Index: uspace/lib/c/generic/io/visualizer.c
===================================================================
--- uspace/lib/c/generic/io/visualizer.c	(revision 25a179efc4ecca45aa90793992b6c1c2743fd07f)
+++ uspace/lib/c/generic/io/visualizer.c	(revision 98893ede399d6eed12edddf404da1f101f415345)
@@ -39,23 +39,23 @@
 #include <io/visualizer.h>
 
-int visualizer_claim(async_sess_t *sess, sysarg_t notif_callback_id)
-{
-	async_exch_t *exch = async_exchange_begin(sess);
-	int ret = async_req_1_0(exch, VISUALIZER_CLAIM, notif_callback_id);
-	async_exchange_end(exch);
-
-	return ret;
-}
-
-int visualizer_yield(async_sess_t *sess)
-{
-	async_exch_t *exch = async_exchange_begin(sess);
-	int ret = async_req_0_0(exch, VISUALIZER_YIELD);
-	async_exchange_end(exch);
-
-	return ret;
-}
-
-int visualizer_enumerate_modes(async_sess_t *sess, vslmode_t *mode, sysarg_t nth)
+errno_t visualizer_claim(async_sess_t *sess, sysarg_t notif_callback_id)
+{
+	async_exch_t *exch = async_exchange_begin(sess);
+	errno_t ret = async_req_1_0(exch, VISUALIZER_CLAIM, notif_callback_id);
+	async_exchange_end(exch);
+
+	return ret;
+}
+
+errno_t visualizer_yield(async_sess_t *sess)
+{
+	async_exch_t *exch = async_exchange_begin(sess);
+	errno_t ret = async_req_0_0(exch, VISUALIZER_YIELD);
+	async_exchange_end(exch);
+
+	return ret;
+}
+
+errno_t visualizer_enumerate_modes(async_sess_t *sess, vslmode_t *mode, sysarg_t nth)
 {
 	async_exch_t *exch = async_exchange_begin(sess);
@@ -64,21 +64,21 @@
 	aid_t req = async_send_1(exch, VISUALIZER_ENUMERATE_MODES, nth, &answer);
 
-	int rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
-
-	async_exchange_end(exch);
-
-	int ret;
-	async_wait_for(req, &ret);
-
-	if (rc != EOK) {
-		return rc;
-	} else if (ret != EOK) {
-		return ret;
-	} else {
-		return EOK;
-	}
-}
-
-int visualizer_get_default_mode(async_sess_t *sess, vslmode_t *mode)
+	errno_t rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
+
+	async_exchange_end(exch);
+
+	errno_t ret;
+	async_wait_for(req, &ret);
+
+	if (rc != EOK) {
+		return rc;
+	} else if (ret != EOK) {
+		return ret;
+	} else {
+		return EOK;
+	}
+}
+
+errno_t visualizer_get_default_mode(async_sess_t *sess, vslmode_t *mode)
 {
 	async_exch_t *exch = async_exchange_begin(sess);
@@ -87,21 +87,21 @@
 	aid_t req = async_send_0(exch, VISUALIZER_GET_DEFAULT_MODE, &answer);
 
-	int rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
-
-	async_exchange_end(exch);
-
-	int ret;
-	async_wait_for(req, &ret);
-
-	if (rc != EOK) {
-		return rc;
-	} else if (ret != EOK) {
-		return ret;
-	} else {
-		return EOK;
-	}
-}
-
-int visualizer_get_current_mode(async_sess_t *sess, vslmode_t *mode)
+	errno_t rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
+
+	async_exchange_end(exch);
+
+	errno_t ret;
+	async_wait_for(req, &ret);
+
+	if (rc != EOK) {
+		return rc;
+	} else if (ret != EOK) {
+		return ret;
+	} else {
+		return EOK;
+	}
+}
+
+errno_t visualizer_get_current_mode(async_sess_t *sess, vslmode_t *mode)
 {
 	async_exch_t *exch = async_exchange_begin(sess);
@@ -110,21 +110,21 @@
 	aid_t req = async_send_0(exch, VISUALIZER_GET_CURRENT_MODE, &answer);
 
