AddShutdownListener adds fn as a shutdown listener.

AddWrapUpListener adds fn as a wrap up listener.

Done returns the channel that notifies the process quitting.

Env returns the value of the given environment variable.

EnvInt returns an int value of the given environment variable.

Pid returns pid of current process.

ProcessName returns the processname, same as the command name.

SetTimeToForceQuit sets the waiting time before force quitting.

Shutdown calls the registered shutdown listeners, only for test purpose.

StartProfile starts a new profiling session.

WrapUp wraps up the process, only for test purpose.

DefaultMemProfileRate is the default memory profiling rate.

Profile represents an active profiling session.