diff --git a/_typos.toml b/_typos.toml
index dfd475b..567e835 100644
--- a/_typos.toml
+++ b/_typos.toml
@@ -2,3 +2,6 @@
 
 [files]
 extend-exclude = ["go.mod", "go.sum"]
+
+[default.extend-words]
+typ = "typ"   # type
\ No newline at end of file
diff --git a/connstate/conn.go b/connstate/conn.go
new file mode 100644
index 0000000..b7f52ff
--- /dev/null
+++ b/connstate/conn.go
@@ -0,0 +1,103 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"errors"
+	"net"
+	"sync/atomic"
+	"syscall"
+	"unsafe"
+)
+
+type ConnState uint32
+
+const (
+	// StateOK means the connection is normal.
+	StateOK ConnState = iota
+	// StateRemoteClosed means the remote side has closed the connection.
+	StateRemoteClosed
+	// StateClosed means the connection has been closed by local side.
+	StateClosed
+)
+
+// ConnStater is the interface to get the ConnState of a connection.
+// Must call Close to release it if you're going to close the connection.
+type ConnStater interface {
+	Close() error
+	State() ConnState
+}
+
+// ListenConnState returns a ConnStater for the given connection.
+// It's generally used for availability checks when obtaining connections from a connection pool.
+// Conn must be a syscall.Conn.
+func ListenConnState(conn net.Conn) (ConnStater, error) {
+	pollInitOnce.Do(createPoller)
+	sysConn, ok := conn.(syscall.Conn)
+	if !ok {
+		return nil, errors.New("conn is not syscall.Conn")
+	}
+	rawConn, err := sysConn.SyscallConn()
+	if err != nil {
+		return nil, err
+	}
+	var fd *fdOperator
+	var opAddErr error
+	err = rawConn.Control(func(fileDescriptor uintptr) {
+		fd = pollcache.alloc()
+		fd.fd = int(fileDescriptor)
+		atomic.StorePointer(&fd.conn, unsafe.Pointer(&connStater{fd: unsafe.Pointer(fd)}))
+		opAddErr = poll.control(fd, opAdd)
+	})
+	if fd != nil {
+		if err != nil && opAddErr == nil {
+			// if rawConn is closed, poller will delete the fd by itself
+			_ = rawConn.Control(func(_ uintptr) {
+				_ = poll.control(fd, opDel)
+			})
+		}
+		if err != nil || opAddErr != nil {
+			atomic.StorePointer(&fd.conn, nil)
+			pollcache.freeable(fd)
+		}
+	}
+	if err != nil {
+		return nil, err
+	}
+	if opAddErr != nil {
+		return nil, opAddErr
+	}
+	return (*connStater)(atomic.LoadPointer(&fd.conn)), nil
+}
+
+type connStater struct {
+	fd    unsafe.Pointer // *fdOperator
+	state uint32
+}
+
+func (c *connStater) Close() error {
+	fd := (*fdOperator)(atomic.LoadPointer(&c.fd))
+	if fd != nil && atomic.CompareAndSwapPointer(&c.fd, unsafe.Pointer(fd), nil) {
+		atomic.StoreUint32(&c.state, uint32(StateClosed))
+		_ = poll.control(fd, opDel)
+		atomic.StorePointer(&fd.conn, nil)
+		pollcache.freeable(fd)
+	}
+	return nil
+}
+
+func (c *connStater) State() ConnState {
+	return ConnState(atomic.LoadUint32(&c.state))
+}
diff --git a/connstate/conn_test.go b/connstate/conn_test.go
new file mode 100644
index 0000000..15aae54
--- /dev/null
+++ b/connstate/conn_test.go
@@ -0,0 +1,349 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"errors"
+	"io"
+	"net"
+	"runtime"
+	"sync"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestListenConnState(t *testing.T) {
+	ln, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		panic(err)
