Transplant isc dhcp4.4.1, need to modify the function to the DHCP server can real-time found configuration file changes and to make effective, probably thinking, add threads, monitoring configuration file, the modified call isc DHCP readconf and discoverinterfaces function, make effective, encountered in the implementation, IO preliminary registration problem solving and new configuration of IP address pool allocation is less than, want to do and familiar with source and guidance, or have other implementation approach, thank you very much