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";