Index: uspace/app/tester/ipc/answer.c
===================================================================
--- uspace/app/tester/ipc/answer.c	(revision 32099239a6124d59220f89570e99659141d22ed7)
+++ uspace/app/tester/ipc/answer.c	(revision 8498915fcb2cf4aa2a0cc399866d4191c963b740)
@@ -47,5 +47,5 @@
 	}
 	if (!cnt)
-		return;
+		return NULL;
 	printf("Choose message:\n");
 	do {
@@ -70,5 +70,5 @@
 		errn = ENOENT;
 	printf("Answering %P\n", callids[i]);
-	ipc_answer_fast(callids[i], errn, 0, 0);
+	ipc_answer_0(callids[i], errn);
 	callids[i] = 0;
 	
Index: uspace/app/tester/ipc/register.c
===================================================================
--- uspace/app/tester/ipc/register.c	(revision 32099239a6124d59220f89570e99659141d22ed7)
+++ uspace/app/tester/ipc/register.c	(revision 8498915fcb2cf4aa2a0cc399866d4191c963b740)
@@ -30,4 +30,5 @@
 #include <unistd.h>
 #include <async.h>
+#include <errno.h>
 #include "../tester.h"
 
@@ -41,5 +42,5 @@
 
 	printf("Connected phone: %P, accepting\n", icall->in_phone_hash);
-	ipc_answer_fast(iid, 0, 0, 0);
+	ipc_answer_0(iid, EOK);
 	for (i = 0; i < 1024; i++)
 		if (!connections[i]) {
@@ -56,5 +57,6 @@
 			break;
 		default:
-			printf("Received message from %P: %X\n", phonehash,callid);
+			printf("Received message from %P: %X\n", phonehash,
+			    callid);
 			for (i = 0; i < 1024; i++)
 				if (!callids[i]) {
@@ -64,5 +66,5 @@
 			continue;
 		}
-		ipc_answer_fast(callid, retval, 0, 0);
+		ipc_answer_0(callid, retval);
 	}
 }
Index: uspace/app/tester/ipc/send_async.c
===================================================================
--- uspace/app/tester/ipc/send_async.c	(revision 32099239a6124d59220f89570e99659141d22ed7)
+++ uspace/app/tester/ipc/send_async.c	(revision 8498915fcb2cf4aa2a0cc399866d4191c963b740)
@@ -39,5 +39,4 @@
 {
 	int phoneid;
-	int res;
 	static int msgid = 1;
 	char c;