Multiple processes will use one hash table to maintain the global states

a global cannot work after fork

maybe you can use key-value db such as Redis, it is easy

but when I use it in Mininet host , it cannot work bcs the Namespace

So, I use a worker process to maintain the hash table, others processes send command to it.

Yes, it turns to be a simple local key-value store server.

• IPC use FIFO pipe
• the protocol is a line(pid + cmd_str + key + value) for simple
• hash table I use jwHashTable

A strong protocol to support more messages.

use example see server.c, (client02.c