diff --git a/func.S b/func.S
index 8d1ce22..05ae52d 100644
--- a/func.S
+++ b/func.S
@@ -17,7 +17,7 @@
 errstr: .ascii "error happened\n"
 .set errstr_len, .-errstr
 
-.set buffer_size, 1024
+.set buffer_size, 1024*1024
 buffer:	.skip buffer_size, 0
 
 .text
@@ -105,9 +105,7 @@ error:
 	movq $errstr, %rsi
 	movq $errstr_len, %rdx
 	syscall
-exit:
+
 	movq $__NR_exit, %rax
-	movq $0, %rdi
-	movq $0, %rsi
+	movq $2, %rdi
 	syscall
-	movq $0, 0
diff --git a/main.S b/main.S
index 73ae625..36fae61 100644
--- a/main.S
+++ b/main.S
@@ -8,7 +8,8 @@
 
 #define	PF_INET	2
 #define	AF_INET	PF_INET
-#define 	SOCK_STREAM	1
+#define	SOCK_STREAM	1
+#define	CLONE_PARENT	0x00008000
 
 #define	PORT	20335
 
@@ -100,8 +101,13 @@ loop:
 	movq $message_len, %rdx
 	call write_buf
 
-	movq $__NR_fork, %rax
-	syscall /* fork! */
+	movq $__NR_clone, %rax
+	movq $CLONE_PARENT, %rdi
+	movq $0, %rsi
+	movq $0, %rdx
+	movq $0, %r10
+	movq $0, %r8
+	syscall /* fork! (through clone()) */
 	cmp $-1, %rax
 	jz error
 	test %rax, %rax
@@ -135,7 +141,7 @@ error:
 	syscall
 
 	movq $__NR_exit, %rax
-	movq $0, %rdi
+	movq $1, %rdi
 	syscall
 /* this line is unreachable */