Okay, in that case use gdb instead, like this:
gdb /usr/lib/cups/backend/serial {pid}
(gdb) bt
OK. (assuming you mean to find out what it's doing after it should have died)
-- [neil@xxx ~]# rm -f .signature [neil@xxx ~]# ls -l .signature ls: .signature: No such file or directory [neil@xxx ~]# exit