+	}
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			assert.Nil(t, err)
+			go func(conn net.Conn) {
+				buf := make([]byte, 11)
+				_, err := conn.Read(buf)
+				assert.Nil(t, err)
+				conn.Close()
+			}(conn)
+		}
+	}()
+	conn, err := net.Dial("tcp", ln.Addr().String())
+	assert.Nil(t, err)
+	stater, err := ListenConnState(conn)
+	assert.Nil(t, err)
+	assert.Equal(t, StateOK, stater.State())
+	_, err = conn.Write([]byte("hello world"))
+	assert.Nil(t, err)
+	buf := make([]byte, 1)
+	_, err = conn.Read(buf)
+	assert.Equal(t, io.EOF, err)
+	time.Sleep(10 * time.Millisecond)
+	assert.Equal(t, StateRemoteClosed, stater.State())
+	assert.Nil(t, stater.Close())
+	assert.Nil(t, conn.Close())
+	assert.Equal(t, StateClosed, stater.State())
+}
+
+type mockPoller struct {
+	controlFunc func(fd *fdOperator, op op) error
+}
+
+func (m *mockPoller) wait() error {
+	return nil
+}
+
+func (m *mockPoller) control(fd *fdOperator, op op) error {
+	return m.controlFunc(fd, op)
+}
+
+type mockConn struct {
+	net.Conn
+	controlFunc func(f func(fd uintptr)) error
+}
+
+func (c *mockConn) SyscallConn() (syscall.RawConn, error) {
+	return &mockRawConn{
+		controlFunc: c.controlFunc,
+	}, nil
+}
+
+type mockRawConn struct {
+	syscall.RawConn
+	controlFunc func(f func(fd uintptr)) error
+}
+
+func (r *mockRawConn) Control(f func(fd uintptr)) error {
+	return r.controlFunc(f)
+}
+
+func TestListenConnState_Err(t *testing.T) {
+	// replace poll
+	pollInitOnce.Do(createPoller)
+	oldPoll := poll
+	defer func() {
+		poll = oldPoll
+	}()
+	// test detach
+	var expectDetach bool
+	defer func() {
+		assert.True(t, expectDetach)
+	}()
+	cases := []struct {
+		name            string
+		connControlFunc func(f func(fd uintptr)) error
+		pollControlFunc func(fd *fdOperator, op op) error
+		expectErr       error
+	}{
+		{
+			name: "err conn control",
+			connControlFunc: func(f func(fd uintptr)) error {
+				return errors.New("err conn control")
+			},
+			expectErr: errors.New("err conn control"),
+		},
+		{
+			name: "err poll control",
+			connControlFunc: func(f func(fd uintptr)) error {
+				f(1)
+				return nil
+			},
+			pollControlFunc: func(fd *fdOperator, op op) error {
+				assert.Equal(t, fd.fd, 1)
+				return errors.New("err poll control")
+			},
+			expectErr: errors.New("err poll control"),
+		},
+		{
+			name: "err conn control after poll add",
+			connControlFunc: func(f func(fd uintptr)) error {
+				f(1)
+				return errors.New("err conn control after poll add")
+			},
+			pollControlFunc: func(fd *fdOperator, op op) error {
+				if op == opDel {
+					expectDetach = true
+				}
+				assert.Equal(t, fd.fd, 1)
+				return nil
+			},
+			expectErr: errors.New("err conn control after poll add"),
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			poll = &mockPoller{
+				controlFunc: c.pollControlFunc,
+			}
+			conn := &mockConn{
+				controlFunc: c.connControlFunc,
+			}
+			_, err := ListenConnState(conn)
+			assert.Equal(t, c.expectErr, err)
+		})
+	}
+}
+
+func BenchmarkListenConnState(b *testing.B) {
+	ln, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		panic(err)
+	}
