diff --git a/src/driver/mod.rs b/src/driver/mod.rs
index 40e443e..46c196c 100644
--- a/src/driver/mod.rs
+++ b/src/driver/mod.rs
@@ -17,11 +17,7 @@ fn ifreq_for(name: &str) -> ifreq {
     ifreq
 }
 
-fn ifreq_ioctl(
-    lower: libc::c_int,
-    cmd: libc::c_ulong,
-    ifreq: &mut ifreq,
-) -> io::Result<i32> {
+fn ifreq_ioctl(lower: libc::c_int, cmd: libc::c_ulong, ifreq: &mut ifreq) -> io::Result<i32> {
     unsafe {
         let res = libc::ioctl(lower, cmd as _, ifreq as *mut ifreq);
         if res == -1 {
diff --git a/src/driver/tap.rs b/src/driver/tap.rs
index 58c8ba9..7b7ea3d 100644
--- a/src/driver/tap.rs
+++ b/src/driver/tap.rs
@@ -92,7 +92,7 @@ impl TapDesc {
         let mac = smoltcp::wire::EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x01]);
 
         unsafe {
-            ifr.ifr_ifru.ifru_hwaddr.sa_family = libc::ARPHRD_ETHER as u16;
+            ifr.ifr_ifru.ifru_hwaddr.sa_family = libc::ARPHRD_ETHER;
             ifr.ifr_ifru.ifru_hwaddr.sa_data[..6]
                 .copy_from_slice(&[0x02, 0x00, 0x00, 0x00, 0x00, 0x01]);
         }
diff --git a/src/libs/wait_queue.rs b/src/libs/wait_queue.rs
index d539295..0974de7 100644
--- a/src/libs/wait_queue.rs
+++ b/src/libs/wait_queue.rs
@@ -1,8 +1,4 @@
-use std::{
-    sync::atomic::AtomicBool,
-    thread::sleep,
-    time::Duration,
-};
+use std::{sync::atomic::AtomicBool, thread::sleep, time::Duration};
 
 use linux_errnos::Errno;
 
diff --git a/src/main.rs b/src/main.rs
index b196eb8..9dcdbd0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,20 +1,91 @@
 use std::{net::Ipv4Addr, sync::Arc};
 
 use berkeley_socket::{
-    driver::{irq::start_network_polling_thread, tap::TapDevice}, interface::{tap::TapIface, Iface}, posix::SOCK, socket::{endpoint::Endpoint, inet::{common::NET_DEVICES, syscall::Inet}, Family}
+    driver::{irq::start_network_polling_thread, tap::TapDevice},
+    interface::{tap::TapIface, Iface},
+    posix::SOCK,
+    socket::{
+        endpoint::Endpoint,
+        inet::{common::NET_DEVICES, syscall::Inet},
+        Family,
+    },
 };
-use smoltcp::wire::{IpAddress, IpEndpoint, Ipv4Cidr, IpCidr};
+use smoltcp::wire::{IpAddress, IpCidr, IpEndpoint, Ipv4Cidr};
 use spin::Mutex;
 
+fn make_udp_echo() {
+    let socket = Inet::socket(SOCK::Datagram, 0).unwrap();
+    socket
+        .bind(Endpoint::Ip(IpEndpoint::new(
+            IpAddress::v4(192, 168, 213, 2),
+            1234,
+        )))
+        .unwrap();
+    socket
+        .connect(Endpoint::Ip(IpEndpoint::new(
+            IpAddress::v4(192, 168, 213, 3),
+            12345,
+        )))
+        .unwrap();
+    let mut buffer = [0u8; 1024];
+
+    loop {
+        let len = socket.read(&mut buffer).unwrap();
+        log::info!(
+            "Received {} bytes: {}",
+            len,
+            String::from_utf8_lossy(&buffer[..len])
+        );
+        let len = socket.write(&buffer[..len]).unwrap();
+        log::info!(
+            "Sent {} bytes: {}",
+            len,
+            String::from_utf8_lossy(&buffer[..len])
+        );
+    }
+}
+
+fn make_tcp_echo() {
+    let socket = Inet::socket(SOCK::Stream, 0).unwrap();
+    socket
+        .bind(Endpoint::Ip(IpEndpoint::new(
+            IpAddress::v4(192, 168, 213, 2),
+            4321,
+        )))
+        .unwrap();
+    socket.listen(1).unwrap();
+
+    loop {
+        let (client_socket, _) = socket.accept().unwrap();
+        log::info!("Accepted connection from {:?}", client_socket);
+        let mut buffer = [0u8; 1024];
+
+        loop {
+            let len = client_socket.read(&mut buffer).unwrap();
+            if len == 0 {
+                break;
+            }
+            log::info!(
+                "Received {} bytes: {}",
+                len,
+                String::from_utf8_lossy(&buffer[..len])
+            );
+            let len = client_socket.write(&buffer[..len]).unwrap();
+            log::info!(
+                "Sent {} bytes: {}",
+                len,
+                String::from_utf8_lossy(&buffer[..len])
+            );
+        }
+    }
+}
+
 fn main() {
     env_logger::init();
     let device = TapDevice::new("tap0", smoltcp::phy::Medium::Ethernet).unwrap();
     let iface_inner = TapIface::new(Arc::new(Mutex::new(device)));
 
