diff --git a/syscall/io_test.go b/syscall/io_test.go
index c22e688..b67ee5c 100644
--- a/syscall/io_test.go
+++ b/syscall/io_test.go
@@ -1,16 +1,166 @@
 package syscall
 
 import (
+	"bytes"
+	"fmt"
+	"os"
 	"syscall"
 	"testing"
-	"unsafe"
+	"time"
+
+	"github.com/ii64/gouring"
+	"github.com/ii64/gouring/queue"
+	"github.com/stretchr/testify/assert"
 )
 
-func TestAccept(t *testing.T) {
+func initRing(t *testing.T) (ring *gouring.Ring, q *queue.Queue, cq chan *gouring.CQEntry) {
+	ring, err := gouring.New(128, nil)
+	if err != nil {
+		panic(err)
+	}
+	q = queue.New(ring)
 
-	var raw syscall.RawSockaddrAny
+	cq = make(chan *gouring.CQEntry)
 
-	t.Logf("%d\n", unsafe.Sizeof(raw))
+	go q.RunPoll(true, 1, func(cqe *gouring.CQEntry) (err error) {
+		fmt.Printf("got cqe: %+#v\n", cqe)
+		cq <- cqe
+		return nil
+	})
 
-	t.Fail()
+	go func() {
+		<-time.After(5 * time.Second)
+		t.Logf("timeout")
+		t.Fail()
+	}()
+	return
+}
+
+// func TestAccept(t *testing.T) {
+// 	sqe := q.GetSQEntry()
+// }
+
+func TestRead(t *testing.T) {
+	ring, q, cq := initRing(t)
+	defer q.Close()
+	defer ring.Close()
+
+	var f *os.File
+	var err error
+	f, err = os.Open("/dev/urandom")
+	assert.NoError(t, err, "urandom")
+	fd := f.Fd()
+	defer f.Close()
+
+	b := make([]byte, 25)
+	ud := uint64(gouring.IORING_OP_READ)
+	sqe := q.GetSQEntry()
+	Read(sqe, int(fd), b)
+	sqe.UserData = ud
+
+	ret, err := q.Submit()
+	assert.NoError(t, err)
+	assert.Equal(t, 1, ret, "mismatch submit return value")
+
+	cqe := <-cq
+	assert.Equal(t, ud, cqe.UserData)
+	assert.Equal(t, len(b), int(cqe.Res))
+}
+
+func TestReadv(t *testing.T) {
+	ring, q, cq := initRing(t)
+	defer q.Close()
+	defer ring.Close()
+
+	var f *os.File
+	var err error
+	f, err = os.Open("/dev/urandom")
+	assert.NoError(t, err, "urandom")
+	fd := f.Fd()
+	defer f.Close()
+
+	bs := [][]byte{}
+	bN := 25
+	iovs := []syscall.Iovec{}
+	iovN := 5
+	for i := 0; i < iovN; i++ {
+		b := make([]byte, bN)
+		bs = append(bs, b)
+		iovs = append(iovs, syscall.Iovec{
+			Base: &b[0],
+			Len:  uint64(len(b)),
+		})
+	}
+
+	ud := uint64(gouring.IORING_OP_READV)
+	sqe := q.GetSQEntry()
+	Readv(sqe, int(fd), iovs)
+	sqe.UserData = ud
+
+	ret, err := q.Submit()
+	assert.NoError(t, err)
+	assert.Equal(t, 1, ret, "mismatch submit return value")
+
+	cqe := <-cq
+	assert.Equal(t, ud, cqe.UserData)
+	assert.Equal(t, bN*iovN, int(cqe.Res))
+
+	eb := make([]byte, bN)
+	for i := 0; i < iovN; i++ {
+		if bytes.Compare(bs[i], eb) == 0 {
+			assert.NotEqual(t, eb, bs[i], "read urandom")
+		}
+	}
+}
+
+func TestWrite(t *testing.T) {
+	ring, q, cq := initRing(t)
+	defer q.Close()
+	defer ring.Close()
+
+	wr := "hello"
+	ud := uint64(gouring.IORING_OP_WRITE)
+	sqe := q.GetSQEntry()
+	Write(sqe, syscall.Stdout, []byte(wr))
+	sqe.UserData = ud
+
+	ret, err := q.Submit()
+	assert.NoError(t, err)
+	assert.Equal(t, 1, ret, "mismatch submit return value")
+
+	cqe := <-cq
+	assert.Equal(t, ud, cqe.UserData)
+	assert.Equal(t, len(wr), int(cqe.Res))
+}
+
+func TestWritev(t *testing.T) {
+	ring, q, cq := initRing(t)
+	defer q.Close()
+	defer ring.Close()
+
+	wr := "hello\n"
+	bs := [][]byte{}
+	iovs := []syscall.Iovec{}
+	iovN := 5
+	for i := 0; i < iovN; i++ {
+		b := []byte(wr)
+		bs = append(bs, b)
+		iovs = append(iovs, syscall.Iovec{
+			Base: &b[0],
+			Len:  uint64(len(b)),
+		})
+	}
+
+	ud := uint64(gouring.IORING_OP_WRITEV)
+	sqe := q.GetSQEntry()
+	Writev(sqe, syscall.Stdout, iovs)
+	sqe.UserData = ud
+
+	ret, err := q.Submit()
+	assert.NoError(t, err)
+	assert.Equal(t, 1, ret, "mismatch submit retrun value")
+
+	cqe := <-cq
+	assert.Equal(t, ud, cqe.UserData)
+	assert.Equal(t, len(wr)*iovN, int(cqe.Res))
 }