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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: no message or dialog when a DLL is missing
Date: Wed, 30 Aug 2006 16:29:57 +0100
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On 30 August 2006 16:19, Pierre Baillargeon wrote:

> I've identified the reason why DLL don't show up: in the startup code
> (winsup/cygwin/dcrt0.cc), in dll_crt0_0(), Win32's SetErrorMode() is
> called to suppress all OS error dialogs. It's there since 1998 according
> to the changelog, so it must not bother many people... 

  It's a real, huge, massive problem, when an entirely scripted and automated
process such as a cron job suddenly pops up a requester in the middle of the
night that won't go away until someone comes in the next day, logs in, and
clicks it away ...

> I guess it would
> be ugly to add error messages for missing DLLs all the way up from the
> low-level spawn/exec/etc.
> 
> And in it's usual nice design practice, SetErrorMode() is a global
> setting affecting all threads in the process, so changing it temporarily
> in the spawn()/exec() function could be bad.

  Probably, the solution would be for cygwin to spot the error and report it
through errno with a status of -2 from the exec call, so that the shell would
issue a 'file not found' error.  Or there might be some grounds to consider
adding a '(no)suppresspopups' option to the CYGWIN environment variable.

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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