XXIII. Direct IO functions

Table of Contents
dio_open --  Opens a new filename with specified permissions of flags and creation permissions of mode
dio_read --  Reads n bytes from fd and returns them, if n is not specified, reads 1k block
dio_write --  Writes data to fd with optional truncation at length
dio_truncate --  Truncates file descriptor fd to offset bytes
dio_stat --  Gets stat information about the file descriptor fd
dio_seek -- Seeks to pos on fd from whence
dio_fcntl -- Performs a c library fcntl on fd
dio_close -- Closes the file descriptor given by fd