[Tcl-bugs] [ tktoolkit-Bugs-232731 ] exec grabs stdin -- wish8x.exe on Win9x only

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Bugs item #232731, was opened at 02/16/01 10:52
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Category: 54. [console]
Group: None
>Status: Closed
Resolution: Out of Date
Priority: 6
Submitted By: Brian H. Toby (briantoby)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: exec grabs stdin -- wish8x.exe on Win9x only

Initial Comment:
Problem summary:
  The exec command can be used to run a command in a shell [console] window on every platform except Win-95/98 (-ME?).  On Unix this is done with 
	exec xterm -e /bin/sh -c ...
on Win-NT this is done with 
	exec $env(COMSPEC) /c "start ..."
On Win-95/98 (I have not tried -ME) if one tries this, the DOS window the keyboard is not connected to stdin. This is not a Windows limitation, but rather a problem in wish (I have tested 8.0.3, 8.2.3 and 8.4a2).

Example: 
  create a batch file, C:\test\test.bat, that contains three commands:
 
       PAUSE
       DIR
       PAUSE
 
try to run this file from wish8x.exe using (for example)
	exec start {c:\test\test.bat} &
the DOS box is created and you see the prompt "Press any key to continue..." but the window is hung. Note this does work from tclsh.exe.

Details:
  This appears to be a problem with the exec command rather than an inherent limitation in Windows, because it is possible to achieve the correct result using the WINEXEC package (http://www.du.edu/~mschwart/tclextensions.html#WinexecTbl). The winexec command uses a direct call to CreateProcess 
	result = CreateProcess (argv[1],  0,  0, 0, 0, DETACHED_PROCESS, 0, 
		options.dirnameptr,  &si, &pi);
so the problem must be related to all of the extra stuff that the exec command does.

It would be good to have this limitation eliminated from wish on the Win-9x platform, rather than require use of a binary package and a non-standard command to achieve equivalence with wish on Unix and Win-NT.

Brian

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>Comment By: SourceForge Robot (sf-robot)
Date: 06/09/06 19:20

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This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).

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Comment By: Jeffrey Hobbs (hobbs)
Date: 03/16/04 15:20

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Yes, it's a Win9x only issue.

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Comment By: Don Porter (dgp)
Date: 03/16/04 15:13

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Any news on this idle report?  Is it only valid
on Win 98, and thus, on its way to becoming
"Out of Date" ?

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Comment By: Jeffrey Hobbs (hobbs)
Date: 10/22/01 12:14

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Confirmed on Win98 and WinME for 8.3.4.  David Gravereaux 
had some ideas in a recent comp.lang.tcl thread that may 
apply to this (not getting them in google right now 
though...)

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Comment By: Don Porter (dgp)
Date: 09/05/01 09:20

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This was unassigned, and perhaps overlooked.  Assigning
to maintainer.  Any ideas on this one?


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