NewDefault sets up a signal handler If no signals are given in the argument list, the default set of INT, TERM, HUP.

NewHandler sets up a signal handler If no signals are given in the argument list, the default set of INT, TERM, HUP.

NewUsr sets up a signal handler If no signals are given in the argument list, the default set of INT, TERM, HUP.

DefaultSignals INT, TERM, HUP.

PipeHandlerSignals includes watching for QUIT, PIPE and STOP.

UsrSignals INT, TERM, HUP.

Handler watch and manage signals.