doubly_linked_list.c: example of a dobly linked list.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
system_v_pipe.c: pipe implementation with poll system call waiting

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
enter_integer.cpp: cpp introduction

Signed-off-by: Philip Avinash <avinashphilip@ti.com>