MTWEOF
{ "weof", MTWEOF, O_RDWR, 1 },
{ "eof", MTWEOF, O_RDWR, 1 },
tapeop.mt_op = MTWEOF;
if (tapeop.mt_op == MTWEOF)
op.mt_op = MTWEOF;
case MTWEOF:
case MTWEOF: