GetProcessFromFile reads the pidfile and returns the running process or error if the process or file are not available.

NewWatcher creates a Watcher.

WithLogger adds a logger to the Watcher.

WithPIDFile specifies the pid file to use.

Watcher watches a process for a graceful restart preserving open network sockets to avoid packet loss.

Server is the interface that servers like HTTP or gRPC servers need to implement.

Option represent an option.