improved under linux serial debugging a small assistant, using poll mechanism

sct-complete\.deps\main.Po
............\.....\sct.Po
............\.....\tio.Po
............\.....\util.Po
............\ChangeLog
............\cmd.c
............\cmd.h
............\cmd.o
............\COPYING
............\log.dat
............\main.c
............\main.o
............\Makefile
............\mk_linux
............\mk_sco
............\README
............\sct
............\sct.c
............\sct.h
............\sct.o
............\stdhdr.h
............\tio.c
............\tio.h
............\tio.o
............\util.c
............\util.h
............\util.o
............\.deps
sct-complete

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