Cygwin startup and root directory.

Cygwin startup and root directory.

[Daniel Santos]

Hello,

I see that when you copy Cygwin executables (and dlls) to a random
windows machine and run (for example) bash.exe that Cygwin treats the
parent directory as the root, assigns it an 8-byte serial number and
records it in the user registry.  Can somebody point me to where the
code is that does this?  I presume somewhere under winsup/cygwin?

Also, are there pretty docs somewhere that detail the Cygwin internals,
architecture, etc?  It's making me curious...

Thanks!!
Daniel

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Cygwin startup and root directory.

[Daniel Santos]

Hello,

I see that when you copy Cygwin executables (and dlls) to a random
windows machine and run (for example) bash.exe that Cygwin treats the
parent directory as the root, assigns it an 8-byte serial number and
records it in the user registry.  Can somebody point me to where the
code is that does this?  I presume somewhere under winsup/cygwin?

Also, are there pretty docs somewhere that detail the Cygwin internals,
architecture, etc?  It's making me curious...

Thanks!!
Daniel

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Re: Cygwin startup and root directory.

[Corinna Vinschen]

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On Dec  9 01:12, Daniel Santos wrote:
> Hello,
> 
> I see that when you copy Cygwin executables (and dlls) to a random
> windows machine and run (for example) bash.exe that Cygwin treats the
> parent directory as the root, assigns it an 8-byte serial number and
> records it in the user registry.  Can somebody point me to where the
> code is that does this?  I presume somewhere under winsup/cygwin?

winsup/cygwin/cygheap.cc, method init_cygheap::init_installation_root()

> Also, are there pretty docs somewhere that detail the Cygwin internals,
> architecture, etc?  It's making me curious...

The internals are not overly well documented.  There are a few how* txt
files in winsup/cygwin but they are old and partially outdated.  I try
to write extensive git commit messages and inline comments whenever I
change stuff and also try to convince other contributors to do that,
too.


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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Re: Cygwin startup and root directory.

[Daniel Santos]

Thank you Corinna!  And sorry for the delayed response.

Maybe this is something I can put on my TODO "wish list" -- going
through the Cygwin docs, learning the internals a bit better and maybe
adding to them.  It's always nice to have a nice doc explaining the
high-level architecture and then other docs to "drill down" to the
details on certain areas.  I've always been amazed by what Cygwin does.

Daniel



On 12/9/19 4:22 AM, Corinna Vinschen wrote:
> On Dec  9 01:12, Daniel Santos wrote:
>> Hello,
>>
>> I see that when you copy Cygwin executables (and dlls) to a random
>> windows machine and run (for example) bash.exe that Cygwin treats the
>> parent directory as the root, assigns it an 8-byte serial number and
>> records it in the user registry.  Can somebody point me to where the
>> code is that does this?  I presume somewhere under winsup/cygwin?
> winsup/cygwin/cygheap.cc, method init_cygheap::init_installation_root()
>
>> Also, are there pretty docs somewhere that detail the Cygwin internals,
>> architecture, etc?  It's making me curious...
> The internals are not overly well documented.  There are a few how* txt
> files in winsup/cygwin but they are old and partially outdated.  I try
> to write extensive git commit messages and inline comments whenever I
> change stuff and also try to convince other contributors to do that,
> too.
>
>
> Corinna
>


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