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Path: utzoo!watmath!clyde!cbosgd!ihnp4!inuxc!pur-ee!uiucdcs!uiucuxc!fthood!egray
From: egray@fthood
Newsgroups: net.unix-wizards
Subject: Re: \"UC.C\" command problem
Message-ID: <1700003@fthood>
Date: Fri, 31-Jan-86 09:30:00 EST
Article-I.D.: fthood.1700003
Posted: Fri Jan 31 09:30:00 1986
Date-Received: Wed, 5-Feb-86 04:57:17 EST
References: <2023@brl-tgr.ARPA>
Lines: 34
Nf-ID: #R:brl-tgr.ARPA:2023:fthood:1700003:000:1574
Nf-From: fthood!egray    Jan 31 08:30:00 1986


> We have recently installed the "uc" command on a VAX 11/780 running
> BRL VAX UNIX.  We have encountered several tranmission errors. When
> trying to send a file it hangs up always on the 18th block. When
> trying to receive a file, it does not appear to start. 
> ... 
> Thank you
> Laurie

I have never heard of the 'uc' command and don't even know what it is...
But becuase of your excellent observations, I know what the problem is!

The transmission block numbers are being sent allong with each block of
data.  These would probably start at 1 (or perhaps 0) and increase as
the blocks are sent.  After the 18th block is sent, character 19 is sent
as the block number.  This character is the XOFF character that would
instruct the listener to wait until a XON character is sent.

This is more than likely what is happening...  Now, to solve the problem:

Find the part of the code that resets the communication line.  This would
either be a 'ioctl' call or a 'setty' call.  Change the communication
protocol to the 'raw' mode (the mode that ignores XOFF and XON).  There are
several ways of doing this depending on which flavor of unix you are using.
You will find a write-up in the manual sections tty(4) or termio(7) depending
again on the flavor of unix.

PS: If you have a uucp address, indicate it in your note.  That way other
uucp domain sites can respond directly to you by mail.

Emmet P. Gray				US Army, HQ III Corps & Ft. Hood
..!ihnp4!uiucdcs!uiucuxc!fthood!egray	Attn: AFZF-DE-EMO
					DEH, Environmental Management Office
					Fort Hood, TX 76544-5057