-    let ip_cidr = IpCidr::Ipv4(Ipv4Cidr::new(
-        Ipv4Addr::new(192, 168, 213, 2),
-        24
-    ));
+    let ip_cidr = IpCidr::Ipv4(Ipv4Cidr::new(Ipv4Addr::new(192, 168, 213, 2), 24));
 
     let ip_cidr = vec![ip_cidr];
 
@@ -28,17 +99,12 @@ fn main() {
     });
     let _ = start_network_polling_thread();
 
-    let socket = Inet::socket(SOCK::Datagram, 0).unwrap();
-    socket.bind(Endpoint::Ip(
-        IpEndpoint::new(
-            IpAddress::v4(192, 168, 213, 2), 
-            1234,
-        )
-    )).unwrap();
-    let mut buffer = [0u8; 1024];
-    
-    loop {
-        let len = socket.read(&mut buffer).unwrap();
-        log::info!("Received {} bytes: {}", len, String::from_utf8_lossy(&buffer[..len]));
-    }
+    let udp = std::thread::spawn(move || {
+        make_udp_echo();
+    });
+    let tcp = std::thread::spawn(move || {
+        make_tcp_echo();
+    });
+    udp.join().unwrap();
+    tcp.join().unwrap();
 }
diff --git a/src/socket/inet/datagram/inner.rs b/src/socket/inet/datagram/inner.rs
index 2d537b9..da21c3b 100644
--- a/src/socket/inet/datagram/inner.rs
+++ b/src/socket/inet/datagram/inner.rs
@@ -134,7 +134,7 @@ impl BoundUdp {
         to: Option<smoltcp::wire::IpEndpoint>,
     ) -> Result<usize, SystemError> {
         let remote = to.or(*self.remote.lock()).ok_or(SystemError::ENOTCONN)?;
-        
+
         self.with_mut_socket(|socket| {
             if socket.can_send() && socket.send_slice(buf, remote).is_ok() {
                 log::debug!("send {} bytes", buf.len());
diff --git a/src/socket/inet/datagram/mod.rs b/src/socket/inet/datagram/mod.rs
index 4dd58ae..b952bec 100644
--- a/src/socket/inet/datagram/mod.rs
+++ b/src/socket/inet/datagram/mod.rs
@@ -273,8 +273,7 @@ impl Socket for UdpSocket {
 }
 
 impl InetSocket for UdpSocket {
-    fn on_iface_events(&self) {
-    }
+    fn on_iface_events(&self) {}
 }
 
 bitflags::bitflags! {
diff --git a/src/socket/inet/mod.rs b/src/socket/inet/mod.rs
index 45937d6..70fd0c0 100644
--- a/src/socket/inet/mod.rs
+++ b/src/socket/inet/mod.rs
@@ -4,21 +4,21 @@ use smoltcp;
 // pub mod icmp;
 pub mod common;
 pub mod datagram;
-// pub mod stream;
 pub mod posix;
+pub mod stream;
 pub mod syscall;
 
 pub use common::BoundInner;
 pub use common::Types;
 // pub use raw::RawSocket;
 pub use datagram::UdpSocket;
+pub use stream::TcpSocket;
 
 use smoltcp::wire::IpAddress;
 use smoltcp::wire::IpEndpoint;
 use smoltcp::wire::Ipv4Address;
 // use smoltcp::wire::Ipv6Address;
 
-// pub use stream::TcpSocket;
 // pub use syscall::Inet;
 
 use super::Socket;
diff --git a/src/socket/inet/stream/inner.rs b/src/socket/inet/stream/inner.rs
index 10d02f5..9e5e44b 100644
--- a/src/socket/inet/stream/inner.rs
+++ b/src/socket/inet/stream/inner.rs
@@ -1,13 +1,14 @@
 use core::sync::atomic::AtomicUsize;
 
