On 9/25/2013 02:24, wynfi...@gmail.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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