103     pub fn input(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in input()
105         let val = self.write_stdin(buf, block)?;  in input()
120     pub fn output(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in output()
121         return self.read_output(buf, block);  in output()
131     pub fn stdout(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in stdout()
132         return self.write_output(buf, block);  in stdout()
142     pub fn stderr(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in stderr()
143         return self.write_output(buf, block);  in stderr()
153     pub fn read_stdin(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in read_stdin()
162                         if block {  in read_stdin()
187     fn write_stdin(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in write_stdin()
195                         if block {  in write_stdin()
219     fn read_output(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in read_output()
227                         if block {  in read_output()
252     fn write_output(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in write_output()
260                         if block {  in write_output()