+use crate::event_poll::EPollEventType;
 use crate::libs::rwlock::RwLock;
 // use crate::net::socket::EPollEventType;
 use crate::socket::{self, inet::Types};
 use alloc::boxed::Box;
 use alloc::vec::Vec;
+use linux_errnos::Errno as SystemError;
 use smoltcp;
 use smoltcp::socket::tcp;
-use linux_errnos::Errno as SystemError;
 
 // pub const DEFAULT_METADATA_BUF_SIZE: usize = 1024;
 pub const DEFAULT_RX_BUF_SIZE: usize = 512 * 1024;
@@ -163,11 +164,11 @@ impl Init {
         }
 
         inners.push(inner);
-        return Ok(Listening {
+        Ok(Listening {
             inners,
             connect: AtomicUsize::new(0),
             listen_addr,
-        });
+        })
     }
 
     pub(super) fn close(&self) {
@@ -213,10 +214,7 @@ impl Connecting {
     pub fn into_result(self) -> (Inner, Result<(), SystemError>) {
         let result = *self.result.read();
         match result {
-            ConnectResult::Connecting => (
-                Inner::Connecting(self),
-                Err(SystemError::EAGAIN_OR_EWOULDBLOCK),
-            ),
+            ConnectResult::Connecting => (Inner::Connecting(self), Err(SystemError::EAGAIN)),
             ConnectResult::Connected => (
                 Inner::Established(Established { inner: self.inner }),
                 Ok(()),
@@ -264,7 +262,7 @@ impl Connecting {
                 }
                 // Refused
                 *result = ConnectResult::Refused;
-                return true;
+                true
             })
     }
 
@@ -302,7 +300,7 @@ impl Listening {
             .unwrap();
 
         if connected.with::<smoltcp::socket::tcp::Socket, _, _>(|socket| !socket.is_active()) {
-            return Err(SystemError::EAGAIN_OR_EWOULDBLOCK);
+            return Err(SystemError::EAGAIN);
         }
 
         let remote_endpoint = connected.with::<smoltcp::socket::tcp::Socket, _, _>(|socket| {
@@ -327,7 +325,7 @@ impl Listening {
         // TODO is smoltcp socket swappable?
         core::mem::swap(&mut new_listen, connected);
 
-        return Ok((Established { inner: new_listen }, remote_endpoint));
+        Ok((Established { inner: new_listen }, remote_endpoint))
     }
 
     pub fn update_io_events(&self, pollee: &AtomicUsize) {
diff --git a/src/socket/inet/stream/mod.rs b/src/socket/inet/stream/mod.rs
index 4447079..26c1cbd 100644
--- a/src/socket/inet/stream/mod.rs
+++ b/src/socket/inet/stream/mod.rs
@@ -1,14 +1,14 @@
 use alloc::sync::{Arc, Weak};
 use core::sync::atomic::{AtomicBool, AtomicUsize};
-use system_error::SystemError;
+use linux_errnos::Errno as SystemError;
 
-use crate::libs::wait_queue::WaitQueue;
+use crate::libs::wait_queue::{wq_wait_event_interruptible, WaitQueue};
 // use crate::event_poll::EPollEventType;
 use crate::socket::common::shutdown::{ShutdownBit, ShutdownTemp};
 use crate::socket::endpoint::Endpoint;
 use crate::socket::{Socket, PMSG, PSOL};
 // use crate::sched::SchedMode;
-use crate::{libs::rwlock::RwLock, net::socket::common::shutdown::Shutdown};
+use crate::{libs::rwlock::RwLock, socket::common::shutdown::Shutdown};
 use smoltcp;
 
 mod inner;
@@ -18,7 +18,7 @@ pub use option::Options as TcpOption;
 
 use super::{InetSocket, UNSPECIFIED_LOCAL_ENDPOINT_V4};
 
-type EP = EPollEventType;
+type EP = crate::event_poll::EPollEventType;
 #[derive(Debug)]
 pub struct TcpSocket {
     inner: RwLock<Option<inner::Inner>>,
@@ -98,7 +98,7 @@ impl TcpSocket {
         if let Some(err) = err {
             return Err(err);
         }
-        return Ok(());
+        Ok(())
     }
 
     pub fn try_accept(&self) -> Result<(Arc<TcpSocket>, smoltcp::wire::IpEndpoint), SystemError> {
@@ -161,7 +161,7 @@ impl TcpSocket {
         }
 
         writer.replace(init);
-        return result;
+        result
     }
 
     // for irq use
@@ -297,7 +297,7 @@ impl Socket for TcpSocket {
             return self.do_bind(addr);
         }
         log::debug!("TcpSocket::bind: invalid endpoint");
-        return Err(SystemError::EINVAL);
+        Err(SystemError::EINVAL)
     }
 
     fn connect(&self, endpoint: Endpoint) -> Result<(), SystemError> {
@@ -307,12 +307,12 @@ impl Socket for TcpSocket {
         };
         self.start_connect(endpoint)?; // Only Nonblock or error will return error.
 
