More work on porting ssh kitten

tools/tty/tty.go

@@ -263,13 +263,19 @@ func (self *Term) ReadWithTimeout(b []byte, d time.Duration) (n int, err error)
 	}
 	num_ready, err := pselect()
 	if err != nil {
-		return
+		return 0, err
 	}
 	if num_ready == 0 {
 		err = os.ErrDeadlineExceeded
-		return
+		return 0, err
+	}
+	for {
+		n, err = self.Read(b)
+		if errors.Is(err, unix.EINTR) {
+			continue
+		}
+		return n, err
 	}
-	return self.Read(b)
 }
 
 func (self *Term) Read(b []byte) (int, error) {
@@ -280,10 +286,14 @@ func (self *Term) Write(b []byte) (int, error) {
 	return self.os_file.Write(b)
 }
 
+func is_temporary_error(err error) bool {
+	return errors.Is(err, unix.EINTR) || errors.Is(err, unix.EAGAIN) || errors.Is(err, unix.EWOULDBLOCK) || errors.Is(err, io.ErrShortWrite)
+}
+
 func (self *Term) WriteAll(b []byte) error {
 	for len(b) > 0 {
 		n, err := self.os_file.Write(b)
-		if err != nil && !errors.Is(err, io.ErrShortWrite) {
+		if err != nil && !is_temporary_error(err) {
 			return err
 		}
 		b = b[n:]
@@ -291,6 +301,10 @@ func (self *Term) WriteAll(b []byte) error {
 	return nil
 }
 
+func (self *Term) WriteAllString(s string) error {
+	return self.WriteAll(utils.UnsafeStringToBytes(s))
+}
+
 func (self *Term) WriteString(b string) (int, error) {
 	return self.os_file.WriteString(b)
 }