Direct IO Functions

• dio_close — Closes the file descriptor given by fd
• dio_fcntl — Performs a c library fcntl on fd
• dio_open — Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow.
• dio_read — Reads bytes from a file descriptor
• dio_seek — Seeks to pos on fd from whence
• dio_stat — Gets stat information about the file descriptor fd
• dio_tcsetattr — Sets terminal attributes and baud rate for a serial port
• dio_truncate — Truncates file descriptor fd to offset bytes
• dio_write — Writes data to fd with optional truncation at length