rrd);
-static int _refresh_load(AppClient * ac, Host * host, char * rrd);
-static int _refresh_ram(AppClient * ac, Host * host, char * rrd);
-static int _refresh_swap(AppClient * ac, Host * host, char * rrd);
-static int _refresh_procs(AppClient * ac, Host * host, char * rrd);
-static int _refresh_users(AppClient * ac, Host * host, char * rrd);
-static int _refresh_ifaces(AppClient * ac, Host * host, char * rrd);
-static int _refresh_vols(AppClient * ac, Host * host, char * rrd);
+/* rrd_update */
+static int _update_exec(char * argv[]);
 
-static int _damon_refresh(DaMon * damon)
-{
-	unsigned int i;
-	AppClient * ac = NULL;
-	char * rrd = NULL;
-	char * p;
-	Host * hosts = damon->hosts;
-
-#ifdef DEBUG
-	fprintf(stderr, "DEBUG: %s()\n", __func__);
-#endif
-	for(i = 0; i < damon->hosts_cnt; i++)
-	{
-		if((ac = hosts[i].appclient) == NULL)
-			if((ac = _refresh_connect(&hosts[i], damon->event))
-					== NULL)
-				continue;
-		if((p = realloc(rrd, string_length(hosts[i].hostname) + 12))
-				== NULL) /* XXX avoid this constant */
-			break;
-		rrd = p;
-		if(_refresh_uptime(ac, &hosts[i], rrd) != 0
-				|| _refresh_load(ac, &hosts[i], rrd) != 0
-				|| _refresh_ram(ac, &hosts[i], rrd) != 0
-				|| _refresh_swap(ac, &hosts[i], rrd) != 0
-				|| _refresh_procs(ac, &hosts[i], rrd) != 0
-				|| _refresh_users(ac, &hosts[i], rrd) != 0
-				|| _refresh_ifaces(ac, &hosts[i], rrd) != 0
-				|| _refresh_vols(ac, &hosts[i], rrd) != 0)
-		{
-			appclient_delete(ac);
-			hosts[i].appclient = NULL;
-			continue;
-		}
-		ac = NULL;
-	}
-	free(rrd);
-	if(ac != NULL)
-		fprintf(stderr, "%s", "DaMon: refresh: An error occured\n");
-	return 0;
-}
-
-static AppClient * _refresh_connect(Host * host, Event * event)
-{
-	if(setenv("APPSERVER_Probe", host->hostname, 1) != 0)
-		return NULL;
-	if((host->appclient = appclient_new_event(NULL, "Probe", NULL, event))
-			== NULL)
-		error_print(PROGNAME);
-	return host->appclient;
-}
-
-static int _rrd_update(DaMon * damon, char const * filename, int args_cnt, ...);
-static int _refresh_uptime(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t ret;
-
-	if(appclient_call(ac, (void **)&ret, "uptime") != 0)
-		return error_print(PROGNAME);
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "uptime.rrd");
-	_rrd_update(host->damon, rrd, 1, ret);
-	return 0;
-}
-
-static int _refresh_load(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t res;
-	uint32_t load[3];
-
-	if(appclient_call(ac, (void **)&res, "load", &load[0], &load[1],
-				&load[2]) != 0)
-		return error_print(PROGNAME);
-	if(res != 0)
-		return 0;
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "load.rrd");
-	_rrd_update(host->damon, rrd, 3, load[0], load[1], load[2]);
-	return 0;
-}
-
-static int _refresh_procs(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t res;
-
-	if(appclient_call(ac, (void **)&res, "procs") != 0)
-		return 1;
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "procs.rrd");
-	_rrd_update(host->damon, rrd, 1, res);
-	return 0;
-}
-
-static int _refresh_ram(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t res;
-	uint32_t ram[4];
-
