K 10
svn:author
V 5
brian
K 8
svn:date
V 27
1999-01-10T01:26:30.000000Z
K 7
svn:log
V 333
Only call isatty() when we open our descriptor, and remember
the answer.

If we later get a descriptor exception from select(), we know
that it's a tty (isatty() returns 0 after the exception on a
tty) and remember to call modem_LogicalClose().

The upshot of it all is that descriptor exceptions dont leave
the tty locked any more.

END