2007-05-08 Martin Hunt <hunt@redhat.com>

2007-05-08  Martin Hunt  <hunt@redhat.com>

	Signal handler cleanup.
	* mainloop.c (fatal_handler): New. Cleanly handle
	unexpected fatal signals.
	(setup_main_signals): New. Set signals once mainloop
	is entered.
	(setup_signals): New. Block certain signals during initialization.
	Set handler for fatal signals.
	* relay.c (reader_thread): Use ppoll(). Terminate on
	SIGUSR2 after reading any remaining data.
	(close_relayfs): Remove sleep hack. Send SIGUSR2 to all threads.

	Runtime debug messages.
	* staprun.h: Change dbug() to accept a debuglevel and
	enable it.
	* *.c: Modify dbug() calls.