Path: utzoo!attcan!uunet!ncrlnk!ncrwat!del From: del@ncrwat.Waterloo.NCR.COM (Douglas E. Lamb) Newsgroups: comp.sys.ncr Subject: Re: ttyb weirdness Message-ID: <263@ncrwat.Waterloo.NCR.COM> Date: 2 Feb 90 15:18:41 GMT References: <272@psgdc> Organization: NCR Canada Ltd, Waterloo, Ontario, Canada. Lines: 28 In article <272@psgdc>, rg@psgdc (Dick Gill) writes: = The ttyb terminal was at a login, and I entered = my login name. After hitting a , the cursor moved down = a line and to the left, but did not ask for a password. Another = got me the password prompt and I entered the password, = again followed by a . Once again the cursor moved to = the left and down a line but the system did not respond. After = another the system responded that the login was = invalid and asked for a login again. Several additional tries = gave me the same result. This sounds like that there's another process talking to the tty. When more than one process is attempting to read data from the same tty, keyboard data is given to each process in turn, line by line. The first line to process 1, the second to process 2, etc. In this case, the login process appears to be getting every other line, indicating one other process in the loop. This can be verified by doing a '/etc/fuser -u /dev/ttyb'. This will return all processes that have ttyb open for I/O. Beware, however, certain daemons like 'errdemon' and 'lpsched' tend to have the 'console' open for output. So look for a process that wouldn't normally be doing I/O to the console. -- Douglas E. Lamb, Tower/WIN Administrator ---- Doug ---- Information Systems and Services MAILplus: D.Lamb@Waterloo.NCR.COM E & M Waterloo UUCP: uunet!ncrlnk!ncrwat!del Waterloo, Ontario, CANADA VOICEplus: 643-1319 (519-884-1710)