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			assert.Nil(b, err)
+			go func(conn net.Conn) {
+				buf := make([]byte, 11)
+				_, err := conn.Read(buf)
+				assert.Nil(b, err)
+				conn.Close()
+			}(conn)
+		}
+	}()
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			conn, err := net.Dial("tcp", ln.Addr().String())
+			assert.Nil(b, err)
+			stater, err := ListenConnState(conn)
+			assert.Nil(b, err)
+			assert.Equal(b, StateOK, stater.State())
+			_, err = conn.Write([]byte("hello world"))
+			assert.Nil(b, err)
+			buf := make([]byte, 1)
+			_, err = conn.Read(buf)
+			assert.Equal(b, io.EOF, err)
+			time.Sleep(10 * time.Millisecond)
+			assert.Equal(b, StateRemoteClosed, stater.State())
+			assert.Nil(b, stater.Close())
+			assert.Nil(b, conn.Close())
+			assert.Equal(b, StateClosed, stater.State())
+		}
+	})
+}
+
+type statefulConn struct {
+	net.Conn
+	stater ConnStater
+}
+
+func (s *statefulConn) Close() error {
+	s.stater.Close()
+	return s.Conn.Close()
+}
+
+type mockStater struct {
+}
+
+func (m *mockStater) State() ConnState {
+	return StateOK
+}
+
+func (m *mockStater) Close() error {
+	return nil
+}
+
+type connpool struct {
+	mu    sync.Mutex
+	conns []*statefulConn
+}
+
+func (p *connpool) get(dialFunc func() *statefulConn) *statefulConn {
+	p.mu.Lock()
+	if len(p.conns) == 0 {
+		p.mu.Unlock()
+		return dialFunc()
+	}
+	for i := len(p.conns) - 1; i >= 0; i-- {
+		conn := p.conns[i]
+		if conn.stater.State() == StateOK {
+			p.conns = p.conns[:i]
+			p.mu.Unlock()
+			return conn
+		} else {
+			conn.Close()
+		}
+	}
+	p.conns = p.conns[:0]
+	p.mu.Unlock()
+	return dialFunc()
+}
+
+func (p *connpool) put(conn *statefulConn) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.conns = append(p.conns, conn)
+}
+
+func (p *connpool) Close() error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for _, conn := range p.conns {
+		conn.Close()
+	}
+	p.conns = p.conns[:0]
+	return nil
+}
+
+var withListenConnState bool
+
+// BenchmarkWithConnState is used to verify the impact of adding ConnState logic on performance.
+// To compare with syscall.EpollWait(), you could run `go test -bench=BenchmarkWith -benchtime=10s .`
+// to test the first time, and replace isyscall.EpollWait() with syscall.EpollWait() to test the second time.
+func BenchmarkWithConnState(b *testing.B) {
+	withListenConnState = true
+	benchmarkConnState(b)
+}
+
+func BenchmarkWithoutConnState(b *testing.B) {
+	withListenConnState = false
+	benchmarkConnState(b)
+}
+
+func benchmarkConnState(b *testing.B) {
+	// set GOMAXPROCS to 1 to make P resources scarce
+	runtime.GOMAXPROCS(1)
+	ln, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		panic(err)
+	}
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			assert.Nil(b, err)
+			go func(conn net.Conn) {
+				var count uint64
+				for {
+					buf := make([]byte, 11)
+					_, err := conn.Read(buf)
+					if err != nil {
+						conn.Close()
+						return
+					}
+					_, err = conn.Write(buf)
+					if err != nil {
+						conn.Close()
+						return
+					}
+					count++
+					if count == 1000 {
+						conn.Close()
+						return
+					}
+				}
+			}(conn)
+		}
