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Date: Fri, 03 Feb 2006 06:19:19 -0700
From: Eric Blake <ebb9 AT byu DOT net>
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To: Amruta <amruta_t25 AT rediffmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: Driftnet for Windows
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Re-adding cygwin mailing list: http://cygwin.com/acronyms/#PPIOSPE

Top-posting reformatted: http://cygwin.com/acronyms/#TOFU

>> I am new to Cygwin. I have a very basic question.
>> There is a tool Driftnet available only for Unix. I want to write it
> for
>> I Windows making a few improvements as a part of my Master's thesis. I
>> am confused here, can cygwin provide me some files like netinet/tcp.h
>> etc. available in Linux (which are used for coding driftnet) in
> Windows?
> 
> Yes, cygwin has <netinet/tcp.h>.  In fact, if you have source code that
> compiles under Linux, it is often the case that the same source code will
> compile under cygwin with minimal tweaking.
> 

According to Amruta on 2/3/2006 12:49 AM:
> But does that mean to run this software everybody will have to download
> cygwin on their machine?

If you compile against cygwin, yes.  There are other projects out there,
such as mingw, which allow native compilation that does not depend on
cygwin1.dll (in fact, cygwin's gcc comes with a -mno-cygwin flag to select
mingw compilation).  However, mingw cannot support as many headers as
cygwin, because it is cygwin doing the translation from POSIX semantics to
windows.  Discussing mingw compilation is somewhat off-topic on this list,
as it more properly belongs on the mingw list.

> Is there any way you can simply keep the required files (say in my case
> netinet/tcp.h) on your system and don't need to keep entire cygwin package.

No - headers are provided by the system for a reason - compiling against
headers means that your program must run on the system that provided those
headers.  Windows doesn't provide <netinet/tcp.h> because Microsoft
doesn't believe in following standards such as POSIX.  Your choices are to
do some heavy porting to what windows actually does provide, or else to
let cygwin do the porting and introduce a dependency on cygwin.

> Basically it doesn't make sense if people have to install 100s of MB of
> files for running the tool.

100s of MB?  I beg to differ.  A minimal cygwin installation is just a few
megabytes; cygwin1.dll itself is currently 1.8 meg (actually, I haven't
done a minimal install lately to see how much really IS installed, maybe
the set of Base packages in cygwin has grown to 100 megabytes by now).
But there is no requirement that you must download every single package
provided at cygwin.com to use cygwin.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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