
1. defunct process  issue.
	=>child thread didn't correctly collected by parent thread.

	[root@shiang wsc_upnp]# ps -aux | grep wscd
	Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.5/FAQ
	root     17172  0.0  0.0      0     0 pts/2    Zl+  16:53   0:00 [wscd] <defunct>
	root     19452  0.0  0.2   3756   700 pts/1    S+   20:28   0:00 grep wscd

	
2.

