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Process command lines for Cygwin processes no longer viewable in Windows task manager as of Cygwin 1.7.21

It seems that process command lines for Cygwin processes are no longer viewable in Windows task manager, SysInternals Process Explorer, or other similar tools. I suspect, but have not verified, that this change occurred with the Cygwin 1.7.21 release. Process command lines do appear as expected for older Cygwin releases (at least 1.7.9-1. Yes, I know that is ancient).

My suspicion that this started with 1.7.21 is based on Corinna's comments in and other anecdotal evidence of new problems occurring as of that release.

I know of at least one other (non-Cygwin) product that is affected by this issue because it relies on the ability to retrieve command lines for Cygwin processes using the (fairly common) technique of querying the Windows Process Environment Block (PEB) and Process Parameters block that is populated when a process is started. The process parameters block includes the process command line and is populated based on the command line supplied to CreateProcess() - which Corinna's comments linked above suggest is now called without command line parameters.


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