Newsgroups: comp.os.minix
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!smurf!flatlin!ptavv!ralf
From: ralf@ptavv.ka.sub.org (Ralf Wenk)
Subject: Re: MacMinix / UUCP Help Please
Message-ID: <1991Jun1.233626.02516@ptavv.ka.sub.org>
Date: Sat, 1 Jun 1991 23:36:26 GMT
References: <1991May21.120721.19016@ukpoit.co.uk> <1991May22.200116.00948@ptavv.ka.sub.org>
Lines: 34

In article <1991May21.120721.19016@ukpoit.co.uk> paul@ukpoit.co.uk
(Paul Wood) writes:
> My main problems are with uucico. The protocol gets hung while retrying
> after a failure ("RJ out of window" message). I can transfer very small
> files, but anything above half-a-dozen lines of text invariably causes
> a problem.
> 
> I desperately need to contact other MacMinix/UUCP users who are trying
> to do the same as me. Has anybody succeeded?

It looks like I have a fix for this problem. The 'g' protocol description
says that the packet number in the reject message is the number of the
last correctly received packet. The MINIX uucico thinks it is the number
of the rejected packet. So the between()-test looks right but fails in
reality. E.g. uucico gets an ACK for packet 3, increments the "1st packet
in output window" counter to 4 and now gets a reject with contains the
number 3. With a window size of 3 between(4,3,7) will fail.

The fix is simple because the MINIX uucico uses the "number of the
rejected package" for retransmission.

 
*** uucico.c.old	Sun Jun  1 22:57:10 1991
--- uucico.c	Sat Jun  2 00:05:40 1991
***************
*** 1968,1969 ****
--- 1968,1970 ----
  				printmsg(M_MEDPROTO, "got RJ yyy=%d", yyy);
+ 				yyy = ( yyy + 1 ) & 7;	/* resend packet # */
  				if (between(send,yyy,next)) {

-- 
-- 
Ralf Wenk -- ralf@ptavv.ka.sub.org