-	if(appclient_call(ac, (void **)&res, "ram", &ram[0], &ram[1], &ram[2],
-				&ram[3]) != 0)
-		return 1;
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "ram.rrd");
-	_rrd_update(host->damon, rrd, 4, ram[0], ram[1], ram[2], ram[3]);
-	return 0;
-}
-
-static int _refresh_swap(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t res;
-	uint32_t swap[2];
-
-	if(appclient_call(ac, (void **)&res, "swap", &swap[0], &swap[1]) != 0)
-		return 1;
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "swap.rrd");
-	_rrd_update(host->damon, rrd, 2, swap[0], swap[1]);
-	return 0;
-}
-
-static int _refresh_users(AppClient * ac, Host * host, char * rrd)
-{
-	int32_t res;
-
-	if(appclient_call(ac, (void **)&res, "users") != 0)
-		return 1;
-	sprintf(rrd, "%s%c%s", host->hostname, DAMON_SEP, "users.rrd");
-	_rrd_update(host->damon, rrd, 1, res);
-	return 0;
-}
-
-static int _ifaces_if(AppClient * ac, Host * host, char * rrd,
-		char const * iface);
-static int _refresh_ifaces(AppClient * ac, Host * host, char * rrd)
-{
-	char ** p = host->ifaces;
-	int ret = 0;
-
-	if(p == NULL)
-		return 0;
-	for(; *p != NULL; p++)
-		ret |= _ifaces_if(ac, host, rrd, *p);
-	return ret;
-}
-
-static int _ifaces_if(AppClient * ac, Host * host, char * rrd,
-		char const * iface)
-{
-	int32_t res[2];
-
-	if(appclient_call(ac, (void **)&res[0], "ifrxbytes", iface) != 0
-			|| appclient_call(ac, (void **)&res[1], "iftxbytes",
-				iface) != 0)
-		return 1;
-	sprintf(rrd, "%s%c%s%s", host->hostname, DAMON_SEP, iface, ".rrd");
-	_rrd_update(host->damon, rrd, 2, res[0], res[1]);
-	return 0;
-}
-
-static int _vols_vol(AppClient * ac, Host * host, char * rrd, char * vol);
-static int _refresh_vols(AppClient * ac, Host * host, char * rrd)
-{
-	char ** p = host->vols;
-	int ret = 0;
-
-	if(p == NULL)
-		return 0;
-	for(; *p != NULL; p++)
-		ret |= _vols_vol(ac, host, rrd, *p);
-	return ret;
-}
-
-static int _vols_vol(AppClient * ac, Host * host, char * rrd, char * vol)
-{
-	int32_t res[2];
-
-	if(appclient_call(ac, (void **)&res[0], "voltotal", vol) != 0
-			|| appclient_call(ac, (void **)&res[1], "volfree", vol)
-			!= 0)
-		return 1;
-	sprintf(rrd, "%s%s%s", host->hostname, vol, ".rrd"); /* FIXME */
-	_rrd_update(host->damon, rrd, 2, res[0], res[1]);
-	return 0;
-}
-
-static int _exec(char * argv[]);
 static int _rrd_update(DaMon * damon, char const * filename, int args_cnt, ...)
 {
 	char * argv[] = { RRDTOOL, "update", NULL, NULL, NULL };
@@ -533,13 +536,13 @@ static int _rrd_update(DaMon * damon, char const * filename, int args_cnt, ...)
 	for(i = 0; i < args_cnt; i++)
 		pos += sprintf(&argv[3][pos], ":%u", va_arg(args, unsigned));
 	va_end(args);
-	ret = _exec(argv);
+	ret = _update_exec(argv);
 	free(argv[3]);
 	string_delete(argv[2]);
 	return ret;
 }
 
-static int _exec(char * argv[])
+static int _update_exec(char * argv[])
 {
 	pid_t pid;
 	int status;
diff --git a/src/damon.h b/src/damon.h
index aa74f99..58fb906 100644
--- a/src/damon.h
+++ b/src/damon.h
@@ -34,4 +34,7 @@ void damon_delete(DaMon * damon);
 /* accessors */
 Event * damon_get_event(DaMon * damon);
 
+/* useful */
+int damon_refresh(DaMon * damon);
+
 #endif /* !DAMON_DAMON_H */