[add] 10.12.1.c 10.7.0.c 10.7.2.c 10.9.2.c.
[modify] 10.7.1.c 10.7.3.c 10.7.4.c Advanced_programming_in_the_Unix_Environment.pdf.

Signed-off-by: Cedar Li <china.cedar.li@gmail.com>