PC client multi-process tong network letter module
workflow is as follows:
a) Create Socket
b) Bind Socket
c) Connect three Socket handles
d) Use fork() to create two child processes and two
child processes dormancy
e) Cycle the Select surveillance PC control interface
edge Socket handle and the development of flat in the Socket
f) Wait for PC interface control connected and
development flat, if it has no information, it will repeat
recursive reach out a operation, the Select teats circulation
monitor˗
g) If it receives the corresponding information, then
carries on the corresponding reading and writing operation,