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Date: Mon, 10 Feb 2014 12:49:44 -0700
From: Warren Young <warren@etr-usa.com>
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To: Cygwin-L <cygwin@cygwin.com>
Subject: Re: get rid of getpwent? (Was: cygwin-1.7.28 getpwent header declaration changes ?)
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On 2/10/2014 04:16, Peter Rosin wrote:
> On 2014-02-10 10:02, Warren Young wrote:
>>
>> there *has* to be a better way than strings(1) to extract an EXE's list of DLL imports.
>
> objdump -x /bin/foo.exe

Thank you!

-x turns on 6 other flags, the only one of which that really matters 
here is -p.  The output is complex enough that I decided to write a 
better parser than a grep call.  Here's my new checkfile script:


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


Run it like before, except that it takes the import name to search for 
as a second parameter now:

     $ find /bin -name \*.exe -exec ./checkfile {} getpwent \;

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.

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