Direct IO

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