-        return loop {
+        loop {
             match self.check_connect() {
-                Err(SystemError::EAGAIN_OR_EWOULDBLOCK) => {}
+                Err(SystemError::EAGAIN) => {}
                 result => break result,
             }
-        };
+        }
     }
 
     fn poll(&self) -> usize {
@@ -323,20 +323,20 @@ impl Socket for TcpSocket {
         self.do_listen(backlog)
     }
 
-    fn accept(&self) -> Result<(Arc<SocketInode>, Endpoint), SystemError> {
+    fn accept(&self) -> Result<(Arc<dyn Socket>, Endpoint), SystemError> {
         if self.is_nonblock() {
             self.try_accept()
         } else {
             loop {
                 match self.try_accept() {
-                    Err(SystemError::EAGAIN_OR_EWOULDBLOCK) => {
-                        wq_wait_event_interruptible!(self.wait_queue, self.incoming(), {})?;
+                    Err(SystemError::EAGAIN) => {
+                        wq_wait_event_interruptible(&self.wait_queue, || self.incoming(), None)?;
                     }
                     result => break result,
                 }
             }
         }
-        .map(|(inner, endpoint)| (SocketInode::new(inner), Endpoint::Ip(endpoint)))
+        .map(|(inner, endpoint)| (inner as Arc<dyn Socket>, Endpoint::Ip(endpoint)))
     }
 
     fn recv(&self, buffer: &mut [u8], _flags: PMSG) -> Result<usize, SystemError> {
diff --git a/src/socket/inet/syscall.rs b/src/socket/inet/syscall.rs
index f9fd6fa..528feb7 100644
--- a/src/socket/inet/syscall.rs
+++ b/src/socket/inet/syscall.rs
@@ -5,7 +5,7 @@ use smoltcp::{self, wire::IpProtocol};
 use crate::{
     posix::SOCK,
     socket::{
-        inet::UdpSocket,
+        inet::{TcpSocket, UdpSocket},
         Family,
         Socket, // SocketInode,
     },
@@ -19,28 +19,22 @@ fn create_inet_socket(
     // log::debug!("type: {:?}, protocol: {:?}", socket_type, protocol);
     match socket_type {
         SOCK::Datagram => match protocol {
-            IpProtocol::HopByHop | IpProtocol::Udp => {
-                Ok(UdpSocket::new(false))
+            IpProtocol::HopByHop | IpProtocol::Udp => Ok(UdpSocket::new(false)),
+            _ => Err(SystemError::EPROTONOSUPPORT),
+        },
+        SOCK::Stream => match protocol {
+            IpProtocol::HopByHop | IpProtocol::Tcp => {
+                log::debug!("create tcp socket");
+                Ok(TcpSocket::new(false, version))
             }
             _ => {
                 Err(SystemError::EPROTONOSUPPORT)
             }
         },
-        // SOCK::Stream => match protocol {
-        //     IpProtocol::HopByHop | IpProtocol::Tcp => {
-        //         log::debug!("create tcp socket");
-        //         return Ok(TcpSocket::new(false, version));
-        //     }
-        //     _ => {
-        //         return Err(SystemError::EPROTONOSUPPORT);
-        //     }
-        // },
         SOCK::Raw => {
             todo!("raw")
         }
-        _ => {
-            Err(SystemError::EPROTONOSUPPORT)
-        }
+        _ => Err(SystemError::EPROTONOSUPPORT),
     }
 }
 
diff --git a/src/socket/mod.rs b/src/socket/mod.rs
index 3d7a7ce..6a81799 100644
--- a/src/socket/mod.rs
+++ b/src/socket/mod.rs
@@ -33,9 +33,9 @@ pub trait Socket: Sync + Send + Debug + Any {
     // /// 接受连接，仅用于listening stream socket
     // /// ## Block
     // /// 如果没有连接到来，会阻塞
-    // fn accept(&self) -> Result<(Arc<SocketInode>, Endpoint), SystemError> {
-    //     Err(SystemError::ENOSYS)
-    // }
+    fn accept(&self) -> Result<(Arc<dyn Socket>, Endpoint), SystemError> {
+        Err(SystemError::ENOSYS)
+    }
     /// # `bind`
     /// 对应于POSIX的bind函数，用于绑定到本机指定的端点
     fn bind(&self, endpoint: Endpoint) -> Result<(), SystemError> {