+	}()
+	cp := &connpool{}
+	dialFunc := func() *statefulConn {
+		conn, err := net.Dial("tcp", ln.Addr().String())
+		assert.Nil(b, err)
+		var stater ConnStater
+		if withListenConnState {
+			stater, err = ListenConnState(conn)
+			assert.Nil(b, err)
+		} else {
+			stater = &mockStater{}
+		}
+		return &statefulConn{
+			Conn:   conn,
+			stater: stater,
+		}
+	}
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			conn := cp.get(dialFunc)
+			buf := make([]byte, 11)
+			_, err := conn.Write(buf)
+			if err != nil {
+				conn.Close()
+				continue
+			}
+			_, err = conn.Read(buf)
+			if err != nil {
+				conn.Close()
+				continue
+			}
+			cp.put(conn)
+		}
+	})
+	_ = cp.Close()
+}
diff --git a/connstate/poll.go b/connstate/poll.go
new file mode 100644
index 0000000..f6c4264
--- /dev/null
+++ b/connstate/poll.go
@@ -0,0 +1,49 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"fmt"
+	"sync"
+)
+
+type op int
+
+const (
+	opAdd op = iota
+	opDel
+)
+
+var (
+	pollInitOnce sync.Once
+	poll         poller
+)
+
+type poller interface {
+	wait() error
+	control(fd *fdOperator, op op) error
+}
+
+func createPoller() {
+	var err error
+	poll, err = openpoll()
+	if err != nil {
+		panic(fmt.Sprintf("gopkg.connstate openpoll failed, err: %v", err))
+	}
+	go func() {
+		err := poll.wait()
+		fmt.Printf("gopkg.connstate epoll wait exit, err: %v\n", err)
+	}()
+}
diff --git a/connstate/poll_bsd.go b/connstate/poll_bsd.go
new file mode 100644
index 0000000..818e3e8
--- /dev/null
+++ b/connstate/poll_bsd.go
@@ -0,0 +1,91 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build darwin || netbsd || freebsd || openbsd || dragonfly
+// +build darwin netbsd freebsd openbsd dragonfly
+
+package connstate
+
+import (
+	"sync/atomic"
+	"syscall"
+	"unsafe"
+)
+
+type kqueue struct {
+	fd int
+}
+
+func (p *kqueue) wait() error {
+	events := make([]syscall.Kevent_t, 1024)
+	for {
+		n, err := syscall.Kevent(p.fd, nil, events, nil)
+		if err != nil && err != syscall.EINTR {
+			// exit gracefully
+			if err == syscall.EBADF {
+				return nil
+			}
+			return err
+		}
+		for i := 0; i < n; i++ {
+			ev := &events[i]
+			op := *(**fdOperator)(unsafe.Pointer(&ev.Udata))
+			if conn := (*connStater)(atomic.LoadPointer(&op.conn)); conn != nil {
+				if ev.Flags&(syscall.EV_EOF) != 0 {
+					atomic.CompareAndSwapUint32(&conn.state, uint32(StateOK), uint32(StateRemoteClosed))
+				}
+			}
+		}
+		// we can make sure that there is no op remaining if finished handling all events
+		pollcache.free()
+	}
+}
+
+func (p *kqueue) control(fd *fdOperator, op op) error {
+	evs := make([]syscall.Kevent_t, 1)
+	evs[0].Ident = uint64(fd.fd)
+	*(**fdOperator)(unsafe.Pointer(&evs[0].Udata)) = fd
+	if op == opAdd {
+		evs[0].Filter = syscall.EVFILT_READ
+		evs[0].Flags = syscall.EV_ADD | syscall.EV_ENABLE | syscall.EV_CLEAR
+		// prevent ordinary data from triggering
+		evs[0].Flags |= syscall.EV_OOBAND
+		evs[0].Fflags = syscall.NOTE_LOWAT
+		evs[0].Data = 0x7FFFFFFF
+		_, err := syscall.Kevent(p.fd, evs, nil, nil)
+		return err
+	} else {
+		evs[0].Filter = syscall.EVFILT_READ
+		evs[0].Flags = syscall.EV_DELETE
