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Click here to download plain text source code.

# subroutine name: appenddata
# Appends passed string and newline char ("\n") to specified file
# If error occurs, makes CGI process exit with error
#
# Global variables used:
#    $no_flock - disable flock or not
sub appenddata {
    my($datafile,$row) = @_;

    # If OS (like Win95) desn't support flock, we have to
    # go unreliable and slow way and create "lock" file
    GetFileLock("$datafile.lock");
    my $existed = -e $datafile;
    local *DATA;
    if (open(DATA,">>$datafile")) {
        unless ($no_flock) {
            # Exclusive locking
            flock(DATA, 2) ;
            # In case someone appended while we
            # were waiting, seek to EOF
            seek(DATA, 0, 2);
        }
        print DATA "$row\n";
        # unlock file
        flock(DATA, 8) unless ($no_flock);
        close(DATA);
        chmod(0666, $datafile) unless ($existed);
        ReleaseFileLock("$datafile.lock");
    } else {
        ReleaseFileLock("$datafile.lock");
        die("Error in subroutine appenddata: Can't open $datafile. Reason: $!");
    }
}
 
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