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Click here to download plain text source code.

# subroutine name: getcounter
# Reads content of a counter file and returns an integer.
# If counter file doesn't exist, returns "0".
# If error occurs, makes CGI process exit with error
#
# Global variables used:
#    $no_flock - disable flock or not
sub getcounter {
    my($datafile) = @_;
    my $count=0;
    if (-f $datafile) {
        # If OS (like Win95) desn't support flock, we have to
        # go unreliable and slow way and create "lock" file
        GetFileLock("$datafile.lock");
        if (open (COUNTER, "<$datafile")) {
            # shared locking
            flock(COUNTER, 1) unless ($no_flock);
            $count = int <COUNTER> || 0;
            # unlock file
            flock(COUNTER, 8) unless ($no_flock);
            close(COUNTER);
            ReleaseFileLock("$datafile.lock");
        } else {
              ReleaseFileLock("$datafile.lock");
            die("Error in subroutine getcounter: Can't open $datafile. Reason: $!");
        }
    };
    return $count;
}
 
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