105     pub fn input(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in input()
107         let val = self.write_stdin(buf, block)?;  in input()
122     pub fn output(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in output()
123         return self.read_output(buf, block);  in output()
133     pub fn stdout(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in stdout()
134         return self.write_output(buf, block);  in stdout()
144     pub fn stderr(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in stderr()
145         return self.write_output(buf, block);  in stderr()
155     pub fn read_stdin(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in read_stdin()
164                         if block {  in read_stdin()
199     fn write_stdin(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in write_stdin()
207                         if block {  in write_stdin()
231     fn read_output(&self, buf: &mut [u8], block: bool) -> Result<usize, TtyError> {  in read_output()
239                         if block {  in read_output()
264     fn write_output(&self, buf: &[u8], block: bool) -> Result<usize, TtyError> {  in write_output()
272                         if block {  in write_output()