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From:	"Soegtrop, Michael" <michael DOT soegtrop AT intel DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	RE: Unexpected behavior of ~ when calling bash from a different cygwin installation
Date:	Sat, 16 Jun 2018 08:11:28 +0000
Message-ID:	<0F7D3B1B3C4B894D824F5B822E3E5A17788010BF@IRSMSX102.ger.corp.intel.com>
References:	<0F7D3B1B3C4B894D824F5B822E3E5A1778800706 AT IRSMSX102 DOT ger DOT corp DOT intel DOT com> <0F7D3B1B3C4B894D824F5B822E3E5A177880079D AT IRSMSX102 DOT ger DOT corp DOT intel DOT com> <1307619899 DOT 20180616023803 AT yandex DOT ru>
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Dear Andrey,

> The mapping is consistent throughout the execution tree.

I would like to understand the underlying mechanism. The documentation (FAQ section 4.20) states (as far as I understand) that the Windows path of the Cygwin system root an executable sees is the parent directory of the folder in which the cygwin1.dll resides which is loaded by an executable. As I showed, this doesn't seem to be the case. How does it work then? How is the system root folder passed from parent to child?

> At best, nothing will work

Actually if I put cmd in between and clear a few environment variables it works very well in fairly complicated scenarios. Still I would like to understand how the underlying mechanisms work (preferably without reverse engineering).

Best regards,

Michael
Intel Deutschland GmbH
Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de
Managing Directors: Christin Eisenschmid, Christian Lamprechter
Chairperson of the Supervisory Board: Nicole Lau
Registered Office: Munich
Commercial Register: Amtsgericht Muenchen HRB 186928


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