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Subject: Re: [patch] fix empty environment handling
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Date: Mon, 19 Aug 2019 00:20:53 +0300
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18.08.2019 23:50, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via 
djgpp AT delorie DOT com] пишет:
> OFYI, I have tried the following OS of Microsoft all installed on 
> virtual machines
> with the following result:
>
>     OS     |  Loaded with SHELL= in config.sys  |  Calling 
> comcom32.exe from cmd line
>            |  or using PIF file                 |  of the running shell
> -----------+------------------------------------+-------------------------------------- 
>
> MSDOS 6.22 | Load error: no environment segment |
> MSDOS 7.10 |                                    |
> Win98SE    |                                    |
> Win2K SP5  |                                    |
> WinXP SP3  |                                    |
>
>
>
> The table shows the tested OS and the results.  The second column 
> shows the result
> for the case that comcom33.exe is loaded by the SHELL directive. The 
> third column
> shows the results for the case that comcom32.exe started from the 
> command line of
> the running shell usually COMMAND.COM or CMD.EXE.  Empty entries mean 
> that nothing
> has been printed by comcom32.exe.

You mean really nothing, even not a command prompt?
That would be strange, but otherwise perhaps DOSes
above 6.22 got that bug fixed. As for Windows - it definitely
wouldn't have an empty env, so on windows I don't suppose
this problem can be reproduced. Its only about plain DOSes
(but in your case plain 7.10 doesn't show any problem too).


>   For the Windows versions the second column means
> that a PIF file has been created to start comcom32.exe.  The table 
> shows that
> apparently only MSDOS 6.22 has an issue.
>
> If I try to start an DJGPP application from comcom32 that has been 
> started by a PIF
> file I get a crash like this:
>
> ENV buffer overflow (size 208)
> Exiting due to signal SIGSEGV 
The SIGSEGV is a problem of a test version - I
built it specially for various env testings and the
env overrun check is omitted. But I think you
can work around that problem if you run it with
/E:2048
to give more environment space. Then I hope
it will work. But as you said, its not related to
the problem, so maybe you don't want to do that. :)