diff --git a/examples/tcp_client.zr b/examples/tcp_client.zr
index 3a33c8b..d6a013f 100644
--- a/examples/tcp_client.zr
+++ b/examples/tcp_client.zr
@@ -3,7 +3,18 @@ func main[] : I64
     if s < 0
         panic("socket() failed")
 
-    let sa: Ptr = _builtin_sa_from_addr("23.192.228.80", 80)
+    let port: I64 = 80
+    let sa: Ptr = calloc(16)
+    String.set(sa, 0, 2)
+    String.set(sa, 1, 0)
+    String.set(sa, 2, Bit.rshift(port, 8) && 255)
+    String.set(sa, 3, port && 255)
+    // 23.192.228.80
+    String.set(sa, 4, 23)
+    String.set(sa, 5, 192)
+    String.set(sa, 6, 228)
+    String.set(sa, 7, 80)
+
     if connect(s, sa, 16) < 0
         panic("connect() failed")
     free(sa)
diff --git a/examples/tcp_server.zr b/examples/tcp_server.zr
new file mode 100644
index 0000000..ded97d6
--- /dev/null
+++ b/examples/tcp_server.zr
@@ -0,0 +1,27 @@
+func main[] : I64
+    let s: I64 = socket(2, 1, 0)
+    if s < 0
+        panic("socket() failed")
+
+    let port: I64 = 8080
+    let sa: Ptr = calloc(16)
+    String.set(sa, 0, 2)
+    String.set(sa, 1, 0)
+    String.set(sa, 2, Bit.rshift(port, 8) && 255)
+    String.set(sa, 3, port && 255)
+
+    if bind(s, sa, 16) < 0
+        panic("bind() failed")
+
+    if listen(s, 1) < 0
+        panic("listen() failed")
+
+    let resp: String = malloc(60000)
+    while true
+        let c: I64 = accept(s, 0, 0)
+        if c < 0
+            panic("accept() failed")
+
+        let n: I64 = read(c, resp, 60000)
+        send(c, resp, n, 0)
+        close(c)
\ No newline at end of file
diff --git a/src/codegen_x86_64.rs b/src/codegen_x86_64.rs
index 88bd50b..7372539 100644
--- a/src/codegen_x86_64.rs
+++ b/src/codegen_x86_64.rs
@@ -130,6 +130,9 @@ extern socket
 extern send
 extern read
 extern close
+extern bind
+extern listen
+extern accept
 
 section .text._builtin_deref
 _builtin_deref:
@@ -251,28 +254,6 @@ _builtin_array_free:
     mov rdi, rbx
     pop rbx
     jmp free
-
-_builtin_sa_from_addr:
-    push r15
-    push r14
-    push rbx
-    mov rbx, rsi
-    mov r14, rdi
-    push 16
-    pop rdi
-    call malloc
-    mov r15, rax
-    mov dword [rax], 2
-    rol bx, 8
-    mov word [rax+2], bx
-    mov rdi, r14
-    call inet_addr
-    mov dword [r15+4], eax
-    mov rax, r15
-    pop rbx
-    pop r14
-    pop r15
-    ret
 "
         );
         Ok(())