[MiNT] Bug located, not in pppd

[Jim DeClercq <jimd@panix.com>]

The bug I have in mind had about the same frequency as the old 
Phantom Typist bug, and a typical one of these fatal errors was:

(AESSSYS): tcp_sndsig: seg: (1092741134 1092741135) outside wnd 
(1092741134 1092741134)

The numbers and apparent source process differed, but always involved
a one-unit seg not making it through a window with no opening.

Of course, the test strings involved are in the object code, when 
viewed with a binary editor.

So, I looked through MiNT kernel, N_AES, pppd, telnet, bash, and toswin, 
and found nothing. So I started in at other things, ext2.xfs, 
flop_raw.xdd, mfp.xdd, moose.xdd, scc.xdd, and sockdev.xdd, and finally 
found it. tcp_sndseg: seg: (%ld %ld) outside wnd (%ld %ld)

So, it is or was a spurious error from sockdev.xdd being reported as a 
fatal error from a variety of sources by a MiNT kernel.  It was not, 
as the documentation suggests, a too-small stack problem.

I finally realized that I may have been greatly in error about 1.16.0
not running pppd. When looking for a version of sockdev.xdd with a 
different date or size, I came across a text file for slip, saying that 
was what provided pppd support in 1.16.0. Easier to install? Nope. Moved
slip to where it should have been, and may try 1.16.0 again. But still it 
can't be made to work with a .rc init file that works with 1.15. Or at 
least it didn't when I tried it, since it failed to start syslogd.

I have no reason to believe that any changes were made to the coding 
for sockdev.xdd when moving it to some other file, so that bug is 
probably still there, but harder to find, and bothers only those who 
do a lot of typing, just as the old Phantom Typist bug, which lived in the 
keyboard handler bothered only certain people.

Source code must be available, so eventually I will find out what 
that tcp_sndseg error is supposed to catch.

Jim

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