use strict;
use warnings;

my $file = 'reqtest.pl';
my $fh;

open $fh, ">$file" or die "Can't create file '$file': $!: $^E\n";
print $fh <<'EOT';
BEGIN {
    print STDERR "Hit CTRL+C now!\n";
    sleep 3;
}
1;
EOT
close $fh;

unshift @INC, sub {
    my($coderef, $filename) = @_;
    return unless $filename eq $file;
    open $fh, $filename or die "Can't read file '$file': $!: $^E\n";
    return $fh;
};

$SIG{INT} = sub {
    print "Caught SIGINT. Terminating.\n";
    if (defined fileno $fh) {
        close $fh or warn "Can't close fh: $!: $^E\n";
    }
    else {
        print STDERR "fh is already closed\n";
    }
    if (-f $file) {
        unlink $file or warn "Can't delete file '$file': $!: $^E\n";
    }
    else {
        print STDERR "file is already deleted (!)\n";
    }
    exit;
};

require $file or die "require() failed\n";

unlink $file or die "Can't delete file '$file': $!: $^E\n";

##</code><code>##

use strict;
use warnings;

my $file = 'reqtest.pl';
my $fh;

open $fh, ">$file" or die "Can't create file '$file': $!: $^E\n";
print $fh "1;\n";
close $fh;

my $sub = sub {
    open $fh, $file or die "Can't open $file: $!: $^E\n";
    print STDERR "Hit CTRL+C now!\n";
    sleep 3;
};

$SIG{INT} = sub {
    print "Caught SIGINT. Terminating.\n";
    if (defined fileno $fh) {
        close $fh or warn "Can't close fh: $!: $^E\n";
    }
    else {
        print STDERR "fh is already closed\n";
    }
    if (-f $file) {
        unlink $file or warn "Can't delete file '$file': $!: $^E\n";
    }
    else {
        print STDERR "file is already deleted (!)\n";
    }
    exit;
};

$sub->();

unlink $file or die "Can't delete file '$file': $!: $^E\n";

##</code><code>##

use strict;
use warnings;

BEGIN {
    if ($^O =~ /MSWin32/io) {
        require Win32API::File;
        Win32API::File->import(qw(GetOsFHandle CloseHandle));
    }
    else {
        no strict 'refs';
        *{GetOsFHandle} = sub {
            use strict 'refs';
            return fileno $_[0];
        };
        *{CloseHandle} = sub {
            use strict 'refs';
            open my $fh, '<&' . $_[0] or return;
            return close $fh;
        };
    }
}

my $file = 'reqtest.pl';
my $osfh;

open my $fh, ">$file" or die "Can't create file '$file': $!: $^E\n";
print $fh <<'EOT';
BEGIN {
    print STDERR "Hit CTRL+C now!\n";
    sleep 3;
}
1;
EOT
close $fh;

unshift @INC, sub {
    my($coderef, $filename) = @_;
    return unless $filename eq $file;
    open my $fh2, $filename or die "Can't read file '$file': $!: $^E\n";
    $osfh = GetOsFHandle($fh2);
    return $fh2;
};

$SIG{INT} = sub {
    print STDERR "Caught SIGINT. Terminating.\n";
    if (defined $osfh) {
        CloseHandle($osfh) or warn "Can't close osfh: $!: $^E\n";
    }
    else {
        print STDERR "osfh is already closed\n";
    }
    if (-f $file) {
        unlink $file or warn "Can't delete file '$file': $!: $^E\n";
    }
    else {
        print STDERR "file is already deleted (!)\n";
    }
    exit;
};

require $file or die "require() failed\n";

unlink $file or die "Can't delete file '$file': $!: $^E\n";

##</code><code>##

use strict;
use warnings;

my $file = 'reqtest.pl';
my $interrupted = 0;

open my $fh, ">$file" or die "Can't create file '$file': $!: $^E\n";
print $fh <<'EOT';
BEGIN {
    print STDERR "Hit CTRL+C now!\n";
    sleep 3;
}
1;
EOT
close $fh;

$SIG{INT} = sub {
    print "Caught SIGINT. Terminating.\n";
    $interrupted = 1;
};

sub handle_sigint {
    if (-f $file) {
        unlink $file or warn "Can't delete file '$file': $!: $^E\n";
    }
    else {
        print STDERR "file is already deleted (!)\n";
    }
    exit;
}

require $file or die "require() failed\n";
handle_sigint() if $interrupted;

unlink $file or die "Can't delete file '$file': $!: $^E\n";