TCPS-910 — Log level incremented in response to a received signal
The log level (maximum severity code which will be logged) can be set between I (6, LOG_INFO) to F (9, FULL_DEBUG). To increment log level in all processes of the proxy, SIGUSR1 should be sent to the parent process. It then asks all children to also increment the log level by sending them SIGHUP. The parent can send several commands to the children using SIGHUP. The particular command is determined by a value set in shared memory.