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Date: Wed, 25 Sep 2013 08:25:52 -0600
From: Warren Young <warren AT etr-usa DOT com>
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To: Cygwin-L <cygwin AT cygwin DOT com>
Subject: Re: Perl and File Locking
References: <20130925172435 DOT 320 AT binki>
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On 9/25/2013 02:24, wynfield AT gmail DOT com wrote:
>
> "Your vendor has not defined Fcntl macro O_EXLOCK,"

O_EXLOCK is a BSD feature, and Cygwin tries to emulate Linux, not BSD.

Minimal testing tells me you can use Cygwin's nonstandard 
F_LCK_MANDATORY feature from Perl.  This script, foo.pl, doesn't die:

     #!/usr/bin/perl
     sysopen my $fh, "foo.pl", 0600, O_RDONLY or die "sysopen: $!\n";
     fcntl $fh, 0x99, 1 or die "fcntl: $!\n";

Whether it actually does what you expect is a different question.

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