+		_, err := syscall.Kevent(p.fd, evs, nil, nil)
+		return err
+	}
+}
+
+func openpoll() (p poller, err error) {
+	fd, err := syscall.Kqueue()
+	if err != nil {
+		return nil, err
+	}
+	_, err = syscall.Kevent(fd, []syscall.Kevent_t{{
+		Ident:  0,
+		Filter: syscall.EVFILT_USER,
+		Flags:  syscall.EV_ADD | syscall.EV_CLEAR,
+	}}, nil, nil)
+	if err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+	return &kqueue{fd: fd}, nil
+}
diff --git a/connstate/poll_cache.go b/connstate/poll_cache.go
new file mode 100644
index 0000000..707413a
--- /dev/null
+++ b/connstate/poll_cache.go
@@ -0,0 +1,83 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"sync"
+	"unsafe"
+)
+
+const pollBlockSize = 4 * 1024
+
+type fdOperator struct {
+	link  *fdOperator // in pollcache, protected by pollcache.lock
+	index int32
+
+	fd   int
+	conn unsafe.Pointer // *connStater
+}
+
+var pollcache pollCache
+
+type pollCache struct {
+	lock  sync.Mutex
+	first *fdOperator
+	cache []*fdOperator
+	// freelist store the freeable operator
+	// to reduce GC pressure, we only store op index here
+	freelist []int32
+}
+
+func (c *pollCache) alloc() *fdOperator {
+	c.lock.Lock()
+	if c.first == nil {
+		const pdSize = unsafe.Sizeof(fdOperator{})
+		n := pollBlockSize / pdSize
+		if n == 0 {
+			n = 1
+		}
+		index := int32(len(c.cache))
+		for i := uintptr(0); i < n; i++ {
+			pd := &fdOperator{index: index}
+			c.cache = append(c.cache, pd)
+			pd.link = c.first
+			c.first = pd
+			index++
+		}
+	}
+	op := c.first
+	c.first = op.link
+	c.lock.Unlock()
+	return op
+}
+
+// freeable mark the operator that could be freed
+// only poller could do the real free action
+func (c *pollCache) freeable(op *fdOperator) {
+	c.lock.Lock()
+	c.freelist = append(c.freelist, op.index)
+	c.lock.Unlock()
+}
+
+func (c *pollCache) free() {
+	c.lock.Lock()
+	for _, idx := range c.freelist {
+		op := c.cache[idx]
+		op.link = c.first
+		c.first = op
+	}
+	c.freelist = c.freelist[:0]
+	c.lock.Unlock()
+}
diff --git a/connstate/poll_cache_test.go b/connstate/poll_cache_test.go
new file mode 100644
index 0000000..86b5707
--- /dev/null
+++ b/connstate/poll_cache_test.go
@@ -0,0 +1,34 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPollCache(t *testing.T) {
+	pollcache.free()
+	fd := pollcache.alloc()
+	pollcache.freeable(fd)
+	assert.Equal(t, 1, len(pollcache.freelist))
+	fd1 := pollcache.alloc()
+	assert.NotEqual(t, fd, fd1)
+	pollcache.free()
+	assert.Equal(t, 0, len(pollcache.freelist))
+	fd2 := pollcache.alloc()
+	assert.Equal(t, fd, fd2)
+}
diff --git a/connstate/poll_linux.go b/connstate/poll_linux.go
new file mode 100644
index 0000000..50ede74
--- /dev/null
+++ b/connstate/poll_linux.go
@@ -0,0 +1,74 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"sync/atomic"
+	"syscall"
+	"unsafe"
+
+	isyscall "github.com/cloudwego/gopkg/internal/syscall"
+)
+
+const _EPOLLET uint32 = 0x80000000
+
+type epoller struct {
+	epfd int
+}
+
+//go:nocheckptr
+func (p *epoller) wait() error {
+	events := make([]syscall.EpollEvent, 1024)
+	for {
+		// epoll wait is a blocking syscall, so we need to call entersyscallblock to handoff P,
+		// and let the P run other goroutines.
