text: #ifndef IO_H
  #define IO_H
  
  #include <fcntl.h>
  #include <stdio.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <unistd.h>
  
  int create_pipe_streams(FILE *pipe_streams[]);
  
  int redirect_input_stream(const char *input_filename, int input_stream_fileno);
  
  int redirect_output_stream(int output_stream_fileno, const char *output_filename);
  
  #endif
  