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Message-ID: <52FAB14C.8060800@tiscali.co.uk>
Date: Tue, 11 Feb 2014 23:25:00 +0000
From: David Stacey <drstacey@tiscali.co.uk>
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To: cygwin@cygwin.com
Subject: Re: get rid of getpwent? (Was: cygwin-1.7.28 getpwent header declaration changes ?)
References: <52F339CA.5070305@gmail.com> <20140206090117.GD2821@calimero.vinschen.de> <52F361C5.3000807@gmail.com> <20140206141321.GI2821@calimero.vinschen.de> <52F40208.5030901@etr-usa.com> <20140207094917.GN2821@calimero.vinschen.de> <52F4E540.2010606@tiscali.co.uk> <52F51D19.6080807@etr-usa.com> <31347914-BB4F-4039-984B-731B6C72F903@etr-usa.com> <52F7AEC5.5090205@tiscali.co.uk> <8B7B5FE0-7413-4358-BA8A-E0B6E0B17653@etr-usa.com> <52F8B50E.7040307@lysator.liu.se> <52F92D58.9030408@etr-usa.com> <52F95D1D.4050108@tiscali.co.uk> <4510121021.20140211062515@mtu-net.ru>
In-Reply-To: <4510121021.20140211062515@mtu-net.ru>
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On 11/02/2014 02:25, Andrey Repin wrote:
> Greetings, David Stacey!

Greetings, Andrey Repin! (I've wanted to type that for such a long time...)

>
>>>   I don't have my "almost everything" Cygwin install here to run it
>>>   against, so unless someone beats me to it, I won't be posting results
>>>   for many hours at least.
>>   Delighted to oblige. I ran your perl script on all executables and DLLs
>>   in /bin. Results attached.
> Curious that mc is missing from 32-bit list.

You are quite correct. I've looked at the source code for Midnight 
Commander, and getpwent() is called in three different places. The 
problem was an assumption made in the 'checkfile' perl script: it was 
assumed that cygwin1.dll is the first DLL listed by objdump. For mc.exe, 
this isn't the case - cyggcc_s-1.dll is listed first, with cygwin1.dll 
second.

I made a quick amendment to said perl script to cater for this, and the 
new results are attached. The differences between the two lists are 
mainly due to packages not being available for 64-bit Cygwin (e.g. 
xemacs, ytree). Guile is worthy of a mention: cygguile-12.dll is in the 
32-bit list, but there is no equivalent in the 64-bit list. This is 
probably because the 64-bit version of guile is at a later version 
compared to its 32-bit cousin.

Hopefully third time lucky!

Dave.

PS: For reference, the revised perl script is as follows:

#!/usr/bin/perl -w

my ($exe, $symbol) = @ARGV;
my $in_cygdll = 0;

die "usage: $0 exename symbol\n" unless length($symbol);
open my $dump, '-|', "objdump -p '$exe'" or die "Can't dump $exe: $!\n";

while (<$dump>) {
     if (m/DLL Name: cygwin1.dll/) {
         $in_cygdll = 1;
     }
     elsif (m/DLL Name: /) {
         if ($in_cygdll) {
             last;   # Last cygwin1.dll symbol found; on to another DLL
         }
     }
     elsif ($in_cygdll) {
         my @parts = split;
         if (@parts == 3 and $parts[2] eq $symbol) {
             print "$exe\n";
             last;
         }
     }
}


--------------010105040203070304070908
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/bin/ali.exe
/bin/emacs-nox.exe
/bin/emacs-w32.exe
/bin/emacs-X11.exe
/bin/fish.exe
/bin/gdb.exe
/bin/gvim.exe
/bin/joe.exe
/bin/lefty.exe
/bin/mc.exe
/bin/nano.exe
/bin/otp.exe
/bin/pure-pwconvert.exe
/bin/tcsh.exe
/bin/vim.exe
/bin/xdvi-xaw.exe
/bin/xemacs-21.4.22.exe
/bin/ytree.exe
/bin/cygedit-0.dll
/bin/cyggtk-1-2-0.dll
/bin/cyggtk-x11-2.0-0.dll
/bin/cygguile-12.dll
/bin/cygguile-17.dll
/bin/cyggutils-1.dll
/bin/cygoctave-1.dll
/bin/cygperl5_14.dll
/bin/cygreadline5.dll
/bin/cygreadline6.dll
/bin/cygreadline7.dll
/bin/libpython2.7.dll
/bin/libpython3.2m.dll
/bin/libzsh-5.0.2.dll

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/bin/ali.exe
/bin/emacs-nox.exe
/bin/emacs-w32.exe
/bin/emacs-X11.exe
/bin/fish.exe
/bin/gdb.exe
/bin/gvim.exe
/bin/joe.exe
/bin/lefty.exe
/bin/mc.exe
/bin/nano.exe
/bin/otp.exe
/bin/tcsh.exe
/bin/vim.exe
/bin/xdvi-xaw.exe
/bin/cygedit-0.dll
/bin/cyggtk-1-2-0.dll
/bin/cyggtk-x11-2.0-0.dll
/bin/cygguile-17.dll
/bin/cyggutils-1.dll
/bin/cygoctave-1.dll
/bin/cygperl5_14.dll
/bin/cygreadline7.dll
/bin/libpython2.7.dll
/bin/libpython3.2m.dll
/bin/libzsh-5.0.2.dll


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