diff --git a/operation.go b/operation.go
index 503c624..83d48a1 100644
--- a/operation.go
+++ b/operation.go
@@ -84,6 +84,13 @@ func (o *Operation) ioloop() {
 		keepInSearchMode := false
 		keepInCompleteMode := false
 		r := o.t.ReadRune()
+		if r == 0 { // io.EOF
+			o.buf.Clean()
+			select {
+			case o.errchan <- io.EOF:
+			}
+			break
+		}
 		isUpdateHistory := true
 
 		if o.IsInCompleteSelectMode() {
diff --git a/terminal.go b/terminal.go
index 4e17227..71a72f6 100644
--- a/terminal.go
+++ b/terminal.go
@@ -67,8 +67,13 @@ func (t *Terminal) Readline() *Operation {
 	return NewOperation(t, t.cfg)
 }
 
+// return rune(0) if meet EOF
 func (t *Terminal) ReadRune() rune {
-	return <-t.outchan
+	ch, ok := <-t.outchan
+	if !ok {
+		return rune(0)
+	}
+	return ch
 }
 
 func (t *Terminal) IsReading() bool {
@@ -136,6 +141,7 @@ func (t *Terminal) ioloop() {
 			t.outchan <- r
 		}
 	}
+	close(t.outchan)
 }
 
 func (t *Terminal) Bell() {
diff --git a/utils.go b/utils.go
index 18e659a..386bcba 100644
--- a/utils.go
+++ b/utils.go
@@ -10,6 +10,7 @@ import (
 
 var (
 	StdinFd   = int(uintptr(syscall.Stdin))
+	StdoutFd  = int(uintptr(syscall.Stdout))
 	isWindows = false
 )
 
diff --git a/utils_unix.go b/utils_unix.go
index 0937b28..7a40cff 100644
--- a/utils_unix.go
+++ b/utils_unix.go
@@ -18,7 +18,7 @@ type winsize struct {
 func getWidth() int {
 	ws := &winsize{}
 	retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
-		uintptr(StdinFd),
+		uintptr(StdoutFd),
 		uintptr(syscall.TIOCGWINSZ),
 		uintptr(unsafe.Pointer(ws)))