+		n, err := isyscall.EpollWait(p.epfd, events, -1)
+		if err != nil && err != syscall.EINTR {
+			return err
+		}
+		for i := 0; i < n; i++ {
+			ev := &events[i]
+			op := *(**fdOperator)(unsafe.Pointer(&ev.Fd))
+			if conn := (*connStater)(atomic.LoadPointer(&op.conn)); conn != nil {
+				if ev.Events&(syscall.EPOLLHUP|syscall.EPOLLRDHUP|syscall.EPOLLERR) != 0 {
+					atomic.CompareAndSwapUint32(&conn.state, uint32(StateOK), uint32(StateRemoteClosed))
+				}
+			}
+		}
+		// we can make sure that there is no op remaining if finished handling all events
+		pollcache.free()
+	}
+}
+
+func (p *epoller) control(fd *fdOperator, op op) error {
+	if op == opAdd {
+		var ev syscall.EpollEvent
+		*(**fdOperator)(unsafe.Pointer(&ev.Fd)) = fd
+		ev.Events = syscall.EPOLLHUP | syscall.EPOLLRDHUP | syscall.EPOLLERR | _EPOLLET
+		return syscall.EpollCtl(p.epfd, syscall.EPOLL_CTL_ADD, fd.fd, &ev)
+	} else {
+		var ev syscall.EpollEvent
+		return syscall.EpollCtl(p.epfd, syscall.EPOLL_CTL_DEL, fd.fd, &ev)
+	}
+}
+
+func openpoll() (p poller, err error) {
+	var epfd int
+	epfd, err = syscall.EpollCreate(1)
+	if err != nil {
+		return nil, err
+	}
+	return &epoller{epfd: epfd}, nil
+}
diff --git a/connstate/poll_windows.go b/connstate/poll_windows.go
new file mode 100644
index 0000000..ad9404d
--- /dev/null
+++ b/connstate/poll_windows.go
@@ -0,0 +1,35 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import "errors"
+
+var (
+	errNotSupportedForWindows = errors.New("connstate not supported for windows")
+)
+
+type mockWindowsPoller struct{}
+
+func (m *mockWindowsPoller) wait() error {
+	return nil
+}
+
+func (m *mockWindowsPoller) control(fd *fdOperator, op op) error {
+	return errNotSupportedForWindows
+}
+
+func openpoll() (p poller, err error) {
+	return &mockWindowsPoller{}, nil
+}
diff --git a/internal/syscall/sys_epoll_linux.go b/internal/syscall/sys_epoll_linux.go
new file mode 100644
index 0000000..190e42f
--- /dev/null
+++ b/internal/syscall/sys_epoll_linux.go
@@ -0,0 +1,43 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !arm64 && !loong64
+// +build !arm64,!loong64
+
+package netpoll
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _zero uintptr
+
+// EpollWait implements epoll_wait.
+func EpollWait(epfd int, events []syscall.EpollEvent, msec int) (n int, err error) {
+	var _p0 unsafe.Pointer
+	if len(events) > 0 {
+		_p0 = unsafe.Pointer(&events[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	entersyscallblock()
+	r0, _, e1 := syscall.RawSyscall6(syscall.SYS_EPOLL_WAIT, uintptr(epfd), uintptr(_p0), uintptr(len(events)), uintptr(msec), 0, 0)
+	exitsyscall()
+	n = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
diff --git a/internal/syscall/sys_epoll_linux_arm64_.go b/internal/syscall/sys_epoll_linux_arm64_.go
new file mode 100644
index 0000000..fe97e9a
--- /dev/null
+++ b/internal/syscall/sys_epoll_linux_arm64_.go
@@ -0,0 +1,44 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build linux && (arm64 || loong64)
+// +build linux
+// +build arm64 loong64
+
+package netpoll
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _zero uintptr
+
+// EpollWait implements epoll_wait.
+func EpollWait(epfd int, events []syscall.EpollEvent, msec int) (n int, err error) {
+	var _p0 unsafe.Pointer
+	if len(events) > 0 {
+		_p0 = unsafe.Pointer(&events[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	entersyscallblock()
+	r0, _, e1 := syscall.RawSyscall6(syscall.SYS_EPOLL_PWAIT, uintptr(epfd), uintptr(_p0), uintptr(len(events)), uintptr(msec), 0, 0)
+	exitsyscall()
+	n = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
diff --git a/internal/syscall/unsafe.go b/internal/syscall/unsafe.go
new file mode 100644
index 0000000..46ba7cc
--- /dev/null
+++ b/internal/syscall/unsafe.go
@@ -0,0 +1,23 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package netpoll
+
+import _ "unsafe"
+
+//go:linkname entersyscallblock runtime.entersyscallblock
+func entersyscallblock()
+
+//go:linkname exitsyscall runtime.exitsyscall
+func exitsyscall()