I read the unbound remote control code, I know that unbound use pipe in the
remote control logic.However, I am confused, I summary the steps as follows.
Firstly,Unbound add pipe read side into I/O event list,so if the pipe has data,
the select (epoll_wait) function return, andexecute the callback function.
Secondly,unbound receive user command,such as unbound-control stub_add ***,and
then the main thread first write the command type such as "worker_cmd_remote"
into all pipe write side via function worker_send_cmd,and then call
functiontube_write_msg write the command string to the pipe.
Thirdly,because pipe has data to read,so the event callback function would be
executed,and read the command type such as "worker_cmd_remote" from the pipe,
and then call function tube_read_msg to read the command string,and then call
function execute_cmd to exucte the command.
So my question is that why unbound distinguish between the command type &
command string,I think we can send the command string to the child thread
directly,and do not need send the command type firstly.
------------------
Best wishes for youFrom Sure Ning
Mail:[email protected]
Address:Beijing China（中国 北京）
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