-	int rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
-
-	async_exchange_end(exch);
-
-	int ret;
-	async_wait_for(req, &ret);
-
-	if (rc != EOK) {
-		return rc;
-	} else if (ret != EOK) {
-		return ret;
-	} else {
-		return EOK;
-	}
-}
-
-int visualizer_get_mode(async_sess_t *sess, vslmode_t *mode, sysarg_t index)
+	errno_t rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
+
+	async_exchange_end(exch);
+
+	errno_t ret;
+	async_wait_for(req, &ret);
+
+	if (rc != EOK) {
+		return rc;
+	} else if (ret != EOK) {
+		return ret;
+	} else {
+		return EOK;
+	}
+}
+
+errno_t visualizer_get_mode(async_sess_t *sess, vslmode_t *mode, sysarg_t index)
 {
 	async_exch_t *exch = async_exchange_begin(sess);
@@ -133,21 +133,21 @@
 	aid_t req = async_send_1(exch, VISUALIZER_GET_MODE, index, &answer);
 
-	int rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
-
-	async_exchange_end(exch);
-
-	int ret;
-	async_wait_for(req, &ret);
-
-	if (rc != EOK) {
-		return rc;
-	} else if (ret != EOK) {
-		return ret;
-	} else {
-		return EOK;
-	}
-}
-
-int visualizer_set_mode(async_sess_t *sess, sysarg_t index, sysarg_t version, void *cells)
+	errno_t rc = async_data_read_start(exch, mode, sizeof(vslmode_t));
+
+	async_exchange_end(exch);
+
+	errno_t ret;
+	async_wait_for(req, &ret);
+
+	if (rc != EOK) {
+		return rc;
+	} else if (ret != EOK) {
+		return ret;
+	} else {
+		return EOK;
+	}
+}
+
+errno_t visualizer_set_mode(async_sess_t *sess, sysarg_t index, sysarg_t version, void *cells)
 {
 	async_exch_t *exch = async_exchange_begin(sess);
@@ -156,21 +156,21 @@
 	aid_t req = async_send_2(exch, VISUALIZER_SET_MODE, index, version, &answer);
 
-	int rc = async_share_out_start(exch, cells, AS_AREA_READ | AS_AREA_CACHEABLE);
-
-	async_exchange_end(exch);
-
-	int ret;
-	async_wait_for(req, &ret);
-
-	if (rc != EOK) {
-		return rc;
-	} else if (ret != EOK) {
-		return ret;
-	} else {
-		return EOK;
-	}
-}
-
-int visualizer_update_damaged_region(async_sess_t *sess,
+	errno_t rc = async_share_out_start(exch, cells, AS_AREA_READ | AS_AREA_CACHEABLE);
+
+	async_exchange_end(exch);
+
+	errno_t ret;
+	async_wait_for(req, &ret);
+
+	if (rc != EOK) {
+		return rc;
+	} else if (ret != EOK) {
+		return ret;
+	} else {
+		return EOK;
+	}
+}
+
+errno_t visualizer_update_damaged_region(async_sess_t *sess,
     sysarg_t x, sysarg_t y, sysarg_t width, sysarg_t height,
 	sysarg_t x_offset, sysarg_t y_offset)
@@ -182,5 +182,5 @@
 
 	async_exch_t *exch = async_exchange_begin(sess);
-	int ret = async_req_5_0(exch, VISUALIZER_UPDATE_DAMAGED_REGION,
+	errno_t ret = async_req_5_0(exch, VISUALIZER_UPDATE_DAMAGED_REGION,
 	    x, y, width, height, offsets);
 	async_exchange_end(exch);
@@ -189,17 +189,17 @@
 }
 
-int visualizer_suspend(async_sess_t *sess)
-{
-	async_exch_t *exch = async_exchange_begin(sess);
-	int ret = async_req_0_0(exch, VISUALIZER_SUSPEND);
-	async_exchange_end(exch);
-
-	return ret;
-}
-
-int visualizer_wakeup(async_sess_t *sess)
-{
-	async_exch_t *exch = async_exchange_begin(sess);
-	int ret = async_req_0_0(exch, VISUALIZER_WAKE_UP);
+errno_t visualizer_suspend(async_sess_t *sess)
+{
+	async_exch_t *exch = async_exchange_begin(sess);
+	errno_t ret = async_req_0_0(exch, VISUALIZER_SUSPEND);
+	async_exchange_end(exch);
+
+	return ret;
+}
+
+errno_t visualizer_wakeup(async_sess_t *sess)
+{
+	async_exch_t *exch = async_exchange_begin(sess);
+	errno_t ret = async_req_0_0(exch, VISUALIZER_WAKE_UP);
 	async_exchange_end(exch);