teepty.py 文件源码

def _copy(self):
        """Main select loop. Passes all data to self.master_read() or self.stdin_read().
        """
        assert self.master_fd is not None
        master_fd = self.master_fd
        bufsize = self.bufsize
        while True:
            try:
                rfds, wfds, xfds = select.select([master_fd, pty.STDIN_FILENO], [], [])
            except OSError as e:
                if e.errno == 4:  # Interrupted system call. 
                    continue      # This happens at terminal resize.
            if master_fd in rfds:
                data = os.read(master_fd, bufsize)
                self.write_stdout(data)
            if pty.STDIN_FILENO in rfds:
                data = os.read(pty.STDIN_FILENO, bufsize)
                self.write_stdin(data)